#!/usr/bin/env python3
"""
Integration test for the Bridge Daemon.
Requires a running MQTT broker on localhost:1883 (e.g., Mosquitto from backend docker-compose).
"""

import json
import os
import sys
import time
import unittest
from datetime import datetime, timezone
from unittest.mock import MagicMock, patch

import paho.mqtt.client as mqtt

# Ensure src is importable
sys.path.insert(0, os.path.join(os.path.dirname(__file__), "src"))

os.environ.setdefault("MQTT_HOST", "localhost")
os.environ.setdefault("MQTT_PORT", "1883")
os.environ.setdefault("MESHTASTIC_DEVICE", "/dev/fake")
os.environ.setdefault("MESHTASTIC_HOST", "")
os.environ.setdefault("GATEWAY_NODE_ID", "!testgateway")

from main import BridgeDaemon
import config


class TestBridgeDaemon(unittest.TestCase):
    @classmethod
    def setUpClass(cls):
        cls.mqtt_client = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2)
        cls.mqtt_client.connect("localhost", 1883, 60)
        cls.mqtt_client.loop_start()

        cls.inbound_msgs = []
        cls.ingest_msgs = []

        def on_message(client, userdata, msg):
            payload = json.loads(msg.payload.decode())
            if msg.topic == "kosmo/mesh/inbound":
                cls.inbound_msgs.append(payload)
            elif msg.topic == "kosmo/ingest/enviro":
                cls.ingest_msgs.append(payload)

        cls.mqtt_client.on_message = on_message
        cls.mqtt_client.subscribe("kosmo/mesh/inbound")
        cls.mqtt_client.subscribe("kosmo/ingest/enviro")

    @classmethod
    def tearDownClass(cls):
        cls.mqtt_client.loop_stop()
        cls.mqtt_client.disconnect()

    def test_outbound_mesh_injection(self):
        """MQTT -> Mesh: outbound message should trigger sendText on the mock interface."""
        mock_iface = MagicMock()
        mock_iface.myInfo = MagicMock()
        mock_iface.myInfo.my_node_num = 0xDEADBEEF

        with patch("main.MeshtasticClient") as MockMesh:
            instance = MockMesh.return_value
            instance.iface = mock_iface
            instance.start = MagicMock()
            instance.stop = MagicMock()
            instance.send_text = MagicMock(return_value=True)

            daemon = BridgeDaemon()
            daemon.mesh = instance
            daemon.mqtt.start()
            time.sleep(1)

            # Publish outbound message
            outbound = {"message_id": "msg-123", "text": "Hello mesh"}
            self.mqtt_client.publish("kosmo/mesh/outbound/!a1b2c3d4", json.dumps(outbound))
            time.sleep(1.5)

            instance.send_text.assert_called()
            args, kwargs = instance.send_text.call_args
            self.assertIn("[Web] Hello mesh", args[0])
            self.assertEqual(kwargs.get("destination_id"), "!a1b2c3d4")

            daemon.mqtt.stop()

    def test_inbound_mesh_to_mqtt(self):
        """Mesh -> MQTT: text packet from mesh should appear on kosmo/mesh/inbound."""
        mock_iface = MagicMock()
        mock_iface.myInfo = MagicMock()
        mock_iface.myInfo.my_node_num = 0xDEADBEEF

        with patch("main.MeshtasticClient") as MockMesh:
            instance = MockMesh.return_value
            instance.iface = mock_iface
            instance.start = MagicMock()
            instance.stop = MagicMock()

            daemon = BridgeDaemon()
            daemon.mesh = instance
            daemon.mqtt.start()
            time.sleep(0.5)

            # Simulate mesh text packet
            packet = {
                "fromId": "!deadbeef",
                "decoded": {
                    "portnum": "TEXT_MESSAGE_APP",
                    "payload": b"Hello from the woods",
                },
                "hopLimit": 5,
                "hopStart": 7,
                "rxRssi": -88,
                "rxSnr": 9.5,
            }
            daemon._on_mesh_packet(packet)
            time.sleep(1)

            daemon.mqtt.stop()

        # Give MQTT a moment to flush
        time.sleep(0.5)
        self.assertTrue(
            any(m.get("source_node_id") == "!deadbeef" and m.get("text") == "Hello from the woods" for m in self.inbound_msgs),
            f"Expected inbound message not found. Got: {self.inbound_msgs}"
        )

    def test_enviro_json_text_fallback(self):
        """Mesh -> MQTT: text packet containing enviro JSON should be routed to kosmo/ingest/enviro."""
        mock_iface = MagicMock()
        mock_iface.myInfo = MagicMock()
        mock_iface.myInfo.my_node_num = 0xCAFEBABE

        with patch("main.MeshtasticClient") as MockMesh:
            instance = MockMesh.return_value
            instance.iface = mock_iface
            instance.start = MagicMock()
            instance.stop = MagicMock()

            daemon = BridgeDaemon()
            daemon.mesh = instance
            daemon.mqtt.start()
            time.sleep(0.5)

            enviro_payload = {
                "type": "enviro_reading",
                "node_id": "!enviro01",
                "payload": {
                    "temperature_c": 21.5,
                    "humidity_percent": 55.0,
                },
            }
            packet = {
                "fromId": "!enviro01",
                "decoded": {
                    "portnum": "TEXT_MESSAGE_APP",
                    "payload": json.dumps(enviro_payload).encode(),
                },
                "hopLimit": 3,
                "hopStart": 5,
            }
            daemon._on_mesh_packet(packet)
            time.sleep(1)

            daemon.mqtt.stop()

        time.sleep(0.5)
        self.assertTrue(
            any(m.get("node_id") == "!enviro01" and m.get("payload", {}).get("temperature_c") == 21.5 for m in self.ingest_msgs),
            f"Expected ingest message not found. Got: {self.ingest_msgs}"
        )


class TestMeshtasticClientConnection(unittest.TestCase):
    def test_serial_interface_used_by_default(self):
        with patch("meshtastic_client.SerialInterface") as MockSerial, \
             patch("meshtastic_client.TCPInterface") as MockTCP:
            from meshtastic_client import MeshtasticClient
            client = MeshtasticClient(lambda p: None)
            client._connect()
            MockSerial.assert_called_once_with(devPath="/dev/fake")
            MockTCP.assert_not_called()
            client.stop()

    def test_tcp_interface_used_when_host_set(self):
        with patch.dict(os.environ, {"MESHTASTIC_HOST": "192.168.1.45", "MESHTASTIC_TCP_PORT": "4403"}, clear=False):
            # re-import config to pick up env change
            import importlib
            import config as cfg_module
            importlib.reload(cfg_module)
            with patch("meshtastic_client.SerialInterface") as MockSerial, \
                 patch("meshtastic_client.TCPInterface") as MockTCP:
                from meshtastic_client import MeshtasticClient
                client = MeshtasticClient(lambda p: None)
                client._connect()
                MockTCP.assert_called_once_with(hostname="192.168.1.45", portNumber=4403)
                MockSerial.assert_not_called()
                client.stop()


if __name__ == "__main__":
    unittest.main()