// File: contracts/oracle/chainlink/ChainlinkOracleUSD.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.7.6;

import "../../lib/AddressSet.sol";
import "../../oracle/OracleCommon.sol";
import "../../interface/IERC20Extended.sol";
import "../../_chainlink/interfaces/AggregatorV3Interface.sol";
import "../../_openzeppelin/math/SafeMath.sol";

/**
 @notice Generic ChainLink Oracle for USD
 */

contract ChainlinkOracleUSD is OracleCommon {

    using SafeMath for uint256;
    using AddressSet for AddressSet.Set;

    // only accepting USD Chainlink oracles, which all use 8 decimals
    uint256 private constant SHIFT_DECIMALS = 10 ** 10;

    // token address => chainlink oracle address
    mapping(address => address) public chainlinkOracles; 
    // interable key set with delete
    AddressSet.Set chainlinkOraclesSet;
    
    event RegisterChainlinkOracle(address sender, address token, address oracle);
    event UpdateChainlinkOracle(address sender, address token, address oracle);
    event UnregisterChainlinkOracle(address sender, address token);
    
    /** 
     @param oneTokenFactory_ oneToken factory to bind to
     @param description_ description has no bearing on logic
     @param indexToken_ token to use for price quotes
     */
    constructor(address oneTokenFactory_, string memory description_, address indexToken_)
        OracleCommon(oneTokenFactory_, description_, indexToken_) {
    }

    /**
     @notice update is called when a oneToken wants to persist observations
     @dev there is nothing to do in this case
     */
    function update(address /* token */) external override {}

    /**
     @notice returns equivalent amount of index tokens for an amount of baseTokens and volatility metric
     @param token address of the token
     @param amountTokens quantity, token native precision
     @param amountUsd US dollar equivalent, precision 18
     @param volatility metric for future use-cases
     */
    function read(address token, uint256 amountTokens) external view override returns(uint256 amountUsd, uint256 volatility) {
        uint256 normalizedAmountUsd = tokensToNormalized(token, amountTokens);
        amountUsd = (normalizedAmountUsd.mul(getThePrice(token))).div(PRECISION);
        volatility = 1;
    }

    /**
     @notice returns the tokens needed to reach a target usd value
     @param token address of the token
     @param amountUsd Usd required, precision 18
     @param amountTokens tokens required, token native precision
     @param volatility metric for future use-cases
     */
    function amountRequired(address token, uint256 amountUsd) external view override returns(uint256 amountTokens, uint256 volatility) {
        uint256 normalizedAmountTokens = amountUsd.mul(PRECISION).div(getThePrice(token));
        amountTokens = normalizedToTokens(token, normalizedAmountTokens);
        volatility = 1;
    }

    /**
     * @notice returns the latest price for the token
     * @param token address of the token
     */
    function getThePrice(address token) public view returns (uint256 price) {
        require(chainlinkOraclesSet.exists(token), "ChainlinkOracle: unknown token");
        (
            , 
            int256 price_,
            ,
            ,
            
        ) = AggregatorV3Interface(chainlinkOracles[token]).latestRoundData();
        require(price_ > 0); // price oracle responded 0, or negative. No event emitted because this is a view function.
        price = uint256(price_);
        price = price.mul(SHIFT_DECIMALS);  //price is natively in 8 decimals make it 18
    }

    /*********************************
     * Discoverable Internal Structure
     *********************************/

    /**
     * @notice count registered Chainlink oracles
     * @param count number of registered Chainlink oracles
     */
    function oraclesCount() external view returns(uint256 count) {
        count = chainlinkOraclesSet.count();
    }

    /**
     * @notice enumerate the registered Chainlink oracles
     * @param index row number to inspect
     * @param oracle address of the Chainlink oracle
     */
    function oracleAtIndex(uint256 index) external view returns(address oracle) {
        require(chainlinkOraclesSet.count() > index, "ChainlinkOracle: index number is too high");
        oracle = chainlinkOracles[chainlinkOraclesSet.keyAtIndex(index)];
    }

    /**
     * @notice enumerate the registered tokens
     * @param index row number to inspect
     * @param token address of the registered token
     */
    function tokenAtIndex(uint256 index) external view returns(address token) {
        require(chainlinkOraclesSet.count() > index, "ChainlinkOracle: index number is too high");
        token = chainlinkOraclesSet.keyAtIndex(index);
    }

