import json
import os

from django.http import HttpResponse, Http404, FileResponse, HttpResponseRedirect
from django.template import loader, RequestContext
from django.contrib.auth.decorators import login_required
from .models import *
from django.conf import settings
from GeneralApp.funcs import get_inter_http_respose
from django.utils.translation import gettext_lazy as _
from django.urls import reverse
from collections import OrderedDict
from django.template.loader import render_to_string
from urllib.parse import unquote

def get_tree_arts(art, arts, sel_arts_ids):

    docs_tree = OrderedDict()

    docs_tree.update({
        art_item.id: {
            'url': art_item.url,
            'name': art_item.name,
            # 'id': art_item.id,
            'children': get_tree_arts(art_item, arts, sel_arts_ids),
            'active': art_item.id in sel_arts_ids
        } for art_item in arts.filter(parent=art)
    })
    return docs_tree





def _response_pdf(path):

    filePDF = open(path, 'rb')

    content = filePDF.read()
    # content = str(content)
    filePDF.close()

    response = HttpResponse(content, content_type='application/pdf')
    response['Content-Disposition'] = 'filename="{fn}"'.format(fn=os.path.basename(path))
    return response


def pdf_render(request, template, context, file_name):
    from BaseModels.functions import url_translit
    from GeneralApp.funcs_options import get_options_by_opt_types

    filename = url_translit(file_name)

    html = render_to_string(template, context, request)

    sets = get_options_by_opt_types(['domain'], only_vals=True, w_prefix=True)
    if settings.DEBUG:
        sets['domain'] = 'http://127.0.0.1:8019'
    while 'src="/' in html:
        html = html.replace('src="/', f'src="{sets["domain"]}/')
    # html = unquote(html)


    f = open(f'{settings.PDF_FOLDER}/{filename}.html', 'w')
    f.write(html)
    f.close()

    os.system(
        '{wkhtmltopdf} '
        # '--margin-top 20mm '
        # '--encoding windows-1250 '
        '--enable-local-file-access '
        '--load-error-handling ignore '
        '--enable-internal-links '
        '--keep-relative-links '
        '--print-media-type '
        '--encoding UTF-8 '
        # '--default-header '
        # '--minimum-font-size 20mm '
        '{pdf_folder}/{file_name}.html '
        '{pdf_folder}/{file_name}.pdf'.format(
            wkhtmltopdf=settings.WKHTML_TO_PDF, pdf_folder=settings.PDF_FOLDER, file_name=filename)
    )
    path = settings.PDF_FOLDER + '/' + filename + '.pdf'
    # os.system(u'{wkhtmltopdf} {print_folder}/order{filename}.html {print_folder}/order{filename}.pdf'.format(wkhtmltopdf=settings.WKHTML_TO_PDF, print_folder=settings.PRINT_FOLDER))
    return _response_pdf(path)



def DocsView(request, version=None, art_url=None):



    if art_url and version:

        generate_pdf = False
        if request.GET and 'pdf' in request.GET and request.GET['pdf'] == 'true':
            generate_pdf = True

        kwargs = {
            'enable': True,
            'url': art_url,
            'versions__url': version,
        }
        try:
            art = DocArt.objects.get(**kwargs)

            try:
                vers_obj = DocVersion.objects.get(enable=True, url=version)
            except DocVersion.DoesNotExist:
                raise Http404

            active_arts, active_arts_ids = art.get_parents_path()
            arts = DocArt.objects.filter(enable=True, versions=vers_obj).order_by('order')
            doc_tree = get_tree_arts(None, arts, active_arts_ids)

            versions = DocVersion.objects.exclude(
                rel_docArts_for_version=None
            ).filter(
                enable=True,
            ).order_by('order', 'name')

            breadcrumbs = OrderedDict({
                'Документация и техническая поддержка': reverse('docs_main'),
                f'Документация для версии {version}': reverse(
                    'docs_version_page', kwargs={'version': version}),
            })
            breadcrumbs.update({
                item.name: reverse(
                    'docs_art_page', kwargs={'version': version, 'art_url': item.url}
                ) for item in active_arts
            })


            Dict = {
                'cur_article': art,
                'cur_version': vers_obj,
                'doc_tree': doc_tree,
                'allow_versions': versions,
                'breadcrumbs': breadcrumbs,
                'prev_article': art.get_prev_article(version=vers_obj),
                'next_article': art.get_next_article(version=vers_obj),
                'pdf_render': generate_pdf
            }

            if not generate_pdf:
                tpl = 'pages/p_documentation.html'
                t = loader.get_template(tpl)
                return get_inter_http_respose(t, Dict, request)
            else:
                tpl = 'blocks/b_documentation_article.html'
                # tpl = 'pages/p_documentation.html'
                return pdf_render(request, tpl, Dict, art.name)

        except DocArt.DoesNotExist:
            raise Http404



    if version:
        try:
            vers_obj = DocVersion.objects.get(enable=True, url=version)
            if vers_obj:
                art = vers_obj.get_article()
                if art:
                    url = reverse(
                        'docs_art_page',
                        kwargs={'version': version, 'art_url': art.url}
                    )
                    return HttpResponseRedirect(url)
        except DocVersion.DoesNotExist:
            raise Http404

    art = DocArt.objects.exclude(
        versions=None
    ).filter(
        enable=True, parent=None
    ).order_by('-versions__order', '-versions__name', 'order').first()
    if art:
        url = reverse(
            'docs_art_page',
            kwargs={'version': art.versions.order_by('-order').first().url, 'art_url': art.url}
        )
        return HttpResponseRedirect(url)


    if not art:
        raise Http404