"""
Cart service s-expression page components.

Thin Python wrappers for header/layout helpers and route-level render
functions.  All visual rendering logic lives in .sx defcomps.
"""
from __future__ import annotations

import os
from typing import Any
from markupsafe import escape

from shared.sx.jinja_bridge import load_service_components
from shared.sx.helpers import (
    call_url, root_header_sx, post_admin_header_sx,
    post_header_sx as _shared_post_header_sx,
    search_desktop_sx, search_mobile_sx,
    full_page_sx, oob_page_sx, header_child_sx,
    render_to_sx,
)
from shared.sx.parser import SxExpr
from shared.infrastructure.urls import cart_url

# Load cart-specific .sx components + handlers at import time
load_service_components(os.path.dirname(os.path.dirname(__file__)),
                        service_name="cart")


# ---------------------------------------------------------------------------
# Header helpers (used by layouts in sxc/pages/__init__.py)
# ---------------------------------------------------------------------------

def _ensure_post_ctx(ctx: dict, page_post: Any) -> dict:
    """Ensure ctx has a 'post' dict from page_post DTO (for shared post_header_sx)."""
    if ctx.get("post") or not page_post:
        return ctx
    ctx = {**ctx, "post": {
        "id": getattr(page_post, "id", None),
        "slug": getattr(page_post, "slug", ""),
        "title": getattr(page_post, "title", ""),
        "feature_image": getattr(page_post, "feature_image", None),
    }}
    return ctx


async def _ensure_container_nav(ctx: dict) -> dict:
    """Fetch container_nav if not already present (for post header row)."""
    if ctx.get("container_nav"):
        return ctx
    post = ctx.get("post") or {}
    post_id = post.get("id")
    slug = post.get("slug", "")
    if not post_id:
        return ctx
    from shared.infrastructure.fragments import fetch_fragments
    nav_params = {
        "container_type": "page",
        "container_id": str(post_id),
        "post_slug": slug,
    }
    events_nav, market_nav = await fetch_fragments([
        ("events", "container-nav", nav_params),
        ("market", "container-nav", nav_params),
    ], required=False)
    return {**ctx, "container_nav": events_nav + market_nav}


async def _post_header_sx(ctx: dict, page_post: Any, *, oob: bool = False) -> str:
    """Build post-level header row from page_post DTO, using shared helper."""
    ctx = _ensure_post_ctx(ctx, page_post)
    ctx = await _ensure_container_nav(ctx)
    return await _shared_post_header_sx(ctx, oob=oob)


async def _cart_header_sx(ctx: dict, *, oob: bool = False) -> str:
    """Build the cart section header row."""
    return await render_to_sx(
        "menu-row-sx",
        id="cart-row", level=1, colour="sky",
        link_href=call_url(ctx, "cart_url", "/"),
        link_label="cart", icon="fa fa-shopping-cart",
        child_id="cart-header-child", oob=oob,
    )


async def _page_cart_header_sx(ctx: dict, page_post: Any, *, oob: bool = False) -> str:
    """Build the per-page cart header row."""
    slug = page_post.slug if page_post else ""
    title = ((page_post.title if page_post else None) or "")[:160]
    label_parts = []
    if page_post and page_post.feature_image:
        label_parts.append(await render_to_sx("cart-page-label-img", src=page_post.feature_image))
    label_parts.append(f'(span "{escape(title)}")')
    label_sx = "(<> " + " ".join(label_parts) + ")"
    nav_sx = await render_to_sx("cart-all-carts-link", href=call_url(ctx, "cart_url", "/"))
    return await render_to_sx(
        "menu-row-sx",
        id="page-cart-row", level=2, colour="sky",
        link_href=call_url(ctx, "cart_url", f"/{slug}/"),
        link_label_content=SxExpr(label_sx),
        nav=SxExpr(nav_sx), oob=oob,
    )


async def _auth_header_sx(ctx: dict, *, oob: bool = False) -> str:
    """Build the account section header row (for orders)."""
    return await render_to_sx(
        "auth-header-row-simple",
        account_url=call_url(ctx, "account_url", ""),
        oob=oob,
    )


