pragma solidity ^0.4.16;
//import "github.com/oraclize/ethereum-api/oraclizeAPI.sol";
// <ORACLIZE_API>
/*
Copyright (c) 2015-2016 Oraclize SRL
Copyright (c) 2016 Oraclize LTD



Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:



The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.



THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

pragma solidity ^0.4.0;//please import oraclizeAPI_pre0.4.sol when solidity < 0.4.0

contract OraclizeI {
    address public cbAddress;
    function query(uint _timestamp, string _datasource, string _arg) payable returns (bytes32 _id);
    function query_withGasLimit(uint _timestamp, string _datasource, string _arg, uint _gaslimit) payable returns (bytes32 _id);
    function query2(uint _timestamp, string _datasource, string _arg1, string _arg2) payable returns (bytes32 _id);
    function query2_withGasLimit(uint _timestamp, string _datasource, string _arg1, string _arg2, uint _gaslimit) payable returns (bytes32 _id);
    function queryN(uint _timestamp, string _datasource, bytes _argN) payable returns (bytes32 _id);
    function queryN_withGasLimit(uint _timestamp, string _datasource, bytes _argN, uint _gaslimit) payable returns (bytes32 _id);
    function getPrice(string _datasource) returns (uint _dsprice);
    function getPrice(string _datasource, uint gaslimit) returns (uint _dsprice);
    function useCoupon(string _coupon);
    function setProofType(byte _proofType);
    function setConfig(bytes32 _config);
    function setCustomGasPrice(uint _gasPrice);
    function randomDS_getSessionPubKeyHash() returns(bytes32);
}
contract OraclizeAddrResolverI {
    function getAddress() returns (address _addr);
}
contract usingOraclize {
    uint constant day = 60*60*24;
    uint constant week = 60*60*24*7;
    uint constant month = 60*60*24*30;
    byte constant proofType_NONE = 0x00;
    byte constant proofType_TLSNotary = 0x10;
    byte constant proofType_Android = 0x20;
    byte constant proofType_Ledger = 0x30;
    byte constant proofType_Native = 0xF0;
    byte constant proofStorage_IPFS = 0x01;
    uint8 constant networkID_auto = 0;
    uint8 constant networkID_mainnet = 1;
    uint8 constant networkID_testnet = 2;
    uint8 constant networkID_morden = 2;
    uint8 constant networkID_consensys = 161;

    OraclizeAddrResolverI OAR;

    OraclizeI oraclize;
    modifier oraclizeAPI {
        if((address(OAR)==0)||(getCodeSize(address(OAR))==0))
            oraclize_setNetwork(networkID_auto);

        if(address(oraclize) != OAR.getAddress())
            oraclize = OraclizeI(OAR.getAddress());

        _;
    }
    modifier coupon(string code){
        oraclize = OraclizeI(OAR.getAddress());
        oraclize.useCoupon(code);
        _;
    }

    function oraclize_setNetwork(uint8 networkID) internal returns(bool){
        if (getCodeSize(0x1d3B2638a7cC9f2CB3D298A3DA7a90B67E5506ed)>0){ //mainnet
            OAR = OraclizeAddrResolverI(0x1d3B2638a7cC9f2CB3D298A3DA7a90B67E5506ed);
            oraclize_setNetworkName("eth_mainnet");
            return true;
        }
        if (getCodeSize(0xc03A2615D5efaf5F49F60B7BB6583eaec212fdf1)>0){ //ropsten testnet
            OAR = OraclizeAddrResolverI(0xc03A2615D5efaf5F49F60B7BB6583eaec212fdf1);
            oraclize_setNetworkName("eth_ropsten3");
            return true;
        }
        if (getCodeSize(0xB7A07BcF2Ba2f2703b24C0691b5278999C59AC7e)>0){ //kovan testnet
            OAR = OraclizeAddrResolverI(0xB7A07BcF2Ba2f2703b24C0691b5278999C59AC7e);
            oraclize_setNetworkName("eth_kovan");
            return true;
        }
        if (getCodeSize(0x146500cfd35B22E4A392Fe0aDc06De1a1368Ed48)>0){ //rinkeby testnet
            OAR = OraclizeAddrResolverI(0x146500cfd35B22E4A392Fe0aDc06De1a1368Ed48);
            oraclize_setNetworkName("eth_rinkeby");
            return true;
        }
        if (getCodeSize(0x6f485C8BF6fc43eA212E93BBF8ce046C7f1cb475)>0){ //ethereum-bridge
            OAR = OraclizeAddrResolverI(0x6f485C8BF6fc43eA212E93BBF8ce046C7f1cb475);
            return true;
        }
        if (getCodeSize(0x20e12A1F859B3FeaE5Fb2A0A32C18F5a65555bBF)>0){ //ether.camp ide
            OAR = OraclizeAddrResolverI(0x20e12A1F859B3FeaE5Fb2A0A32C18F5a65555bBF);
            return true;
        }
        if (getCodeSize(0x51efaF4c8B3C9AfBD5aB9F4bbC82784Ab6ef8fAA)>0){ //browser-solidity
            OAR = OraclizeAddrResolverI(0x51efaF4c8B3C9AfBD5aB9F4bbC82784Ab6ef8fAA);
            return true;
        }
        return false;
    }

    function __callback(bytes32 myid, string result) {
        __callback(myid, result, new bytes(0));
    }
    function __callback(bytes32 myid, string result, bytes proof) {
    }

    function oraclize_useCoupon(string code) oraclizeAPI internal {
        oraclize.useCoupon(code);
    }

    function oraclize_getPrice(string datasource) oraclizeAPI internal returns (uint){
        return oraclize.getPrice(datasource);
    }

    function oraclize_getPrice(string datasource, uint gaslimit) oraclizeAPI internal returns (uint){
        return oraclize.getPrice(datasource, gaslimit);
    }

