from datetime import datetime

from flask import session

from main import db

class Favorite(db.Model):
    __tablename__ = 'favorite'
    favoriteid = db.Column(db.Integer, primary_key=True)
    userid = db.Column(db.String(64), db.ForeignKey('user.userid'))
    articleid = db.Column(db.String(64), db.ForeignKey('article.articleid'))
    canceled = db.Column(db.Integer, nullable=False)
    # canceled 默认是0，不取消收藏
    createtime = db.Column(db.DateTime, nullable=False)  # 使用 DateTime 类型，并设置默认值为当前 UTC 时间
    updatetime = db.Column(db.DateTime, nullable=False)


    # 插入收藏数据
    # 每次收藏之前，先看一下之前是否收藏过，没有才插入，有的话直接更改cancled
    @classmethod
    def insert_favorite(cls,articleid):
        userid = session.get('userid')
        if Favorite.is_favorite(articleid): # 如果收藏存在
            cls.query.filter_by(userid = userid, articleid = articleid).update({cls.canceled:0})
        else:
            favorite = Favorite(userid = userid,articleid = articleid,canceled = 0,createtime=datetime.utcnow(),updatetime=datetime.utcnow())
            db.session.add(favorite)
        try:
            db.session.commit()
        except Exception as e:
            print("收藏失败，文章id:", articleid, "错误:", e)
        return True

    # 取消收藏
    @classmethod
    def cancel_favorite(cls,articleid):
        # 默认是已经收藏过的文章
        userid = session.get('userid')
        cls.query.filter_by(userid=userid, articleid=articleid).update({cls.canceled: 1})
        db.session.commit()
        return True


    # 判断是否收藏过
    @classmethod
    def is_favorite(cls,articleid):
        userid = session.get('userid')
        result = cls.query.filter_by(articleid=articleid, userid=userid).first()
        if result is None: # 如果结果不存在
            return False
        else:
            return True

    # 判断是否正在收藏
    @classmethod
    def is_at_favorite(cls,articleid):
        userid = session.get('userid')
        result = cls.query.filter_by(articleid=articleid, userid=userid,canceled = 0).first()
        if result is None: # 如果结果不存在
            return False
        else:
            return True