"""Round 9: three 'Open / future' items.

1. New playlist is selected and drops straight into inline rename
   (PlaylistTree.create_playlist_interactive).
2. EQ visualizer cycles on / dim / off on click (off goes blank).
3. Album-art recovery plumbing: the .itc cache decoder (lintunes.itc).
"""

from PyQt6.QtCore import QObject, pyqtSignal
from PyQt6.QtWidgets import QAbstractItemView

from lintunes.models import Library, Track
from lintunes.library_manager import LibraryManager
from lintunes.gui.sidebar import PlaylistTree
from lintunes.gui.visualizer import VisualizerWidget, BANDS
from lintunes.itc import decode_itc


def _manager(tmp_path):
    library = Library(tracks={1: Track(track_id=1, name="One")})
    return LibraryManager(library, tmp_path)


# --------------------------------------------------------------------------
# 1. New playlist: instant select + live inline rename
# --------------------------------------------------------------------------

class TestCreatePlaylistInteractive:
    def test_new_playlist_is_selected_and_editing(self, qapp, tmp_path):
        manager = _manager(tmp_path)
        tree = PlaylistTree(manager)

        tree.create_playlist_interactive()

        playlists = list(manager.library.playlists.values())
        assert len(playlists) == 1
        new = playlists[0]
        assert new.name == "untitled playlist"
        # Selected...
        assert tree.current_playlist_id() == new.persistent_id
        # ...and the inline editor is open so typing renames it immediately.
        assert tree.state() == QAbstractItemView.State.EditingState

    def test_committing_the_edit_renames_via_manager(self, qapp, tmp_path):
        manager = _manager(tmp_path)
        tree = PlaylistTree(manager)
        tree.create_playlist_interactive()
        pid = tree.current_playlist_id()

        # Simulate the user typing a name and the editor committing: the
        # itemChanged -> _on_item_renamed -> rename_playlist wiring fires.
        item = tree._find_item(pid)
        item.setText(0, "Road Trip")

        assert manager.library.playlists[pid].name == "Road Trip"


# --------------------------------------------------------------------------
# 2. EQ visualizer blank-when-off
# --------------------------------------------------------------------------

class _FakePlayer(QObject):
    audio_buffer = pyqtSignal(object)
    playing_changed = pyqtSignal(bool)
    track_changed = pyqtSignal(object)

    def __init__(self):
        super().__init__()
        self._playing = False

    def is_playing(self):
        return self._playing


class TestVisualizerToggle:
    def test_click_cycles_on_dim_off(self, qapp):
        from lintunes.gui.visualizer import MODE_ON, MODE_DIM, MODE_OFF
        player = _FakePlayer()
        player._playing = True
        vis = VisualizerWidget(player)

        assert vis._mode == MODE_ON
        vis.mousePressEvent(None)  # on -> dim
        assert vis._mode == MODE_DIM
        vis.mousePressEvent(None)  # dim -> off
        assert vis._mode == MODE_OFF
        vis.mousePressEvent(None)  # off -> on (wraps)
        assert vis._mode == MODE_ON

    def test_off_goes_blank_and_stops(self, qapp):
        from lintunes.gui.visualizer import MODE_OFF
        player = _FakePlayer()
        player._playing = True
        vis = VisualizerWidget(player)
        vis._bars = [7] * BANDS  # pretend mid-animation

        vis.mousePressEvent(None)  # on -> dim
        vis.mousePressEvent(None)  # dim -> off

        assert vis._mode == MODE_OFF
        assert vis._bars == [0] * BANDS          # blank, not the held frame
        assert not vis._levels.any()
        assert not vis._timer.isActive()         # stopped

    def test_dim_keeps_animating_when_playing(self, qapp):
        from lintunes.gui.visualizer import MODE_DIM
        player = _FakePlayer()
        player._playing = True
        vis = VisualizerWidget(player)

        vis.mousePressEvent(None)  # on -> dim

        assert vis._mode == MODE_DIM
        assert vis._timer.isActive()  # dim animates while playing

    def test_cycling_back_on_resumes_when_playing(self, qapp):
        from lintunes.gui.visualizer import MODE_ON
        player = _FakePlayer()
        player._playing = True
        vis = VisualizerWidget(player)

        vis.mousePressEvent(None)  # on -> dim
        vis.mousePressEvent(None)  # dim -> off
        vis.mousePressEvent(None)  # off -> on again

        assert vis._mode == MODE_ON
        assert vis._timer.isActive()


# --------------------------------------------------------------------------
# 3. .itc artwork-cache decoder
# --------------------------------------------------------------------------

def _itc_header():
    # A minimal iTunes .itc-style header preamble; decode_itc only cares that
    # the real image magic appears after it.
    return bytes([0, 0, 1, 0x1c]) + b"itch" + b"\x00" * 8 + b"artw" + \
        b"\x00" * 8 + b"item" + b"\x00" * 8


class TestItcDecoder:
    def test_extracts_jpeg(self):
        image = b"\xff\xd8\xff\xe0" + b"JFIFpayload" + b"\xff\xd9"
        blob = _itc_header() + image + b"\x00\x00trailing"
        out = decode_itc(blob)
        assert out is not None
        data, mime = out
        assert mime == "image/jpeg"
        assert data == image                     # trimmed to EOI, trailing dropped

    def test_extracts_png(self):
        sig = b"\x89PNG\r\n\x1a\n"
        image = sig + b"IHDRfakechunks" + b"IEND\xae\x42\x60\x82"
        blob = _itc_header() + image + b"junk"
        out = decode_itc(blob)
        assert out is not None
        data, mime = out
        assert mime == "image/png"
        assert data == image

    def test_raw_bitmap_is_unsupported(self):
        # ARGb/PNGf raw payloads have no JPEG/PNG magic -> can't recover.
        blob = _itc_header() + b"ARGb" + bytes(range(64))
        assert decode_itc(blob) is None