from lyra_worker import main
from lyra_worker.adapters.fakes import FakeMbBrowser, FakeSimilaritySource
from lyra_worker.discovery import DiscoveryConfig, DiscoveryResult
from lyra_worker.main import maybe_run_discovery
from lyra_worker.similarity.base import SimilarArtist
from tests.conftest import insert_watched_artist


def _set(conn, key, value):
    with conn.cursor() as cur:
        cur.execute(
            'INSERT INTO "Config"(key, value, secret, "updatedAt") VALUES (%s, %s, false, now()) '
            'ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, "updatedAt" = now()',
            (key, value),
        )
    conn.commit()


def _get(conn, key):
    with conn.cursor() as cur:
        cur.execute('SELECT value FROM "Config" WHERE key = %s', (key,))
        row = cur.fetchone()
        return row[0] if row else None


def test_maybe_run_discovery_drains_across_chunks_and_finishes(conn):
    # The sweep must advance one chunk (discover.chunkSize seeds) per call, clear
    # discover.requested exactly once at start, and finally drain on the 0-seed chunk:
    # writing discover.result and clearing discover.inProgress.
    for i in range(3):
        insert_watched_artist(conn, mbid=f"s{i}", name=f"Seed{i}")
    _set(conn, "discover.requested", "true")
    _set(conn, "discover.chunkSize", "2")
    src = FakeSimilaritySource(
        similar={f"s{i}": [SimilarArtist(f"c{i}", f"C{i}", 0.9)] for i in range(3)}
    )
    cfg = {"discover.enabled": "false", "discover.requested": "true", "discover.chunkSize": "2"}
    tick = 0.0
    # iteration 1: starts sweep, processes 2 seeds, still in progress
    tick = maybe_run_discovery(
        conn, [src], FakeMbBrowser(), cfg, DiscoveryConfig.from_config(cfg), 1.0, tick
    )
    assert _get(conn, "discover.inProgress") == "true"
    assert _get(conn, "discover.requested") == "false"   # cleared at sweep start
    # refresh the snapshot the way run_forever's loop does (re-reads config each iteration)
    cfg2 = {**cfg, "discover.requested": "false", "discover.inProgress": "true",
            "discover.progress": _get(conn, "discover.progress")}
    # iteration 2: processes the last seed, still in progress
    maybe_run_discovery(
        conn, [src], FakeMbBrowser(), cfg2, DiscoveryConfig.from_config(cfg2), 2.0, tick
    )
    assert _get(conn, "discover.inProgress") == "true"
    cfg3 = {**cfg2, "discover.progress": _get(conn, "discover.progress")}
    # iteration 3: 0 seeds left -> drains, writes result, clears inProgress
    maybe_run_discovery(
        conn, [src], FakeMbBrowser(), cfg3, DiscoveryConfig.from_config(cfg3), 3.0, tick
    )
    assert _get(conn, "discover.inProgress") == "false"
    assert _get(conn, "discover.progress") == ""
    assert "artists" in (_get(conn, "discover.result") or "")


def test_maybe_run_discovery_runs_once_when_due_and_requested(conn, monkeypatch):
    # A scheduled tick that is due AND a pending one-shot request in the same loop
    # iteration must trigger discovery exactly once, not twice.
    calls = []
    monkeypatch.setattr(main, "_run_discovery",
                        lambda *a, **k: (calls.append(1), DiscoveryResult(0, 0, seeds=0))[1])
    config = {"discover.enabled": "true", "discover.requested": "true"}
    dcfg = DiscoveryConfig.from_config(config)
    new_tick = maybe_run_discovery(
        conn, [], FakeMbBrowser(), config, dcfg, now=10_000.0, last_discover_tick=0.0
    )
    assert calls == [1]           # exactly one run
    assert new_tick == 10_000.0   # schedule tick advanced


def test_maybe_run_discovery_requested_when_disabled_does_not_advance_tick(conn, monkeypatch):
    # A one-shot request runs even when discovery is disabled, but must not advance the
    # schedule tick (there is no active schedule).
    calls = []
    monkeypatch.setattr(main, "_run_discovery",
                        lambda *a, **k: (calls.append(1), DiscoveryResult(0, 0, seeds=0))[1])
    config = {"discover.enabled": "false", "discover.requested": "true"}
    dcfg = DiscoveryConfig.from_config(config)
    new_tick = maybe_run_discovery(
        conn, [], FakeMbBrowser(), config, dcfg, now=10_000.0, last_discover_tick=42.0
    )
    assert calls == [1]
    assert new_tick == 42.0        # unchanged


def test_maybe_run_discovery_idle_does_nothing(conn, monkeypatch):
    calls = []
    monkeypatch.setattr(main, "_run_discovery",
                        lambda *a, **k: (calls.append(1), DiscoveryResult(0, 0, seeds=0))[1])
    config = {"discover.enabled": "true", "discover.requested": "false"}
    dcfg = DiscoveryConfig.from_config(config)
    # enabled but not yet due (tick was recent relative to now)
    new_tick = maybe_run_discovery(
        conn, [], FakeMbBrowser(), config, dcfg, now=100.0, last_discover_tick=99.0
    )
    assert calls == []
    assert new_tick == 99.0