# (c) 2012-2014, Michael DeHaan <michael.dehaan@gmail.com>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.

# Make coding more python3-ish
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type

import operator
import optparse
import os
import sys
import time
import yaml
import re
import getpass
import subprocess

from ansible import __version__
from ansible import constants as C
from ansible.errors import AnsibleError, AnsibleOptionsError
from ansible.utils.unicode import to_bytes

try:
    from __main__ import display
except ImportError:
    from ansible.utils.display import Display
    display = Display()


class SortedOptParser(optparse.OptionParser):
    '''Optparser which sorts the options by opt before outputting --help'''

    # TODO: epilog parsing: OptionParser.format_epilog = lambda self, formatter: self.epilog

    def format_help(self, formatter=None, epilog=None):
        self.option_list.sort(key=operator.methodcaller('get_opt_string'))
        return optparse.OptionParser.format_help(self, formatter=None)


class CLI(object):
    ''' code behind bin/ansible* programs '''

    VALID_ACTIONS = ['No Actions']

    _ITALIC = re.compile(r"I\(([^)]+)\)")
    _BOLD   = re.compile(r"B\(([^)]+)\)")
    _MODULE = re.compile(r"M\(([^)]+)\)")
    _URL    = re.compile(r"U\(([^)]+)\)")
    _CONST  = re.compile(r"C\(([^)]+)\)")

    PAGER   = 'less'
    LESS_OPTS = 'FRSX'  # -F (quit-if-one-screen) -R (allow raw ansi control chars)
                        # -S (chop long lines) -X (disable termcap init and de-init)

    def __init__(self, args, callback=None):
        """
        Base init method for all command line programs
        """

        self.args = args
        self.options = None
        self.parser = None
        self.action = None
        self.callback = callback

    def set_action(self):
        """
        Get the action the user wants to execute from the sys argv list.
        """
        for i in range(0,len(self.args)):
            arg = self.args[i]
            if arg in self.VALID_ACTIONS:
                self.action = arg
                del self.args[i]
                break

        if not self.action:
            raise AnsibleOptionsError("Missing required action")

    def execute(self):
        """
        Actually runs a child defined method using the execute_<action> pattern
        """
        fn = getattr(self, "execute_%s" % self.action)
        fn()

    def parse(self):
        raise Exception("Need to implement!")

    def run(self):

        if self.options.verbosity > 0:
            if C.CONFIG_FILE:
                display.display("Using %s as config file" % C.CONFIG_FILE)
            else:
                display.display("No config file found; using defaults")

    @staticmethod
    def ask_vault_passwords(ask_new_vault_pass=False, rekey=False):
        ''' prompt for vault password and/or password change '''

        vault_pass = None
        new_vault_pass = None
        try:
            if rekey or not ask_new_vault_pass:
                vault_pass = getpass.getpass(prompt="Vault password: ")

            if ask_new_vault_pass:
                new_vault_pass = getpass.getpass(prompt="New Vault password: ")
                new_vault_pass2 = getpass.getpass(prompt="Confirm New Vault password: ")
                if new_vault_pass != new_vault_pass2:
                    raise AnsibleError("Passwords do not match")
        except EOFError:
            pass

        # enforce no newline chars at the end of passwords
        if vault_pass:
            vault_pass = to_bytes(vault_pass, errors='strict', nonstring='simplerepr').strip()
        if new_vault_pass:
            new_vault_pass = to_bytes(new_vault_pass, errors='strict', nonstring='simplerepr').strip()

        if ask_new_vault_pass and not rekey:
            vault_pass = new_vault_pass

        return vault_pass, new_vault_pass

    def ask_passwords(self):
        ''' prompt for connection and become passwords if needed '''

        op = self.options
        sshpass = None
        becomepass = None
        become_prompt = ''

        try:
            if op.ask_pass:
                sshpass = getpass.getpass(prompt="SSH password: ")
                become_prompt = "%s password[defaults to SSH password]: " % op.become_method.upper()
                if sshpass:
                    sshpass = to_bytes(sshpass, errors='strict', nonstring='simplerepr')
            else:
                become_prompt = "%s password: " % op.become_method.upper()

