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import json
import os
from django.conf import settings
from django.core.urlresolvers import reverse
from django.http.response import HttpResponse, HttpResponseBadRequest, HttpResponseRedirect, Http404, \
    HttpResponseForbidden
from django.shortcuts import render, get_object_or_404
from django.contrib.auth.decorators import login_required
from django.views.decorators.http import require_POST
from PIL import Image
from adim.models import AnObj
from .forms import UploadImageFileForm
from sendfile import sendfile

def home(request):
    """
    Home page
    :param request:
    :return:
    """
    context = {}
    if request.user.is_anonymous():
        context['next'] = request.GET.get('next', "")
    return render(request, "adim_app/home.html", context)


def handle_404(request):
    if request.user.is_authenticated():
        return HttpResponseRedirect(reverse("adim.app:annotate-new"))
    else:
        return HttpResponseRedirect(reverse('adim.app:home'))


@login_required()
def essai(request):
    """
    Page d'essais
    :param request:
    :return:
    """
    return render(request, "adim_app/essai.html", {})
    # return render(request, "adim_app/essai.html", {})


@login_required
def _get_anobj(request, anobj_uuid=None, anobj_id=None):
    """
    Returns an AnObj with the uuid or id passed in parameters if
    the request.user has sufficient permissions for it
    Raise a 404 if it cannot return the AnObj

    :param request:
    :param anobj_uuid:
    :return: AnObj
    :raise: Http404
    """
    q = {}
    if anobj_uuid is not None:
        q['uuid'] = anobj_uuid
    elif anobj_id is not None:
        q['id'] = anobj_id
    if not q:
        raise Http404()
    anobj = get_object_or_404(AnObj, **q)
    if request.user != anobj.owner:
        raise Http404()
    return anobj


@login_required
def send_anobj_img(request, anobj_uuid):
    try:
        anobj = _get_anobj(request, anobj_uuid=anobj_uuid)
        return sendfile(request, anobj.image.path)
    except Http404:
        return HttpResponseForbidden('Sorry, you cannot access this file')


@login_required
def send_anobj_thumb(request, anobj_uuid):
    try:
        anobj = _get_anobj(request, anobj_uuid=anobj_uuid)
        thumb_path = os.path.join(
            settings.MEDIA_ROOT,
            os.path.splitext(anobj.image.name)[0] + '__.png'
        )
        return sendfile(request, thumb_path)
    except Http404:
        return HttpResponseForbidden('Sorry, you cannot access this file')


@login_required
def annotate_new(request):
    return render(request, "adim_app/annotation_new.html", {})


@login_required
def annotate(request, anobj_uuid=None):
    """
    Annotation page
    :param request:
    :param anobj_uuid:
    :return:
    """
    context = {}

    anobj = _get_anobj(request, anobj_uuid=anobj_uuid)
    context.update({
        'anobj': anobj
    })
    return render(request, "adim_app/annotation.html", context)


@login_required
def upload_file(request, anobj_uuid=None):
    """

    -- inspired by: https://github.com/miki725/Django-jQuery-File-Uploader-Integration-demo/blob/master/upload/views.py
    :param request:
    :return:
    """
    if request.method != 'POST':
        return HttpResponseBadRequest()

    response_type = "application/json"
    response_data = {}

    form = UploadImageFileForm(request.POST, request.FILES)
    if form.is_valid():
        image_file = request.FILES['image_file']
        file_response = _validate_uploaded_file(image_file)
        response_data.update({
            'error': file_response.get('error'),
            'files': [file_response],
        })

        # Create AnObj
        if not file_response['error']:
            try:
                anobj = _get_anobj(request, anobj_uuid=anobj_uuid)
                anobj.image = image_file
                anobj.save()
            except Http404:
                anobj = AnObj.objects.create(
                    owner=request.user,
                    name=os.path.splitext(image_file.name)[0],
                    image=image_file
                )
            response_data['next'] = reverse('adim.app:annotate', kwargs={'anobj_uuid': anobj.uuid})

        # Needed when using iFrame transport
        if "text/html" in request.META["HTTP_ACCEPT"]:
            response_type = "text/html"
    else:
        response_data['error'] = "invalid"

    if request.is_ajax():
        return HttpResponse(json.dumps(response_data), content_type=response_type)
    else:
        return HttpResponseRedirect(response_data['next'])
    

def _validate_uploaded_file(image_file):
    options = {
        # the maximum file size (must be in bytes)
        "maxfilesize": settings.ADIM_UPLOAD_MAX_FILESIZE * 2 ** 20,  # 2 Mb
        # the file types which are going to be allowed for upload
        # must be a mimetype
        "acceptedformats": (
            "image/jpeg",
            "image/jpg",
            "image/png",
        )
    }

    error_id = False
    if image_file.size > options["maxfilesize"]:
        error_id = "maxFileSize"
    # allowed file type
    if image_file.content_type not in options["acceptedformats"]:
        error_id = "acceptFileTypes"

    response_data = {
        "name": image_file.name,
        "size": image_file.size,
        "type": image_file.content_type,
        "error": error_id,
    }

    return response_data


@login_required
@require_POST
def upload_thumb(request):
    anobj_id = None
    try:
        anobj_id = int(request.POST.get('aid'))
    except TypeError:
        return HttpResponseBadRequest()

    # anobj = AnObj.objects.get(pk=anobj_id)
    anobj = _get_anobj(request, anobj_id=anobj_id)
    thumb_name = os.path.splitext(anobj.image.name)[0] + '__.png'
    thumb_path = os.path.join(settings.MEDIA_ROOT, thumb_name)
    # thumb_url = os.path.join(settings.MEDIA_URL, thumb_name)
    thumb_url = reverse('adim.app:ao_thumb', kwargs={'anobj_uuid': anobj.uuid})

    thumb_file = request.FILES['file']
    response_data = _validate_uploaded_file(thumb_file)
    if response_data['error']:
        return HttpResponseBadRequest()

    with open(thumb_path, 'wb+') as destination:
        for chunk in thumb_file.chunks():
            destination.write(chunk)

    add_borders(thumb_path)

    if anobj.thumb_url != thumb_url:
        anobj.thumb_url = thumb_url
        anobj.save()

    return HttpResponse(anobj.thumb_url, content_type="text/plain")


def add_borders(thumb_path):
    brd_w = 1

    thumb_image = Image.open(thumb_path)
    overlay_image = Image.new(thumb_image.mode, thumb_image.size, color=(0, 0, 0))
    result_image = Image.blend(thumb_image, overlay_image, alpha=0.33)
    result_image.paste(
        thumb_image.crop(
            (brd_w, brd_w) + tuple(a - brd_w for a in thumb_image.size)
        ),
        box=(brd_w, brd_w)
    )
    result_image.save(thumb_path)


def _handle_uploaded_file(image_file, destination):
    destination_path = os.path.join(settings.MEDIA_ROOT, destination, image_file.name)
    with open(destination_path, 'wb+') as destination:
        for chunk in image_file.chunks():
            destination.write(chunk)