"""Compatibility imports for callers of the former Relative-only module.

All projection is now performed by :mod:`adapter`; this file has no separate
alignment calculation.
"""
from __future__ import annotations

import numpy as np

from adapter import adapt_official_split


def project_modality(values: np.ndarray, modality: str, *, reported_length: int | None = None,
                     attention_mask: np.ndarray | None = None):
    """Legacy single-modality call, delegated to the unified projection kernel."""
    from adapter.core import _relative_modality
    from adapter.coordinates import relative_targets
    from adapter.projection import project_intervals

    record = {modality: values}
    if modality == "text":
        record["attention_mask"] = attention_mask
    else:
        record[f"{modality}_length"] = reported_length
    item = _relative_modality(record, modality)
    view = project_intervals(item.values, item.intervals, relative_targets(50),
                             item.observed, item.quality)
    view.source_span = len(item.values)
    view.reported_length = item.reported_length
    view.length_conflict = item.length_conflict
    view.tail_ambiguous = item.tail_ambiguous
    return view


adapt_split = adapt_official_split