from datetime import datetime, timezone

from app.extensions import db


class AddressBook(db.Model):
    __tablename__ = 'address_books'

    id = db.Column(db.Integer, primary_key=True)
    owner_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False, index=True)
    name = db.Column(db.String(255), nullable=False)
    description = db.Column(db.Text, nullable=True)
    color = db.Column(db.String(7), default='#3788d8')
    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))

    contacts = db.relationship('Contact', backref='address_book', lazy='dynamic',
                               cascade='all, delete-orphan')
    shares = db.relationship('AddressBookShare', backref='address_book', lazy='dynamic',
                             cascade='all, delete-orphan')
    # `owner` wird automatisch durch User.address_books backref erzeugt

    def to_dict(self):
        return {
            'id': self.id,
            'owner_id': self.owner_id,
            'name': self.name,
            'description': self.description,
            'color': self.color,
            'created_at': self.created_at.isoformat() if self.created_at else None,
        }


class Contact(db.Model):
    __tablename__ = 'contacts'

    id = db.Column(db.Integer, primary_key=True)
    address_book_id = db.Column(db.Integer, db.ForeignKey('address_books.id'),
                                nullable=False, index=True)
    uid = db.Column(db.String(255), unique=True, nullable=False)
    vcard_data = db.Column(db.Text, nullable=False)

    # Structured name fields
    prefix = db.Column(db.String(64), nullable=True)
    first_name = db.Column(db.String(128), nullable=True)
    middle_name = db.Column(db.String(128), nullable=True)
    last_name = db.Column(db.String(128), nullable=True, index=True)
    suffix = db.Column(db.String(64), nullable=True)
    display_name = db.Column(db.String(255), nullable=True, index=True)
    nickname = db.Column(db.String(128), nullable=True)

    # Organisation
    organization = db.Column(db.String(255), nullable=True)
    department = db.Column(db.String(255), nullable=True)
    job_title = db.Column(db.String(255), nullable=True)

    # Primary fields for quick listing (denormalised)
    primary_email = db.Column(db.String(255), nullable=True, index=True)
    primary_phone = db.Column(db.String(50), nullable=True)

    # JSON-encoded multi-valued fields
    # Each list entry: {"type": "home|work|other|mobile|fax|pager|...", "value": "..."}
    emails = db.Column(db.Text, nullable=True)
    phones = db.Column(db.Text, nullable=True)
    # address: {"type": ..., "street": ..., "po_box": ..., "city": ...,
    #           "region": ..., "postal_code": ..., "country": ...}
    addresses = db.Column(db.Text, nullable=True)
    websites = db.Column(db.Text, nullable=True)
    impp = db.Column(db.Text, nullable=True)     # {"protocol": "skype", "value": "..."}
    categories = db.Column(db.Text, nullable=True)  # ["family", "work", ...]

    # Dates
    birthday = db.Column(db.String(10), nullable=True)    # YYYY-MM-DD
    anniversary = db.Column(db.String(10), nullable=True)

    # Free text
    notes = db.Column(db.Text, nullable=True)

    # Photo: data URL (data:image/jpeg;base64,...) oder http(s)://
    photo = db.Column(db.Text, nullable=True)

    # Legacy column kept for old clients / migrations
    email = db.Column(db.String(255), nullable=True)
    phone = db.Column(db.String(50), nullable=True)

    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))

    def to_dict(self):
        import json

        def _loads(s, default):
            if not s:
                return default
            try:
                return json.loads(s)
            except (ValueError, TypeError):
                return default

        return {
            'id': self.id,
            'address_book_id': self.address_book_id,
            'uid': self.uid,
            'prefix': self.prefix,
            'first_name': self.first_name,
            'middle_name': self.middle_name,
            'last_name': self.last_name,
            'suffix': self.suffix,
            'display_name': self.display_name,
            'nickname': self.nickname,
            'organization': self.organization,
            'department': self.department,
            'job_title': self.job_title,
            'emails': _loads(self.emails, []),
            'phones': _loads(self.phones, []),
            'addresses': _loads(self.addresses, []),
            'websites': _loads(self.websites, []),
            'impp': _loads(self.impp, []),
            'categories': _loads(self.categories, []),
            'birthday': self.birthday,
            'anniversary': self.anniversary,
            'notes': self.notes,
            'photo': self.photo,
            'primary_email': self.primary_email or self.email,
            'primary_phone': self.primary_phone or self.phone,
            'created_at': self.created_at.isoformat() if self.created_at else None,
            'updated_at': self.updated_at.isoformat() if self.updated_at else None,
        }


class AddressBookShare(db.Model):
    __tablename__ = 'address_book_shares'

    id = db.Column(db.Integer, primary_key=True)
    address_book_id = db.Column(db.Integer, db.ForeignKey('address_books.id'),
                                nullable=False, index=True)
    shared_with_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False, index=True)
    permission = db.Column(db.String(20), nullable=False, default='read')
    color = db.Column(db.String(7), nullable=True)  # personal display color

    shared_with = db.relationship('User', backref='shared_address_books')

    __table_args__ = (
        db.UniqueConstraint('address_book_id', 'shared_with_id', name='uq_addressbook_share'),
    )