from datetime import datetime
from typing import Optional

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

from app.database import Base


class Record(Base):
    __tablename__ = "records"

    id: Mapped[int] = mapped_column(primary_key=True)
    table_id: Mapped[int] = mapped_column(
        ForeignKey("tables.id", ondelete="CASCADE"), nullable=False, index=True
    )
    created_by: Mapped[int] = mapped_column(ForeignKey("users.id"), nullable=True)
    updated_by: Mapped[int] = mapped_column(ForeignKey("users.id"), nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=func.now())
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, default=func.now(), onupdate=func.now()
    )

    # Relationships
    table = relationship("Table", back_populates="records")
    created_by_user = relationship(
        "User", back_populates="created_records", foreign_keys=[created_by]
    )
    updated_by_user = relationship(
        "User", back_populates="updated_records", foreign_keys=[updated_by]
    )
    cell_values = relationship(
        "CellValue", back_populates="record", cascade="all, delete-orphan"
    )
    comments = relationship(
        "Comment", back_populates="record", cascade="all, delete-orphan"
    )
    attachments = relationship(
        "Attachment", back_populates="record", cascade="all, delete-orphan"
    )

    __table_args__ = (Index("idx_records_table", "table_id"),)

    def __repr__(self):
        return f"<Record(id={self.id}, table_id={self.table_id})>"


class CellValue(Base):
    __tablename__ = "cell_values"

    id: Mapped[int] = mapped_column(primary_key=True)
    record_id: Mapped[int] = mapped_column(
        ForeignKey("records.id", ondelete="CASCADE"), nullable=False, index=True
    )
    column_id: Mapped[int] = mapped_column(
        ForeignKey("columns.id", ondelete="CASCADE"), nullable=False, index=True
    )
    value: Mapped[Optional[str]] = mapped_column(String, nullable=True)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, default=func.now(), onupdate=func.now()
    )

    # Relationships
    record = relationship("Record", back_populates="cell_values")
    column = relationship("Column", back_populates="cell_values")

    __table_args__ = (
        Index("idx_cell_values_record", "record_id"),
        Index("idx_cell_values_column", "column_id"),
    )

    def __repr__(self):
        return f"<CellValue(record_id={self.record_id}, column_id={self.column_id})>"