using System;
using System.Collections.Generic;
using System.IO;

namespace NHSE.Core;

/// <summary>
/// Logic for dumping decrypted game files.
/// </summary>
/// <seealso cref="GameFileLoader"/>
public static class GameFileDumper
{
    /// <summary>
    /// Dumps a copy of the <see cref="sav"/>'s files in their decrypted state to the requested <see cref="path"/>.
    /// </summary>
    /// <param name="sav">Save Data to dump</param>
    /// <param name="path">Path to dump to</param>
    public static void Dump(this HorizonSave sav, string path)
    {
        sav.Main.Dump(path);
        foreach (var p in sav.Players)
        {
            var dir = Path.Combine(path, p.DirectoryName);
            p.Dump(dir);
        }
    }

    /// <summary>
    /// Dumps a copy of the <see cref="player"/>'s files in their decrypted state to the requested <see cref="path"/>.
    /// </summary>
    /// <param name="player">Save Data to dump</param>
    /// <param name="path">Path to dump to</param>
    public static void Dump(this Player player, string path)
    {
        foreach (var pair in player)
            pair.Dump(path);
    }

    /// <summary>
    /// Dumps a copy of the <see cref="pair"/>'s files in their decrypted state to the requested <see cref="path"/>.
    /// </summary>
    /// <param name="pair">Save Data to dump</param>
    /// <param name="path">Path to dump to</param>
    public static void Dump(this EncryptedFilePair pair, string path)
    {
        Dump(path, pair.Data, pair.NameData);
    }

    private static void Dump(string path, ReadOnlySpan<byte> data, string name)
    {
        Directory.CreateDirectory(path);
        var file = Path.Combine(path, name);
        File.WriteAllBytes(file, data);
    }

    /// <summary>
    /// Dumps all villager houses to the requested <see cref="path"/>.
    /// </summary>
    /// <param name="houses"></param>
    /// <param name="players"></param>
    /// <param name="path">Path to dump to</param>
    public static void DumpPlayerHouses(this IReadOnlyList<IPlayerHouse> houses, IReadOnlyList<Player> players, string path)
    {
        for (int i = 0; i < houses.Count; i++)
        {
            var filename = i < players.Count ? players[i].Personal.PlayerName : $"House {i}";
            houses[i].Dump(filename, path);
        }
    }

    /// <summary>
    /// Dumps all villager houses to the requested <see cref="path"/>.
    /// </summary>
    /// <param name="sav">Save Data to dump from</param>
    /// <param name="path">Path to dump to</param>
    public static void DumpPlayerHouses(this HorizonSave sav, string path)
    {
        var count = Math.Min(sav.Players.Count, MainSaveOffsets.PlayerCount);
        for (int i = 0; i < count; i++)
        {
            var p = sav.Players[i];
            var h = sav.Main.GetPlayerHouse(i);
            h.Dump(path, p.Personal);
        }
    }

    private static void Dump(this IPlayerHouse h, string path, Personal p) => h.Dump(p.PlayerName, path);

    private static void Dump(this IPlayerHouse h, string player, string path)
    {
        var dest = Path.Combine(path, $"{player}.{h.Extension}");
        var data = h.Write();
        File.WriteAllBytes(dest, data);
    }

    /// <summary>
    /// Dumps all villager houses to the requested <see cref="path"/>.
    /// </summary>
    /// <param name="sav">Save Data to dump from</param>
    /// <param name="path">Path to dump to</param>
    public static void DumpVillagerHouses(this MainSave sav, string path)
    {
        for (int i = 0; i < MainSaveOffsets.VillagerCount; i++)
        {
            var v = sav.GetVillager(i);
            var h = sav.GetVillagerHouse(i);
            h.Dump(path, v);
        }
    }

    private static void Dump(this IVillagerHouse h, string path, IVillager v)
    {
        var name = GameInfo.Strings.GetVillager(v.InternalName);
        var dest = Path.Combine(path, $"{name}.{h.Extension}");
        var data = h.Write();
        File.WriteAllBytes(dest, data);
    }

    /// <summary>
    /// Dumps all villagers to the requested <see cref="path"/>.
    /// </summary>
    /// <param name="villagers">Data to dump from</param>
    /// <param name="path">Path to dump to</param>
    public static void Dump(this IEnumerable<IVillager> villagers, string path)
    {
        foreach (var v in villagers)
            v.Dump(path);
    }

    private static void Dump(this IVillager v, string path)
    {
        var name = GameInfo.Strings.GetVillager(v.InternalName);
        var dest = Path.Combine(path, $"{name}.{v.Extension}");
        File.WriteAllBytes(dest, v.Write());
    }

