from transliteration.data.validate import (
    ValidationConfig,
    is_corrupted_pair,
    is_valid_roman,
    is_valid_target_script,
    run_validation,
)


def test_valid_pair_accepted():
    records = [{"source": "t", "language": "hi", "roman": "namaste", "target": "नमस्ते"}]
    accepted, stats = run_validation(records)
    assert stats.accepted == 1
    assert accepted[0]["target"] == "नमस्ते"


def test_empty_rejected():
    records = [{"source": "t", "language": "hi", "roman": "", "target": "नमस्ते"}]
    accepted, stats = run_validation(records)
    assert stats.accepted == 0
    assert stats.empty == 1


def test_wrong_script_rejected():
    # Tamil target labeled as Hindi -> should be rejected
    records = [{"source": "t", "language": "hi", "roman": "vanakkam", "target": "வணக்கம்"}]
    accepted, stats = run_validation(records)
    assert stats.accepted == 0
    assert stats.bad_target_script == 1


def test_non_roman_source_rejected():
    records = [{"source": "t", "language": "hi", "roman": "नमस्ते", "target": "नमस्ते"}]
    accepted, stats = run_validation(records)
    assert stats.accepted == 0


def test_duplicate_rejected():
    rec = {"source": "t", "language": "hi", "roman": "namaste", "target": "नमस्ते"}
    accepted, stats = run_validation([rec, dict(rec)])
    assert stats.accepted == 1
    assert stats.duplicate == 1


def test_too_long_rejected():
    cfg = ValidationConfig(max_chars=10)
    records = [{"source": "t", "language": "hi", "roman": "a" * 20, "target": "न" * 20}]
    accepted, stats = run_validation(records, cfg)
    assert stats.accepted == 0
    assert stats.too_long == 1


def test_corrupted_pair_identical_strings():
    assert is_corrupted_pair("namaste", "namaste") is True


def test_is_valid_roman():
    cfg = ValidationConfig()
    assert is_valid_roman("namaste hai", cfg) is True
    assert is_valid_roman("नमस्ते", cfg) is False


def test_is_valid_target_script():
    cfg = ValidationConfig()
    assert is_valid_target_script("नमस्ते", "hi", cfg) is True
    assert is_valid_target_script("வணக்கம்", "hi", cfg) is False
    assert is_valid_target_script("வணக்கம்", "ta", cfg) is True