using Microsoft.Data.SqlClient;

namespace YY.Admin.Services.Service.EquipmentDb;

public interface IEquipmentDbConnectionFactory
{
    SqlConnection CreateConnection();
    Task<(bool Ok, string Message)> TestAsync(CancellationToken cancellationToken = default);
    EquipmentDbSettingsStore.EquipmentDbSettings CurrentSettings { get; }
    void Reload();
}

public sealed class EquipmentDbConnectionFactory : IEquipmentDbConnectionFactory
{
    private EquipmentDbSettingsStore.EquipmentDbSettings _settings = EquipmentDbSettingsStore.Load();

    public EquipmentDbSettingsStore.EquipmentDbSettings CurrentSettings => _settings;

    public void Reload()
    {
        _settings = EquipmentDbSettingsStore.Load();
    }

    public SqlConnection CreateConnection()
    {
        if (!_settings.Enabled)
        {
            throw new InvalidOperationException("设备库连接未启用");
        }
        return new SqlConnection(EquipmentDbSettingsStore.BuildConnectionString(_settings));
    }

    public async Task<(bool Ok, string Message)> TestAsync(CancellationToken cancellationToken = default)
    {
        try
        {
            Reload();
            await using var conn = CreateConnection();
            await conn.OpenAsync(cancellationToken).ConfigureAwait(false);
            await using var cmd = conn.CreateCommand();
            cmd.CommandText = "SELECT 1";
            cmd.CommandTimeout = Math.Max(5, _settings.ConnectTimeoutSeconds);
            var scalar = await cmd.ExecuteScalarAsync(cancellationToken).ConfigureAwait(false);
            return (true, "连接成功: " + scalar);
        }
        catch (Exception ex)
        {
            return (false, ex.Message);
        }
    }
}