"""Reward redemption lifecycle aggregate — Phase 7.3."""
from __future__ import annotations

import uuid
from datetime import datetime

from sqlalchemy import DateTime, 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 GUID, RedemptionStatus


class RewardRedemption(
    Base,
    UUIDPrimaryKeyMixin,
    TenantMixin,
    TimestampMixin,
):
    """Reward redemption lifecycle record. Points ledger remains the source of truth."""

    __tablename__ = "reward_redemptions"

    program_id: Mapped[uuid.UUID] = mapped_column(GUID(), nullable=False)
    reward_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)
    status: Mapped[RedemptionStatus] = mapped_column(
        default=RedemptionStatus.PENDING, nullable=False
    )
    points_spent: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    ledger_entry_id: Mapped[uuid.UUID | None] = mapped_column(GUID(), nullable=True)
    voucher_code: Mapped[str] = mapped_column(String(50), nullable=False)
    idempotency_key: Mapped[str | None] = mapped_column(String(100), nullable=True)
    reason: Mapped[str | None] = mapped_column(String(500), nullable=True)
    cancel_reason: Mapped[str | None] = mapped_column(String(500), nullable=True)
    fulfilled_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True
    )
    cancelled_at: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), nullable=True
    )
    metadata_json: Mapped[dict | None] = mapped_column(JSON, nullable=True)
    actor_user_id: Mapped[str | None] = mapped_column(String(100), nullable=True)

    __table_args__ = (
        UniqueConstraint(
            "tenant_id",
            "idempotency_key",
            name="uq_reward_redemptions_tenant_idempotency",
        ),
        Index("ix_reward_redemptions_reward", "tenant_id", "reward_id"),
        Index("ix_reward_redemptions_member", "tenant_id", "member_id"),
        Index("ix_reward_redemptions_status", "tenant_id", "status"),
    )