    function oraclize_query(string datasource, string arg) oraclizeAPI internal returns (bytes32 id){
        uint price = oraclize.getPrice(datasource);
        if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
        return oraclize.query.value(price)(0, datasource, arg);
    }
    function oraclize_query(uint timestamp, string datasource, string arg) oraclizeAPI internal returns (bytes32 id){
        uint price = oraclize.getPrice(datasource);
        if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
        return oraclize.query.value(price)(timestamp, datasource, arg);
    }
    function oraclize_query(uint timestamp, string datasource, string arg, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
        uint price = oraclize.getPrice(datasource, gaslimit);
        if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
        return oraclize.query_withGasLimit.value(price)(timestamp, datasource, arg, gaslimit);
    }
    function oraclize_query(string datasource, string arg, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
        uint price = oraclize.getPrice(datasource, gaslimit);
        if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
        return oraclize.query_withGasLimit.value(price)(0, datasource, arg, gaslimit);
    }
    function oraclize_query(string datasource, string arg1, string arg2) oraclizeAPI internal returns (bytes32 id){
        uint price = oraclize.getPrice(datasource);
        if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
        return oraclize.query2.value(price)(0, datasource, arg1, arg2);
    }
    function oraclize_query(uint timestamp, string datasource, string arg1, string arg2) oraclizeAPI internal returns (bytes32 id){
        uint price = oraclize.getPrice(datasource);
        if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
        return oraclize.query2.value(price)(timestamp, datasource, arg1, arg2);
    }
    function oraclize_query(uint timestamp, string datasource, string arg1, string arg2, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
        uint price = oraclize.getPrice(datasource, gaslimit);
        if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
        return oraclize.query2_withGasLimit.value(price)(timestamp, datasource, arg1, arg2, gaslimit);
    }
    function oraclize_query(string datasource, string arg1, string arg2, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
        uint price = oraclize.getPrice(datasource, gaslimit);
        if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
        return oraclize.query2_withGasLimit.value(price)(0, datasource, arg1, arg2, gaslimit);
    }
    function oraclize_query(string datasource, string[] argN) oraclizeAPI internal returns (bytes32 id){
        uint price = oraclize.getPrice(datasource);
        if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
        bytes memory args = stra2cbor(argN);
        return oraclize.queryN.value(price)(0, datasource, args);
    }
    function oraclize_query(uint timestamp, string datasource, string[] argN) oraclizeAPI internal returns (bytes32 id){
        uint price = oraclize.getPrice(datasource);
        if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
        bytes memory args = stra2cbor(argN);
        return oraclize.queryN.value(price)(timestamp, datasource, args);
    }
    function oraclize_query(uint timestamp, string datasource, string[] argN, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
        uint price = oraclize.getPrice(datasource, gaslimit);
        if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
        bytes memory args = stra2cbor(argN);
        return oraclize.queryN_withGasLimit.value(price)(timestamp, datasource, args, gaslimit);
    }
    function oraclize_query(string datasource, string[] argN, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
        uint price = oraclize.getPrice(datasource, gaslimit);
        if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
        bytes memory args = stra2cbor(argN);
        return oraclize.queryN_withGasLimit.value(price)(0, datasource, args, gaslimit);
    }
    function oraclize_query(string datasource, string[1] args) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](1);
        dynargs[0] = args[0];
        return oraclize_query(datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, string[1] args) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](1);
        dynargs[0] = args[0];
        return oraclize_query(timestamp, datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, string[1] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](1);
        dynargs[0] = args[0];
        return oraclize_query(timestamp, datasource, dynargs, gaslimit);
    }
    function oraclize_query(string datasource, string[1] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](1);
        dynargs[0] = args[0];
        return oraclize_query(datasource, dynargs, gaslimit);
    }

    function oraclize_query(string datasource, string[2] args) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](2);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        return oraclize_query(datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, string[2] args) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](2);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        return oraclize_query(timestamp, datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, string[2] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](2);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        return oraclize_query(timestamp, datasource, dynargs, gaslimit);
    }
    function oraclize_query(string datasource, string[2] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](2);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        return oraclize_query(datasource, dynargs, gaslimit);
    }
    function oraclize_query(string datasource, string[3] args) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](3);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        return oraclize_query(datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, string[3] args) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](3);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        return oraclize_query(timestamp, datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, string[3] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](3);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        return oraclize_query(timestamp, datasource, dynargs, gaslimit);
    }
    function oraclize_query(string datasource, string[3] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](3);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        return oraclize_query(datasource, dynargs, gaslimit);
    }

    function oraclize_query(string datasource, string[4] args) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](4);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        dynargs[3] = args[3];
        return oraclize_query(datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, string[4] args) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](4);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        dynargs[3] = args[3];
        return oraclize_query(timestamp, datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, string[4] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](4);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        dynargs[3] = args[3];
        return oraclize_query(timestamp, datasource, dynargs, gaslimit);
    }
    function oraclize_query(string datasource, string[4] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](4);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        dynargs[3] = args[3];
        return oraclize_query(datasource, dynargs, gaslimit);
    }
    function oraclize_query(string datasource, string[5] args) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](5);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        dynargs[3] = args[3];
        dynargs[4] = args[4];
        return oraclize_query(datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, string[5] args) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](5);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        dynargs[3] = args[3];
        dynargs[4] = args[4];
        return oraclize_query(timestamp, datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, string[5] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](5);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        dynargs[3] = args[3];
        dynargs[4] = args[4];
        return oraclize_query(timestamp, datasource, dynargs, gaslimit);
    }
    function oraclize_query(string datasource, string[5] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        string[] memory dynargs = new string[](5);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        dynargs[3] = args[3];
        dynargs[4] = args[4];
        return oraclize_query(datasource, dynargs, gaslimit);
    }
    function oraclize_query(string datasource, bytes[] argN) oraclizeAPI internal returns (bytes32 id){
        uint price = oraclize.getPrice(datasource);
        if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
        bytes memory args = ba2cbor(argN);
        return oraclize.queryN.value(price)(0, datasource, args);
    }
    function oraclize_query(uint timestamp, string datasource, bytes[] argN) oraclizeAPI internal returns (bytes32 id){
        uint price = oraclize.getPrice(datasource);
        if (price > 1 ether + tx.gasprice*200000) return 0; // unexpectedly high price
        bytes memory args = ba2cbor(argN);
        return oraclize.queryN.value(price)(timestamp, datasource, args);
    }
    function oraclize_query(uint timestamp, string datasource, bytes[] argN, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
        uint price = oraclize.getPrice(datasource, gaslimit);
        if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
        bytes memory args = ba2cbor(argN);
        return oraclize.queryN_withGasLimit.value(price)(timestamp, datasource, args, gaslimit);
    }
    function oraclize_query(string datasource, bytes[] argN, uint gaslimit) oraclizeAPI internal returns (bytes32 id){
        uint price = oraclize.getPrice(datasource, gaslimit);
        if (price > 1 ether + tx.gasprice*gaslimit) return 0; // unexpectedly high price
        bytes memory args = ba2cbor(argN);
        return oraclize.queryN_withGasLimit.value(price)(0, datasource, args, gaslimit);
    }
    function oraclize_query(string datasource, bytes[1] args) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](1);
        dynargs[0] = args[0];
        return oraclize_query(datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, bytes[1] args) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](1);
        dynargs[0] = args[0];
        return oraclize_query(timestamp, datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, bytes[1] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](1);
        dynargs[0] = args[0];
        return oraclize_query(timestamp, datasource, dynargs, gaslimit);
    }
    function oraclize_query(string datasource, bytes[1] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](1);
        dynargs[0] = args[0];
        return oraclize_query(datasource, dynargs, gaslimit);
    }

