# 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 vendor from middleware context (VendorContextMiddleware).
"""

import logging

from fastapi import APIRouter, Depends, 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.services import card_service, program_service
from app.modules.loyalty.schemas import (
    CardResponse,
    CardEnrollRequest,
    TransactionListResponse,
    TransactionResponse,
    ProgramResponse,
)
from app.modules.tenancy.exceptions import VendorNotFoundException

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


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


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

    program = program_service.get_program_by_vendor(db, vendor.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


@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.
    """
    vendor = getattr(request.state, "vendor", None)
    if not vendor:
        raise VendorNotFoundException("context", identifier_type="subdomain")

    logger.info(f"Self-enrollment for {data.customer_email} at vendor {vendor.subdomain}")

    card = card_service.enroll_customer(
        db,
        vendor_id=vendor.id,
        customer_email=data.customer_email,
        customer_phone=data.customer_phone,
        customer_name=data.customer_name,
    )

    return CardResponse.model_validate(card)


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


@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.
    """
    vendor = getattr(request.state, "vendor", None)
    if not vendor:
        raise VendorNotFoundException("context", identifier_type="subdomain")

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

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

    # Look up card by customer email
    card = card_service.get_card_by_customer_email(
        db,
        company_id=program.company_id,
        customer_email=customer.email,
    )

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

    # Get company locations
    from app.modules.tenancy.models import Vendor as VendorModel
    locations = (
        db.query(VendorModel)
        .filter(VendorModel.company_id == program.company_id, VendorModel.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],
    }


@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.
    """
    vendor = getattr(request.state, "vendor", None)
    if not vendor:
        raise VendorNotFoundException("context", identifier_type="subdomain")

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

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

    # Get card
    card = card_service.get_card_by_customer_email(
        db,
        company_id=program.company_id,
        customer_email=customer.email,
    )

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

    # Get transactions
    from sqlalchemy import func
    from app.modules.loyalty.models import LoyaltyTransaction
    from app.modules.tenancy.models import Vendor as VendorModel

    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 vendor 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,
            "balance_after": tx.balance_after,
            "transaction_at": tx.transaction_at.isoformat() if tx.transaction_at else None,
            "notes": tx.notes,
            "vendor_name": None,
        }

        if tx.vendor_id:
            vendor_obj = db.query(VendorModel).filter(VendorModel.id == tx.vendor_id).first()
            if vendor_obj:
                tx_data["vendor_name"] = vendor_obj.name

        tx_responses.append(tx_data)

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