pragma solidity ^0.4.4;

contract Token {

    /// @return total amount of tokens
    function totalSupply() constant returns (uint256 supply) {}

    /// @param _owner The address from which the balance will be retrieved
    /// @return The balance
    function balanceOf(address _owner) constant returns (uint256 balance) {}

    /// @notice send `_value` token to `_to` from `msg.sender`
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return Whether the transfer was successful or not
    function transfer(address _to, uint256 _value) returns (bool success) {}

    /// @notice send `_value` token to `_to` from `_from` on the condition it is approved by `_from`
    /// @param _from The address of the sender
    /// @param _to The address of the recipient
    /// @param _value The amount of token to be transferred
    /// @return Whether the transfer was successful or not
    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {}

    /// @notice `msg.sender` approves `_addr` to spend `_value` tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @param _value The amount of wei to be approved for transfer
    /// @return Whether the approval was successful or not
    function approve(address _spender, uint256 _value) returns (bool success) {}

    /// @param _owner The address of the account owning tokens
    /// @param _spender The address of the account able to transfer the tokens
    /// @return Amount of remaining tokens allowed to spent
    function allowance(address _owner, address _spender) constant returns (uint256 remaining) {}

    event Transfer(address indexed _from, address indexed _to, uint256 _value);
    event Approval(address indexed _owner, address indexed _spender, uint256 _value);

}

contract StandardToken is Token {

    function transfer(address _to, uint256 _value) returns (bool success) {
        //Default assumes totalSupply can't be over max (2^256 - 1).
        //If your token leaves out totalSupply and can issue more tokens as time goes on, you need to check if it doesn't wrap.
        //Replace the if with this one instead.
        //if (balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
        if (balances[msg.sender] >= _value && _value > 0) {
            balances[msg.sender] -= _value;
            balances[_to] += _value;
            Transfer(msg.sender, _to, _value);
            return true;
        } else { return false; }
    }

    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
        //same as above. Replace this line with the following if you want to protect against wrapping uints.
        //if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
        if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {
            balances[_to] += _value;
            balances[_from] -= _value;
            allowed[_from][msg.sender] -= _value;
            Transfer(_from, _to, _value);
            return true;
        } else { return false; }
    }

    function balanceOf(address _owner) constant returns (uint256 balance) {
        return balances[_owner];
    }

    function approve(address _spender, uint256 _value) returns (bool success) {
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);
        return true;
    }

    function allowance(address _owner, address _spender) constant returns (uint256 remaining) {
      return allowed[_owner][_spender];
    }

    mapping (address => uint256) balances;
    mapping (address => mapping (address => uint256)) allowed;
    uint256 public totalSupply;
}

contract BST is StandardToken { // CHANGE THIS. Update the contract name.

    /* Public variables of the token */

    /*
    NOTE:
    The following variables are OPTIONAL vanities. One does not have to include them.
    They allow one to customise the token contract & in no way influences the core functionality.
    Some wallets/interfaces might not even bother to look at this information.
    */
    string public name;                   // Token Name
    uint8 public decimals;                // How many decimals to show. To be standard complicant keep it 18
    string public symbol;                 // An identifier: eg SBX, XPR etc..
    string public version = "H1.0"; 
    uint256 public unitsOneEthCanBuy;     // How many units of your coin can be bought by 1 ETH?
    uint256 public units30percentExtra;
    uint256 public units40percentExtra;
    uint256 public units50percentExtra;
    uint256 public totalEthInWei;         // WEI is the smallest unit of ETH (the equivalent of cent in USD or satoshi in BTC). We'll store the total ETH raised via our ICO here.  
    address public fundsWallet;           // Where should the raised ETH go?
    uint256 public maxHardCaphardcap;     // Max hard cap
    uint256 private unitEthWei;
    uint private IEOEndDate;
    uint private tokenMoveableDate;
    bool private isIEOActive;

