from django.shortcuts import render,get_object_or_404
from .models import Post,Comment
from django.core.paginator import Paginator,EmptyPage,PageNotAnInteger
from django.views.generic import ListView
from .forms import EmailPostForm,CommentForm,SearchForm
from django.core.mail import send_mail
from taggit.models import Tag
from django.db.models import Count
from haystack.query import SearchQuerySet

# Create your views here.
#search
def post_search(request):
    form = SearchForm()
    cd=None
    results=None
    total_results=0
    if 'query' in request.GET:
        form = SearchForm(request.GET)
        if form.is_valid():
            cd = form.cleaned_data
            results = SearchQuerySet().models(Post).filter(content=cd['query']).load_all()
            # count total results
            total_results = results.count()
    return render(request, 'myblog/post/search.html', {'form': form,
                                                     'cd': cd,
                                                     'results': results,
                                                     'total_results': total_results})
class PostListView(ListView):
    queryset=Post.published.all()
    context_object_name = 'posts'
    paginate_by = 3
    template_name = 'myblog/post/list.html'
def post_list(request,tag_slug=None):
    object_list = Post.published.all()
    tag = None

    if tag_slug:
        tag = get_object_or_404(Tag, slug=tag_slug)
        object_list = object_list.filter(tags__in=[tag])

    paginator = Paginator(object_list, 3) # 3 posts in each page
    page = request.GET.get('page')
    try:
        posts = paginator.page(page)
    except PageNotAnInteger:
        # If page is not an integer deliver the first page
        posts = paginator.page(1)
    except EmptyPage:
        # If page is out of range deliver last page of results
        posts = paginator.page(paginator.num_pages)
    return render(request, 'myblog/post/list.html', {'page': page,
                                                   'posts': posts,
                                                   'tag': tag})
def post_detail(request,year,month,day,post):
    post=get_object_or_404(Post,slug=post,\
                           status='published',
                           publish__year=year,
                           publish__month=month,
                           publish__day=day)
    comments=post.comments.filter(active=True)
    if request.method=='POST':
        comment_form=CommentForm(data=request.POST)
        if comment_form.is_valid():
            new_comment=comment_form.save(commit=False)
            new_comment.post=post
            new_comment.save()
    else:
        comment_form=CommentForm()
    post_tags_ids=post.tags.values_list('id',flat=True)
    similar_posts=Post.published.filter(tags__in=post_tags_ids).exclude(id=post.id)
    similar_posts=similar_posts.annotate(same_tags=Count('tags')).order_by('-same_tags','-publish')[:4]
    return render(request,'myblog/post/detail.html',
                  {'post':post,
                   'comments':comments,
                   'comment_form':comment_form,
                   'similar_posts':similar_posts})

#share
def post_share(request,post_id):
    post=get_object_or_404(Post,id=post_id,status='published')
    sent=False

    if request.method=='POST':
        form=EmailPostForm(request.POST)
        if form.is_valid():
            cd=form.cleaned_data
            post_url=request.build_absolute_uri(post.get_absolute_url())
            subject='{} ({}) recommends you reading "{}"'.format(
                cd['name'],cd['email'],post.title
            )
            message='Read "{}" at {}\n\n{}\'s comments: {}'.format(
                post.title,post_url,cd['name'],cd['comments']
            )
            send_mail(subject,message,'18663994033@163.com',[cd['to']])
            sent=True
    else:
        form=EmailPostForm()
    return render(request,'myblog/post/share.html',{'post':post,'form':form,'sent':sent})