# app/modules/loyalty/routes/api/merchant.py
"""
Loyalty module merchant routes.

Merchant portal endpoints for full program CRUD:
- Get merchant's loyalty program
- Create a loyalty program
- Update the loyalty program
- Delete the loyalty program

Authentication: Authorization header (API-only, no cookies for CSRF safety).
The user must own at least one active merchant (validated by
get_merchant_for_current_user).

Auto-discovered by the route system (merchant.py in routes/api/ triggers
registration under /api/v1/merchants/loyalty/*).
"""

import logging

from fastapi import APIRouter, Depends
from sqlalchemy.orm import Session

from app.api.deps import get_merchant_for_current_user
from app.core.database import get_db
from app.modules.loyalty.schemas import (
    ProgramCreate,
    ProgramResponse,
    ProgramUpdate,
)
from app.modules.loyalty.schemas.program import MerchantStatsResponse
from app.modules.loyalty.services import program_service
from app.modules.tenancy.models import Merchant

logger = logging.getLogger(__name__)

ROUTE_CONFIG = {
    "prefix": "/loyalty",
}

router = APIRouter()


def _build_program_response(program) -> ProgramResponse:
    """Build a ProgramResponse from a program ORM object."""
    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


# =============================================================================
# Statistics
# =============================================================================


@router.get("/stats", response_model=MerchantStatsResponse)
def get_stats(
    merchant: Merchant = Depends(get_merchant_for_current_user),
    db: Session = Depends(get_db),
):
    """Get merchant-wide loyalty statistics across all locations."""
    stats = program_service.get_merchant_stats(db, merchant.id)
    return MerchantStatsResponse(**stats)


# =============================================================================
# Program CRUD
# =============================================================================


@router.get("/program", response_model=ProgramResponse)
def get_program(
    merchant: Merchant = Depends(get_merchant_for_current_user),
    db: Session = Depends(get_db),
):
    """Get the merchant's loyalty program."""
    program = program_service.require_program_by_merchant(db, merchant.id)
    return _build_program_response(program)


@router.post("/program", response_model=ProgramResponse, status_code=201)
def create_program(
    data: ProgramCreate,
    merchant: Merchant = Depends(get_merchant_for_current_user),
    db: Session = Depends(get_db),
):
    """Create a loyalty program for the merchant."""
    program = program_service.create_program(db, merchant.id, data)
    return _build_program_response(program)


@router.patch("/program", response_model=ProgramResponse)
def update_program(
    data: ProgramUpdate,
    merchant: Merchant = Depends(get_merchant_for_current_user),
    db: Session = Depends(get_db),
):
    """Update the merchant's loyalty program."""
    program = program_service.require_program_by_merchant(db, merchant.id)
    program = program_service.update_program(db, program.id, data)
    return _build_program_response(program)


@router.delete("/program", status_code=204)
def delete_program(
    merchant: Merchant = Depends(get_merchant_for_current_user),
    db: Session = Depends(get_db),
):
    """Delete the merchant's loyalty program."""
    program = program_service.require_program_by_merchant(db, merchant.id)
    program_service.delete_program(db, program.id)
    logger.info(f"Merchant {merchant.id} ({merchant.name}) deleted loyalty program")