from django.shortcuts import render, get_object_or_404, redirect, reverse
from django.contrib.auth.decorators import login_required
from django.utils.translation import gettext_lazy as _
from django.http import HttpResponseBadRequest, HttpResponseServerError
from django.core.exceptions import ObjectDoesNotExist, PermissionDenied
from django.db import IntegrityError, transaction
from django.utils import timezone
from django.core.paginator import Paginator
from django.core.files.uploadedfile import SimpleUploadedFile
from common.mastodon import mastodon_request_included
from common.mastodon.api import check_visibility, post_toot, TootVisibilityEnum
from common.mastodon.utils import rating_to_emoji
from common.utils import PageLinksGenerator
from common.views import PAGE_LINK_NUMBER
from .models import *
from .forms import *
from .forms import BookMarkStatusTranslator


# how many marks showed on the detail page
MARK_NUMBER = 5
# how many marks at the mark page
MARK_PER_PAGE = 20
# how many reviews showed on the detail page
REVIEW_NUMBER = 5
# how many reviews at the mark page
REVIEW_PER_PAGE = 20


# public data
###########################
@login_required
def create(request):
    if request.method == 'GET':
        form = BookForm()
        return render(
            request,
            'books/create_update.html',
            {
                'form': form,
                'title': _('添加书籍'),
                'submit_url': reverse("books:create")
            }
        )
    elif request.method == 'POST':
        if request.user.is_authenticated:
            # only local user can alter public data
            form = BookForm(request.POST, request.FILES)
            if form.is_valid():
                form.instance.last_editor = request.user
                form.save()
                return redirect(reverse("books:retrieve", args=[form.instance.id]))
            else:
                return render(
                    request,
                    'books/create_update.html',
                    {
                        'form': form,
                        'title': _('添加书籍'),
                        'submit_url': reverse("books:create")
                    }
                )
        else:
            return redirect(reverse("users:login"))
    else:
        return HttpResponseBadRequest()


@login_required
def update(request, id):
    if request.method == 'GET':
        book = get_object_or_404(Book, pk=id)
        form = BookForm(instance=book)
        return render(
            request,
            'books/create_update.html',
            {
                'form': form,
                'title': _('修改书籍'),
                'submit_url': reverse("books:update", args=[book.id])
            }
        )
    elif request.method == 'POST':
        book = get_object_or_404(Book, pk=id)
        form = BookForm(request.POST, request.FILES, instance=book)
        if form.is_valid():
            form.instance.last_editor = request.user
            form.instance.edited_time = timezone.now()
            form.save()
        else:
            return render(
            request,
            'books/create_update.html',
            {
                'form': form,
                'title': _('修改书籍'),
                'submit_url': reverse("books:update", args=[book.id])
            }
        )
        return redirect(reverse("books:retrieve", args=[form.instance.id]))

    else:
        return HttpResponseBadRequest()    


@mastodon_request_included
@login_required
def retrieve(request, id):
    if request.method == 'GET':
        book = get_object_or_404(Book, pk=id)
        mark = None
        review = None
        try:
            mark = BookMark.objects.get(owner=request.user, book=book)
        except ObjectDoesNotExist:
            mark = None
        if mark:
            mark.get_status_display = BookMarkStatusTranslator(mark.status)
            mark_form = BookMarkForm(instance=mark)
        else:
            mark_form = BookMarkForm(initial={
                'book': book
            })

        try:
            review = BookReview.objects.get(owner=request.user, book=book)
        except ObjectDoesNotExist:
            review = None
        
        mark_list = BookMark.get_available(book, request.user, request.session['oauth_token'])
        mark_list_more = True if len(mark_list) > MARK_NUMBER else False
        mark_list = mark_list[:MARK_NUMBER]
        for m in mark_list:
            m.get_status_display = BookMarkStatusTranslator(m.status)
        review_list = BookReview.get_available(book, request.user, request.session['oauth_token'])
        review_list_more = True if len(review_list) > REVIEW_NUMBER else False
        review_list = review_list[:REVIEW_NUMBER]

        # def strip_html_tags(text):
        #     import re
        #     regex = re.compile('<.*?>')
        #     return re.sub(regex, '', text)

        # for r in review_list:
        #     r.content = strip_html_tags(r.content)

        return render(
            request,
            'books/detail.html',
            {
                'book': book,
                'mark': mark,
                'review': review,
                'status_enum': MarkStatusEnum,
                'mark_form': mark_form,
                'mark_list': mark_list,
                'mark_list_more': mark_list_more,
                'review_list': review_list,
                'review_list_more': review_list_more,
            }
        )
    else:
        return HttpResponseBadRequest()


