# -*- coding: utf-8 -*-
# Copyright 2012 Christoph Reiter
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.

from gi.repository import Gst, Gtk, GObject

from quodlibet import _
from quodlibet.plugins import PluginImportException
from quodlibet.plugins.gstelement import GStreamerPlugin
from quodlibet import qltk
from quodlibet import config
from quodlibet.qltk import Icons

_PLUGIN_ID = "karaoke"

_SETTINGS = {
    "band": [_("Filter _band:"),
             _("The Frequency band of the filter"), 220.0],
    "width": [_("Filter _width:"),
              _("The Frequency width of the filter"), 100.0],
    "level": [_("_Level:"), _("Level of the effect"), 1.0],
}


def get_cfg(option):
    cfg_option = "%s_%s" % (_PLUGIN_ID, option)
    default = _SETTINGS[option][2]
    return config.getfloat("plugins", cfg_option, default)


def set_cfg(option, value):
    cfg_option = "%s_%s" % (_PLUGIN_ID, option)
    if get_cfg(option) != value:
        config.set("plugins", cfg_option, value)


class Preferences(Gtk.VBox):
    __gsignals__ = {
        'changed': (GObject.SignalFlags.RUN_LAST, None, tuple()),
    }

    def __init__(self):
        super(Preferences, self).__init__(spacing=12)

        table = Gtk.Table(n_rows=3, n_columns=2)
        table.set_col_spacings(6)
        table.set_row_spacings(6)

        labels = {}
        for idx, key in enumerate(["level", "band", "width"]):
            label = Gtk.Label(label=_SETTINGS[key][0])
            labels[key] = label
            label.set_alignment(0.0, 0.5)
            label.set_padding(0, 6)
            label.set_tooltip_text(_SETTINGS[key][1])
            label.set_use_underline(True)
            table.attach(label, 0, 1, idx, idx + 1,
                         xoptions=Gtk.AttachOptions.FILL |
                         Gtk.AttachOptions.SHRINK)

        def scale_changed(scale, option):
            value = scale.get_value()
            set_cfg(option, value)
            self.emit("changed")

        max_values = [1.0, 441, 100]
        steps = [0.01, 10, 10]
        pages = [0.1, 50, 25]

        scales = {}
        for idx, key in enumerate(["level", "band", "width"]):
            max_value = max_values[idx]
            step = steps[idx]
            page = pages[idx]
            scale = Gtk.HScale(
                adjustment=Gtk.Adjustment.new(0, 0, max_value, step, page, 0))
            scales[key] = scale
            if step < 0.1:
                scale.set_digits(2)
            scale.add_mark(_SETTINGS[key][2], Gtk.PositionType.BOTTOM, None)
            labels[key].set_mnemonic_widget(scale)
            scale.set_value_pos(Gtk.PositionType.RIGHT)
            table.attach(scale, 1, 2, idx, idx + 1)
            scale.connect('value-changed', scale_changed, key)
            scale.set_value(get_cfg(key))

        def format_perc(scale, value):
            return _("%d %%") % (value * 100)
        scales["level"].connect('format-value', format_perc)

        def format_hertz(scale, value):
            return _("%d Hz") % value
        scales["band"].connect('format-value', format_hertz)
        scales["width"].connect('format-value', format_hertz)

        self.pack_start(qltk.Frame(_("Preferences"), child=table),
                        True, True, 0)


class Karaoke(GStreamerPlugin):
    PLUGIN_ID = _PLUGIN_ID
    PLUGIN_NAME = _("Karaoke")
    PLUGIN_DESC = _("Removes main vocals from audio.")
    PLUGIN_ICON = Icons.AUDIO_INPUT_MICROPHONE

    @classmethod
    def setup_element(cls):
        return Gst.ElementFactory.make('audiokaraoke', cls.PLUGIN_ID)

    @classmethod
    def update_element(cls, element):
        element.set_property("level", get_cfg("level"))
        element.set_property("filter-band", get_cfg("band"))
        element.set_property("filter-width", get_cfg("width"))

    @classmethod
    def PluginPreferences(cls, window):
        prefs = Preferences()
        prefs.connect("changed", lambda *x: cls.queue_update())
        return prefs


if not Karaoke.setup_element():
    raise PluginImportException(
        "GStreamer element 'audiokaraoke' missing (gst-plugins-good)")
