from datetime import datetime
from typing import TYPE_CHECKING

from sqlalchemy import Boolean, DateTime, ForeignKey, String, UniqueConstraint, func
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.database.base import Base

if TYPE_CHECKING:
    from app.auth.models import EmailVerificationToken, PasswordResetToken
    from app.chats.models import ChatMember
    from app.messages.models import Message


class User(Base):
    __tablename__ = "users"

    id: Mapped[int] = mapped_column(primary_key=True, index=True)
    name: Mapped[str] = mapped_column(String(100), nullable=False)
    username: Mapped[str] = mapped_column(String(50), unique=True, index=True)
    email: Mapped[str] = mapped_column(String(255), unique=True, index=True)
    password_hash: Mapped[str] = mapped_column(String(255))
    avatar_url: Mapped[str | None] = mapped_column(String(512), nullable=True)
    bio: Mapped[str | None] = mapped_column(String(500), nullable=True)
    email_verified: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False, index=True)
    allow_private_messages: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False, server_default="true")
    privacy_private_messages: Mapped[str] = mapped_column(String(16), nullable=False, default="everyone", server_default="everyone")
    privacy_last_seen: Mapped[str] = mapped_column(String(16), nullable=False, default="everyone", server_default="everyone")
    privacy_avatar: Mapped[str] = mapped_column(String(16), nullable=False, default="everyone", server_default="everyone")
    privacy_group_invites: Mapped[str] = mapped_column(String(16), nullable=False, default="everyone", server_default="everyone")
    twofa_enabled: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False, server_default="false")
    twofa_secret: Mapped[str | None] = mapped_column(String(64), nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        onupdate=func.now(),
        nullable=False,
    )
    last_seen_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True, index=True)
    access_revoked_before: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)

    memberships: Mapped[list["ChatMember"]] = relationship(back_populates="user", cascade="all, delete-orphan")
    sent_messages: Mapped[list["Message"]] = relationship(back_populates="sender")
    email_verification_tokens: Mapped[list["EmailVerificationToken"]] = relationship(
        back_populates="user",
        cascade="all, delete-orphan",
    )
    password_reset_tokens: Mapped[list["PasswordResetToken"]] = relationship(
        back_populates="user",
        cascade="all, delete-orphan",
    )


class BlockedUser(Base):
    __tablename__ = "blocked_users"
    __table_args__ = (UniqueConstraint("user_id", "blocked_user_id", name="uq_blocked_users_user_target"),)

    id: Mapped[int] = mapped_column(primary_key=True, index=True)
    user_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    blocked_user_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), nullable=False)


class UserContact(Base):
    __tablename__ = "user_contacts"
    __table_args__ = (UniqueConstraint("user_id", "contact_user_id", name="uq_user_contacts_pair"),)

    id: Mapped[int] = mapped_column(primary_key=True, index=True)
    user_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    contact_user_id: Mapped[int] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), nullable=False)