using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Authorization;

using WeatherForecast.Services;
using DomainResults.Mvc;
using Core.Enumerations;
using DataProviders.Buckets;
using DomainResults.Common;
using WeatherForecast.Policies;
using DomainObjects.Documents.Users;
using WeatherForecast.Controllers.Abstractions;

namespace WeatherForecast.Controllers;

/// <summary>
/// 
/// </summary>
[Route("api/[controller]")]
public class ImageController : AuthorizationControllerBase {

  private readonly IImageBucketDataProvider _imageBucketDataProvider;
  private readonly IImageService _imageService;

  /// <summary>
  /// 
  /// </summary>
  /// <param name="authorizationService"></param>
  /// <param name="imageBucketDataProvider"></param>
  /// <param name="imgeService"></param>
  public ImageController(
    IAuthorizationService authorizationService,
    IImageBucketDataProvider imageBucketDataProvider,
    IImageService imgeService
  ) : base (authorizationService) {
    _imageBucketDataProvider = imageBucketDataProvider;
    _imageService = imgeService;
  }

  #region Post
  /// <summary>
  /// Site wide
  /// <para>
  /// Allowed: Admin, Shop Manager
  /// </para>
  /// </summary>
  /// <param name="siteId"></param>
  /// <param name="formFile"></param>
  /// <returns></returns>
  [HttpPost("{siteId}")]
  public async Task<IActionResult> Post([FromRoute] Guid siteId, IFormFile formFile) =>
    await PostCore(siteId, null, formFile);

  /// <summary>
  /// Site user specific
  /// <para>
  /// Allowed: Admin, Editor, Author, Contributor, Shop manager
  /// </para>
  /// </summary>
  /// <param name="siteId"></param>
  /// <param name="userId"></param>
  /// <param name="formFile"></param>
  /// <returns></returns>
  [HttpPost("{siteId}/{userId}")]
  public async Task<IActionResult> Post([FromRoute] Guid siteId, [FromRoute] Guid userId, IFormFile formFile) =>
    await PostCore(siteId, userId, formFile);

  private async Task<IActionResult> PostCore(Guid siteId, Guid? userId, IFormFile formFile) {
    if (!(formFile.Length > 0))
      return IDomainResult.Failed().ToActionResult();

    using var ms = new MemoryStream();
    formFile.CopyTo(ms);

    var newFile = new BucketFile(Guid.NewGuid(), siteId, formFile.FileName, ms.ToArray(), formFile.ContentType);
    if (userId != null)
      newFile.UserId = userId;

    return await AuthorizeAsync(User, new ImageAuthorisationRequirement(CrudActions.Create, new List<ImageRole> {
      new ImageRole(Roles.Admin),
      new ImageRole(Roles.Editor),
      new ImageRole(Roles.Author) { OwnOnly = true },
      new ImageRole(Roles.Contributor) { OwnOnly = true },
      new ImageRole(Roles.ShopManager)
    }), newFile, () => {
      var result = _imageService.Post(newFile);
      return result.ToActionResult();
    });
  }
  #endregion

  #region Get
  /// <summary>
  /// Site user specific
  /// <para>
  /// Allowed: Admin, Editor, Author (own), Contributor (own), Shop manager
  /// </para>
  /// <see href="https://www.c-sharpcorner.com/article/fileresult-in-asp-net-core-mvc2/">fileresult-in-asp-net-core-mvc2</see>
  /// </summary>
  /// <param name="siteId"></param>
  /// <param name="userId"></param>
  /// <param name="fileId"></param>
  /// <returns></returns>
  [HttpGet("{siteId}/{userId}/{fileId}")]
  public async Task<IActionResult> Get([FromRoute] Guid siteId, [FromRoute] Guid userId, [FromRoute] Guid fileId) {

    var (file, result) = _imageBucketDataProvider.Download(siteId, userId, fileId);
    if (!result.IsSuccess || file == null)
      return result.ToActionResult();

    return await AuthorizeAsync(User, new ImageAuthorisationRequirement(CrudActions.Read, new List<ImageRole> {
      new ImageRole(Roles.Admin),
      new ImageRole(Roles.Editor),
      new ImageRole(Roles.Author) { OwnOnly = true },
      new ImageRole(Roles.Contributor) { OwnOnly = true },
      new ImageRole(Roles.ShopManager)
    }), file, () => {
      var stream = new MemoryStream(file.Bytes);
      return new FileStreamResult(stream, file.ContentType) {
        FileDownloadName = file.Name
      };
    });
  }

  /// <summary>
  /// Site wide
  /// <para>
  /// Allowed everyone
  /// </para>
  /// </summary>
  /// <param name="siteId"></param>
  /// <param name="width"></param>
  /// <param name="height"></param>
  /// <param name="imageId"></param>
  /// <returns></returns>
  [HttpGet("{siteId}/{width}x{height}/{imageId}")]
  public IActionResult Get([FromRoute] Guid siteId, [FromRoute] int width, [FromRoute] int height, [FromRoute] Guid imageId) {

    var (file, result) = _imageService.Get(siteId, width, height, imageId);

    if (!result.IsSuccess || file == null)
      return result.ToActionResult();

    var stream = new MemoryStream(file.Bytes);
    return new FileStreamResult(stream, file.ContentType) {
      FileDownloadName = file.Name
    };
  }


