"""Blog app data endpoints.

Exposes read-only JSON queries at ``/internal/data/<query_name>`` for
cross-app callers via the internal data client.
"""
from __future__ import annotations

from quart import Blueprint, g, jsonify, request

from shared.infrastructure.data_client import DATA_HEADER
from shared.contracts.dtos import dto_to_dict
from shared.services.registry import services


def register() -> Blueprint:
    bp = Blueprint("data", __name__, url_prefix="/internal/data")

    @bp.before_request
    async def _require_data_header():
        if not request.headers.get(DATA_HEADER):
            return jsonify({"error": "forbidden"}), 403

    _handlers: dict[str, object] = {}

    @bp.get("/<query_name>")
    async def handle_query(query_name: str):
        handler = _handlers.get(query_name)
        if handler is None:
            return jsonify({"error": "unknown query"}), 404
        result = await handler()
        return jsonify(result)

    # --- post-by-slug ---
    async def _post_by_slug():
        slug = request.args.get("slug", "")
        post = await services.blog.get_post_by_slug(g.s, slug)
        if not post:
            return None
        return dto_to_dict(post)

    _handlers["post-by-slug"] = _post_by_slug

    # --- post-by-id ---
    async def _post_by_id():
        post_id = int(request.args.get("id", 0))
        post = await services.blog.get_post_by_id(g.s, post_id)
        if not post:
            return None
        return dto_to_dict(post)

    _handlers["post-by-id"] = _post_by_id

    # --- posts-by-ids ---
    async def _posts_by_ids():
        ids_raw = request.args.get("ids", "")
        if not ids_raw:
            return []
        ids = [int(x.strip()) for x in ids_raw.split(",") if x.strip()]
        posts = await services.blog.get_posts_by_ids(g.s, ids)
        return [dto_to_dict(p) for p in posts]

    _handlers["posts-by-ids"] = _posts_by_ids

    # --- search-posts ---
    async def _search_posts():
        query = request.args.get("query", "")
        page = int(request.args.get("page", 1))
        per_page = int(request.args.get("per_page", 10))
        posts, total = await services.blog.search_posts(g.s, query, page, per_page)
        return {"posts": [dto_to_dict(p) for p in posts], "total": total}

    _handlers["search-posts"] = _search_posts

    return bp