import uuid
from datetime import datetime, timezone

from sqlalchemy import Boolean, ForeignKey, String, Text, UniqueConstraint, DateTime
from sqlalchemy.orm import Mapped, mapped_column
from sqlalchemy.dialects.postgresql import UUID

from ..database import Base


class UserLanguagePairEntity(Base):
    __tablename__ = "user_language_pair"
    __table_args__ = (UniqueConstraint("user_id", "source_lang", "target_lang"),)

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    source_lang: Mapped[str] = mapped_column(String(2), nullable=False)
    target_lang: Mapped[str] = mapped_column(String(2), nullable=False)


class LearnableWordBankEntryEntity(Base):
    __tablename__ = "learnable_word_bank_entry"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    user_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("users.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    language_pair_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("user_language_pair.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )
    sense_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("dictionary_sense.id", ondelete="SET NULL"),
        nullable=True,
        index=True,
    )
    wordform_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("dictionary_wordform.id", ondelete="SET NULL"),
        nullable=True,
    )
    surface_text: Mapped[str] = mapped_column(Text, nullable=False)
    is_phrase: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
    entry_pathway: Mapped[str] = mapped_column(Text, nullable=False)
    source_article_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), nullable=True
    )
    disambiguation_status: Mapped[str] = mapped_column(Text, nullable=False, default="pending")
    pack_entry_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True),
        ForeignKey("word_bank_pack_entry.id", ondelete="SET NULL"),
        nullable=True,
    )
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        nullable=False,
        default=lambda: datetime.now(timezone.utc),
    )