using Microsoft.Extensions.Configuration;
using QYZH.InteractiveMagazine.Models.Entity;
using SqlSugar;

namespace QYZH.InteractiveMagazine.Repository;

/// <summary>
/// SqlSugar 数据库上下文封装（静态类）
/// </summary>
public static class SqlSugarDbContext
{
    /// <summary>
    /// SqlSugarClient 实例
    /// </summary>
    private static SqlSugarClient? _db;

    /// <summary>
    /// 配置对象
    /// </summary>
    private static IConfiguration? _configuration;

    /// <summary>
    /// 初始化数据库上下文（在应用启动时调用一次）
    /// </summary>
    /// <param name="configuration">配置对象</param>
    public static void Init(IConfiguration configuration)
    {
        _configuration = configuration ?? throw new ArgumentNullException(nameof(configuration));
    }

    /// <summary>
    /// 获取 SqlSugarClient 实例
    /// </summary>
    /// <returns>SqlSugarClient 实例</returns>
    public static SqlSugarClient GetDb()
    {
        if (_configuration == null)
        {
            throw new InvalidOperationException("请先调用 SqlSugarDbContext.Init(configuration) 进行初始化");
        }

        if (_db == null)
        {
            lock (typeof(SqlSugarDbContext))
            {
                if (_db == null)
                {
                    var connectionString = _configuration.GetConnectionString("DefaultConnection");
                    if (string.IsNullOrWhiteSpace(connectionString))
                    {
                        throw new InvalidOperationException("未找到连接字符串 DefaultConnection");
                    }

                    _db = new SqlSugarClient(new ConnectionConfig
                    {
                        ConnectionString = connectionString,
                        DbType = DbType.MySql,
                        IsAutoCloseConnection = true,
                        InitKeyType = InitKeyType.Attribute
                    },
                    db =>
                    {
                        // 配置软删除全局过滤（继承 BaseEntity 的实体都有效）
                        db.QueryFilter.AddTableFilter<BaseEntity>(it => it.IsDeleted == false);

                        // 开启日志打印
                        db.Aop.OnLogExecuting = (sql, pars) =>
                        {
                            Console.WriteLine($"[SQL执行] {DateTime.Now:yyyy-MM-dd HH:mm:ss}");
                            Console.WriteLine($"[SQL语句] {sql}");
                            Console.WriteLine($"[SQL参数] {string.Join(", ", pars.Select(p => $"{p.ParameterName}={p.Value}"))}");
                            Console.WriteLine(new string('-', 50));
                        };
                    });
                }
            }
        }

        return _db;
    }

    /// <summary>
    /// 代码优先初始化（可选）
    /// </summary>
    /// <param name="entityTypes">实体类型数组</param>
    public static void InitializeCodeFirst(params Type[] entityTypes)
    {
        var db = GetDb();

        // 创建数据库（如果不存在）
        db.DbMaintenance.CreateDatabase();

        // 初始化表结构
        if (entityTypes != null && entityTypes.Length > 0)
        {
            db.CodeFirst.InitTables(entityTypes);
        }
    }
}