from django.shortcuts import render
from django.http import HttpResponseRedirect
from django.urls import reverse

from .models import Topic
from .forms import TopicForm, EntryForm

# Create your views here.
def index(request):
"""学习笔记的主页"""
return render(request, 'learning_logs/index.html')

def topics(request):
"""显示所有的主题"""
topics = Topic.objects.order_by('date_added')
context = {'topics':topics}
return render(request, 'learning_logs/topics.html', context)

def topic(request,topic_id):
"""显示单个主题及其所有的条目"""
topic = Topic.objects.get(id = topic_id)
entries = topic.entry_set.order_by('-date_added')
context = {'topic': topic, 'entries': entries}
return render(request, 'learning_logs/topic.html', context)

def new_topic(request):
"""添加新主题"""
if request.method != 'POST':
#未提交数据：创建新表单
form = TopicForm()
else:
#POST提交的数据，对数据进行处理
form = TopicForm(request.POST)
if form.is_valid():
form.save()
return HttpResponseRedirect(reverse('learning_logs:topics'))

context = {'form':form}
return render(request, 'learning_logs/new_topic.html', context)

def new_entry(request, topic_id):
"""在特定的主题中添加新条目"""
topic = Topic.objects.get(id=topic_id)

if request.method != 'POST':
#未提交数据，创建一个空表单
form = EntryForm()
else:
#POST提交的数据，对数据进行处理
form = EntryForm(data=request.POST)
if form.is_valid():
new_entry = form.save(commit=False)
new_entry.topic = topic
new_entry.save()
return HttpResponseRedirect(reverse('learning_logs:topic', args=[topic_id]))

context = {'topic': topic, 'form': form}
return render(request, 'learning_logs/new_entry.html', context)

topics.html