import os
import random
import markdown2

from django.contrib.auth.decorators import login_required
from django.db import IntegrityError
from django.http import HttpResponse
from django.shortcuts import render, redirect
from blog.factories import TopicFactory
from blog.models import Topic, Tag, Blogpost
from django.views.decorators.csrf import csrf_exempt

from markdownblog import settings


def viewblog(request, title) -> HttpResponse:
    post = Blogpost.objects.get(title=title)
    filepath = os.path.join(os.environ.get("MD_FILE_PATH"), title + ".md")
    with open(filepath, 'r') as mdfile:
        md_file_content = mdfile.read()
        mdfile.close()

    html = markdown2.markdown(md_file_content, extras=['footnotes', 'task_list', 'strike', 'break-on-newline', 'tables',
                                                       'fenced-code-blocks'])

    context = {'post': post, 'html': html}
    return render(request, 'blog/viewpost.html', context)


def index(request) -> HttpResponse:
    return render(request, 'blog/index.html', {"debug": settings.DEBUG})


@login_required
@csrf_exempt
def order(request) -> HttpResponse:
    if request.method == "POST":
        root_id = int(request.POST['rootID']) if request.POST['rootID'] != 'root_list' else None
        child_id = int(request.POST['childID'])
        objtype = request.POST['relinkType']

        if objtype == 'topic':
            child_topic = Topic.objects.get(pk=child_id)
            child_topic.rootTopic = Topic.objects.get(pk=root_id) if root_id is not None else None
            child_topic.save()
        elif objtype == 'post':
            post = Blogpost.objects.get(pk=child_id)
            post.topic = Topic.objects.get(pk=root_id) if root_id is not None else None
            post.save()

    context = {'roottopics': Topic.objects.all().filter(rootTopic=None), 'allposts': Blogpost.objects.all()}
    return render(request, 'blog/order.html', context)


@login_required
def addpost(request) -> HttpResponse:
    context = {'alltopics': Topic.objects.all().order_by('name').values(), 'markdown': ''}
    if request.method == 'POST':
        title = request.POST['title']
        markdown = request.POST['markdown']

        tags = []

        if 'tags' in request.POST and request.POST['tags'] != '':
            tags_str = request.POST['tags'].split(" ")
            for tag in tags_str:
                tags.append(Tag.objects.get_or_create(name=tag))

        topicid = request.POST['topic']
        topic = None if topicid == "No topic" else Topic.objects.get(pk=topicid)

        try:
            new_post = Blogpost.objects.create(title=title, topic=topic)
            new_post.tags.set(tags)
        except IntegrityError:
            context = {'alltopics': Topic.objects.all().order_by('name').values(),
                       'error': 'Blogpost titles need to be unique. No post created.',
                       "markdown": markdown}
            return render(request, 'blog/addpost.html', context)

        filepath = os.path.join(os.environ.get("MD_FILE_PATH"), title + ".md")
        with open(filepath, "w+") as mdfile:
            mdfile.write(markdown)
            mdfile.close()
        context['error'] = "Post \"" + title + "\" created."

    return render(request, 'blog/addpost.html', context)


@login_required
def createmocks(request, objtype, n) -> HttpResponse:
    topics = TopicFactory.create_batch(n)

    for topic in topics:
        topic.save()

    while len(topics) > 1:
        child = random.choice(topics)
        topics.remove(child)
        child.rootTopic = random.choice(topics)
        child.save()

    print('Created ' + str(n) + ' mock topics.')
    return redirect("index")