"""RTL_433 sensor monitoring routes."""

from __future__ import annotations

import json
import queue
import subprocess
import threading
from datetime import datetime
from typing import Generator

from flask import Blueprint, jsonify, request, Response

import app as app_module
from utils.logging import sensor_logger as logger

sensor_bp = Blueprint('sensor', __name__)


def stream_sensor_output(process: subprocess.Popen[bytes]) -> None:
    """Stream rtl_433 JSON output to queue."""
    try:
        app_module.sensor_queue.put({'type': 'status', 'text': 'started'})

        for line in iter(process.stdout.readline, b''):
            line = line.decode('utf-8', errors='replace').strip()
            if not line:
                continue

            try:
                # rtl_433 outputs JSON objects, one per line
                data = json.loads(line)
                data['type'] = 'sensor'
                app_module.sensor_queue.put(data)

                # Log if enabled
                if app_module.logging_enabled:
                    try:
                        with open(app_module.log_file_path, 'a') as f:
                            timestamp = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
                            f.write(f"{timestamp} | {data.get('model', 'Unknown')} | {json.dumps(data)}\n")
                    except Exception:
                        pass
            except json.JSONDecodeError:
                # Not JSON, send as raw
                app_module.sensor_queue.put({'type': 'raw', 'text': line})

    except Exception as e:
        app_module.sensor_queue.put({'type': 'error', 'text': str(e)})
    finally:
        process.wait()
        app_module.sensor_queue.put({'type': 'status', 'text': 'stopped'})
        with app_module.sensor_lock:
            app_module.sensor_process = None


@sensor_bp.route('/start_sensor', methods=['POST'])
def start_sensor() -> Response:
    with app_module.sensor_lock:
        if app_module.sensor_process:
            return jsonify({'status': 'error', 'message': 'Sensor already running'})

        data = request.json
        freq = data.get('frequency', '433.92')
        gain = data.get('gain', '0')
        ppm = data.get('ppm', '0')
        device = data.get('device', '0')

        # Clear queue
        while not app_module.sensor_queue.empty():
            try:
                app_module.sensor_queue.get_nowait()
            except queue.Empty:
                break

        # Build rtl_433 command
        cmd = [
            'rtl_433',
            '-d', str(device),
            '-f', f'{freq}M',
            '-F', 'json'
        ]

        if gain and gain != '0':
            cmd.extend(['-g', str(gain)])

        if ppm and ppm != '0':
            cmd.extend(['-p', str(ppm)])

        full_cmd = ' '.join(cmd)
        logger.info(f"Running: {full_cmd}")

        try:
            app_module.sensor_process = subprocess.Popen(
                cmd,
                stdout=subprocess.PIPE,
                stderr=subprocess.PIPE,
                bufsize=1
            )

            # Start output thread
            thread = threading.Thread(target=stream_sensor_output, args=(app_module.sensor_process,))
            thread.daemon = True
            thread.start()

            # Monitor stderr
            def monitor_stderr():
                for line in app_module.sensor_process.stderr:
                    err = line.decode('utf-8', errors='replace').strip()
                    if err:
                        logger.debug(f"[rtl_433] {err}")
                        app_module.sensor_queue.put({'type': 'info', 'text': f'[rtl_433] {err}'})

            stderr_thread = threading.Thread(target=monitor_stderr)
            stderr_thread.daemon = True
            stderr_thread.start()

            app_module.sensor_queue.put({'type': 'info', 'text': f'Command: {full_cmd}'})

            return jsonify({'status': 'started', 'command': full_cmd})

        except FileNotFoundError:
            return jsonify({'status': 'error', 'message': 'rtl_433 not found. Install with: brew install rtl_433'})
        except Exception as e:
            return jsonify({'status': 'error', 'message': str(e)})


@sensor_bp.route('/stop_sensor', methods=['POST'])
def stop_sensor() -> Response:
    with app_module.sensor_lock:
        if app_module.sensor_process:
            app_module.sensor_process.terminate()
            try:
                app_module.sensor_process.wait(timeout=2)
            except subprocess.TimeoutExpired:
                app_module.sensor_process.kill()
            app_module.sensor_process = None
            return jsonify({'status': 'stopped'})

        return jsonify({'status': 'not_running'})


@sensor_bp.route('/stream_sensor')
def stream_sensor() -> Response:
    def generate() -> Generator[str, None, None]:
        while True:
            try:
                msg = app_module.sensor_queue.get(timeout=1)
                yield f"data: {json.dumps(msg)}\n\n"
            except queue.Empty:
                yield f"data: {json.dumps({'type': 'keepalive'})}\n\n"

    response = Response(generate(), mimetype='text/event-stream')
    response.headers['Cache-Control'] = 'no-cache'
    response.headers['X-Accel-Buffering'] = 'no'
    response.headers['Connection'] = 'keep-alive'
    return response