"""Referral Attribution APIs — attribute/convert/reward/cancel (Phase 7.5)."""
from __future__ import annotations

from uuid import UUID

from fastapi import APIRouter, Depends, status
from sqlalchemy.ext.asyncio import AsyncSession

from app.api.deps import get_db, get_pagination, require_tenant
from app.api.permissions import require_permissions
from app.permissions.definitions import (
    LOYALTY_REFERRALS_ATTRIBUTE,
    LOYALTY_REFERRALS_CANCEL,
    LOYALTY_REFERRALS_CONVERT,
    LOYALTY_REFERRALS_REWARD,
    LOYALTY_REFERRALS_VIEW,
)
from app.schemas.referral import (
    ReferralAttributeRequest,
    ReferralAttributionPage,
    ReferralAttributionRead,
    ReferralCancelRequest,
)
from app.services.referral_engine import ReferralEngineService
from shared.pagination import PaginationParams
from shared.security import CurrentUser

router = APIRouter()


@router.post(
    "/attribute",
    response_model=ReferralAttributionRead,
    status_code=status.HTTP_201_CREATED,
)
async def attribute_referral(
    body: ReferralAttributeRequest,
    tenant_id: UUID = Depends(require_tenant),
    db: AsyncSession = Depends(get_db),
    user: CurrentUser = Depends(require_permissions(LOYALTY_REFERRALS_ATTRIBUTE)),
):
    return await ReferralEngineService(db).attribute(tenant_id, body, actor=user)


@router.get("", response_model=ReferralAttributionPage)
async def list_referral_attributions(
    referral_program_id: UUID | None = None,
    tenant_id: UUID = Depends(require_tenant),
    pagination: PaginationParams = Depends(get_pagination),
    db: AsyncSession = Depends(get_db),
    _user: CurrentUser = Depends(require_permissions(LOYALTY_REFERRALS_VIEW)),
):
    rows, total = await ReferralEngineService(db).list_attributions(
        tenant_id,
        offset=pagination.offset,
        limit=pagination.page_size,
        referral_program_id=referral_program_id,
    )
    return ReferralAttributionPage(
        items=rows, total=total, offset=pagination.offset, limit=pagination.page_size
    )


@router.get("/{attribution_id}", response_model=ReferralAttributionRead)
async def get_referral_attribution(
    attribution_id: UUID,
    tenant_id: UUID = Depends(require_tenant),
    db: AsyncSession = Depends(get_db),
    _user: CurrentUser = Depends(require_permissions(LOYALTY_REFERRALS_VIEW)),
):
    return await ReferralEngineService(db).get_attribution(tenant_id, attribution_id)


@router.post("/{attribution_id}/convert", response_model=ReferralAttributionRead)
async def convert_referral(
    attribution_id: UUID,
    tenant_id: UUID = Depends(require_tenant),
    db: AsyncSession = Depends(get_db),
    user: CurrentUser = Depends(require_permissions(LOYALTY_REFERRALS_CONVERT)),
):
    return await ReferralEngineService(db).convert(tenant_id, attribution_id, actor=user)


@router.post("/{attribution_id}/reward", response_model=ReferralAttributionRead)
async def reward_referral(
    attribution_id: UUID,
    tenant_id: UUID = Depends(require_tenant),
    db: AsyncSession = Depends(get_db),
    user: CurrentUser = Depends(require_permissions(LOYALTY_REFERRALS_REWARD)),
):
    return await ReferralEngineService(db).reward(tenant_id, attribution_id, actor=user)


@router.post("/{attribution_id}/cancel", response_model=ReferralAttributionRead)
async def cancel_referral(
    attribution_id: UUID,
    body: ReferralCancelRequest,
    tenant_id: UUID = Depends(require_tenant),
    db: AsyncSession = Depends(get_db),
    user: CurrentUser = Depends(require_permissions(LOYALTY_REFERRALS_CANCEL)),
):
    return await ReferralEngineService(db).cancel(
        tenant_id, attribution_id, body, actor=user
    )