"""quality_tier_for_source — derive a source's requested download tier from
the GLOBAL quality profile instead of a per-source setting.

Rule: pick the LOWEST source tier that satisfies the user's top (most
preferred) target — respecting the user's quality ceiling and saving
bandwidth — or the source's max tier when none can satisfy it (best effort).
"""

import pytest

import core.quality.source_map as sm
from core.quality.model import QualityTarget


def _patch_targets(monkeypatch, targets, fallback=True):
    monkeypatch.setattr(sm, 'load_profile_targets', lambda: (targets, fallback))


T_FLAC24_96 = [QualityTarget(label='', format='flac', bit_depth=24, min_sample_rate=96000)]
T_FLAC24_192 = [QualityTarget(label='', format='flac', bit_depth=24, min_sample_rate=192000)]
T_FLAC16 = [QualityTarget(label='', format='flac', bit_depth=16)]
T_MP3_320 = [QualityTarget(label='', format='mp3', min_bitrate=320)]


def test_tidal_hires_when_top_wants_24_96(monkeypatch):
    _patch_targets(monkeypatch, T_FLAC24_96)
    assert sm.quality_tier_for_source('tidal') == 'hires'


def test_tidal_lossless_respects_16bit_ceiling(monkeypatch):
    # User caps at 16-bit → request lossless, NOT hires (saves bandwidth).
    _patch_targets(monkeypatch, T_FLAC16)
    assert sm.quality_tier_for_source('tidal') == 'lossless'


def test_tidal_best_effort_max_when_unsatisfiable(monkeypatch):
    # Source maxes at 24/96 but user wants 24/192 → best effort = max tier.
    _patch_targets(monkeypatch, T_FLAC24_192)
    assert sm.quality_tier_for_source('tidal') == 'hires'


def test_no_targets_requests_max(monkeypatch):
    _patch_targets(monkeypatch, [])
    assert sm.quality_tier_for_source('tidal') == 'hires'
    assert sm.quality_tier_for_source('deezer') == 'flac'


def test_deezer_flac_and_mp3(monkeypatch):
    _patch_targets(monkeypatch, T_FLAC16)
    assert sm.quality_tier_for_source('deezer') == 'flac'
    _patch_targets(monkeypatch, T_MP3_320)
    assert sm.quality_tier_for_source('deezer') == 'mp3_320'


def test_qobuz_hires_max(monkeypatch):
    _patch_targets(monkeypatch, T_FLAC24_192)
    assert sm.quality_tier_for_source('qobuz') == 'hires_max'


def test_unknown_source_returns_default(monkeypatch):
    _patch_targets(monkeypatch, T_FLAC16)
    assert sm.quality_tier_for_source('nope', default='x') == 'x'