using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
using SlamCross.Models;

namespace SlamCross.Services;

public static class CfgService
{
    public static void WriteCfgFiles(SourceGame game, string steamAppsPath, AppSettings settings)
    {
        var sep = RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? '\\' : '/';
        var gameDir = Path.Combine(steamAppsPath, game.Directory.Replace('\\', sep));
        var cfgFolder = Path.Combine(gameDir, game.ToCfg.Replace('\\', sep));

        if (!Directory.Exists(cfgFolder))
            throw new Exception($"CS2 cfg folder not found: {cfgFolder}\nCheck your Steam/CS2 installation path.");

        var lines = new List<string>();
        lines.Add("alias slam_play \"slam_updatecfg;slam_play_on;\"");
        if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
        {
            lines.Add("alias slam_play_on \"alias slam_play slam_play_off; slam_nonce; slam_updatecfg; voice_loopback 1; +voicerecord\"");
            lines.Add("alias slam_play_off \"alias slam_play slam_play_on; -voicerecord; voice_loopback 0;\"");
        }
        else
        {
            var virtualMicOut = string.IsNullOrEmpty(settings.VirtualMicOutDeviceName) ? "CABLE Output (VB-Audio Virtual Cable)" : settings.VirtualMicOutDeviceName.Trim();
            var regularMic = string.IsNullOrEmpty(settings.RegularMicDeviceName) ? "Microphone" : settings.RegularMicDeviceName.Trim();
            lines.Add($"alias slam_play_on \"alias slam_play slam_play_off; slam_nonce; slam_updatecfg; voice_loopback 1; voice_device_override {virtualMicOut}; +voicerecord\"");
            lines.Add($"alias slam_play_off \"alias slam_play slam_play_on; -voicerecord; voice_loopback 0; voice_device_override {regularMic};\"");
        }
        lines.Add("alias slam_updatecfg \"host_writeconfig\"");

        // the relay bind flips between _a/_b on each play press, so the app can tell a real
        // press apart from CS2 rewriting the vcfg on its own (round start, buy menu)
        lines.Add("alias slam_nonce slam_nonce_a");
        lines.Add("alias slam_nonce_a \"alias slam_nonce slam_nonce_b; slam_bind_a\"");
        lines.Add("alias slam_nonce_b \"alias slam_nonce slam_nonce_a; slam_bind_b\"");
        lines.Add("alias slam_bind_a \"\"");
        lines.Add("alias slam_bind_b \"\"");
        lines.Add("alias slam_none \"\"");
        lines.Add($"bind {settings.RelayKey} slam_none");

        if (settings.HoldToPlay)
        {
            lines.Add("alias +slam_hold_play slam_play_on");
            lines.Add("alias -slam_hold_play slam_play_off");
            lines.Add($"bind {settings.PlayKey} +slam_hold_play");
        }
        else
        {
            lines.Add($"bind {settings.PlayKey} slam_play");
        }

        lines.Add("alias slam_listtracks \"exec slam_tracklist.cfg\"");
        lines.Add("alias slam_curtrack \"exec slam_curtrack.cfg\"");
        lines.Add("alias slam_saycurtrack \"exec slam_saycurtrack.cfg\"");
        lines.Add("alias slam_sayteamcurtrack \"exec slam_sayteamcurtrack.cfg\"");

        for (int i = 0; i < game.Tracks.Count; i++)
        {
            var n = i + 1;
            var track = game.Tracks[i];
            lines.Add($"alias slam_bindcmd_{n}_a \"bind {settings.RelayKey} slam_r_{n}_a\"");
            lines.Add($"alias slam_bindcmd_{n}_b \"bind {settings.RelayKey} slam_r_{n}_b\"");
            lines.Add($"alias slam_r_{n}_a \"\"");
            lines.Add($"alias slam_r_{n}_b \"\"");
            var select = $"alias slam_bind_a slam_bindcmd_{n}_a; alias slam_bind_b slam_bindcmd_{n}_b";
            lines.Add($"alias {n} \"{select}\"");
            if (settings.WriteTags)
                foreach (var tag in track.Tags)
                    lines.Add($"alias {tag} \"{select}\"");
            if (!string.IsNullOrEmpty(track.Hotkey))
                lines.Add($"bind {track.Hotkey} \"{select}; slam_play_on;\"");
        }

        var footer = "voice_modenable 1; con_enable 1";
        if (game.VoiceFadeOut) footer += "; voice_fadeouttime 0.0";
        footer += "; host_writeconfig";
        lines.Add(footer);

        // CS2 limits exec files to 200 lines; chain into slam2, slam3, etc. if needed.
        const int chunkSize = 199;
        int fileIdx = 1;
        for (int written = 0; written < lines.Count; written += chunkSize)
        {
            var fileName = fileIdx == 1 ? "slam.cfg" : $"slam{fileIdx}.cfg";
            var chunk = lines.GetRange(written, Math.Min(chunkSize, lines.Count - written));
            if (written + chunkSize < lines.Count)
                chunk.Add($"exec slam{fileIdx + 1}");
            File.WriteAllLines(Path.Combine(cfgFolder, fileName), chunk);
            fileIdx++;
        }

        using var trackList = new StreamWriter(Path.Combine(cfgFolder, "slam_tracklist.cfg"));
        trackList.WriteLine("echo \"You can select tracks by tag or number.\"");
        trackList.WriteLine("echo \"--------------------Tracks--------------------\"");
        for (int i = 0; i < game.Tracks.Count; i++)
        {
            var t = game.Tracks[i];
            var tagStr = settings.WriteTags && t.Tags.Count > 0
                ? $" ['{string.Join("', '", t.Tags)}']" : "";
            trackList.WriteLine($"echo \"{i + 1}. {t.Name}{tagStr}\"");
        }
        trackList.WriteLine("echo \"----------------------------------------------\"");
    }

    public static void DeleteCfgFiles(SourceGame game, string steamAppsPath)
    {
        var sep = RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? '\\' : '/';
        var cfgFolder = Path.Combine(steamAppsPath, game.Directory.Replace('\\', sep), game.ToCfg.Replace('\\', sep));
        string[] files = ["slam.cfg", "slam_tracklist.cfg", "slam_relay.cfg",
                          "slam_curtrack.cfg", "slam_saycurtrack.cfg", "slam_sayteamcurtrack.cfg"];
        foreach (var f in files)
        {
            var path = Path.Combine(cfgFolder, f);
            if (File.Exists(path)) try { File.Delete(path); } catch { }
        }
    }

    public static void WriteTrackCfgs(SourceGame game, string steamAppsPath, Track track)
    {
        var sep = RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? '\\' : '/';
        var cfgFolder = Path.Combine(steamAppsPath, game.Directory.Replace('\\', sep), game.ToCfg.Replace('\\', sep));
        File.WriteAllText(Path.Combine(cfgFolder, "slam_curtrack.cfg"), $"echo \"[SLAM] Track name: {track.Name}\"\n");
        File.WriteAllText(Path.Combine(cfgFolder, "slam_saycurtrack.cfg"), $"say \"[SLAM] Track name: {track.Name}\"\n");
        File.WriteAllText(Path.Combine(cfgFolder, "slam_sayteamcurtrack.cfg"), $"say_team \"[SLAM] Track name: {track.Name}\"\n");
    }
}