#!/usr/bin/env python
#
# jose.lausuch@ericsson.com
# valentin.boucher@orange.com
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
#

""" global variables """

from datetime import datetime as dt
import json
import os
import os.path
import re
import shutil
import socket
import subprocess
import sys
import urllib2

import functest.ci.tier_builder as tb
from git import Repo
import requests
import yaml


REPOS_DIR = os.getenv('repos_dir')
FUNCTEST_REPO = ("%s/functest/" % REPOS_DIR)


# ----------------------------------------------------------
#
#               INTERNET UTILS
#
# -----------------------------------------------------------
def check_internet_connectivity(url='http://www.opnfv.org/'):
    """
    Check if there is access to the internet
    """
    try:
        urllib2.urlopen(url, timeout=5)
        return True
    except urllib2.URLError:
        return False


def download_url(url, dest_path):
    """
    Download a file to a destination path given a URL
    """
    name = url.rsplit('/')[-1]
    dest = dest_path + "/" + name
    try:
        response = urllib2.urlopen(url)
    except (urllib2.HTTPError, urllib2.URLError):
        return False

    with open(dest, 'wb') as f:
        shutil.copyfileobj(response, f)
    return True


# ----------------------------------------------------------
#
#               CI UTILS
#
# -----------------------------------------------------------
def get_git_branch(repo_path):
    """
    Get git branch name
    """
    repo = Repo(repo_path)
    branch = repo.active_branch
    return branch.name


def get_installer_type(logger=None):
    """
    Get installer type (fuel, apex, joid, compass)
    """
    try:
        installer = os.environ['INSTALLER_TYPE']
    except KeyError:
        if logger:
            logger.error("Impossible to retrieve the installer type")
        installer = "Unknown_installer"

    return installer


def get_scenario(logger=None):
    """
    Get scenario
    """
    try:
        scenario = os.environ['DEPLOY_SCENARIO']
    except KeyError:
        if logger:
            logger.error("Impossible to retrieve the scenario")
        scenario = "Unknown_scenario"

    return scenario


def get_version(logger=None):
    """
    Get version
    """
    # Use the build tag to retrieve the version
    # By default version is unknown
    # if launched through CI the build tag has the following format
    # jenkins-<project>-<installer>-<pod>-<job>-<branch>-<id>
    # e.g. jenkins-functest-fuel-opnfv-jump-2-daily-master-190
    # use regex to match branch info
    rule = "daily-(.+?)-[0-9]*"
    build_tag = get_build_tag(logger)
    m = re.search(rule, build_tag)
    if m:
        return m.group(1)
    else:
        return "unknown"


def get_pod_name(logger=None):
    """
    Get PoD Name from env variable NODE_NAME
    """
    try:
        return os.environ['NODE_NAME']
    except KeyError:
        if logger:
            logger.error(
                "Unable to retrieve the POD name from environment. " +
                "Using pod name 'unknown-pod'")
        return "unknown-pod"


def get_build_tag(logger=None):
    """
    Get build tag of jenkins jobs
    """
    try:
        build_tag = os.environ['BUILD_TAG']
    except KeyError:
        if logger:
            logger.error("Impossible to retrieve the build tag")
        build_tag = "unknown_build_tag"

    return build_tag


def get_db_url(logger=None):
    """
    Returns DB URL
    """
    with open(os.environ["CONFIG_FUNCTEST_YAML"]) as f:
        functest_yaml = yaml.safe_load(f)
    f.close()
    db_url = functest_yaml.get("results").get("test_db_url")
    return db_url


def logger_test_results(logger, project, case_name, status, details):
    pod_name = get_pod_name(logger)
    scenario = get_scenario(logger)
    version = get_version(logger)
    build_tag = get_build_tag(logger)

    logger.info("Pushing %(p)s/%(n)s results: TEST_DB_URL=%(db)s "
                "pod_name=%(pod)s version=%(v)s scenario=%(s)s "
                "criteria=%(c)s details=%(d)s" % {
                    'p': project,
                    'n': case_name,
                    'db': get_db_url(),
                    'pod': pod_name,
                    'v': version,
                    's': scenario,
                    'c': status,
                    'b': build_tag,
                    'd': details,
                })


def push_results_to_db(project, case_name, logger,
                       start_date, stop_date, criteria, details):
    """
    POST results to the Result target DB
    """
    # Retrieve params from CI and conf
    url = get_db_url(logger) + "/results"
    installer = get_installer_type(logger)
    scenario = get_scenario(logger)
    version = get_version(logger)
    pod_name = get_pod_name(logger)
    build_tag = get_build_tag(logger)
    test_start = dt.fromtimestamp(start_date).strftime('%Y-%m-%d %H:%M:%S')
    test_stop = dt.fromtimestamp(stop_date).strftime('%Y-%m-%d %H:%M:%S')

