using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http.Headers;
using System.Web;
using System.Threading.Tasks;

using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;

using Icarus.Models;
using Icarus.Controllers.Managers;
using Icarus.Database.Contexts;

namespace Icarus.Controllers.V1
{
    [Route("api/v1/song/stream")]
    [ApiController]
    public class SongStreamController : ControllerBase
    {
        #region Fields
        private ILogger<SongStreamController> _logger;
        private string _connectionString;
        private IConfiguration _config;
        #endregion


        #region Properties
        #endregion


        #region Constructor
        public SongStreamController(ILogger<SongStreamController> logger, IConfiguration config)
        {
            _logger = logger;
            _config = config;
            _connectionString = _config.GetConnectionString("DefaultConnection");
        }
        #endregion


        private string ParseBearerTokenFromHeader()
        {
            var token = string.Empty;
            const string tokenType = "Bearer";

            var req = Request;
            var auth = req.Headers.Authorization; 
            var val = auth.ToString();

            if (val.Contains(tokenType) && val.Split(" ").Count() > 1)
            {
                var split = val.Split(" ");
                token = split[1];
            }


            return token;
        }

        #region HTTP endpoints
        [HttpGet("{id}")]
        // [Authorize("stream:songs")]
        public async Task<IActionResult> Get(int id)
        {
            var token = ParseBearerTokenFromHeader();
            var tokMgr = new TokenManager(_config);

            /**
            if (!tokMgr.IsTokenValid("stream:songs", token))
            {
                return StatusCode(401, "Not allowed");
            }
            */

            var context = new SongContext(_config.GetConnectionString("DefaultConnection"));

            var song = context.Songs.FirstOrDefault(sng => sng.SongID == id);

            var stream = new FileStream(song.SongPath(), FileMode.Open, FileAccess.Read);
            stream.Position = 0;
            var filename = $"{song.Title}.mp3";

            _logger.LogInformation("Starting to stream song...>");
            Console.WriteLine("Starting to streamsong...");

            var file = await Task.Run(() => {
                return File(stream, "application/octet-stream", filename);
            });

            return file;
        }
        #endregion
    }
}