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VehicleManagement.sol

pragma solidity ^0.4.21;

contract Vehicles{
    
    struct Person {
        address owner;
        string yearOfRegis;
        string etag_id;
    }
    
    struct Vehicle{
        string plate_id;
        Person[] persons;
        uint256 lenghtPerson;
        string name;
        string typeOfVehicle;
        string color;
        string yearOfPro;
        string charactic;
        string manufac;
        string serial;
        string status; //active, deactive, stolen.
    }
    
    
    mapping (string => Vehicle) vehicles;
    mapping (address => address) permissionList;

    
    string[] public vehiclesList;
    
    function checkOwner(address _owner, string _plate_id) public view returns(bool){
         if (vehicles[_plate_id].persons[vehicles[_plate_id].lenghtPerson -1 ].owner != _owner){
            return (false);
        }
        else{
            return (true);
        }
    }
    
    function checkPermission() public view returns(bool){
    if (permissionList[msg.sender] == address(0)) {
            return false;
        }
        else{
            return true;
        }
    }
    
    function addPermission(address _address) public{
        address newOwner = permissionList[_address];
        permissionList[_address]= newOwner;
    }
    
    function addVehicle(address _owner, string _plate_id, string _name, string _type, string _color, string _yearOfPro, string _yearOfRegis, string _charac, string _manufac, string _serial, string _etag_id) public returns (bool){
        if (!checkPermission()){
            return false;
        }
        else{
        Vehicle storage vehicle = vehicles[_plate_id];
        Person storage p = vehicle.persons[vehicle.lenghtPerson] ;
        p.owner = _owner;
        p.yearOfRegis= _yearOfRegis;
        p.etag_id = _etag_id;
        
        vehicle.persons[vehicle.lenghtPerson] = p;
        vehicle.plate_id = _plate_id;
        vehicle.name = _name;
        vehicle.typeOfVehicle = _type;
        vehicle.color = _color;
        vehicle.yearOfPro = _yearOfPro;
        vehicle.charactic = _charac;
        vehicle.manufac = _manufac;
        vehicle.serial = _serial;
        vehicle.status = "active";
        vehicle.lenghtPerson++;
        vehiclesList.push(_plate_id) -1;
        return true;
    }
}
    function changeOwner(string _plate_id, address _owner, address _new_owner, string _yearOfRegis, string _etag_id) public returns (bool){
       if (!checkPermission()){
            return false;
        }
        
       if (!checkOwner(_owner, _plate_id)){
           return false;
       }
        else{
              Person storage p = vehicles[_plate_id].persons[vehicles[_plate_id].lenghtPerson] ;
              p.owner = _new_owner;
              p.yearOfRegis = _yearOfRegis;
              p.etag_id = _etag_id;
              vehicles[_plate_id].lenghtPerson ++;
              return true;
        }
    }
    
    function renewEtagID(string _plate_id, address _owner) public view returns(bool, string){
        if (!checkPermission()){
            return (false, "");
        }
        
        if (!checkOwner(_owner, _plate_id)){
            return (false, "");
        }
        else{
            string storage _etag_id = vehicles[_plate_id].persons[vehicles[_plate_id].lenghtPerson -1 ].etag_id;
            return (true, _etag_id);
        }
    }
    
    
    function changeStatus(string _plate_id, address _owner, string _status) public returns(bool){
        if (!checkPermission()){
            return false;
        }
        
        if (!checkOwner(_owner, _plate_id)){
            return false;
        }
        else{
            vehicles[_plate_id].status = _status;
            return (true);
        }
    }

    function getFixedInfo(string _plate_id) view public returns (string, string, string, string, string) {
        return(vehicles[_plate_id].name, vehicles[_plate_id].typeOfVehicle, vehicles[_plate_id].yearOfPro, vehicles[_plate_id].manufac, vehicles[_plate_id].serial);
    }

    function getDynamicInfo(string _plate_id) view public returns (address, string, string, string, string){
        address _owner = vehicles[_plate_id].persons[vehicles[_plate_id].lenghtPerson].owner;
        string storage _yearOfRegis = vehicles[_plate_id].persons[vehicles[_plate_id].lenghtPerson].yearOfRegis;
        return (_owner, _yearOfRegis , vehicles[_plate_id].color, vehicles[_plate_id].charactic, vehicles[_plate_id].status);
    }
}