namespace MusicSystem.Services.Controllers
{
    using MusicSystem.Data;
using MusicSystem.Data.Repositories;
using MusicSystem.Entities;
using MusicSystem.Services.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;

    public class SongsController : ApiController
    {
        private IMusicSystemData data;

        public SongsController()
            :this(new MusicSystemData())
        {
        }

        public SongsController(IMusicSystemData data)
        {
            this.data = data;
        }

        [HttpGet]
        public IHttpActionResult All()
        {
            var songs = this.data.Songs.All().Select(SongModel.FromSong);
            return Ok(songs);
        }

        [HttpPost]
        public IHttpActionResult Create(SongModel song)
        {
            if (!this.ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            var newSong = new Song
            {
                Title = song.Title,
                Year = song.Year,
                Genre = song.Genre,
                ArtistId = song.ArtistId
            };

            this.data.Songs.Add(newSong);
            this.data.Songs.SaveChanges();

            song.Id = newSong.Id;
            return Ok(song);
        }

        [HttpPut]
        public IHttpActionResult Update(int id, SongModel song)
        {
            if (!this.ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

            var existingSong = this.data.Songs.All().FirstOrDefault(s => s.Id == id);
            if (existingSong == null)
            {
                return BadRequest("Such song does not exists!");
            }

            existingSong.Title = song.Title;
            existingSong.Year = song.Year;
            existingSong.Genre = song.Genre;
            existingSong.ArtistId = song.ArtistId;
            this.data.Songs.SaveChanges();
            song.Id = id;

            return Ok(song);
        }

        [HttpDelete]
        public IHttpActionResult Delete(int id)
        {
            // create find method in repository later
            var existingSong = this.data.Songs.All().FirstOrDefault(s => s.Id == id);
            if (existingSong == null)
            {
                return BadRequest("Such song does not exists!");
            }

            this.data.Songs.Delete(existingSong);
            this.data.Songs.SaveChanges();

            return Ok();
        }
    }
}