import pytest

from edge.config import (frame_interval_from_env, load_config, queue_db_path,
                         require_upload_config)

def test_defaults_when_env_empty():
    cfg = load_config({})
    assert cfg.device_id == "pi-unknown"
    assert cfg.fall.prone_confirm_s == 3.0
    assert cfg.fall.no_motion_s == 10.0
    assert cfg.camera_id == "cam-01"
    assert cfg.cafe24_url == ""
    assert cfg.secret == ""
    assert cfg.ghost.reappear_s == 10.0
    assert cfg.zone.debounce_s == 0.75
    assert cfg.engine.cooldown_s == 30.0

def test_env_overrides():
    env = {
        "DEVICE_ID": "pi-w1", "CAMERA_ID": "cam-9",
        "CAFE24_URL": "https://x/api/events", "DEVICE_SECRET": "s",
        "FALL_PRONE_S": "2.0", "FALL_NO_MOTION_S": "8",
        "IMMOBILE_S": "90", "COOLDOWN_S": "45",
        "GHOST_REAPPEAR_S": "7", "ZONE_DEBOUNCE_S": "1.5",
    }
    cfg = load_config(env)
    assert cfg.device_id == "pi-w1"
    assert cfg.camera_id == "cam-9"
    assert cfg.fall.prone_confirm_s == 2.0
    assert cfg.fall.no_motion_s == 8.0
    assert cfg.immobility.immobile_s == 90.0
    assert cfg.engine.cooldown_s == 45.0
    assert cfg.engine.camera_id == "cam-9"
    assert cfg.ghost.reappear_s == 7.0
    assert cfg.zone.debounce_s == 1.5


def test_require_upload_config_rejects_blank_url_and_secret():
    # A blank CAFE24_URL or DEVICE_SECRET must fail LOUD at startup. Left silent, the daemon
    # runs green while every upload fails (bad URL -> requests error, caught) and the offline
    # queue grows until the SD card is full.
    with pytest.raises(ValueError, match="CAFE24_URL"):
        require_upload_config(load_config({"DEVICE_SECRET": "s"}))
    with pytest.raises(ValueError, match="DEVICE_SECRET"):
        require_upload_config(load_config({"CAFE24_URL": "https://x/move_detect"}))
    # Whitespace-only is still blank.
    with pytest.raises(ValueError):
        require_upload_config(load_config({"CAFE24_URL": "  ", "DEVICE_SECRET": "  "}))


def test_require_upload_config_passes_when_both_present():
    # A real per-device secret is a long HMAC-derived hex string, on an https URL.
    cfg = load_config({"CAFE24_URL": "https://x/move_detect",
                       "DEVICE_SECRET": "0123456789abcdef0123"})
    require_upload_config(cfg)   # must not raise


def test_require_upload_config_rejects_placeholder_and_http():
    # Non-empty ship-time placeholders pass a blank check but are never a real value; a unit left
    # at one uploads nothing while looking healthy. http would leak worker snapshots in plaintext.
    with pytest.raises(ValueError, match="DEVICE_SECRET"):
        require_upload_config(load_config({"CAFE24_URL": "https://x/move_detect",
                                           "DEVICE_SECRET": "CHANGEME"}))
    with pytest.raises(ValueError, match="CAFE24_URL"):
        require_upload_config(load_config({"CAFE24_URL": "https://your-domain.example/move_detect",
                                           "DEVICE_SECRET": "0123456789abcdef0123"}))
    with pytest.raises(ValueError, match="https"):
        require_upload_config(load_config({"CAFE24_URL": "http://x/move_detect",
                                           "DEVICE_SECRET": "0123456789abcdef0123"}))
    with pytest.raises(ValueError, match="too short"):
        require_upload_config(load_config({"CAFE24_URL": "https://x/move_detect",
                                           "DEVICE_SECRET": "short"}))


def test_load_config_rejects_non_finite_or_nonpositive_motion_thr():
    # A 0 / NaN / inf MOTION_THR would make every track read as "still" -> constant no_motion.
    for bad in ("0", "-1", "nan", "inf"):
        with pytest.raises(ValueError, match="MOTION_THR"):
            load_config({"MOTION_THR": bad})
    # A sane value flows through to both detectors.
    cfg = load_config({"MOTION_THR": "0.3"})
    assert cfg.fall.motion_thr == 0.3 and cfg.immobility.motion_thr == 0.3


def test_frame_interval_defaults_and_validates():
    assert frame_interval_from_env({}) == pytest.approx(1 / 12)
    assert frame_interval_from_env({"TARGET_FPS": "24"}) == pytest.approx(1 / 24)
    # TARGET_FPS=0 -> ZeroDivisionError today -> infinite systemd crash loop; must be rejected.
    with pytest.raises(ValueError):
        frame_interval_from_env({"TARGET_FPS": "0"})
    with pytest.raises(ValueError):
        frame_interval_from_env({"TARGET_FPS": "12fps"})
    with pytest.raises(ValueError):
        frame_interval_from_env({"TARGET_FPS": "-5"})


def test_queue_db_path_defaults_absolute_under_state_dir():
    # A relative 'queue.db' is unwritable under the hardened unit (ProtectSystem=strict,
    # WorkingDirectory read-only) -> crash loop. Default to the writable StateDirectory.
    assert queue_db_path({}) == "/var/lib/move-detect/queue.db"
    assert queue_db_path({"QUEUE_DB": "/custom/q.db"}) == "/custom/q.db"