using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using MySql.Data.MySqlClient;
using RMuseum.DbContext;
using RMuseum.Models.GanjoorAudio;
using RMuseum.Models.GanjoorAudio.ViewModels;
using RSecurityBackend.Models.Generic;
using RSecurityBackend.Services.Implementation;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Threading.Tasks;

namespace RMuseum.Services.Implementation
{

    /// <summary>
    /// Audio Narration Service Implementation
    /// </summary>
    public class AudioNarrationService : IAudioNarrationService
    {
        /// <summary>
        /// returns list of narrations
        /// </summary>
        /// <param name="paging"></param>
        /// <param name="filteredUserId">send Guid.Empty if you want all narrations</param>
        /// <param name="status"></param>
        /// <returns></returns>
        public async Task<RServiceResult<(PaginationMetadata PagingMeta, PoemNarrationViewModel[] Items)>> GetAll(PagingParameterModel paging, Guid filteredUserId, AudioReviewStatus status)
        {
            try
            {
                var source =
                    
                     _context.AudioFiles
                     .Include(a => a.Owner)
                     .Where(a => 
                            (filteredUserId == Guid.Empty || a.OwnerId == filteredUserId)
                            &&
                            (status == AudioReviewStatus.All || a.ReviewStatus == status)
                     )
                    .OrderBy(a => a.UploadDate)
                    .AsQueryable();

                (PaginationMetadata PagingMeta, PoemNarration[] Items) paginatedResult =
                    await QueryablePaginator<PoemNarration>.Paginate(source, paging);

                List<PoemNarrationViewModel> res = new List<PoemNarrationViewModel>();
                foreach(PoemNarration audio in paginatedResult.Items)
                {
                    res.Add(new PoemNarrationViewModel(audio));
                }

                return new RServiceResult<(PaginationMetadata PagingMeta, PoemNarrationViewModel[] Items)>((paginatedResult.PagingMeta, res.ToArray()));
            }
            catch (Exception exp)
            {
                return new RServiceResult<(PaginationMetadata PagingMeta, PoemNarrationViewModel[] Items)>((PagingMeta: null, Items: null), exp.ToString());
            }
        }

        /// <summary>
        /// imports data from ganjoor MySql database
        /// </summary>
        /// <param name="OwnrRAppUserId">User Id which becomes owner of imported data</param>
        public async Task<RServiceResult<bool>> OneTimeImport(Guid OwnrRAppUserId)
        {
            try
            {
                PoemNarration sampleCheck = await _context.AudioFiles.FirstOrDefaultAsync();
                if(sampleCheck != null)
                {
                    return new RServiceResult<bool>(false, "OneTimeImport is a one time operation and cannot be called multiple times.");
                }
                using (MySqlConnection connection = new MySqlConnection
                    (
                    $"server={Configuration.GetSection("AudioMySqlServer")["Server"]};uid={Configuration.GetSection("AudioMySqlServer")["Username"]};pwd={Configuration.GetSection("AudioMySqlServer")["Password"]};database={Configuration.GetSection("AudioMySqlServer")["Database"]};charset=utf8"
                    ))
                {
                    connection.Open();
                    using(MySqlDataAdapter src = new MySqlDataAdapter(
                        "SELECT audio_ID, audio_post_ID, audio_order, audio_xml, audio_ogg, audio_mp3, " +
                        "audio_title,  audio_artist, audio_artist_url, audio_src,  audio_src_url, audio_guid, " +
                        "audio_fchecksum,  audio_mp3bsize,  audio_oggbsize,  audio_date " +
                        "FROM adab.ganja_gaudio ORDER BY audio_ID",
                        connection
                        ))
                    {
                        using(DataTable srcData = new DataTable())
                        {
                            await src.FillAsync(srcData);

                            int audioSyncStatus = (int)AudioSyncStatus.SynchronizedOrRejected;
                            foreach (DataRow row in srcData.Rows)
                            {
                                PoemNarration newRecord = new PoemNarration()
                                {
                                    OwnerId = OwnrRAppUserId,
                                    GanjoorAudioId = int.Parse(row["audio_ID"].ToString()),
                                    GanjoorPostId = (int)row["audio_post_ID"],
                                    AudioOrder = (int)row["audio_order"],
                                    AudioTitle = row["audio_title"].ToString(),
                                    AudioArtist = row["audio_artist"].ToString(),
                                    AudioArtistUrl = row["audio_artist_url"].ToString(),
                                    AudioSrc = row["audio_src"].ToString(),
                                    AudioSrcUrl = row["audio_src_url"].ToString(),
                                    LegacyAudioGuid = new Guid(row["audio_guid"].ToString()),
                                    Mp3FileCheckSum = row["audio_fchecksum"].ToString(),
                                    Mp3SizeInBytes = (int)row["audio_mp3bsize"],
                                    OggSizeInBytes = (int)row["audio_oggbsize"],
                                    UploadDate = (DateTime)row["audio_date"],
                                    AudioSyncStatus = audioSyncStatus,
                                    ReviewStatus = AudioReviewStatus.Approved
                                };
                                newRecord.ReviewDate = newRecord.UploadDate;
                                string audio_xml = row["audio_xml"].ToString();
                                //sample audio_xml value: /i/a/x/11876-Simorgh.xml
                                audio_xml = audio_xml.Substring("/i/".Length); // /i/a/x/11876-Simorgh.xml -> a/x/11876-Simorgh.xml
                                newRecord.SoundFilesFolder = audio_xml.Substring(0, audio_xml.IndexOf('/')); //(a)
                                newRecord.FileNameWithoutExtension = Path.GetFileNameWithoutExtension(audio_xml.Substring(audio_xml.LastIndexOf('/') + 1)); //(11876-Simorgh)

                                _context.AudioFiles.Add(newRecord);
                            }
                        }
                        await _context.SaveChangesAsync();
                    }
                }
                return new RServiceResult<bool>(true);
            }
            catch(Exception exp)
            {
                return new RServiceResult<bool>(false, exp.ToString());
            }
           
        }


        /// <summary>
        /// Configuration
        /// </summary>
        protected IConfiguration Configuration { get; }

        /// <summary>
        /// Database Contetxt
        /// </summary>
        protected readonly RMuseumDbContext _context;

        /// <summary>
        /// constructor
        /// </summary>
        /// <param name="context"></param>
        /// <param name="configuration"></param>
        public AudioNarrationService(RMuseumDbContext context, IConfiguration configuration)
        {
            _context = context;
            Configuration = configuration;
        }
    }
}