from datetime import datetime
from flask_login import UserMixin
from werkzeug.security import generate_password_hash, check_password_hash
from app import db, login_manager
class PartnerSite(db.Model):
    __tablename__ = 'partner_sites'
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(100), unique=True, nullable=False, index=True) 
    url = db.Column(db.String(255), nullable=True)
    is_active = db.Column(db.Boolean, default=True, nullable=False, index=True)
    def __repr__(self):
        return f'<PartnerSite {self.name}>'
class User(UserMixin, db.Model):
    __tablename__ = 'users'
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(64), unique=True, index=True, nullable=False)
    email = db.Column(db.String(120), unique=True, index=True, nullable=False)
    password_hash = db.Column(db.String(256))
    role = db.Column(db.String(20), default='user', index=True) # 'user', 'admin', 'trusted_user'
    status = db.Column(db.String(20), default='pending', index=True) # 'pending', 'active'
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    pt_site = db.Column(db.String(100)) # 注册时填写的站点
    uid = db.Column(db.String(50))     # 注册时填写的 UID
    reports = db.relationship('Report', backref='reporter', lazy='dynamic')
    # comments = db.relationship('Comment', backref='author', lazy='dynamic')
    comments = db.relationship('Comment', back_populates='author', lazy='dynamic')
    def set_password(self, password):
        self.password_hash = generate_password_hash(password)

    def check_password(self, password):
        return check_password_hash(self.password_hash, password)

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

@login_manager.user_loader
def load_user(user_id):
    return User.query.get(int(user_id))

class Report(db.Model):
    __tablename__ = 'reports'
    id = db.Column(db.Integer, primary_key=True)
    reporter_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False)
    reported_pt_site = db.Column(db.String(100), nullable=False)
    reported_uid = db.Column(db.String(50))
    reported_email = db.Column(db.String(120), index=True, nullable=False)
    reason_category = db.Column(db.String(50), nullable=False) # e.g., 'cheating', 'trading', 'spam'
    description = db.Column(db.Text, nullable=False)
    status = db.Column(db.String(20), index=True, default='pending') # 'pending', 'in_review', 'approved', 'rejected'
    created_at = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    comments = db.relationship('Comment', backref='report', lazy='dynamic', cascade='all, delete-orphan')
    
    evidences = db.relationship('Evidence', backref='report', lazy='dynamic', cascade="all, delete-orphan")
    blacklist_entry = db.relationship('Blacklist', backref='report', uselist=False) # one-to-one

    def __repr__(self):
        return f'<Report {self.id}>'

class Evidence(db.Model):
    __tablename__ = 'evidences'
    id = db.Column(db.Integer, primary_key=True)
    report_id = db.Column(db.Integer, db.ForeignKey('reports.id'), nullable=False)
    file_url = db.Column(db.String(512), nullable=False) # 存储OSS或本地路径
    file_type = db.Column(db.String(20)) # 'image', 'zip', 'text'
    created_at = db.Column(db.DateTime, default=datetime.utcnow)

    def __repr__(self):
        return f'<Evidence {self.id} for Report {self.report_id}>'

class Blacklist(db.Model):
    __tablename__ = 'blacklist'
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(64), index=True)
    email = db.Column(db.String(120), index=True)
    normalized_email = db.Column(db.String(120), index=True) # 归一化后的邮箱
    pt_site = db.Column(db.String(100), index=True)
    uid = db.Column(db.String(50))
    report_id = db.Column(db.Integer, db.ForeignKey('reports.id'), unique=True) # 确保一个举报只对应一个黑名单条目
    status = db.Column(db.String(20), default='active', index=True) # 'active', 'appealed_ok', 'expired'
    created_at = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    appeals = db.relationship('Appeal', backref='blacklist_entry', lazy='dynamic')
    def __repr__(self):
        return f'<Blacklist {self.normalized_email} on {self.pt_site}>'
class Comment(db.Model):
    __tablename__ = 'comments'
    id = db.Column(db.Integer, primary_key=True)
    body = db.Column(db.Text)
    timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    author_id = db.Column(db.Integer, db.ForeignKey('users.id'))
    report_id = db.Column(db.Integer, db.ForeignKey('reports.id'))
    # author = db.relationship('User') # 方便地通过 comment.author 访问用户
    author = db.relationship('User', back_populates='comments')
class Appeal(db.Model):
    __tablename__ = 'appeals'
    id = db.Column(db.Integer, primary_key=True)
    reason = db.Column(db.Text, nullable=False)  # 用户最初的申诉理由
    status = db.Column(db.String(64), nullable=False, default='awaiting_admin_reply') # 状态: awaiting_admin_reply, awaiting_user_reply, closed_approved, closed_rejected
    created_at = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    # 关系
    appealer_id = db.Column(db.Integer, db.ForeignKey('users.id')) # 申诉人
    blacklist_entry_id = db.Column(db.Integer, db.ForeignKey('blacklist.id')) # 关联的黑名单条目
    messages = db.relationship('AppealMessage', backref='appeal', lazy='dynamic', cascade='all, delete-orphan')
    appealer = db.relationship('User', backref='appeals')
    def __repr__(self):
        return f'<Appeal {self.id}>'
class AppealMessage(db.Model):
    __tablename__ = 'appeal_messages'
    id = db.Column(db.Integer, primary_key=True)
    body = db.Column(db.Text, nullable=False)
    timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    
    # 关系
    author_id = db.Column(db.Integer, db.ForeignKey('users.id')) # 消息发送者
    appeal_id = db.Column(db.Integer, db.ForeignKey('appeals.id'))
    def __repr__(self):
        return f'<AppealMessage {self.id}>'