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

Page routes for the merchant billing portal:
- Dashboard (overview of stores, subscriptions)
- Subscriptions list
- Subscription detail per platform
- Billing history / invoices
- Login page

Authentication: merchant_token cookie or Authorization header.
Login page uses optional auth to check if already logged in.

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

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

from app.api.deps import (
    get_current_merchant_from_cookie_or_header,
    get_current_merchant_optional,
)
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.templates_config import templates
from models.schema.auth import UserContext

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

router = APIRouter()


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


def _get_merchant_context(
    request: Request,
    db: Session,
    current_user: UserContext,
    **extra_context,
) -> dict:
    """
    Build template context for merchant portal pages.

    Uses the module-driven context builder with FrontendType.MERCHANT,
    and adds the authenticated user to the context.

    Args:
        request: FastAPI request
        db: Database session
        current_user: Authenticated merchant user context
        **extra_context: Additional template variables

    Returns:
        Dict of context variables for template rendering
    """
    return get_context_for_frontend(
        FrontendType.MERCHANT,
        request,
        db,
        user=current_user,
        **extra_context,
    )


# ============================================================================
# DASHBOARD
# ============================================================================


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

    Shows an overview of the merchant's stores and subscriptions.
    """
    context = _get_merchant_context(request, db, current_user)
    return templates.TemplateResponse(
        "billing/merchant/dashboard.html",
        context,
    )


# ============================================================================
# SUBSCRIPTIONS
# ============================================================================


@router.get("/subscriptions", response_class=HTMLResponse, include_in_schema=False)
async def merchant_subscriptions_page(
    request: Request,
    current_user: UserContext = Depends(get_current_merchant_from_cookie_or_header),
    db: Session = Depends(get_db),
):
    """
    Render merchant subscriptions list page.

    Shows all subscriptions across platforms with status and tier info.
    """
    context = _get_merchant_context(request, db, current_user)
    return templates.TemplateResponse(
        "billing/merchant/subscriptions.html",
        context,
    )


@router.get(
    "/subscriptions/{platform_id}",
    response_class=HTMLResponse,
    include_in_schema=False,
)
async def merchant_subscription_detail_page(
    request: Request,
    platform_id: int = Path(..., description="Platform ID"),
    current_user: UserContext = Depends(get_current_merchant_from_cookie_or_header),
    db: Session = Depends(get_db),
):
    """
    Render subscription detail page for a specific platform.

    Shows subscription status, tier details, usage, and upgrade options.
    """
    context = _get_merchant_context(
        request, db, current_user, platform_id=platform_id
    )
    return templates.TemplateResponse(
        "billing/merchant/subscription-detail.html",
        context,
    )


# ============================================================================
# BILLING HISTORY
# ============================================================================


@router.get("/billing", response_class=HTMLResponse, include_in_schema=False)
async def merchant_billing_history_page(
    request: Request,
    current_user: UserContext = Depends(get_current_merchant_from_cookie_or_header),
    db: Session = Depends(get_db),
):
    """
    Render billing history page.

    Shows invoice history and payment records for the merchant.
    """
    context = _get_merchant_context(request, db, current_user)
    return templates.TemplateResponse(
        "billing/merchant/billing-history.html",
        context,
    )


# ============================================================================
# LOGIN
# ============================================================================


@router.get("/login", response_class=HTMLResponse, include_in_schema=False)
async def merchant_login_page(
    request: Request,
    current_user: UserContext | None = Depends(get_current_merchant_optional),
    db: Session = Depends(get_db),
):
    """
    Render merchant login page.

    If the user is already authenticated as a merchant owner,
    redirects to the merchant dashboard.
    """
    # Redirect to dashboard if already logged in
    if current_user is not None:
        return RedirectResponse(url="/merchants/billing/", status_code=302)

    context = get_context_for_frontend(
        FrontendType.MERCHANT,
        request,
        db,
    )
    return templates.TemplateResponse(
        "billing/merchant/login.html",
        context,
    )