#!/usr/bin/env python3
"""BLE sensor status / log / advertise command (collector UI bridge)."""
import json

from flask import Blueprint, jsonify

from auth import login_required
from paths import run_dir

sensors_bp = Blueprint("sensors", __name__)

STATUS_NAME = "sensors-status.json"
LOG_NAME = "sensors-ui.log"
CMD_NAME = "sensors-cmd"
LOG_LIMIT = 200


def _read_status():
    path = run_dir() / STATUS_NAME
    if not path.exists():
        return {
            "n": 4,
            "pool_full": False,
            "period_s": 30,
            "slots": [],
            "ts": 0,
            "available": False,
        }
    try:
        data = json.loads(path.read_text(encoding="utf-8"))
        data["available"] = True
        return data
    except (OSError, ValueError):
        return {"available": False, "slots": [], "error": "bad status file"}


def _read_log(limit=LOG_LIMIT):
    path = run_dir() / LOG_NAME
    if not path.exists():
        return []
    try:
        lines = path.read_text(encoding="utf-8").splitlines()
    except OSError:
        return []
    entries = []
    for line in lines[-limit:]:
        line = line.strip()
        if not line:
            continue
        try:
            entries.append(json.loads(line))
        except ValueError:
            continue
    entries.reverse()
    return entries


def _write_advertise_cmd():
    path = run_dir() / CMD_NAME
    try:
        path.write_text(json.dumps({"op": "advertise"}), encoding="utf-8")
        return True
    except OSError:
        return False


@sensors_bp.route("/api/sensors", methods=["GET"])
@login_required
def api_sensors():
    return jsonify(_read_status())


@sensors_bp.route("/api/sensors/log", methods=["GET"])
@login_required
def api_sensors_log():
    return jsonify({"entries": _read_log()})


@sensors_bp.route("/api/sensors/advertise", methods=["POST"])
@login_required
def api_sensors_advertise():
    if not _write_advertise_cmd():
        return jsonify({"ok": False, "error": "cannot write command"}), 500
    return jsonify({"ok": True})