using CVRManager.Models;

namespace CVRManager.Services;

public static class Paths
{
    public const int AppId = 661130;

    public static string ConfigDir => Environment.GetEnvironmentVariable("CVRMANAGER_CONFIG_DIR") is { Length: > 0 } custom
        ? custom
        : Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "CVRManager");
    public static string ConfigFile => Path.Combine(ConfigDir, "config.json");

    public static string Root { get; set; } = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "CVRManager");

    public static string SharedCache => Path.Combine(Root, "cache");
    public static string ModStore => Path.Combine(Root, "mods");
    public static string BranchCache => Path.Combine(Root, "sources", "branches.json");

    public static string InstallsRoot => Path.Combine(Root, "installs");
    public static string InstallDir(InstallInfo i) => Path.Combine(InstallsRoot, i.Folder);
    public static string GameDir(InstallInfo i) => InstallDir(i);

    public static string SafeFolderName(string name)
    {
        var bad = Path.GetInvalidFileNameChars();
        var cleaned = new string(name.Select(c => bad.Contains(c) ? ' ' : c).ToArray());
        while (cleaned.Contains("  ")) cleaned = cleaned.Replace("  ", " ");
        cleaned = cleaned.Trim().TrimEnd('.');
        if (cleaned.Length > 60) cleaned = cleaned[..60].TrimEnd();
        return cleaned.Length == 0 ? "Install" : cleaned;
    }
    public static string GameDataDir(string? gameDir = null)
    {
        string company = "ChilloutVR", product = "ChilloutVR";
        try
        {
            var info = gameDir == null ? null : Path.Combine(gameDir, "ChilloutVR_Data", "app.info");
            if (info != null && File.Exists(info) && File.ReadAllLines(info) is { Length: >= 2 } l && l[0].Trim().Length > 0 && l[1].Trim().Length > 0)
                (company, product) = (l[0].Trim(), l[1].Trim());
        }
        catch (Exception e) when (e is IOException or UnauthorizedAccessException) { }
        return Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile), "AppData", "LocalLow", company, product);
    }

    public static string CacheDir(InstallInfo i) => Path.Combine(GameDir(i), "ChilloutVR_Data", "Cache");
    public static string GameExe(InstallInfo i) => Path.Combine(GameDir(i), "ChilloutVR.exe");
    public static string Manifest(InstallInfo i) => Path.Combine(GameDir(i), "steamapps", $"appmanifest_{AppId}.acf");

    public static string ModVersionDir(ModDef m, string tag) => Path.Combine(ModStore, m.Id, Safe(tag));
    public static string ModFilesDir(ModDef m, string tag) => Path.Combine(ModVersionDir(m, tag), "files");

    public static string Safe(string s)
    {
        var bad = Path.GetInvalidFileNameChars();
        var r = new string(s.Select(c => bad.Contains(c) ? '_' : c).ToArray()).Trim().TrimEnd('.');
        return r.Length == 0 ? "_" : r;
    }
}