// File: /Users/foolsogood/Documents/code/blockchain/demo/server/contracts/Vote.sol



// SPDX-License-Identifier: MIT

pragma solidity >=0.7.0 <0.9.0;
pragma experimental ABIEncoderV2;
import "@openzeppelin/contracts/access/Ownable.sol";

contract Vote is Ownable {
    struct Person {
        string name;
        address addr;
        uint256 secore;
    }
    uint256 public index = 0;
    mapping(address => Person) public campaigners;
    mapping(address => address) public personVoteRecord;
    address[] public list;

    function find(address[] memory arr, address target)
        public
        pure
        returns (bool)
    {
        uint256 len = arr.length;
        for (uint256 i = 0; i < len; i++) {
            address _a = arr[i];
            if (address(_a) == address(target)) {
                return true;
            }
        }
        return false;
    }

    function addCampaigner(string memory _name, address _addr)
        public
        onlyOwner
        returns (bool)
    {
        bool flag = find(list, _addr);
        require(flag == false, "You had added already!!");
        Person memory p = Person(_name, _addr, 0);
        index++;
        list.push(_addr);
        campaigners[_addr] = p;
        return true;
    }

    function vote(address _addr) public {
        require(
            personVoteRecord[msg.sender] == address(0),
            "You had voted already!!"
        );
        personVoteRecord[msg.sender] = _addr;
        uint256 len = list.length;
        for (uint256 i = 0; i < len; i++) {
            address _campaigner = list[i];
            Person storage item = campaigners[_campaigner];
            address itemAddr = item.addr;
            if (itemAddr == _addr) {
                item.secore++;
                break;
            }
        }
    }
}

// File: @openzeppelin/contracts/utils/Context.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^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 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) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol



// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.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.
 */
abstract contract Ownable is Context {
    address private _owner;

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

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

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

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the 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 onlyOwner {
        _transferOwnership(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 onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}