  /// <summary>
  /// Site wide
  /// <para>
  /// Allowed everyone
  /// </para>
  /// </summary>
  /// <param name="siteId"></param>
  /// <param name="width"></param>
  /// <param name="height"></param>
  /// <param name="background"></param>
  /// <param name="foreground"></param>
  /// <returns></returns>
  [HttpGet("{width}x{height}/{background}/{foreground}")]
  public IActionResult Get([FromRoute] int width, [FromRoute] int height, [FromRoute] string background, [FromRoute] string foreground) {

    var (file, result) = _imageService.Get(width, height, background, foreground);

    if (!result.IsSuccess || file == null)
      return result.ToActionResult();

    var stream = new MemoryStream(file.Bytes);
    return new FileStreamResult(stream, file.ContentType) {
      FileDownloadName = file.Name
    };
  }
  #endregion

  #region Update
  /// <summary>
  /// Site specific
  /// <para>
  /// Allowed Admin, Shop Manager
  /// </para>
  /// </summary>
  /// <param name="siteId"></param>
  /// <param name="fileId"></param>
  /// <param name="formFile"></param>
  /// <returns></returns>
  [HttpPost("{siteId}/{fileId}")]
  public async Task<IActionResult> Update([FromRoute] Guid siteId, [FromRoute] Guid fileId, IFormFile formFile) =>
    await UpdateCore(siteId, null, fileId, formFile);

  /// <summary>
  /// Site user specific
  /// <para>
  /// Can Admin, Editor, Author (own), Contributor (own, not yet pubblished), Shop manager
  /// </para>
  /// </summary>
  /// <param name="siteId"></param>
  /// <param name="userId"></param>
  /// <param name="fileId"></param>
  /// <param name="formFile"></param>
  /// <returns></returns>
  [HttpPost("{siteId}/{userId}/{fileId}")]
  public async Task<IActionResult> Update([FromRoute] Guid siteId, [FromRoute] Guid userId, [FromRoute] Guid fileId, IFormFile formFile) =>
    await UpdateCore(siteId, userId, fileId, formFile);

  private async Task<IActionResult> UpdateCore(Guid siteId, Guid? userId, Guid fileId, IFormFile formFile) {

    var (file, getFileResult) = _imageBucketDataProvider.Download(siteId, userId, fileId);
    if (!getFileResult.IsSuccess || file == null)
      return getFileResult.ToActionResult();

    if (!(formFile.Length > 0))
      return IDomainResult.Failed().ToActionResult();

    using var ms = new MemoryStream();
    formFile.CopyTo(ms);

    var newFile = new BucketFile(fileId, siteId, formFile.FileName, ms.ToArray(), formFile.ContentType);
    if(userId != null)
      newFile.UserId = userId;

    return await AuthorizeAsync(User, new ImageAuthorisationRequirement(CrudActions.Update, new List<ImageRole> {
      new ImageRole(Roles.Admin),
      new ImageRole(Roles.Editor),
      new ImageRole(Roles.Author) { OwnOnly = true },
      new ImageRole(Roles.Contributor) { OwnOnly = true, DenyPublished = true },
      new ImageRole(Roles.ShopManager)
    }), file, () => {
      var result = _imageService.Update(siteId, userId, fileId, newFile);
      return result.ToActionResult();
    });
  }

  #endregion

  #region Delete
  /// <summary>
  /// Cross site media
  /// Can Admin, Shop manager
  /// </summary>
  /// <param name="siteId"></param>
  /// <param name="fileId"></param>
  /// <returns></returns>
  [HttpDelete("{siteId}/{fileId}")]
  public async Task<IActionResult> Delete([FromRoute] Guid siteId, [FromRoute] Guid fileId) =>
    await DeleteCore(siteId, null, fileId);

  /// <summary>
  /// Can Admin, Editor, Author (own), Contributor (own, not yet pubblished), Shop manager
  /// </summary>
  /// <param name="siteId"></param>
  /// <param name="userId"></param>
  /// <param name="fileId"></param>
  /// <returns></returns>
  [HttpDelete("{siteId}/{userId}/{fileId}")]
  public async Task<IActionResult> Delete([FromRoute] Guid siteId, [FromRoute] Guid userId, [FromRoute] Guid fileId) =>
    await DeleteCore(siteId, userId, fileId);

  private async Task<IActionResult> DeleteCore(Guid siteId, Guid? userId, Guid fileId) {

    var (file, fileDownloadResult) = _imageBucketDataProvider.Download(siteId, userId, fileId);
    if (!fileDownloadResult.IsSuccess || file == null)
      return fileDownloadResult.ToActionResult();

    return await AuthorizeAsync(User, new ImageAuthorisationRequirement(CrudActions.Delete, new List<ImageRole> {
      new ImageRole(Roles.Admin),
      new ImageRole(Roles.Editor),
      new ImageRole(Roles.Author) { OwnOnly = true },
      new ImageRole(Roles.Contributor) { OwnOnly = true, DenyPublished = true },
      new ImageRole(Roles.ShopManager)
    }), file, () => {
      var result = _imageService.Delete(siteId, userId, fileId);
      return result.ToActionResult();
    });
  }
  #endregion
}