using AsbCloudApp.Services;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using System.ComponentModel.DataAnnotations;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using AsbCloudApp.Data;
using AsbCloudApp.Repositories;
using Microsoft.AspNetCore.Authorization;

namespace AsbCloudWebApi.Controllers;

/// <summary>
/// Справки по страницам
/// </summary>
[Route("api/[controller]")]
[ApiController]
[Authorize]
public class HelpPageController : ControllerBase
{
    private readonly IHelpPageService helpPageService;
    private readonly IUserRepository userRepository;

    public HelpPageController(IHelpPageService helpPageService,
        IUserRepository userRepository)
    {
        this.helpPageService = helpPageService;
        this.userRepository = userRepository;
    }

    /// <summary>
    /// Создание файла справки
    /// </summary>
    /// <param name="urlPage">Url страницы для которой предназначена эта справка</param>
    /// <param name="idCategory">Id катагории файла</param>
    /// <param name="file">Загружаемый файл</param>
    /// <returns>Id созданной справки</returns>
    [HttpPost]
    [Permission]
    [Route("saveFile")]
    [ProducesResponseType(typeof(int), (int)System.Net.HttpStatusCode.OK)]
    public async Task<IActionResult> CreateAsync(string urlPage, 
        int idCategory,
        [Required] IFormFile file)
    {
        int? idUser = User.GetUserId();
        
        if(!idUser.HasValue)
            return Forbid();
        
        if (!userRepository.HasPermission(idUser.Value, $"HelpPage.create"))
            return Forbid();
        
        var helpPage = await helpPageService.GetOrDefaultByUrlPageAndIdCategoryAsync(urlPage,
            idCategory,
            CancellationToken.None);

        using var fileStream = file.OpenReadStream();

        if (helpPage is not null)
        {
            await helpPageService.UpdateAsync(helpPage,
                idCategory,
                file.FileName,
                fileStream,
                CancellationToken.None);
        
            return Ok(helpPage.Id);
        }

        int helpPageId = await helpPageService.CreateAsync(urlPage,
            idCategory,
            file.FileName,
            fileStream,
            CancellationToken.None);

        return Ok(helpPageId);
    }

    /// <summary>
    /// Получение файла справки
    /// </summary>
    /// <param name="id">Id справки</param>
    /// <returns>Файл</returns>
    [HttpGet]
    [Route("getById/{id}")]
    [ProducesResponseType(typeof(PhysicalFileResult), (int)System.Net.HttpStatusCode.OK)]
    public async Task<IActionResult> GetFileAsync(int id)
    {
        var helpPage = await helpPageService.GetOrDefaultByIdAsync(id,
            CancellationToken.None);

        if (helpPage is null)
            return NotFound();

        using var fileStream = helpPageService.GetFileStream(helpPage);
        
        var memoryStream = new MemoryStream();
        await fileStream.CopyToAsync(memoryStream, 
            CancellationToken.None);
        memoryStream.Position = 0;
        
        return File(memoryStream, "application/octet-stream", helpPage.Name);
    }

    /// <summary>
    /// Получение информации о справке
    /// </summary>
    /// <param name="urlPage">Url страницы</param>
    /// <param name="idCategory">Id категории</param>
    /// <returns>Dto справки</returns>
    [HttpGet]
    [Route("getByUrlPage/{urlPage}/{idCategory}")]
    [ProducesResponseType(typeof(HelpPageDto), (int)System.Net.HttpStatusCode.OK)]
    public async Task<IActionResult> GetByUrlPageAsync(string urlPage,
        int idCategory)
    {
        var helpPage = await helpPageService.GetOrDefaultByUrlPageAndIdCategoryAsync(urlPage,
            idCategory,
            CancellationToken.None);

        return Ok(helpPage);
    }
}