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# coding=utf-8
from __future__ import unicode_literals

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import json
import os
from django.conf import settings
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from django.core.exceptions import PermissionDenied
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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
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from django.views.decorators.cache import cache_control
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from PIL import Image
from adim.models import AnObj
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from adim.models.annotables import AnObjMembership
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from adim.permissions import check_anobj_permission, get_permission_class, has_anobj_access, SHARING_MODE_NONE

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from .forms import UploadImageFileForm
from sendfile import sendfile
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from .utils import add_image_border, create_image_thumbnail

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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():
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        return HttpResponseRedirect(reverse("adim_app:annotate-new"))
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    else:
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        return HttpResponseRedirect(reverse('adim_app:home'))
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@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
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    :raise: PermissionDenied
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    """
    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)
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    if not has_anobj_access(request, anobj):
        raise PermissionDenied()

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    return anobj


@login_required
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@cache_control(public=True, max_age=120)
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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')


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@login_required
def anobj_thumb(request, anobj_uuid):
    if request.method == 'GET':
        return send_anobj_thumb(request, anobj_uuid=anobj_uuid)
    elif request.method == 'POST':
        return upload_anobj_thumb(request, anobj_uuid=anobj_uuid)


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@login_required
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@cache_control(public=True, max_age=1)
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def send_anobj_thumb(request, anobj_uuid):
    try:
        anobj = _get_anobj(request, anobj_uuid=anobj_uuid)
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        thumb_name = "{name}__{user}.png".format(name=os.path.splitext(anobj.image.name)[0], user=request.user.id)
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        thumb_path = os.path.join(
            settings.MEDIA_ROOT,
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            thumb_name
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        )
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        # If there is not yet a thumbnail for the current user
        # return the original one
        if not os.path.isfile(thumb_path):
            thumb_name = "{name}__.png".format(name=os.path.splitext(anobj.image.name)[0])
            thumb_path = os.path.join(
                settings.MEDIA_ROOT,
                thumb_name
            )
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        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 = {}

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    anobj = get_object_or_404(AnObj, uuid__startswith=anobj_uuid)

    # In case of fragmentary uuid, redirect to the url with full uuid
    if len(anobj_uuid) < 32:
        return HttpResponseRedirect(reverse('adim_app:annotate', kwargs={'anobj_uuid': anobj.uuid}))
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    # Detailed check for permissions
    if request.user != anobj.owner:
        # User is guest
        perm_class = get_permission_class(anobj.sharing_mode)

        if perm_class is None:
            # AnObj not shared
            raise Http404()
            # raise PermissionDenied()

        elif not perm_class.has_permission(request, anobj):
            # AnObj shared but user has no permission
            if perm_class.has_interactive_registration:
                # Interactive registration exists, call it
                return perm_class.get_interactive_registration_response(request, anobj)

            # No interactive registration
            raise PermissionDenied()

        else:
            # AnObj shared, user registred, go on
            pass

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        context['membership'] = AnObjMembership.objects.get(anobj=anobj, user=request.user)

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    if request.method == 'POST':
        return HttpResponseRedirect(reverse('adim_app:annotate', kwargs={'anobj_uuid': anobj_uuid}))

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    context.update({
        'anobj': anobj
    })
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    # Determine if we may display shared annotations
    context.update({'display_shared_annotations':
        (anobj.sharing_mode != SHARING_MODE_NONE) and
        (
            (request.user == anobj.owner) or
            anobj.allow_public_publishing
        )
    })

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    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()
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            except Http404:
                anobj = AnObj.objects.create(
                    owner=request.user,
                    name=os.path.splitext(image_file.name)[0],
                    image=image_file
                )
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            # Create original thumbnail, returned to user who has not yet annotated
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            create_image_thumbnail(anobj.image.path)
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            response_data['next'] = reverse('adim_app:annotate', kwargs={'anobj_uuid': anobj.uuid})
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        # 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
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def upload_anobj_thumb(request, anobj_uuid=None):
    if anobj_uuid:
        anobj = _get_anobj(request, anobj_uuid=anobj_uuid)
    else:
        try:
            anobj_id = int(request.POST.get('aid'))
            anobj = _get_anobj(request, anobj_id=anobj_id)
        except TypeError:
            return HttpResponseBadRequest()
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    thumb_name = "{name}__{user}.png".format(name=os.path.splitext(anobj.image.name)[0], user=request.user.id)
    # thumb_name = "{name}__.png".format(name=os.path.splitext(anobj.image.name)[0])
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    thumb_path = os.path.join(settings.MEDIA_ROOT, thumb_name)
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    # thumb_url = reverse('adim.app:ao_thumb', kwargs={'anobj_uuid': anobj.uuid})
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    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)

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    add_image_border(thumb_path, save=True)
    # add_borders(thumb_path)

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

    return HttpResponse()
    # 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 add_borders2(img, save=False):
#     if type(img) == str or type(img) == unicode:
#         try:
#             thumb_image = Image.open(img)
#             thumb_path = img
#         except IOError:
#             # TODO: log some error
#             return
#     elif Image.isImageType(img):
#         thumb_image = img
#         thumb_path = img.filename
#     else:
#         raise TypeError()
#
#     brd_w = 1
#
#     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)
#     )
#     if save:
#         result_image.save(thumb_path)
#     return result_image
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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)