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from PySide6.QtBluetooth import (QBluetoothDeviceDiscoveryAgent,
                                 QBluetoothDeviceInfo)
from PySide6.QtQml import QmlElement
from PySide6.QtCore import QTimer, Property, Signal, Slot

from bluetoothbaseclass import BluetoothBaseClass
from deviceinfo import DeviceInfo
from heartrate_global import simulator

# To be used on the @QmlElement decorator
# (QML_IMPORT_MINOR_VERSION is optional)
QML_IMPORT_NAME = "Shared"
QML_IMPORT_MAJOR_VERSION = 1


@QmlElement
class DeviceFinder(BluetoothBaseClass):

    scanningChanged = Signal()
    devicesChanged = Signal()

    def __init__(self, handler, parent=None):
        super().__init__(parent)
        self.m_deviceHandler = handler
        self.m_devices = []
        self.m_demoTimer = QTimer()
#! [devicediscovery-1]
        self.m_deviceDiscoveryAgent = QBluetoothDeviceDiscoveryAgent(self)
        self.m_deviceDiscoveryAgent.setLowEnergyDiscoveryTimeout(15000)
        self.m_deviceDiscoveryAgent.deviceDiscovered.connect(self.addDevice)
        self.m_deviceDiscoveryAgent.errorOccurred.connect(self.scanError)

        self.m_deviceDiscoveryAgent.finished.connect(self.scanFinished)
        self.m_deviceDiscoveryAgent.canceled.connect(self.scanFinished)
#! [devicediscovery-1]
        if simulator:
            self.m_demoTimer.setSingleShot(True)
            self.m_demoTimer.setInterval(2000)
            self.m_demoTimer.timeout.connect(self.scanFinished)

    @Slot()
    def startSearch(self):
        self.clearMessages()
        self.m_deviceHandler.setDevice(None)
        self.m_devices.clear()

        self.devicesChanged.emit()

        if simulator:
            self.m_demoTimer.start()
        else:
#! [devicediscovery-2]
            self.m_deviceDiscoveryAgent.start(QBluetoothDeviceDiscoveryAgent.LowEnergyMethod)
#! [devicediscovery-2]
            self.scanningChanged.emit()
        self.info = "Scanning for devices..."

#! [devicediscovery-3]
    @Slot(QBluetoothDeviceInfo)
    def addDevice(self, device):
        # If device is LowEnergy-device, add it to the list
        if device.coreConfigurations() & QBluetoothDeviceInfo.LowEnergyCoreConfiguration:
            self.m_devices.append(DeviceInfo(device))
            self.info = "Low Energy device found. Scanning more..."
#! [devicediscovery-3]
            self.devicesChanged.emit()
#! [devicediscovery-4]
    #...
#! [devicediscovery-4]

    @Slot(QBluetoothDeviceDiscoveryAgent.Error)
    def scanError(self, error):
        if error == QBluetoothDeviceDiscoveryAgent.PoweredOffError:
            self.error = "The Bluetooth adaptor is powered off."
        elif error == QBluetoothDeviceDiscoveryAgent.InputOutputError:
            self.error = "Writing or reading from the device resulted in an error."
        else:
            self.error = "An unknown error has occurred."

    @Slot()
    def scanFinished(self):
        if simulator:
            # Only for testing
            for i in range(5):
                self.m_devices.append(DeviceInfo(QBluetoothDeviceInfo()))

        if self.m_devices:
            self.info = "Scanning done."
        else:
            self.error = "No Low Energy devices found."

        self.scanningChanged.emit()
        self.devicesChanged.emit()

    @Slot(str)
    def connectToService(self, address):
        self.m_deviceDiscoveryAgent.stop()

        currentDevice = None
        for entry in self.m_devices:
            device = entry
            if device and device.deviceAddress == address:
                currentDevice = device
                break

        if currentDevice:
            self.m_deviceHandler.setDevice(currentDevice)

        self.clearMessages()

    @Property(bool, notify=scanningChanged)
    def scanning(self):
        if simulator:
            return self.m_demoTimer.isActive()
        return self.m_deviceDiscoveryAgent.isActive()

    @Property("QVariant", notify=devicesChanged)
    def devices(self):
        return self.m_devices