81 lines
2.7 KiB
Python
81 lines
2.7 KiB
Python
from __future__ import annotations
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from datetime import date, datetime
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from enum import Enum
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from typing import TYPE_CHECKING, List
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from sqlalchemy import (
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Date,
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DateTime,
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Enum as SQLEnum,
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ForeignKey,
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Integer,
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Numeric,
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String,
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Text,
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)
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from sqlalchemy.orm import Mapped, mapped_column, relationship
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from sqlalchemy.sql import func
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from config.database import Base
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from .metadata import ResourceType
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if TYPE_CHECKING: # pragma: no cover
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from .financial_input import FinancialInput
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from .project import Project
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from .simulation_parameter import SimulationParameter
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class ScenarioStatus(str, Enum):
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"""Lifecycle states for project scenarios."""
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DRAFT = "draft"
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ACTIVE = "active"
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ARCHIVED = "archived"
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class Scenario(Base):
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"""A specific configuration of assumptions for a project."""
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__tablename__ = "scenarios"
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id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
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project_id: Mapped[int] = mapped_column(
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ForeignKey("projects.id", ondelete="CASCADE"), nullable=False, index=True
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)
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name: Mapped[str] = mapped_column(String(255), nullable=False)
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description: Mapped[str | None] = mapped_column(Text, nullable=True)
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status: Mapped[ScenarioStatus] = mapped_column(
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SQLEnum(ScenarioStatus), nullable=False, default=ScenarioStatus.DRAFT
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)
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start_date: Mapped[date | None] = mapped_column(Date, nullable=True)
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end_date: Mapped[date | None] = mapped_column(Date, nullable=True)
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discount_rate: Mapped[float | None] = mapped_column(Numeric(5, 2), nullable=True)
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currency: Mapped[str | None] = mapped_column(String(3), nullable=True)
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primary_resource: Mapped[ResourceType | None] = mapped_column(
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SQLEnum(ResourceType), nullable=True
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)
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created_at: Mapped[datetime] = mapped_column(
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DateTime(timezone=True), nullable=False, server_default=func.now()
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)
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updated_at: Mapped[datetime] = mapped_column(
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DateTime(timezone=True), nullable=False, server_default=func.now(), onupdate=func.now()
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)
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project: Mapped["Project"] = relationship("Project", back_populates="scenarios")
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financial_inputs: Mapped[List["FinancialInput"]] = relationship(
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"FinancialInput",
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back_populates="scenario",
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cascade="all, delete-orphan",
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passive_deletes=True,
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)
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simulation_parameters: Mapped[List["SimulationParameter"]] = relationship(
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"SimulationParameter",
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back_populates="scenario",
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cascade="all, delete-orphan",
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passive_deletes=True,
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)
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def __repr__(self) -> str: # pragma: no cover
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return f"Scenario(id={self.id!r}, name={self.name!r}, project_id={self.project_id!r})"
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