# -*- coding: utf-8 -*-
#!/usr/bin/env python2.7
# Copyright (c) 2019 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import json
import logging
import requests


"""This file consists of all the helper methods needed to interact with the
   Datastore @ https://chaos-188802.appspot.com/ used for ChromeOS Interop
   testing.
"""

CHAOS_DATASTORE_URL = "https://chaos-188802.appspot.com"

# The Datastore defines the following paths for operating methods.
ADD_DEVICE = "devices/new"
REMOVE_DEVICE = "devices/delete"
LOCK_DEVICE = "devices/lock"
UNLOCK_DEVICE = "devices/unlock"
SHOW_DEVICE = "devices/"
GET_DEVICES = "devices/"
GET_UNLOCKED_DEVICES = "unlocked_devices/"
GET_DEVICES_BY_AP_LABEL = "devices/location"

# HTTP content type. JSON encoded with UTF-8 character encoding.
HTTP_HEADER = {'content-type': 'application/json'}


def add_device(host_name, ap_label):
    """
    Add a device(AP or Packet Capturer) in datastore.

    @param host_name: string, hostname of the device.
    @param ap_label: string, CrOS_AP (for AP), CrOS_PCAP (for PCAP)
    @param lab_label: string, CrOS_Chaos (lab name), used for all APs & PCAPs

    @return: True if device was added successfully; False otherwise.
    @rtype: bool

    """
    request = CHAOS_DATASTORE_URL + '/' + ADD_DEVICE
    logging.debug("Request = %s", request)
    response = requests.post(request,
                             headers=HTTP_HEADER,
                             data=json.dumps({"hostname":host_name,
                                              "ap_label":ap_label,
                                              "lab_label":"CrOS_Chaos",
                                              "router_name":host_name}))
    if response.json()['result']:
        logging.info("Added device %s to datastore", host_name)
        return True

    return False


def remove_device(host_name):
    """
    Delete a device(AP or Packet Capturer) in datastore.

    @param host_name: string, hostname of the device to delete.

    @return: True if device was deleted successfully; False otherwise.
    @rtype: bool

    """
    request = CHAOS_DATASTORE_URL + '/' + REMOVE_DEVICE
    logging.debug("Request = %s", request)
    response = requests.put(request,
                            headers=HTTP_HEADER,
                            data=json.dumps({"hostname":host_name}))
    result_str = "%s deleted." % host_name
    if result_str in response.text:
        logging.info("Removed device %s from datastore", host_name)
        return True

    return False


def lock_device(host_name):
    """
    Lock a device(AP or Packet Capturer) in datastore.

    @param host_name: string, hostname of the device in datastore.

    @return: True if operation was successful; False otherwise.
    @rtype: bool

    """
    request = CHAOS_DATASTORE_URL + '/' + LOCK_DEVICE
    logging.debug("Request = %s", request)
    response = requests.put(request,
                            headers=HTTP_HEADER,
                            data=json.dumps({"hostname":host_name,
                                             "locked_by":"TestRun"}))
    if response.json()['result']:
        logging.info("Locked device %s in datastore", host_name)
        return True

    return False


def unlock_device(host_name):
    """
    Un-lock a device(AP or Packet Capturer) in datastore.

    @param host_name: string, hostname of the device in datastore.

    @return: True if operation was successful; False otherwise.
    @rtype: bool

    """
    request = CHAOS_DATASTORE_URL + '/' + UNLOCK_DEVICE
    logging.debug("Request = %s", request)
    response = requests.put(request,
                            headers=HTTP_HEADER,
                            data=json.dumps({"hostname":host_name}))
    if response.json()['result']:
        logging.info("Finished un-locking AP %s in datastore", host_name)
        return True

    logging.error("Unable to unlock AP %s", host_name)
    return False


def show_device(host_name):
    """
    Show device properties for a given device(AP or Packet Capturer).

    @param host_name: string, hostname of the device in datastore to fetch info.

    @return: dict of device name:value properties if successful;
             False otherwise.
    @rtype: dict when True, else bool:False

    """
    request = CHAOS_DATASTORE_URL + '/' + SHOW_DEVICE + host_name
    logging.debug("Request = %s", request)
    response = requests.get(request)
    if 'error' in response.text:
        return False

    return response.json()


def get_unlocked_devices():
    """
    Get a list of all un-locked devices in the datastore.

    @return: dict of all un-locked devices' name:value properties if successful;
             False otherwise.
    @rtype: dict when True, else bool:False

    """
    request = CHAOS_DATASTORE_URL + '/' + GET_UNLOCKED_DEVICES
    logging.debug("Request = %s", request)
    response = requests.get(request)
    if 'error' in response.text:
        return False

    return response.json()


def get_devices():
    """
    Get a list of all devices in the datastore.

    @return: dict of all devices' name:value properties if successful;
             False otherwise.
    @rtype: dict when True, else bool:False

    """
    request = CHAOS_DATASTORE_URL + '/' + GET_DEVICES
    logging.debug("Request = %s", request)
    response = requests.get(request)
    if 'error' in response.text:
        return False

    return response.json()


def get_devices_by_type(ap_label, lab_label):
    """
    Get list of all un-locked devices by ap_label & lab_label

    @param ap_label: string, CrOS_AP/CrOS_PCAP, to filter device types.
    @param lab_label: string, "CrOS_Chaos", All devices in ChromeOS Chaos lab

    @return: dict of all devices' name:value properties if successful;
             False otherwise.
    @rtype: dict when True, else bool:False

    """
    request = CHAOS_DATASTORE_URL + '/' +  GET_DEVICES_BY_AP_LABEL
    logging.debug("Request = %s", request)
    response = requests.put(request,
                            headers=HTTP_HEADER,
                            data=json.dumps({"ap_label":ap_label,
                                             "lab_label":lab_label}))
    if 'error' in response.text:
        return False

    return response.json()


def find_device(host_name):
    """
    Find if given device(AP or Packet Capturer) in DataStore.

    @param host_name: string, hostname of the device in datastore to fetch info.
    @return: True if found; False otherwise.
    @rtype: bool

    """
    request = CHAOS_DATASTORE_URL + '/' + SHOW_DEVICE + host_name
    logging.debug("Request = %s", request)
    response = requests.get(request)
    if 'null' in response.text:
        return False

    return True