#!/usr/bin/python3

# nitroplasm: a lightweight desktop setter for KDE Plasma
# by Derek Stevens <nilix@nilfm.cc>
# written for use with the custom root menu by MatMoul:
# https://github.com/MatMoul/plasma-containmentactions-customdesktopmenu
# original script by pashazz:
# https://github.com/pashazz/ksetwallpaper
# license: GPLv3

from PyQt5 import QtGui, QtCore
from PyQt5.QtWidgets import \
  QApplication, \
  QWidget, \
  QComboBox, \
  QVBoxLayout, \
  QHBoxLayout, \
  QPushButton, \
  QFileDialog , \
  QLabel, \
  QSizePolicy
import sys
from PyQt5.QtGui import QPixmap
import subprocess
import dbus
import argparse

class Window(QWidget):
  def __init__(self):
    super().__init__()  

    self.title = "Nitroplasm"
    self.top = 100
    self.left = 200
    self.width = 500
    self.height = 400

    self.InitWindow()

  def InitWindow(self):
    self.setWindowIcon(QtGui.QIcon(None))
    self.setWindowTitle(self.title)
    self.setGeometry(self.left, self.top, self.width, self.height)
    self.setFixedSize(self.width, self.height)
    self.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)
    self.setWindowFlags(QtCore.Qt.Dialog)

    vbox = QVBoxLayout()
    hbox = QHBoxLayout()

    self.image = None
    self.label = QLabel(self.image)
    self.label.setScaledContents(False)
    self.label.setAlignment(QtCore.Qt.AlignCenter)
    self.label.setSizePolicy(QSizePolicy.Ignored, QSizePolicy.Ignored)
    self.layout = 2
    self.monitor = -1
    
    self.select_button = QPushButton("Select Image")
    self.select_button.clicked.connect(self.get_image)

    layouts = {
      "Stretch": 0,
      "Scale": 1,
      "Zoom": 2,
      "Tile": 3,
      "Vertical Tile": 4,
      "Horizontal Tile": 5,
      "Center": 6
    }
    
    self.layout_selector = QComboBox()
    for l in layouts:
      self.layout_selector.addItem(l, layouts[l])
    self.layout_selector.currentIndexChanged.connect(self.set_layout)
    self.layout_selector.setCurrentIndex(2)

    self.monitor_selector = QComboBox()
    self.monitor_selector.addItem("All Monitors", -1)
    nDisplays = self.get_displays()
    print(nDisplays)
    if nDisplays > 1:
      for i in range(0, nDisplays):
        self.monitor_selector.addItem("Monitor" + str(i+1), i)
    self.monitor_selector.currentIndexChanged.connect(self.set_monitor)
    self.monitor_selector.setCurrentIndex(0)

    self.apply_button = QPushButton("Apply Image")
    self.apply_button.setEnabled(False)
    self.apply_button.clicked.connect(self.apply_image)

    vbox.addWidget(self.label)

    hbox.addWidget(self.select_button)
    hbox.addWidget(self.layout_selector)
    hbox.addWidget(self.monitor_selector)
    hbox.addWidget(self.apply_button)

    vbox.addLayout(hbox)
    self.setLayout(vbox)
    self.show()
    
  def set_layout(self, index):
    self.layout = self.layout_selector.itemData(index)

  def get_displays(self):
    try:
      output = [l for l in subprocess.check_output(["xrandr"]).decode("utf-8").splitlines()]
      return len([l.split()[0] for l in output if " connected " in l])
    except:
      return 1


  def set_monitor(self, index):
    self.monitor = self.monitor_selector.itemData(index)

  def get_image(self):
    fname = QFileDialog.getOpenFileName(
      self,
      'Select Image File',
      './',
      'Image files (*.png *.jpg *.gif *.jpeg)')

    if fname[0]:
      self.image = fname[0]
      self.apply_button.setEnabled(True)

    pixmap = QPixmap(self.image).scaled(
      self.label.width(),
      self.label.height(),
      QtCore.Qt.KeepAspectRatio,
      QtCore.Qt.SmoothTransformation)

    #self.label.setMaximumSize(self.label.width(), self.label.height())
    self.label.setPixmap(pixmap)

  def set_wallpaper(self, filepath, plugin = 'org.kde.image', layout = 2, desk = -1):
    if desk < 0:
      jscript = """
        var allDesktops = desktops();
        for (i=0;i<allDesktops.length;i++) {
          d = allDesktops[i];
          d.wallpaperPlugin = "%s";
          d.currentConfigGroup = Array("Wallpaper", "%s", "General");
          d.writeConfig("Image", "file://%s")
          d.writeConfig("FillMode", "%s")
        }
        """
    else:
      jscript = """
        var d = desktops()[%s];
        d.wallpaperPlugin = "%s";
        d.currentConfigGroup = Array("Wallpaper", "%s", "General");
        d.writeConfig("Image", "file://%s")
        d.writeConfig("FillMode", "%s")
        """

    bus = dbus.SessionBus()
    plasma = dbus.Interface(
      bus.get_object(
        'org.kde.plasmashell',
        '/PlasmaShell'),
     dbus_interface='org.kde.PlasmaShell')
    if desk < 0:
      plasma.evaluateScript(jscript % (plugin, plugin, filepath, layout))
    else:
      plasma.evaluateScript(jscript % (desk, plugin, plugin, filepath, layout))
    
  def apply_image(self):
    self.set_wallpaper(self.image, 'org.kde.image', self.layout, self.monitor)

if __name__ == '__main__':
  if len(sys.argv) == 1:
    App = QApplication(sys.argv)
    window = Window()
    sys.exit(App.exec())
  else:
    parser = argparse.ArgumentParser(description='KDE Wallpaper setter')