from __future__ import absolute_import
from typing import Optional, Any, Dict
from collections import OrderedDict
from django.views.generic import TemplateView
from django.conf import settings
from django.http import HttpRequest, HttpResponse, HttpResponseNotFound

import os
import ujson

from zerver.lib import bugdown
from zerver.lib.integrations import INTEGRATIONS, HUBOT_LOZENGES
from zerver.lib.utils import get_subdomain
from zproject.jinja2 import render_to_response

def add_api_uri_context(context, request):
    # type: (Dict[str, Any], HttpRequest) -> None
    if settings.REALMS_HAVE_SUBDOMAINS:
        subdomain = get_subdomain(request)
        if subdomain:
            display_subdomain = subdomain
            html_settings_links = True
        else:
            display_subdomain = 'yourZulipDomain'
            html_settings_links = False
        external_api_path_subdomain = '%s.%s' % (display_subdomain,
                                                 settings.EXTERNAL_API_PATH)
    else:
        external_api_path_subdomain = settings.EXTERNAL_API_PATH
        html_settings_links = True

    external_api_uri_subdomain = '%s%s' % (settings.EXTERNAL_URI_SCHEME,
                                           external_api_path_subdomain)

    context['external_api_path_subdomain'] = external_api_path_subdomain
    context['external_api_uri_subdomain'] = external_api_uri_subdomain
    context["html_settings_links"] = html_settings_links

class ApiURLView(TemplateView):
    def get_context_data(self, **kwargs):
        # type: (**Any) -> Dict[str, str]
        context = super(ApiURLView, self).get_context_data(**kwargs)
        add_api_uri_context(context, self.request)
        return context

class APIView(ApiURLView):
    template_name = 'zerver/api.html'


class HelpView(ApiURLView):
    template_name = 'zerver/help/main.html'
    path_template = os.path.join(settings.DEPLOY_ROOT, 'templates/zerver/help/%s.md')

    def get_path(self, article):
        # type: (str) -> str
        if article == "":
            article = "index"
        return self.path_template % (article,)

    def get_context_data(self, **kwargs):
        # type: (**Any) -> Dict[str, Any]
        article = kwargs["article"]
        context = super(HelpView, self).get_context_data()  # type: Dict[str, Any]
        path = self.get_path(article)
        if os.path.exists(path):
            context["article"] = path
        else:
            context["article"] = self.get_path("missing")
        # For disabling the "Back to home" on the homepage
        context["not_index_page"] = not path.endswith("/index.md")
        return context

    def get(self, request, article=""):
        # type: (HttpRequest, str) -> HttpResponse
        path = self.get_path(article)
        result = super(HelpView, self).get(self, article=article)
        if not os.path.exists(path):
            # Ensure a 404 response code if no such document
            result.status_code = 404
        return result


class IntegrationView(ApiURLView):
    template_name = 'zerver/integrations.html'

    def get_context_data(self, **kwargs):
        # type: (**Any) -> Dict[str, Any]
        context = super(IntegrationView, self).get_context_data(**kwargs)  # type: Dict[str, Any]
        alphabetical_sorted_integration = OrderedDict(sorted(INTEGRATIONS.items()))
        alphabetical_sorted_hubot_lozenges = OrderedDict(sorted(HUBOT_LOZENGES.items()))
        context['integrations_dict'] = alphabetical_sorted_integration
        context['hubot_lozenges_dict'] = alphabetical_sorted_hubot_lozenges

        if context["html_settings_links"]:
            settings_html = '<a href="../#settings">Zulip settings page</a>'
            subscriptions_html = '<a target="_blank" href="../#subscriptions">subscriptions page</a>'
        else:
            settings_html = 'Zulip settings page'
            subscriptions_html = 'subscriptions page'

        context['settings_html'] = settings_html
        context['subscriptions_html'] = subscriptions_html

        return context


def api_endpoint_docs(request):
    # type: (HttpRequest) -> HttpResponse
    context = {} # type: Dict[str, Any]
    add_api_uri_context(context, request)

    raw_calls = open('templates/zerver/api_content.json', 'r').read()
    calls = ujson.loads(raw_calls)
    langs = set()
    for call in calls:
        call["endpoint"] = "%s/v1/%s" % (context["external_api_uri_subdomain"],
                                         call["endpoint"])
        call["example_request"]["curl"] = call["example_request"]["curl"].replace("https://api.zulip.com",
                                                                                  context["external_api_uri_subdomain"])
        response = call['example_response']
        if '\n' not in response:
            # For 1-line responses, pretty-print them
            extended_response = response.replace(", ", ",\n ")
        else:
            extended_response = response
        call['rendered_response'] = bugdown.convert("~~~ .py\n" + extended_response + "\n~~~\n")
        for example_type in ('request', 'response'):
            for lang in call.get('example_' + example_type, []):
                langs.add(lang)
    return render_to_response(
        'zerver/api_endpoints.html', {
            'content': calls,
            'langs': langs,
        },
        request=request)