# Create your views here.
from django.core.exceptions import ValidationError
from django.http import HttpResponseRedirect
from django.shortcuts import get_object_or_404
from django.utils.decorators import method_decorator
from django.views.decorators.csrf import csrf_protect
from django.views.generic.edit import FormView

from accounts.models import BlogUser
from blog.models import Article
from .forms import CommentForm
from .models import Comment

# 评论提交处理视图
class CommentPostView(FormView):
    form_class = CommentForm# 指定使用的表单类
    template_name = 'blog/article_detail.html'# 表单无效时渲染的模板

    #为视图添加CSRF保护
    @method_decorator(csrf_protect)
    def dispatch(self, *args, **kwargs):
        return super(CommentPostView, self).dispatch(*args, **kwargs)

    # 处理GET请求：直接访问评论提交URL时重定向到文章详情页评论区
    def get(self, request, *args, **kwargs):
        article_id = self.kwargs['article_id']
        article = get_object_or_404(Article, pk=article_id)
        url = article.get_absolute_url()
        return HttpResponseRedirect(url + "#comments")

    # 表单验证失败时的处理：重新渲染文章详情页并显示表单错误
    def form_invalid(self, form):
        article_id = self.kwargs['article_id']
        article = get_object_or_404(Article, pk=article_id)

        return self.render_to_response({
            'form': form,
            'article': article
        })

    # 表单验证成功后的处理：保存评论并发送通知邮件
    def form_valid(self, form):
        """提交的数据验证合法后的逻辑"""
        user = self.request.user# 获取当前登录用户
        author = BlogUser.objects.get(pk=user.pk)# 获取完整的用户信息
        article_id = self.kwargs['article_id']
        article = get_object_or_404(Article, pk=article_id)

        # 检查文章是否允许评论（评论状态或文章状态为关闭时抛出异常）
        if article.comment_status == 'c' or article.status == 'c':
            raise ValidationError("该文章评论已关闭.")
        # 创建评论实例但不保存到数据库
        comment = form.save(False)
        comment.article = article
        # 获取站点配置，判断评论是否需要审核
        from djangoblog.utils import get_blog_setting
        settings = get_blog_setting()
        if not settings.comment_need_review:
            comment.is_enable = True# 无需审核则直接启用评论
        comment.author = author# 设置评论作者

        # 处理父评论ID：如果存在则设置为回复评论
        if form.cleaned_data['parent_comment_id']:
            parent_comment = Comment.objects.get(
                pk=form.cleaned_data['parent_comment_id'])
            comment.parent_comment = parent_comment
        # 保存评论到数据库
        comment.save(True)
        # 重定向到文章详情页并定位到该评论锚点位置
        return HttpResponseRedirect(
            "%s#div-comment-%d" %
            (article.get_absolute_url(), comment.pk))