from datetime import datetime
from flask_sqlalchemy import SQLAlchemy
from flask_login import UserMixin

db = SQLAlchemy()

class User(UserMixin, db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True, nullable=False)
    role = db.Column(db.String(20), nullable=False, default='user')
    contact = db.Column(db.String(100))
    dingtalk_userid = db.Column(db.String(100), unique=True, nullable=False)
    dingtalk_name = db.Column(db.String(100))
    dingtalk_dept = db.Column(db.String(200))
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    
    def is_admin(self):
        return self.role == 'admin'

class Demand(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(200), nullable=False)
    content = db.Column(db.Text, nullable=False)
    branch = db.Column(db.String(50), nullable=False)
    contact = db.Column(db.String(100), nullable=False)
    is_public = db.Column(db.Boolean, default=True)
    answer = db.Column(db.Text)
    answered_at = db.Column(db.DateTime)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow)
    
    user = db.relationship('User', backref=db.backref('demands', lazy=True))
    
    def can_edit(self, current_user):
        if current_user.is_admin():
            return True
        return self.user_id == current_user.id