global using System;
global using System.Collections.Generic;
global using System.Text;
global using System.Text.Json;
global using System.Threading;
global using System.Threading.Tasks;
global using DTLib.Demystifier;
global using DTLib.Filesystem;
global using DTLib.Logging;
global using ParadoxSaveParser.Lib;
global using Directory = DTLib.Filesystem.Directory;
global using File = DTLib.Filesystem.File;
global using Path = DTLib.Filesystem.Path;
using System.Collections.Concurrent;
using System.IO;
using System.Text.Encodings.Web;
using DTLib.Dtsod;
using DTLib.Extensions;
using DTLib.Web;
using DTLib.Web.Routes;

namespace ParadoxSaveParser.WebAPI;

public partial class Program
{
    private static readonly IOPath _configPath = "./config.dtsod";
    private static Config _config = new();

    private static readonly ILogger _loggerRoot = new CompositeLogger(
        new ConsoleLogger(),
        new FileLogger("logs", "ParadoxSaveParser.WebAPI"));
    
    private static readonly CancellationTokenSource _mainCancel = new();
    private static ConcurrentDictionary<string, SaveFileMetadata> _saveMetadataStorage = new();
    
    private static JsonSerializerOptions _saveSerializerOptions = new()
    {
        WriteIndented = false,
        Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping,
        MaxDepth = 1024,
    };

    static void TestSearchExpression(Stream saveStream, TestCase tc)
    {
        saveStream.Seek(0, SeekOrigin.Begin);
        var se = SearchExpression.Parse(tc.q);
        var parser = new SaveParserEU4(saveStream, se);
        var rootNode = parser.Parse();
        string json = JsonSerializer.Serialize(rootNode, _saveSerializerOptions);
        string pdx = json.Substring(1, json.Length - 2)
            .Replace(",", " ").Replace("{", "{ ").Replace("}", " }")
            .Replace("\"", "").Replace("[", "").Replace("]", "").Replace(":", "=");
        if(pdx == tc.a)
        {
            Console.WriteLine($"[OK] q:'{tc.q}' a:'{tc.a}'");
        }
        else
        {
            Console.WriteLine($"[Error] q:'{tc.q}' a:'{tc.a}' r:'{pdx}'");
        }
    }

    record TestCase(string q, string a);
    
    public static void Main(string[] args)
    {
        
        using var saveStream = new MemoryStream(
            "EU4txt a={ b={ c=0 d=1 e=2 } f=3 }".ToBytes(), 
            false);

        TestCase[] testCases = [
            new("a", 
                "a={ b={ c=0 d=1 e=2 } f=3 }"),
            
            new("a.*", 
                "a={ b={ c=0 d=1 e=2 } f=3 }"),
            
            new("a.b", 
                "a={ b={ c=0 d=1 e=2 } }"),
            
            new("a.[0].c",
                "a={ b={ c=0 } }"),
            
            new("a.[1]",
                "a={ f=3 }"),
            
            new("a.b.(c|d)", 
                "a={ b={ c=0 d=1 } }"),
            
            new("a.(b.e|f)",
                "a={ b={ e=2 } f=3 }"),
        ];

        foreach (var test in testCases)
        {
            TestSearchExpression(saveStream, test);
        }

/*
        Console.InputEncoding = Encoding.UTF8;
        Console.OutputEncoding = Encoding.UTF8;
        Console.CursorVisible = false;
        ContextLogger logger = new ContextLogger(nameof(Main), _loggerRoot);
        Console.CancelKeyPress += (_, e) =>
        {
            e.Cancel = true;
            logger.LogInfo("Ctrl+C Pressed");
            _mainCancel.Cancel();
        };

        try
        {
            // config
            if (!File.Exists(_configPath))
            {
                logger.LogWarn("config file not found.");
                File.WriteAllText(_configPath, _config.ToString());
                logger.LogWarn($"created default at {_configPath}.");
            }
            else _config = Config.FromDtsod(new DtsodV23(File.ReadAllText(_configPath)));

            PrepareLocalFiles();

            // http server
            var router = new SimpleRouter(_loggerRoot);
            router.DefaultRoute = new ServeFilesRouteHandler("public");
            router.MapRoute("/getSaveStatus", HttpMethod.GET, GetSaveStatusHandler);
            router.MapRoute("/uploadSave/eu4", HttpMethod.POST, UploadSaveHandler);
            router.MapRoute("/parseSave/eu4", HttpMethod.POST, ParseSaveEU4Handler);

            var app = new WebApp(_config.BaseUrl, _loggerRoot, router, _mainCancel.Token);
            app.Run().GetAwaiter().GetResult();
        }
        catch (OperationCanceledException ex)
        {
            logger.LogWarn($"catched OperationCanceledException from {ex.Source}");
        }
        catch (Exception ex)
        {
            logger.LogError(ex.ToStringDemystified());
        }
*/
    }

    public static void PrepareLocalFiles()
    {
        Directory.Create(PathHelper.DATA_DIR);
        Directory.Create(PathHelper.SAVES_DIR);
        foreach (var metaFilePath in System.IO.Directory.GetFiles(
                     PathHelper.SAVES_DIR.Str, "*.meta.json",
                     SearchOption.TopDirectoryOnly))
        {
            using var metaFile = File.OpenRead(metaFilePath);
            var meta = JsonSerializer.Deserialize<SaveFileMetadata>(metaFile) ?? 
                       throw new NullReferenceException(metaFilePath);
            if (meta.status != SaveFileProcessingStatus.Done)
            {
                _loggerRoot.LogWarn(nameof(PrepareLocalFiles), $"metadata file '{metaFilePath}' status has invalid status {meta.status}");
            }

            if(!_saveMetadataStorage.TryAdd(meta.id, meta))
                throw new Exception("Guid collision!");
        }
    }
    
}