using AsbCloudApp.Data;
using AsbCloudApp.Services;
using AsbCloudWebApi.SignalR;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.SignalR;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace AsbCloudWebApi.Controllers
{
    /// <summary>
    /// Контроллер отчетов по буровым скважинам
    /// </summary>
    [Route("api/report")]
    [ApiController]
    public class ReportController : ControllerBase
    {
        private readonly IReportService reportService;
        private readonly IFileService fileService;
        private readonly IWellService wellService;
        private readonly IHubContext<ReportsHub> reportsHubContext;

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

        private void HandleReportProgressAsync(float progress, string operation, int id) =>
            Task.Run(() =>
            {
                reportsHubContext.Clients.Group($"Report_{id}").SendAsync(
                    nameof(IReportHubClient.GetReportProgress),
                    new { Progress = progress, Operation = operation, ReportName = "" }
                ).ConfigureAwait(false);
            });

        private void HandleReportNameAsync(string reportName, int groupId) =>
            Task.Run(() =>
            {
                reportsHubContext.Clients.All.SendAsync(
                    nameof(IReportHubClient.GetReportProgress),
                    new { Progress = 100, Operation = "Отчет успешно создан", ReportName = reportName }
                ).ConfigureAwait(false);
            });


        /// <summary>
        /// Создает отчет по скважине с указанными параметрами
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="idUser">id пользователя</param>
        /// <param name="stepSeconds">шаг интервала</param>
        /// <param name="format">формат отчета (0-PDF, 1-LAS)</param>
        /// <param name="begin">дата начала интервала</param>
        /// <param name="end">дата окончания интервала</param>
        /// <param name="token">Токен для отмены задачи</param>
        /// <returns>id фоновой задачи формирования отчета</returns>
        [HttpPost]
        [Route("{idWell}/report")]
        [ProducesResponseType(typeof(int), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> CreateReportAsync(int idWell, int idUser, int stepSeconds, int format,
            DateTime begin = default, DateTime end = default,
            CancellationToken token = default)
        {
            int? idCompany = User.GetCompanyId();

            if (idCompany is null)
                return Forbid();

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

            var id = reportService.CreateReport(idWell, idUser,
                stepSeconds, format, begin, end, HandleReportProgressAsync, HandleReportNameAsync);

            return Ok(id);
        }

        /// <summary>
        /// Возвращает файл-отчет с диска на сервере
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="reportName">имя запрашиваемого файла (отчета)</param>
        /// <param name="token">Токен для отмены задачи</param>
        /// <returns>файл с отчетом</returns>
        [HttpGet]
        [Route("{idWell}/{reportName}")]
        [ProducesResponseType(typeof(PhysicalFileResult), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> GetReportAsync([FromRoute] int idWell, 
            string reportName, CancellationToken token = default)
        {
            try
            {
                int? idCompany = User.GetCompanyId();

                if (idCompany is null)
                    return Forbid();

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

                // TODO: словарь content typoв
                var relativePath = Path.Combine(fileService.RootPath, $"{idWell}",
                    $"{reportService.ReportCategoryId}", reportName);
                return PhysicalFile(Path.GetFullPath(relativePath), "application/pdf", reportName);
            }
            catch (FileNotFoundException ex)
            {
                return NotFound($"Файл не найден. Текст ошибки: {ex.Message}");
            }
        }

        /// <summary>
        /// Возвращает имена отчетов, хранящихся на диске, 
        /// которые подходят под указанные параметры
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="stepSeconds">шаг интервала</param>
        /// <param name="format">формат отчета (0-PDF, 1-LAS)</param>
        /// <param name="begin">дата начала интервала</param>
        /// <param name="end">дата окончания интервала</param>
        /// <param name="token">Токен для отмены задачи</param>
        /// <returns>Список имен существующих отчетов (отчетов)</returns>
        [HttpGet]
        [Route("{idWell}/suitableReports")]
        [ProducesResponseType(typeof(IEnumerable<string>), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> GetSuitableReportsNamesAsync(int idWell, int stepSeconds, int format,
            DateTime begin = default, DateTime end = default,
            CancellationToken token = default)
        {
            var suitableReportsNames = await reportService.GetSuitableReportsAsync(idWell, 
                begin, end, stepSeconds, format, token).ConfigureAwait(false);

            if (suitableReportsNames is null || !suitableReportsNames.Any())
                return NoContent();

            return Ok(suitableReportsNames);
        }

        /// <summary>
        /// Возвращает прогнозируемое количество страниц будущего отчета
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="begin">дата начала интервала</param>
        /// <param name="end">дата окончания интервала</param>
        /// <param name="stepSeconds">шаг интервала</param>
        /// <param name="format">формат отчета (0-PDF, 1-LAS)</param>
        /// <param name="token">Токен для отмены задачи</param>
        /// <returns>прогнозируемое кол-во страниц отчета</returns>
        [HttpGet]
        [Route("{idWell}/reportSize")]
        [ProducesResponseType(typeof(string), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> GetReportSizeAsync(int idWell, 
            int stepSeconds, int format, DateTime begin = default, 
            DateTime end = default, CancellationToken token = default)
        {
            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, 
                begin, end, stepSeconds, 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]
        [Route("{idWell}/reportsDatesRange")]
        [ProducesResponseType(typeof(DatesRangeDto), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> GetReportsDateRangeAsync(int idWell, 
            CancellationToken token = default)
        {
            int? idCompany = User.GetCompanyId();

            if (idCompany is null)
                return Forbid();

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

            DatesRangeDto wellReportsDatesRange = await reportService.GetReportsDatesRangeAsync(idWell,
                token).ConfigureAwait(false);

            return Ok(wellReportsDatesRange);
        }
    }
}