using Furion.DatabaseAccessor;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;

namespace ApiTools.Core
{
    public static class CollectionUtils
    {
        /// <summary>
        /// 去重添加
        /// </summary>
        /// <typeparam name="T">泛型对象</typeparam>
        /// <param name="list">集合</param>
        /// <param name="item">需添加的项</param>
        /// <param name="comparer">比较</param>
        /// <returns>集合</returns>
        public static List<T> DistinctAdd<T>(this List<T> list, T item, IEqualityComparer<T> comparer = null)
        {
            if (list == null) return new List<T> { item };
            if (!list.Contains(item, comparer)) list.Add(item);
            return list;
        }

        public static List<TResult> DistinctSelect<TSource, TResult>(this IEnumerable<TSource> list, Func<TSource, TResult> selector)
        {
            return list.Select(selector).Distinct().ToList();
        }

        public static List<TResult> DistinctSelect<TSource, TResult>(this IEnumerable<TSource> list, Func<TSource, bool> predicate, Func<TSource, TResult> selector)
        {
            return list.Where(predicate).Select(selector).Distinct().ToList();
        }

        public static string SplitJoin(this IEnumerable<string> list, string split)
        {
            list = list.DistinctSelect(it => it.IsNotNull(), it => it);
            return string.Join(split, list);
        }

        public static string SplitJoin<T>(this IEnumerable<T> list, Func<T, string> selector, string split)
        {
            return list.Select(selector).SplitJoin(split);
        }

        public static string SplitJoin<T>(this IEnumerable<T> list, Func<T, bool> predicate, Func<T, string> selector, string split)
        {
            return list.Where(predicate).Select(selector).SplitJoin(split);
        }

        public static bool IsNull<T>(this T[] list)
        {
            return list == null || list.Length == 0;
        }

        public static bool IsNotNull<T>(this T[] list)
        {
            return !list.IsNull();
        }

        public static bool IsNull<T>(this List<T> list)
        {
            return list == null || list.Count == 0;
        }

        public static bool IsNotNull<T>(this List<T> list)
        {
            return !list.IsNull();
        }

        public static IQueryable<TEntity> GetQueryable<TEntity, TDbContextLocator>(this IRepository<TEntity, TDbContextLocator> rep, bool noTracking = true)
            where TEntity : class, IPrivateEntity, new()
            where TDbContextLocator : class, IDbContextLocator
        {
            var q = rep.AsQueryable();
            if (noTracking)
            {
                q = q.AsNoTracking();
            }
            return q;
        }

        public static IQueryable<TEntity> GetQueryable<TEntity>(this IRepository<TEntity> rep, bool noTracking = true)
            where TEntity : class, IPrivateEntity, new()
        {
            var q = rep.AsQueryable();
            if (noTracking)
            {
                q = q.AsNoTracking();
            }
            return q;
        }
    }
}