from django.template import RequestContext
from boards import forms
import boards
from boards.forms import ThreadForm, PostForm, SettingsForm
from boards.models import Post, Admin, Tag
from django.shortcuts import render, get_list_or_404, redirect
from django.http import HttpResponseRedirect, Http404
import neboard


def index(request):
    context = RequestContext(request)

    if request.method == 'POST':
        return new_post(request)
    else:
        threads = Post.objects.get_threads()

        context['threads'] = None if len(threads) == 0 else threads
        context['form'] = forms.ThreadForm()
        context['tags'] = Tag.objects.get_not_empty_tags()
        context['theme'] = _get_theme(request)

        return render(request, 'posting_general.html',
                      context)


def new_post(request, thread_id=boards.models.NO_PARENT):
    """Add a new post (in thread or as a reply)."""

    if thread_id == boards.models.NO_PARENT:
        form = ThreadForm(request.POST, request.FILES)
    else:
        form = PostForm(request.POST, request.FILES)

    if form.is_valid():
        data = form.cleaned_data
    else:
        return redirect(index)

    title = data['title']
    text = data['text']

    if 'image' in data.keys():
        image = data['image']
    else:
        image = None

    ip = request.META['REMOTE_ADDR']

    tags = []
    if thread_id == boards.models.NO_PARENT:
        tag_strings = data['tags']

        if tag_strings:
            tag_strings = tag_strings.split(' ')
            for tag_name in tag_strings:
                tag_name = tag_name.strip()
                if len(tag_name) > 0:
                    tag, created = Tag.objects.get_or_create(name=tag_name)
                    tags.append(tag)

    # TODO Add a possibility to define a link image instead of an image file.
    # If a link is given, download the image automatically.

    post = Post.objects.create_post(title=title, text=text, ip=ip,
                                    parent_id=thread_id, image=image,
                                    tags=tags)

    thread_to_show = (post.id if thread_id == boards.models.NO_PARENT else
                      thread_id)
    return redirect(thread, post_id=thread_to_show)


def tag(request, tag_name):
    """Get all tag threads (posts without a parent)."""

    tag = Tag.objects.get(name=tag_name)
    threads = Post.objects.get_threads(tag=tag)

    if request.method == 'POST':
        return new_post(request)
    else:
        context = RequestContext(request)
        context['threads'] = None if len(threads) == 0 else threads
        context['tag'] = tag_name
        context['tags'] = Tag.objects.get_not_empty_tags()
        context['theme'] = _get_theme(request)

        context['form'] = forms.ThreadForm(initial={'tags': tag_name})

        return render(request, 'posting_general.html',
                      context)


def thread(request, post_id):
    """Get all thread posts"""

    if request.method == 'POST':
        return new_post(request, post_id)
    else:
        # TODO Show 404 if there is no such thread
        posts = Post.objects.get_thread(post_id)

        context = RequestContext(request)

        context['posts'] = posts
        context['form'] = forms.PostForm()
        context['tags'] = Tag.objects.get_not_empty_tags()
        context['theme'] = _get_theme(request)

        return render(request, 'thread.html', context)


def login(request):
    """Log in as admin"""

    if 'name' in request.POST and 'password' in request.POST:
        request.session['admin'] = False

        isAdmin = len(Admin.objects.filter(name=request.POST['name'],
                                           password=request.POST[
                                               'password'])) > 0

        if isAdmin:
            request.session['admin'] = True

            response = HttpResponseRedirect('/')

        else:
            response = render(request, 'login.html', {'error': 'Login error'})
    else:
        response = render(request, 'login.html', {})

    return response


def logout(request):
    request.session['admin'] = False
    return HttpResponseRedirect('/')


def settings(request):
    context = RequestContext(request)

    if request.method == 'POST':
        form = SettingsForm(request.POST)
        if form.is_valid():
            selected_theme = form.cleaned_data['theme']
            request.session['theme'] = selected_theme

        return redirect(settings)
    else:
        selected_theme = _get_theme(request)
        form = SettingsForm(initial={'theme': selected_theme})
        context['form'] = form
        context['tags'] = Tag.objects.get_not_empty_tags()
        context['theme'] = _get_theme(request)

        return render(request, 'settings.html', context)


def _get_theme(request):
    return request.session.get('theme', neboard.settings.DEFAULT_THEME)