"""Likes app action endpoints."""
from __future__ import annotations

from quart import Blueprint, g, jsonify, request

from shared.infrastructure.actions import ACTION_HEADER


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

    @bp.before_request
    async def _require_action_header():
        if not request.headers.get(ACTION_HEADER):
            return jsonify({"error": "forbidden"}), 403
        from shared.infrastructure.internal_auth import validate_internal_request
        if not validate_internal_request():
            return jsonify({"error": "forbidden"}), 403

    _handlers: dict[str, object] = {}

    @bp.post("/<action_name>")
    async def handle_action(action_name: str):
        handler = _handlers.get(action_name)
        if handler is None:
            return jsonify({"error": "unknown action"}), 404
        try:
            result = await handler()
            return jsonify(result)
        except Exception as exc:
            import logging
            logging.getLogger(__name__).exception("Action %s failed", action_name)
            return jsonify({"error": str(exc)}), 500

    # --- toggle ---
    async def _toggle():
        """Toggle a like. Returns {"liked": bool}."""
        from sqlalchemy import select, update, func
        from likes.models.like import Like

        data = await request.get_json(force=True)
        user_id = data["user_id"]
        target_type = data["target_type"]
        target_slug = data.get("target_slug")
        target_id = data.get("target_id")

        filters = [
            Like.user_id == user_id,
            Like.target_type == target_type,
            Like.deleted_at.is_(None),
        ]
        if target_slug is not None:
            filters.append(Like.target_slug == target_slug)
        elif target_id is not None:
            filters.append(Like.target_id == target_id)
        else:
            return {"error": "target_slug or target_id required"}, 400

        existing = await g.s.scalar(select(Like).where(*filters))

        if existing:
            # Unlike: soft delete
            await g.s.execute(
                update(Like).where(Like.id == existing.id).values(deleted_at=func.now())
            )
            return {"liked": False}
        else:
            # Like: insert new
            new_like = Like(
                user_id=user_id,
                target_type=target_type,
                target_slug=target_slug,
                target_id=target_id,
            )
            g.s.add(new_like)
            await g.s.flush()
            return {"liked": True}

    _handlers["toggle"] = _toggle

    return bp