Contract 0x3D0d6956c6a286Aa0eCC9ed90b2a505278d7E98D

/**
 *Submitted for verification at Etherscan.io on 2019-05-03
*/

pragma solidity ^0.5.0;

pragma solidity ^0.5.0;

/**
 * @title SafeMath
 * @dev Unsigned math operations with safety checks that revert on error.
 */
library SafeMath {
    /**
     * @dev Multiplies two unsigned integers, reverts on overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (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-solidity/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        // Solidity only automatically asserts when dividing by 0
        require(b > 0, "SafeMath: division by zero");
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b <= a, "SafeMath: subtraction overflow");
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Adds two unsigned integers, reverts on overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
     * reverts when dividing by zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        require(b != 0, "SafeMath: modulo by zero");
        return a % b;
    }
}

pragma solidity ^0.5.0;

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
    address private _owner;

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

    /**
     * @dev The Ownable constructor sets the original `owner` of the contract to the sender
     * account.
     */
    constructor () internal {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), _owner);
    }

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

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

    /**
     * @return true if `msg.sender` is the owner of the contract.
     */
    function isOwner() public view returns (bool) {
        return msg.sender == _owner;
    }

    /**
     * @dev Allows the current owner to relinquish control of the contract.
     * It will not be possible to call the functions with the `onlyOwner`
     * modifier anymore.
     * @notice Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Allows the current owner to transfer control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function transferOwnership(address newOwner) public onlyOwner {
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers control of the contract to a newOwner.
     * @param newOwner The address to transfer ownership to.
     */
    function _transferOwnership(address newOwner) internal {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}


/////////////////////Active Citizen project voting smart contract for Yerevan city.
//Developed by “Center for management technologies of Yerevan” CJSC for Yerevan City 2019
//Holds all projects and all votes from citizens for them irrevertably.
contract YerevanVotes is Ownable {
    
    using SafeMath for uint256;

    struct Project { //Placeholder for each project that needs to be voted
        
        uint256[] votedIDs; //Citizen id list that voted on the project
        mapping(uint256 => bool) idVoted; //Indicate if citizen already voted
        mapping(uint256 => uint256) idsVote; //The vote value for the Citizen 
        mapping(uint256 => uint256) voteDate; //When did the Citizen voted
        uint256 voteCount; //Overall count of Votes for the project
        uint256 likes; //Overall count of likes on the project
        uint256 dislikes; //Overall count of dislikes for the project.
        string shortDescribtion; //Short describtion of the project
        uint256 projectCreationDate; //Project creation date on blockchain
        bool isActive; //If the project is active for votes
    }
    
    mapping (uint256 => Project) public projects; //Mapping of all projects by their number
    uint256[] public projectList; //Reverse lookup for project list by array
    
    //Adds new project for voting
    function addProject(uint256 projectID, string memory shortDescribtion) public onlyOwner { 
        
        require(0 == projects[projectID].projectCreationDate, "Error: Project already exists.");
        
        projects[projectID].isActive = true;
        projects[projectID].shortDescribtion = shortDescribtion;
        projects[projectID].projectCreationDate = now;
        projectList.push(projectID);

    }
    
    //Votes on a project for user
    function vote(uint256 projectID, uint256 citizenID, uint256 citizenVote) public onlyOwner {
        
        require(true == projects[projectID].isActive, "Error: Project is inactive.");
        require(0 != projects[projectID].projectCreationDate, "Error: Project does not exist.");
        require(false == projects[projectID].idVoted[citizenID], "Error: Citizen already voted.");
        
        if(citizenVote == 1) {
            projects[projectID].dislikes++;
        }
        else if(citizenVote == 2) {
            projects[projectID].likes++;
        }
        projects[projectID].voteCount++;
        
        projects[projectID].idsVote[citizenID] = citizenVote;
        projects[projectID].idVoted[citizenID] = true;
        projects[projectID].voteDate[citizenID] = now;
        projects[projectID].votedIDs.push(citizenID);
        
    }
    
    //Gets all basic information for project status
    function getProjectData(uint256 projectID) public view returns(
                                                    uint256 voteCount, 
                                                    uint256 likes, 
                                                    uint256 dislikes, 
                                                    string memory shortDescribtion,
                                                    uint256 projectCreationDate,
                                                    bool isActive) {
                                                        
        return (projects[projectID].voteCount,
                projects[projectID].likes,
                projects[projectID].dislikes,
                projects[projectID].shortDescribtion,
                projects[projectID].projectCreationDate,
                projects[projectID].isActive);
        
    }
    
    //For the given project returns vote value and time of the citizen
    function getCitizensVote(uint256 projectID, uint256 citizenID) public view returns(uint256 idsVote, uint256 voteDate) {
        require(true == projects[projectID].idVoted[citizenID], "Citizen did not voted");
        return(projects[projectID].idsVote[citizenID], projects[projectID].voteDate[citizenID]);
    }
    
    //Gets all citizens that voted on project
    function getVotedIDs(uint256 projectID) public view returns(uint256[] memory votedIDs) { 
    
        return projects[projectID].votedIDs;
    }
    
    //Gets the list of all projects that have been added
    function getAllProjects() public view returns(uint256[] memory projectIDs) { 
    
        return projectList;
    }
    
    //Activates inactivates project
    function setProjectActivity(uint256 projectID, bool isActive) public onlyOwner {
        require(0 != projects[projectID].projectCreationDate, "Error: Project does not exist.");
        projects[projectID].isActive = isActive;
    }
    
    //TODO maybe add a lookup for each citizen's all votes in future.
    //TODO maybe add event logs in future.
    
}

[{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"projects","outputs":[{"name":"voteCount","type":"uint256"},{"name":"likes","type":"uint256"},{"name":"dislikes","type":"uint256"},{"name":"shortDescribtion","type":"string"},{"name":"projectCreationDate","type":"uint256"},{"name":"isActive","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"projectID","type":"uint256"},{"name":"shortDescribtion","type":"string"}],"name":"addProject","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"projectID","type":"uint256"}],"name":"getProjectData","outputs":[{"name":"voteCount","type":"uint256"},{"name":"likes","type":"uint256"},{"name":"dislikes","type":"uint256"},{"name":"shortDescribtion","type":"string"},{"name":"projectCreationDate","type":"uint256"},{"name":"isActive","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"projectList","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"projectID","type":"uint256"}],"name":"getVotedIDs","outputs":[{"name":"votedIDs","type":"uint256[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getAllProjects","outputs":[{"name":"projectIDs","type":"uint256[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"projectID","type":"uint256"},{"name":"citizenID","type":"uint256"},{"name":"citizenVote","type":"uint256"}],"name":"vote","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"isOwner","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"projectID","type":"uint256"},{"name":"citizenID","type":"uint256"}],"name":"getCitizensVote","outputs":[{"name":"idsVote","type":"uint256"},{"name":"voteDate","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"projectID","type":"uint256"},{"name":"isActive","type":"bool"}],"name":"setProjectActivity","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"previousOwner","type":"address"},{"indexed":true,"name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"}]

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