    /// <summary>
    /// Dumps all designs to the requested <see cref="path"/>.
    /// </summary>
    /// <param name="sav">Save Data to dump from</param>
    /// <param name="path">Path to dump to</param>
    /// <param name="indexed">Export file names prepended with design index</param>
    public static void DumpDesigns(this MainSave sav, string path, bool indexed)
    {
        for (int i = 0; i < sav.Offsets.PatternCount; i++)
        {
            var dp = sav.GetDesign(i);
            dp.Dump(path, i, indexed);
        }
    }

    /// <summary>
    /// Dumps all designs to the requested <see cref="path"/>.
    /// </summary>
    /// <param name="patterns">Patterns to dump</param>
    /// <param name="path">Path to dump to</param>
    /// <param name="indexed">Export file names prepended with design index</param>
    public static void Dump(this IReadOnlyList<DesignPattern> patterns, string path, bool indexed)
    {
        for (var index = 0; index < patterns.Count; index++)
        {
            var dp = patterns[index];
            dp.Dump(path, index, indexed);
        }
    }

    private static void Dump(this DesignPattern dp, string path, int index, bool indexed)
    {
        var name = dp.DesignName;
        string fn = indexed
            ? $"{index:00} - {name}.nhd"
            : $"{name}.nhd";
        fn = StringUtil.CleanFileName(fn);
        var dest = Path.Combine(path, fn);
        File.WriteAllBytes(dest, dp.Data);
    }

    /// <summary>
    /// Loads all designs from the requested <see cref="path"/>.
    /// </summary>
    /// <param name="patterns">Patterns to load</param>
    /// <param name="path">Path to load from</param>
    /// <param name="changeOrigins">Change origins of Patterns</param>
    public static void Load(this DesignPattern[] patterns, string path, Personal player, bool changeOrigins)
    {
        if (patterns.Length == 0)
            return;

        var files = Directory.GetFiles(path, "*.nhd", SearchOption.TopDirectoryOnly);
        int ctr = 0;
        foreach (var f in files)
        {
            var fi = new FileInfo(f);
            if (fi.Length != DesignPattern.SIZE)
                continue;

            var data = File.ReadAllBytes(f);
            var p = new DesignPattern(data);
            if (changeOrigins)
                p.ChangeOrigins(player, data);
            patterns[ctr] = p;
            if (++ctr >= patterns.Length)
                break;
        }
    }

    /// <summary>
    /// Dumps all designs to the requested <see cref="path"/>.
    /// </summary>
    /// <param name="sav">Save Data to dump from</param>
    /// <param name="path">Path to dump to</param>
    /// <param name="indexed">Export file names prepended with design index</param>
    public static void DumpDesignsPRO(this MainSave sav, string path, bool indexed)
    {
        for (int i = 0; i < sav.Offsets.PatternCount; i++)
        {
            var dp = sav.GetDesignPRO(i);
            dp.Dump(path, i, indexed);
        }
    }

    /// <summary>
    /// Dumps all designs to the requested <see cref="path"/>.
    /// </summary>
    /// <param name="patterns">Patterns to dump</param>
    /// <param name="path">Path to dump to</param>
    /// <param name="indexed">Export file names prepended with design index</param>
    public static void Dump(this IReadOnlyList<DesignPatternPRO> patterns, string path, bool indexed)
    {
        for (var index = 0; index < patterns.Count; index++)
        {
            var dp = patterns[index];
            dp.Dump(path, index, indexed);
        }
    }

    /// <summary>
    /// Loads all designs from the requested <see cref="path"/>.
    /// </summary>
    /// <param name="patterns">Patterns to load</param>
    /// <param name="path">Path to load from</param>
    /// <param name="changeOrigins">Change origins of Patterns</param>
    /// <param name="sortAlpha">Sort the files by file name instead of depending on the Operating System's return order</param>
    public static void Load(this DesignPatternPRO[] patterns, string path, Personal player, bool changeOrigins, bool sortAlpha = true)
    {
        if (patterns.Length == 0)
            return;

        var files = Directory.GetFiles(path, "*.nhpd", SearchOption.TopDirectoryOnly);
        if (sortAlpha)
            Array.Sort(files);
        int ctr = 0;
        foreach (var f in files)
        {
            var fi = new FileInfo(f);
            if (fi.Length != DesignPatternPRO.SIZE)
                continue;

            var data = File.ReadAllBytes(f);
            var p = new DesignPatternPRO(data);
            if (changeOrigins)
                p.ChangeOrigins(player, data);
            patterns[ctr] = p;
            if (++ctr >= patterns.Length)
                break;
        }
    }

    private static void Dump(this DesignPatternPRO dp, string path, int index, bool indexed)
    {
        var name = dp.DesignName;
        string fn = indexed
            ? $"{index:00} - {name}.nhpd"
            : $"{name}.nhpd";
        fn = StringUtil.CleanFileName(fn);
        var dest = Path.Combine(path, fn);
        File.WriteAllBytes(dest, dp.Data);
    }
}