# app/modules/loyalty/routes/api/storefront.py
"""
Loyalty Module - Storefront API Routes

Customer-facing endpoints for:
- View loyalty card and balance
- View transaction history
- Self-service enrollment
- Get program information

Uses store from middleware context (StoreContextMiddleware).
"""

import logging

from fastapi import APIRouter, Depends, HTTPException, Query, Request
from sqlalchemy.orm import Session

from app.api.deps import get_current_customer_api
from app.core.database import get_db
from app.modules.customers.schemas import CustomerContext
from app.modules.loyalty.schemas import (
    CardEnrollRequest,
    CardResponse,
    ProgramResponse,
)
from app.modules.loyalty.services import card_service, program_service
from app.modules.tenancy.exceptions import StoreNotFoundException

storefront_router = APIRouter()
logger = logging.getLogger(__name__)


# =============================================================================
# Public Endpoints (No Authentication Required)
# =============================================================================


@storefront_router.get("/loyalty/program")
def get_program_info(
    request: Request,
    db: Session = Depends(get_db),
):
    """
    Get loyalty program information for current store.
    Public endpoint - no authentication required.
    """
    store = getattr(request.state, "store", None)
    if not store:
        raise StoreNotFoundException("context", identifier_type="subdomain")

    program = program_service.get_program_by_store(db, store.id)
    if not program:
        return None

    response = ProgramResponse.model_validate(program)
    response.is_stamps_enabled = program.is_stamps_enabled
    response.is_points_enabled = program.is_points_enabled
    response.display_name = program.display_name

    return response


@storefront_router.post("/loyalty/enroll")
def self_enroll(
    request: Request,
    data: CardEnrollRequest,
    db: Session = Depends(get_db),
):
    """
    Self-service enrollment.
    Public endpoint - customers can enroll via QR code without authentication.
    """
    store = getattr(request.state, "store", None)
    if not store:
        raise StoreNotFoundException("context", identifier_type="subdomain")

    # Check if self-enrollment is allowed
    settings = program_service.get_merchant_settings(db, store.merchant_id)
    if settings and not settings.allow_self_enrollment:
        raise HTTPException(403, "Self-enrollment is not available")

    # Resolve customer_id
    customer_id = data.customer_id
    if not customer_id and data.email:
        from app.modules.customers.models.customer import Customer

        customer = (
            db.query(Customer)
            .filter(Customer.email == data.email, Customer.store_id == store.id)
            .first()
        )
        if not customer:
            raise HTTPException(400, "Customer not found with provided email")
        customer_id = customer.id

    if not customer_id:
        raise HTTPException(400, "Either customer_id or email is required")

    logger.info(f"Self-enrollment for customer {customer_id} at store {store.subdomain}")

    card = card_service.enroll_customer_for_store(db, customer_id, store.id)

    return CardResponse.model_validate(card)


# =============================================================================
# Authenticated Endpoints
# =============================================================================


@storefront_router.get("/loyalty/card")
def get_my_card(
    request: Request,
    customer: CustomerContext = Depends(get_current_customer_api),
    db: Session = Depends(get_db),
):
    """
    Get customer's loyalty card and program info.
    Returns card details, program info, and available rewards.
    """
    store = getattr(request.state, "store", None)
    if not store:
        raise StoreNotFoundException("context", identifier_type="subdomain")

    logger.debug(f"Getting loyalty card for customer {customer.id}")

    # Get program
    program = program_service.get_program_by_store(db, store.id)
    if not program:
        return {"card": None, "program": None, "locations": []}

    # Look up card by customer ID and merchant
    card = card_service.get_card_by_customer_and_merchant(
        db,
        customer_id=customer.id,
        merchant_id=program.merchant_id,
    )

    if not card:
        return {"card": None, "program": None, "locations": []}

    # Get merchant locations
    from app.modules.tenancy.models import Store as StoreModel
    locations = (
        db.query(StoreModel)
        .filter(StoreModel.merchant_id == program.merchant_id, StoreModel.is_active == True)
        .all()
    )

    program_response = ProgramResponse.model_validate(program)
    program_response.is_stamps_enabled = program.is_stamps_enabled
    program_response.is_points_enabled = program.is_points_enabled
    program_response.display_name = program.display_name

    return {
        "card": CardResponse.model_validate(card),
        "program": program_response,
        "locations": [{"id": v.id, "name": v.name} for v in locations],
    }


@storefront_router.get("/loyalty/transactions")
def get_my_transactions(
    request: Request,
    skip: int = Query(0, ge=0),
    limit: int = Query(20, ge=1, le=100),
    customer: CustomerContext = Depends(get_current_customer_api),
    db: Session = Depends(get_db),
):
    """
    Get customer's loyalty transaction history.
    """
    store = getattr(request.state, "store", None)
    if not store:
        raise StoreNotFoundException("context", identifier_type="subdomain")

    logger.debug(f"Getting transactions for customer {customer.id}")

    # Get program
    program = program_service.get_program_by_store(db, store.id)
    if not program:
        return {"transactions": [], "total": 0}

    # Get card
    card = card_service.get_card_by_customer_and_merchant(
        db,
        customer_id=customer.id,
        merchant_id=program.merchant_id,
    )

    if not card:
        return {"transactions": [], "total": 0}

    # Get transactions
    from app.modules.loyalty.models import LoyaltyTransaction
    from app.modules.tenancy.models import Store as StoreModel

    query = (
        db.query(LoyaltyTransaction)
        .filter(LoyaltyTransaction.card_id == card.id)
        .order_by(LoyaltyTransaction.transaction_at.desc())
    )

    total = query.count()
    transactions = query.offset(skip).limit(limit).all()

    # Build response with store names
    tx_responses = []
    for tx in transactions:
        tx_data = {
            "id": tx.id,
            "transaction_type": tx.transaction_type.value if hasattr(tx.transaction_type, "value") else str(tx.transaction_type),
            "points_delta": tx.points_delta,
            "stamps_delta": tx.stamps_delta,
            "points_balance_after": tx.points_balance_after,
            "stamps_balance_after": tx.stamps_balance_after,
            "transaction_at": tx.transaction_at.isoformat() if tx.transaction_at else None,
            "notes": tx.notes,
            "store_name": None,
        }

        if tx.store_id:
            store_obj = db.query(StoreModel).filter(StoreModel.id == tx.store_id).first()
            if store_obj:
                tx_data["store_name"] = store_obj.name

        tx_responses.append(tx_data)

    return {"transactions": tx_responses, "total": total}