using System;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.Logging;
using Wabbajack.BuildServer;
using Wabbajack.Common;
using Wabbajack.Downloaders;
using Wabbajack.DTOs;
using Wabbajack.DTOs.JsonConverters;
using Wabbajack.Installer;
using Wabbajack.Networking.WabbajackClientApi;
using Wabbajack.Paths.IO;
using Wabbajack.Server.DataLayer;
using Wabbajack.Server.DTOs;

namespace Wabbajack.Server.Services;

public class ModListDownloader : AbstractService<ModListDownloader, int>
{
    private readonly DownloadDispatcher _dispatcher;
    private readonly DTOSerializer _dtos;
    private readonly TemporaryFileManager _manager;
    private readonly Client _wjClient;
    private readonly DiscordWebHook _discord;
    private readonly ArchiveMaintainer _maintainer;
    private readonly SqlService _sql;

    public ModListDownloader(ILogger<ModListDownloader> logger, AppSettings settings, ArchiveMaintainer maintainer,
        SqlService sql, DiscordWebHook discord, QuickSync quickSync, Client wjClient, TemporaryFileManager manager,
        DownloadDispatcher dispatcher, DTOSerializer dtos)
        : base(logger, settings, quickSync, TimeSpan.FromMinutes(1))
    {
        _logger = logger;
        _settings = settings;
        _maintainer = maintainer;
        _sql = sql;
        _discord = discord;
        _wjClient = wjClient;
        _manager = manager;
        _dispatcher = dispatcher;
        _dtos = dtos;
    }


    public override async Task<int> Execute()
    {
        var downloaded = 0;
        var lists = await _wjClient.LoadLists();

        foreach (var list in lists)
            try
            {
                ReportStarting(list.Links.MachineURL);
                if (await _sql.HaveIndexedModlist(list.Links.MachineURL, list.DownloadMetadata.Hash))
                    continue;


                if (!_maintainer.HaveArchive(list.DownloadMetadata!.Hash))
                {
                    _logger.Log(LogLevel.Information, $"Downloading {list.Links.MachineURL}");
                    await _discord.Send(Channel.Ham,
                        new DiscordMessage
                        {
                            Content = $"Downloading {list.Links.MachineURL} - {list.DownloadMetadata.Hash}"
                        });
                    var tf = _manager.CreateFile();
                    var state = _dispatcher.Parse(new Uri(list.Links.Download));
                    if (state == null)
                    {
                        _logger.Log(LogLevel.Error,
                            $"Now downloader found for list {list.Links.MachineURL} : {list.Links.Download}");
                        continue;
                    }

                    downloaded += 1;
                    await _dispatcher.Download(new Archive {State = state, Name = $"{list.Links.MachineURL}.wabbajack"},
                        tf.Path, CancellationToken.None);
                    var hash = await tf.Path.Hash();
                    if (hash != list.DownloadMetadata.Hash)
                    {
                        _logger.Log(LogLevel.Error,
                            $"Downloaded modlist {list.Links.MachineURL} {list.DownloadMetadata.Hash} didn't match metadata hash of {hash}");
                        await _sql.IngestModList(list.DownloadMetadata.Hash, list, new ModList(), true);
                        continue;
                    }

                    await _maintainer.Ingest(tf.Path);
                }

                _maintainer.TryGetPath(list.DownloadMetadata.Hash, out var modlistPath);
                ModList modlist;

                modlist = await StandardInstaller.LoadFromFile(_dtos, modlistPath);

                await _discord.Send(Channel.Ham,
                    new DiscordMessage
                    {
                        Content = $"Ingesting {list.Links.MachineURL} version {modlist.Version}"
                    });
                await _sql.IngestModList(list.DownloadMetadata!.Hash, list, modlist, false);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, $"Error downloading modlist {list.Links.MachineURL}");
                await _discord.Send(Channel.Ham,
                    new DiscordMessage
                    {
                        Content =
                            $"Error downloading modlist {list.Links.MachineURL} - {list.DownloadMetadata.Hash} - {ex.Message}"
                    });
            }
            finally
            {
                ReportEnding(list.Links.MachineURL);
            }

        _logger.Log(LogLevel.Information, $"Done checking modlists. Downloaded {downloaded} new lists");
        if (downloaded > 0)
            await _discord.Send(Channel.Ham,
                new DiscordMessage {Content = $"Downloaded {downloaded} new lists"});

        var fc = await _sql.EnqueueModListFilesForIndexing();
        _logger.Log(LogLevel.Information, $"Enqueing {fc} files for downloading");
        if (fc > 0)
            await _discord.Send(Channel.Ham,
                new DiscordMessage {Content = $"Enqueing {fc} files for downloading"});

        return downloaded;
    }
}

public static class ModListDownloaderExtensions
{
    public static void UseModListDownloader(this IApplicationBuilder b)
    {
        var poll = (ModListDownloader) b.ApplicationServices.GetService(typeof(ModListDownloader));
        poll.Start();
    }
}