    /*********************************
     * CRUD
     *********************************/

    /**
     * @notice register a new Chainlink oracle
     * @param token address of the token to register the oracle for
     * @param oracle address of the Chainlink oracle to register
     */
    function registerOracle(address token, address oracle) external onlyOwner {
        require(AggregatorV3Interface(oracle).decimals() == 8, "ChainlinkOracle: the oracle must return USD values");
        chainlinkOraclesSet.insert(token, "ChainlinkOracle: oracle is already registered");
        chainlinkOracles[token] = oracle;
        emit RegisterChainlinkOracle(msg.sender, token, oracle);
    }

    /**
     * @notice unregister a Chainlink oracle
     * @param token address of the token to unregister the oracle for
     */
    function unregisterOracle(address token) external onlyOwner {
        chainlinkOraclesSet.remove(token, "ChainlinkOracle: unknown token");
        delete chainlinkOracles[token];
        emit UnregisterChainlinkOracle(msg.sender, token);
    }

    /**
     * @notice replace oracle for the given token
     * @param token address of the token to have the oracle replaced
     * @param oracle address of the new Chainlink oracle to be used for the token
     */
    function updateOracle(address token, address oracle) external onlyOwner {
        require(chainlinkOraclesSet.exists(token), "ChainlinkOracle: unknown token");
        require(AggregatorV3Interface(oracle).decimals() == 8, "ChainlinkOracle: the oracle must return USD values");
        chainlinkOracles[token] = oracle;
        emit UpdateChainlinkOracle(msg.sender, token, oracle);
    }

}
// File: contracts/lib/AddressSet.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.7.6;

/**
 * @notice Key sets with enumeration and delete. Uses mappings for random access
 * and existence checks and dynamic arrays for enumeration. Key uniqueness is enforced. 
 * @dev Sets are unordered. Delete operations reorder keys. All operations have a 
 * fixed gas cost at any scale, O(1). 
 */

library AddressSet {
    
    struct Set {
        mapping(address => uint256) keyPointers;
        address[] keyList;
    }

    /**
     @notice insert a key. 
     @dev duplicate keys are not permitted.
     @param self storage pointer to a Set. 
     @param key value to insert.
     */    
    function insert(Set storage self, address key, string memory errorMessage) internal {
        require(!exists(self, key), errorMessage);
        self.keyList.push(key);
        self.keyPointers[key] = self.keyList.length-1;
    }

    /**
     @notice remove a key.
     @dev key to remove must exist. 
     @param self storage pointer to a Set.
     @param key value to remove.
     */    
    function remove(Set storage self, address key, string memory errorMessage) internal {
        require(exists(self, key), errorMessage);
        uint256 last = count(self) - 1;
        uint256 rowToReplace = self.keyPointers[key];
        address keyToMove = self.keyList[last];
        self.keyPointers[keyToMove] = rowToReplace;
        self.keyList[rowToReplace] = keyToMove;
        delete self.keyPointers[key];
        self.keyList.pop();
    }

    /**
     @notice count the keys.
     @param self storage pointer to a Set. 
     */       
    function count(Set storage self) internal view returns(uint256) {
        return(self.keyList.length);
    }

    /**
     @notice check if a key is in the Set.
     @param self storage pointer to a Set.
     @param key value to check. Version
     @return bool true: Set member, false: not a Set member.
     */  
    function exists(Set storage self, address key) internal view returns(bool) {
        if(self.keyList.length == 0) return false;
        return self.keyList[self.keyPointers[key]] == key;
    }

    /**
     @notice fetch a key by row (enumerate).
     @param self storage pointer to a Set.
     @param index row to enumerate. Must be < count() - 1.
     */      
    function keyAtIndex(Set storage self, uint256 index) internal view returns(address) {
        return self.keyList[index];
    }
}

// File: contracts/oracle/OracleCommon.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.7.6;

import "../interface/IOracle.sol";
import "../common/ICHIModuleCommon.sol";

abstract contract OracleCommon is IOracle, ICHIModuleCommon {

    uint256 constant NORMAL = 18;
    bytes32 constant public override MODULE_TYPE = keccak256(abi.encodePacked("ICHI V1 Oracle Implementation"));
    address public override indexToken;

    event OracleDeployed(address sender, string description, address indexToken);
    event OracleInitialized(address sender, address baseToken, address indexToken);
    
