# -*- coding: utf-8 -*- 
from django.shortcuts import render
from .models import Post
from django.db.models import Count, Max, Min, Q
from django.utils import timezone
from django.shortcuts import render, get_object_or_404, render_to_response
from django.shortcuts import redirect
from .forms import PostForm
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger
from django.contrib.auth.decorators import login_required
from taggit.models import Tag
import math


def cloud():
    min_font = 11
    max_font = 28
    #size = max(min_font, round((min_font+(tag_list[i]-min_w)*step)*(math.log(tag_list[i])/Math.log(max_w))))
    v = Tag.objects.all().annotate(c = Count('post')).filter(c__gt = 0).aggregate(Min('c'), Max('c'))
    max_tag, min_tag = v["c__max"], v["c__min"]
    step = (max_font - min_font)/float(max_tag-min_tag)
    #print step
    """
    tags = Tag.objects.all().annotate(
                             c = Count('post'), f=min_font + (Count('post')-min_tag)*step).filter(
                             c__gt = 0).order_by('name')
    """
    tags = Tag.objects.all().annotate(c = Count('post')).order_by('name').filter(c__gt = 0)
    return tags


def post_list(request, page='1', tag=None):
    if tag is None:
        post_list = Post.objects.filter(published_date__lte=timezone.now()).order_by('-published_date')#[int(page)*5-5:int(page)*5]
    else:
        post_list = Post.objects.filter(tags__name=tag).order_by('-published_date')
    search_query = ''
    if request.GET.get('search'):
        search_query = request.GET.get('search')
        post_list = Post.objects.filter(Q(title__contains = request.GET.get('search')) | Q(text__contains = request.GET.get('search'))).order_by('-published_date')
    paginator = Paginator(post_list, 5)
    page = request.GET.get('page')
    latest = Post.objects.filter(published_date__lte=timezone.now()).order_by('-published_date')[0:9]
    #cloud = cloud() local variable 'cloud' referenced before assignment
    tag_cloud = cloud()
    try:
        posts = paginator.page(page)
    except PageNotAnInteger: # If page is not an integer, deliver first page.
        posts = paginator.page(1)
    except EmptyPage: # If page is out of range (e.g. 9999), deliver last page of results.
        posts = paginator.page(paginator.num_pages)
    #print dir(posts.paginator)
    return render_to_response('blog/post_list.html', {'posts': posts, 'latest': latest, 'cloud': tag_cloud, 'search_query': search_query})


def post_detail(request, pk):
    post = get_object_or_404(Post, pk=pk)
    tags = post.tags.names()
    tag_cloud = cloud()
    latest = Post.objects.filter(published_date__lte=timezone.now()).order_by('-published_date')[0:9]
    if request.POST.get('action') == 'delete':
        if request.user.is_authenticated():
            post.delete()
            return redirect('/')
        else:
            return redirect('/admin/login/?next=/post/' + pk)
    return render(request, 'blog/post_detail.html', {'post': post, 'tags': tags, 'latest': latest, 'cloud': tag_cloud})


@login_required(login_url="/admin/login/?next=/")    
def post_new(request):
        tag_cloud = cloud()
        latest = Post.objects.filter(published_date__lte=timezone.now()).order_by('-published_date')[0:9]
        if request.method == "POST":
            form = PostForm(request.POST)
            if form.is_valid():
                post = form.save(commit=False)
                post.author = request.user
                post.published_date = timezone.now()
                post.save()
                form.save_m2m()
                return redirect('blog.views.post_detail', pk=post.pk)
        else:
            form = PostForm()
        return render(request, 'blog/post_edit.html', {'form': form, 'latest': latest, 'cloud': tag_cloud})


@login_required(login_url="/admin/login/?next=/")    
def post_edit(request, pk):
        tag_cloud = cloud()
        latest = Post.objects.filter(published_date__lte=timezone.now()).order_by('-published_date')[0:9]
        post = get_object_or_404(Post, pk=pk)
        if request.method == "POST":
            form = PostForm(request.POST, instance = post)
            if form.is_valid():
                post = form.save(commit=False)
                post.author = request.user
               #post.published_date = timezone.now()
                post.save()
                form.save_m2m()
                return redirect('blog.views.post_detail', pk=post.pk)
        else:
            form = PostForm(instance=post)
        return render(request, 'blog/post_edit.html', {'form': form, 'latest': latest, 'cloud': tag_cloud})