    params = {"project_name": project, "case_name": case_name,
              "pod_name": pod_name, "installer": installer,
              "version": version, "scenario": scenario, "criteria": criteria,
              "build_tag": build_tag, "start_date": test_start,
              "stop_date": test_stop, "details": details}

    headers = {'Content-Type': 'application/json'}
    try:
        r = requests.post(url, data=json.dumps(params), headers=headers)
        if logger:
            logger.debug(r)
        return True
    except Exception, e:
        print ("Error [push_results_to_db('%s', '%s', '%s', " +
               "'%s', '%s', '%s', '%s', '%s', '%s')]:" %
               (url, project, case_name, pod_name, version,
                scenario, criteria, build_tag, details)), e
        return False


def get_resolvconf_ns():
    """
    Get nameservers from current resolv.conf
    """
    nameservers = []
    rconf = open("/etc/resolv.conf", "r")
    line = rconf.readline()
    while line:
        ip = re.search(r"\b(?:[0-9]{1,3}\.){3}[0-9]{1,3}\b", line)
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        if ip:
            result = sock.connect_ex((ip.group(), 53))
            if result == 0:
                nameservers.append(ip.group())
        line = rconf.readline()
    return nameservers


def get_ci_envvars():
    """
    Get the CI env variables
    """
    ci_env_var = {
        "installer": os.environ.get('INSTALLER_TYPE'),
        "scenario": os.environ.get('DEPLOY_SCENARIO')}
    return ci_env_var


def execute_command(cmd, logger=None,
                    exit_on_error=True,
                    info=False,
                    error_msg="",
                    verbose=True):
    if not error_msg:
        error_msg = ("The command '%s' failed." % cmd)
    msg_exec = ("Executing command: '%s'" % cmd)
    if verbose:
        if logger:
            if info:
                logger.info(msg_exec)
            else:
                logger.debug(msg_exec)
        else:
            print(msg_exec)
    p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
    for line in iter(p.stdout.readline, b''):
        line = line.replace('\n', '')
        if logger:
            if info:
                logger.info(line)
            else:
                logger.debug(line)
        else:
            print line
    p.stdout.close()
    returncode = p.wait()
    if returncode != 0:
        if verbose:
            if logger:
                logger.error(error_msg)
            else:
                print(error_msg)
        if exit_on_error:
            sys.exit(1)

    return returncode


def get_deployment_dir(logger=None):
    """
    Returns current Rally deployment directory
    """
    with open(os.environ["CONFIG_FUNCTEST_YAML"]) as f:
        functest_yaml = yaml.safe_load(f)
    f.close()
    deployment_name = functest_yaml.get("rally").get("deployment_name")
    rally_dir = functest_yaml.get("general").get("directories").get(
        "dir_rally_inst")
    cmd = ("rally deployment list | awk '/" + deployment_name +
           "/ {print $2}'")
    p = subprocess.Popen(cmd, shell=True,
                         stdout=subprocess.PIPE,
                         stderr=subprocess.STDOUT)
    deployment_uuid = p.stdout.readline().rstrip()
    if deployment_uuid == "":
        if logger:
            logger.error("Rally deployment not found.")
        exit(-1)
    deployment_dir = (rally_dir + "/tempest/for-deployment-" +
                      deployment_uuid)
    return deployment_dir


def get_criteria_by_test(testname):
    criteria = ""
    file = FUNCTEST_REPO + "/ci/testcases.yaml"
    tiers = tb.TierBuilder("", "", file)
    for tier in tiers.get_tiers():
        for test in tier.get_tests():
            if test.get_name() == testname:
                criteria = test.get_criteria()

    return criteria


# ----------------------------------------------------------
#
#               YAML UTILS
#
# -----------------------------------------------------------
def get_parameter_from_yaml(parameter, file=None):
    """
    Returns the value of a given parameter in config_functest.yaml
    parameter must be given in string format with dots
    Example: general.openstack.image_name
    """
    if file is None:
        file = os.environ["CONFIG_FUNCTEST_YAML"]
    with open(file) as f:
        functest_yaml = yaml.safe_load(f)
    f.close()
    value = functest_yaml
    for element in parameter.split("."):
        value = value.get(element)
        if value is None:
            raise ValueError("The parameter %s is not defined in"
                             " config_functest.yaml" % parameter)
    return value


def check_success_rate(case_name, success_rate):
    success_rate = float(success_rate)
    criteria = get_criteria_by_test(case_name)

    def get_value(op):
        return float(criteria.split(op)[1].rstrip('%'))

    status = 'FAIL'
    ops = ['==', '>=']
    for op in ops:
        if op in criteria:
            c_value = get_value(op)
            if eval("%s %s %s" % (success_rate, op, c_value)):
                status = 'PASS'
            break

    return status