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pragma solidity ^0.7.0;

contract DStock{
    
    uint public assetCount;
    uint public personCount;
    uint public transactionCount;
    
    struct asset{
        uint assetId;
        string hash;
        address creatorAddress;
        uint cost;
        uint soldCount;
    }
    
    struct person{
        uint personId;
        address personAddress;
        uint earning;
        uint tokenCount;
        uint[] assetsUploaded;
        uint[] assetsBought;
        bool initialized;
    }
    
    mapping (uint => asset) public assets;
    mapping (uint => person) public persons;
    mapping  (address=> uint) public  getMyId;
    
    function initializePerson() private {
        if(persons[getMyId[msg.sender]].initialized == true) { return; }
        persons[personCount].personId = personCount;
        persons[personCount].personAddress = msg.sender;
        persons[personCount].earning= 0;
        persons[personCount].tokenCount = 0 ;
        persons[personCount].initialized = true;
        persons[personCount].assetsUploaded = new uint[](0);
        getMyId[msg.sender] = personCount;
        personCount++;
    }
    
    
    function uploadAsset(string memory _hash, uint _cost) public returns(uint256[] memory){
        initializePerson();
        assets[assetCount] = asset(assetCount,_hash,msg.sender,_cost,0);
        persons[getMyId[msg.sender]].assetsUploaded.push(assetCount);
        assetCount++;
        return persons[getMyId[msg.sender]].assetsUploaded;
    }
    
    function buyAsset(uint _assetId) public {
        initializePerson();
        // transfer tokens = assets[_assetId].cost from msg.sender to assets[_assetId].creatorAddress
        assets[_assetId].soldCount++;
        persons[getMyId[msg.sender]].assetsBought.push(_assetId);
        transactionCount++;
        
    }
}