pragma solidity >0.5.4;

import "../identity/IdentityGuard.sol";
import "../dao/schemes/FormulaHolder.sol";
import "./ERC677BridgeToken.sol";

/**
 * @title The GoodDollar ERC677 token contract
 */
contract GoodDollar is ERC677BridgeToken, IdentityGuard, FormulaHolder {
    address feeRecipient;

    // Overrides hard-coded decimal in DAOToken
    uint256 public constant decimals = 2;

    /**
     * @dev constructor
     * @param _name The name of the token
     * @param _symbol The symbol of the token
     * @param _cap the cap of the token. no cap if 0
     * @param _formula the fee formula contract
     * @param _identity the identity contract
     * @param _feeRecipient the address that receives transaction fees
     */
    constructor(
        string memory _name,
        string memory _symbol,
        uint256 _cap,
        AbstractFees _formula,
        Identity _identity,
        address _feeRecipient
    )
        public
        ERC677BridgeToken(_name, _symbol, _cap)
        IdentityGuard(_identity)
        FormulaHolder(_formula)
    {
        feeRecipient = _feeRecipient;
    }

    /**
     * @dev Processes fees from given value and sends
     * remainder to given address
     * @param to the address to be sent to
     * @param value the value to be processed and then
     * transferred
     * @return a boolean that indicates if the operation was successful
     */
    function transfer(address to, uint256 value) public returns (bool) {
        uint256 bruttoValue = processFees(msg.sender, to, value);
        return super.transfer(to, bruttoValue);
    }

    /**
     * @dev Approve the passed address to spend the specified
     * amount of tokens on behalf of msg.sender
     * @param spender The address which will spend the funds
     * @param value The amount of tokens to be spent
     * @return a boolean that indicates if the operation was successful
     */
    function approve(address spender, uint256 value) public returns (bool) {
        return super.approve(spender, value);
    }

    /**
     * @dev Transfer tokens from one address to another
     * @param from The address which you want to send tokens from
     * @param to The address which you want to transfer to
     * @param value the amount of tokens to be transferred
     * @return a boolean that indicates if the operation was successful
     */
    function transferFrom(
        address from,
        address to,
        uint256 value
    ) public returns (bool) {
        uint256 bruttoValue = processFees(from, to, value);
        return super.transferFrom(from, to, bruttoValue);
    }

    /**
     * @dev Processes transfer fees and calls ERC677Token transferAndCall function
     * @param to address to transfer to
     * @param value the amount to transfer
     * @param data The data to pass to transferAndCall
     * @return a bool indicating if transfer function succeeded
     */
    function transferAndCall(
        address to,
        uint256 value,
        bytes calldata data
    ) external returns (bool) {
        uint256 bruttoValue = processFees(msg.sender, to, value);
        return super._transferAndCall(to, bruttoValue, data);
    }

    /**
     * @dev Minting function
     * @param to the address that will receive the minted tokens
     * @param value the amount of tokens to mint
     * @return a boolean that indicated if the operation was successful
     */
    function mint(address to, uint256 value)
        public
        onlyMinter
        requireNotBlacklisted(to)
        returns (bool)
    {
        if (cap > 0) {
            require(totalSupply().add(value) <= cap, "Cannot increase supply beyond cap");
        }
        super._mint(to, value);
        return true;
    }

    /**
     * @dev Burns a specific amount of tokens.
     * @param value The amount of token to be burned.
     */
    function burn(uint256 value) public onlyNotBlacklisted {
        super.burn(value);
    }

    /**
     * @dev Burns a specific amount of tokens from the target address and decrements allowance
     * @param from address The address which you want to send tokens from
     * @param value uint256 The amount of token to be burned
     */
    function burnFrom(address from, uint256 value)
        public
        onlyNotBlacklisted
        requireNotBlacklisted(from)
    {
        super.burnFrom(from, value);
    }

    /**
     * @dev Increase the amount of tokens that an owner allows a spender
     * @param spender The address which will spend the funds
     * @param addedValue The amount of tokens to increase the allowance by
     * @return a boolean that indicated if the operation was successful
     */
    function increaseAllowance(address spender, uint256 addedValue)
        public
        returns (bool)
    {
        return super.increaseAllowance(spender, addedValue);
    }

    /**
     * @dev Decrease the amount of tokens that an owner allowed to a spender
     * @param spender The address which will spend the funds
     * @param subtractedValue The amount of tokens to decrease the allowance by
     * @return a boolean that indicated if the operation was successful
     */
    function decreaseAllowance(address spender, uint256 subtractedValue)
        public
        returns (bool)
    {
        return super.decreaseAllowance(spender, subtractedValue);
    }

    /**
     * @dev Gets the current transaction fees
     * @return an uint256 that represents
     * the current transaction fees
     */
    function getFees(uint256 value) public view returns (uint256, bool) {
        return formula.getTxFees(value, address(0), address(0));
    }

    /**
     * @dev Gets the current transaction fees
     * @return an uint256 that represents
     * the current transaction fees
     */
    function getFees(
        uint256 value,
        address sender,
        address recipient
    ) public view returns (uint256, bool) {
        return formula.getTxFees(value, sender, recipient);
    }

    /**
     * @dev Sets the address that receives the transactional fees.
     * can only be called by owner
     * @param _feeRecipient The new address to receive transactional fees
     */
    function setFeeRecipient(address _feeRecipient) public onlyOwner {
        feeRecipient = _feeRecipient;
    }

    /**
     * @dev Sends transactional fees to feeRecipient address from given address
     * @param account The account that sends the fees
     * @param value The amount to subtract fees from
     * @return an uint256 that represents the given value minus the transactional fees
     */
    function processFees(
        address account,
        address recipient,
        uint256 value
    ) internal returns (uint256) {
        (uint256 txFees, bool senderPays) = getFees(value, account, recipient);
        if (txFees > 0 && !identity.isDAOContract(msg.sender)) {
            require(
                senderPays == false || value.add(txFees) <= balanceOf(account),
                "Not enough balance to pay TX fee"
            );
            if (account == msg.sender) {
                super.transfer(feeRecipient, txFees);
            } else {
                super.transferFrom(account, feeRecipient, txFees);
            }

            return senderPays ? value : value.sub(txFees);
        }
        return value;
    }
}