using Newtonsoft.Json;
using System.Linq;
using System.Diagnostics;

namespace ttrss_co_client
{
    class Program
    {
        static async Task Main(string[] args)
        {
            var conf = Configure();
            var ttrssClient = new ttrss.ApiClient(conf.BaseURI);
            await ttrssClient.Login(conf.Username, conf.Password);

            var loggedin = await ttrssClient.IsLoggedIn();
            Console.WriteLine($"logged in: {loggedin}");

            var miscTasks = new List<Task>();
            var unreadFeeds = await ttrssClient.GetFeeds(cat_id: -3, unread_only: true);
            foreach (var uf in unreadFeeds)
            {
                Console.WriteLine($"unread feed: {uf.title}");
                var headlines = await ttrssClient.GetHeadlines(uf.id, view_mode: ttrss.ApiClient.VIEWMODE.Unread);
                foreach (var hl in headlines)
                {
                    var labelsWRTFeed = (await ttrssClient.GetLabels(hl.id));
                    var actionsForFeed = conf.feedActions.Where(fa =>  
                        labelsWRTFeed.Where(l => l.@checked).Select(l => l.caption).Contains(fa.triggerlabelCaption))?.ToList();
                    if(actionsForFeed != null && actionsForFeed.Any())
                    {
                        foreach(var action in actionsForFeed)
                        {
                            Console.WriteLine($"    {hl.title} -> action: {action.command}");
                            var noteString = hl.note;
                            if (!string.IsNullOrWhiteSpace(noteString))
                            {
                                noteString += $"{hl.note}\n";
                            }
                            switch (action.command)
                            {
                                case "dl":
                                    var stdDLResult = await standardDL(hl.link.ToString());
                                    miscTasks.Add(ttrssClient.UpdateArticleNote($"{noteString}[{DateTime.Now.ToLongTimeString()}] - {stdDLResult.Item2}", hl.id));
                                    if (stdDLResult.Item1 == true)
                                    {
                                        Console.WriteLine($"    {hl.title} -> dl success, removing label");
                                        miscTasks.Add(
                                            ttrssClient.SetArticleLabel(
                                                labelsWRTFeed.First(l => l.caption == action.triggerlabelCaption).id,
                                                false,
                                                hl.id));
                                    }
                                    else
                                    {
                                        Console.WriteLine($"    {hl.title} -> dl failed");
                                    }
                                    break;
                                case "podcastify":
                                    var nameLabel = labelsWRTFeed.FirstOrDefault(l => l.caption?.StartsWith(conf.PodcastTitlePrefix) == true);
                                    var podcastName = nameLabel?.caption.Substring(conf.PodcastTitlePrefix.Length)
                                        ?? hl.feed_title;
                                    var podcastifyResult = await podcastify(hl.link.ToString(), podcastName);
                                    miscTasks.Add(ttrssClient.UpdateArticleNote($"{noteString}[{DateTime.Now.ToLongTimeString()}] - {podcastifyResult.Item2}", hl.id));
                                    if (podcastifyResult.Item1 == true)
                                    {
                                        Console.WriteLine($"    {hl.title} -> podcastify success, removing labels");
                                        miscTasks.Add(
                                            ttrssClient.SetArticleLabel(
                                                labelsWRTFeed.First(l => l.caption == action.triggerlabelCaption).id,
                                                false,
                                                hl.id));
                                        if(nameLabel != null)
                                        {
                                            miscTasks.Add(ttrssClient.SetArticleLabel(nameLabel.id, false, hl.id));
                                        }
                                    }
                                    else
                                    {
                                        Console.WriteLine($"    {hl.title} -> podcastify failed");
                                    }
                                    break;
                                default:
                                    noteString += $"[{DateTime.Now.ToLongTimeString()}] - feed configured but action not recognized";
                                    break;
                            }
                            miscTasks.Add(ttrssClient.UpdateArticleNote(noteString, hl.id));
                        }
                    }
                }
            }