async def _orders_header_sx(ctx: dict, list_url: str) -> str:
    """Build the orders section header row."""
    return await render_to_sx("orders-header-row", list_url=list_url)


async def _cart_page_admin_header_sx(ctx: dict, page_post: Any, *, oob: bool = False,
                                  selected: str = "") -> str:
    """Build the page-level admin header row."""
    slug = page_post.slug if page_post else ""
    ctx = _ensure_post_ctx(ctx, page_post)
    return await post_admin_header_sx(ctx, slug, oob=oob, selected=selected)


# ---------------------------------------------------------------------------
# Serialization helpers (shared with sxc/pages/__init__.py)
# ---------------------------------------------------------------------------

def _serialize_order(order: Any) -> dict:
    """Serialize an order for SX defcomps."""
    from shared.infrastructure.urls import market_product_url
    created = order.created_at.strftime("%-d %b %Y, %H:%M") if order.created_at else "\u2014"
    items = []
    if order.items:
        for item in order.items:
            items.append({
                "product_image": item.product_image,
                "product_title": item.product_title or "Unknown product",
                "product_id": item.product_id,
                "product_slug": item.product_slug,
                "product_url": market_product_url(item.product_slug),
                "quantity": item.quantity,
                "unit_price_formatted": f"{item.unit_price or 0:.2f}",
                "currency": item.currency or order.currency or "GBP",
            })
    return {
        "id": order.id,
        "status": order.status or "pending",
        "created_at_formatted": created,
        "description": order.description or "",
        "total_formatted": f"{order.total_amount or 0:.2f}",
        "total_amount": float(order.total_amount or 0),
        "currency": order.currency or "GBP",
        "items": items,
    }


def _serialize_calendar_entry(e: Any) -> dict:
    """Serialize an order calendar entry for SX defcomps."""
    st = e.state or ""
    ds = e.start_at.strftime("%-d %b %Y, %H:%M") if e.start_at else ""
    if e.end_at:
        ds += f" \u2013 {e.end_at.strftime('%-d %b %Y, %H:%M')}"
    return {
        "name": e.name,
        "state": st,
        "date_str": ds,
        "cost_formatted": f"{e.cost or 0:.2f}",
    }


# ---------------------------------------------------------------------------
# Public API: Orders list (used by cart/bp/orders/routes.py)
# ---------------------------------------------------------------------------

async def render_orders_page(ctx: dict, orders: list, page: int,
                              total_pages: int, search: str | None,
                              search_count: int, url_for_fn: Any,
                              qs_fn: Any) -> str:
    """Full page: orders list."""
    from shared.utils import route_prefix

    ctx["search"] = search
    ctx["search_count"] = search_count
    pfx = route_prefix()
    list_url = pfx + url_for_fn("orders.list_orders")
    rows_url = list_url
    detail_url_prefix = pfx + url_for_fn("orders.order.order_detail", order_id=0).rsplit("0/", 1)[0]

    order_dicts = [_serialize_order(o) for o in orders]
    content = await render_to_sx("orders-list-content",
        orders=order_dicts,
        page=page, total_pages=total_pages,
        rows_url=rows_url, detail_url_prefix=detail_url_prefix)

    hdr = await root_header_sx(ctx)
    auth = await _auth_header_sx(ctx)
    orders_hdr = await _orders_header_sx(ctx, list_url)
    auth_child_inner = await render_to_sx("header-child-sx", id="auth-header-child", inner=SxExpr(orders_hdr))
    auth_child = await render_to_sx(
        "header-child-sx",
        inner=SxExpr("(<> " + auth + " " + auth_child_inner + ")"),
    )
    header_rows = "(<> " + hdr + " " + auth_child + ")"

    filt = await render_to_sx("order-list-header", search_mobile=SxExpr(await search_mobile_sx(ctx)))
    return await full_page_sx(ctx, header_rows=header_rows,
                          filter=filt,
                          aside=await search_desktop_sx(ctx),
                          content=content)


