from lyra_worker.adapters.fakes import FakeMbBrowser
from lyra_worker.browser import ReleaseGroupInfo
from lyra_worker.scan import scan_chunk
from lyra_worker.types import MBTarget
from tests.test_scan import FakeProbe, FakeResolver, _album, _counts


def _tree(tmp_path):
    """Three albums across two artists, in nested-sorted order:
    Artist A/Alpha, Artist A/Beta, Artist B/Gamma."""
    _album(tmp_path, "Artist A", "Alpha (2001)")
    _album(tmp_path, "Artist A", "Beta (2002)")
    _album(tmp_path, "Artist B", "Gamma (2003)")
    resolver = FakeResolver({
        ("Artist A", "Alpha"): MBTarget(artist="Artist A", album="Alpha", year=2001, rg_mbid="rg-a1", artist_mbid="ma"),
        ("Artist A", "Beta"): MBTarget(artist="Artist A", album="Beta", year=2002, rg_mbid="rg-a2", artist_mbid="ma"),
        ("Artist B", "Gamma"): MBTarget(artist="Artist B", album="Gamma", year=2003, rg_mbid="rg-b1", artist_mbid="mb"),
    })
    browser = FakeMbBrowser(releases={
        "ma": [ReleaseGroupInfo("rg-a1", "Alpha", "Album", (), "2001"),
               ReleaseGroupInfo("rg-a2", "Beta", "Album", (), "2002")],
        "mb": [ReleaseGroupInfo("rg-b1", "Gamma", "Album", (), "2003")],
    })
    return resolver, browser


def test_scan_chunk_respects_limit_and_returns_cursor(conn, tmp_path):
    resolver, browser = _tree(tmp_path)
    cursor, imported, skipped, done = scan_chunk(
        conn, resolver, FakeProbe(quality_class=2), browser, str(tmp_path), cursor="", limit=2)
    assert (imported, skipped, done) == (2, 0, False)  # processed 2 of 3, more remain
    assert cursor == "Artist A/Beta (2002)"            # last processed key
    with conn.cursor() as cur:
        cur.execute('SELECT count(*) FROM "LibraryItem"')
        assert cur.fetchone()[0] == 2


def test_scan_chunk_resumes_from_cursor(conn, tmp_path):
    resolver, browser = _tree(tmp_path)
    cursor, imported, skipped, done = scan_chunk(
        conn, resolver, FakeProbe(quality_class=2), browser, str(tmp_path),
        cursor="Artist A/Beta (2002)", limit=25)
    assert (imported, skipped, done) == (1, 0, True)   # only Gamma remains
    assert cursor == "Artist B/Gamma (2003)"
    with conn.cursor() as cur:
        cur.execute('SELECT album FROM "LibraryItem"')
        assert cur.fetchall() == [("Gamma",)]          # only Gamma imported


def test_scan_chunk_cursor_past_end_is_noop(conn, tmp_path):
    resolver, browser = _tree(tmp_path)
    cursor, imported, skipped, done = scan_chunk(
        conn, resolver, FakeProbe(), browser, str(tmp_path), cursor="zzzz/zzzz", limit=10)
    assert (imported, skipped, done) == (0, 0, True)
    assert cursor == "zzzz/zzzz"                        # unchanged
    assert _counts(conn)["LibraryItem"] == 0


def test_scan_chunk_splits_artist_across_chunks_idempotently(conn, tmp_path):
    # limit=1 forces Artist A's two albums into separate chunks, re-browsing its
    # discography — which must stay idempotent (ON CONFLICT) and total the same as one scan.
    resolver, browser = _tree(tmp_path)
    cursor, done, total_i, total_s, guard = "", False, 0, 0, 0
    while not done and guard < 10:
        cursor, i, s, done = scan_chunk(
            conn, resolver, FakeProbe(quality_class=2), browser, str(tmp_path), cursor=cursor, limit=1)
        total_i += i
        total_s += s
        guard += 1
    assert (total_i, total_s) == (3, 0)
    assert guard == 3  # three albums, one per chunk, then done
    assert _counts(conn) == {"LibraryItem": 3, "MonitoredRelease": 3, "WatchedArtist": 2}


def test_scan_chunk_unbounded_matches_full_walk(conn, tmp_path):
    resolver, browser = _tree(tmp_path)
    cursor, imported, skipped, done = scan_chunk(
        conn, resolver, FakeProbe(quality_class=2), browser, str(tmp_path), cursor="", limit=None)
    assert (imported, skipped, done) == (3, 0, True)
    assert cursor == "Artist B/Gamma (2003)"
    assert _counts(conn) == {"LibraryItem": 3, "MonitoredRelease": 3, "WatchedArtist": 2}