using AsbCloudApp.Data;
using AsbCloudApp.Services;
using AsbCloudDb.Model;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Mapster;
using Microsoft.EntityFrameworkCore;
using System.Threading.Tasks;
using System.Threading;
using AsbCloudInfrastructure.Services.Cache;

namespace AsbCloudInfrastructure.Services
{
    public class WellSectionService: IWellSectionService
    {
        private readonly IAsbCloudDbContext context;
        private readonly DbSet<WellSection> dbSet;
        private readonly CacheTable<WellSectionType> cachedSectionsTypes;

        public WellSectionService(IAsbCloudDbContext context, Cache.CacheDb cache)
        {
            this.context = context;
            dbSet = context.Set<WellSection>();
            cachedSectionsTypes = cache.GetCachedTable<WellSectionType>((DbContext)context);
        }

        public async Task<PaginationContainer<WellSectionDto>> GetAllByWellIdAsync(int idWell, int skip, int take, CancellationToken token = default)
        {
            var query = dbSet
                .Include(s => s.WellSectionType)
                .Where(s => s.IdWell == idWell)
                .AsNoTracking();

            var result = new PaginationContainer<WellSectionDto>
            {
                Skip = skip,
                Take = take,
                Count = await query.CountAsync(token).ConfigureAwait(false),
            };

            query = query
                .OrderBy(e => e.WellDepthPlan);

            if (skip > 0)
                query = query.Skip(skip);

            query = query.Take(take);

            var entities = await query.Take(take).ToListAsync(token).ConfigureAwait(false);

            foreach (var item in entities)
            {
                var dto = item.Adapt<WellSectionDto>();
                dto.SectionType = item.WellSectionType.Caption;
                result.Items.Add(dto);
            }

            return result;
        }

        public async Task<WellSectionDto> GetAsync(int id, CancellationToken token = default)
        {
            var entity = await dbSet
                .Include(s => s.WellSectionType)
                .FirstOrDefaultAsync(e => e.Id == id, token)
                .ConfigureAwait(false);

            var dto = entity.Adapt<WellSectionDto>();
            dto.SectionType = entity.WellSectionType.Caption;
            return dto;
        }

        public async Task<WellSectionDto> InsertAsync(WellSectionDto item, int idWell, CancellationToken token = default)
        {
            if(string.IsNullOrEmpty(item.SectionType))
                throw new ArgumentException("Тип секции должен быть указан", nameof(WellSectionDto.SectionType));

            var sectionType = await cachedSectionsTypes
                .FirstOrDefaultAsync(s => s.Caption == item.SectionType, token)
                .ConfigureAwait(false);

            if (sectionType is null)
            { 
                throw new ArgumentException("Тип секции отсутствует в справочнике", nameof(WellSectionDto.SectionType));
                //sectionType = await cachedSectionsTypes.InsertAsync(new WellSectionType { Caption = item.SectionType}, token);
            }

            var entity = item.Adapt<WellSection>();
            entity.Id = default;
            entity.IdWell = idWell;
            entity.IdWellSectionType = sectionType.Id;
            var dbEntity = dbSet.Add(entity);
            await context.SaveChangesAsync(token).ConfigureAwait(false);
            return dbEntity.Entity.Adapt<WellSectionDto>();
        }
        
        public Task<IEnumerable<WellSectionDto>> InsertRangeAsync(IEnumerable<WellSectionDto> newItems, int idWell, CancellationToken token = default)
        {
            throw new NotImplementedException();
        }

        public async Task<WellSectionDto> UpdateAsync(WellSectionDto item, int idSection, int idWell, CancellationToken token = default)
        {
            if (string.IsNullOrEmpty(item.SectionType))
                throw new ArgumentException("Тип секции должен быть указан", nameof(WellSectionDto.SectionType));

            var sectionType = await cachedSectionsTypes
                .FirstOrDefaultAsync(s => s.Caption == item.SectionType, token)
                .ConfigureAwait(false);

            if (sectionType is null)
            {
                throw new ArgumentException("Тип секции отсутствует в справочнике", nameof(WellSectionDto.SectionType));
                //sectionType = await cachedSectionsTypes.InsertAsync(new WellSectionType { Caption = item.SectionType}, token);
            }

            var entity = item.Adapt<WellSection>();
            entity.Id = idSection;
            entity.IdWell = idWell;
            entity.IdWellSectionType = sectionType.Id;
            var dbEntity = dbSet.Update(entity);
            await context.SaveChangesAsync(token).ConfigureAwait(false);
            return dbEntity.Entity.Adapt<WellSectionDto>();
        }

        public Task<int> DeleteAsync(int id, CancellationToken token = default)
        {
            var entity = dbSet.FirstOrDefault(e => e.Id == id);
            if (entity == default)
                return Task.FromResult(0);
            dbSet.Remove(entity);
            return context.SaveChangesAsync(token);
        }

        public Task<int> DeleteAsync(IEnumerable<int> ids, CancellationToken token = default)
        {
            throw new NotImplementedException();
        }
    }
}