using AutoMapper;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using PARR.API.Contracts.V1;
using PARR.API.Contracts.V1.Requests.BaseRequests;
using PARR.API.Contracts.V1.Responses;
using PARR.API.Contracts.V1.Responses.Base;
using PARR.API.Contracts.V1.Responses.Statistics;
using PARR.API.Controllers.V1.Base;
using PARR.Constants;
using PARR.DAL.DomainServices.Shortcodes;
using PARR.DAL.Models;
using PARR.DAL.Models.Job;
using PARR.DAL.NextRunServices;
using PARR.DAL.Services.Interfaces;
using PARR.DAL.Services.Interfaces.Job;

namespace PARR.API.Controllers.V1.Statistics
{
    /// <summary>
    /// Статистика распределения шаблонов
    /// </summary>
    [Authorize(Roles = ParrRoles.Administrator.Role)]
    public class StatTemplateDistributionController : BaseApiController
    {
        private readonly ITemplateService templateService;
        private readonly IJobGroupService jobGroupService;
        private readonly IMapper mapper;
        private readonly IShortcodesService shortcodesService;
        private readonly INextRunService nextRunService;
        private readonly ILogger<StatTemplateDistributionController> logger;

        public StatTemplateDistributionController(
            ITemplateService templateService,
            IJobGroupService jobGroupService,
            IMapper mapper,
            IShortcodesService shortcodesService,
            INextRunService nextRunService,
            ILogger<StatTemplateDistributionController> logger
            )
        {
            this.templateService = templateService;
            this.jobGroupService = jobGroupService;
            this.mapper = mapper;
            this.shortcodesService = shortcodesService;
            this.nextRunService = nextRunService;
            this.logger = logger;
        }


        /// <summary>
        /// Статистика распределения шаблонов по jobGroupId, только для Used
        /// </summary>
        /// <param name="jobGroupId"></param>
        /// <returns></returns>
        [HttpGet(ApiRoutes.StatTemplateDistribution.Get)]
        public async Task<IActionResult> Get([FromRoute] Guid jobGroupId, [FromQuery] TimeZoneOffsetClient timeZoneQuery)
        {
            // eadc5498-dba6-4f10-9b4b-a1653e3c3e61

            //TODO: похоже что timeZoneQuery лишняя

            var jobGroup = await jobGroupService.Get()
                                    .Include(t => t.DistributionConfig)
                                        .ThenInclude(t => t.DistributionPeriod)
                                    .AsNoTracking()
                                    .FirstOrDefaultAsync(t => t.Id == jobGroupId);

            if (jobGroup == null)
                return BadRequest(new Response(false, new List<ErrorModel> { new ErrorModel { Message = "Не найдена группа работ" } }));

            if (!jobGroup.IsAutoDistributionEnabled || jobGroup.DistributionConfig == null)
                return BadRequest(new Response(false, new List<ErrorModel> { new ErrorModel { Message = "Для группы работ не включено автораспределение" } }));

            var items = await templateService.Get()
                                    .Where(t => t.Job!.GroupId == jobGroupId && t.StatusTypeId == TemplateStatusTypeEnum.Used)
                                    .Select(t => new
                                    {
                                        WorkGroup = t.Job!.WorkGroupMask,
                                        Template = t
                                    })
                                    .AsNoTracking()
                                    .ToListAsync();

            if (!items.Any())
                return Ok(new Response<StatTemplateDistributorResponse>(new StatTemplateDistributorResponse
                {
                    JobGroup = mapper.Map<JobGroupWithDistributionConfigResponse>(jobGroup),
                    ItemsList = null
                }, true));

            var (dateStart, dateEnd) = GetStartEndPeriod(jobGroup, items.Max(t => t.Template.NextRun), timeZoneQuery.TimeZoneOffsetHours);

            // получаем список рабочих дней
            // получет все дни, даже с выходными, чтоб видеть реальную картину
            var workDays = await nextRunService.GetWorkDaysAsync(dateStart, dateEnd, false, jobGroup.ReferenceDate);

            // получить список выходных дней (показываем только если IsExcludeWeekends = true)
            var weekends = jobGroup.DistributionConfig.IsExcludeWeekends
                                        ? await nextRunService.GetWeekendsAsync(dateStart, dateEnd, jobGroup.ReferenceDate)
                                        : new HashSet<DateOnly>();

            var responseItemsList = new List<StatDistributorItemResponse>();

            if (jobGroup.DistributionConfig.IsGroupingByWorkGroup)
            {
                // тут группируем по рабочим группам

                // Получаем список пар (WorkGroupName, Template)
                var templatesWithWorkGroupNames = new List<(string WorkGroupName, Template Template)>();

                // получаем названия рабочих групп
                foreach (var item in items)
                {
                    var workGroupName = await shortcodesService.ApplyShortcodesAsync(item.WorkGroup, item.Template);
                    templatesWithWorkGroupNames.Add((workGroupName, item.Template));
                }

                // Группируем по WorkGroupName
                var grouped = templatesWithWorkGroupNames
                                    .GroupBy(x => x.WorkGroupName)
                                    .ToDictionary(g => g.Key, g => g.Select(x => x.Template).ToList());

                foreach (var groupedItem in grouped)
                {
                    var statResult = GetResponseByWorkGroup(groupedItem.Key, groupedItem.Value, workDays, weekends, timeZoneQuery.TimeZoneOffsetHours, jobGroup.ReferenceDate);
                    responseItemsList.Add(statResult);
                }
            }
            else
            {
                // не нужно группировать по рабочим группам

