import json
import os

import pyheif
import rawpy
from django.shortcuts import render, get_object_or_404, reverse
from django.http.response import HttpResponse, HttpResponseRedirect
from django.views.decorators.cache import cache_page
from PIL import Image

from collection.poc import get_files
from collection.models import Picture
from collection.video import get_thumbnail_from_video


def gather_view(request):
    Picture.objects.all().delete()
    for file in get_files():
        try:
            Picture.objects.get(file_path=file.path, checksum=file.checksum)
        except Picture.DoesNotExist:
            Picture.objects.create(
                file_path=file.path,
                kind=Picture.VIDEO if file.is_video else Picture.PICTURE,
                raw=file.is_raw,
                creation_date=file.datetime,
                checksum=file.checksum,
                exif=json.dumps(file.exif),
                stat=json.dumps(file.stat),
                mimetype=file.mimetype,
            )

    for file in Picture.objects.all():
        if not os.path.exists(file.file_path):
            file.delete()

    return HttpResponse("ok")


DEFAULT_SORT_BY = "-creation_date"
SORT_BY_OPTIONS = {
    "creation_date": "Creation date ASC",
    "-creation_date": "Creation date DESC",
}


def list_view(request):
    sort_by = request.GET.get("sort_by")
    if sort_by not in SORT_BY_OPTIONS.keys():
        return HttpResponseRedirect(reverse("list") + f"?sort_by={DEFAULT_SORT_BY}")
    pictures = Picture.objects.all().order_by(DEFAULT_SORT_BY)
    years = tuple(
        Picture.objects.all()
        .distinct("creation_date__year")
        .values_list("creation_date__year", flat=True)
    )

    return render(
        template_name="list.html",
        request=request,
        context=dict(
            pictures=pictures,
            years=years,
            sort_by=sort_by,
            sort_by_options=SORT_BY_OPTIONS,
        ),
    )


def list_year_month(request, year: int, month: int = None):
    sort_by = request.GET.get("sort_by")
    pictures = Picture.objects.filter(creation_date__year=year)

    years = tuple(
        Picture.objects.all()
        .distinct("creation_date__year")
        .values_list("creation_date__year", flat=True)
    )
    months = tuple(
        pictures.distinct("creation_date__month").values_list(
            "creation_date__month", flat=True
        )
    )

    if month:
        pictures = pictures.filter(creation_date__month=month)

    return render(
        template_name="list.html",
        request=request,
        context=dict(
            pictures=pictures.order_by(DEFAULT_SORT_BY),
            years=years,
            months=months,
            selected_year=year,
            selected_month=month,
        ),
    )


def detail_view(request, picture_id):
    picture = get_object_or_404(Picture, id=picture_id)
    exif = {
        k: v
        for k, v in sorted(json.loads(picture.exif).items(), key=lambda item: item[0])
    }
    file_stat = {
        k: v
        for k, v in sorted(json.loads(picture.stat).items(), key=lambda item: item[0])
    }

    return render(
        template_name="detail.html",
        request=request,
        context=dict(picture=picture, exif=exif, file_stat=file_stat),
    )


def image_view(request, picture_id):
    picture = get_object_or_404(Picture, id=picture_id)

    return HttpResponse(open(picture.file_path, "rb").read())


def thumbnail_view(request, picture_id):
    picture = get_object_or_404(Picture, id=picture_id)

    if picture.kind == picture.VIDEO:
        thumbnail = get_thumbnail_from_video(picture.file_path, picture.checksum)
        return HttpResponse(thumbnail, content_type="image/jpg")

    if picture.raw:
        try:
            with rawpy.imread(picture.file_path) as raw:
                # raises rawpy.LibRawNoThumbnailError if thumbnail missing
                # raises rawpy.LibRawUnsupportedThumbnailError if unsupported format
                thumb = raw.extract_thumb()

            if thumb.format == rawpy.ThumbFormat.JPEG:
                # thumb.data is already in JPEG format, save as-is
                return HttpResponse(thumb.data, content_type="image/jpeg")
            elif thumb.format == rawpy.ThumbFormat.BITMAP:
                # thumb.data is an RGB numpy array, convert with imageio
                return HttpResponse(thumb.data, content_type="image/bitmap")
        except rawpy.LibRawFileUnsupportedError:
            return HttpResponse(open("photo.png", "rb"), content_type="image/png")

    if picture.mimetype == "image/heic":
        heif_file = pyheif.read_heif(picture.file_path)
        image = Image.frombytes(
            mode=heif_file.mode, size=heif_file.size, data=heif_file.data
        )
        image.thumbnail((480, 480))
        image.save(f"/tmp/thumb-480-{picture.checksum}.jpg")
        return HttpResponse(
            open(f"/tmp/thumb-480-{picture.checksum}.jpg", "rb").read(),
            content_type="image/jpg",
        )

    if picture.kind == picture.VIDEO:
        return HttpResponse(open("video.png", "rb"), content_type="image/png")

    if picture.kind == picture.PICTURE:
        image = Image.open(picture.file_path)
        image.thumbnail((480, 480))
        image.save(f"/tmp/thumb-480-{picture.checksum}.jpg")
        return HttpResponse(
            open(f"/tmp/thumb-480-{picture.checksum}.jpg", "rb").read(),
            content_type="image/jpg",
        )


video_view = image_view