"""Finding files in the artists' folders that the library has no record of, and
importing them where they lie (services.library_scan + the `library` batch)."""

import io
import os
import time

import pytest
from PIL import Image
from sqlalchemy import select

import backend.app.tasks.import_file as import_file
from backend.app.models import Artist, ImageRecord, ImportSettings, ImportTask
from backend.app.services import library_scan
from backend.app.services.importer import Importer
from backend.app.services.thumbnailer import Thumbnailer

pytestmark = pytest.mark.integration


def _jpeg(seed: int) -> bytes:
    im = Image.new("RGB", (256, 256))
    px = im.load()
    for y in range(256):
        for x in range(256):
            px[x, y] = ((x * seed) % 256, (y * (seed + 1)) % 256, (x ^ y) % 256)
    buf = io.BytesIO()
    im.save(buf, "JPEG")
    return buf.getvalue()


def _write(path, data: bytes, *, age_days: float = 2):
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_bytes(data)
    t = time.time() - age_days * 86400
    os.utime(path, (t, t))
    return path


@pytest.fixture
def layout(db_sync, tmp_path):
    db_sync.add(Artist(name="Libscan Maewix", slug="libscan-maewix"))
    db_sync.commit()
    post = tmp_path / "Libscan-Maewix" / "patreon" / "2026-05-01_123_Pack"
    files = {
        "missing": _write(post / "01_art.jpg", _jpeg(1)),
        "owned": _write(post / "02_owned.jpg", _jpeg(2)),
        "sidecar": _write(post / "01_art.json", b'{"category": "patreon", "id": "123"}'),
        "staging": _write(post / "03_big.zip.part", b"partial"),
        "recent": _write(post / "04_new.jpg", _jpeg(4), age_days=0),
        "not_media": _write(post / "05_game.exe", b"MZ"),
        "no_artist": _write(tmp_path / "libscan-nobody" / "x" / "a.jpg", _jpeg(5)),
        "store": _write(tmp_path / "thumbs" / "abc" / "f.jpg", _jpeg(6)),
    }
    db_sync.add(ImageRecord(
        path=str(files["owned"]), sha256="libscan-owned".ljust(64, "x"),
        size_bytes=files["owned"].stat().st_size, mime="image/jpeg",
        width=256, height=256, origin="downloaded", integrity_status="ok",
    ))
    db_sync.commit()
    return tmp_path, files


def test_finds_only_unrecorded_media_in_an_artists_folder(db_sync, layout):
    """A differently-cased folder still matches its artist. Recorded files,
    sidecars, staging files, the library's own stores, folders that match no
    artist, files changed in the last day and non-media are not listed."""
    root, files = layout
    found, summary = library_scan.find_unimported(db_sync, root)

    assert [u.path for u in found] == [files["missing"]]
    assert found[0].artist_slug == "libscan-maewix"
    assert found[0].task_type == "media"
    assert summary["files"] == 1
    assert summary["recent"] == 1
    assert summary["not_media"] == 1
    assert summary["no_artist"] == 1
    assert summary["artists"][0]["slug"] == "libscan-maewix"
    assert summary["artists"][0]["samples"] == [
        "Libscan-Maewix/patreon/2026-05-01_123_Pack/01_art.jpg",
    ]


def test_queue_makes_a_library_batch_of_what_find_lists(db_sync, layout, monkeypatch):
    """The import queued is exactly the previewed list."""
    root, files = layout
    queued = []
    monkeypatch.setattr(import_file, "enqueue_import", lambda tid, tt: queued.append((tid, tt)))

    summary = library_scan.queue_unimported(db_sync, root)

    tasks = db_sync.execute(
        select(ImportTask).where(ImportTask.batch_id == summary["batch_id"])
    ).scalars().all()
    assert [t.source_path for t in tasks] == [str(files["missing"])]
    assert tasks[0].batch.scan_mode == "library"
    assert queued == [(tasks[0].id, "media")]


def test_a_library_import_attaches_in_place_and_removes_a_copy(db_sync, layout, monkeypatch):
    """The file stays where it is and becomes the record's file. A byte-identical
    copy found later is removed from disk, since the library already holds it."""
    root, files = layout
    monkeypatch.setattr(import_file, "IMAGES_ROOT", root)
    importer = Importer(
        session=db_sync, images_root=root, import_root=root,
        thumbnailer=Thumbnailer(images_root=root),
        settings=ImportSettings.load_sync(db_sync),
    )

    result = import_file._attach_where_it_lies(db_sync, importer, files["missing"])

    assert result.status == "imported"
    record = db_sync.get(ImageRecord, result.image_id)
    assert record.path == str(files["missing"])
    assert files["missing"].exists()
    assert db_sync.get(Artist, record.artist_id).slug == "libscan-maewix"

    copy = _write(files["missing"].parent / "09_copy.jpg", files["missing"].read_bytes())
    again = import_file._attach_where_it_lies(db_sync, importer, copy)
    assert again.status == "skipped"
    assert not copy.exists()
    assert files["missing"].exists()