using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using YTManager;
using YTManager.Models;

namespace YTManager.Controllers {
    [Produces("application/json")]
    [Route("api/Videos")]
    public class VideosController : Controller {
        // DB context used for all these calls.
        private readonly MediaDB db;

        // Constructor to fetch the db context.
        public VideosController(MediaDB context) => db = context;

        // GET: api/Videos
        [HttpGet]
        public async Task<List<Video>> GetVideos() {
            return await db.Videos.OrderByDescending(i => i.AddedtoDB).ToListAsync();
        }

        // GET: api/Videos/5
        [HttpGet("{id}")]
        public async Task<IActionResult> GetVideo([FromRoute] long id){
            // Check if we were able to parse.
            if (!ModelState.IsValid) return BadRequest(ModelState);

            // Attempt to get the video from the database.
            var video = await db.Videos.SingleOrDefaultAsync(m => m.PrimaryKey == id);

            // If the video wasn't found then send back not foud.
            if (video == null)
                return NotFound();
            else
                return Ok(video);
        }

        // POST: api/Videos
        [HttpPost]
        public async Task<IActionResult> PostVideo([FromBody] Video video){
            // Check if we were able to parse.
            if (!ModelState.IsValid) return BadRequest(ModelState);

            // Check if such a database exists already.
            if (await db.Videos.AnyAsync(d => d.YoutubeID == video.YoutubeID))
                return BadRequest();

            // Add our video to the database and tell db to update.
            db.Videos.Add(video);
            await db.SaveChangesAsync();

            // Say that the creation was succesfull.
            return Ok();
        }

        // DELETE: api/Videos/alfkeo4f5
        [HttpDelete("{ytid}")]
        public async Task<IActionResult> DeleteVideo([FromRoute] string YTVideoID){
            // Check if we were able to parse.
            if (!ModelState.IsValid) return BadRequest(ModelState);

            // Attempt to find the video.
            var video = await db.Videos.SingleOrDefaultAsync(m => m.YoutubeID == YTVideoID);

            // Check if such a database exists already.
            if (video == null)
                return NotFound();

            // Remove.
            db.Videos.Remove(video);
            await db.SaveChangesAsync();
            return Ok(video);
        }
    }
}