using AsbCloudApp.Data;
using AsbCloudApp.Services;
using AsbCloudWebApi.SignalR;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.SignalR;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Threading;
using System.Threading.Tasks;
using AsbCloudApp.Requests;
using AsbCloudWebApi.SignalR.Clients;

namespace AsbCloudWebApi.Controllers
{
    /// <summary>
    /// Отчет (временная диаграмма с сообщениями)
    /// </summary>
    [Route("api/well/{idWell}/report")]
    [ApiController]
    public class ReportController : ControllerBase
    {
        private readonly IReportService reportService;
        private readonly IWellService wellService;
        private readonly IHubContext<ReportsHub, IReportHubClient> reportsHubContext;

        public ReportController(
            IReportService reportService, 
            IWellService wellService, 
            IHubContext<ReportsHub, 
            IReportHubClient> reportsHubContext)
        {
            this.reportService = reportService;
            this.wellService = wellService;
            this.reportsHubContext = reportsHubContext;
        }

        /// <summary>
        /// Создает отчет по скважине с указанными параметрами
        /// </summary>
        /// <param name="idWell">Id скважины</param>
        /// <param name="request">Параметры запроса</param>
        /// <param name="token">Токен для отмены задачи</param>
        /// <returns>id фоновой задачи формирования отчета</returns>
        [HttpPost]
        [Permission]
        [ProducesResponseType(typeof(int), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> CreateReportAsync([Required] int idWell, 
            [FromQuery] ReportParametersRequest request, 
            CancellationToken token)
        {
            var idCompany = User.GetCompanyId();
            var idUser = User.GetUserId();

            if ((idCompany is null) || (idUser is null))
                return Forbid();

            if (!await wellService.IsCompanyInvolvedInWellAsync((int)idCompany, 
                    idWell, token).ConfigureAwait(false))
                return Forbid();

            void HandleReportProgressAsync(object progress, string id) =>
                Task.Run(async() =>
                {
                    await reportsHubContext.Clients.Group($"Report_{id}")
                        .GetReportProgress(progress, token);
                }, token);

            var id = reportService.EnqueueCreateReportWork(idWell, (int)idUser, request, HandleReportProgressAsync);

            return Ok(id);
        }

        /// <summary>
        /// Возвращает имена всех отчетов по скважине
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="token">Токен для отмены задачи</param>
        /// <returns>Список имен существующих отчетов (отчетов)</returns>
        [HttpGet]
        [Permission]
        [ProducesResponseType(typeof(IEnumerable<string>), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> GetAllReportsNamesByWellAsync(int idWell, CancellationToken token)
        {
            int? idCompany = User.GetCompanyId();

            if (idCompany is null)
                return Forbid();

            if (!await wellService.IsCompanyInvolvedInWellAsync((int)idCompany,
                idWell, token).ConfigureAwait(false))
                return Forbid();

            var reports = await reportService.GetAllReportsByWellAsync(idWell, token).ConfigureAwait(false);

            return Ok(reports);
        }

        /// <summary>
        /// Возвращает прогнозируемое количество страниц будущего отчета
        /// </summary>
        /// <param name="idWell">Id скважины</param>
        /// <param name="request">Параметры запроса</param>
        /// <param name="token">Токен для отмены задачи</param>
        /// <returns>прогнозируемое кол-во страниц отчета</returns>
        [HttpGet("reportSize")]
        [Permission]
        [ProducesResponseType(typeof(string), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> GetReportSizeAsync([Required] int idWell, 
            [FromQuery] ReportParametersRequest request,
            CancellationToken token)
        {
            int? idCompany = User.GetCompanyId();

            if (idCompany is null)
                return Forbid();

            if (!await wellService.IsCompanyInvolvedInWellAsync((int)idCompany, 
                    idWell, token).ConfigureAwait(false))
                return Forbid();
        
            int reportSize = reportService.GetReportPagesCount(idWell,
                request.Begin, request.End, request.StepSeconds, request.Format);

            return Ok(reportSize);
        }

        /// <summary>
        /// Возвращает даты самого старого и самого свежего отчетов в БД
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="token">Токен для отмены задачи</param>
        /// <returns>Даты самого старого и самого свежего отчетов в БД</returns>
        [HttpGet("datesRange")]
        [Permission]
        [ProducesResponseType(typeof(DatesRangeDto), (int)System.Net.HttpStatusCode.OK)]
        [ProducesResponseType((int)System.Net.HttpStatusCode.NoContent)]
        public async Task<IActionResult> GetReportsDateRangeAsync(int idWell, CancellationToken token)
        {
            int? idCompany = User.GetCompanyId();

            if (idCompany is null)
                return Forbid();

            if (!await wellService.IsCompanyInvolvedInWellAsync((int)idCompany,
                idWell, token).ConfigureAwait(false))
                return Forbid();

            var wellReportsDatesRange = reportService.GetDatesRangeOrDefault(idWell);

            if (wellReportsDatesRange is null)
                return NoContent();

            if (wellReportsDatesRange.From == wellReportsDatesRange.To)
                return NoContent();

            return Ok(wellReportsDatesRange);
        }
    }
}