            if op.become_ask_pass:
                becomepass = getpass.getpass(prompt=become_prompt)
                if op.ask_pass and becomepass == '':
                    becomepass = sshpass
                if becomepass:
                    becomepass = to_bytes(becomepass)
        except EOFError:
            pass

        return (sshpass, becomepass)

    def normalize_become_options(self):
        ''' this keeps backwards compatibility with sudo/su self.options '''
        self.options.become_ask_pass = self.options.become_ask_pass or self.options.ask_sudo_pass or self.options.ask_su_pass or C.DEFAULT_BECOME_ASK_PASS
        self.options.become_user     = self.options.become_user or self.options.sudo_user or self.options.su_user or C.DEFAULT_BECOME_USER

        if self.options.become:
            pass
        elif self.options.sudo:
            self.options.become = True
            self.options.become_method = 'sudo'
        elif self.options.su:
            self.options.become = True
            self.options.become_method = 'su'

    def validate_conflicts(self, vault_opts=False, runas_opts=False, fork_opts=False):
        ''' check for conflicting options '''

        op = self.options

        if vault_opts:
            # Check for vault related conflicts
            if (op.ask_vault_pass and op.vault_password_file):
                self.parser.error("--ask-vault-pass and --vault-password-file are mutually exclusive")

        if runas_opts:
            # Check for privilege escalation conflicts
            if (op.su or op.su_user) and (op.sudo or op.sudo_user) or \
                (op.su or op.su_user) and (op.become or op.become_user) or \
                (op.sudo or op.sudo_user) and (op.become or op.become_user):

                self.parser.error("Sudo arguments ('--sudo', '--sudo-user', and '--ask-sudo-pass') "
                                  "and su arguments ('-su', '--su-user', and '--ask-su-pass') "
                                  "and become arguments ('--become', '--become-user', and '--ask-become-pass')"
                                  " are exclusive of each other")

        if fork_opts:
            if op.forks < 1:
                self.parser.error("The number of processes (--forks) must be >= 1")

    @staticmethod
    def expand_tilde(option, opt, value, parser):
        setattr(parser.values, option.dest, os.path.expanduser(value))

    @staticmethod
    def base_parser(usage="", output_opts=False, runas_opts=False, meta_opts=False, runtask_opts=False, vault_opts=False, module_opts=False,
            async_opts=False, connect_opts=False, subset_opts=False, check_opts=False, inventory_opts=False, epilog=None, fork_opts=False, runas_prompt_opts=False):
        ''' create an options parser for most ansible scripts '''

        # TODO: implement epilog parsing
        #       OptionParser.format_epilog = lambda self, formatter: self.epilog

        # base opts
        parser = SortedOptParser(usage, version=CLI.version("%prog"))
        parser.add_option('-v','--verbose', dest='verbosity', default=0, action="count",
            help="verbose mode (-vvv for more, -vvvv to enable connection debugging)")

        if inventory_opts:
            parser.add_option('-i', '--inventory-file', dest='inventory',
                help="specify inventory host path (default=%s) or comma separated host list" % C.DEFAULT_HOST_LIST,
                default=C.DEFAULT_HOST_LIST, action="callback", callback=CLI.expand_tilde, type=str)
            parser.add_option('--list-hosts', dest='listhosts', action='store_true',
                help='outputs a list of matching hosts; does not execute anything else')
            parser.add_option('-l', '--limit', default=C.DEFAULT_SUBSET, dest='subset',
                help='further limit selected hosts to an additional pattern')

        if module_opts:
            parser.add_option('-M', '--module-path', dest='module_path', default=None,
                help="specify path(s) to module library (default=%s)" % C.DEFAULT_MODULE_PATH,
                action="callback", callback=CLI.expand_tilde, type=str)
        if runtask_opts:
            parser.add_option('-e', '--extra-vars', dest="extra_vars", action="append",
                help="set additional variables as key=value or YAML/JSON", default=[])

        if fork_opts:
            parser.add_option('-f','--forks', dest='forks', default=C.DEFAULT_FORKS, type='int',
                help="specify number of parallel processes to use (default=%s)" % C.DEFAULT_FORKS)

