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

namespace AsbCloudInfrastructure.Services
{
    public class WellCompositeOperationService : IWellCompositeOperationService
    {
        private IAsbCloudDbContext db;

        /// <summary>
        /// Тип секции "Транспортный стол"
        /// </summary>
        private const int wellSectionTransportTable = 5;

        /// <summary>
        /// Тип секции "Эксплуатационная колонна"
        /// </summary>
        private const int wellSectionProductionString = 4;


        /// <summary>
        /// набор настроек для замены одной категории секции на другую
        /// </summary>
        private static Dictionary<(int, int), int> SettingsForSectionCategoryChange = new Dictionary<(int, int), int>() {
             { (2, 5096), 5013 },
             { (2, 5008), 5013 },
             { (3, 5096), 5084 },
             { (3, 5008), 5084 },
             { (3, 5085), 5015 },
             { (3, 5014), 5015 },
             { (31, 5014), 5015 },
             { (31, 5012), 5013 },
             { (31, 5083), 5013 },
             { (4, 5085), 5015 },
             { (4, 5087), 5015 },
             { (4, 5014), 5015 },
             { (4, 5053), 5037 },
             { (4, 5084), 5096 },
             { (4, 5086), 5013 },
             { (6, 5085), 5015 },
             { (6, 5036), 5034 },
             { (6, 5035), 5097 }
        };

        private Dictionary<int, List<int>> WellSectionTypesWithCategories = new Dictionary<int, List<int>>()
        {
            { 2, new List<int>{ 5001, 5003, 5013, 5000, 5022, 5017, 5023, 4007, 5090 } },
            { 3, new List<int>{ 5001, 5015, 5037, 5057, 5003, 5036, 5084, 5013, 5000, 5022, 5017, 4007, 5090, 5045, 5042, 5046 } },
            { 31, new List<int>{ 5001, 5015, 5037, 5057, 5003, 5036, 5013, 5022, 5017, 5023, 4007, 5045, 5042, 5046 } },
            { 4, new List<int>{ 5001, 5015, 5046, 5037, 5097, 5057, 5003, 5036, 5008, 5003, 5036, 5013, 5000, 5029, 5022, 5017, 5019, 5042, 5046 } },
            { 6, new List<int>{ 5001, 5015, 5034, 5037, 5097, 5057, 5003 } },
        };



        public WellCompositeOperationService(IAsbCloudDbContext db)
        {
            this.db = db;
        }

        public async Task<List<Dictionary<int, WellOperationDataDto>>> GetAsync(IEnumerable<int> idsWells, CancellationToken token)
        {
            var sections = await db.WellSectionTypes
                .Select(t => t.Adapt<WellSectionTypeDto>())
                .ToArrayAsync(token);
            var sectionsDict = sections.ToDictionary(s => s.Id, s => s.Caption);

            var categories = await db.WellOperationCategories
                .Select(c => c.Adapt<WellOperationCategoryDto>())
                .ToArrayAsync(token);
            var categoriesDict = categories.ToDictionary(s => s.Id, s => s.Name);

            var idsWellSectionTypes = WellSectionTypesWithCategories.Select(t => t.Key);

            var groupedWellOperations = db.WellOperations
                .Where(o => idsWells.Contains(o.IdWell))
                .Where(o => o.IdType == WellOperation.IdOperationTypeFact)
                .Where(o => idsWellSectionTypes.Contains(o.IdWellSectionType))
                .AsEnumerable()
                .GroupBy(o => o.IdWellSectionType, (key, group) => group.Where(x => WellSectionTypesWithCategories[key].Contains(x.IdCategory)))
                .SelectMany(o => o)
                .Select(x => Convert(x, sectionsDict, categoriesDict))
                .GroupBy(o => (o.IdWellSectionType, o.IdCategory, o.IdWell), (gr, o) => o.Count() == 1 ? o.FirstOrDefault()! : new WellOperationDataDto()
                {
                    IdWellSectionType = o.FirstOrDefault()!.IdWellSectionType,
                    IdCategory = o.FirstOrDefault()!.IdCategory,
                    DepthStart = o.Max(x => x.DepthStart),
                    DurationHours = o.Sum(x => x.DurationHours),
                    IdWell = o.FirstOrDefault()!.IdWell,
                    WellSectionTypeCaption = o.FirstOrDefault()!.WellSectionTypeCaption,
                    OperationCategoryName = o.FirstOrDefault()!.OperationCategoryName
                });

            var wellOperationsWithComposite = new List<Dictionary<int, WellOperationDataDto>>();
            var operationsGroupBySectionAndCategory = groupedWellOperations.GroupBy(o => (o.IdWellSectionType, o.IdCategory), (key, group) => group.ToList());
            foreach (var operationGroupBySectionAndCategory in operationsGroupBySectionAndCategory)
            {
                var dictElem = operationGroupBySectionAndCategory.ToDictionary(o => o.IdWell);

                var currentOperation = operationGroupBySectionAndCategory.FirstOrDefault()!;
                var composite = new WellOperationDataDto()
                {
                    IdWell = 0,
                    IdCategory = currentOperation.IdCategory,
                    IdWellSectionType = currentOperation.IdWellSectionType,
                    DurationHours = currentOperation.DurationHours,
                    DepthStart = currentOperation.DepthStart,
                    OperationCategoryName = currentOperation.OperationCategoryName,
                    WellSectionTypeCaption = currentOperation.WellSectionTypeCaption,
                };
                dictElem.Add(0, composite);

                if (operationGroupBySectionAndCategory.Count() == 1)
                {
                    wellOperationsWithComposite.Add(dictElem);
                    continue;
                }

                var maxDurationHours = operationGroupBySectionAndCategory.Max(o => o.DurationHours);
                var minDurationHours = operationGroupBySectionAndCategory.Min(o => o.DurationHours);
                if (maxDurationHours == minDurationHours)
                {
                    composite.DepthStart = operationGroupBySectionAndCategory.Max(o => o.DepthStart);
                }
                else
                {
                    composite.DepthStart = operationGroupBySectionAndCategory.Min(o => o.DepthStart);
                }
                composite.DurationHours = minDurationHours;
                dictElem[0] = composite;
                wellOperationsWithComposite.Add(dictElem);
            }
            return wellOperationsWithComposite;
        }

        private static WellOperationDataDto Convert(WellOperation entity, Dictionary<int, string> sectionsDict, Dictionary<int, string> categoriesDict)
        {
            var dto = new WellOperationDataDto();
            dto.IdWellSectionType = entity.IdWellSectionType == wellSectionTransportTable
                ? wellSectionProductionString
                : entity.IdWellSectionType;
            dto.IdCategory = (SettingsForSectionCategoryChange.TryGetValue(((entity.IdWellSectionType == wellSectionTransportTable ? wellSectionProductionString : entity.IdWellSectionType), entity.IdCategory), out int newIdCategory))
                ? newIdCategory
                : entity.IdCategory;
            dto.DepthStart = entity.DepthStart;
            dto.DurationHours = entity.DurationHours;
            dto.IdWell = entity.IdWell;
            dto.OperationCategoryName = categoriesDict.TryGetValue(dto.IdCategory, out string? CategoryName)
                ? CategoryName
                : string.Empty;
            dto.WellSectionTypeCaption = sectionsDict.TryGetValue(dto.IdWellSectionType, out string? WellSectionName)
                        ? WellSectionName
                        : string.Empty;

            return dto;
        }
    }
}