    // This is a constructor function 
    // which means the following function name has to match the contract name declared above
    function BST() {
        unitEthWei = 1000000000000000000;
        balances[msg.sender] = 1000000000000000;               // Give the creator all initial tokens. This is set to 1000 for example. If you want your initial tokens to be X and your decimal is 5, set this value to X * 100000. (CHANGE THIS)
        totalSupply = 1000000000000000;                        // Update total supply (1000 for example) (CHANGE THIS)
        name = "BST";                                   // Set the name for display purposes (CHANGE THIS)
        decimals = 6;                                               // Amount of decimals for display purposes (CHANGE THIS)
        symbol = "BST";                                             // Set the symbol for display purposes (CHANGE THIS)
        unitsOneEthCanBuy = 5000;                                      // Set the price of your token for the ICO (CHANGE THIS)
        units30percentExtra = 6500;
        units40percentExtra = 7000;
        units50percentExtra = 7500;
        fundsWallet = msg.sender;                                    // The owner of the contract gets ETH
        maxHardCaphardcap = 20000;
        IEOEndDate = 1529020800; // 15th June 2018 00:00:00
        tokenMoveableDate = 1539388800; // 13th Oct 2018 00:00:00 --- 120 days from 15th June 2018
        isIEOActive = isWithinIEO();
    }

    function() payable {
        if(!isWithinIEO()) {
            throw;
        }
        totalEthInWei = totalEthInWei + msg.value;
        uint256 amount = 0;

        if(msg.value < convertToEther(1)) {
            amount = msg.value * unitsOneEthCanBuy;
        }else if(msg.value >= convertToEther(1) && msg.value < convertToEther(9)) {
            amount = msg.value * units30percentExtra;
        }else if(msg.value >= convertToEther(10) && msg.value <= convertToEther(99)) {
            amount = msg.value * units40percentExtra;
        }else if(msg.value >= convertToEther(100) && msg.value < convertToEther(maxHardCaphardcap)) {
            amount = msg.value * units50percentExtra;
        }else if(msg.value > convertToEther(maxHardCaphardcap)) {
            throw;
        }

        amount = amount / 1000000000000;

        if (balances[fundsWallet] < amount) {
            throw;
        }

        balances[fundsWallet] = balances[fundsWallet] - amount;
        balances[msg.sender] = balances[msg.sender] + amount;
        
        Transfer(fundsWallet, msg.sender, amount); // Broadcast a message to the blockchain

        //Transfer ether to fundsWallet
        fundsWallet.transfer(msg.value);                               
    }

    function convertToEther(uint256 _value) returns (uint256 val) {
        uint256 _return = _value * unitEthWei;
        return _return;
    }

    /* Approves and then calls the receiving contract */
    function approveAndCall(address _spender, uint256 _value, bytes _extraData) returns (bool success) {
        allowed[msg.sender][_spender] = _value;
        Approval(msg.sender, _spender, _value);

        //call the receiveApproval function on the contract you want to be notified. This crafts the function signature manually so one doesn't have to include a contract in here just for this.
        //receiveApproval(address _from, uint256 _value, address _tokenContract, bytes _extraData)
        //it is assumed that when does this that the call *should* succeed, otherwise one would use vanilla approve instead.
        if(!_spender.call(bytes4(bytes32(sha3("receiveApproval(address,uint256,address,bytes)"))), msg.sender, _value, this, _extraData)) { throw; }
        return true;
    }

    function isWithinIEO() returns (bool success) {
        if(now > IEOEndDate) {
            return false;
        }else {
            return true;
        }
    }

    function canMovetoken() returns (bool success){
        if(now > tokenMoveableDate) {
            return true;
        }else {
            return false;
        }
    }

    function transfer(address _to, uint256 _value) returns (bool success) {
        //Default assumes totalSupply can't be over max (2^256 - 1).
        //If your token leaves out totalSupply and can issue more tokens as time goes on, you need to check if it doesn't wrap.
        //Replace the if with this one instead.
        //if (balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
        if (isWithinIEO() || !canMovetoken()) {
            throw;
        }else {
            if (balances[msg.sender] >= _value && _value > 0) {
                balances[msg.sender] -= _value;
                balances[_to] += _value;
                Transfer(msg.sender, _to, _value);
                return true;
            } else { return false; }
        }
        
    }

    function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
        //same as above. Replace this line with the following if you want to protect against wrapping uints.
        //if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && balances[_to] + _value > balances[_to]) {
        if (isWithinIEO() || !canMovetoken()) {
            throw;
        }else {
            if (balances[_from] >= _value && allowed[_from][msg.sender] >= _value && _value > 0) {
                balances[_to] += _value;
                balances[_from] -= _value;
                allowed[_from][msg.sender] -= _value;
                Transfer(_from, _to, _value);
                return true;
            } else { return false; }
        }
        
    }
}