            Console.WriteLine($"awaiting remaining download tasks");
            Task.WaitAll(miscTasks.ToArray());
            await ttrssClient.Logout();
            Console.WriteLine($"done, moving files from temporary location");

            var resulted = Directory.GetFiles("tmp", "*.*", SearchOption.AllDirectories);
            if(resulted.Count() > 0)
            {
                foreach(var f in resulted)
                {
                    var moveTarget = Path.Combine(conf.OnDoneCopy, f.Substring("tmp/".Length));
                    if(!Path.Exists(Path.GetDirectoryName(moveTarget)))
                    {
                        Directory.CreateDirectory(Path.GetDirectoryName(moveTarget));
                    }
                    File.Move(f, moveTarget);
                }
            }
            Console.WriteLine($"done for real");
        }
        static Configuration Configure(string configurationPath = "appsettings.json")
        {
            if (!File.Exists(configurationPath))
            {
                Console.Error.WriteLine($"could not find configuration at {configurationPath}! copying sample to that spot.");
                File.Copy("sample-appsettings.json", configurationPath); //and you know what, if that explodes at the OS level, the OS should give you an error
                return null;
            }
            var fileContents = File.ReadAllText(configurationPath);
            if (string.IsNullOrWhiteSpace(fileContents))
            {
                Console.Error.WriteLine($"configuration file at {configurationPath} was empty! overwriting with sample settings.");
                File.Copy("sample-appsettings.json", configurationPath, true);
                return null;
            }

            var conf = JsonConvert.DeserializeObject<Configuration>(fileContents);

            if (conf == null)
            {
                Console.Error.WriteLine($"configuration file at {configurationPath} was empty! overwriting with sample settings.");
                File.Copy("sample-appsettings.json", configurationPath, true);
                return null;
            }

            return conf;
        }

        private static async Task<Tuple<bool, string>> standardDL(string articleLink)
        {
            Console.WriteLine($"   standard downloading {articleLink}");
            var ytdl = new YoutubeDLSharp.YoutubeDL();
            ytdl.YoutubeDLPath = "yt-dlp";
            ytdl.FFmpegPath = "ffmpeg";
            ytdl.OutputFolder = "./tmp/recent episodes";
            ytdl.OutputFileTemplate = "%(upload_date)s - %(title)s - [%(id)s].%(ext)s";
            var sw = new Stopwatch();
            sw.Start();
            var res = await ytdl.RunVideoDownload(articleLink);
            sw.Stop();
            var outputStr = $"{(res.Success ? "Success" : "fail")} in {sw.Elapsed}";
            if(res.ErrorOutput != null && res.ErrorOutput.Length > 0)
            {
                outputStr += "\n" + string.Join('\n', res.ErrorOutput);
            }
            Console.WriteLine($"    download {(res.Success ? "success" : "failed")}: {articleLink} -> {res.Data}");
            if(!res.Data.EndsWith(".mp4"))
            {
                Console.WriteLine("must convert video");
                sw.Reset();
                var outputFilename = res.Data.Substring(0, res.Data.LastIndexOf('.')) + ".mp4";
                sw.Start();
                var conversionProc =Process.Start("ffmpeg", $"-y -i \"{res.Data}\" \"{outputFilename}\"");
                conversionProc.WaitForExit();
                sw.Stop();
                Console.WriteLine($"    converted {res.Data} -> {outputFilename}");
                File.Delete(res.Data);
                outputStr += $"\nconverted in {sw.Elapsed}";
            }
            return new Tuple<bool, string>(res.Success, outputStr);
        }
        private static async Task<Tuple<bool, string>> podcastify(string articleLink, string podcastName)
        {
            var ytdl = new YoutubeDLSharp.YoutubeDL();
            ytdl.YoutubeDLPath = "yt-dlp";
            ytdl.FFmpegPath = "ffmpeg";
            ytdl.OutputFolder = $"./tmp/podcasts/{podcastName}";
            ytdl.OutputFileTemplate = "%(upload_date)s - %(title)s - [%(id)s].%(ext)s";
            var sw = new Stopwatch();
            sw.Start();
            var res = await ytdl.RunAudioDownload(articleLink);
            sw.Stop();
            var outputStr = $"{(res.Success ? "Success" : "fail")} in {sw.Elapsed}";
            if(res.ErrorOutput != null && res.ErrorOutput.Length > 0)
            {
                outputStr += "\n" + string.Join('\n', res.ErrorOutput);
            }
            if(!res.Data.EndsWith(".mp3"))
            {
                sw.Reset();
                var outputFilename = res.Data.Substring(0, res.Data.LastIndexOf('.')) + ".mp3";
                sw.Start();
                var conversionProc =Process.Start("ffmpeg", $"-y -i \"{res.Data}\" \"{outputFilename}\"");
                conversionProc.WaitForExit();
                sw.Stop();
                File.Delete(res.Data);
                outputStr += $"\nconverted in {sw.Elapsed}";
            }
            return new Tuple<bool, string>(res.Success, outputStr);
        }
    }
}