using HyperBooru.Services;
using HyperBooru.Util;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;

namespace HyperBooru.Controllers;

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

    private readonly string[] FormatPriority = [
        "image/webp",
        "image/png"
    ];

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

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

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

        // Check if the requested media item is a HEIC image and if it is, convert it
        // otherwise, return the original file content, unaltered
        if(media.CurrentUploadedFile!.MimeType == "image/heic") {
            // If the media needs to be converted, check the HTTP request for allowed
            // media formats, and convert to the best available format or WebP otherwise
            var allowedTypes = httpContextAccessor
                .HttpContext?
                .Request
                .GetTypedHeaders().Accept.Select(h => h.MediaType.ToString()) ?? Array.Empty<string>();

            var format = FormatPriority.FirstOrDefault(f => allowedTypes.Contains(f)) ?? "image/webp";

            var fs = mediaService.GetConverted(media, format);

            return new FileStreamResult(fs, format);
        } else {
            var fs = System.IO.File.OpenRead(mediaService.GetPath(media));
            return new FileStreamResult(fs, media.CurrentUploadedFile!.MimeType);
        }
    }

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

        try {
            var thumb = mediaService.GetThumbnail(mediaId, width, height);
            return new FileStreamResult(thumb, "image/jpeg");
        } catch(ThumbnailException e) {
            return BadRequest(e.Message);
        } catch(ObjectNotFoundException e) {
            return NotFound(e.Message);
        }
    }

    [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();

                // Parse original path from headers
                string? path =
                    formFile.Headers["X-HyperBooru-Path"]
                        .ElementAtOrDefault(0);

                object? pathType = null;
                string? pathTypeString =
                    formFile.Headers["X-HyperBooru-PathType"]
                        .ElementAtOrDefault(0);
                Enum.TryParse(typeof(PathType), pathTypeString, true, out pathType);

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

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