    function oraclize_query(string datasource, bytes[2] args) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](2);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        return oraclize_query(datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, bytes[2] args) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](2);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        return oraclize_query(timestamp, datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, bytes[2] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](2);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        return oraclize_query(timestamp, datasource, dynargs, gaslimit);
    }
    function oraclize_query(string datasource, bytes[2] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](2);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        return oraclize_query(datasource, dynargs, gaslimit);
    }
    function oraclize_query(string datasource, bytes[3] args) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](3);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        return oraclize_query(datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, bytes[3] args) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](3);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        return oraclize_query(timestamp, datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, bytes[3] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](3);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        return oraclize_query(timestamp, datasource, dynargs, gaslimit);
    }
    function oraclize_query(string datasource, bytes[3] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](3);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        return oraclize_query(datasource, dynargs, gaslimit);
    }

    function oraclize_query(string datasource, bytes[4] args) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](4);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        dynargs[3] = args[3];
        return oraclize_query(datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, bytes[4] args) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](4);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        dynargs[3] = args[3];
        return oraclize_query(timestamp, datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, bytes[4] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](4);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        dynargs[3] = args[3];
        return oraclize_query(timestamp, datasource, dynargs, gaslimit);
    }
    function oraclize_query(string datasource, bytes[4] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](4);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        dynargs[3] = args[3];
        return oraclize_query(datasource, dynargs, gaslimit);
    }
    function oraclize_query(string datasource, bytes[5] args) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](5);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        dynargs[3] = args[3];
        dynargs[4] = args[4];
        return oraclize_query(datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, bytes[5] args) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](5);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        dynargs[3] = args[3];
        dynargs[4] = args[4];
        return oraclize_query(timestamp, datasource, dynargs);
    }
    function oraclize_query(uint timestamp, string datasource, bytes[5] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](5);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        dynargs[3] = args[3];
        dynargs[4] = args[4];
        return oraclize_query(timestamp, datasource, dynargs, gaslimit);
    }
    function oraclize_query(string datasource, bytes[5] args, uint gaslimit) oraclizeAPI internal returns (bytes32 id) {
        bytes[] memory dynargs = new bytes[](5);
        dynargs[0] = args[0];
        dynargs[1] = args[1];
        dynargs[2] = args[2];
        dynargs[3] = args[3];
        dynargs[4] = args[4];
        return oraclize_query(datasource, dynargs, gaslimit);
    }

    function oraclize_cbAddress() oraclizeAPI internal returns (address){
        return oraclize.cbAddress();
    }
    function oraclize_setProof(byte proofP) oraclizeAPI internal {
        return oraclize.setProofType(proofP);
    }
    function oraclize_setCustomGasPrice(uint gasPrice) oraclizeAPI internal {
        return oraclize.setCustomGasPrice(gasPrice);
    }
    function oraclize_setConfig(bytes32 config) oraclizeAPI internal {
        return oraclize.setConfig(config);
    }

    function oraclize_randomDS_getSessionPubKeyHash() oraclizeAPI internal returns (bytes32){
        return oraclize.randomDS_getSessionPubKeyHash();
    }

    function getCodeSize(address _addr) constant internal returns(uint _size) {
        assembly {
            _size := extcodesize(_addr)
        }
    }

    function parseAddr(string _a) internal returns (address){
        bytes memory tmp = bytes(_a);
        uint160 iaddr = 0;
        uint160 b1;
        uint160 b2;
        for (uint i=2; i<2+2*20; i+=2){
            iaddr *= 256;
            b1 = uint160(tmp[i]);
            b2 = uint160(tmp[i+1]);
            if ((b1 >= 97)&&(b1 <= 102)) b1 -= 87;
            else if ((b1 >= 65)&&(b1 <= 70)) b1 -= 55;
            else if ((b1 >= 48)&&(b1 <= 57)) b1 -= 48;
            if ((b2 >= 97)&&(b2 <= 102)) b2 -= 87;
            else if ((b2 >= 65)&&(b2 <= 70)) b2 -= 55;
            else if ((b2 >= 48)&&(b2 <= 57)) b2 -= 48;
            iaddr += (b1*16+b2);
        }
        return address(iaddr);
    }

    function strCompare(string _a, string _b) internal returns (int) {
        bytes memory a = bytes(_a);
        bytes memory b = bytes(_b);
        uint minLength = a.length;
        if (b.length < minLength) minLength = b.length;
        for (uint i = 0; i < minLength; i ++)
            if (a[i] < b[i])
                return -1;
            else if (a[i] > b[i])
                return 1;
        if (a.length < b.length)
            return -1;
        else if (a.length > b.length)
            return 1;
        else
            return 0;
    }

    function indexOf(string _haystack, string _needle) internal returns (int) {
        bytes memory h = bytes(_haystack);
        bytes memory n = bytes(_needle);
        if(h.length < 1 || n.length < 1 || (n.length > h.length))
            return -1;
        else if(h.length > (2**128 -1))
            return -1;
        else
        {
            uint subindex = 0;
            for (uint i = 0; i < h.length; i ++)
            {
                if (h[i] == n[0])
                {
                    subindex = 1;
                    while(subindex < n.length && (i + subindex) < h.length && h[i + subindex] == n[subindex])
                    {
                        subindex++;
                    }
                    if(subindex == n.length)
                        return int(i);
                }
            }
            return -1;
        }
    }

    function strConcat(string _a, string _b, string _c, string _d, string _e) internal returns (string) {
        bytes memory _ba = bytes(_a);
        bytes memory _bb = bytes(_b);
        bytes memory _bc = bytes(_c);
        bytes memory _bd = bytes(_d);
        bytes memory _be = bytes(_e);
        string memory abcde = new string(_ba.length + _bb.length + _bc.length + _bd.length + _be.length);
        bytes memory babcde = bytes(abcde);
        uint k = 0;
        for (uint i = 0; i < _ba.length; i++) babcde[k++] = _ba[i];
        for (i = 0; i < _bb.length; i++) babcde[k++] = _bb[i];
        for (i = 0; i < _bc.length; i++) babcde[k++] = _bc[i];
        for (i = 0; i < _bd.length; i++) babcde[k++] = _bd[i];
        for (i = 0; i < _be.length; i++) babcde[k++] = _be[i];
        return string(babcde);
    }

    function strConcat(string _a, string _b, string _c, string _d) internal returns (string) {
        return strConcat(_a, _b, _c, _d, "");
    }

    function strConcat(string _a, string _b, string _c) internal returns (string) {
        return strConcat(_a, _b, _c, "", "");
    }

    function strConcat(string _a, string _b) internal returns (string) {
        return strConcat(_a, _b, "", "", "");
    }