@login_required
def delete(request, id):
    if request.method == 'GET':
        book = get_object_or_404(Book, pk=id)
        return render(
            request,
            'books/delete.html',
            {
                'book': book,
            }
        )
    elif request.method == 'POST':
        if request.user.is_staff:
            # only staff has right to delete
            book = get_object_or_404(Book, pk=id)
            book.delete()
            return redirect(reverse("common:search"))
        else:
            raise PermissionDenied()
    else:
        return HttpResponseBadRequest()    


# user owned entites
###########################
@mastodon_request_included
@login_required
def create_update_mark(request):
    # check list:
    # clean rating if is wish
    # transaction on updating book rating
    # owner check(guarantee)
    if request.method == 'POST':
        pk = request.POST.get('id')
        old_rating = None
        if pk:
            mark = get_object_or_404(BookMark, pk=pk)
            old_rating = mark.rating
            # update
            form = BookMarkForm(request.POST, instance=mark)
        else:
            # create
            form = BookMarkForm(request.POST)

        if form.is_valid():
            if form.instance.status == MarkStatusEnum.WISH.value:
                form.instance.rating = None
                form.cleaned_data['rating'] = None
            form.instance.owner = request.user
            form.instance.edited_time = timezone.now()
            book = form.instance.book
            try:
                with transaction.atomic():
                    # update book rating
                    book.update_rating(old_rating, form.instance.rating)
                    form.save()
            except IntegrityError as e:
                return HttpResponseServerError()

            if form.cleaned_data['share_to_mastodon']:
                if form.cleaned_data['is_private']:
                    visibility = TootVisibilityEnum.PRIVATE
                else:
                    visibility = TootVisibilityEnum.UNLISTED
                url = "https://" + request.get_host() + reverse("books:retrieve", args=[book.id])
                words = BookMarkStatusTranslator(int(form.cleaned_data['status'])) +\
                     f"《{book.title}》" + rating_to_emoji(form.cleaned_data['rating'])
                content = words + '\n' + url + '\n' + form.cleaned_data['text']
                post_toot(content, visibility, request.session['oauth_token'])
        else:
            return HttpResponseBadRequest()

        return redirect(reverse("books:retrieve", args=[form.instance.book.id]))
    else:
        return HttpResponseBadRequest()


@mastodon_request_included
@login_required
def retrieve_mark_list(request, book_id):
    if request.method == 'GET':
        book = get_object_or_404(Book, pk=book_id)
        queryset = BookMark.get_available(book, request.user, request.session['oauth_token'])
        paginator = Paginator(queryset, MARK_PER_PAGE)
        page_number = request.GET.get('page', default=1)
        marks = paginator.get_page(page_number)
        marks.pagination = PageLinksGenerator(PAGE_LINK_NUMBER, page_number, paginator.num_pages)
        for m in marks:
            m.get_status_display = BookMarkStatusTranslator(m.status)
        return render(
            request,
            'books/mark_list.html',
            {
                'marks': marks,
                'book': book,
            }
        )
    else:
        return HttpResponseBadRequest()


@login_required
def delete_mark(request, id):
    if request.method == 'POST':
        mark = get_object_or_404(BookMark, pk=id)
        book_id = mark.book.id
        try:
            with transaction.atomic():
                # update book rating
                mark.book.update_rating(mark.rating, None)
                mark.delete()
        except IntegrityError as e:
            return HttpResponseServerError()
        return redirect(reverse("books:retrieve", args=[book_id]))
    else:
        return HttpResponseBadRequest()


@mastodon_request_included
@login_required
def create_review(request, book_id):
    if request.method == 'GET':
        form = BookReviewForm(initial={'book': book_id})
        book = get_object_or_404(Book, pk=book_id)
        return render(
            request,
            'books/create_update_review.html',
            {
                'form': form,
                'title': _("添加评论"),
                'book': book,
                'submit_url': reverse("books:create_review", args=[book_id]),
            }
        )
    elif request.method == 'POST':
        form = BookReviewForm(request.POST)
        if form.is_valid():
            form.instance.owner = request.user
            form.save()
            if form.cleaned_data['share_to_mastodon']:
                if form.cleaned_data['is_private']:
                    visibility = TootVisibilityEnum.PRIVATE
                else:
                    visibility = TootVisibilityEnum.UNLISTED
                url = "https://" + request.get_host() + reverse("books:retrieve_review", args=[form.instance.id])
                words = "发布了关于" + f"《{form.instance.book.title}》" + "的评论"
                content = words + '\n' + url + '\n' + form.cleaned_data['title']
                post_toot(content, visibility, request.session['oauth_token'])
            return redirect(reverse("books:retrieve_review", args=[form.instance.id]))
        else:
            return HttpResponseBadRequest()
    else:
        return HttpResponseBadRequest()


