"""
Shared helper functions for s-expression page rendering.

These are used by per-service sexp_components.py files to build common
page elements (headers, search, etc.) from template context.
"""
from __future__ import annotations

from typing import Any

from markupsafe import escape

from .jinja_bridge import render
from .page import SEARCH_HEADERS_MOBILE, SEARCH_HEADERS_DESKTOP


def call_url(ctx: dict, key: str, path: str = "/") -> str:
    """Call a URL helper from context (e.g., blog_url, account_url)."""
    fn = ctx.get(key)
    if callable(fn):
        return fn(path)
    return str(fn or "") + path


def get_asset_url(ctx: dict) -> str:
    """Extract the asset URL base from context."""
    au = ctx.get("asset_url")
    if callable(au):
        result = au("")
        return result.rsplit("/", 1)[0] if "/" in result else result
    return au or ""


def root_header_html(ctx: dict, *, oob: bool = False) -> str:
    """Build the root header row HTML."""
    return render(
        "header-row",
        cart_mini_html=ctx.get("cart_mini_html", ""),
        blog_url=call_url(ctx, "blog_url", ""),
        site_title=ctx.get("base_title", ""),
        app_label=ctx.get("app_label", ""),
        nav_tree_html=ctx.get("nav_tree_html", ""),
        auth_menu_html=ctx.get("auth_menu_html", ""),
        nav_panel_html=ctx.get("nav_panel_html", ""),
        oob=oob,
    )


def search_mobile_html(ctx: dict) -> str:
    """Build mobile search input HTML."""
    return render(
        "search-mobile",
        current_local_href=ctx.get("current_local_href", "/"),
        search=ctx.get("search", ""),
        search_count=ctx.get("search_count", ""),
        hx_select=ctx.get("hx_select", "#main-panel"),
        search_headers_mobile=SEARCH_HEADERS_MOBILE,
    )


def search_desktop_html(ctx: dict) -> str:
    """Build desktop search input HTML."""
    return render(
        "search-desktop",
        current_local_href=ctx.get("current_local_href", "/"),
        search=ctx.get("search", ""),
        search_count=ctx.get("search_count", ""),
        hx_select=ctx.get("hx_select", "#main-panel"),
        search_headers_desktop=SEARCH_HEADERS_DESKTOP,
    )


def post_header_html(ctx: dict, *, oob: bool = False) -> str:
    """Build the post-level header row (level 1). Used by all apps + error pages."""
    post = ctx.get("post") or {}
    slug = post.get("slug", "")
    if not slug:
        return ""
    title = (post.get("title") or "")[:160]
    feature_image = post.get("feature_image")

    label_html = render("post-label", feature_image=feature_image, title=title)

    nav_parts: list[str] = []
    page_cart_count = ctx.get("page_cart_count", 0)
    if page_cart_count and page_cart_count > 0:
        cart_href = call_url(ctx, "cart_url", f"/{slug}/")
        nav_parts.append(render("page-cart-badge", href=cart_href, count=str(page_cart_count)))

    container_nav = ctx.get("container_nav_html", "")
    if container_nav:
        nav_parts.append(container_nav)

    admin_nav = ctx.get("post_admin_nav_html", "")
    if admin_nav:
        nav_parts.append(admin_nav)

    nav_html = "".join(nav_parts)
    link_href = call_url(ctx, "blog_url", f"/{slug}/")

    return render("menu-row",
        id="post-row", level=1,
        link_href=link_href, link_label_html=label_html,
        nav_html=nav_html, child_id="post-header-child",
        oob=oob, external=True,
    )


def post_admin_header_html(ctx: dict, slug: str, *, oob: bool = False,
                           selected: str = "", admin_href: str = "") -> str:
    """Shared post admin header row with unified nav across all services.

    Shows: calendars | markets | payments | entries | data | edit | settings
    All links are external (cross-service).  The *selected* item is
    highlighted on the nav and shown in white next to the admin label.
    """
    # Label: shield icon + "admin" + optional selected sub-page in white
    label_html = '<i class="fa fa-shield-halved" aria-hidden="true"></i> admin'
    if selected:
        label_html += f' <span class="text-white">{escape(selected)}</span>'

    # Nav items — all external links to the appropriate service
    select_colours = ctx.get("select_colours", "")
    base_cls = ("justify-center cursor-pointer flex flex-row items-center"
                " gap-2 rounded bg-stone-200 text-black p-3")
    selected_cls = ("justify-center cursor-pointer flex flex-row items-center"
                    " gap-2 rounded !bg-stone-500 !text-white p-3")
    nav_parts: list[str] = []
    items = [
        ("events_url", f"/{slug}/admin/", "calendars"),
        ("market_url", f"/{slug}/admin/", "markets"),
        ("cart_url",   f"/{slug}/admin/payments/", "payments"),
        ("blog_url",   f"/{slug}/admin/entries/", "entries"),
        ("blog_url",   f"/{slug}/admin/data/", "data"),
        ("blog_url",   f"/{slug}/admin/edit/", "edit"),
        ("blog_url",   f"/{slug}/admin/settings/", "settings"),
    ]
    for url_key, path, label in items:
        url_fn = ctx.get(url_key)
        if not callable(url_fn):
            continue
        href = url_fn(path)
        is_sel = label == selected
        cls = selected_cls if is_sel else base_cls
        aria = ' aria-selected="true"' if is_sel else ""
        nav_parts.append(
            f'<div class="relative nav-group">'
            f'<a href="{escape(href)}"{aria}'
            f' class="{cls} {escape(select_colours)}">'
            f'{escape(label)}</a></div>'
        )
    nav_html = "".join(nav_parts)

    if not admin_href:
        blog_fn = ctx.get("blog_url")
        admin_href = blog_fn(f"/{slug}/admin/") if callable(blog_fn) else f"/{slug}/admin/"

    return render("menu-row",
        id="post-admin-row", level=2,
        link_href=admin_href, link_label_html=label_html,
        nav_html=nav_html, child_id="post-admin-header-child", oob=oob,
    )


def oob_header_html(parent_id: str, child_id: str, row_html: str) -> str:
    """Wrap a header row in an OOB swap div with child placeholder."""
    return render("oob-header",
        parent_id=parent_id, child_id=child_id, row_html=row_html,
    )


def header_child_html(inner_html: str, *, id: str = "root-header-child") -> str:
    """Wrap inner HTML in a header-child div."""
    return render("header-child", id=id, inner_html=inner_html)


def error_content_html(errnum: str, message: str, image: str | None = None) -> str:
    """Render the error content block."""
    return render("error-content", errnum=errnum, message=message, image=image)


def full_page(ctx: dict, *, header_rows_html: str,
              filter_html: str = "", aside_html: str = "",
              content_html: str = "", menu_html: str = "",
              body_end_html: str = "", meta_html: str = "") -> str:
    """Render a full app page with the standard layout."""
    return render(
        "app-layout",
        title=ctx.get("base_title", "Rose Ash"),
        asset_url=get_asset_url(ctx),
        meta_html=meta_html,
        header_rows_html=header_rows_html,
        menu_html=menu_html,
        filter_html=filter_html,
        aside_html=aside_html,
        content_html=content_html,
        body_end_html=body_end_html,
    )


def oob_page(ctx: dict, *, oobs_html: str = "",
             filter_html: str = "", aside_html: str = "",
             content_html: str = "", menu_html: str = "") -> str:
    """Render an OOB response with standard swap targets."""
    return render(
        "oob-response",
        oobs_html=oobs_html,
        filter_html=filter_html,
        aside_html=aside_html,
        menu_html=menu_html,
        content_html=content_html,
    )