from datetime import datetime, timezone

from app.extensions import db, bcrypt


class User(db.Model):
    __tablename__ = 'users'

    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True, nullable=False, index=True)
    email = db.Column(db.String(255), unique=True, nullable=True)
    first_name = db.Column(db.String(100), nullable=True)
    last_name = db.Column(db.String(100), nullable=True)
    password_hash = db.Column(db.String(255), nullable=False)
    role = db.Column(db.String(20), default='user', nullable=False)  # 'admin' or 'user'
    master_key_salt = db.Column(db.LargeBinary, nullable=True)  # For password manager
    is_active = db.Column(db.Boolean, default=True, nullable=False)
    storage_quota_mb = db.Column(db.Integer, default=5120)  # 5 GB default
    created_at = db.Column(db.DateTime, default=lambda: datetime.now(timezone.utc))
    updated_at = db.Column(db.DateTime, default=lambda: datetime.now(timezone.utc),
                           onupdate=lambda: datetime.now(timezone.utc))

    # Relationships
    files = db.relationship('File', backref='owner', lazy='dynamic',
                            foreign_keys='File.owner_id')
    calendars = db.relationship('Calendar', backref='owner', lazy='dynamic')
    address_books = db.relationship('AddressBook', backref='owner', lazy='dynamic')
    task_lists = db.relationship('TaskList', backref='owner', lazy='dynamic')
    email_accounts = db.relationship('EmailAccount', backref='user', lazy='dynamic',
                                     order_by='EmailAccount.sort_order')
    password_folders = db.relationship('PasswordFolder', backref='owner', lazy='dynamic')

    def set_password(self, password):
        self.password_hash = bcrypt.generate_password_hash(password).decode('utf-8')

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

    @property
    def full_name(self) -> str:
        """Vor- + Nachname zusammengesetzt, sonst Leerstring."""
        parts = [self.first_name or '', self.last_name or '']
        return ' '.join(p.strip() for p in parts if p and p.strip())

    @property
    def display_name(self) -> str:
        """Voller Name falls vorhanden, sonst Username."""
        return self.full_name or self.username

    def to_dict(self, include_email=False):
        data = {
            'id': self.id,
            'username': self.username,
            'first_name': self.first_name or '',
            'last_name': self.last_name or '',
            'full_name': self.full_name,
            'display_name': self.display_name,
            'role': self.role,
            'is_active': self.is_active,
            'storage_quota_mb': self.storage_quota_mb,
            'created_at': self.created_at.isoformat() if self.created_at else None,
        }
        if include_email:
            data['email'] = self.email
        return data