"""Blog app fragment endpoints.

Exposes sx fragments at ``/internal/fragments/<type>`` for consumption
by other coop apps via the fragment client.
"""

from __future__ import annotations

from quart import Blueprint, Response, g, render_template, request

from shared.infrastructure.fragments import FRAGMENT_HEADER
from shared.services.navigation import get_navigation_tree


def register():
    bp = Blueprint("fragments", __name__, url_prefix="/internal/fragments")

    _handlers: dict[str, object] = {}

    @bp.before_request
    async def _require_fragment_header():
        if not request.headers.get(FRAGMENT_HEADER):
            return Response("", status=403)

    @bp.get("/<fragment_type>")
    async def get_fragment(fragment_type: str):
        handler = _handlers.get(fragment_type)
        if handler is None:
            return Response("", status=200, content_type="text/sx")
        result = await handler()
        return Response(result, status=200, content_type="text/sx")

    # --- nav-tree fragment — returns sx source ---
    async def _nav_tree_handler():
        from shared.sx.helpers import sx_call, SxExpr
        from shared.infrastructure.urls import (
            blog_url, cart_url, market_url, events_url,
            federation_url, account_url, artdag_url,
        )

        app_name = request.args.get("app_name", "")
        path = request.args.get("path", "/")
        first_seg = path.strip("/").split("/")[0]
        menu_items = list(await get_navigation_tree(g.s))

        app_slugs = {
            "cart": cart_url("/"),
            "market": market_url("/"),
            "events": events_url("/"),
            "federation": federation_url("/"),
            "account": account_url("/"),
            "artdag": artdag_url("/"),
        }

        nav_cls = "whitespace-nowrap flex items-center gap-2 rounded p-2 text-sm"

        item_sxs = []
        for item in menu_items:
            href = app_slugs.get(item.slug, blog_url(f"/{item.slug}/"))
            selected = "true" if (item.slug == first_seg
                                  or item.slug == app_name) else "false"
            img = sx_call("blog-nav-item-image",
                            src=getattr(item, "feature_image", None),
                            label=getattr(item, "label", item.slug))
            item_sxs.append(sx_call(
                "blog-nav-item-link",
                href=href, hx_get=href, selected=selected, nav_cls=nav_cls,
                img=SxExpr(img), label=getattr(item, "label", item.slug),
            ))

        # artdag link
        href = artdag_url("/")
        selected = "true" if ("artdag" == first_seg
                              or "artdag" == app_name) else "false"
        img = sx_call("blog-nav-item-image", src=None, label="art-dag")
        item_sxs.append(sx_call(
            "blog-nav-item-link",
            href=href, hx_get=href, selected=selected, nav_cls=nav_cls,
            img=SxExpr(img), label="art-dag",
        ))

        if not item_sxs:
            return sx_call("blog-nav-empty",
                             wrapper_id="menu-items-nav-wrapper")

        items_frag = "(<> " + " ".join(item_sxs) + ")"

        arrow_cls = "scrolling-menu-arrow-menu-items-container"
        container_id = "menu-items-container"
        left_hs = ("on click set #" + container_id
                    + ".scrollLeft to #" + container_id + ".scrollLeft - 200")
        scroll_hs = ("on scroll "
                     "set cls to '" + arrow_cls + "' "
                     "set arrows to document.getElementsByClassName(cls) "
                     "set show to (window.innerWidth >= 640 and "
                     "my.scrollWidth > my.clientWidth) "
                     "repeat for arrow in arrows "
                     "if show remove .hidden from arrow add .flex to arrow "
                     "else add .hidden to arrow remove .flex from arrow end "
                     "end")
        right_hs = ("on click set #" + container_id
                     + ".scrollLeft to #" + container_id + ".scrollLeft + 200")

        return sx_call("blog-nav-wrapper",
                         arrow_cls=arrow_cls,
                         container_id=container_id,
                         left_hs=left_hs,
                         scroll_hs=scroll_hs,
                         right_hs=right_hs,
                         items=SxExpr(items_frag))

    _handlers["nav-tree"] = _nav_tree_handler

    # --- link-card fragment — returns sx source ---
    def _blog_link_card_sx(post, link: str) -> str:
        from shared.sx.helpers import sx_call
        published = post.published_at.strftime("%d %b %Y") if post.published_at else None
        return sx_call("link-card",
                         link=link,
                         title=post.title,
                         image=post.feature_image,
                         icon="fas fa-file-alt",
                         subtitle=post.custom_excerpt or post.excerpt,
                         detail=published,
                         data_app="blog")

    async def _link_card_handler():
        from shared.services.registry import services
        from shared.infrastructure.urls import blog_url

        slug = request.args.get("slug", "")
        keys_raw = request.args.get("keys", "")

        # Batch mode
        if keys_raw:
            slugs = [k.strip() for k in keys_raw.split(",") if k.strip()]
            parts = []
            for s in slugs:
                parts.append(f"<!-- fragment:{s} -->")
                post = await services.blog.get_post_by_slug(g.s, s)
                if post:
                    parts.append(_blog_link_card_sx(post, blog_url(f"/{post.slug}")))
            return "\n".join(parts)

        # Single mode
        if not slug:
            return ""
        post = await services.blog.get_post_by_slug(g.s, slug)
        if not post:
            return ""
        return _blog_link_card_sx(post, blog_url(f"/{post.slug}"))

    _handlers["link-card"] = _link_card_handler

    bp._fragment_handlers = _handlers

    return bp