        if vault_opts:
            parser.add_option('--ask-vault-pass', default=C.DEFAULT_ASK_VAULT_PASS, dest='ask_vault_pass', action='store_true',
                help='ask for vault password')
            parser.add_option('--vault-password-file', default=C.DEFAULT_VAULT_PASSWORD_FILE, dest='vault_password_file',
                help="vault password file", action="callback", callback=CLI.expand_tilde, type=str)
            parser.add_option('--new-vault-password-file', dest='new_vault_password_file',
                help="new vault password file for rekey", action="callback", callback=CLI.expand_tilde, type=str)
            parser.add_option('--output', default=None, dest='output_file',
                help='output file name for encrypt or decrypt; use - for stdout',
                action="callback", callback=CLI.expand_tilde, type=str)

        if subset_opts:
            parser.add_option('-t', '--tags', dest='tags', default='all',
                help="only run plays and tasks tagged with these values")
            parser.add_option('--skip-tags', dest='skip_tags',
                help="only run plays and tasks whose tags do not match these values")

        if output_opts:
            parser.add_option('-o', '--one-line', dest='one_line', action='store_true',
                help='condense output')
            parser.add_option('-t', '--tree', dest='tree', default=None,
                help='log output to this directory')

        if runas_opts:
            # priv user defaults to root later on to enable detecting when this option was given here
            parser.add_option("-s", "--sudo", default=C.DEFAULT_SUDO, action="store_true", dest='sudo',
                help="run operations with sudo (nopasswd) (deprecated, use become)")
            parser.add_option('-U', '--sudo-user', dest='sudo_user', default=None,
                              help='desired sudo user (default=root) (deprecated, use become)')
            parser.add_option('-S', '--su', default=C.DEFAULT_SU, action='store_true',
                help='run operations with su (deprecated, use become)')
            parser.add_option('-R', '--su-user', default=None,
                help='run operations with su as this user (default=%s) (deprecated, use become)' % C.DEFAULT_SU_USER)

            # consolidated privilege escalation (become)
            parser.add_option("-b", "--become", default=C.DEFAULT_BECOME, action="store_true", dest='become',
                help="run operations with become (nopasswd implied)")
            parser.add_option('--become-method', dest='become_method', default=C.DEFAULT_BECOME_METHOD, type='string',
                help="privilege escalation method to use (default=%s), valid choices: [ %s ]" % (C.DEFAULT_BECOME_METHOD, ' | '.join(C.BECOME_METHODS)))
            parser.add_option('--become-user', default=None, dest='become_user', type='string',
                help='run operations as this user (default=%s)' % C.DEFAULT_BECOME_USER)

        if runas_opts or runas_prompt_opts:
            parser.add_option('-K', '--ask-sudo-pass', default=C.DEFAULT_ASK_SUDO_PASS, dest='ask_sudo_pass', action='store_true',
                help='ask for sudo password (deprecated, use become)')
            parser.add_option('--ask-su-pass', default=C.DEFAULT_ASK_SU_PASS, dest='ask_su_pass', action='store_true',
                help='ask for su password (deprecated, use become)')
            parser.add_option('--ask-become-pass', default=False, dest='become_ask_pass', action='store_true',
                help='ask for privilege escalation password')

        if connect_opts:
            parser.add_option('-k', '--ask-pass', default=C.DEFAULT_ASK_PASS, dest='ask_pass', action='store_true',
                help='ask for connection password')
            parser.add_option('--private-key','--key-file', default=C.DEFAULT_PRIVATE_KEY_FILE, dest='private_key_file',
                help='use this file to authenticate the connection')
            parser.add_option('-u', '--user', default=C.DEFAULT_REMOTE_USER, dest='remote_user',
                help='connect as this user (default=%s)' % C.DEFAULT_REMOTE_USER)
            parser.add_option('-c', '--connection', dest='connection', default=C.DEFAULT_TRANSPORT,
                help="connection type to use (default=%s)" % C.DEFAULT_TRANSPORT)
            parser.add_option('-T', '--timeout', default=C.DEFAULT_TIMEOUT, type='int', dest='timeout',
                help="override the connection timeout in seconds (default=%s)" % C.DEFAULT_TIMEOUT)
            parser.add_option('--ssh-common-args', default='', dest='ssh_common_args',
                help="specify common arguments to pass to sftp/scp/ssh (e.g. ProxyCommand)")
            parser.add_option('--sftp-extra-args', default='', dest='sftp_extra_args',
                help="specify extra arguments to pass to sftp only (e.g. -f, -l)")
            parser.add_option('--scp-extra-args', default='', dest='scp_extra_args',
                help="specify extra arguments to pass to scp only (e.g. -l)")
            parser.add_option('--ssh-extra-args', default='', dest='ssh_extra_args',
                help="specify extra arguments to pass to ssh only (e.g. -R)")

