"""Boundary tests for ``core.matching.version_mismatch``.

Pin every shape the version-mismatch escape valve has to handle so
future drift fails here instead of at runtime against a real download:
one-sided bare cases (the live-recording MB-metadata-gap that issue
#607 reported), two-sided real mismatches (live vs remix — keep
strict), high vs low fingerprint score gates, title/artist threshold
gates, defensive paths.
"""

from __future__ import annotations

import pytest

from core.matching.version_mismatch import is_acceptable_version_mismatch


class TestEqualVersions:
    def test_same_version_trivially_accepted(self):
        # Equal version strings — no mismatch to decide. True.
        assert is_acceptable_version_mismatch(
            'live', 'live',
            fingerprint_score=0.0,
            title_similarity=0.0,
            artist_similarity=0.0,
        ) is True

    def test_both_original_accepted(self):
        assert is_acceptable_version_mismatch(
            'original', 'original',
            fingerprint_score=0.0,
            title_similarity=0.0,
            artist_similarity=0.0,
        ) is True


class TestOneSidedBareMismatch:
    """Issue #607 example 2: expected has annotation, AcoustID's MB
    record is bare. Accept when fingerprint + bare titles + artist
    all line up."""

    def test_live_vs_original_high_confidence_accepted(self):
        # Reporter's exact case: "Clarity (Live at ...)" vs "Clarity"
        assert is_acceptable_version_mismatch(
            'live', 'original',
            fingerprint_score=0.95,
            title_similarity=0.95,
            artist_similarity=1.0,
        ) is True

    def test_original_vs_live_high_confidence_accepted(self):
        # Same case in the other direction.
        assert is_acceptable_version_mismatch(
            'original', 'live',
            fingerprint_score=0.95,
            title_similarity=0.95,
            artist_similarity=1.0,
        ) is True

    def test_live_at_thresholds_accepted(self):
        # Exactly at the thresholds for the live-aware case.
        assert is_acceptable_version_mismatch(
            'live', 'original',
            fingerprint_score=0.85,
            title_similarity=0.70,
            artist_similarity=0.60,
        ) is True


class TestNonLiveOneSidedMismatchStaysStrict:
    """Other version markers (instrumental / remix / acoustic / etc)
    have distinct fingerprints AND MB always annotates them in the
    recording title. When AcoustID returns one of these for a bare
    expected (or vice versa), the file genuinely IS that version —
    the user asked for the wrong cut. Reject regardless of how high
    the supporting scores are.

    This narrowness is what keeps the existing
    test_acoustid_version_mismatch suite passing — instrumental
    vs vocal etc. stays a real mismatch."""

    def test_remix_vs_original_rejected_at_high_confidence(self):
        assert is_acceptable_version_mismatch(
            'remix', 'original',
            fingerprint_score=0.99,
            title_similarity=0.99,
            artist_similarity=0.99,
        ) is False

    def test_instrumental_vs_original_rejected_at_high_confidence(self):
        # The exact case test_acoustid_version_mismatch.py:
        # test_instrumental_returned_for_vocal_request_fails pins —
        # vocal asked, instrumental returned, must FAIL.
        assert is_acceptable_version_mismatch(
            'instrumental', 'original',
            fingerprint_score=0.99,
            title_similarity=0.99,
            artist_similarity=0.99,
        ) is False

    def test_original_vs_instrumental_rejected_at_high_confidence(self):
        # Reverse direction: caller asked for vocal, file is
        # instrumental.
        assert is_acceptable_version_mismatch(
            'original', 'instrumental',
            fingerprint_score=0.99,
            title_similarity=0.99,
            artist_similarity=0.99,
        ) is False

    def test_acoustic_vs_original_rejected_at_high_confidence(self):
        assert is_acceptable_version_mismatch(
            'acoustic', 'original',
            fingerprint_score=0.99,
            title_similarity=0.99,
            artist_similarity=0.99,
        ) is False

    def test_demo_vs_original_rejected(self):
        assert is_acceptable_version_mismatch(
            'demo', 'original',
            fingerprint_score=0.99,
            title_similarity=0.99,
            artist_similarity=0.99,
        ) is False


class TestTwoSidedMismatchStaysStrict:
    """Both sides have version markers but they disagree. Real
    different-recording mismatch — must reject regardless of how
    high the other scores are."""

    def test_live_vs_remix_rejected_even_at_max(self):
        assert is_acceptable_version_mismatch(
            'live', 'remix',
            fingerprint_score=1.0,
            title_similarity=1.0,
            artist_similarity=1.0,
        ) is False

    def test_acoustic_vs_instrumental_rejected(self):
        assert is_acceptable_version_mismatch(
            'acoustic', 'instrumental',
            fingerprint_score=0.99,
            title_similarity=0.99,
            artist_similarity=0.99,
        ) is False

    def test_live_vs_acoustic_rejected(self):
        assert is_acceptable_version_mismatch(
            'live', 'acoustic',
            fingerprint_score=0.95,
            title_similarity=0.90,
            artist_similarity=1.0,
        ) is False


class TestThresholdGates:
    """One-sided + bare but one of the supporting signals is too weak.
    Reject — fall through to FAIL."""

    def test_low_fingerprint_score_rejected(self):
        # Fingerprint score below threshold. Don't trust it enough.
        assert is_acceptable_version_mismatch(
            'live', 'original',
            fingerprint_score=0.50,
            title_similarity=0.95,
            artist_similarity=1.0,
        ) is False

    def test_low_title_similarity_rejected(self):
        # Bare titles disagree → different songs, not just MB metadata gap.
        assert is_acceptable_version_mismatch(
            'live', 'original',
            fingerprint_score=0.95,
            title_similarity=0.30,
            artist_similarity=1.0,
        ) is False

    def test_low_artist_similarity_rejected(self):
        # Wrong artist — definitely not the same recording.
        assert is_acceptable_version_mismatch(
            'live', 'original',
            fingerprint_score=0.95,
            title_similarity=0.95,
            artist_similarity=0.20,
        ) is False

    def test_just_below_score_threshold_rejected(self):
        assert is_acceptable_version_mismatch(
            'live', 'original',
            fingerprint_score=0.849,  # default threshold 0.85
            title_similarity=0.95,
            artist_similarity=1.0,
        ) is False

    def test_just_below_title_threshold_rejected(self):
        assert is_acceptable_version_mismatch(
            'live', 'original',
            fingerprint_score=0.95,
            title_similarity=0.699,  # default threshold 0.70
            artist_similarity=1.0,
        ) is False

    def test_just_below_artist_threshold_rejected(self):
        assert is_acceptable_version_mismatch(
            'live', 'original',
            fingerprint_score=0.95,
            title_similarity=0.95,
            artist_similarity=0.599,  # default threshold 0.60
        ) is False


class TestCustomThresholds:
    def test_custom_score_threshold_accepts_when_loosened(self):
        assert is_acceptable_version_mismatch(
            'live', 'original',
            fingerprint_score=0.70,
            title_similarity=0.95,
            artist_similarity=1.0,
            score_threshold=0.65,
        ) is True

    def test_custom_score_threshold_rejects_when_tightened(self):
        assert is_acceptable_version_mismatch(
            'live', 'original',
            fingerprint_score=0.90,
            title_similarity=0.95,
            artist_similarity=1.0,
            score_threshold=0.95,
        ) is False