"""
Orders service s-expression page components.

Each function renders a complete page section (full page, OOB, or pagination)
using shared s-expression components.  Called from route handlers in place
of ``render_template()``.
"""
from __future__ import annotations

import os
from typing import Any

from shared.sexp.jinja_bridge import render, load_service_components
from shared.sexp.helpers import (
    call_url, get_asset_url, root_header_html,
    search_mobile_html, search_desktop_html, full_page, oob_page,
)
from shared.infrastructure.urls import market_product_url, cart_url

# Load orders-specific .sexpr components at import time
load_service_components(os.path.dirname(os.path.dirname(__file__)))


# ---------------------------------------------------------------------------
# Header helpers (shared auth + orders-specific)
# ---------------------------------------------------------------------------

def _auth_nav_html(ctx: dict) -> str:
    """Auth section desktop nav items."""
    html = render(
        "nav-link",
        href=call_url(ctx, "account_url", "/newsletters/"),
        label="newsletters",
        select_colours=ctx.get("select_colours", ""),
    )
    account_nav_html = ctx.get("account_nav_html", "")
    if account_nav_html:
        html += account_nav_html
    return html


def _auth_header_html(ctx: dict, *, oob: bool = False) -> str:
    """Build the account section header row."""
    return render(
        "menu-row",
        id="auth-row", level=1, colour="sky",
        link_href=call_url(ctx, "account_url", "/"),
        link_label="account", icon="fa-solid fa-user",
        nav_html=_auth_nav_html(ctx),
        child_id="auth-header-child", oob=oob,
    )


def _orders_header_html(ctx: dict, list_url: str) -> str:
    """Build the orders section header row."""
    return render(
        "menu-row",
        id="orders-row", level=2, colour="sky",
        link_href=list_url, link_label="Orders", icon="fa fa-gbp",
        child_id="orders-header-child",
    )


# ---------------------------------------------------------------------------
# Orders list rendering
# ---------------------------------------------------------------------------

def _status_pill_cls(status: str) -> str:
    """Return Tailwind classes for order status pill."""
    sl = status.lower()
    if sl == "paid":
        return "border-emerald-300 bg-emerald-50 text-emerald-700"
    if sl in ("failed", "cancelled"):
        return "border-rose-300 bg-rose-50 text-rose-700"
    return "border-stone-300 bg-stone-50 text-stone-700"


def _order_row_html(order: Any, detail_url: str) -> str:
    """Render a single order as desktop table row + mobile card."""
    status = order.status or "pending"
    pill = _status_pill_cls(status)
    created = order.created_at.strftime("%-d %b %Y, %H:%M") if order.created_at else "\u2014"
    total = f"{order.currency or 'GBP'} {order.total_amount or 0:.2f}"

    desktop = render(
        "orders-row-desktop",
        oid=f"#{order.id}", created=created,
        desc=order.description or "", total=total,
        pill=f"inline-flex items-center rounded-full border px-2 py-0.5 text-[11px] sm:text-xs {pill}",
        status=status, url=detail_url,
    )

    mobile = render(
        "orders-row-mobile",
        oid=f"#{order.id}", created=created, total=total,
        pill=f"inline-flex items-center rounded-full border px-2 py-0.5 text-[11px] {pill}",
        status=status, url=detail_url,
    )

    return desktop + mobile


def _orders_rows_html(orders: list, page: int, total_pages: int,
                      url_for_fn: Any, qs_fn: Any) -> str:
    """Render order rows + infinite scroll sentinel."""
    from shared.utils import route_prefix
    pfx = route_prefix()

    parts = [
        _order_row_html(o, pfx + url_for_fn("orders.order.order_detail", order_id=o.id))
        for o in orders
    ]

    if page < total_pages:
        next_url = pfx + url_for_fn("orders.list_orders") + qs_fn(page=page + 1)
        parts.append(render(
            "infinite-scroll",
            url=next_url, page=page, total_pages=total_pages, id_prefix="orders", colspan=5,
        ))
    else:
        parts.append(render("orders-end-row"))

    return "".join(parts)


def _orders_main_panel_html(orders: list, rows_html: str) -> str:
    """Main panel with table or empty state."""
    if not orders:
        return render("orders-empty-state")
    return render("orders-table", rows_html=rows_html)


def _orders_summary_html(ctx: dict) -> str:
    """Filter section for orders list."""
    return render("orders-summary", search_mobile_html=search_mobile_html(ctx))


# ---------------------------------------------------------------------------
# Public API: orders list
# ---------------------------------------------------------------------------

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
    list_url = route_prefix() + url_for_fn("orders.list_orders")

    rows = _orders_rows_html(orders, page, total_pages, url_for_fn, qs_fn)
    main = _orders_main_panel_html(orders, rows)

    hdr = root_header_html(ctx)
    hdr += render(
        "orders-header-child",
        inner_html=_auth_header_html(ctx) + _orders_header_html(ctx, list_url),
    )

    return full_page(ctx, header_rows_html=hdr,
                     filter_html=_orders_summary_html(ctx),
                     aside_html=search_desktop_html(ctx),
                     content_html=main)


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."""
    return _orders_rows_html(orders, page, total_pages, url_for_fn, qs_fn)


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 HTMX navigation to orders list."""
    from shared.utils import route_prefix

    ctx["search"] = search
    ctx["search_count"] = search_count
    list_url = route_prefix() + url_for_fn("orders.list_orders")

    rows = _orders_rows_html(orders, page, total_pages, url_for_fn, qs_fn)
    main = _orders_main_panel_html(orders, rows)

    oobs = (
        _auth_header_html(ctx, oob=True)
        + render(
            "orders-auth-header-child-oob",
            inner_html=_orders_header_html(ctx, list_url),
        )
        + root_header_html(ctx, oob=True)
    )

    return oob_page(ctx, oobs_html=oobs,
                    filter_html=_orders_summary_html(ctx),
                    aside_html=search_desktop_html(ctx),
                    content_html=main)


