// SPDX-License-Identifier: MIT
pragma solidity >=0.4.22 <0.9.0;

import "./Owner.sol";

contract MusiciansManager is Owner{

  event musicianCreated(string _artistName);
  event trackAdded(string _artistName, string _title);
  event getTheTracks(Track[] _tracks);

  struct Track {
    string title;
    uint duration;
  }

  struct Musician {
    string name;
    Track[] tracks;
  }

  mapping (address => Musician) musicians;

  function addMusician(address _address, string memory _name) public isOwner() {
    require(bytes(musicians[_address].name).length == 0, "Musician already exists");
    musicians[_address].name = _name;
    emit musicianCreated(_name);
  }

  function addTrack(address _address, string memory _title, uint _duration) external isOwner() {
    require(bytes(musicians[_address].name).length > 0, "Musician does not exist");
    Track memory thisTrack = Track(_title, _duration);
    musicians[_address].tracks.push(thisTrack);
    emit trackAdded(musicians[_address].name, _title);
  }

  function getTracks(address _address) external {
    emit getTheTracks(musicians[_address].tracks);
  }
}