    // parseInt
    function parseInt(string _a) internal returns (uint) {
        return parseInt(_a, 0);
    }

    // parseInt(parseFloat*10^_b)
    function parseInt(string _a, uint _b) internal returns (uint) {
        bytes memory bresult = bytes(_a);
        uint mint = 0;
        bool decimals = false;
        for (uint i=0; i<bresult.length; i++){
            if ((bresult[i] >= 48)&&(bresult[i] <= 57)){
                if (decimals){
                   if (_b == 0) break;
                    else _b--;
                }
                mint *= 10;
                mint += uint(bresult[i]) - 48;
            } else if (bresult[i] == 46) decimals = true;
        }
        if (_b > 0) mint *= 10**_b;
        return mint;
    }

    function uint2str(uint i) internal returns (string){
        if (i == 0) return "0";
        uint j = i;
        uint len;
        while (j != 0){
            len++;
            j /= 10;
        }
        bytes memory bstr = new bytes(len);
        uint k = len - 1;
        while (i != 0){
            bstr[k--] = byte(48 + i % 10);
            i /= 10;
        }
        return string(bstr);
    }

    function stra2cbor(string[] arr) internal returns (bytes) {
            uint arrlen = arr.length;

            // get correct cbor output length
            uint outputlen = 0;
            bytes[] memory elemArray = new bytes[](arrlen);
            for (uint i = 0; i < arrlen; i++) {
                elemArray[i] = (bytes(arr[i]));
                outputlen += elemArray[i].length + (elemArray[i].length - 1)/23 + 3; //+3 accounts for paired identifier types
            }
            uint ctr = 0;
            uint cborlen = arrlen + 0x80;
            outputlen += byte(cborlen).length;
            bytes memory res = new bytes(outputlen);

            while (byte(cborlen).length > ctr) {
                res[ctr] = byte(cborlen)[ctr];
                ctr++;
            }
            for (i = 0; i < arrlen; i++) {
                res[ctr] = 0x5F;
                ctr++;
                for (uint x = 0; x < elemArray[i].length; x++) {
                    // if there's a bug with larger strings, this may be the culprit
                    if (x % 23 == 0) {
                        uint elemcborlen = elemArray[i].length - x >= 24 ? 23 : elemArray[i].length - x;
                        elemcborlen += 0x40;
                        uint lctr = ctr;
                        while (byte(elemcborlen).length > ctr - lctr) {
                            res[ctr] = byte(elemcborlen)[ctr - lctr];
                            ctr++;
                        }
                    }
                    res[ctr] = elemArray[i][x];
                    ctr++;
                }
                res[ctr] = 0xFF;
                ctr++;
            }
            return res;
        }

    function ba2cbor(bytes[] arr) internal returns (bytes) {
            uint arrlen = arr.length;

            // get correct cbor output length
            uint outputlen = 0;
            bytes[] memory elemArray = new bytes[](arrlen);
            for (uint i = 0; i < arrlen; i++) {
                elemArray[i] = (bytes(arr[i]));
                outputlen += elemArray[i].length + (elemArray[i].length - 1)/23 + 3; //+3 accounts for paired identifier types
            }
            uint ctr = 0;
            uint cborlen = arrlen + 0x80;
            outputlen += byte(cborlen).length;
            bytes memory res = new bytes(outputlen);

            while (byte(cborlen).length > ctr) {
                res[ctr] = byte(cborlen)[ctr];
                ctr++;
            }
            for (i = 0; i < arrlen; i++) {
                res[ctr] = 0x5F;
                ctr++;
                for (uint x = 0; x < elemArray[i].length; x++) {
                    // if there's a bug with larger strings, this may be the culprit
                    if (x % 23 == 0) {
                        uint elemcborlen = elemArray[i].length - x >= 24 ? 23 : elemArray[i].length - x;
                        elemcborlen += 0x40;
                        uint lctr = ctr;
                        while (byte(elemcborlen).length > ctr - lctr) {
                            res[ctr] = byte(elemcborlen)[ctr - lctr];
                            ctr++;
                        }
                    }
                    res[ctr] = elemArray[i][x];
                    ctr++;
                }
                res[ctr] = 0xFF;
                ctr++;
            }
            return res;
        }


    string oraclize_network_name;
    function oraclize_setNetworkName(string _network_name) internal {
        oraclize_network_name = _network_name;
    }

    function oraclize_getNetworkName() internal returns (string) {
        return oraclize_network_name;
    }

    function oraclize_newRandomDSQuery(uint _delay, uint _nbytes, uint _customGasLimit) internal returns (bytes32){
        if ((_nbytes == 0)||(_nbytes > 32)) throw;
        bytes memory nbytes = new bytes(1);
        nbytes[0] = byte(_nbytes);
        bytes memory unonce = new bytes(32);
        bytes memory sessionKeyHash = new bytes(32);
        bytes32 sessionKeyHash_bytes32 = oraclize_randomDS_getSessionPubKeyHash();
        assembly {
            mstore(unonce, 0x20)
            mstore(add(unonce, 0x20), xor(blockhash(sub(number, 1)), xor(coinbase, timestamp)))
            mstore(sessionKeyHash, 0x20)
            mstore(add(sessionKeyHash, 0x20), sessionKeyHash_bytes32)
        }
        bytes[3] memory args = [unonce, nbytes, sessionKeyHash];
        bytes32 queryId = oraclize_query(_delay, "random", args, _customGasLimit);
        oraclize_randomDS_setCommitment(queryId, sha3(bytes8(_delay), args[1], sha256(args[0]), args[2]));
        return queryId;
    }

    function oraclize_randomDS_setCommitment(bytes32 queryId, bytes32 commitment) internal {
        oraclize_randomDS_args[queryId] = commitment;
    }

    mapping(bytes32=>bytes32) oraclize_randomDS_args;
    mapping(bytes32=>bool) oraclize_randomDS_sessionKeysHashVerified;

    function verifySig(bytes32 tosignh, bytes dersig, bytes pubkey) internal returns (bool){
        bool sigok;
        address signer;

        bytes32 sigr;
        bytes32 sigs;

        bytes memory sigr_ = new bytes(32);
        uint offset = 4+(uint(dersig[3]) - 0x20);
        sigr_ = copyBytes(dersig, offset, 32, sigr_, 0);
        bytes memory sigs_ = new bytes(32);
        offset += 32 + 2;
        sigs_ = copyBytes(dersig, offset+(uint(dersig[offset-1]) - 0x20), 32, sigs_, 0);

        assembly {
            sigr := mload(add(sigr_, 32))
            sigs := mload(add(sigs_, 32))
        }