# ---------------------------------------------------------------------------
# Single order detail
# ---------------------------------------------------------------------------

def _order_items_html(order: Any) -> str:
    """Render order items list."""
    if not order or not order.items:
        return ""
    items = []
    for item in order.items:
        prod_url = market_product_url(item.product_slug)
        if item.product_image:
            img = render(
                "orders-item-image",
                src=item.product_image, alt=item.product_title or "Product image",
            )
        else:
            img = render("orders-item-no-image")

        items.append(render(
            "orders-item-row",
            href=prod_url, img_html=img,
            title=item.product_title or "Unknown product",
            pid=str(item.product_id),
            qty=str(item.quantity),
            price=f"{item.currency or order.currency or 'GBP'} {item.unit_price or 0:.2f}",
        ))

    return render("orders-items-section", items_html="".join(items))


def _calendar_items_html(calendar_entries: list | None) -> str:
    """Render calendar bookings for an order."""
    if not calendar_entries:
        return ""
    items = []
    for e in calendar_entries:
        st = e.state or ""
        pill = (
            "bg-emerald-100 text-emerald-800" if st == "confirmed"
            else "bg-amber-100 text-amber-800" if st == "provisional"
            else "bg-blue-100 text-blue-800" if st == "ordered"
            else "bg-stone-100 text-stone-700"
        )
        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')}"
        items.append(render(
            "orders-calendar-item",
            name=e.name,
            pill=f"inline-flex items-center rounded-full px-2 py-0.5 text-[11px] font-medium {pill}",
            state=st.capitalize(), ds=ds,
            cost=f"\u00a3{e.cost or 0:.2f}",
        ))

    return render("orders-calendar-section", items_html="".join(items))


def _order_main_html(order: Any, calendar_entries: list | None) -> str:
    """Main panel for single order detail."""
    summary = render(
        "order-summary-card",
        order_id=order.id,
        created_at=order.created_at.strftime("%-d %b %Y, %H:%M") if order.created_at else None,
        description=order.description, status=order.status, currency=order.currency,
        total_amount=f"{order.total_amount:.2f}" if order.total_amount else None,
    )
    return render(
        "orders-detail-panel",
        summary_html=summary, items_html=_order_items_html(order),
        calendar_html=_calendar_items_html(calendar_entries),
    )


def _order_filter_html(order: Any, list_url: str, recheck_url: str,
                       pay_url: str, csrf_token: str) -> str:
    """Filter section for single order detail."""
    created = order.created_at.strftime("%-d %b %Y, %H:%M") if order.created_at else "\u2014"
    status = order.status or "pending"

    pay_html = ""
    if status != "paid":
        pay_html = render("orders-checkout-error-pay-btn", url=pay_url)

    return render(
        "orders-detail-filter",
        created=created, status=status,
        list_url=list_url, recheck_url=recheck_url,
        csrf=csrf_token, pay_html=pay_html,
    )


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)

    main = _order_main_html(order, calendar_entries)
    filt = _order_filter_html(order, list_url, recheck_url, pay_url, generate_csrf_token())

    # Header stack: root -> auth -> orders -> order
    hdr = root_header_html(ctx)
    order_row = render(
        "menu-row",
        id="order-row", level=3, colour="sky", link_href=detail_url,
        link_label="Order", icon="fa fa-gbp",
    )
    hdr += render(
        "orders-detail-header-stack",
        auth_html=_auth_header_html(ctx),
        orders_html=_orders_header_html(ctx, list_url),
        order_html=order_row,
    )

    return full_page(ctx, header_rows_html=hdr, filter_html=filt, content_html=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)

    main = _order_main_html(order, calendar_entries)
    filt = _order_filter_html(order, list_url, recheck_url, pay_url, generate_csrf_token())

    order_row_oob = render(
        "menu-row",
        id="order-row", level=3, colour="sky", link_href=detail_url,
        link_label="Order", icon="fa fa-gbp", oob=True,
    )
    oobs = (
        render("orders-header-child-oob", inner_html=order_row_oob)
        + root_header_html(ctx, oob=True)
    )

    return oob_page(ctx, oobs_html=oobs, filter_html=filt, content_html=main)


# ---------------------------------------------------------------------------
# Public API: Checkout error
# ---------------------------------------------------------------------------

def _checkout_error_filter_html() -> str:
    return render("orders-checkout-error-header")


def _checkout_error_content_html(error: str | None, order: Any | None) -> str:
    err_msg = error or "Unexpected error while creating the hosted checkout session."
    order_html = ""
    if order:
        order_html = render("orders-checkout-error-order-id", oid=f"#{order.id}")
    back_url = cart_url("/")
    return render(
        "orders-checkout-error-content",
        msg=err_msg, order_html=order_html, back_url=back_url,
    )


async def render_checkout_error_page(ctx: dict, error: str | None = None, order: Any | None = None) -> str:
    """Full page: checkout error."""
    hdr = root_header_html(ctx)
    hdr += render(
        "orders-header-child",
        inner_html=_auth_header_html(ctx),
    )
    filt = _checkout_error_filter_html()
    content = _checkout_error_content_html(error, order)
    return full_page(ctx, header_rows_html=hdr, filter_html=filt, content_html=content)