"""Stats API routes."""

import os
from flask import Blueprint, jsonify


def create_stats_blueprint(server_config):
    """
    Create the stats API blueprint.

    Args:
        server_config: Dict with keys:
            - image_dir: Camera images directory
            - c2_root: C2 root directory path
            - get_device_registry: Callable returning device registry
            - get_mlat_engine: Callable returning MLAT engine
            - require_api_auth: Auth decorator
    """
    bp = Blueprint("api_stats", __name__, url_prefix="/api")

    image_dir = server_config["image_dir"]
    c2_root = server_config["c2_root"]
    get_registry = server_config["get_device_registry"]
    get_mlat = server_config["get_mlat_engine"]
    require_api_auth = server_config["require_api_auth"]

    @bp.route("/stats")
    @require_api_auth
    def stats():
        """Get server statistics."""
        full_image_dir = os.path.join(c2_root, image_dir)

        # Camera count
        try:
            camera_count = len([
                f for f in os.listdir(full_image_dir)
                if f.endswith(".jpg")
            ])
        except FileNotFoundError:
            camera_count = 0

        # Device count
        device_count = 0
        registry = get_registry()
        if registry:
            device_count = len(list(registry.all()))

        # MLAT state
        mlat_engine = get_mlat()
        mlat_state = mlat_engine.get_state()

        return jsonify({
            "active_cameras": camera_count,
            "connected_devices": device_count,
            "multilateration_scanners": mlat_state["scanners_count"],
            "server_running": True
        })

    return bp