# app/modules/loyalty/routes/pages/merchant.py
"""
Loyalty Merchant Page Routes (HTML rendering).

Merchant portal pages for:
- Loyalty program (read-only view)
- Loyalty program edit
- Loyalty analytics (aggregate stats across all stores)

Authentication: merchant_token cookie or Authorization header.

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

import logging

from fastapi import APIRouter, Depends, Request
from fastapi.responses import HTMLResponse
from sqlalchemy.orm import Session

from app.api.deps import (
    get_current_merchant_from_cookie_or_header,
    get_merchant_for_current_user_page,
)
from app.core.database import get_db
from app.modules.core.utils.page_context import get_context_for_frontend
from app.modules.enums import FrontendType
from app.modules.loyalty.services import program_service
from app.modules.tenancy.models import Merchant
from app.modules.tenancy.schemas.auth import UserContext
from app.templates_config import templates

logger = logging.getLogger(__name__)

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

router = APIRouter()


# ============================================================================
# Helper
# ============================================================================


def _get_merchant_context(
    request: Request,
    db: Session,
    current_user: UserContext,
    **extra_context,
) -> dict:
    """Build template context for merchant loyalty pages."""
    return get_context_for_frontend(
        FrontendType.MERCHANT,
        request,
        db,
        user=current_user,
        **extra_context,
    )


# ============================================================================
# LOYALTY PROGRAM (Read-only view)
# ============================================================================


@router.get("/program", response_class=HTMLResponse, include_in_schema=False)
async def merchant_loyalty_program(
    request: Request,
    current_user: UserContext = Depends(get_current_merchant_from_cookie_or_header),
    merchant: Merchant = Depends(get_merchant_for_current_user_page),
    db: Session = Depends(get_db),
):
    """
    Render merchant loyalty program view page.

    Shows read-only program configuration with link to edit.
    """
    merchant_id = merchant.id
    stats = {}
    try:
        stats = program_service.get_merchant_stats(db, merchant_id)
    except Exception:
        logger.warning(
            f"Failed to load loyalty stats for merchant {merchant_id}",
            exc_info=True,
        )

    context = _get_merchant_context(
        request,
        db,
        current_user,
        loyalty_stats=stats,
        merchant_id=merchant_id,
    )
    return templates.TemplateResponse(
        "loyalty/merchant/program.html",
        context,
    )


# ============================================================================
# LOYALTY PROGRAM EDIT
# ============================================================================


@router.get("/program/edit", response_class=HTMLResponse, include_in_schema=False)
async def merchant_loyalty_program_edit(
    request: Request,
    current_user: UserContext = Depends(get_current_merchant_from_cookie_or_header),
    merchant: Merchant = Depends(get_merchant_for_current_user_page),
    db: Session = Depends(get_db),
):
    """
    Render merchant loyalty program edit page.

    Allows merchant to create, configure, and manage their loyalty program.
    """
    context = _get_merchant_context(
        request,
        db,
        current_user,
        merchant_id=merchant.id,
    )
    return templates.TemplateResponse(
        "loyalty/merchant/program-edit.html",
        context,
    )


# ============================================================================
# LOYALTY ANALYTICS
# ============================================================================


@router.get("/analytics", response_class=HTMLResponse, include_in_schema=False)
async def merchant_loyalty_analytics(
    request: Request,
    current_user: UserContext = Depends(get_current_merchant_from_cookie_or_header),
    merchant: Merchant = Depends(get_merchant_for_current_user_page),
    db: Session = Depends(get_db),
):
    """
    Render merchant loyalty analytics page.

    Shows aggregate loyalty program stats across all merchant stores.
    """
    merchant_id = merchant.id
    stats = {}
    try:
        stats = program_service.get_merchant_stats(db, merchant_id)
    except Exception:
        logger.warning(
            f"Failed to load loyalty stats for merchant {merchant_id}",
            exc_info=True,
        )

    context = _get_merchant_context(
        request,
        db,
        current_user,
        loyalty_stats=stats,
        merchant_id=merchant_id,
    )
    return templates.TemplateResponse(
        "loyalty/merchant/analytics.html",
        context,
    )