using Microsoft.AspNetCore.Http.HttpResults;
using Microsoft.AspNetCore.Mvc;
using Mizuki.Services;

namespace Mizuki.Controllers;

/// <summary>
/// The controller serving the uploaded files.
/// </summary>
[ApiController]
[Route("/f")]
public class ServeController(
    DriveService driveService,
    UploadService uploadService) : ControllerBase
{
    /// <summary>
    /// Tries to get the file by its filename.
    /// </summary>
    /// <param name="filename">The filename.</param>
    /// <returns>The file, or an error.</returns>
    [Route("{filename}")]
    [HttpGet]
    public async Task<Results<FileStreamHttpResult, NotFound>> GetFile(
        [FromRoute] string filename)
    {
        var file = await uploadService.GetByFilename(filename);
        if (file is null)
            return TypedResults.NotFound();

        var stream = driveService.OpenFileByFilename(filename);
        if (stream is null)
            return TypedResults.NotFound();
        
        return TypedResults.File(
            stream,
            fileDownloadName: file.OriginalFilename);
    }
}