"""
KPI 項目 Model
"""
from datetime import datetime
from typing import Optional, TYPE_CHECKING

from sqlalchemy import String, Integer, DateTime, Text, ForeignKey
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.core.database import Base

if TYPE_CHECKING:
    from app.models.kpi_sheet import KPISheet
    from app.models.kpi_template import KPITemplate


class KPIItem(Base):
    """KPI 項目"""

    __tablename__ = "KPI_D_items"

    id: Mapped[int] = mapped_column(primary_key=True)
    sheet_id: Mapped[int] = mapped_column(ForeignKey("KPI_D_sheets.id", ondelete="CASCADE"), nullable=False)
    template_id: Mapped[Optional[int]] = mapped_column(ForeignKey("KPI_D_templates.id"))
    sort_order: Mapped[int] = mapped_column(Integer, default=0)

    # 項目資訊
    name: Mapped[str] = mapped_column(String(200), nullable=False)
    category: Mapped[str] = mapped_column(String(50), nullable=False)  # financial, customer, internal, learning
    weight: Mapped[int] = mapped_column(Integer, nullable=False)  # 權重百分比 (1-100)

    # 等級標準
    level0_criteria: Mapped[Optional[str]] = mapped_column(Text)
    level1_criteria: Mapped[Optional[str]] = mapped_column(Text)
    level2_criteria: Mapped[Optional[str]] = mapped_column(Text)
    level3_criteria: Mapped[Optional[str]] = mapped_column(Text)
    level4_criteria: Mapped[Optional[str]] = mapped_column(Text)

    # 自評
    self_eval_level: Mapped[Optional[int]] = mapped_column(Integer)  # 0-4
    self_eval_note: Mapped[Optional[str]] = mapped_column(Text)

    # 主管評核
    final_level: Mapped[Optional[int]] = mapped_column(Integer)  # 0-4
    final_note: Mapped[Optional[str]] = mapped_column(Text)

    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)

    # Relationships
    sheet: Mapped["KPISheet"] = relationship("KPISheet", back_populates="items")
    template: Mapped[Optional["KPITemplate"]] = relationship("KPITemplate", back_populates="kpi_items")

    def __repr__(self) -> str:
        return f"<KPIItem id={self.id} name={self.name} weight={self.weight}>"