                // сразу формируем response
                responseItemsList.Add(GetResponseByWorkGroup(null, items.Select(t => t.Template).ToList(), workDays, weekends, timeZoneQuery.TimeZoneOffsetHours, jobGroup.ReferenceDate));
            }

            var response = new StatTemplateDistributorResponse
            {
                JobGroup = mapper.Map<JobGroupWithDistributionConfigResponse>(jobGroup),
                ItemsList = responseItemsList.OrderBy(t => t.WorkGroupName).ToList()
            };

            return Ok(new Response<StatTemplateDistributorResponse>(response, true));
        }

        /// <summary>
        /// Получить дату начала и конца периода
        /// </summary>
        /// <param name="jobGroup"></param>
        /// <param name="maxNextRunTemplate"></param>
        /// <param name="timeZoneOffsetHours"></param>
        /// <returns></returns>
        private (DateOnly dateStart, DateOnly dateEnd) GetStartEndPeriod(JobGroup jobGroup, DateTimeOffset maxNextRunTemplate, int timeZoneOffsetHours)
        {
            var durationDays = nextRunService.GetDurationDays(jobGroup.DistributionConfig!);

            var dateStart = DateOnly.FromDateTime(DateTime.UtcNow.AddHours(timeZoneOffsetHours));

            // последний день, не может быть меньше чем durationDays
            var dateEnd = dateStart.AddDays(durationDays);

            // последний день, не может быть меньше чем refDate+durationDays
            var sumRefDuration = DateOnly.FromDateTime(jobGroup.ReferenceDate.AddHours(timeZoneOffsetHours).AddDays(durationDays).Date);
            if (dateEnd < sumRefDuration)
                dateEnd = sumRefDuration;

            // с DateEnd вообще какая-то шурпатня :(
            // как наглядно понять ок не ок распределяется, если на каком-то графике dateEnd может ухеать за период распределения
            // последний день, не может быть меньше чем дата последнего шаблона maxNextRunTemplate
            var lastTempalteDate = DateOnly.FromDateTime(maxNextRunTemplate.AddHours(timeZoneOffsetHours).Date);
            if (dateEnd < lastTempalteDate)
                dateEnd = lastTempalteDate;

            return (dateStart, dateEnd);
        }

        /// <summary>
        /// Заполнить респонс
        /// </summary>
        /// <param name="workGroupName"></param>
        /// <param name="templates"></param>
        /// <param name="workDays"></param>
        /// <param name="timeZoneOffsetHours"></param>
        /// <returns></returns>
        private StatDistributorItemResponse GetResponseByWorkGroup(string? workGroupName, List<Template> templates, List<DateOnly> workDays, HashSet<DateOnly> weekends, int timeZoneOffsetHours, DateTimeOffset referenceDate)
        {
            var result = new StatDistributorItemResponse
            {
                WorkGroupName = workGroupName,
                Statistics = workDays.OrderBy(t => t).Select(t => new StatTemplateDistributorDateStat
                {
                    AllCount = 0,
                    Date = new DateTimeOffset(t.Year, t.Month, t.Day, referenceDate.Hour, referenceDate.Minute, referenceDate.Second, referenceDate.Offset),
                    IsWorkDay = !weekends.Contains(t),
                    IsActivatedCount = 0,
                    IsDeactivatedCount = 0,
                    Templates = new List<StatTempleteDistribItem>()
                }).ToList()
            };

            //foreach (var templatesFromDate in templates.GroupBy(t => DateOnly.FromDateTime(t.NextRun.Date)))
            // смещаем по часовой зоне и группируем по дате
            foreach (var templatesFromDate in templates.GroupBy(t => DateOnly.FromDateTime(t.NextRun.AddHours(timeZoneOffsetHours).Date)))
            {
                var statisticsForDate = result.Statistics.FirstOrDefault(t => DateOnly.FromDateTime(t.Date.AddHours(timeZoneOffsetHours).Date) == templatesFromDate.Key);
                if (statisticsForDate == null)
                {
                    logger.LogWarning("В списке рабочих дней, нет дня для шаблонов {count} шт. выполняющихся в {date}", templatesFromDate.Count(), templatesFromDate.Key);
                    continue;
                }

                statisticsForDate.AllCount = templatesFromDate.Count();
                statisticsForDate.IsDeactivatedCount = templatesFromDate.Count(t => !t.IsActiveTemplate || !t.IsActiveSchedule);
                statisticsForDate.IsActivatedCount = templatesFromDate.Count(t => t.IsActiveTemplate && t.IsActiveSchedule);
                statisticsForDate.Templates = templatesFromDate.Select(t => new StatTempleteDistribItem
                {
                    Name = t.Name,
                    IsActiveSchedular = t.IsActiveSchedule,
                    IsActiveTemplate = t.IsActiveTemplate,
                    NextRun = t.NextRun
                })
                .OrderBy(t => t.Name)
                .ToList();
            }

            return result;
        }




    }
}