import sys
from pathlib import Path

ROOT = Path(__file__).resolve().parents[1]
PICO = ROOT / "pico-dashboard"
sys.path.insert(0, str(PICO))

from comms.protocol import make_status_request, make_set_relay
from state.app_state import AppState
from alarms.alarm_manager import AlarmManager
from ui.screen_manager import ScreenManager


def test_protocol_messages():
    assert make_status_request() == {"type": "status_request"}

    assert make_set_relay("starlink", True) == {
        "type": "set_relay",
        "relay": "starlink",
        "enabled": True,
    }


def test_app_state_status_update():
    state = AppState()

    state.update_from_status({
        "timestamp": 123,
        "battery": {"soc": 82, "voltage": 13.2},
        "temps": {"fridge_zone_1": 34.5},
        "sensor_health": {"fridge_zone_1": True},
        "relays": {"starlink": True},
        "vehicle": {"ignition_on": False},
        "network": {"uart_connected": True},
    })

    assert state.last_status_timestamp == 123
    assert state.battery["soc"] == 82
    assert state.temps["fridge_zone_1"] == 34.5
    assert state.sensor_health["fridge_zone_1"] is True
    assert state.relays["starlink"] is True
    assert state.network["uart_connected"] is True


def test_alarm_manager():
    state = AppState()
    state.update_from_status({
        "battery": {"soc": 10, "voltage": 11.8},
        "temps": {"fridge_zone_1": 45.0, "fridge_zone_2": 35.0},
        "sensor_health": {
            "fridge_zone_1": True,
            "fridge_zone_2": True,
            "rear_seat": False,
            "outside": True,
        },
        "network": {"uart_connected": False},
    })

    alarms = AlarmManager().evaluate(state)

    assert "battery_soc_low" in alarms
    assert "battery_voltage_low" in alarms
    assert "fridge_zone_1_high" in alarms
    assert "communication_lost" in alarms
    assert "sensor_failure:rear_seat" in alarms


def test_screen_manager():
    screens = ScreenManager()

    assert screens.current_screen == "dashboard"

    screens.go_to("battery")
    assert screens.current_screen == "battery"

    screens.next_screen()
    assert screens.current_screen == "temps"

    screens.previous_screen()
    assert screens.current_screen == "battery"


class FakeUart:
    def __init__(self):
        self.writes = []
        self.read_chunks = []

    def write(self, data):
        self.writes.append(data)

    def any(self):
        return len(self.read_chunks) > 0

    def read(self):
        if self.read_chunks:
            return self.read_chunks.pop(0)
        return b""


def test_uart_client_send_message():
    from comms.uart_client import UartClient

    fake = FakeUart()
    client = UartClient(fake)

    client.send_message({"type": "status_request"})

    assert fake.writes == [b'{"type":"status_request"}\n']


def test_uart_client_reads_newline_delimited_json():
    from comms.uart_client import UartClient

    fake = FakeUart()
    fake.read_chunks = [
        b'{"type":"status_response","timestamp":1}\n',
        b'{"type":"relay_response","relay":"fridge","enabled":true}\n',
    ]

    client = UartClient(fake)
    messages = client.read_available_messages()

    assert messages == [
        {"type": "status_response", "timestamp": 1},
        {"type": "relay_response", "relay": "fridge", "enabled": True},
    ]


def test_uart_client_handles_partial_messages():
    from comms.uart_client import UartClient

    fake = FakeUart()
    client = UartClient(fake)

    fake.read_chunks = [b'{"type":"status_', b'response"}\n']

    messages = client.read_available_messages()

    assert messages == [{"type": "status_response"}]


def test_uart_client_handles_invalid_json():
    from comms.uart_client import UartClient

    fake = FakeUart()
    fake.read_chunks = [b'not json\n']

    client = UartClient(fake)
    messages = client.read_available_messages()

    assert messages[0]["type"] == "error"
    assert messages[0]["message"] == "invalid_json"