using SqlSugar;
using Microsoft.Extensions.Configuration;

namespace AssetManager.Data;

public static class SqlSugarConfig
{
    private static IConfiguration? _configuration;

    /// <summary>
    /// 初始化配置（在Program.cs中调用）
    /// </summary>
    public static void Initialize(IConfiguration configuration)
    {
        _configuration = configuration;
    }

    /// <summary>
    /// 获取 SqlSugarClient 实例（用于后台任务，每次创建新实例）
    /// </summary>
    public static ISqlSugarClient GetSqlSugarClient()
    {
        if (_configuration == null)
        {
            throw new InvalidOperationException("SqlSugarConfig has not been initialized. Call Initialize() first.");
        }

        var connectionString = GetConnectionString();

        // 使用 SqlSugarClient（非 Scope），每次创建独立实例
        // 适合后台任务、Task.Run 场景
        return new SqlSugarClient(new ConnectionConfig()
        {
            ConnectionString = connectionString,
            DbType = DbType.MySql,
            IsAutoCloseConnection = true,
            InitKeyType = InitKeyType.Attribute,
            ConfigureExternalServices = new ConfigureExternalServices
            {
                EntityService = (property, column) =>
                {
                    if (property.PropertyType == typeof(DateTime))
                    {
                        column.DataType = "datetime(3)";
                    }
                }
            }
        });
    }

    /// <summary>
    /// 获取 SqlSugarScope 实例（用于 DI 注入，Singleton/Scoped）
    /// </summary>
    public static ISqlSugarClient GetSqlSugarScope()
    {
        if (_configuration == null)
        {
            throw new InvalidOperationException("SqlSugarConfig has not been initialized. Call Initialize() first.");
        }

        var connectionString = GetConnectionString();

        return new SqlSugarScope(new ConnectionConfig()
        {
            ConnectionString = connectionString,
            DbType = DbType.MySql,
            IsAutoCloseConnection = true,
            InitKeyType = InitKeyType.Attribute,
            ConfigureExternalServices = new ConfigureExternalServices
            {
                EntityService = (property, column) =>
                {
                    if (property.PropertyType == typeof(DateTime))
                    {
                        column.DataType = "datetime(3)";
                    }
                }
            }
        });
    }

    private static string GetConnectionString()
    {
        var connectionString = Environment.GetEnvironmentVariable("ConnectionStrings__Default")
            ?? _configuration!.GetConnectionString("Default")
            ?? throw new InvalidOperationException("Connection string 'Default' not found in environment variables or configuration.");

        // MySQL 连接池优化配置
        if (!connectionString.Contains("Pooling=", StringComparison.OrdinalIgnoreCase))
        {
            connectionString += ";Pooling=true";
        }
        if (!connectionString.Contains("MaximumPoolSize=", StringComparison.OrdinalIgnoreCase))
        {
            connectionString += ";MaximumPoolSize=100";
        }
        if (!connectionString.Contains("MinimumPoolSize=", StringComparison.OrdinalIgnoreCase))
        {
            connectionString += ";MinimumPoolSize=5";
        }
        if (!connectionString.Contains("ConnectionTimeout=", StringComparison.OrdinalIgnoreCase))
        {
            connectionString += ";ConnectionTimeout=30";
        }
        if (!connectionString.Contains("ConnectionIdleTimeout=", StringComparison.OrdinalIgnoreCase))
        {
            connectionString += ";ConnectionIdleTimeout=180";
        }

        return connectionString;
    }
}