from datetime import date, datetime
from decimal import Decimal

from sqlalchemy import Date, DateTime, Integer, Numeric, String, Text
from sqlalchemy.orm import Mapped, mapped_column

from app.core.database import Base
from app.modules.business.constants import (
    PriorityValue,
    RiskLevel,
    SourceSystem,
    StatusValue,
)
from app.modules.business.models.common import TimestampMixin


class Project(Base, TimestampMixin):
    __tablename__ = "projects"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    code: Mapped[str] = mapped_column(String(64), unique=True, index=True)
    name: Mapped[str] = mapped_column(String(255), index=True)
    owner: Mapped[str | None] = mapped_column(String(128), nullable=True, index=True)
    status: Mapped[str] = mapped_column(String(64), default=StatusValue.INITIATED, index=True)
    priority: Mapped[str] = mapped_column(String(32), default=PriorityValue.P2)
    progress_percent: Mapped[int] = mapped_column(Integer, default=0)
    risk_level: Mapped[str] = mapped_column(String(32), default=RiskLevel.LOW, index=True)
    budget_amount: Mapped[Decimal] = mapped_column(Numeric(14, 2), default=0)
    actual_amount: Mapped[Decimal] = mapped_column(Numeric(14, 2), default=0)
    start_date: Mapped[date | None] = mapped_column(Date, nullable=True)
    due_date: Mapped[date | None] = mapped_column(Date, nullable=True, index=True)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    source_system: Mapped[str] = mapped_column(String(64), default=SourceSystem.INTERNAL)
    external_id: Mapped[str | None] = mapped_column(String(128), nullable=True, index=True)

class WorkTask(Base, TimestampMixin):
    __tablename__ = "work_tasks"

    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
    code: Mapped[str] = mapped_column(String(64), unique=True, index=True)
    title: Mapped[str] = mapped_column(String(255), index=True)
    project_code: Mapped[str | None] = mapped_column(String(64), nullable=True, index=True)
    owner: Mapped[str | None] = mapped_column(String(128), nullable=True, index=True)
    status: Mapped[str] = mapped_column(String(64), default=StatusValue.TODO, index=True)
    priority: Mapped[str] = mapped_column(String(32), default=PriorityValue.P2)
    due_date: Mapped[date | None] = mapped_column(Date, nullable=True, index=True)
    completed_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
    blocker: Mapped[str | None] = mapped_column(Text, nullable=True)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    source_system: Mapped[str] = mapped_column(String(64), default=SourceSystem.INTERNAL)
    external_id: Mapped[str | None] = mapped_column(String(128), nullable=True, index=True)