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

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

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

        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 }
                );
            });


        /// <summary>
        /// Создает отчет по скважине с указанными параметрами
        /// </summary>
        /// <param name="wellId">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>
        /// <returns>id фоновой задачи формирования отчета</returns>
        [HttpPost]
        [Route("{wellId}/report")]
        [ProducesResponseType(typeof(int), (int)System.Net.HttpStatusCode.OK)]
        public IActionResult CreateReport(int wellId, int stepSeconds, int format, 
            DateTime begin = default, DateTime end = default)
        {            
            int? idCompany = User.GetCompanyId();

            if (idCompany is null)
                return Forbid();

            if (!wellService.CheckWellOwnership((int)idCompany, wellId))
                return Forbid();

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

            return Ok(id);
        }

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

                if (idCompany is null)
                    return Forbid();

                if (!wellService.CheckWellOwnership((int)idCompany, wellId))
                    return Forbid();
                // TODO: словарь content typoв
                var relativePath = Path.Combine(reportService.RootPath, $"{wellId}", reportName);
                return PhysicalFile(Path.GetFullPath(relativePath), "application/pdf", reportName);
            }
            catch (FileNotFoundException ex)
            {
                return NotFound($"Файл не найден. Текст ошибки: {ex.Message}");
            }
        }

        /// <summary>
        /// Возвращает имена отчетов, хранящихся на диске, 
        /// которые подходят под указанные параметры
        /// </summary>
        /// <param name="wellId">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>
        /// <returns>Список имен существующих отчетов (отчетов)</returns>
        [HttpGet]
        [Route("{wellId}/suitableReports")]
        [ProducesResponseType(typeof(IEnumerable<string>), (int)System.Net.HttpStatusCode.OK)]
        public IActionResult GetSuitableReportsNames(int wellId, int stepSeconds, int format,
            DateTime begin = default, DateTime end = default)
        {
            var suitableReportsNames = reportService.GetSuitableReports(wellId, begin, end, stepSeconds, format);

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

            return Ok(suitableReportsNames);
        }

        /// <summary>
        /// Возвращает прогнозируемое количество страниц будущего отчета
        /// </summary>
        /// <param name="wellId">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>
        /// <returns>прогнозируемое кол-во страниц отчета</returns>
        [HttpGet]
        [Route("{wellId}/reportSize")]
        [ProducesResponseType(typeof(string), (int)System.Net.HttpStatusCode.OK)]
        public IActionResult GetReportSize(int wellId, int stepSeconds, int format, DateTime begin = default, DateTime end = default)
        {
            int? idCompany = User.GetCompanyId();

            if (idCompany is null)
                return Forbid();

            if (!wellService.CheckWellOwnership((int)idCompany, wellId))
                return Forbid();

            int reportSize = reportService.GetReportPagesCount(wellId, begin, end, stepSeconds, format);

            return Ok(reportSize);
        }

        /// <summary>
        /// Возвращает даты самого старого и самого свежего отчетов в БД
        /// </summary>
        /// <param name="wellId">id скважины</param>
        /// <returns>Даты самого старого и самого свежего отчетов в БД</returns>
        [HttpGet]
        [Route("{wellId}/reportsDatesRange")]
        [ProducesResponseType(typeof(DatesRangeDto), (int)System.Net.HttpStatusCode.OK)]
        public IActionResult GetReportsDateRange(int wellId)
        {
            int? idCompany = User.GetCompanyId();

            if (idCompany is null)
                return Forbid();

            if (!wellService.CheckWellOwnership((int)idCompany, wellId))
                return Forbid();

            DatesRangeDto wellReportsDatesRange = reportService.GetReportsDatesRange(wellId);

            return Ok(wellReportsDatesRange);
        }
    }
}