# Copyright (c) 2015 Ultimaker B.V.
# Uranium is released under the terms of the LGPLv3 or higher.

from PyQt5.QtCore import Qt, pyqtSlot, pyqtProperty, pyqtSignal

from UM.Application import Application
from UM.Qt.ListModel import ListModel
from UM.OutputDevice import OutputDeviceError

import time

##  A list model providing a list of all registered OutputDevice instances.
#
#   This list model wraps OutputDeviceManager's list of OutputDevice instances.
#   Additionally it provides a function to set OutputDeviceManager's active device.
#
#   Exposes the following roles:
#   * id - The device ID
#   * name - The human-readable name of the device
#   * short_description - The short description of the device
#   * description - The full description of the device
#   * icon_name - The name of the icon used to identify the device
#   * priority - The device priority
#
class OutputDevicesModel(ListModel):
    IdRole = Qt.UserRole + 1
    NameRole = Qt.UserRole + 2
    ShortDescriptionRole = Qt.UserRole + 3
    DescriptionRole = Qt.UserRole + 4
    IconNameRole = Qt.UserRole + 5
    PriorityRole = Qt.UserRole + 6

    def __init__(self, parent = None):
        super().__init__(parent)
        self._device_manager = Application.getInstance().getOutputDeviceManager()

        self.addRoleName(self.IdRole, "id")
        self.addRoleName(self.NameRole, "name")
        self.addRoleName(self.ShortDescriptionRole, "short_description")
        self.addRoleName(self.DescriptionRole, "description")
        self.addRoleName(self.IconNameRole, "icon_name")
        self.addRoleName(self.PriorityRole, "priority")

        self._device_manager.outputDevicesChanged.connect(self._update)
        self._update()

    @pyqtSlot(str, result = "QVariantMap")
    def getDevice(self, device_id):
        index = self.find("id", device_id)
        if index != -1:
            return self.getItem(index)

        return { "id": "", "name": "", "short_description": "", "description": "", "icon_name": "save", "priority": -1 }

    outputDevicesChanged = pyqtSignal()

    @pyqtProperty(int, notify = outputDevicesChanged)
    def deviceCount(self):
        return self.rowCount()

    def _update(self):
        self.beginResetModel()

        self._items.clear()
        devices = self._device_manager.getOutputDevices()
        for device in devices:
            self._items.append({
                "id": device.getId(),
                "name": device.getName(),
                "short_description": device.getShortDescription(),
                "description": device.getDescription(),
                "icon_name": device.getIconName(),
                "priority": device.getPriority()
            })

        self.sort(lambda i: -i["priority"])
        self.endResetModel()

        self.outputDevicesChanged.emit()
