"""MusicBrainz picks an arbitrary releases[0] that is often a deluxe/expanded edition with more
tracks (and a longer runtime) than the standard album a source legitimately delivers. Completeness
and the duration guard must be judged against what the CHOSEN SOURCE offered, not MB's canonical
edition — otherwise a complete standard-edition download is falsely rejected as 'incomplete'
(The Script "No Sound Without Silence": 11 delivered vs MB 12) or 'too short' (Skillet "Unleashed":
12 delivered ~40 min vs MB's 20-track deluxe ~73 min). A genuinely short download must still fail.
"""
import os
from dataclasses import replace

from lyra_worker.adapters.fakes import FakeQobuz
from lyra_worker.claim import claim_next
from lyra_worker.pipeline import run_pipeline
from lyra_worker.types import DownloadResult, MBTarget
from tests.conftest import insert_request


class _StandardEditionQobuz(FakeQobuz):
    """Qobuz-like source offering a fixed-size *standard* edition (source_tracks), independent of
    MB's possibly-larger deluxe count; stages that many real (non-empty) files and reports them."""
    def __init__(self, source_tracks):
        super().__init__()
        self._n = source_tracks

    def search(self, target):
        return super().search(replace(target, track_count=self._n))

    def download(self, candidate, dest, on_progress):
        os.makedirs(dest, exist_ok=True)
        for i in range(candidate.track_count):
            with open(os.path.join(dest, f"{i + 1:02d} Track.flac"), "wb") as fh:
                fh.write(b"audio")
        on_progress(1.0)
        return DownloadResult(ok=True, path=dest, track_count=candidate.track_count)


class _PartialQobuz(FakeQobuz):
    """Promises `promised` tracks but one fails mid-download: stages and reports `promised - 1`
    (the real John Mayer "Roll it on Home" IncompleteRead case)."""
    def __init__(self, promised):
        super().__init__()
        self._n = promised

    def search(self, target):
        return super().search(replace(target, track_count=self._n))

    def download(self, candidate, dest, on_progress):
        os.makedirs(dest, exist_ok=True)
        delivered = candidate.track_count - 1
        for i in range(delivered):
            with open(os.path.join(dest, f"{i + 1:02d} Track.flac"), "wb") as fh:
                fh.write(b"audio")
        return DownloadResult(ok=True, path=dest, track_count=delivered)


class _DeluxeResolver:
    """Resolver whose canonical release is a larger (deluxe) edition than the source delivers."""
    def __init__(self, mb_tracks, mb_total_s):
        self._t, self._s = mb_tracks, mb_total_s

    def resolve(self, artist, album):
        return MBTarget(artist=artist, album=album, track_count=self._t, total_duration_s=self._s)


def _state_error(conn, job_id):
    with conn.cursor() as cur:
        cur.execute('SELECT state, error FROM "Job" WHERE id = %s', (job_id,))
        return cur.fetchone()


def test_standard_edition_not_rejected_as_incomplete(conn):
    # The Script: source delivers the 11-track standard edition; MB's canonical release is 12.
    job_id = insert_request(conn, artist="The Script", album="No Sound Without Silence")
    claim_next(conn)
    run_pipeline(conn, job_id, [_StandardEditionQobuz(source_tracks=11)],
                 resolver=_DeluxeResolver(mb_tracks=12, mb_total_s=2943),
                 measure_duration=lambda _s: 2700.0, dest_root="/tmp/lib-se")
    assert _state_error(conn, job_id) == ("imported", None)


def test_smaller_edition_not_rejected_as_too_short(conn):
    # Skillet: source delivers the 12-track standard (~40 min); MB's release is a 20-track deluxe
    # (~73 min). The unscaled duration guard falsely rejects; scaling to the delivered edition
    # (12/20) must let it pass.
    job_id = insert_request(conn, artist="Skillet", album="Unleashed")
    claim_next(conn)
    run_pipeline(conn, job_id, [_StandardEditionQobuz(source_tracks=12)],
                 resolver=_DeluxeResolver(mb_tracks=20, mb_total_s=4380),
                 measure_duration=lambda _s: 2400.0, dest_root="/tmp/lib-se")
    assert _state_error(conn, job_id) == ("imported", None)


def test_genuinely_incomplete_still_rejected(conn):
    # John Mayer: the source promised 12 tracks but one failed mid-download → only 11 land.
    # This is a real partial and must still be rejected (the fix must not swallow it).
    job_id = insert_request(conn, artist="John Mayer", album="The Search for Everything")
    claim_next(conn)
    run_pipeline(conn, job_id, [_PartialQobuz(promised=12)],
                 resolver=_DeluxeResolver(mb_tracks=12, mb_total_s=2580),
                 measure_duration=lambda _s: 2400.0, dest_root="/tmp/lib-se")
    assert _state_error(conn, job_id) == ("needs_attention", "incomplete download")