async def render_orders_rows(ctx: dict, orders: list, page: int,
                              total_pages: int, url_for_fn: Any,
                              qs_fn: Any) -> str:
    """Pagination: just the table rows."""
    from shared.utils import route_prefix

    pfx = route_prefix()
    list_url = pfx + url_for_fn("orders.list_orders")
    detail_url_prefix = pfx + url_for_fn("orders.order.order_detail", order_id=0).rsplit("0/", 1)[0]

    order_dicts = [_serialize_order(o) for o in orders]
    parts = []
    for od in order_dicts:
        parts.append(await render_to_sx("order-row-pair",
                     order=od,
                     detail_url_prefix=detail_url_prefix))

    if page < total_pages:
        next_url = list_url + qs_fn(page=page + 1)
        parts.append(await render_to_sx(
            "infinite-scroll",
            url=next_url, page=page, total_pages=total_pages,
            id_prefix="orders", colspan=5,
        ))
    else:
        parts.append(await render_to_sx("order-end-row"))

    return "(<> " + " ".join(parts) + ")"


async def render_orders_oob(ctx: dict, orders: list, page: int,
                             total_pages: int, search: str | None,
                             search_count: int, url_for_fn: Any,
                             qs_fn: Any) -> str:
    """OOB response for orders list."""
    from shared.utils import route_prefix

    ctx["search"] = search
    ctx["search_count"] = search_count
    pfx = route_prefix()
    list_url = pfx + url_for_fn("orders.list_orders")
    rows_url = list_url
    detail_url_prefix = pfx + url_for_fn("orders.order.order_detail", order_id=0).rsplit("0/", 1)[0]

    order_dicts = [_serialize_order(o) for o in orders]
    content = await render_to_sx("orders-list-content",
        orders=order_dicts,
        page=page, total_pages=total_pages,
        rows_url=rows_url, detail_url_prefix=detail_url_prefix)

    auth_oob = await _auth_header_sx(ctx, oob=True)
    orders_hdr = await _orders_header_sx(ctx, list_url)
    auth_child_oob = await render_to_sx(
        "oob-header-sx",
        parent_id="auth-header-child",
        row=SxExpr(orders_hdr),
    )
    root_oob = await root_header_sx(ctx, oob=True)
    oobs = "(<> " + auth_oob + " " + auth_child_oob + " " + root_oob + ")"

    filt = await render_to_sx("order-list-header", search_mobile=SxExpr(await search_mobile_sx(ctx)))
    return await oob_page_sx(oobs=oobs,
                         filter=filt,
                         aside=await search_desktop_sx(ctx),
                         content=content)


# ---------------------------------------------------------------------------
# Public API: Single order detail (used by cart/bp/order/routes.py)
# ---------------------------------------------------------------------------

async def render_order_page(ctx: dict, order: Any,
                             calendar_entries: list | None,
                             url_for_fn: Any) -> str:
    """Full page: single order detail."""
    from shared.utils import route_prefix
    from shared.browser.app.csrf import generate_csrf_token

    pfx = route_prefix()
    detail_url = pfx + url_for_fn("orders.order.order_detail", order_id=order.id)
    list_url = pfx + url_for_fn("orders.list_orders")
    recheck_url = pfx + url_for_fn("orders.order.order_recheck", order_id=order.id)
    pay_url = pfx + url_for_fn("orders.order.order_pay", order_id=order.id)

    order_data = _serialize_order(order)
    cal_data = [_serialize_calendar_entry(e) for e in (calendar_entries or [])]

    main = await render_to_sx("order-detail-content",
        order=order_data,
        calendar_entries=cal_data)
    filt = await render_to_sx("order-detail-filter-content",
        order=order_data,
        list_url=list_url, recheck_url=recheck_url,
        pay_url=pay_url, csrf=generate_csrf_token())

