import json

import pytest

from modjam.config import StationConfig


SAMPLE = {
    "this_station_name": "A",
    "channel_name": "modjam",
    "channel_psk": "MTIzNGFiY2RlZmdoaWprbA==",
    "idle_heartbeat_min": 2,
    "control_radio": {
        "frequency_mhz": 915.125,
        "bandwidth_khz": 500,
        "spread_factor": 12,
        "coding_rate": 8,
        "tx_power_dbm": 22,
    },
    "data_radio": {
        "frequency_mhz": 915.125,
        "bandwidth_khz": 500,
        "spread_factor": 7,
        "coding_rate": 5,
        "tx_power_dbm": 1,
    },
}


def _write(tmp_path, data):
    p = tmp_path / "modjam-config.json"
    p.write_text(json.dumps(data))
    return p


def test_load_full_config(tmp_path):
    cfg = StationConfig.load(_write(tmp_path, SAMPLE))
    assert cfg.this_station_name == "A"
    assert cfg.idle_heartbeat_min == 2
    assert cfg.control_radio.spread_factor == 12
    assert cfg.data_radio is not None
    assert cfg.data_radio.tx_power_dbm == 1


def test_load_defaults_heartbeat(tmp_path):
    d = dict(SAMPLE)
    d.pop("idle_heartbeat_min")
    cfg = StationConfig.load(_write(tmp_path, d))
    assert cfg.idle_heartbeat_min == 15


def test_load_without_data_radio(tmp_path):
    d = dict(SAMPLE)
    d.pop("data_radio")
    cfg = StationConfig.load(_write(tmp_path, d))
    assert cfg.data_radio is None


def test_load_missing_required(tmp_path):
    d = dict(SAMPLE)
    d.pop("channel_name")
    with pytest.raises(KeyError):
        StationConfig.load(_write(tmp_path, d))