    /**
     @notice records the oracle description and the index that will be used for all quotes
     @dev oneToken implementations can share oracles
     @param oneTokenFactory_ oneTokenFactory to bind to
     @param description_ all modules have a description. No processing or validation
     @param indexToken_ every oracle has an index token for reporting the value of a base token
     */
    constructor(address oneTokenFactory_, string memory description_, address indexToken_) 
        ICHIModuleCommon(oneTokenFactory_, ModuleType.Oracle, description_) 
    { 
        require(indexToken_ != NULL_ADDRESS, "OracleCommon: indexToken cannot be empty");
        indexToken = indexToken_;
        emit OracleDeployed(msg.sender, description_, indexToken_);
    }

    /**
     @notice oneTokens can share Oracles. Oracles must be re-initializable. They are initialized from the Factory.
     @param baseToken oracles _can be_ multi-tenant with separately initialized baseTokens
     */
    function init(address baseToken) external onlyModuleOrFactory virtual override {
        emit OracleInitialized(msg.sender, baseToken, indexToken);
    }

    /**
     @notice converts normalized precision 18 amounts to token native precision amounts, truncates low-order values
     @param token ERC20 token contract
     @param amountNormal quantity in precision-18
     @param amountTokens quantity scaled to token decimals()
     */    
    function normalizedToTokens(address token, uint256 amountNormal) public view override returns(uint256 amountTokens) {
        IERC20Extended t = IERC20Extended(token);
        uint256 nativeDecimals = t.decimals();
        require(nativeDecimals <= 18, "OracleCommon: unsupported token precision (greater than 18)");
        if(nativeDecimals == NORMAL) return amountNormal;
        return amountNormal / ( 10 ** (NORMAL - nativeDecimals));
    }

    /**
     @notice converts token native precision amounts to normalized precision 18 amounts
     @param token ERC20 token contract
     @param amountTokens quantity scaled to token decimals
     @param amountNormal quantity in precision-18
     */  
    function tokensToNormalized(address token, uint256 amountTokens) public view override returns(uint256 amountNormal) {
        IERC20Extended t = IERC20Extended(token);
        uint256 nativeDecimals = t.decimals();
        require(nativeDecimals <= 18, "OracleCommon: unsupported token precision (greater than 18)");
        if(nativeDecimals == NORMAL) return amountTokens;
        return amountTokens * ( 10 ** (NORMAL - nativeDecimals));
    }

}

// File: contracts/interface/IERC20Extended.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.7.6;

import "../_openzeppelin/token/ERC20/IERC20.sol";

interface IERC20Extended is IERC20 {
    
    function decimals() external view returns(uint8);
    function symbol() external view returns(string memory);
    function name() external view returns(string memory);
}

// File: contracts/_chainlink/interfaces/AggregatorV3Interface.sol



// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;

interface AggregatorV3Interface {

  function decimals()
    external
    view
    returns (
      uint8
    );

  function description()
    external
    view
    returns (
      string memory
    );

  function version()
    external
    view
    returns (
      uint256
    );

  // getRoundData and latestRoundData should both raise "No data present"
  // if they do not have data to report, instead of returning unset values
  // which could be misinterpreted as actual reported values.
  function getRoundData(
    uint80 _roundId
  )
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

  function latestRoundData()
    external
    view
    returns (
      uint80 roundId,
      int256 answer,
      uint256 startedAt,
      uint256 updatedAt,
      uint80 answeredInRound
    );

}
// File: contracts/_openzeppelin/math/SafeMath.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        uint256 c = a + b;
        if (c < a) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b > a) return (false, 0);
        return (true, a - b);
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) return (true, 0);
        uint256 c = a * b;
        if (c / a != b) return (false, 0);
        return (true, c);
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a / b);
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        if (b == 0) return (false, 0);
        return (true, a % b);
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) return 0;
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: division by zero");
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b > 0, "SafeMath: modulo by zero");
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        return a - b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryDiv}.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        return a % b;
    }
}

// File: contracts/interface/IOracle.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.7.6;

import "./IModule.sol";

interface IOracle is IModule {

    function init(address baseToken) external;
    function update(address token) external;
    function indexToken() external view returns(address);