@mastodon_request_included
@login_required
def update_review(request, id):
    # owner check
    # edited time
    if request.method == 'GET':
        review = get_object_or_404(BookReview, pk=id)
        if request.user != review.owner:
            return HttpResponseBadRequest()        
        form = BookReviewForm(instance=review)
        book = review.book
        return render(
            request,
            'books/create_update_review.html',
            {
                'form': form,
                'title': _("编辑评论"),
                'book': book,
                'submit_url': reverse("books:update_review", args=[review.id]),
            }
        )
    elif request.method == 'POST':
        review = get_object_or_404(BookReview, pk=id)
        if request.user != review.owner:
            return HttpResponseBadRequest()
        form = BookReviewForm(request.POST, instance=review)
        if form.is_valid():
            form.instance.edited_time = timezone.now()
            form.save()
            if form.cleaned_data['share_to_mastodon']:
                if form.cleaned_data['is_private']:
                    visibility = TootVisibilityEnum.PRIVATE
                else:
                    visibility = TootVisibilityEnum.UNLISTED
                url = "https://" + request.get_host() + reverse("books:retrieve_review", args=[form.instance.id])
                words = "发布了关于" + f"《{form.instance.book.title}》" + "的评论"
                content = words + '\n' + url + '\n' + form.cleaned_data['title']
                post_toot(content, visibility, request.session['oauth_token'])
            return redirect(reverse("books:retrieve_review", args=[form.instance.id]))
        else:
            return HttpResponseBadRequest()
    else:
        return HttpResponseBadRequest()    


@login_required
def delete_review(request, id):
    if request.method == 'GET':
        review = get_object_or_404(BookReview, pk=id)
        if request.user != review.owner:
            return HttpResponseBadRequest()
        review_form = BookReviewForm(instance=review)
        return render(
            request,
            'books/delete_review.html',
            {
                'form': review_form,
                'review': review,
            }
        )
    elif request.method == 'POST':
        review = get_object_or_404(BookReview, pk=id)
        if request.user != review.owner:
            return HttpResponseBadRequest()
        book_id = review.book.id
        review.delete()
        return redirect(reverse("books:retrieve", args=[book_id]))
    else:
        return HttpResponseBadRequest()


@mastodon_request_included
@login_required
def retrieve_review(request, id):
    if request.method == 'GET':
        review = get_object_or_404(BookReview, pk=id)
        if not check_visibility(review, request.session['oauth_token'], request.user):
            msg = _("你没有访问这个页面的权限😥")
            return render(
                request,
                'common/error.html',
                {
                    'msg': msg,
                }
            )
        review_form = BookReviewForm(instance=review)
        book = review.book
        try:
            mark = BookMark.objects.get(owner=review.owner, book=book)
            mark.get_status_display = BookMarkStatusTranslator(mark.status)
        except ObjectDoesNotExist:
            mark = None
        return render(
            request,
            'books/review_detail.html',
            {
                'form': review_form,
                'review': review,
                'book': book,
                'mark': mark,
            }
        )
    else:
        return HttpResponseBadRequest()


@mastodon_request_included
@login_required
def retrieve_review_list(request, book_id):
    if request.method == 'GET':
        book = get_object_or_404(Book, pk=book_id)
        queryset = BookReview.get_available(book, request.user, request.session['oauth_token'])
        paginator = Paginator(queryset, REVIEW_PER_PAGE)
        page_number = request.GET.get('page', default=1)
        reviews = paginator.get_page(page_number)
        reviews.pagination = PageLinksGenerator(PAGE_LINK_NUMBER, page_number, paginator.num_pages)
        return render(
            request,
            'books/review_list.html',
            {
                'reviews': reviews,
                'book': book,
            }
        )
    else:
        return HttpResponseBadRequest()


@login_required
def scrape(request):
    if request.method == 'GET':
        keywords = request.GET.get('q')
        form = BookForm()
        return render(
            request,
            'books/scrape.html',
            {
                'q': keywords,
                'form': form,
            }
        )
    else:
        return HttpResponseBadRequest()


@login_required
def click_to_scrape(request):
    if request.method == "POST":
        url = request.POST.get("url")
        if url:
            from common.scraper import scrape_douban_book
            try:
                scraped_book, raw_cover = scrape_douban_book(url)
            except TimeoutError:
                return render(request, 'common/error.html', {'msg': _("爬取数据失败😫，请重试")})
            except ValueError:
                return render(request, 'common/error.html', {'msg': _("链接非法，爬取失败")})
            scraped_cover = {'cover': SimpleUploadedFile('temp.jpg', raw_cover)}
            form = BookForm(scraped_book, scraped_cover)
            if form.is_valid():
                form.instance.last_editor = request.user
                form.save()
                return redirect(reverse('books:retrieve', args=[form.instance.id]))
            else:
                if 'isbn' in form.errors:
                    msg = _("ISBN与现有图书重复")
                else:
                    msg = _("爬取数据失败😫")
                return render(request, 'common/error.html', {'msg': msg})
        else:
            return HttpResponseBadRequest()
    else:
        return HttpResponseBadRequest()