"""
Support for Bluetooth (using BlueZ in Linux).

The following packages are required packages for this module:

    bluez >= 5.7
    bluez-libs >= 5.7
    bluez-utils >= 5.7
    pybluez >= 0.18
"""
import shlex

import salt.utils.validate.net
from salt.exceptions import CommandExecutionError

HAS_PYBLUEZ = False
try:
    import bluetooth  # pylint: disable=import-error

    HAS_PYBLUEZ = True
except ImportError:
    pass

__func_alias__ = {"address_": "address"}

# Define the module's virtual name
__virtualname__ = "bluetooth"


def __virtual__():
    """
    Only load the module if bluetooth is installed
    """
    if HAS_PYBLUEZ:
        return __virtualname__
    return (
        False,
        "The bluetooth execution module cannot be loaded: bluetooth not installed.",
    )


def version():
    """
    Return Bluez version from bluetoothd -v

    CLI Example:

    .. code-block:: bash

        salt '*' bluetoothd.version
    """
    cmd = "bluetoothctl -v"
    out = __salt__["cmd.run"](cmd).splitlines()
    bluez_version = out[0]
    pybluez_version = "<= 0.18 (Unknown, but installed)"
    try:
        pybluez_version = bluetooth.__version__
    except Exception as exc:  # pylint: disable=broad-except
        pass
    return {"Bluez": bluez_version, "PyBluez": pybluez_version}


def address_():
    """
    Get the many addresses of the Bluetooth adapter

    CLI Example:

    .. code-block:: bash

        salt '*' bluetooth.address
    """
    ret = {}
    cmd = "hciconfig"
    out = __salt__["cmd.run"](cmd).splitlines()
    dev = ""
    for line in out:
        if line.startswith("hci"):
            comps = line.split(":")
            dev = comps[0]
            ret[dev] = {
                "device": dev,
                "path": "/sys/class/bluetooth/{}".format(dev),
            }
        if "BD Address" in line:
            comps = line.split()
            ret[dev]["address"] = comps[2]
        if "DOWN" in line:
            ret[dev]["power"] = "off"
        if "UP RUNNING" in line:
            ret[dev]["power"] = "on"
    return ret


def power(dev, mode):
    """
    Power a bluetooth device on or off

    CLI Examples:

    .. code-block:: bash

        salt '*' bluetooth.power hci0 on
        salt '*' bluetooth.power hci0 off
    """
    if dev not in address_():
        raise CommandExecutionError("Invalid dev passed to bluetooth.power")

    if mode == "on" or mode is True:
        state = "up"
        mode = "on"
    else:
        state = "down"
        mode = "off"
    cmd = "hciconfig {} {}".format(dev, state)
    __salt__["cmd.run"](cmd).splitlines()
    info = address_()
    if info[dev]["power"] == mode:
        return True
    return False


def discoverable(dev):
    """
    Enable this bluetooth device to be discoverable.

    CLI Example:

    .. code-block:: bash

        salt '*' bluetooth.discoverable hci0
    """
    if dev not in address_():
        raise CommandExecutionError("Invalid dev passed to bluetooth.discoverable")

    cmd = "hciconfig {} iscan".format(dev)
    __salt__["cmd.run"](cmd).splitlines()
    cmd = "hciconfig {}".format(dev)
    out = __salt__["cmd.run"](cmd)
    if "UP RUNNING ISCAN" in out:
        return True
    return False


def noscan(dev):
    """
    Turn off scanning modes on this device.

    CLI Example:

    .. code-block:: bash

        salt '*' bluetooth.noscan hci0
    """
    if dev not in address_():
        raise CommandExecutionError("Invalid dev passed to bluetooth.noscan")

    cmd = "hciconfig {} noscan".format(dev)
    __salt__["cmd.run"](cmd).splitlines()
    cmd = "hciconfig {}".format(dev)
    out = __salt__["cmd.run"](cmd)
    if "SCAN" in out:
        return False
    return True


def scan():
    """
    Scan for bluetooth devices in the area

    CLI Example:

    .. code-block:: bash

        salt '*' bluetooth.scan
    """
    ret = []
    devices = bluetooth.discover_devices(lookup_names=True)
    for device in devices:
        ret.append({device[0]: device[1]})
    return ret


def block(bdaddr):
    """
    Block a specific bluetooth device by BD Address

    CLI Example:

    .. code-block:: bash

        salt '*' bluetooth.block DE:AD:BE:EF:CA:FE
    """
    if not salt.utils.validate.net.mac(bdaddr):
        raise CommandExecutionError("Invalid BD address passed to bluetooth.block")

    cmd = "hciconfig {} block".format(bdaddr)
    __salt__["cmd.run"](cmd).splitlines()


def unblock(bdaddr):
    """
    Unblock a specific bluetooth device by BD Address

    CLI Example:

    .. code-block:: bash

        salt '*' bluetooth.unblock DE:AD:BE:EF:CA:FE
    """
    if not salt.utils.validate.net.mac(bdaddr):
        raise CommandExecutionError("Invalid BD address passed to bluetooth.unblock")

    cmd = "hciconfig {} unblock".format(bdaddr)
    __salt__["cmd.run"](cmd).splitlines()


def pair(address, key):
    """
    Pair the bluetooth adapter with a device

    CLI Example:

    .. code-block:: bash

        salt '*' bluetooth.pair DE:AD:BE:EF:CA:FE 1234

    Where DE:AD:BE:EF:CA:FE is the address of the device to pair with, and 1234
    is the passphrase.

    TODO: This function is currently broken, as the bluez-simple-agent program
    no longer ships with BlueZ >= 5.0. It needs to be refactored.
    """
    if not salt.utils.validate.net.mac(address):
        raise CommandExecutionError("Invalid BD address passed to bluetooth.pair")

    try:
        int(key)
    except Exception:  # pylint: disable=broad-except
        raise CommandExecutionError(
            "bluetooth.pair requires a numerical key to be used"
        )

    addy = address_()
    cmd = "echo {} | bluez-simple-agent {} {}".format(
        shlex.quote(addy["device"]), shlex.quote(address), shlex.quote(key)
    )
    out = __salt__["cmd.run"](cmd, python_shell=True).splitlines()
    return out


def unpair(address):
    """
    Unpair the bluetooth adapter from a device

    CLI Example:

    .. code-block:: bash

        salt '*' bluetooth.unpair DE:AD:BE:EF:CA:FE

    Where DE:AD:BE:EF:CA:FE is the address of the device to unpair.

    TODO: This function is currently broken, as the bluez-simple-agent program
    no longer ships with BlueZ >= 5.0. It needs to be refactored.
    """
    if not salt.utils.validate.net.mac(address):
        raise CommandExecutionError("Invalid BD address passed to bluetooth.unpair")

    cmd = "bluez-test-device remove {}".format(address)
    out = __salt__["cmd.run"](cmd).splitlines()
    return out


def start():
    """
    Start the bluetooth service.

    CLI Example:

    .. code-block:: bash

        salt '*' bluetooth.start
    """
    out = __salt__["service.start"]("bluetooth")
    return out


def stop():
    """
    Stop the bluetooth service.

    CLI Example:

    .. code-block:: bash

        salt '*' bluetooth.stop
    """
    out = __salt__["service.stop"]("bluetooth")
    return out
