#!/usr/bin/env python

# (c) 2014, James Tanner <tanner.jc@gmail.com>
#
# 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/>.
#
# ansible-vault is a script that encrypts/decrypts YAML files. See
# http://docs.ansible.com/playbooks_vault.html for more details.

__requires__ = ['ansible']
try:
    import pkg_resources
except Exception:
    # Use pkg_resources to find the correct versions of libraries and set
    # sys.path appropriately when there are multiversion installs.  But we
    # have code that better expresses the errors in the places where the code
    # is actually used (the deps are optional for many code paths) so we don't
    # want to fail here.
    pass

import os
import sys
import traceback

from ansible.errors import AnsibleError
from ansible.parsing.vault import VaultEditor
from ansible.utils.cli import base_parser, ask_vault_passwords

#-------------------------------------------------------------------------------------
# Utility functions for parsing actions/options
#-------------------------------------------------------------------------------------



class Cli(object):

    VALID_ACTIONS = ("create", "decrypt", "edit", "encrypt", "rekey", "view")


    def __init__(self, display=None):

        self.vault_pass = None

        if display is None:
            self.display = Display()
        else:
            self.display = display


    def parse(self):

        # create parser for CLI options
        parser = base_parser(
            usage = "%prog vaultfile.yml",
        )

        return parser.parse_args()

    def run(self, options, args):

        action = self.get_action(args)

        if not action:
            parser.print_help()
            raise AnsibleError("missing required action")

        # options specific to actions
        if action == "create":
            parser.set_usage("usage: %prog create [options] file_name")
        elif action == "decrypt":
            parser.set_usage("usage: %prog decrypt [options] file_name")
        elif action == "edit":
            parser.set_usage("usage: %prog edit [options] file_name")
        elif action == "view":
            parser.set_usage("usage: %prog view [options] file_name")
        elif action == "encrypt":
            parser.set_usage("usage: %prog encrypt [options] file_name")
        elif action == "rekey":
            parser.set_usage("usage: %prog rekey [options] file_name")

        if len(args) == 0 or len(args) > 1:
            parser.print_help()
            raise AnsibleError("Vault requires a single filename as a parameter")

        if options.vault_password_file:
            # read vault_pass from a file
            self.vault_pass = read_vault_file(options.vault_password_file)
        else:
            self.vault_pass, _= ask_vault_passwords(ask_vault_pass=True, ask_new_vault_pass=False, confirm_new=False)

        # execute the desired action
        fn = getattr(self, "execute_%s" % action)
        fn(args, options)

    def get_action(self, args):
        """
        Get the action the user wants to execute from the
        sys argv list.
        """
        for i in range(0,len(args)):
            arg = args[i]
            if arg in VALID_ACTIONS:
                del args[i]
                return arg
        return None

    def execute_create(args, options):

        cipher = 'AES256'
        if hasattr(options, 'cipher'):
            cipher = options.cipher

        this_editor = VaultEditor(cipher, self.vault_pass, args[0])
        this_editor.create_file()

    def execute_decrypt(args, options):

        cipher = 'AES256'
        if hasattr(options, 'cipher'):
            cipher = options.cipher

        for f in args:
            this_editor = VaultEditor(cipher, self.vault_pass, f)
            this_editor.decrypt_file()

        self.display.display("Decryption successful")

    def execute_edit(args, options):

        cipher = None

        for f in args:
            this_editor = VaultEditor(cipher, self.vault_pass, f)
            this_editor.edit_file()

    def execute_view(args, options):

        cipher = None

        for f in args:
            this_editor = VaultEditor(cipher, self.vault_pass, f)
            this_editor.view_file()

    def execute_encrypt(args, options):

        cipher = 'AES256'
        if hasattr(options, 'cipher'):
            cipher = options.cipher

        for f in args:
            this_editor = VaultEditor(cipher, self.vault_pass, f)
            this_editor.encrypt_file()

        self.display.display("Encryption successful")

    def execute_rekey(args, options ):
        __, new_password = ask_vault_passwords(ask_vault_pass=False, ask_new_vault_pass=True, confirm_new=True)

        cipher = None
        for f in args:
            this_editor = VaultEditor(cipher, self.vault_pass, f)
            this_editor.rekey_file(new_password)

        self.display.display("Rekey successful")

########################################################

if __name__ == "__main__":

    display = Display()
    #display.display(" ".join(sys.argv), log_only=True)

    try:
        cli = Cli(display=display)
        (options, args) = cli.parse()
        sys.exit(cli.run(options, args))
    except AnsibleError as e:
        display.error(str(e))
        sys.exit(1)
    except KeyboardInterrupt:
        display.error("interrupted")
        sys.exit(1)