"""Campaign application tracking — Phase 7.4 Campaign Engine.

Independent aggregate (no SQLAlchemy relationships), same as other Loyalty
aggregates. Points are always the ledger's responsibility; this row only
records that a campaign granted N points to a member at a given rule version.
"""
from __future__ import annotations

import uuid
from datetime import datetime

from sqlalchemy import Index, Integer, String, UniqueConstraint
from sqlalchemy.orm import Mapped, mapped_column
from sqlalchemy.types import JSON

from app.core.database import Base
from app.models.base import TenantMixin, TimestampMixin, UUIDPrimaryKeyMixin
from app.models.types import CampaignApplicationStatus, GUID


class CampaignApplication(
    Base,
    UUIDPrimaryKeyMixin,
    TenantMixin,
    TimestampMixin,
):
    """Record of a campaign's point grant applied to a member's point account."""

    __tablename__ = "campaign_applications"

    campaign_id: Mapped[uuid.UUID] = mapped_column(GUID(), nullable=False)
    program_id: Mapped[uuid.UUID] = mapped_column(GUID(), nullable=False)
    member_id: Mapped[uuid.UUID] = mapped_column(GUID(), nullable=False)
    point_account_id: Mapped[uuid.UUID] = mapped_column(GUID(), nullable=False)
    rule_version: Mapped[int] = mapped_column(Integer, nullable=False)
    points_granted: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    ledger_entry_id: Mapped[uuid.UUID | None] = mapped_column(GUID(), nullable=True)
    status: Mapped[CampaignApplicationStatus] = mapped_column(
        default=CampaignApplicationStatus.APPLIED, nullable=False
    )
    idempotency_key: Mapped[str | None] = mapped_column(String(100), nullable=True)
    actor_user_id: Mapped[str | None] = mapped_column(String(100), nullable=True)
    metadata_json: Mapped[dict | None] = mapped_column(JSON, nullable=True)

    __table_args__ = (
        UniqueConstraint(
            "tenant_id",
            "idempotency_key",
            name="uq_campaign_applications_tenant_idempotency",
        ),
        Index(
            "ix_campaign_applications_campaign_member",
            "tenant_id",
            "campaign_id",
            "member_id",
        ),
    )