"""
Full-page s-expression rendering.

Provides ``render_page()`` for rendering a complete HTML page from an
s-expression, bypassing Jinja entirely.  Used by error handlers and
(eventually) by route handlers for fully-migrated pages.

``render_sx_response()`` is the main entry point for GET route handlers:
it calls the app's context processor, merges in route-specific kwargs,
renders the s-expression to HTML, and returns a Quart ``Response``.

Usage::

    from shared.sx.page import render_page, render_sx_response

    # Error pages (no context needed)
    html = render_page(
        '(~error-page :title "Not Found" :message "NOT FOUND" :image img :asset-url aurl)',
        image="/static/errors/404.gif",
        asset_url="/static",
    )

    # GET route handlers (auto-injects app context)
    resp = await render_sx_response('(~orders-page :orders orders)', orders=orders)
"""

from __future__ import annotations

from typing import Any

from .jinja_bridge import sx

SEARCH_HEADERS_MOBILE = '{"X-Origin":"search-mobile","X-Search":"true"}'
SEARCH_HEADERS_DESKTOP = '{"X-Origin":"search-desktop","X-Search":"true"}'


def render_page(source: str, **kwargs: Any) -> str:
    """Render a full HTML page from an s-expression string.

    This is a thin wrapper around ``sx()`` — it exists to make the
    intent explicit in call sites (rendering a whole page, not a fragment).
    """
    return sx(source, **kwargs)


async def get_template_context(**kwargs: Any) -> dict[str, Any]:
    """Gather the full template context from all registered context processors.

    Returns a dict with all context variables that would normally be
    available in a Jinja template, merged with any extra kwargs.
    """
    import asyncio
    from quart import current_app, request

    ctx: dict[str, Any] = {}

    # App-level context processors
    for proc in current_app.template_context_processors.get(None, []):
        rv = proc()
        if asyncio.iscoroutine(rv):
            rv = await rv
        ctx.update(rv)

    # Blueprint-scoped context processors
    for bp_name in (request.blueprints or []):
        for proc in current_app.template_context_processors.get(bp_name, []):
            rv = proc()
            if asyncio.iscoroutine(rv):
                rv = await rv
            ctx.update(rv)

    # Inject Jinja globals that s-expression components need (URL helpers,
    # asset_url, styles, etc.) — these aren't provided by context processors.
    for key, val in current_app.jinja_env.globals.items():
        if key not in ctx:
            ctx[key] = val

    # Expose request-scoped values that sx components need
    from quart import g
    if "rights" not in ctx:
        ctx["rights"] = getattr(g, "rights", {})

    ctx.update(kwargs)
    return ctx


async def render_sx_response(source: str, **kwargs: Any) -> str:
    """Render an s-expression with the full app template context.

    Calls the app's registered context processors (which provide
    cart_mini, auth_menu, nav_tree, asset_url, etc.)
    and merges them with the caller's kwargs before rendering.

    Returns the rendered HTML string (caller wraps in Response as needed).
    """
    ctx = await get_template_context(**kwargs)
    return sx(source, **ctx)