using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http.HttpResults;
using Microsoft.AspNetCore.Mvc;
using Mizuki.Dtos;
using Mizuki.Services;
using Mizuki.Validators;

namespace Mizuki.Controllers;

/// <summary>
/// The file api 
/// </summary>
/// <param name="uploadService"></param>
[Authorize]
[Route("/api/file")]
public class FileController(
    UploadService uploadService,
    LoginService loginService,
    FormFileValidator formFileValidator)
{
    /// <summary>
    /// Creates a new file.
    /// </summary>
    /// <param name="formFile">The given file.</param>
    /// <returns>Either the result, or an error.</returns>
    [HttpPost]
    [Route("upload")]
    public async Task<Results<Ok<FileCreationResultDto>, BadRequest<FileCreationErrorDto>>> UploadFile(
        IFormFile formFile)
    {
        var result = await formFileValidator.ValidateAsync(formFile);
        if (!result.IsValid)
        {
            if (result.Errors.Any(e => e.PropertyName == "Length"))
                return TypedResults.BadRequest(new FileCreationErrorDto("The file is too big. (Max is 50MiB)"));
           
            if (result.Errors.Any(e => e.PropertyName == "Filename"))
                return TypedResults.BadRequest(new FileCreationErrorDto("Invalid filename."));

            return TypedResults.BadRequest(new FileCreationErrorDto("Unknown validation error."));
        }

        var user = await loginService.GetActiveUser();
        var upload = await uploadService.CreateUpload(user, formFile);
        if (upload is null)
        {
            return TypedResults.BadRequest(new FileCreationErrorDto("There was a problem processing your upload, please try again later."));
        }

        return TypedResults.Ok(new FileCreationResultDto(upload.Filename));
    }
    
    /// <summary>
    /// Lists all of the files for the logged in user.
    /// </summary>
    /// <returns>The list of all files this user has.</returns>
    [HttpGet]
    [Route("all")]
    public async Task<IEnumerable<FileDto>> ListAllFiles()
    {
        var user = await loginService.GetActiveUser();
        var uploads = await uploadService.GetAllUploadsForUser(user);

        return uploads.Select(u => new FileDto(
            u.Filename,
            u.OriginalFilename,
            u.SizeInBytes));
    }

    /// <summary>
    /// Deletes a file.
    /// </summary>
    /// <param name="filename">The filename of the file.</param>
    [HttpGet]
    [Route("delete")]
    public async Task DeleteFile(
        [FromQuery] string filename)
    {
        var user = await loginService.GetActiveUser();
        await uploadService.DeleteUpload(user, filename);
    }
}