using System.Collections.Concurrent;
using System.Data;
using System.Diagnostics;
using System.Net;
using System.Reflection.Metadata.Ecma335;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices.Marshalling;
using System.Text;
using System.Text.RegularExpressions;
using System.Timers;
using System.Xml.Schema;
using Newtonsoft.Json;


namespace placeholdervo
{
    public partial class Program
    {

        [GeneratedRegex("^(\\[|#)")]
        private static partial Regex NonTextLine();
        public static Config conf;
        private static string workingDir = "./";
        private static HttpClient hc;
        
        private static ConcurrentQueue<string> titleCardLines = new ConcurrentQueue<string>();
        private static ConcurrentQueue<string> noteLines = new ConcurrentQueue<string>();
        private static ConcurrentDictionary<string, string> filePickups = new ConcurrentDictionary<string, string>();
        private static CancellationToken scriptFileCancellationToken;

        ///<summary>mostly just to give myself the reminder about paths</summary>
        ///<param name="src">the *complete path* of the awaited file. you might want conf.sync_dropoff</param>
        ///<param name="dest">the *complete path* to move the file to.</param>
        private static async void awaitFile(string src, string dest)
        {
            filePickups[src] = dest;
        }
        private static async void filePickup()
        {
            while(true)
            {
                foreach(var srcKey in filePickups.Keys)
                {
                    //Console.WriteLine($"hoping for {srcKey} (would move it to {filePickups[srcKey]})");
                    if(File.Exists(srcKey))
                    {
                        Console.WriteLine($"found {srcKey}");
                        string dest;
                        if (filePickups.TryRemove(srcKey, out dest))
                        {
                            File.Move(srcKey, dest, true);
                        }
                        else
                        {
                            Console.Error.WriteLine($"Failed to remove {srcKey} from filepickups. Unrecoverable, I think.");
                            Environment.Exit(-1);
                        }
                    }
                }
                if(scriptFileCancellationToken.IsCancellationRequested)
                {
                    //Console.WriteLine($"Cancellation requested. but I'm using it in more of a \"there won't be more work, but finish what you're doing\" kind of way.");
                    if(filePickups.IsEmpty)
                    {
                        Console.WriteLine("and we got nothing left, so we quit.");
                        return;
                    }
                }

                System.Threading.Thread.Sleep(TimeSpan.FromSeconds(5));
            }
        }

        private static async void FFStuff()
        {
            var cardCount = 0;
            var magnitude = 1;
            Console.WriteLine($"{titleCardLines.Count} title card lines");
            magnitude = (int)Math.Log10(titleCardLines.Count);
            Directory.CreateDirectory(conf.titlecards_dest);
            foreach(var tcL in titleCardLines)
            {
                Console.WriteLine("titlecard commanding");
                await Process.Start(conf.titlecard_command, tcL).WaitForExitAsync();
                cardCount++;
                File.Move("tc.png", Path.Combine(conf.titlecards_dest, $"tc{cardCount.ToString($"D{magnitude}")}.png"), true);
            }
            Console.WriteLine("titlecards done");

            if(noteLines != null)
            {
                cardCount = 0;
                Console.WriteLine($"{noteLines?.Count} note lines");
                magnitude = (int)Math.Log10(noteLines?.Count ?? 1);
                Directory.CreateDirectory(conf.notes_dest);
                foreach(var nL in noteLines)
                {
                    Console.WriteLine("note commanding");
                    await Process.Start(conf.note_command, nL).WaitForExitAsync();
                    cardCount++;
                    File.Move("note.png", Path.Combine(conf.notes_dest, $"note{cardCount.ToString($"D{magnitude}")}.png"), true);
                }
            }
        }
        public static async Task Main(string[] args)
        {
            conf = JsonConvert.DeserializeObject<Config>(
                File.ReadAllText(
                    AppDomain.CurrentDomain.BaseDirectory + "appsettings.json")) 
                ?? new Config();

            hc = new HttpClient(){ BaseAddress = new Uri(conf.speech_service)};
            var taskHeap = new List<Task>();

            var scriptPath = args?.FirstOrDefault();
            if(string.IsNullOrWhiteSpace(scriptPath))
            {
                scriptPath = "./script.md";
                if(!File.Exists(scriptPath))
                {
                    scriptPath = "./script.txt";
                    if(!File.Exists(scriptPath))
                    {
                        Console.Error.WriteLine("no script found.");
                        return;
                    }
                }
            }
            var scriptBasename = Path.GetFileNameWithoutExtension(scriptPath);
            workingDir = Path.GetDirectoryName(scriptPath);

            var cancelSource = new CancellationTokenSource();
            scriptFileCancellationToken = cancelSource.Token;

            var lines = File.ReadAllLines(scriptPath)
                .Append("\n").Append("\n");
            var primaryVOLines = new List<string>();
            var titlecardUnprocessed = new List<string>();
            
            var directiveLines = new List<string>();
            var altVOLines = new List<string>();
            
