using Hncore.Infrastructure.Data;
using Hncore.Infrastructure.DDD;
using Hncore.Infrastructure.EF;
using Hncore.Infrastructure.EntitiesExtension;
using Hncore.Infrastructure.WebApi;
using Microsoft.AspNetCore.Http;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Threading.Tasks;

namespace Hncore.Infrastructure.Service
{

    public interface IFindService
    {

    }

    public class ServiceBase<TEntity> : IFindService where TEntity : class
    {
        IHttpContextAccessor m_HttpContextAccessor;

        public HttpContext HttpContext
        {
            get => m_HttpContextAccessor.HttpContext;
        }
        public ManageUserInfo ManagerInfo
        {
            get => HttpContext.Request.GetManageUserInfo();
        }
        protected DbContextBase m_DbContextBase { get; set; }
        public ServiceBase(DbContextBase dbContext, IHttpContextAccessor httpContextAccessor)
        {
            m_DbContextBase = dbContext;
            m_HttpContextAccessor = httpContextAccessor;
        }


        public virtual async Task<TEntity> GetById(object id)
        {
            return await m_DbContextBase.Set<TEntity>().FindByIdAsync(id);
        }

        public virtual async Task<TEntity> Add(TEntity entity, bool autoSave = true)
        {
            var ret = await m_DbContextBase.Set<TEntity>().AddAsync(entity);
            if (autoSave)
                await m_DbContextBase.SaveChangesAsync();
            return ret.Entity;
        }
        public virtual async Task Adds(IEnumerable<TEntity> entitys, bool autoSave = true)
        {
            await m_DbContextBase.Set<TEntity>().AddRangeAsync(entitys);
            if (autoSave)
                await m_DbContextBase.SaveChangesAsync();
        }
        public virtual async Task<bool> DeleteById(object id, bool autoSave = true)
        {
            var entity = await this.GetById(id);           
            return await Delete(entity, autoSave);
        }

        public virtual async Task<bool> Delete(TEntity entity, bool autoSave = true)
        {
            //if (entity is ITenant)
            //{
            //    var tenantId = HttpContext.Request.GetManageUserInfo()?.TenantId;
            //    if (tenantId.HasValue && tenantId > 0 && (entity as ITenant).TenantId != tenantId)
            //    {
            //        return false;
            //    }
            //}

            if (entity is ISoftDelete)
            {
                (entity as ISoftDelete).DeleteTag = 1;
                m_DbContextBase.Set<TEntity>().Update(entity);
            }
            else
            {
                m_DbContextBase.Set<TEntity>().Remove(entity);              
            }
            if (autoSave)
                await m_DbContextBase.SaveChangesAsync();
            return true;
        }

        public virtual async Task<bool> Deletes(IEnumerable<TEntity> entitys, bool autoSave = true)
        {
            if (entitys == null || entitys.Count() == 0)
                return false;

            var entity = entitys.FirstOrDefault();            

            if (entity is ISoftDelete)
            {
                foreach(var item in entitys) { (entity as ISoftDelete).DeleteTag = 1; }               
                m_DbContextBase.Set<TEntity>().UpdateRange(entity);
            }
            else
            {
                m_DbContextBase.Set<TEntity>().RemoveRange(entity);
            }
            if (autoSave)
                await m_DbContextBase.SaveChangesAsync();
            return true;
        }


        public virtual async Task<bool> Update(TEntity entity, bool autoSave = true)
        {
            //if (entity is ITenant)
            //{
            //    var tenantId = HttpContext.Request.GetManageUserInfo()?.TenantId;
            //    if (tenantId.HasValue && tenantId > 0 && (entity as ITenant).TenantId != tenantId)
            //    {
            //        return false;
            //    }
            //}
            m_DbContextBase.Set<TEntity>().Update(entity);
            if (autoSave)
                return (await m_DbContextBase.SaveChangesAsync()) > 0;
            return true;
        }

        public virtual async Task<bool> Update(IEnumerable<TEntity> list, bool autoSave = true)
        {
            m_DbContextBase.Set<TEntity>().UpdateRange(list);
            if (autoSave)
                await m_DbContextBase.SaveChangesAsync();
            return true;
        }
        public virtual IQueryable<TEntity> Query(bool noTracking = false)
        {
            var ret = m_DbContextBase.Set<TEntity>().AsQueryable();
            if (noTracking)
            {
                ret = ret.AsNoTracking();
            }
            return ret;
        }
        public async virtual Task<List<TEntity>> GetAll(bool noTracking = false)
        {
            var ret = m_DbContextBase.Set<TEntity>().AsQueryable();
            if (noTracking)
            {
                ret = ret.AsNoTracking();
            }
            return await ret.ToListAsync();
        }
        public virtual IQueryable<TEntity> Query(Expression<Func<TEntity, bool>> exp=null, bool noTracking = false)
        {
            var ret = m_DbContextBase.Set<TEntity>().AsQueryable();
            if (exp != null)
            {
                ret = ret.Where(exp);
            }
            if (noTracking)
            {
                ret = ret.AsNoTracking();
            }
            return ret;
        }
        public virtual async Task<PageData<TEntity>> Page(int page, int limit, Expression<Func<TEntity, bool>> exp = null, bool noTracking = false)
        {
            var ret = await Query(exp, noTracking).ListPagerAsync(limit, page, true);
            return ret;
        }

        public virtual async Task<PageData<TEntity>> PageDesc<TOrderKey>(int page, int limit, Expression<Func<TEntity, bool>> exp = null, bool noTracking = false, Expression<Func<TEntity, TOrderKey>> order = null)
        {

            var query = Query(exp, noTracking);
            if (order != null)
                query = query.OrderByDescending(order);

            var ret = await query.ListPagerAsync(limit, page, true);
            return ret;
        }

        public virtual async Task<PageData<TEntity>> PageAsc<TOrderKey>(int page, int limit, Expression<Func<TEntity, bool>> exp = null, bool noTracking = false, Expression<Func<TEntity, TOrderKey>> order = null)
        {

            var query = Query(exp, noTracking);
            if (order != null)
                query = query.OrderBy(order);

            var ret = await query.ListPagerAsync(limit, page, true);
            return ret;
        }

        public virtual bool Exist(Expression<Func<TEntity, bool>> expr)
        {
            return this.Query(expr).Count() > 0;         
        }

        public  async Task<bool> Save()
        {
            return (await m_DbContextBase.SaveChangesAsync()) > 0;
        }
    }
}