using HyperBooru.Services;
using HyperBooru.Util;
using ImageMagick;
using Microsoft.AspNetCore.Mvc;
using MimeDetective;
using System.Security.Cryptography;

namespace HyperBooru.Controllers;

[ApiController]
[Route("/media")]
public class MediaController : Controller {
    private IMediaService  mediaService;
    private IConfigService config;
    private HBContext      db;

    public MediaController(
        IMediaService mediaService,
        IConfigService config,
        HBContext db) {

        this.mediaService = mediaService;
        this.config       = config;
        this.db           = db;
    }

    [HttpGet("{mediaId}")]
    public IActionResult Fetch([FromRoute] Guid mediaId) {
        var media = db.Media.First(m => m.Guid == mediaId);
        if(media is null)
            return NotFound();

        var fs = System.IO.File.OpenRead(mediaService.GetPath(media));

        return new FileStreamResult(fs, media.MimeType);
    }

    [HttpGet("thumb/{mediaId}")]
    public IActionResult Thumbnail(
        [FromRoute] Guid mediaId,
        [FromQuery] int? w,
        [FromQuery] int? h) {

        var media = db.Media.First(m => m.Guid == mediaId);
        if(media is null)
            return NotFound();

        if(media.MimeType.Split("/")[0] != "image")
            return BadRequest("Media object not an image");

        using var image = new MagickImage(mediaService.GetPath(media));

        if(w is null && h is null)
            return BadRequest("Both width and height cannot be null!");

        if(w > image.Width || h > image.Height)
            return BadRequest("Requested thumbnail size is larger than original media");

        int width =  (int)(w is not null ? w : image.Width * h / image.Height);
        int height = (int)(h is not null ? h : image.Height * w / image.Width);

        var thumbPath = mediaService.GetPath(media, width, height);

        if(!System.IO.File.Exists(thumbPath)) {
            image.Resize(new MagickGeometry(width, height));
            image.Write(thumbPath);
        }

        var fs = System.IO.File.OpenRead(thumbPath);

        return new FileStreamResult(fs, "image/jpeg");
    }

    [HttpDelete("{mediaId}")]
    public void Delete([FromRoute] Guid mediaId) {
        mediaService.Delete(mediaId);
    }

    [HttpPost]
    public IActionResult Upload() {
        if(Request.Form.Files.Count == 0)
            return BadRequest("No files");

        Media media = new();

        foreach(var formFile in Request.Form.Files) {
            try {
                // Parse timestamps from headers
                DateTime? lastAccessTime =
                    formFile.Headers["X-HyperBooru-LastAccessTime"]
                        .ElementAtOrDefault(0)?
                        .TryParseDateTimeUtc();
                DateTime? lastWriteTime =
                    formFile.Headers["X-HyperBooru-LastWriteTime"]
                        .ElementAtOrDefault(0)?
                        .TryParseDateTimeUtc();
                DateTime? createTime =
                    formFile.Headers["X-HyperBooru-CreateTime"]
                        .ElementAtOrDefault(0)?
                        .TryParseDateTimeUtc();

                media = mediaService.Create(
                    formFile.OpenReadStream(),
                    formFile.FileName,
                    formFile.Headers["X-HyperBooru-Checksum"]
                        .ElementAtOrDefault(0),
                    lastAccessTime,
                    lastWriteTime,
                    createTime);
            } catch(MediaCreateException e) {
                return BadRequest(e.Message);
            }
        }

        if(Request.Form.Files.Count == 1)
            return Redirect($"/ViewMedia?m={media.Guid}");
        else
            return Redirect($"/Gallery");
    }
}