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

namespace AsbCloudWebApi.Controllers
{
    [Route("api/well/{idWell}/files")]
    [ApiController]
    [Authorize]
    public class FileController : ControllerBase
    {
        private readonly IFileService fileService;
        private readonly IWellService wellService;

        public FileController(IFileService fileService, IWellService wellService)
        {
            this.fileService = fileService;
            this.wellService = wellService;
        }

        /// <summary>
        /// Сохраняет переданные файлы и информацию о них
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="idCategory">id категории файла</param>
        /// <param name="files">Коллекция файлов</param>
        /// <param name="token"> Токен отмены задачи </param>
        /// <returns></returns>
        [HttpPost]
        [ProducesResponseType(typeof(int), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> SaveFilesAsync(int idWell, int idCategory,
            [FromForm] IFormFileCollection files, CancellationToken token = default)
        {
            int? idCompany = User.GetCompanyId();
            int? idUser = User.GetUserId();

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

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

            var fileInfoCollection = files.Select(f => new FileInfoDto
            { 
                Name = f.FileName, 
                IdCategory = idCategory, 
                UploadDate = DateTime.Now
            });

            var fileNamesAndIds = fileService.SaveFileInfos(idWell, (int)idUser,
                fileInfoCollection);


            foreach (var file in files)
            {
                var fileExtension = Path.GetExtension(file.FileName);

                var fileId = fileNamesAndIds[file.FileName];

                var fileStream = file.OpenReadStream();

                await fileService.SaveFile(idWell, idCategory, fileId,
                    fileExtension, fileStream);
            }

            return Ok();
        }

        /// <summary>
        /// Возвращает информацию о файлах для скважины в выбраной категории
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="idCategory">id категории файла</param>
        /// <param name="companies">id компаний для фильтрации возвращаемых файлов</param>
        /// <param name="begin">дата начала</param>
        /// <param name="end">дата окончания</param>
        /// <param name="skip">для пагинации кол-во записей пропустить</param>
        /// <param name="take">для пагинации кол-во записей взять </param>
        /// <param name="token"> Токен отмены задачи </param>
        /// <returns>Список информации о файлах в этой категории</returns>
        [HttpGet]
        [ProducesResponseType(typeof(PaginationContainer<FileInfoDto>), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> GetFilesInfoAsync([FromRoute] int idWell,
            int skip = 0, int take = 32, int idCategory = default,
            IEnumerable<int> companies = default, DateTime begin = default, 
            DateTime end = default, CancellationToken token = default)
        {
            int? idCompany = User.GetCompanyId();

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

            var filesInfo = await fileService.GetFilesInfoAsync(idWell, idCategory,
                companies, begin, end, skip, take, token).ConfigureAwait(false);

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

            return Ok(filesInfo);
        }

        /// <summary>
        /// Возвращает файл с диска на сервере
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="fileId">id запрашиваемого файла</param>
        /// <param name="token"> Токен отмены задачи </param>
        /// <returns>Запрашиваемый файл</returns>
        [HttpGet]
        [Route("{fileId}")]
        [ProducesResponseType(typeof(PhysicalFileResult), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> GetFileAsync([FromRoute] int idWell,
            int fileId, 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();

                var fileInfo = await fileService.GetFileInfoAsync(fileId, token);

                if (fileInfo is null)
                    throw new FileNotFoundException();

                // TODO: словарь content typoв
                var relativePath = Path.Combine(fileService.RootPath, $"{idWell}", $"{fileInfo.IdCategory}",
                    $"{fileInfo.Id}" + Path.GetExtension($"{fileInfo.Name}"));
                return PhysicalFile(Path.GetFullPath(relativePath), "application/octet-stream", fileInfo.Name);
            }
            catch (FileNotFoundException ex)
            {
                return NotFound($"Файл не найден. Текст ошибки: {ex.Message}");
            }
        }

        /// <summary>
        /// Удаляет файл с диска на сервере
        /// </summary>
        /// <param name="idWell">id скважины</param>
        /// <param name="idFile">id запрашиваемого файла</param>
        /// <param name="token"> Токен отмены задачи </param>
        /// <returns></returns>
        [HttpDelete("{idFile}")]
        [ProducesResponseType(typeof(int), (int)System.Net.HttpStatusCode.OK)]
        public async Task<IActionResult> DeleteAsync(int idWell, int idFile,
            CancellationToken token = default)
        {
            int? idCompany = User.GetCompanyId();

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

            var result = await fileService.DeleteFileAsync(idFile, token);

            return Ok(result);
        }
    }
}