contract SavingAccount is Initializable, InitializableReentrancyGuard, Constant, InitializablePausable {
    using SafeERC20 for IERC20;
    using SafeMath for uint256;

    GlobalConfig public globalConfig;

    address public constant FIN_ADDR = 0x576c990A8a3E7217122e9973b2230A3be9678E94;
    address public constant COMP_ADDR = address(0);

    event Transfer(address indexed token, address from, address to, uint256 amount);
    event Borrow(address indexed token, address from, uint256 amount);
    event Repay(address indexed token, address from, uint256 amount);
    event Deposit(address indexed token, address from, uint256 amount);
    event Withdraw(address indexed token, address from, uint256 amount);
    event WithdrawAll(address indexed token, address from, uint256 amount);
    event Liquidate(address liquidator, address borrower, address borrowedToken, uint256 repayAmount, address collateralToken, uint256 payAmount);
    event Claim(address from, uint256 amount);
    event WithdrawCOMP(address beneficiary, uint256 amount);

    modifier onlySupportedToken(address _token) {
        if(_token != ETH_ADDR) {
            require(globalConfig.tokenInfoRegistry().isTokenExist(_token), "Unsupported token");
        }
        _;
    }

    modifier onlyEnabledToken(address _token) {
        require(globalConfig.tokenInfoRegistry().isTokenEnabled(_token), "The token is not enabled");
        _;
    }

    modifier onlyAuthorized() {
        require(msg.sender == address(globalConfig.bank()),
            "Only authorized to call from DeFiner internal contracts.");
        _;
    }

    modifier onlyOwner() {
        require(msg.sender == GlobalConfig(globalConfig).owner(), "Only owner");
        _;
    }

    /**
     * Initialize function to be called by the Deployer for the first time
     * @param _tokenAddresses list of token addresses
     * @param _cTokenAddresses list of corresponding cToken addresses
     * @param _globalConfig global configuration contract
     */
    function initialize(
        address[] memory _tokenAddresses,
        address[] memory _cTokenAddresses,
        GlobalConfig _globalConfig
    )
        public
        initializer
    {
        // Initialize InitializableReentrancyGuard
        super._initialize();
        super._initialize(address(_globalConfig));

        globalConfig = _globalConfig;

        require(_tokenAddresses.length == _cTokenAddresses.length, "Token and cToken length don't match.");
        uint tokenNum = _tokenAddresses.length;
        for(uint i = 0;i < tokenNum;i++) {
            if(_cTokenAddresses[i] != address(0x0) && _tokenAddresses[i] != ETH_ADDR) {
                approveAll(_tokenAddresses[i]);
            }
        }
    }

    /**
     * Approve transfer of all available tokens
     * @param _token token address
     */
    function approveAll(address _token) public {
        address cToken = globalConfig.tokenInfoRegistry().getCToken(_token);
        require(cToken != address(0x0), "cToken address is zero");
        IERC20(_token).safeApprove(cToken, 0);
        IERC20(_token).safeApprove(cToken, uint256(-1));
    }

    /**
     * Get current block number
     * @return the current block number
     */
    function getBlockNumber() internal view returns (uint) {
        return block.number;
    }

    /**
     * Transfer the token between users inside DeFiner
     * @param _to the address that the token be transfered to
     * @param _token token address
     * @param _amount amout of tokens transfer
     */
    function transfer(address _to, address _token, uint _amount) external onlySupportedToken(_token) onlyEnabledToken(_token) whenNotPaused nonReentrant {

        globalConfig.bank().newRateIndexCheckpoint(_token);
        uint256 amount = globalConfig.accounts().withdraw(msg.sender, _token, _amount);
        globalConfig.accounts().deposit(_to, _token, amount);

        emit Transfer(_token, msg.sender, _to, amount);
    }

    /**
     * Borrow the amount of token from the saving pool.
     * @param _token token address
     * @param _amount amout of tokens to borrow
     */
    function borrow(address _token, uint256 _amount) external onlySupportedToken(_token) onlyEnabledToken(_token) whenNotPaused nonReentrant {

        require(_amount != 0, "Borrow zero amount of token is not allowed.");

        globalConfig.bank().borrow(msg.sender, _token, _amount);

        // Transfer the token on Ethereum
        SavingLib.send(globalConfig, _amount, _token);

        emit Borrow(_token, msg.sender, _amount);
    }

    /**
     * Repay the amount of token back to the saving pool.
     * @param _token token address
     * @param _amount amout of tokens to borrow
     * @dev If the repay amount is larger than the borrowed balance, the extra will be returned.
     */
    function repay(address _token, uint256 _amount) public payable onlySupportedToken(_token) nonReentrant {
        require(_amount != 0, "Amount is zero");
        SavingLib.receive(globalConfig, _amount, _token);

        // Add a new checkpoint on the index curve.
        uint256 amount = globalConfig.bank().repay(msg.sender, _token, _amount);

        // Send the remain money back
        if(amount < _amount) {
            SavingLib.send(globalConfig, _amount.sub(amount), _token);
        }
function getBlockNumber() internal view returns (uint) {
    return block.number;
}

/**
 * Get current block number
 * @return the current block number
 */