    /**
     @param token ERC20 token
     @param amountTokens quantity, token native precision
     @param amountUsd US dollar equivalent, precision 18
     @param volatility metric for future use-cases
     */
    function read(address token, uint amountTokens) external view returns(uint amountUsd, uint volatility);

    /**
     @param token ERC20 token
     @param amountTokens token quantity, token native precision
     @param amountUsd US dollar equivalent, precision 18
     @param volatility metric for future use-cases
     */    
    function amountRequired(address token, uint amountUsd) external view returns(uint amountTokens, uint volatility);

    /**
     @notice converts normalized precision-18 amounts to token native precision amounts, truncates low-order values
     @param token ERC20 token contract
     @param amountNormal quantity, precision 18
     @param amountTokens quantity scaled to token precision
     */    
    function normalizedToTokens(address token, uint amountNormal) external view returns(uint amountTokens);

    /**
     @notice converts token native precision amounts to normalized precision-18 amounts
     @param token ERC20 token contract
     @param amountNormal quantity, precision 18
     @param amountTokens quantity scaled to token precision
     */  
    function tokensToNormalized(address token, uint amountTokens) external view returns(uint amountNormal);
}

// File: contracts/common/ICHIModuleCommon.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.7.6;

import "../interface/IModule.sol";
import "../interface/IOneTokenFactory.sol";
import "../interface/IOneTokenV1Base.sol";
import "./ICHICommon.sol";

abstract contract ICHIModuleCommon is IModule, ICHICommon {
    
    ModuleType public immutable override moduleType;
    string public override moduleDescription;
    address public immutable override oneTokenFactory;

    event ModuleDeployed(address sender, ModuleType moduleType, string description);
    event DescriptionUpdated(address sender, string description);
   
    modifier onlyKnownToken {
        require(IOneTokenFactory(oneTokenFactory).isOneToken(msg.sender), "ICHIModuleCommon: msg.sender is not a known oneToken");
        _;
    }
    
    modifier onlyTokenOwner (address oneToken) {
        require(msg.sender == IOneTokenV1Base(oneToken).owner(), "ICHIModuleCommon: msg.sender is not oneToken owner");
        _;
    }

    modifier onlyModuleOrFactory {
        if(!IOneTokenFactory(oneTokenFactory).isModule(msg.sender)) {
            require(msg.sender == oneTokenFactory, "ICHIModuleCommon: msg.sender is not module owner, token factory or registed module");
        }
        _;
    }
    
    /**
     @notice modules are bound to the factory at deployment time
     @param oneTokenFactory_ factory to bind to
     @param moduleType_ type number helps prevent governance errors
     @param description_ human-readable, descriptive only
     */    
    constructor (address oneTokenFactory_, ModuleType moduleType_, string memory description_) {
        require(oneTokenFactory_ != NULL_ADDRESS, "ICHIModuleCommon: oneTokenFactory cannot be empty");
        require(bytes(description_).length > 0, "ICHIModuleCommon: description cannot be empty");
        oneTokenFactory = oneTokenFactory_;
        moduleType = moduleType_;
        moduleDescription = description_;
        emit ModuleDeployed(msg.sender, moduleType_, description_);
    }

    /**
     @notice set a module description
     @param description new module desciption
     */
    function updateDescription(string memory description) external onlyOwner override {
        require(bytes(description).length > 0, "ICHIModuleCommon: description cannot be empty");
        moduleDescription = description;
        emit DescriptionUpdated(msg.sender, description);
    }  
}

// File: contracts/interface/IModule.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.7.6;

import "./IICHICommon.sol";
import "./InterfaceCommon.sol";

interface IModule is IICHICommon { 
       
    function oneTokenFactory() external view returns(address);
    function updateDescription(string memory description) external;
    function moduleDescription() external view returns(string memory);
    function MODULE_TYPE() external view returns(bytes32);
    function moduleType() external view returns(ModuleType);
}

// File: contracts/interface/IICHICommon.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.7.6;

import "./IICHIOwnable.sol";
import "./InterfaceCommon.sol";

interface IICHICommon is IICHIOwnable, InterfaceCommon {}

// File: contracts/interface/InterfaceCommon.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.7.6;
pragma abicoder v2;

interface InterfaceCommon {

    enum ModuleType { Version, Controller, Strategy, MintMaster, Oracle }

}

// File: contracts/interface/IICHIOwnable.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.7.6;

interface IICHIOwnable {
    
    function renounceOwnership() external;
    function transferOwnership(address newOwner) external;
    function owner() external view returns (address);
}

