using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Xml;
using System.Xml.Serialization;
using StoicGoose.Common.Utilities;

public sealed class DatabaseHandler
{
    readonly Dictionary<string, DatFile> datFiles = new();
    const string ResourceRoot = "StoicGooseUnity/emu/";

    public DatabaseHandler()
    {
        {
            string wsc = "Bandai - WonderSwan Color.dat";
            GetDatBytes(wsc, out byte[] loadedData);
            using (MemoryStream stream = new MemoryStream(loadedData))
            {
                var root = new XmlRootAttribute("datafile") { IsNullable = true };
                var serializer = new XmlSerializer(typeof(DatFile), root);
                var reader = XmlReader.Create(stream, new() { DtdProcessing = DtdProcessing.Ignore });
                datFiles.Add(Path.GetFileName(wsc), (DatFile)serializer.Deserialize(reader));
            }
        }

        {
            string ws = "Bandai - WonderSwan.dat";
            GetDatBytes(ws, out byte[] loadedData);
            using (MemoryStream stream = new MemoryStream(loadedData))
            {
                var root = new XmlRootAttribute("datafile") { IsNullable = true };
                var serializer = new XmlSerializer(typeof(DatFile), root);
                var reader = XmlReader.Create(stream, new() { DtdProcessing = DtdProcessing.Ignore });
                datFiles.Add(Path.GetFileName(ws), (DatFile)serializer.Deserialize(reader));
            }
        }

        Log.WriteEvent(LogSeverity.Information, this, $"Loaded {datFiles.Count} .dat file(s) with {datFiles.Sum(x => x.Value.Game.Length)} known game(s).");
        foreach (var datFile in datFiles.Select(x => x.Value))
            Log.WriteLine($" '{datFile.Header.Name} ({datFile.Header.Version})' from {datFile.Header.Homepage}");
    }

    bool GetDatBytes(string DatName, out byte[] loadedData)
    {
        try
        {
            loadedData = UnityEngine.Resources.Load<UnityEngine.TextAsset>(ResourceRoot + "Dat/" + DatName).bytes;
            return true;
        }
        catch
        {
            loadedData = null;
            return false;
        }
    }

    private DatGame GetGame(uint romCrc32, int romSize)
    {
        return datFiles.Select(x => x.Value.Game).Select(x => x.FirstOrDefault(x => x.Rom.Any(y => y.Crc.ToLowerInvariant() == $"{romCrc32:x8}" && y.Size.ToLowerInvariant() == $"{romSize:D}"))).FirstOrDefault(x => x != null);
    }

    public string GetGameTitle(uint romCrc32, int romSize)
    {
        return GetGame(romCrc32, romSize)?.Name.Replace("&", "&&") ?? "unrecognized game";
    }

    public class DatHeader
    {
        [XmlElement("name")]
        public string Name { get; set; }
        [XmlElement("description")]
        public string Description { get; set; }
        [XmlElement("category")]
        public string Category { get; set; }
        [XmlElement("version")]
        public string Version { get; set; }
        [XmlElement("date")]
        public string Date { get; set; }
        [XmlElement("author")]
        public string Author { get; set; }
        [XmlElement("email")]
        public string Email { get; set; }
        [XmlElement("homepage")]
        public string Homepage { get; set; }
        [XmlElement("url")]
        public string Url { get; set; }
        [XmlElement("comment")]
        public string Comment { get; set; }
    }

    public class DatRelease
    {
        [XmlAttribute("name")]
        public string Name { get; set; }
        [XmlAttribute("region")]
        public string Region { get; set; }
        [XmlAttribute("language")]
        public string Language { get; set; }
        [XmlAttribute("date")]
        public string Date { get; set; }
        [XmlAttribute("default")]
        public string Default { get; set; }
    }

    public class DatBiosSet
    {
        [XmlAttribute("name")]
        public string Name { get; set; }
        [XmlAttribute("description")]
        public string Description { get; set; }
        [XmlAttribute("default")]
        public string Default { get; set; }
    }

    public class DatRom
    {
        [XmlAttribute("name")]
        public string Name { get; set; }
        [XmlAttribute("size")]
        public string Size { get; set; }
        [XmlAttribute("crc")]
        public string Crc { get; set; }
        [XmlAttribute("sha1")]
        public string Sha1 { get; set; }
        [XmlAttribute("md5")]
        public string Md5 { get; set; }
        [XmlAttribute("merge")]
        public string Merge { get; set; }
        [XmlAttribute("status")]
        public string Status { get; set; }
        [XmlAttribute("date")]
        public string Date { get; set; }
    }

    public class DatDisk
    {
        [XmlAttribute("name")]
        public string Name { get; set; }
        [XmlAttribute("sha1")]
        public string Sha1 { get; set; }
        [XmlAttribute("md5")]
        public string Md5 { get; set; }
        [XmlAttribute("merge")]
        public string Merge { get; set; }
        [XmlAttribute("status")]
        public string Status { get; set; }
    }

    public class DatSample
    {
        [XmlAttribute("name")]
        public string Name { get; set; }
    }

    public class DatArchive
    {
        [XmlAttribute("name")]
        public string Name { get; set; }
    }

    public class DatGame
    {
        [XmlAttribute("name")]
        public string Name { get; set; }
        [XmlAttribute("sourcefile")]
        public string SourceFile { get; set; }
        [XmlAttribute("isbios")]
        public string IsBios { get; set; }
        [XmlAttribute("cloneof")]
        public string CloneOf { get; set; }
        [XmlAttribute("romof")]
        public string RomOf { get; set; }
        [XmlAttribute("sampleof")]
        public string SampleOf { get; set; }
        [XmlAttribute("board")]
        public string Board { get; set; }
        [XmlAttribute("rebuildto")]
        public string RebuildTo { get; set; }

        [XmlElement("year")]
        public string Year { get; set; }
        [XmlElement("manufacturer")]
        public string Manufacturer { get; set; }

        [XmlElement("release")]
        public DatRelease[] Release { get; set; }

        [XmlElement("biosset")]
        public DatBiosSet[] BiosSet { get; set; }

        [XmlElement("rom")]
        public DatRom[] Rom { get; set; }

        [XmlElement("disk")]
        public DatDisk[] Disk { get; set; }

        [XmlElement("sample")]
        public DatSample[] Sample { get; set; }

        [XmlElement("archive")]
        public DatArchive[] Archive { get; set; }
    }

    [Serializable()]
    public class DatFile
    {
        [XmlElement("header")]
        public DatHeader Header { get; set; }

        [XmlElement("game")]
        public DatGame[] Game { get; set; }
    }
}