        (sigok, signer) = safer_ecrecover(tosignh, 27, sigr, sigs);
        if (address(sha3(pubkey)) == signer) return true;
        else {
            (sigok, signer) = safer_ecrecover(tosignh, 28, sigr, sigs);
            return (address(sha3(pubkey)) == signer);
        }
    }

    function oraclize_randomDS_proofVerify__sessionKeyValidity(bytes proof, uint sig2offset) internal returns (bool) {
        bool sigok;

        // Step 6: verify the attestation signature, APPKEY1 must sign the sessionKey from the correct ledger app (CODEHASH)
        bytes memory sig2 = new bytes(uint(proof[sig2offset+1])+2);
        copyBytes(proof, sig2offset, sig2.length, sig2, 0);

        bytes memory appkey1_pubkey = new bytes(64);
        copyBytes(proof, 3+1, 64, appkey1_pubkey, 0);

        bytes memory tosign2 = new bytes(1+65+32);
        tosign2[0] = 1; //role
        copyBytes(proof, sig2offset-65, 65, tosign2, 1);
        bytes memory CODEHASH = hex"fd94fa71bc0ba10d39d464d0d8f465efeef0a2764e3887fcc9df41ded20f505c";
        copyBytes(CODEHASH, 0, 32, tosign2, 1+65);
        sigok = verifySig(sha256(tosign2), sig2, appkey1_pubkey);

        if (sigok == false) return false;


        // Step 7: verify the APPKEY1 provenance (must be signed by Ledger)
        bytes memory LEDGERKEY = hex"7fb956469c5c9b89840d55b43537e66a98dd4811ea0a27224272c2e5622911e8537a2f8e86a46baec82864e98dd01e9ccc2f8bc5dfc9cbe5a91a290498dd96e4";

        bytes memory tosign3 = new bytes(1+65);
        tosign3[0] = 0xFE;
        copyBytes(proof, 3, 65, tosign3, 1);

        bytes memory sig3 = new bytes(uint(proof[3+65+1])+2);
        copyBytes(proof, 3+65, sig3.length, sig3, 0);

        sigok = verifySig(sha256(tosign3), sig3, LEDGERKEY);

        return sigok;
    }

    modifier oraclize_randomDS_proofVerify(bytes32 _queryId, string _result, bytes _proof) {
        // Step 1: the prefix has to match 'LP\x01' (Ledger Proof version 1)
        if ((_proof[0] != "L")||(_proof[1] != "P")||(_proof[2] != 1)) throw;

        bool proofVerified = oraclize_randomDS_proofVerify__main(_proof, _queryId, bytes(_result), oraclize_getNetworkName());
        if (proofVerified == false) throw;

        _;
    }

    function oraclize_randomDS_proofVerify__returnCode(bytes32 _queryId, string _result, bytes _proof) internal returns (uint8){
        // Step 1: the prefix has to match 'LP\x01' (Ledger Proof version 1)
        if ((_proof[0] != "L")||(_proof[1] != "P")||(_proof[2] != 1)) return 1;

        bool proofVerified = oraclize_randomDS_proofVerify__main(_proof, _queryId, bytes(_result), oraclize_getNetworkName());
        if (proofVerified == false) return 2;

        return 0;
    }

    function matchBytes32Prefix(bytes32 content, bytes prefix, uint n_random_bytes) internal returns (bool){
        bool match_ = true;
        
        for (uint256 i=0; i< n_random_bytes; i++) {
            if (content[i] != prefix[i]) match_ = false;
        }

        return match_;
    }

    function oraclize_randomDS_proofVerify__main(bytes proof, bytes32 queryId, bytes result, string context_name) internal returns (bool){

        // Step 2: the unique keyhash has to match with the sha256 of (context name + queryId)
        uint ledgerProofLength = 3+65+(uint(proof[3+65+1])+2)+32;
        bytes memory keyhash = new bytes(32);
        copyBytes(proof, ledgerProofLength, 32, keyhash, 0);
        if (!(sha3(keyhash) == sha3(sha256(context_name, queryId)))) return false;

        bytes memory sig1 = new bytes(uint(proof[ledgerProofLength+(32+8+1+32)+1])+2);
        copyBytes(proof, ledgerProofLength+(32+8+1+32), sig1.length, sig1, 0);

        // Step 3: we assume sig1 is valid (it will be verified during step 5) and we verify if 'result' is the prefix of sha256(sig1)
        if (!matchBytes32Prefix(sha256(sig1), result, uint(proof[ledgerProofLength+32+8]))) return false;

        // Step 4: commitment match verification, sha3(delay, nbytes, unonce, sessionKeyHash) == commitment in storage.
        // This is to verify that the computed args match with the ones specified in the query.
        bytes memory commitmentSlice1 = new bytes(8+1+32);
        copyBytes(proof, ledgerProofLength+32, 8+1+32, commitmentSlice1, 0);

        bytes memory sessionPubkey = new bytes(64);
        uint sig2offset = ledgerProofLength+32+(8+1+32)+sig1.length+65;
        copyBytes(proof, sig2offset-64, 64, sessionPubkey, 0);

        bytes32 sessionPubkeyHash = sha256(sessionPubkey);
        if (oraclize_randomDS_args[queryId] == sha3(commitmentSlice1, sessionPubkeyHash)){ //unonce, nbytes and sessionKeyHash match
            delete oraclize_randomDS_args[queryId];
        } else return false;


        // Step 5: validity verification for sig1 (keyhash and args signed with the sessionKey)
        bytes memory tosign1 = new bytes(32+8+1+32);
        copyBytes(proof, ledgerProofLength, 32+8+1+32, tosign1, 0);
        if (!verifySig(sha256(tosign1), sig1, sessionPubkey)) return false;

        // verify if sessionPubkeyHash was verified already, if not.. let's do it!
        if (oraclize_randomDS_sessionKeysHashVerified[sessionPubkeyHash] == false){
            oraclize_randomDS_sessionKeysHashVerified[sessionPubkeyHash] = oraclize_randomDS_proofVerify__sessionKeyValidity(proof, sig2offset);
        }

        return oraclize_randomDS_sessionKeysHashVerified[sessionPubkeyHash];
    }


    // the following function has been written by Alex Beregszaszi (@axic), use it under the terms of the MIT license
    function copyBytes(bytes from, uint fromOffset, uint length, bytes to, uint toOffset) internal returns (bytes) {
        uint minLength = length + toOffset;

        if (to.length < minLength) {
            // Buffer too small
            throw; // Should be a better way?
        }