// File: contracts/interface/IOneTokenFactory.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.7.6;
pragma abicoder v2;

import "./InterfaceCommon.sol";

interface IOneTokenFactory is InterfaceCommon {

    function oneTokenProxyAdmins(address) external returns(address);
    function deployOneTokenProxy(
        string memory name,
        string memory symbol,
        address governance, 
        address version,
        address controller,
        address mintMaster,              
        address memberToken, 
        address collateral,
        address oneTokenOracle
    ) 
        external 
        returns(address newOneTokenProxy, address proxyAdmin);

    function admitModule(address module, ModuleType moduleType, string memory name, string memory url) external;
    function updateModule(address module, string memory name, string memory url) external;
    function removeModule(address module) external;

    function admitForeignToken(address foreignToken, bool collateral, address oracle) external;
    function updateForeignToken(address foreignToken, bool collateral) external;
    function removeForeignToken(address foreignToken) external;

    function assignOracle(address foreignToken, address oracle) external;
    function removeOracle(address foreignToken, address oracle) external; 

    /**
     * View functions
     */
    
    function MODULE_TYPE() external view returns(bytes32);

    function oneTokenCount() external view returns(uint256);
    function oneTokenAtIndex(uint256 index) external view returns(address);
    function isOneToken(address oneToken) external view returns(bool);
 
    // modules

    function moduleCount() external view returns(uint256);
    function moduleAtIndex(uint256 index) external view returns(address module);
    function isModule(address module) external view returns(bool);
    function isValidModuleType(address module, ModuleType moduleType) external view returns(bool);

    // foreign tokens

    function foreignTokenCount() external view returns(uint256);
    function foreignTokenAtIndex(uint256 index) external view returns(address);
    function foreignTokenInfo(address foreignToken) external view returns(bool collateral, uint256 oracleCount);
    function foreignTokenOracleCount(address foreignToken) external view returns(uint256);
    function foreignTokenOracleAtIndex(address foreignToken, uint256 index) external view returns(address);
    function isOracle(address foreignToken, address oracle) external view returns(bool);
    function isForeignToken(address foreignToken) external view returns(bool);
    function isCollateral(address foreignToken) external view returns(bool);
}
// File: contracts/interface/IOneTokenV1Base.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.7.6;

import "./IICHICommon.sol";
import "./IERC20Extended.sol";

interface IOneTokenV1Base is IICHICommon, IERC20 {
    
    function init(string memory name_, string memory symbol_, address oneTokenOracle_, address controller_,  address mintMaster_, address memberToken_, address collateral_) external;
    function changeController(address controller_) external;
    function changeMintMaster(address mintMaster_, address oneTokenOracle) external;
    function addAsset(address token, address oracle) external;
    function removeAsset(address token) external;
    function setStrategy(address token, address strategy, uint256 allowance) external;
    function executeStrategy(address token) external;
    function removeStrategy(address token) external;
    function closeStrategy(address token) external;
    function increaseStrategyAllowance(address token, uint256 amount) external;
    function decreaseStrategyAllowance(address token, uint256 amount) external;
    function setFactory(address newFactory) external;

    function MODULE_TYPE() external view returns(bytes32);
    function oneTokenFactory() external view returns(address);
    function controller() external view returns(address);
    function mintMaster() external view returns(address);
    function memberToken() external view returns(address);
    function assets(address) external view returns(address, address);
    function balances(address token) external view returns(uint256 inVault, uint256 inStrategy);
    function collateralTokenCount() external view returns(uint256);
    function collateralTokenAtIndex(uint256 index) external view returns(address);
    function isCollateral(address token) external view returns(bool);
    function otherTokenCount() external view  returns(uint256);
    function otherTokenAtIndex(uint256 index) external view returns(address); 
    function isOtherToken(address token) external view returns(bool);
    function assetCount() external view returns(uint256);
    function assetAtIndex(uint256 index) external view returns(address); 
    function isAsset(address token) external view returns(bool);
}

// File: contracts/common/ICHICommon.sol



// SPDX-License-Identifier: BUSL-1.1

pragma solidity 0.7.6;

import "../oz_modified/ICHIOwnable.sol";
import "../oz_modified/ICHIInitializable.sol";
import "../interface/IERC20Extended.sol";
import "../interface/IICHICommon.sol";

contract ICHICommon is IICHICommon, ICHIOwnable, ICHIInitializable {

    uint256 constant PRECISION = 10 ** 18;
    uint256 constant INFINITE = uint256(0-1);
    address constant NULL_ADDRESS = address(0);
    
