using APT.BaseData.Domain.ApiModel;
using APT.BaseData.Domain.ApiModel.PF;
using APT.BaseData.Domain.Entities.FM;
using APT.BaseData.Domain.IServices.OP;
using APT.MS.Domain.Entities.SK;
using Microsoft.EntityFrameworkCore;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace APT.SK.WebApi.Controllers.Api
{
    public class CrossDbContext : DbContext
    {
        public DbSet<T_SK_BASIC_LIBRARY> T_SK_BASIC_LIBRARY { get; set; }
        // 动态连接字符串（外部传入）
        private readonly string _connString;

        // 构造函数：动态接收连接字符串
        public CrossDbContext(string connString)
        {
            _connString = connString;
        }
        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            // 使用动态的连接字符串
            optionsBuilder.UseSqlServer(_connString);
        }
        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            // 必须把你的实体配置进去，EF才认识它
            modelBuilder.Entity<T_SK_BASIC_LIBRARY>()
                   .Ignore(x => x.Nav_Org)
                   .Ignore(x => x.DbConn)
                   .Ignore(x => x.TaskID);
            //modelBuilder.Entity<OrgRuleDeptCheck>()
            //        .Ignore(x => x.departmentCheckedKeys);
        }
        /// <summary>
        /// 跨库查询：同服务器，多个库
        /// </summary>
        /// <param name="databaseNames">库名列表</param>
        /// <returns>跨库合并结果</returns>
        public IQueryable<T_SK_BASIC_LIBRARY> QueryCrossDatabases(List<string> databaseNames)
        {
            IQueryable<T_SK_BASIC_LIBRARY>? query = null;

            foreach (var dbName in databaseNames)
            {
                // 核心：动态拼接 库名.dbo.表名
                string sql = $"SELECT * FROM {dbName}.dbo.T_SK_BASIC_LIBRARY";
                var dbSet = this.Set<T_SK_BASIC_LIBRARY>().FromSqlRaw(sql);
                query = dbSet;
                //query = query == null ? dbSet : query.UnionAll(dbSet);
            }

            return query ?? Enumerable.Empty<T_SK_BASIC_LIBRARY>().AsQueryable();
        }
        /// <summary>
        /// 跨库查询：同服务器，多个库,静态数据库连接时直接给库名称
        /// </summary>
        /// <returns>跨库合并结果</returns>
        // ========== 查询方法：直接跨库合并 ==========
        public IQueryable<T_SK_BASIC_LIBRARY> GetAllUserInfos()
        {
            // 查询库B（关键：直接修改表名，同服务器跨库）
            var dbBUsers = this.Set<T_SK_BASIC_LIBRARY>()
                               .FromSqlRaw("SELECT * FROM mh_jy_head.dbo.T_SK_BASIC_LIBRARY");

            return dbBUsers;
        }
    }
}