from __future__ import annotations

import importlib.util
import json
import sys
from pathlib import Path

import cv2

ROOT = Path(__file__).resolve().parents[1]

spec = importlib.util.spec_from_file_location('dse_omr_v31_app', ROOT / 'app.py')
if spec is None or spec.loader is None:
    raise RuntimeError('Cannot load app.py')
app = importlib.util.module_from_spec(spec)
sys.modules['dse_omr_v31_app'] = app
spec.loader.exec_module(app)

config = json.loads((ROOT / 'marker_config.json').read_text(encoding='utf-8'))

tests = [
    ('strict_clean', ROOT / 'samples/sample_phone_perspective.jpg', 'strict_pass'),
    ('shadow_rescue', ROOT / 'samples/sample_phone_shadow_rescue.jpg', 'rescue_pass'),
    ('missing_tl', ROOT / 'samples/sample_phone_missing_tl.jpg', 'reject'),
]

failed = False
for name, path, expected in tests:
    image = cv2.imread(str(path))
    if image is None:
        print(f'{name}: FAIL cannot read {path}')
        failed = True
        continue
    try:
        _, _, rescue_used = app._detect_large_corner_markers(image, config)
        actual = 'rescue_pass' if rescue_used else 'strict_pass'
    except app.MarkerDetectionError:
        actual = 'reject'

    ok = actual == expected
    print(f'{name}: {"PASS" if ok else "FAIL"} expected={expected} actual={actual}')
    failed = failed or not ok

if failed:
    raise SystemExit(1)
print('V3.1 FUNCTIONAL MARKER TESTS PASSED')