#
# Copyright 2016 the original author or authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import os
import subprocess
import socket
import time
import re


def run_command_to_completion_with_raw_stdout(cmd):
    try:
        env = os.environ.copy()
        proc = subprocess.Popen(
            cmd,
            env=env,
            shell=True,
            stdout=subprocess.PIPE
        )
        out, err = proc.communicate()
        return out, err, proc.returncode
    except OSError as e:
        print 'Exception {} when running command:{}'.format(repr(e), cmd)
    return None


def run_command_to_completion_with_stdout_in_list(cmd):
    stdout_response = []
    try:
        command = cmd
        env = os.environ.copy()
        proc = subprocess.Popen(
            command,
            env=env,
            shell=True,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            bufsize=1
        )
        with proc.stdout:
            for line in iter(proc.stdout.readline, b''):
                stdout_response.append(line)

        if proc.wait() != 0:
            err_msg = 'Command {} did not complete successfully '.format(cmd)
            return [], err_msg, proc.returncode

        return stdout_response, None, proc.returncode
    except OSError as e:
        print 'Exception {} when running command:{}'.format(repr(e), cmd)
    return None


def run_long_running_command_with_timeout(cmd, timeout,
                                          return_word_number_x_of_each_line=-1):
    captured_stdout = []
    try:
        t0 = time.time()
        env = os.environ.copy()
        proc = subprocess.Popen(
            cmd,
            env=env,
            shell=True,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            bufsize=1
        )
        for line in iter(proc.stdout.readline, b''):
            if return_word_number_x_of_each_line != -1:
                ansi_escape = re.compile(r'\x1b[^m]*m')
                line = ansi_escape.sub('', line)
                captured_stdout.append(
                    line.split()[return_word_number_x_of_each_line])
            else:
                captured_stdout.append(line)
            if time.time() - t0 > timeout:
                try:
                    proc.terminate()
                    proc.wait()
                    # In principle this 'reset' should not be required.
                    # However, without it, the terminal is left in a funny
                    # state and required
                    subprocess.Popen(['reset']).wait()
                except Exception as e:
                    print "Received exception {} when killing process " \
                          "started with {}".format(repr(e), cmd)
                break
        return captured_stdout
    except Exception as e:
        print 'Exception {} when running command:{}'.format(repr(e), cmd)
    return None

def is_open(ip_port):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    try:
        items = ip_port.split(':')
        s.connect((items[0], int(items[1])))
        s.shutdown(2)
        return True
    except:
        return False

def is_valid_ip(ip):
    try:
        socket.inet_aton(ip)
        return True
    except socket.error:
        return False