"""Tests for the Signal Identification (guess) API endpoint."""

import pytest


@pytest.fixture
def auth_client(client):
    """Client with logged-in session."""
    with client.session_transaction() as sess:
        sess["logged_in"] = True
    return client


def test_signal_guess_fm_broadcast(auth_client):
    """FM broadcast frequency should return a known signal type."""
    resp = auth_client.post(
        "/receiver/signal/guess",
        json={
            "frequency_mhz": 98.1,
            "modulation": "wfm",
        },
    )
    assert resp.status_code == 200
    data = resp.get_json()
    assert data["status"] == "ok"
    assert data["primary_label"]
    assert data["confidence"] in ("HIGH", "MEDIUM", "LOW")


def test_signal_guess_airband(auth_client):
    """Airband frequency should be identified."""
    resp = auth_client.post(
        "/receiver/signal/guess",
        json={
            "frequency_mhz": 121.5,
            "modulation": "am",
        },
    )
    assert resp.status_code == 200
    data = resp.get_json()
    assert data["status"] == "ok"
    assert data["primary_label"]


def test_signal_guess_ism_band(auth_client):
    """ISM band frequency (433.92 MHz) should be identified."""
    resp = auth_client.post(
        "/receiver/signal/guess",
        json={
            "frequency_mhz": 433.92,
        },
    )
    assert resp.status_code == 200
    data = resp.get_json()
    assert data["status"] == "ok"
    assert data["primary_label"]
    assert data["confidence"] in ("HIGH", "MEDIUM", "LOW")


def test_signal_guess_missing_frequency(auth_client):
    """Missing frequency should return 400."""
    resp = auth_client.post("/receiver/signal/guess", json={})
    assert resp.status_code == 400
    data = resp.get_json()
    assert data["status"] == "error"


def test_signal_guess_invalid_frequency(auth_client):
    """Invalid frequency value should return 400."""
    resp = auth_client.post(
        "/receiver/signal/guess",
        json={
            "frequency_mhz": "abc",
        },
    )
    assert resp.status_code == 400


def test_signal_guess_negative_frequency(auth_client):
    """Negative frequency should return 400."""
    resp = auth_client.post(
        "/receiver/signal/guess",
        json={
            "frequency_mhz": -5.0,
        },
    )
    assert resp.status_code == 400


def test_signal_guess_with_region(auth_client):
    """Specifying region should work."""
    resp = auth_client.post(
        "/receiver/signal/guess",
        json={
            "frequency_mhz": 462.5625,
            "region": "US",
        },
    )
    assert resp.status_code == 200
    data = resp.get_json()
    assert data["status"] == "ok"


def test_signal_guess_response_structure(auth_client):
    """Response should have all expected fields."""
    resp = auth_client.post(
        "/receiver/signal/guess",
        json={
            "frequency_mhz": 146.52,
            "modulation": "fm",
        },
    )
    assert resp.status_code == 200
    data = resp.get_json()
    assert "primary_label" in data
    assert "confidence" in data
    assert "alternatives" in data
    assert "explanation" in data
    assert "tags" in data
    assert isinstance(data["alternatives"], list)
    assert isinstance(data["tags"], list)