# scripts/tests/test_build_canonical_filename.py
from orchestration.sharepoint_renamer_orchestrator import build_canonical_filename

UPRN = "10093456789"
ADDRESS = "1 High Street, Anytown"
POSTCODE = "SW1A 1AA"
STREET = "1 High Street"


def test_already_renamed_returns_none() -> None:
    # Arrange
    original = f"{UPRN}_High Street SW1A 1AA_EPC Report.pdf"

    # Act
    result = build_canonical_filename(UPRN, ADDRESS, POSTCODE, original)

    # Assert
    assert result is None


def test_address_postcode_prefix_stripped() -> None:
    # Arrange
    original = f"{ADDRESS} {POSTCODE} - EPC Report.pdf"

    # Act
    result = build_canonical_filename(UPRN, ADDRESS, POSTCODE, original)

    # Assert
    assert result == f"{UPRN}_{STREET} {POSTCODE}_EPC Report.pdf"


def test_address_only_prefix_stripped() -> None:
    # Arrange
    original = f"{ADDRESS} - EPC Report.pdf"

    # Act
    result = build_canonical_filename(UPRN, ADDRESS, POSTCODE, original)

    # Assert
    assert result == f"{UPRN}_{STREET} {POSTCODE}_EPC Report.pdf"


def test_street_postcode_prefix_stripped() -> None:
    # Arrange
    original = f"{STREET} {POSTCODE} - EPC Report.pdf"

    # Act
    result = build_canonical_filename(UPRN, ADDRESS, POSTCODE, original)

    # Assert
    assert result == f"{UPRN}_{STREET} {POSTCODE}_EPC Report.pdf"


def test_street_only_prefix_stripped() -> None:
    # Arrange
    original = f"{STREET} - EPC Report.pdf"

    # Act
    result = build_canonical_filename(UPRN, ADDRESS, POSTCODE, original)

    # Assert
    assert result == f"{UPRN}_{STREET} {POSTCODE}_EPC Report.pdf"


def test_dash_separator_removed_after_prefix_strip() -> None:
    # Arrange – " - " separator between prefix and doc name
    original = f"{STREET} {POSTCODE} - Floor Plan.pdf"

    # Act
    result = build_canonical_filename(UPRN, ADDRESS, POSTCODE, original)

    # Assert
    assert result == f"{UPRN}_{STREET} {POSTCODE}_Floor Plan.pdf"


def test_underscore_separator_removed_after_prefix_strip() -> None:
    # Arrange – " _ " separator between prefix and doc name
    original = f"{STREET} {POSTCODE} _ Floor Plan.pdf"

    # Act
    result = build_canonical_filename(UPRN, ADDRESS, POSTCODE, original)

    # Assert
    assert result == f"{UPRN}_{STREET} {POSTCODE}_Floor Plan.pdf"


def test_no_recognised_prefix_preserves_stem() -> None:
    # Arrange
    original = "Completely Different Name.pdf"

    # Act
    result = build_canonical_filename(UPRN, ADDRESS, POSTCODE, original)

    # Assert
    assert result == f"{UPRN}_{STREET} {POSTCODE}_Completely Different Name.pdf"


def test_no_doc_name_after_strip_omits_trailing_separator() -> None:
    # Arrange – stem is exactly the address prefix with no trailing doc name
    original = f"{STREET} {POSTCODE}.pdf"

    # Act
    result = build_canonical_filename(UPRN, ADDRESS, POSTCODE, original)

    # Assert
    assert result == f"{UPRN}_{STREET} {POSTCODE}.pdf"