using System.Security.Cryptography;
using Microsoft.Data.Sqlite;

namespace ytLive.Services;

public partial class LayoutStore : IDisposable
{
    public byte[]? GetAssetBytes(string assetId)
    {
        using var cmd = _connection.CreateCommand();
        cmd.CommandText = "SELECT Data FROM Asset WHERE Id = $id";
        cmd.Parameters.AddWithValue("$id", assetId);
        return cmd.ExecuteScalar() as byte[];
    }

    public string UpsertAsset(byte[] data, int pixelWidth, int pixelHeight)
    {
        var hash = Convert.ToHexString(SHA256.HashData(data));
        var id = Guid.NewGuid().ToString();

        using var cmd = _connection.CreateCommand();
        cmd.CommandText = """
            INSERT INTO Asset (Id, Hash, Data, PixelWidth, PixelHeight)
            VALUES ($id, $hash, $data, $w, $h)
            ON CONFLICT(Hash) DO NOTHING;
            """;
        cmd.Parameters.AddWithValue("$id", id);
        cmd.Parameters.AddWithValue("$hash", hash);
        cmd.Parameters.AddWithValue("$data", data);
        cmd.Parameters.AddWithValue("$w", pixelWidth);
        cmd.Parameters.AddWithValue("$h", pixelHeight);
        cmd.ExecuteNonQuery();

        cmd.CommandText = "SELECT Id FROM Asset WHERE Hash = $hash;";
        return (string)cmd.ExecuteScalar()!;
    }

    /// <summary>True when the asset already holds exactly these bytes. Used to decide whether a
    /// bundled image needs re-seeding: comparing bytes cannot go stale the way a version constant
    /// can (the constant and the embedded resource were built at different moments twice).</summary>
    public bool AssetMatches(string assetId, byte[] data)
    {
        if (string.IsNullOrWhiteSpace(assetId)) return false;
        var hash = Convert.ToHexString(SHA256.HashData(data));
        using var cmd = _connection.CreateCommand();
        cmd.CommandText = "SELECT 1 FROM Asset WHERE Id = $id AND Hash = $hash;";
        cmd.Parameters.AddWithValue("$id", assetId);
        cmd.Parameters.AddWithValue("$hash", hash);
        return cmd.ExecuteScalar() != null;
    }

    // ─── License (TASK 10 — Polar billing) ───

    /// <summary>The saved license key, or null if never entered.</summary>
}