    // @dev internal fingerprints help prevent deployment-time governance errors

    bytes32 constant COMPONENT_CONTROLLER = keccak256(abi.encodePacked("ICHI V1 Controller"));
    bytes32 constant COMPONENT_VERSION = keccak256(abi.encodePacked("ICHI V1 OneToken Implementation"));
    bytes32 constant COMPONENT_STRATEGY = keccak256(abi.encodePacked("ICHI V1 Strategy Implementation"));
    bytes32 constant COMPONENT_MINTMASTER = keccak256(abi.encodePacked("ICHI V1 MintMaster Implementation"));
    bytes32 constant COMPONENT_ORACLE = keccak256(abi.encodePacked("ICHI V1 Oracle Implementation"));
    bytes32 constant COMPONENT_VOTERROLL = keccak256(abi.encodePacked("ICHI V1 VoterRoll Implementation"));
    bytes32 constant COMPONENT_FACTORY = keccak256(abi.encodePacked("ICHI OneToken Factory"));
}

// File: contracts/_openzeppelin/token/ERC20/IERC20.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: contracts/oz_modified/ICHIOwnable.sol



// SPDX-License-Identifier: MIT

/**
 * @dev Constructor visibility has been removed from the original.
 * _transferOwnership() has been added to support proxied deployments.
 * Abstract tag removed from contract block.
 * Added interface inheritance and override modifiers.
 * Changed contract identifier in require error messages.
 */

pragma solidity >=0.6.0 <0.8.0;

import "../_openzeppelin/utils/Context.sol";
import "../interface/IICHIOwnable.sol";
/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract ICHIOwnable is IICHIOwnable, Context {
    
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Throws if called by any account other than the owner.
     */
     
    modifier onlyOwner() {
        require(owner() == _msgSender(), "ICHIOwnable: caller is not the owner");
        _;
    }    

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     * Ineffective for proxied deployed. Use initOwnable.
     */
    constructor() {
        _transferOwnership(msg.sender);
    }

    /**
     @dev initialize proxied deployment
     */
    function initOwnable() internal {
        require(owner() == address(0), "ICHIOwnable: already initialized");
        _transferOwnership(msg.sender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual override returns (address) {
        return _owner;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual override onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */

    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev be sure to call this in the initialization stage of proxied deployment or owner will not be set
     */

    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "ICHIOwnable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: contracts/oz_modified/ICHIInitializable.sol



// SPDX-License-Identifier: MIT

pragma solidity 0.7.6;

import "../_openzeppelin/utils/Address.sol";

contract ICHIInitializable {

    bool private _initialized;
    bool private _initializing;

    modifier initializer() {
        require(_initializing || _isConstructor() || !_initialized, "ICHIInitializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }

    modifier initialized {
        require(_initialized, "ICHIInitializable: contract is not initialized");
        _;
    }

    function _isConstructor() private view returns (bool) {
        return !Address.isContract(address(this));
    }
}



// File: contracts/_openzeppelin/utils/Context.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: contracts/_openzeppelin/utils/Address.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.6.2 <0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize, which returns 0 for contracts in
        // construction, since the code is only stored at the end of the
        // constructor execution.

        uint256 size;
        // solhint-disable-next-line no-inline-assembly
        assembly { size := extcodesize(account) }
        return size > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value
        (bool success, ) = recipient.call{ value: amount }("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain`call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
      return functionCall(target, data, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        require(isContract(target), "Address: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.call{ value: value }(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) {
        require(isContract(target), "Address: static call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.staticcall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) {
        require(isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return _verifyCallResult(success, returndata, errorMessage);
    }

    function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) {
        if (success) {
            return returndata;
        } else {
            // Look for revert reason and bubble it up if present
            if (returndata.length > 0) {
                // The easiest way to bubble the revert reason is using memory via assembly

                // solhint-disable-next-line no-inline-assembly
                assembly {
                    let returndata_size := mload(returndata)
                    revert(add(32, returndata), returndata_size)
                }
            } else {
                revert(errorMessage);
            }
        }
    }
}