"""Events 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.infrastructure.data_client import fetch_data
from shared.contracts.dtos import PostDTO, dto_from_dict
from shared.services.registry import services


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

    _handlers: dict[str, object] = {}

    # Fragment types that still return HTML (Jinja templates)
    _html_types = {"container-cards", "account-page"}

    @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()
        ct = "text/html" if fragment_type in _html_types else "text/sx"
        return Response(result, status=200, content_type=ct)

    # --- container-nav fragment: calendar entries + calendar links -----------

    async def _container_nav_handler():
        from quart import current_app
        from shared.infrastructure.urls import events_url
        from shared.sx.helpers import sx_call

        container_type = request.args.get("container_type", "page")
        container_id = int(request.args.get("container_id", 0))
        post_slug = request.args.get("post_slug", "")
        paginate_url_base = request.args.get("paginate_url", "")
        page = int(request.args.get("page", 1))
        exclude = request.args.get("exclude", "")
        excludes = [e.strip() for e in exclude.split(",") if e.strip()]

        styles = current_app.jinja_env.globals.get("styles", {})
        nav_class = styles.get("nav_button_less_pad", "")
        parts = []

        # Calendar entries nav
        if not any(e.startswith("calendar") for e in excludes):
            entries, has_more = await services.calendar.associated_entries(
                g.s, container_type, container_id, page,
            )
            for entry in entries:
                entry_path = (
                    f"/{post_slug}/{entry.calendar_slug}/"
                    f"{entry.start_at.year}/{entry.start_at.month}/"
                    f"{entry.start_at.day}/entries/{entry.id}/"
                )
                date_str = entry.start_at.strftime("%b %d, %Y at %H:%M")
                if entry.end_at:
                    date_str += f" – {entry.end_at.strftime('%H:%M')}"
                parts.append(sx_call("calendar-entry-nav",
                    href=events_url(entry_path), name=entry.name,
                    date_str=date_str, nav_class=nav_class))
            if has_more and paginate_url_base:
                parts.append(sx_call("htmx-sentinel",
                    id=f"entries-load-sentinel-{page}",
                    hx_get=f"{paginate_url_base}?page={page + 1}",
                    hx_trigger="intersect once",
                    hx_swap="beforebegin",
                    **{"class": "flex-shrink-0 w-1"}))

        # Calendar links nav
        if not any(e.startswith("calendar") for e in excludes):
            calendars = await services.calendar.calendars_for_container(
                g.s, container_type, container_id,
            )
            for cal in calendars:
                href = events_url(f"/{post_slug}/{cal.slug}/")
                parts.append(sx_call("calendar-link-nav",
                    href=href, name=cal.name, nav_class=nav_class))

        if not parts:
            return ""
        return "(<> " + " ".join(parts) + ")"

    _handlers["container-nav"] = _container_nav_handler

    # --- container-cards fragment: entries for blog listing cards (still Jinja) --

    async def _container_cards_handler():
        post_ids_raw = request.args.get("post_ids", "")
        post_slugs_raw = request.args.get("post_slugs", "")
        post_ids = [int(x) for x in post_ids_raw.split(",") if x.strip()]
        post_slugs = [x.strip() for x in post_slugs_raw.split(",") if x.strip()]
        if not post_ids:
            return ""

        slug_map = {}
        for i, pid in enumerate(post_ids):
            slug_map[pid] = post_slugs[i] if i < len(post_slugs) else ""

        batch = await services.calendar.confirmed_entries_for_posts(g.s, post_ids)
        return await render_template(
            "fragments/container_cards_entries.html",
            batch=batch, post_ids=post_ids, slug_map=slug_map,
        )

    _handlers["container-cards"] = _container_cards_handler

    # --- account-nav-item fragment: tickets + bookings links -----------------

    async def _account_nav_item_handler():
        from quart import current_app
        from shared.infrastructure.urls import account_url
        from shared.sx.helpers import sx_call

        styles = current_app.jinja_env.globals.get("styles", {})
        nav_class = styles.get("nav_button", "")
        hx_select = (
            "#main-panel, #search-mobile, #search-count-mobile,"
            " #search-desktop, #search-count-desktop, #menu-items-nav-wrapper"
        )
        tickets_url = account_url("/tickets/")
        bookings_url = account_url("/bookings/")
        parts = []
        for href, label in [(tickets_url, "tickets"), (bookings_url, "bookings")]:
            parts.append(sx_call("nav-group-link",
                href=href, hx_select=hx_select, nav_class=nav_class, label=label))
        return "(<> " + " ".join(parts) + ")"

    _handlers["account-nav-item"] = _account_nav_item_handler

    # --- account-page fragment: tickets or bookings panel (still Jinja) ------

    async def _account_page_handler():
        slug = request.args.get("slug", "")
        user_id = request.args.get("user_id", type=int)
        if not user_id:
            return ""

        if slug == "tickets":
            tickets = await services.calendar.user_tickets(g.s, user_id=user_id)
            return await render_template(
                "fragments/account_page_tickets.html",
                tickets=tickets,
            )
        elif slug == "bookings":
            bookings = await services.calendar.user_bookings(g.s, user_id=user_id)
            return await render_template(
                "fragments/account_page_bookings.html",
                bookings=bookings,
            )
        return ""

    _handlers["account-page"] = _account_page_handler

    # --- link-card fragment: event page preview card -------------------------

    async def _link_card_handler():
        from shared.infrastructure.urls import events_url
        from shared.sx.helpers import sx_call

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

        def _event_link_card_sx(post, cal_names: str) -> str:
            return sx_call("link-card",
                             title=post.title, image=post.feature_image,
                             subtitle=cal_names,
                             link=events_url(f"/{post.slug}"))

        # 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} -->")
                raw = await fetch_data("blog", "post-by-slug", params={"slug": s}, required=False)
                post = dto_from_dict(PostDTO, raw) if raw else None
                if post:
                    calendars = await services.calendar.calendars_for_container(
                        g.s, "page", post.id,
                    )
                    cal_names = ", ".join(c.name for c in calendars) if calendars else ""
                    parts.append(_event_link_card_sx(post, cal_names))
            return "\n".join(parts)

        # Single mode
        if not slug:
            return ""
        raw = await fetch_data("blog", "post-by-slug", params={"slug": slug}, required=False)
        post = dto_from_dict(PostDTO, raw) if raw else None
        if not post:
            return ""
        calendars = await services.calendar.calendars_for_container(
            g.s, "page", post.id,
        )
        cal_names = ", ".join(c.name for c in calendars) if calendars else ""
        return _event_link_card_sx(post, cal_names)

    _handlers["link-card"] = _link_card_handler

    bp._fragment_handlers = _handlers

    return bp