from datetime import datetime
from flask_sqlalchemy import SQLAlchemy
from flask_login import UserMixin
from werkzeug.security import generate_password_hash, check_password_hash

db = SQLAlchemy()

# 网站和标签的多对多关系表
site_tags = db.Table('site_tags',
    db.Column('site_id', db.Integer, db.ForeignKey('sites.id'), primary_key=True),
    db.Column('tag_id', db.Integer, db.ForeignKey('tags.id'), primary_key=True)
)

class Site(db.Model):
    """网站模型"""
    __tablename__ = 'sites'

    id = db.Column(db.Integer, primary_key=True)
    code = db.Column(db.String(8), unique=True, nullable=False, comment='8位数字编码')
    name = db.Column(db.String(100), nullable=False, comment='网站名称')
    url = db.Column(db.String(500), nullable=False, comment='网站URL')
    slug = db.Column(db.String(100), unique=True, nullable=True, comment='URL别名(SEO用)')
    logo = db.Column(db.String(500), comment='Logo图片路径')
    short_desc = db.Column(db.String(200), comment='简短描述')
    description = db.Column(db.Text, comment='详细介绍')
    features = db.Column(db.Text, comment='主要功能')
    news_keywords = db.Column(db.String(200), comment='新闻获取关键词（用于精准匹配相关新闻）')
    is_active = db.Column(db.Boolean, default=True, comment='是否启用')
    view_count = db.Column(db.Integer, default=0, comment='浏览次数')
    sort_order = db.Column(db.Integer, default=0, comment='排序权重')
    created_at = db.Column(db.DateTime, default=datetime.now, comment='创建时间')
    updated_at = db.Column(db.DateTime, default=datetime.now, onupdate=datetime.now, comment='更新时间')

    # 关联标签
    tags = db.relationship('Tag', secondary=site_tags, lazy='subquery',
                          backref=db.backref('sites', lazy=True))

    def __repr__(self):
        return f'<Site {self.name}>'

    def to_dict(self):
        """转换为字典"""
        return {
            'id': self.id,
            'code': self.code,
            'name': self.name,
            'url': self.url,
            'slug': self.slug,
            'logo': self.logo,
            'short_desc': self.short_desc,
            'description': self.description,
            'features': self.features,
            'news_keywords': self.news_keywords,
            'is_active': self.is_active,
            'view_count': self.view_count,
            'tags': [tag.name for tag in self.tags],
            'created_at': self.created_at.strftime('%Y-%m-%d %H:%M:%S') if self.created_at else None
        }

class Tag(db.Model):
    """标签模型"""
    __tablename__ = 'tags'

    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(50), unique=True, nullable=False, comment='标签名称')
    slug = db.Column(db.String(50), unique=True, nullable=False, comment='URL别名')
    description = db.Column(db.String(200), comment='标签描述')
    seo_title = db.Column(db.String(100), comment='SEO标题(v2.4新增)')
    seo_description = db.Column(db.String(300), comment='SEO页面描述(v2.4新增)')
    seo_keywords = db.Column(db.String(200), comment='SEO关键词(v2.4新增)')
    icon = db.Column(db.String(100), comment='图标')
    sort_order = db.Column(db.Integer, default=0, comment='排序权重')
    created_at = db.Column(db.DateTime, default=datetime.now, comment='创建时间')

    def __repr__(self):
        return f'<Tag {self.name}>'

    def to_dict(self):
        """转换为字典"""
        return {
            'id': self.id,
            'name': self.name,
            'slug': self.slug,
            'description': self.description,
            'seo_title': self.seo_title,
            'seo_description': self.seo_description,
            'seo_keywords': self.seo_keywords,
            'icon': self.icon
        }

class News(db.Model):
    """新闻模型"""
    __tablename__ = 'news'

    id = db.Column(db.Integer, primary_key=True)
    site_id = db.Column(db.Integer, db.ForeignKey('sites.id'), nullable=False, comment='关联网站ID')
    title = db.Column(db.String(200), nullable=False, comment='新闻标题')
    content = db.Column(db.Text, comment='新闻内容')
    news_type = db.Column(db.String(50), default='Industry News', comment='新闻类型')
    url = db.Column(db.String(500), comment='新闻链接')
    source_name = db.Column(db.String(100), comment='新闻来源网站名称')
    source_icon = db.Column(db.String(500), comment='新闻来源网站图标URL')
    published_at = db.Column(db.DateTime, default=datetime.now, comment='发布时间')
    is_active = db.Column(db.Boolean, default=True, comment='是否启用')
    created_at = db.Column(db.DateTime, default=datetime.now, comment='创建时间')
    updated_at = db.Column(db.DateTime, default=datetime.now, onupdate=datetime.now, comment='更新时间')

    # 关联网站
    site = db.relationship('Site', backref=db.backref('news', lazy='dynamic', order_by='News.published_at.desc()'))

    def __repr__(self):
        return f'<News {self.title}>'

    def to_dict(self):
        """转换为字典"""
        return {
            'id': self.id,
            'site_id': self.site_id,
            'title': self.title,
            'content': self.content,
            'news_type': self.news_type,
            'url': self.url,
            'source_name': self.source_name,
            'source_icon': self.source_icon,
            'published_at': self.published_at.strftime('%Y-%m-%d') if self.published_at else None,
            'created_at': self.created_at.strftime('%Y-%m-%d %H:%M:%S') if self.created_at else None
        }

class Admin(UserMixin, db.Model):
    """管理员模型"""
    __tablename__ = 'admins'

    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(50), unique=True, nullable=False, comment='用户名')
    password_hash = db.Column(db.String(255), nullable=False, comment='密码哈希')
    email = db.Column(db.String(100), comment='邮箱')
    is_active = db.Column(db.Boolean, default=True, comment='是否启用')
    created_at = db.Column(db.DateTime, default=datetime.now, comment='创建时间')
    last_login = db.Column(db.DateTime, comment='最后登录时间')

    def set_password(self, password):
        """设置密码"""
        self.password_hash = generate_password_hash(password)

    def check_password(self, password):
        """验证密码"""
        return check_password_hash(self.password_hash, password)

    def __repr__(self):
        return f'<Admin {self.username}>'

class PromptTemplate(db.Model):
    """AI提示词模板模型"""
    __tablename__ = 'prompt_templates'

    id = db.Column(db.Integer, primary_key=True)
    key = db.Column(db.String(50), unique=True, nullable=False, comment='唯一标识(tags/features/description)')
    name = db.Column(db.String(100), nullable=False, comment='模板名称')
    system_prompt = db.Column(db.Text, nullable=False, comment='系统提示词')
    user_prompt_template = db.Column(db.Text, nullable=False, comment='用户提示词模板(支持变量)')
    description = db.Column(db.String(200), comment='模板说明')
    is_active = db.Column(db.Boolean, default=True, comment='是否启用')
    created_at = db.Column(db.DateTime, default=datetime.now, comment='创建时间')
    updated_at = db.Column(db.DateTime, default=datetime.now, onupdate=datetime.now, comment='更新时间')

    def __repr__(self):
        return f'<PromptTemplate {self.name}>'

    def to_dict(self):
        """转换为字典"""
        return {
            'id': self.id,
            'key': self.key,
            'name': self.name,
            'system_prompt': self.system_prompt,
            'user_prompt_template': self.user_prompt_template,
            'description': self.description,
            'is_active': self.is_active,
            'created_at': self.created_at.strftime('%Y-%m-%d %H:%M:%S') if self.created_at else None,
            'updated_at': self.updated_at.strftime('%Y-%m-%d %H:%M:%S') if self.updated_at else None
        }