using OmniNX.DesktopInstaller.Models;

namespace OmniNX.DesktopInstaller.Services;

public sealed class VersionDetectService
{
    private const string ManifestRelative = @"config\omninx\manifest.ini";

    public OmniNxStatus DetectInstallation(string driveRoot)
    {
        var manifest = PathUtils.ToDrivePath(driveRoot, ManifestRelative);
        if (!File.Exists(manifest))
            return new OmniNxStatus { IsInstalled = false, Variant = OmniNxVariant.None };

        var variant = OmniNxVariant.None;
        var version = string.Empty;
        var inSection = false;

        foreach (var rawLine in File.ReadLines(manifest))
        {
            var line = rawLine.Trim();
            if (line.StartsWith('[') && line.EndsWith(']'))
            {
                inSection = line[1..^1].Equals("OmniNX", StringComparison.Ordinal);
                continue;
            }

            if (!inSection || !line.Contains('='))
                continue;

            var eq = line.IndexOf('=');
            var key = line[..eq].Trim();
            var val = line[(eq + 1)..].Trim();

            if (key.Equals("current_pack", StringComparison.Ordinal))
                variant = VariantHelper.ParsePackName(val);
            else if (key.Equals("version", StringComparison.Ordinal))
                version = val;
        }

        return new OmniNxStatus
        {
            IsInstalled = variant != OmniNxVariant.None,
            Variant = variant,
            Version = version,
        };
    }

    public InstallMode DetermineMode(OmniNxStatus status, bool forceClean)
    {
        if (forceClean)
            return InstallMode.Clean;
        return status.IsInstalled ? InstallMode.Update : InstallMode.Clean;
    }
}

public static class DriveService
{
    public sealed record DriveItem(DriveInfo Drive)
    {
        public override string ToString() => FormatDriveLabel(Drive);
    }

    public static IReadOnlyList<DriveItem> GetCandidateDrives()
    {
        return DriveInfo.GetDrives()
            .Where(d => d.IsReady && d.DriveType == DriveType.Removable)
            .OrderBy(d => d.Name)
            .Select(d => new DriveItem(d))
            .ToList();
    }

    public static string FormatDriveLabel(DriveInfo drive)
    {
        var label = string.IsNullOrWhiteSpace(drive.VolumeLabel) ? "No Label" : drive.VolumeLabel;
        var sizeGb = drive.TotalSize / (1024.0 * 1024 * 1024);
        return $"{drive.Name} [{label}] ({sizeGb:F1} GB, {drive.DriveFormat})";
    }
}