using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using DHSoftware.Models;
using DHSoftware.Utils;
using SqlSugar;

namespace DHSoftware.Services
{

    public static class AuthService
    {
        public static User CurrentUser { get; private set; }

        public static bool Login(string username, string password)
        {
            using (var db = DatabaseUtil.GetDatabase())
            {
                var user = db.Queryable<User>()
                    .First(u => u.UserName == username);

                if (user != null && HashHelper.MD5Encrypt(password).Equals(user.Password))
                {
                    CurrentUser = user;
                    UpdateLastLoginTime(db, user.Id);
                    return true;
                }
                return false;
            }
        }

        public static bool HasPermission(string permissionCode)
        {
            if (CurrentUser == null) return false;

            using (var db = DatabaseUtil.GetDatabase())
            {
                    return db.Queryable<UserRole>()
             .InnerJoin<RolePermission>((ur, rp) => ur.RoleId == rp.RoleId)
             .Where((ur, rp) => ur.UserId == CurrentUser.Id)
             .Where((ur, rp) => rp.PermissionCode == permissionCode)
             .Any();
            }
        }

        public static List<string> GetUserPermissions()
        {
            if (CurrentUser == null) return new List<string>();

            using (var db = DatabaseUtil.GetDatabase())
            {
                return db.Queryable<UserRole>()
             .InnerJoin<RolePermission>((ur, rp) => ur.RoleId == rp.RoleId)
             .Where((ur, rp) => ur.UserId == CurrentUser.Id)
             .Select((ur, rp) => rp.PermissionCode)
             .ToList();
            }
        }

        private static void UpdateLastLoginTime(SqlSugarClient db, int userId)
        {
            db.Updateable<User>()
                .SetColumns(u => u.LastLoginTime == DateTime.Now)
                .Where(u => u.Id == userId)
                .ExecuteCommand();
        }
    }
}