#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import cmd
import sys

from authority import SSHAuthority, SSLAuthority
from ca_manager import sign_request

__doc__= """
        Class to make a shell and interact with the user
        """

class CAManagerShell(cmd.Cmd, object):
    intro= """# LILiK CA Manager #
    Welcome to the certification authority shell.
    Type help or ? to list commands.
    """
    prompt= "(CA Manager)> "

    def __init__(self, ca_manager):
        super(CAManagerShell, self).__init__()
        self.ca_manager = ca_manager

    def do_ls_ca(self, l):
        'List the available certification authorities: LS_CA'
        for i, authority in enumerate(self.ca_manager.ca):
            print('- %d - %s' % (i, authority))

    def do_ls_requests(self, l):
        'List the available certification requests: LS_REQUESTS'
        print_available_requests(self.ca_manager)

    def do_describe_cas(self, l):
        'Show certification authority information: DESCRIBE_CAS'
        ca_id = l.split()[0]

        ca = self.ca_manager.ca[ca_id]

        if ca:
            ca_description = """
            Certification authority: %s
            --------------------------------------------------
            CA type: %s
            CA name: %s
            """

            ca_info = (
                    ca_id,
                    ca.__class__.__name__,
                    ca.name,
                    )

            print(ca_description % ca_info)
        else:
            print("No CA found for id: '%s'" % request_id)

    def do_describe_request(self, l):
        'Show sign request information: DESCRIBE_REQUEST'
        request_id = l.split()[0]

        request = self.ca_manager.request[request_id]

        if request:
            request_description = """
            Request %s
            --------------------------------------------------
            Request type: %s
            %s
            Key %s
            """

            request_info = (
                    request_id,
                    request.__class__.__name__,
                    request.fields,
                    request.key_data,
                    )

            print(request_description % request_info)
        else:
            print("No request found for id: '%s'" % request_id)

    def do_drop_request(self, l):
        'Delete a sign request: DROP_REQUEST'
        request_id = l.split()[0]

        del self.ca_manager.request[request_id]

    def do_gen_ssh(self, l):
        'Generate a SSH Certification authority'
        argv = l.split()
        ca_id = argv[0]
        self.ca_manager.ca[ca_id] = SSHAuthority

    def do_gen_ssl(self, l):
        'Generate a SSL Certification authority'
        argv = l.split()
        ca_id = argv[0]
        self.ca_manager.ca[ca_id] = SSLAuthority

    def do_sign_request(self, l):
        'Sign a request using a CA: SIGN_REQUEST ca_id request_id'
        argv = l.split()
        argc = len(argv)

        # argument number is too low
        if argc < 2:
            if argc == 0:
                # print available ca
                print("Available authority")
                print_available_authorities(self.ca_manager)

                print("==================")

                # print available requests
                print("Available request")
                print_available_requests(self.ca_manager)

            elif argc == 1:
                ca_type = None
                ca_id = argv[0]
                try:
                    ca_type = self.ca_manager.ca[ca_id].ca_type
                except Exception as e:
                    print ("Error: %s"%e)
                    return
                # print available requests
                print("Available request for CA %s (type %s)" % (ca_id, ca_type))
                print_available_requests(self.ca_manager, ca_type)

            print("==================")
            print("usage: sign_request autority request")
        else:
            authority_id, request_id  = argv[0], argv[1]

            sign_request(self.ca_manager, request_id, authority_id)

    def complete_sign_request(self, text, line, begidx, endidx):
        results = ''
        #too much magic
        argc = len(( "%send" % line ).split() )

        if argc == 2:
            results = [a[0] for a in self.ca_manager.ca if a[0].startswith(text)]
        elif argc == 3:
            ca_type = None
            try:
                ca_id = line.split()[1]
                ca_type = self.ca_manager.ca[ca_id].ca_type
            except Exception as e:
                print ("Error: %s"%e)
                return

            results = [a for a in self.ca_manager.request[ca_type] if str(a).startswith(text)]
        return results

    def complete(self, text, state):
        results = super().complete(text, state)
        if results is not None:
            return "%s "%results
        return results

    def do_quit(self, l):
        'Quit this shell'
        return True


def print_available_authorities(ca_manager):
    for i, ca_item  in enumerate(ca_manager.ca):
        print("- %d : %s" % (i , ca_item))

def print_available_requests(ca_manager):
    for i, request in enumerate(ca_manager.request):
        print("- %d : %s" % (i, request))