from __future__ import annotations

from quart import Blueprint, g, redirect, url_for, make_response
from sqlalchemy import select, func, or_, cast, String, exists
from sqlalchemy.orm import selectinload


from shared.models.order import Order, OrderItem
from shared.browser.app.payments.sumup import create_checkout as sumup_create_checkout
from shared.config import config

from shared.infrastructure.http_utils import vary as _vary, current_url_without_page as _current_url_without_page
from shared.infrastructure.cart_identity import current_cart_identity
from bp.cart.services import check_sumup_status
from shared.browser.app.utils.htmx import is_htmx_request
from shared.sx.helpers import sx_response

from .filters.qs import makeqs_factory, decode


def _owner_filter():
    """Return SQLAlchemy clause restricting orders to current user/session."""
    ident = current_cart_identity()
    if ident["user_id"]:
        return Order.user_id == ident["user_id"]
    if ident["session_id"]:
        return Order.session_id == ident["session_id"]
    return None


def register() -> Blueprint:
    bp = Blueprint("order", __name__, url_prefix='/<int:order_id>')

    ORDERS_PER_PAGE = 10  # keep in sync with browse page size / your preference

    @bp.before_request
    def route():
        # this is the crucial bit for the |qs filter
        g.makeqs_factory = makeqs_factory

    @bp.get("/")
    async def order_detail(order_id: int):
        """
        Show a single order + items.
        """
        owner = _owner_filter()
        if owner is None:
            return await make_response("Order not found", 404)
        result = await g.s.execute(
            select(Order)
            .options(
                selectinload(Order.items)
            )
            .where(Order.id == order_id, owner)
        )
        order = result.scalar_one_or_none()
        if not order:
            return await make_response("Order not found", 404)
        from shared.sx.page import get_template_context
        from sxc.pages.renders import render_order_page, render_order_oob

        ctx = await get_template_context()
        calendar_entries = ctx.get("calendar_entries")

        if not is_htmx_request():
            html = await render_order_page(ctx, order, calendar_entries, url_for)
            return await make_response(html)
        else:
            sx_src = await render_order_oob(ctx, order, calendar_entries, url_for)
            return sx_response(sx_src)

    @bp.get("/pay/")
    async def order_pay(order_id: int):
        """
        Re-open the SumUp payment page for this order.
        If already paid, just go back to the order detail.
        If not, (re)create a SumUp checkout and redirect.
        """
        owner = _owner_filter()
        if owner is None:
            return await make_response("Order not found", 404)
        result = await g.s.execute(select(Order).where(Order.id == order_id, owner))
        order = result.scalar_one_or_none()
        if not order:
            return await make_response("Order not found", 404)

        if order.status == "paid":
            # Already paid; nothing to pay
            return redirect(url_for("orders.order.order_detail", order_id=order.id))

        # Prefer to reuse existing hosted URL if we have one
        if order.sumup_hosted_url:
            return redirect(order.sumup_hosted_url)

        # Otherwise, create a fresh checkout for this order
        redirect_url = url_for("cart_global.checkout_return", order_id=order.id, _external=True)

        sumup_cfg = config().get("sumup", {}) or {}
        webhook_secret = sumup_cfg.get("webhook_secret")

        webhook_url = url_for("cart_global.checkout_webhook", order_id=order.id, _external=True)
        if webhook_secret:
            from urllib.parse import urlencode

            sep = "&" if "?" in webhook_url else "?"
            webhook_url = f"{webhook_url}{sep}{urlencode({'token': webhook_secret})}"

        checkout_data = await sumup_create_checkout(
            order,
            redirect_url=redirect_url,
            webhook_url=webhook_url,
        )

        order.sumup_checkout_id = checkout_data.get("id")
        order.sumup_status = checkout_data.get("status")

        hosted_cfg = checkout_data.get("hosted_checkout") or {}
        hosted_url = hosted_cfg.get("hosted_checkout_url") or checkout_data.get("hosted_checkout_url")
        order.sumup_hosted_url = hosted_url

        await g.s.flush()

        if not hosted_url:
            from shared.sx.page import get_template_context
            from sxc.pages.renders import render_checkout_error_page
            tctx = await get_template_context()
            html = await render_checkout_error_page(tctx, error="No hosted checkout URL returned from SumUp when trying to reopen payment.", order=order)
            return await make_response(html, 500)

        return redirect(hosted_url)
    
    @bp.post("/recheck/")
    async def order_recheck(order_id: int):
        """
        Manually re-check this order's status with SumUp.
        Useful if the webhook hasn't fired or the user didn't return correctly.
        """
        owner = _owner_filter()
        if owner is None:
            return await make_response("Order not found", 404)
        result = await g.s.execute(select(Order).where(Order.id == order_id, owner))
        order = result.scalar_one_or_none()
        if not order:
            return await make_response("Order not found", 404)

        # If we don't have a checkout ID yet, nothing to query
        if not order.sumup_checkout_id:
            return redirect(url_for("orders.order.order_detail", order_id=order.id))

        try:
            await check_sumup_status(g.s, order)
        except Exception:
            # In a real app, log the error; here we just fall back to previous status
            pass

        return redirect(url_for("orders.order.order_detail", order_id=order.id))


    return bp

