using System.Collections.Immutable;
using System.Net;
using System.Text.Json;
using ICSharpCode.SharpZipLib.GZip;
using Swan.Mapping;
using TaikoWebUI.Shared.Models;

namespace TaikoWebUI.Services;

public class GameDataService : IGameDataService
{
    private readonly string[] bodyTitles = new string[Constants.COSTUME_BODY_MAX];
    private readonly HttpClient client;
    private readonly string[] faceTitles = new string[Constants.COSTUME_FACE_MAX];

    private readonly string[] headTitles = new string[Constants.COSTUME_HEAD_MAX];
    private readonly string[] kigurumiMTitles = new string[Constants.COSTUME_KIGURUMI_MAX];

    private readonly Dictionary<uint, MusicDetail> musicMap = new();
    private readonly string[] puchiTitles = new string[Constants.COSTUME_PUCHI_MAX];

    private ImmutableDictionary<uint, DanData> danMap = ImmutableDictionary<uint, DanData>.Empty;

    private ImmutableHashSet<Title> titles = ImmutableHashSet<Title>.Empty;

    public GameDataService(HttpClient client)
    {
        this.client = client;
    }

    public async Task InitializeAsync(string dataBaseUrl)
    {
        var musicInfo = await GetData<MusicInfo>(dataBaseUrl, Constants.MUSIC_INFO_BASE_NAME);
        var wordList = await GetData<WordList>(dataBaseUrl, Constants.WORD_LIST_BASE_NAME);
        var musicOrder = await GetData<MusicOrder>(dataBaseUrl, Constants.MUSIC_ORDER_BASE_NAME);
        var danData = await client.GetFromJsonAsync<List<DanData>>($"{dataBaseUrl}/data/dan_data.json");

        danData.ThrowIfNull();
        danMap = danData.ToImmutableDictionary(data => data.DanId);

        // To prevent duplicate entries in wordlist
        var dict = wordList.WordListEntries.GroupBy(entry => entry.Key)
            .ToImmutableDictionary(group => group.Key, group => group.First());
        await Task.Run(() => InitializeMusicMap(musicInfo, dict, musicOrder));

        await Task.Run(() => InitializeHeadTitles(dict));
        await Task.Run(() => InitializeFaceTitles(dict));
        await Task.Run(() => InitializeBodyTitles(dict));
        await Task.Run(() => InitializePuchiTitles(dict));
        await Task.Run(() => InitializeKigurumiTitles(dict));
        await Task.Run(() => InitializeTitles(dict));
    }

    private async Task<T> GetData<T>(string dataBaseUrl, string fileBaseName) where T : notnull
    {
        T? data;
        try
        {
            data = await client.GetFromJsonAsync<T>($"{dataBaseUrl}/data/{fileBaseName}.json");
            data.ThrowIfNull();
            return data;
        }
        catch (HttpRequestException e)
        {
            if (e.StatusCode != HttpStatusCode.NotFound)
            {
                throw;
            }
            await using var compressed = await client.GetStreamAsync($"{dataBaseUrl}/data/{fileBaseName}.bin");
            await using var gZipInputStream = new GZipInputStream(compressed);
            using var decompressed = new MemoryStream();
            
            // Decompress
            await gZipInputStream.CopyToAsync(decompressed);

            // Reset stream for reading
            decompressed.Position = 0;
            data = await JsonSerializer.DeserializeAsync<T>(decompressed);
            data.ThrowIfNull();
            return data;
        }
    }
    
    public string GetMusicNameBySongId(uint songId)
    {
        return musicMap.TryGetValue(songId, out var musicDetail) ? musicDetail.SongName : string.Empty;
    }

    public string GetMusicArtistBySongId(uint songId)
    {
        return musicMap.TryGetValue(songId, out var musicDetail) ? musicDetail.ArtistName : string.Empty;
    }

    public SongGenre GetMusicGenreBySongId(uint songId)
    {
        return musicMap.TryGetValue(songId, out var musicDetail) ? musicDetail.Genre : SongGenre.Variety;
    }

    public int GetMusicIndexBySongId(uint songId)
    {
        return musicMap.TryGetValue(songId, out var musicDetail) ? musicDetail.Index : int.MaxValue;
    }

    public DanData GetDanDataById(uint danId)
    {
        return danMap.GetValueOrDefault(danId, new DanData());
    }

    public int GetMusicStarLevel(uint songId, Difficulty difficulty)
    {
        var success = musicMap.TryGetValue(songId, out var musicDetail);
        return difficulty switch
        {
            Difficulty.None => throw new ArgumentException("Difficulty cannot be none"),
            Difficulty.Easy => success ? musicDetail!.StarEasy : 0,
            Difficulty.Normal => success ? musicDetail!.StarNormal : 0,
            Difficulty.Hard => success ? musicDetail!.StarHard : 0,
            Difficulty.Oni => success ? musicDetail!.StarOni : 0,
            Difficulty.UraOni => success ? musicDetail!.StarUra : 0,
            _ => throw new ArgumentOutOfRangeException(nameof(difficulty), difficulty, null)
        };
    }