    hdr = await root_header_sx(ctx)
    order_row = await render_to_sx(
        "menu-row-sx",
        id="order-row", level=3, colour="sky",
        link_href=detail_url, link_label=f"Order {order.id}", icon="fa fa-gbp",
    )
    auth = await _auth_header_sx(ctx)
    orders_hdr = await _orders_header_sx(ctx, list_url)
    orders_child = await render_to_sx("header-child-sx", id="orders-header-child", inner=SxExpr(order_row))
    auth_inner = "(<> " + orders_hdr + " " + orders_child + ")"
    auth_child = await render_to_sx("header-child-sx", id="auth-header-child", inner=SxExpr(auth_inner))
    order_child = await render_to_sx(
        "header-child-sx",
        inner=SxExpr("(<> " + auth + " " + auth_child + ")"),
    )
    header_rows = "(<> " + hdr + " " + order_child + ")"

    return await full_page_sx(ctx, header_rows=header_rows, filter=filt, content=main)


async def render_order_oob(ctx: dict, order: Any,
                            calendar_entries: list | None,
                            url_for_fn: Any) -> str:
    """OOB response for single order detail."""
    from shared.utils import route_prefix
    from shared.browser.app.csrf import generate_csrf_token

    pfx = route_prefix()
    detail_url = pfx + url_for_fn("orders.order.order_detail", order_id=order.id)
    list_url = pfx + url_for_fn("orders.list_orders")
    recheck_url = pfx + url_for_fn("orders.order.order_recheck", order_id=order.id)
    pay_url = pfx + url_for_fn("orders.order.order_pay", order_id=order.id)

    order_data = _serialize_order(order)
    cal_data = [_serialize_calendar_entry(e) for e in (calendar_entries or [])]

    main = await render_to_sx("order-detail-content",
        order=order_data,
        calendar_entries=cal_data)
    filt = await render_to_sx("order-detail-filter-content",
        order=order_data,
        list_url=list_url, recheck_url=recheck_url,
        pay_url=pay_url, csrf=generate_csrf_token())

    order_row_oob = await render_to_sx(
        "menu-row-sx",
        id="order-row", level=3, colour="sky",
        link_href=detail_url, link_label=f"Order {order.id}", icon="fa fa-gbp",
        oob=True,
    )
    orders_child_oob = await render_to_sx("oob-header-sx",
                                  parent_id="orders-header-child",
                                  row=SxExpr(order_row_oob))
    root_oob = await root_header_sx(ctx, oob=True)
    oobs = "(<> " + orders_child_oob + " " + root_oob + ")"

    return await oob_page_sx(oobs=oobs, filter=filt, content=main)


# ---------------------------------------------------------------------------
# Public API: Checkout error (used by cart/bp/cart routes + order routes)
# ---------------------------------------------------------------------------

async def render_checkout_error_page(ctx: dict, error: str | None = None,
                                      order: Any | None = None) -> str:
    """Full page: checkout error."""
    err_msg = error or "Unexpected error while creating the hosted checkout session."
    order_sx = None
    if order:
        order_sx = await render_to_sx("checkout-error-order-id", oid=f"#{order.id}")
    back_url = cart_url("/")

    hdr = await root_header_sx(ctx)
    filt = await render_to_sx("checkout-error-header")
    content = await render_to_sx(
        "checkout-error-content",
        msg=err_msg,
        order=SxExpr(order_sx) if order_sx else None,
        back_url=back_url,
    )
    return await full_page_sx(ctx, header_rows=hdr, filter=filt, content=content)


# ---------------------------------------------------------------------------
# Public API: POST response renderers
# ---------------------------------------------------------------------------

async def render_cart_payments_panel(ctx: dict) -> str:
    """Render the payments config panel for PUT response."""
    page_config = ctx.get("page_config")
    pc_data = None
    if page_config:
        pc_data = {
            "sumup_api_key": bool(getattr(page_config, "sumup_api_key", None)),
            "sumup_merchant_code": getattr(page_config, "sumup_merchant_code", None) or "",
            "sumup_checkout_prefix": getattr(page_config, "sumup_checkout_prefix", None) or "",
        }
    return await render_to_sx("cart-payments-content",
        page_config=pc_data)