        if async_opts:
            parser.add_option('-P', '--poll', default=C.DEFAULT_POLL_INTERVAL, type='int', dest='poll_interval',
                help="set the poll interval if using -B (default=%s)" % C.DEFAULT_POLL_INTERVAL)
            parser.add_option('-B', '--background', dest='seconds', type='int', default=0,
                help='run asynchronously, failing after X seconds (default=N/A)')

        if check_opts:
            parser.add_option("-C", "--check", default=False, dest='check', action='store_true',
                help="don't make any changes; instead, try to predict some of the changes that may occur")
            parser.add_option('--syntax-check', dest='syntax', action='store_true',
                help="perform a syntax check on the playbook, but do not execute it")
            parser.add_option("-D", "--diff", default=False, dest='diff', action='store_true',
                help="when changing (small) files and templates, show the differences in those files; works great with --check")

        if meta_opts:
            parser.add_option('--force-handlers', default=C.DEFAULT_FORCE_HANDLERS, dest='force_handlers', action='store_true',
                help="run handlers even if a task fails")
            parser.add_option('--flush-cache', dest='flush_cache', action='store_true',
                help="clear the fact cache")

        return parser

    @staticmethod
    def version(prog):
        ''' return ansible version '''
        result = "{0} {1}".format(prog, __version__)
        gitinfo = CLI._gitinfo()
        if gitinfo:
            result = result + " {0}".format(gitinfo)
        result += "\n  config file = %s" % C.CONFIG_FILE
        if C.DEFAULT_MODULE_PATH is None:
            cpath = "Default w/o overrides"
        else:
            cpath = C.DEFAULT_MODULE_PATH
        result = result + "\n  configured module search path = %s" % cpath
        return result

    @staticmethod
    def version_info(gitinfo=False):
        ''' return full ansible version info '''
        if gitinfo:
            # expensive call, user with care
            ansible_version_string = CLI.version('')
        else:
            ansible_version_string = __version__
        ansible_version = ansible_version_string.split()[0]
        ansible_versions = ansible_version.split('.')
        for counter in range(len(ansible_versions)):
            if ansible_versions[counter] == "":
                ansible_versions[counter] = 0
            try:
                ansible_versions[counter] = int(ansible_versions[counter])
            except:
                pass
        if len(ansible_versions) < 3:
            for counter in range(len(ansible_versions), 3):
                ansible_versions.append(0)
        return {'string':      ansible_version_string.strip(),
                'full':        ansible_version,
                'major':       ansible_versions[0],
                'minor':       ansible_versions[1],
                'revision':    ansible_versions[2]}

    @staticmethod
    def _git_repo_info(repo_path):
        ''' returns a string containing git branch, commit id and commit date '''
        result = None
        if os.path.exists(repo_path):
            # Check if the .git is a file. If it is a file, it means that we are in a submodule structure.
            if os.path.isfile(repo_path):
                try:
                    gitdir = yaml.safe_load(open(repo_path)).get('gitdir')
                    # There is a possibility the .git file to have an absolute path.
                    if os.path.isabs(gitdir):
                        repo_path = gitdir
                    else:
                        repo_path = os.path.join(repo_path[:-4], gitdir)
                except (IOError, AttributeError):
                    return ''
            f = open(os.path.join(repo_path, "HEAD"))
            branch = f.readline().split('/')[-1].rstrip("\n")
            f.close()
            branch_path = os.path.join(repo_path, "refs", "heads", branch)
            if os.path.exists(branch_path):
                f = open(branch_path)
                commit = f.readline()[:10]
                f.close()
            else:
                # detached HEAD
                commit = branch[:10]
                branch = 'detached HEAD'
                branch_path = os.path.join(repo_path, "HEAD")

            date = time.localtime(os.stat(branch_path).st_mtime)
            if time.daylight == 0:
                offset = time.timezone
            else:
                offset = time.altzone
            result = "({0} {1}) last updated {2} (GMT {3:+04d})".format(branch, commit,
                time.strftime("%Y/%m/%d %H:%M:%S", date), int(offset / -36))
        else:
            result = ''
        return result

