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

Platform (unauthenticated) pages for pricing and signup:
- Pricing page
- Signup wizard
- Signup success
"""

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

from app.core.database import get_db
from app.modules.core.utils.page_context import get_platform_context
from app.templates_config import templates


def _require_platform(request: Request):
    """Get the current platform or raise 404. Platform must always be known."""
    platform = getattr(request.state, "platform", None)
    if not platform:
        raise HTTPException(
            status_code=404,
            detail="Platform not detected. Pricing and signup require a known platform.",
        )
    return platform

router = APIRouter()


def _get_tiers_data(db: Session, platform_id: int) -> list[dict]:
    """Build tier data for display in templates from database."""
    from app.modules.billing.models import SubscriptionTier, TierCode

    query = db.query(SubscriptionTier).filter(
        SubscriptionTier.is_active == True,
        SubscriptionTier.is_public == True,
        SubscriptionTier.platform_id == platform_id,
    )
    tiers_db = query.order_by(SubscriptionTier.display_order).all()

    tiers = []
    for tier in tiers_db:
        feature_codes = sorted(tier.get_feature_codes())
        tiers.append({
            "code": tier.code,
            "name": tier.name,
            "price_monthly": tier.price_monthly_cents / 100,
            "price_annual": (tier.price_annual_cents / 100) if tier.price_annual_cents else None,
            "feature_codes": feature_codes,
            "products_limit": tier.get_limit_for_feature("products_limit"),
            "orders_per_month": tier.get_limit_for_feature("orders_per_month"),
            "team_members": tier.get_limit_for_feature("team_members"),
            "is_popular": tier.code == TierCode.PROFESSIONAL.value,
            "is_enterprise": tier.code == TierCode.ENTERPRISE.value,
        })
    return tiers


# ============================================================================
# PRICING PAGE
# ============================================================================


@router.get("/pricing", response_class=HTMLResponse, name="platform_pricing")
async def pricing_page(
    request: Request,
    db: Session = Depends(get_db),
):
    """
    Standalone pricing page with detailed tier comparison.

    Tiers are filtered by the current platform (detected from domain/path).
    """
    platform = _require_platform(request)
    context = get_platform_context(request, db)
    context["tiers"] = _get_tiers_data(db, platform_id=platform.id)
    context["page_title"] = "Pricing"

    return templates.TemplateResponse(
        "billing/platform/pricing.html",
        context,
    )


# ============================================================================
# SIGNUP WIZARD
# ============================================================================


@router.get("/signup", response_class=HTMLResponse, name="platform_signup")
async def signup_page(
    request: Request,
    tier: str | None = None,
    annual: bool = False,
    db: Session = Depends(get_db),
):
    """
    Multi-step signup wizard.

    Routes to platform-specific signup templates. Each platform defines
    its own signup flow (different steps, different UI).

    Query params:
    - tier: Pre-selected tier code
    - annual: Pre-select annual billing
    """
    platform = _require_platform(request)
    context = get_platform_context(request, db)
    context["page_title"] = "Start Your Free Trial"
    context["selected_tier"] = tier
    context["is_annual"] = annual
    context["tiers"] = _get_tiers_data(db, platform_id=platform.id)

    return templates.TemplateResponse(
        "billing/platform/signup.html",
        context,
    )


@router.get(
    "/signup/success", response_class=HTMLResponse, name="platform_signup_success"
)
async def signup_success_page(
    request: Request,
    store_code: str | None = None,
    db: Session = Depends(get_db),
):
    """
    Signup success page.

    Shown after successful account creation.
    """
    context = get_platform_context(request, db)
    context["page_title"] = "Welcome to Orion!"
    context["store_code"] = store_code

    return templates.TemplateResponse(
        "billing/platform/signup-success.html",
        context,
    )