        // NOTE: the offset 32 is added to skip the `size` field of both bytes variables
        uint i = 32 + fromOffset;
        uint j = 32 + toOffset;

        while (i < (32 + fromOffset + length)) {
            assembly {
                let tmp := mload(add(from, i))
                mstore(add(to, j), tmp)
            }
            i += 32;
            j += 32;
        }

        return to;
    }

    // the following function has been written by Alex Beregszaszi (@axic), use it under the terms of the MIT license
    // Duplicate Solidity's ecrecover, but catching the CALL return value
    function safer_ecrecover(bytes32 hash, uint8 v, bytes32 r, bytes32 s) internal returns (bool, address) {
        // We do our own memory management here. Solidity uses memory offset
        // 0x40 to store the current end of memory. We write past it (as
        // writes are memory extensions), but don't update the offset so
        // Solidity will reuse it. The memory used here is only needed for
        // this context.

        // FIXME: inline assembly can't access return values
        bool ret;
        address addr;

        assembly {
            let size := mload(0x40)
            mstore(size, hash)
            mstore(add(size, 32), v)
            mstore(add(size, 64), r)
            mstore(add(size, 96), s)

            // NOTE: we can reuse the request memory because we deal with
            //       the return code
            ret := call(3000, 1, 0, size, 128, size, 32)
            addr := mload(size)
        }

        return (ret, addr);
    }

    // the following function has been written by Alex Beregszaszi (@axic), use it under the terms of the MIT license
    function ecrecovery(bytes32 hash, bytes sig) internal returns (bool, address) {
        bytes32 r;
        bytes32 s;
        uint8 v;

        if (sig.length != 65)
          return (false, 0);

        // The signature format is a compact form of:
        //   {bytes32 r}{bytes32 s}{uint8 v}
        // Compact means, uint8 is not padded to 32 bytes.
        assembly {
            r := mload(add(sig, 32))
            s := mload(add(sig, 64))

            // Here we are loading the last 32 bytes. We exploit the fact that
            // 'mload' will pad with zeroes if we overread.
            // There is no 'mload8' to do this, but that would be nicer.
            v := byte(0, mload(add(sig, 96)))

            // Alternative solution:
            // 'byte' is not working due to the Solidity parser, so lets
            // use the second best option, 'and'
            // v := and(mload(add(sig, 65)), 255)
        }

        // albeit non-transactional signatures are not specified by the YP, one would expect it
        // to match the YP range of [27, 28]
        //
        // geth uses [0, 1] and some clients have followed. This might change, see:
        //  https://github.com/ethereum/go-ethereum/issues/2053
        if (v < 27)
          v += 27;

        if (v != 27 && v != 28)
            return (false, 0);

        return safer_ecrecover(hash, v, r, s);
    }

}
// </ORACLIZE_API>

contract CWC_SaleInterface {
    function balanceOf(address who) constant returns (uint);
    function minterGivesCWC(address _to, uint _value);
    
    event Transfer(address from, address to, uint value, bytes data);
    event MinterGaveCWC(address from, address to, uint value);
}
contract CWC_ReceiverInterface {
/* 
 * @param _from  Token sender address.
 * @param _value Amount of tokens.
 * @param _data  Transaction metadata.
 */
    function CWCfallback(address _from, uint _value, bytes _data);
    event Transfer(address from, address to, uint value, bytes data);
}
library SafeMath {
  function mul(uint a, uint b) internal returns (uint) {
    uint c = a * b;
    assert(a == 0 || c / a == b);
    return c;
  }

  function div(uint a, uint b) internal returns (uint) {
    // assert(b > 0); // Solidity automatically throws when dividing by 0
    uint c = a / b;
    // assert(a == b * c + a % b); // There is no case in which this doesn't hold
    return c;
  }

  function sub(uint a, uint b) internal returns (uint) {
    assert(b <= a);
    return a - b;
  }

  function add(uint a, uint b) internal returns (uint) {
    uint c = a + b;
    assert(c >= a);
    return c;
  }

    
}


contract owned is usingOraclize{
    address public owner;

    function owned() public {
        owner = msg.sender;
    }

    modifier onlyOwner {
        require(msg.sender == owner);
        _;
    }

    function transferOwnership(address newOwner) onlyOwner public {
        owner = newOwner;
    }
    //====================== Utility Functions =========================//
    /// @dev Compares two strings and returns true iff they are equal.
    function stringEqual(string _a, string _b) internal returns (bool) {
        return strCompare(_a, _b) == 0;
    }
    function addressToAsciiString(address x) internal returns (string) {
        bytes memory s = new bytes(40);
        for (uint i = 0; i < 20; i++) {
            byte b = byte(uint8(uint(x) / (2**(8*(19 - i)))));
            byte hi = byte(uint8(b) / 16);
            byte lo = byte(uint8(b) - 16 * uint8(hi));
            s[2*i] = char(hi);
            s[2*i+1] = char(lo);
        }
        return string(s);
    }

    function char(byte b) internal returns (byte c) {
        if (b < 10) return byte(uint8(b) + 0x30);
        else return byte(uint8(b) + 0x57);
    }
    //==================================================================//
}
//===========================================================================
//===========================================================================
//===========================================================================

/* UET, ERC223 based, Credit Washington, Jan 8, 2018 */
/* Developed by Byunggu Yu */
/* Deployment Manual
    After deployed, 
        (1) Set CWC_Address;
        (2) Review and Set minCWCsPerSaleTransaction must be higher than UETCWC (enough to buy one UET plus gas and fees ~4 CWCs)
        (3) Set all Query and Query Data;
        
	Notes:   
	0. tickerQuery is an HTTP POST. (Note: tickerQueryPurpose: (1) Sale; (2) UETreturn (our buyback of UET)
		By default: POST goes to our HTTP server (tickerQuery) with opcode, UET, client_address, and amount.
                You cannot change tickerQueryData (auto generated as follows)
		===> "opcode (3 for sale; 4 for return), UET, client_address, amount, totalUETsSold”
		        Note: amount is CWC for 3 (sale) and UET for 4 (return)
		        Note: above totalUETsSold EXCLUDES the current sale or return of this current ticker.

