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

/**
 * @title Basic.
 * @dev Deposit & Withdraw from DSA.
 */

import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/SafeERC20.sol";
import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";

import { DSMath } from "../../common/math.sol";
import { Basic } from "../../common/basic.sol";
import { Events } from "./events.sol";

abstract contract BasicResolver is Events, DSMath, Basic {
    using SafeERC20 for IERC20;

    /**
     * @dev Deposit Assets To Smart Account.
     * @notice Deposit a token to DSA. 
     * @param token The address of the token to deposit.<br>(For <b>ETH</b>: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE and need to pass `value` parameter equal to `amt` in cast function ```dsa.cast({..., value: amt})```.<br>For <b>ERC20</b>: Need to give allowance prior casting spells.)
     * @param amt The amount of tokens to deposit. (For max: `uint256(-1)` (Not valid for ETH))
     * @param getId ID to retrieve amt.
     * @param setId ID stores the amount of tokens deposited.
     */
    function deposit(
        address token,
        uint256 amt,
        uint256 getId,
        uint256 setId
    ) public payable returns (string memory _eventName, bytes memory _eventParam) {
        uint _amt = getUint(getId, amt);
        if (token != ethAddr) {
            IERC20 tokenContract = IERC20(token);
            _amt = _amt == uint(-1) ? tokenContract.balanceOf(msg.sender) : _amt;
            tokenContract.safeTransferFrom(msg.sender, address(this), _amt);
        } else {
            require(msg.value == _amt || _amt == uint(-1), "invalid-ether-amount");
            _amt = msg.value;
        }
        setUint(setId, _amt);

        _eventName = "LogDeposit(address,uint256,uint256,uint256)";
        _eventParam = abi.encode(token, _amt, getId, setId);
    }

    /**
     * @dev Deposit Assets To Smart Account From any user.
     * @notice Deposit a token to DSA from any user. 
     * @param token The address of the token to deposit. (Note: ETH is not supported. Use `deposit()`)
     * @param amt The amount of tokens to deposit. (For max: `uint256(-1)`)
     * @param from The address depositing the token.
     * @param getId ID to retrieve amt.
     * @param setId ID stores the amount of tokens deposited.
     */
    function depositFrom(
        address token,
        uint256 amt,
        address from,
        uint256 getId,
        uint256 setId
    ) public payable returns (string memory _eventName, bytes memory _eventParam) {
        uint _amt = getUint(getId, amt);
        require(token != ethAddr, "eth-not-supported");
        IERC20 tokenContract = IERC20(token);
        _amt = _amt == uint(-1) ? tokenContract.balanceOf(from) : _amt;
        tokenContract.safeTransferFrom(from, address(this), _amt);
        
        setUint(setId, _amt);

        _eventName = "LogDepositFrom(address,uint256,address,uint256,uint256)";
        _eventParam = abi.encode(token, _amt, from, getId, setId);
    }

    /**
     * @dev Withdraw Assets from Smart  Account
     * @notice Withdraw a token from DSA
     * @param token The address of the token to withdraw. (For ETH: 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE)
     * @param amt The amount of tokens to withdraw. (For max: `uint256(-1)`)
     * @param to The address to receive the token upon withdrawal
     * @param getId ID to retrieve amt.
     * @param setId ID stores the amount of tokens withdrawn.
     */
    function withdraw(
        address token,
        uint amt,
        address payable to,
        uint getId,
        uint setId
    ) public payable returns (string memory _eventName, bytes memory _eventParam) {
        uint _amt = getUint(getId, amt);
        if (token == ethAddr) {
            _amt = _amt == uint(-1) ? address(this).balance : _amt;
            to.call{value: _amt}("");
        } else {
            IERC20 tokenContract = IERC20(token);
            _amt = _amt == uint(-1) ? tokenContract.balanceOf(address(this)) : _amt;
            tokenContract.safeTransfer(to, _amt);
        }
        setUint(setId, _amt);

        _eventName = "LogWithdraw(address,uint256,address,uint256,uint256)";
        _eventParam = abi.encode(token, _amt, to, getId, setId);
    }
}

contract ConnectV2Basic is BasicResolver {
    string constant public name = "Basic-v1.1";
}