    @staticmethod
    def _gitinfo():
        basedir = os.path.join(os.path.dirname(__file__), '..', '..', '..')
        repo_path = os.path.join(basedir, '.git')
        result = CLI._git_repo_info(repo_path)
        submodules = os.path.join(basedir, '.gitmodules')
        if not os.path.exists(submodules):
            return result
        f = open(submodules)
        for line in f:
            tokens = line.strip().split(' ')
            if tokens[0] == 'path':
                submodule_path = tokens[2]
                submodule_info = CLI._git_repo_info(os.path.join(basedir, submodule_path, '.git'))
                if not submodule_info:
                    submodule_info = ' not found - use git submodule update --init ' + submodule_path
                result += "\n  {0}: {1}".format(submodule_path, submodule_info)
        f.close()
        return result

    def pager(self, text):
        ''' find reasonable way to display text '''
        # this is a much simpler form of what is in pydoc.py
        if not sys.stdout.isatty():
            display.display(text)
        elif 'PAGER' in os.environ:
            if sys.platform == 'win32':
                display.display(text)
            else:
                self.pager_pipe(text, os.environ['PAGER'])
        elif subprocess.call('(less --version) 2> /dev/null', shell = True) == 0:
            self.pager_pipe(text, 'less')
        else:
            display.display(text)

    @staticmethod
    def pager_pipe(text, cmd):
        ''' pipe text through a pager '''
        if 'LESS' not in os.environ:
            os.environ['LESS'] = CLI.LESS_OPTS
        try:
            cmd = subprocess.Popen(cmd, shell=True, stdin=subprocess.PIPE, stdout=sys.stdout)
            cmd.communicate(input=text.encode(sys.stdout.encoding))
        except IOError:
            pass
        except KeyboardInterrupt:
            pass

    @classmethod
    def tty_ify(cls, text):

        t = cls._ITALIC.sub("`" + r"\1" + "'", text)    # I(word) => `word'
        t = cls._BOLD.sub("*" + r"\1" + "*", t)         # B(word) => *word*
        t = cls._MODULE.sub("[" + r"\1" + "]", t)       # M(word) => [word]
        t = cls._URL.sub(r"\1", t)                      # U(word) => word
        t = cls._CONST.sub("`" + r"\1" + "'", t)        # C(word) => `word'

        return t

    @staticmethod
    def read_vault_password_file(vault_password_file, loader):
        """
        Read a vault password from a file or if executable, execute the script and
        retrieve password from STDOUT
        """

        this_path = os.path.realpath(os.path.expanduser(vault_password_file))
        if not os.path.exists(this_path):
            raise AnsibleError("The vault password file %s was not found" % this_path)

        if loader.is_executable(this_path):
            try:
                # STDERR not captured to make it easier for users to prompt for input in their scripts
                p = subprocess.Popen(this_path, stdout=subprocess.PIPE)
            except OSError as e:
                raise AnsibleError("Problem running vault password script %s (%s). If this is not a script, remove the executable bit from the file." % (' '.join(this_path), e))
            stdout, stderr = p.communicate()
            vault_pass = stdout.strip('\r\n')
        else:
            try:
                f = open(this_path, "rb")
                vault_pass=f.read().strip()
                f.close()
            except (OSError, IOError) as e:
                raise AnsibleError("Could not read vault password file %s: %s" % (this_path, e))

        return vault_pass

    def get_opt(self, k, defval=""):
        """
        Returns an option from an Optparse values instance.
        """
        try:
            data = getattr(self.options, k)
        except:
            return defval
        if k == "roles_path":
            if os.pathsep in data:
                data = data.split(os.pathsep)[0]
        return data