	1.  result of every POST is the "result" parameter of __callback() in a string.
   		Normal Return: Price to the 5 decimal points (e.g., 6.13245, 6.43000, 6.10000, 10.23534 and 11.43000 and 102.30000)
		Error return definition:
		===> tickerQuery:  return==“err” 			 
*/

contract UET is owned, CWC_ReceiverInterface {
    using SafeMath for uint;

    /* Constructor Variables */
    string public name;
    string public symbol;
    
    /* Settable Fee Structure per Sale and UETreturn transaction */
    address public CWC_Address; //ether payments go to this
    uint minCWCsPerSaleMoreThan=99; //min buy order size in CWCs.
    uint maxCWCsPerSaleLessThan=1000001; //max buy order in CWCs.
    uint minUETsPerReturnMoreThan=0; //min return order size in UETs.
    uint maxUETsPerReturnLessThan=1000001; //max return order in UETs.

    uint public fixedFeeInCWC=1; //default: 0.001 ether, fee per UET Sale invariant to the sale transaction volume
    uint public percentFeeTimes5=1; //default: 0.2% (=1), less than 500cwc ==> fixed 1 cwc percentFee in addition to fixedFeeInCWC
    // percentFee=(uint/500)*percentFeeTimes5
    
    /* Settable variables */
    uint public totalSupply=1000000000000; 
    uint public totalUETsSold=0; // No. of UETs sold on ether payment
    bool public pauseUET=false;
    mapping(address => uint) balances; // How many UETs each address has.
    
    /* ticker for UET sale and return */
    string public tickerQuery="http://52.73.180.197:30123"; 
    string public tickerQueryData=""; //auto generated "opcode (3 for sale; 4 for return), UET, client_address, CWC_amount, totalUETsSold"
    mapping(bytes32 => bool) tickerQueryIds;
    mapping(bytes32 => uint8) tickerQueryPurpose; //(1) [UET]Sale; (2) UETreturn
    string public lastUETCWC; //UETCWC is UETUSD as long as 1 CWC = 1 USD
 
    // UET sale
    mapping(bytes32 => address) waitingBuyer;
    mapping(bytes32 => uint) cwcPaid;

    // UET return
    mapping(bytes32 => address) waitingSeller;
    mapping(bytes32 => uint) UET_Paid;

    /* Public Events */
    //production events
    event receivedCWC(address from, uint amount);
    event soldUET(address to, uint amount, bytes32 myid);
    event receivedUETreturn(address from, uint amount);
    event returnedCWC(address back_to, uint amount);

    event newOraclizeSetProof(string description);
    event needsEther(string description);
    event newTickerQuery(string description, bytes32 myid);
    event newTickerQueryResult(string last_uetcwc, bytes32 myid);
    event errorTickerQueryError(string result, bytes32 myid);
    
    /* Debug Events */
    event debug_string(string description);
    event debug_bool(bool description);
    event debug_uint(uint description);
    
    /* Constructor function */
    function UET(string tokenName, string tokenSymbol) public {
        name = tokenName;           // Set the name for display purposes
        symbol = tokenSymbol;       // Set the symbol for display purposes
        totalSupply = 1000000000000;		   // 1 Trillion UETs
        oraclize_setProof(proofType_TLSNotary | proofStorage_IPFS);
        newOraclizeSetProof("called the function");
    }    

    /* balance checkup */
    function balanceOf(address an_address) constant returns (uint balance) {
        return balances[an_address];
    }
    
    /* Setters */
    function set_CWC_Address(address _CWC_Address) onlyOwner public {
        CWC_Address = _CWC_Address;
    }
    function transfer_ether_to_owner(uint value) onlyOwner public {
	    require(value < this.balance);
        owner.transfer(value);
    }
    function set_totalSupply(uint value) onlyOwner public {
        totalSupply=value;
    }    
    function set_fixedFeeInCWC(uint value) onlyOwner public {
        fixedFeeInCWC=value;
    }    
    function set_percentFeeTimes5(uint value) onlyOwner public {
        percentFeeTimes5=value;
    }    
    function set_minCWCsPerSaleMoreThan(uint value) onlyOwner public {
        minCWCsPerSaleMoreThan=value;
    }   
    function set_maxCWCsPerSaleLessThan(uint value) onlyOwner public {
        maxCWCsPerSaleLessThan=value;
    }
    function set_minUETsPerReturnMoreThan(uint value) onlyOwner public {
        minUETsPerReturnMoreThan=value;
    }   
    function set_maxUETsPerReturnLessThan(uint value) onlyOwner public {
        maxUETsPerReturnLessThan=value;
    }
    function retryOraclizeSetProof(uint Type_1_if_sure) onlyOwner public {
        if(Type_1_if_sure==1) {
            oraclize_setProof(proofType_TLSNotary | proofStorage_IPFS);
            newOraclizeSetProof("manual performed");
        }
    }
    function set_pauseUET(bool _pauseUET) onlyOwner public {
        pauseUET=_pauseUET;
    }
    function set_tickerQuery(string query) onlyOwner public {
        tickerQuery=query;
    }
    function addSomeUETsTo(address target_address, uint how_many) onlyOwner public {
        balances[target_address] = balances[target_address].add(how_many);
    }
    function removeSomeUETsFrom(address target_address, uint how_many) onlyOwner public {
        balances[target_address] = balances[target_address].sub(how_many);
    }
    
    //================================ UET Transfer Transaction ==================================//

    /* ERC223 transfer UETs with data */
    function transfer(address _to, uint _value, bytes _data) public {
        
        balances[msg.sender] = balances[msg.sender].sub(_value); //must have them to send

        if(_to != owner) { //by this, owner will never pass the above balance line
            balances[_to] = balances[_to].add(_value);
        }

	    // Generate an event for the client
        Transfer(msg.sender, _to, _value, _data);

        // Returning UETs
        if(_to == owner) {
            UETreturnTransaction(msg.sender, _value); // <======== Entry to UET Return
        }
    }
    
    /* ERC223 transfer UETs w/o data for ERC20 compatibility */
    function transfer(address _to, uint _value) public {

        bytes memory empty;

        balances[msg.sender] = balances[msg.sender].sub(_value); //must have them to send

        if(_to != owner) { //by this, owner will never pass the above balance line
            balances[_to] = balances[_to].add(_value);
        }

	    // Generate an event for the client
        Transfer(msg.sender, _to, _value, empty);

        // Returning UETs
        if(_to == owner) {
            UETreturnTransaction(msg.sender, _value); // <======== Entry to UET Return
        }
    }

    //================================ UET Sale Transaction ==================================//

    /* The function without name is the default function that is called whenever anyone sends ether */
    /* Receive basic operation gas in this default fallback */
    //msg.value>0 condition will block all incoming custom coins.
    function () payable {require(msg.value>0);} 