    public string GetHeadTitle(uint index)
    {
        return index < headTitles.Length ? headTitles[index] : string.Empty;
    }

    public string GetKigurumiTitle(uint index)
    {
        return index < kigurumiMTitles.Length ? kigurumiMTitles[index] : string.Empty;
    }

    public string GetBodyTitle(uint index)
    {
        return index < bodyTitles.Length ? bodyTitles[index] : string.Empty;
    }

    public string GetFaceTitle(uint index)
    {
        return index < faceTitles.Length ? faceTitles[index] : string.Empty;
    }

    public string GetPuchiTitle(uint index)
    {
        return index < puchiTitles.Length ? puchiTitles[index] : string.Empty;
    }

    public ImmutableHashSet<Title> GetTitles()
    {
        return titles;
    }

    private void InitializeTitles(ImmutableDictionary<string, WordListEntry> dict)
    {
        var set = ImmutableHashSet.CreateBuilder<Title>();
        for (var i = 1; i < Constants.PLAYER_TITLE_MAX; i++)
        {
            var key = $"syougou_{i}";

            var titleWordlistItem = dict.GetValueOrDefault(key, new WordListEntry());

            set.Add(new Title{
                TitleName = titleWordlistItem.JapaneseText,
                TitleId = i
            });
        }

        titles = set.ToImmutable();
    }

    private void InitializePuchiTitles(ImmutableDictionary<string, WordListEntry> dict)
    {
        for (var i = 0; i < Constants.COSTUME_PUCHI_MAX; i++)
        {
            var key = $"costume_puchi_{i}";

            var costumeWordlistItem = dict.GetValueOrDefault(key, new WordListEntry());
            puchiTitles[i] = costumeWordlistItem.JapaneseText;
        }
    }

    private void InitializeKigurumiTitles(ImmutableDictionary<string, WordListEntry> dict)
    {
        for (var i = 0; i < Constants.COSTUME_KIGURUMI_MAX; i++)
        {
            var key = $"costume_kigurumi_{i}";

            var costumeWordlistItem = dict.GetValueOrDefault(key, new WordListEntry());
            kigurumiMTitles[i] = costumeWordlistItem.JapaneseText;
        }
    }

    private void InitializeBodyTitles(ImmutableDictionary<string, WordListEntry> dict)
    {
        for (var i = 0; i < Constants.COSTUME_BODY_MAX; i++)
        {
            var key = $"costume_body_{i}";

            var costumeWordlistItem = dict.GetValueOrDefault(key, new WordListEntry());
            bodyTitles[i] = costumeWordlistItem.JapaneseText;
        }
    }

    private void InitializeFaceTitles(ImmutableDictionary<string, WordListEntry> dict)
    {
        for (var i = 0; i < Constants.COSTUME_FACE_MAX; i++)
        {
            var key = $"costume_face_{i}";

            var costumeWordlistItem = dict.GetValueOrDefault(key, new WordListEntry());
            faceTitles[i] = costumeWordlistItem.JapaneseText;
        }
    }

    private void InitializeHeadTitles(ImmutableDictionary<string, WordListEntry> dict)
    {
        for (var i = 0; i < Constants.COSTUME_HEAD_MAX; i++)
        {
            var key = $"costume_head_{i}";

            var costumeWordlistItem = dict.GetValueOrDefault(key, new WordListEntry());
            headTitles[i] = costumeWordlistItem.JapaneseText;
        }
    }

    private void InitializeMusicMap(MusicInfo musicInfo, ImmutableDictionary<string, WordListEntry> dict,
        MusicOrder musicOrder)
    {
        foreach (var music in musicInfo.Items)
        {
            var songNameKey = $"song_{music.Id}";
            var songArtistKey = $"song_sub_{music.Id}";

            var musicName = dict.GetValueOrDefault(songNameKey, new WordListEntry());
            var musicArtist = dict.GetValueOrDefault(songArtistKey, new WordListEntry());

            var musicSongId = music.SongId;
            var musicDetail = music.CopyPropertiesToNew<MusicDetail>();
            musicDetail.SongName = musicName.JapaneseText;
            musicDetail.ArtistName = musicArtist.JapaneseText;

            musicMap.TryAdd(musicSongId, musicDetail);
        }

        for (var index = 0; index < musicOrder.Order.Count; index++)
        {
            var musicOrderEntry = musicOrder.Order[index];
            var songId = musicOrderEntry.SongId;
            if (musicMap.ContainsKey(songId))
            {
                musicMap[songId].Index = index;
            }
        }
    }
}