            foreach(var l in lines)
            {
                if(l.StartsWith('#'))
                {
                    titlecardUnprocessed.Add(l);
                }
                else if (l.StartsWith('['))
                {
                    directiveLines.Add(l);
                }
                else
                {
                    //as opposed to Environment.NewLine, which will be running on linux, and thus \n. ms speech api cooperates more with \r\n.
                    l.ReplaceLineEndings("\r\n");
                    primaryVOLines.Add(l);
                }
            }
            
            var scriptStripped = $"{scriptBasename}-primaryVO.txt";
            File.WriteAllLines(scriptStripped, primaryVOLines);
            taskHeap.Add(ttsVO(scriptStripped, Path.Combine(conf.VODropoff, $"primaryVO")));

            var titleLevels = new List<int>(){0};
            var titleIncrementDepth = 0;
            foreach(var l in titlecardUnprocessed)
            {
                titleIncrementDepth = 1;
                var thisString = l;
                while(thisString.StartsWith('#'))
                {
                    thisString = thisString.Substring(1);   
                    if(!thisString.StartsWith('#'))
                    {
                        if(titleLevels.Count < titleIncrementDepth)
                        {
                            titleLevels = [.. titleLevels, 0];
                        }
                        titleLevels[titleIncrementDepth-1]++;
                        if(titleLevels.Count > titleIncrementDepth)
                        {
                            titleLevels.RemoveRange(titleIncrementDepth, titleLevels.Count - titleIncrementDepth);
                        }
                        var TitleCardText = thisString.Trim();
                        if(titleLevels.Count > 1)
                        {
                            TitleCardText = string.Join('.', titleLevels[1..]) + ": " + TitleCardText;
                        }
                        Console.WriteLine($"title card: {TitleCardText}");
                        titleCardLines.Enqueue(TitleCardText);
                    }
                    else
                    {
                        titleIncrementDepth++;
                    }
                }
            }

            foreach(var l in directiveLines)
            {
                var thisLine = l.Trim();
                if(!thisLine.Contains(']'))
                {
                    Console.Error.WriteLine("malformed directive line: ");
                    Console.WriteLine(thisLine);
                    continue;
                }
                if (thisLine.EndsWith(']'))
                {
                    thisLine = thisLine.Trim('[', ']');

                    if (Uri.TryCreate(thisLine, UriKind.Absolute, out Uri asUri)
                        && (asUri.Scheme == Uri.UriSchemeHttp || asUri.Scheme == Uri.UriSchemeHttps))
                    {
                        Console.WriteLine($"uri: {asUri}. ship off to yt-dlp or project Ose?");
                    }
                    else
                    {
                        //just a directive, we can't do anything here
                        Console.WriteLine($"mere directive: {thisLine}");
                    }
                }
                else
                {
                    thisLine = thisLine.TrimStart('[');
                    var directiveName = thisLine[..thisLine.IndexOf(']')];
                    var parameterText = thisLine[(thisLine.IndexOf(']') + 1) ..].Trim();
                    if(directiveName == "note")
                    {
                        noteLines.Enqueue(parameterText);
                        Console.WriteLine($"on screen note: {parameterText}");                        
                    }
                    else
                    {
                        altVOLines.Add(parameterText);
                        Console.WriteLine($"alt VA: {parameterText}");
                    }
                }
            }
            if(altVOLines?.Count > 0)
            {
                var altVOscript = $"{scriptBasename}-altVO.txt";
                File.WriteAllLines(altVOscript, altVOLines);
                taskHeap.Add(ttsVO(altVOscript, Path.Combine(conf.VODropoff, $"altVO")));
            }
            
            // execute them all
            taskHeap.Add(Task.Run(FFStuff));
            taskHeap.Add(Task.Run(filePickup));
            Console.WriteLine("sleeping for 1 sec before requesting cancellation");
            System.Threading.Thread.Sleep(TimeSpan.FromSeconds(1));
            cancelSource.Cancel();
            Task.WaitAll([.. taskHeap]);
            Console.WriteLine("kbai");
        }

        private static async Task ttsVO(string scriptPath, string destPath)
        {
            HttpContent fileStreamContent = new StreamContent(File.OpenRead(scriptPath));
            using (var formData = new MultipartFormDataContent())
            {
                formData.Add(fileStreamContent, "file1", "file1");
    
                var response = await hc.PostAsync("/speak", formData);
                if (!response.IsSuccessStatusCode)
                {
                    Console.Error.WriteLine($"{response.StatusCode} - {response.ReasonPhrase} - {await response.Content.ReadAsStringAsync()}");
                }
                else
                {
                    var fname = (await response.Content.ReadAsStringAsync()).Trim('[').Trim(']').Trim('"');
                    Console.WriteLine($"success; {fname}."); //"success" might be a strong word; it's successfully submitted. Its decided what filename it will, eventually, give it.
                    var ext = Path.GetExtension(fname);
                    Directory.CreateDirectory(conf.VODropoff);
                    awaitFile(Path.Combine(conf.sync_dropoff, fname), destPath + $"{ext}");
                }
            }
        }
    }
}