    /* ===> Get CWC and Transfer UETs */
    /* Client can buy by sending CWCs to this contract */
    /* 
    * @param _from Token sender address.
    * @param _value Amount of tokens.
    * @param _data Transaction metadata.
    */
    function CWCfallback(address _from, uint _value, bytes _data) public { // <====== Entry to UET Sale

        require(msg.sender == CWC_Address); //Security here. Only CWC_Address can invoke this  
        require(!pauseUET);
        require(_value>minCWCsPerSaleMoreThan && _value<maxCWCsPerSaleLessThan); 
        if (oraclize_getPrice("URL") > this.balance) {
            needsEther("Oraclize query for UET sale was NOT sent, please add some ETH to cover for the query fee");
            revert(); //does this result in the revert in the CWC_Sale, returning all CWCs back automatically?
        } 
        else {
            tickerQueryData = strConcat("3,", "UET,", "0x", addressToAsciiString(_from), ",");
            tickerQueryData = strConcat(tickerQueryData, uint2str(_value), ",", uint2str(totalUETsSold));
            bytes32 queryId = oraclize_query("URL", tickerQuery, tickerQueryData);
            tickerQueryIds[queryId] = true;
            tickerQueryPurpose[queryId] = 1; //1 for UET sale; 2 for UET return
            waitingBuyer[queryId] = _from;
            cwcPaid[queryId] = _value;
            receivedCWC(waitingBuyer[queryId], cwcPaid[queryId]);
            newTickerQuery("Called Oraclize for UET sale. Waiting…", queryId);
        }
    }

    //================================ UET Return Transaction ==================================//

    function UETreturnTransaction(address _from, uint _value) private {
        require(!pauseUET);
        require(_value>minUETsPerReturnMoreThan && _value<maxUETsPerReturnLessThan);
        if (oraclize_getPrice("URL") > this.balance) {
            needsEther("Oraclize query for UET return was NOT sent, please add some ETH to cover for the query fee");
            revert();
        } 
        else {
            tickerQueryData = strConcat("4,", "UET, ", "0x", addressToAsciiString(_from), ",");
            tickerQueryData = strConcat(tickerQueryData, uint2str(_value), ",", uint2str(totalUETsSold));
            bytes32 queryId = oraclize_query("URL", tickerQuery, tickerQueryData);
            tickerQueryIds[queryId] = true;
            tickerQueryPurpose[queryId] = 2; //1 for UET sale; 2 for UET return
            waitingSeller[queryId] = _from;
            UET_Paid[queryId] = _value;
            receivedUETreturn(waitingSeller[queryId], UET_Paid[queryId]);
            newTickerQuery("Called Oraclize for UET return. Waiting…", queryId);
        }
    }


    //================================ UET Return Transaction ==================================//

    function returnCWCto(address _to, uint _value) private {
        CWC_SaleInterface cwc = CWC_SaleInterface(CWC_Address);
        cwc.minterGivesCWC(_to, _value);
    }

    //================================== Orclize __callback() ===================================//

    function __callback(bytes32 myid, string result, bytes proof) {
        // check the validity of the oraclize result
        require(msg.sender == oraclize_cbAddress());
        uint UETCWCtimes100000;
        
        /******* Result to UET Sale tickerQuery *******/
        if(tickerQueryIds[myid]==true && tickerQueryPurpose[myid]==1) { //tickerQueryPurpose==1 is UET Sale

            if(stringEqual(result, "err") || stringEqual(result, "")) {
                errorTickerQueryError(result, myid);
                //process error
                pauseUET=true;
                returnCWCto(waitingBuyer[myid], cwcPaid[myid]); // <=== HTTP ERROR: return all CWC
            }
            else {            
                newTickerQueryResult(result, myid);
                lastUETCWC = result;
                UETCWCtimes100000=parseInt(result,5);
                uint cwcPaidAfterFees;

                if(cwcPaid[myid] < 500) { //less than 500cwcPaid ==> percentFee is 1cwc
                    cwcPaidAfterFees = (cwcPaid[myid]-fixedFeeInCWC)-1;
                }
                else { //more than 500cwcPaid ==> percentFee calculation
                    cwcPaidAfterFees = (cwcPaid[myid]-fixedFeeInCWC)-((cwcPaid[myid]/500)*percentFeeTimes5);
                }
                uint NoOfUETsToGive= (cwcPaidAfterFees*100000)/(UETCWCtimes100000);  // <========= No. Of UETs to Give

                if(NoOfUETsToGive<1) {
                    returnCWCto(waitingBuyer[myid], cwcPaid[myid]); //return all
                }
                else {
                    balances[waitingBuyer[myid]] = balances[waitingBuyer[myid]].add(NoOfUETsToGive);
                    uint NoOfCWCsToReturn= ((cwcPaidAfterFees*100000) - (UETCWCtimes100000*NoOfUETsToGive))/100000; // <==== No. Of CWCs to Return
                    if(NoOfCWCsToReturn>=1) {
                        returnCWCto(waitingBuyer[myid], NoOfCWCsToReturn); //return remaining CWCs
                    }         
                    soldUET(waitingBuyer[myid], NoOfUETsToGive, myid);
                    totalUETsSold = totalUETsSold.add(NoOfUETsToGive);
                }
            }
            delete tickerQueryIds[myid];
            delete tickerQueryPurpose[myid]; 
            delete waitingBuyer[myid];
            delete cwcPaid[myid];
        }

        /******* Result to UET Return tickerQuery *******/
        else if(tickerQueryIds[myid]==true && tickerQueryPurpose[myid]==2) { //tickerQueryPurpose==2 is UET Return

            if(stringEqual(result, "err") || stringEqual(result, "")) {
                errorTickerQueryError(result, myid);
                //process error
                pauseUET=true;
                balances[waitingSeller[myid]] = balances[waitingSeller[myid]].add(UET_Paid[myid]); // <=== HTTP ERROR: return all UETs
            }
            else {            
                newTickerQueryResult(result, myid);
                lastUETCWC = result;
                UETCWCtimes100000=parseInt(result,5);

                uint NoOfCWCsToGive=(UET_Paid[myid]*UETCWCtimes100000)/100000-fixedFeeInCWC; // <======== No. Of CWCs to Give
                returnCWCto(waitingSeller[myid], NoOfCWCsToGive);
                returnedCWC(waitingSeller[myid], NoOfCWCsToGive);
                totalUETsSold = totalUETsSold.sub(UET_Paid[myid]);
            }
            delete tickerQueryIds[myid];
            delete tickerQueryPurpose[myid];
            delete waitingSeller[myid];
            delete UET_Paid[myid];
        }
    }

    //Contemplate removing in the production version
    function perform_selfdestruct(uint Type_1_if_sure) onlyOwner public {
        if(Type_1_if_sure==1) {
            selfdestruct(owner);
        }
    }
}