"""
Command line interface (CLI) for LocalStack.

Usage:
  localstack [options] <command> [ <args> ... ]
  localstack (-v | --version)
  localstack (-h | --help)

Commands:%s

Options:
  -d --debug                  Show verbose debug output
  -h --help                   Show this screen
  -v --version                Show version
%s
"""

import os
import sys
import logging
import traceback
from docopt import docopt
from localstack import config, constants
from localstack.utils import bootstrap
from localstack.utils.bootstrap import (
    get_main_container_id, start_infra_in_docker, start_infra_locally, run, docker_container_running,
    get_main_container_ip, get_main_container_name, get_docker_image_details, get_server_version,
    validate_localstack_config, setup_logging)

# Note: make sure we don't have other imports at the root level here

# set up logger
LOG = logging.getLogger(__name__)


def cmd_infra(argv, args):
    """
Usage:
  localstack infra <subcommand> [options]

Commands:
  infra start       Start the local infrastructure

Options:
  --docker          Run the infrastructure in a Docker container (default)
  --host            Run the infrastructure on the local host (deprecated / not supported)
    """
    if argv[0] == 'start':
        argv = ['infra', 'start'] + argv[1:]
        args['<command>'] = 'infra'
        args['<args>'] = ['start'] + args['<args>']
    args.update(docopt(cmd_infra.__doc__.strip(), argv=argv))
    if args['<subcommand>'] == 'start':
        if args['--docker'] and args['--host']:
            raise Exception('Please specify either --docker or --host')
        print('Starting local dev environment. CTRL-C to quit.')
        in_docker = args['--docker'] or not args['--host']
        if in_docker:
            start_infra_in_docker()
        else:
            start_infra_locally()


def cmd_config(argv, args):
    """
Usage:
  localstack config <subcommand> [options]

Commands:
  config validate       Validate local configurations (e.g. docker-compose)

Options:
  --file=<>          Use custom docker compose file (default: docker-compose.yml)
    """
    args.update(docopt(cmd_config.__doc__.strip(), argv=argv))

    if args['<subcommand>'] == 'validate':
        docker_compose_file_name = args.get('--file') or 'docker-compose.yml'
        validate_localstack_config(docker_compose_file_name)
    else:
        raise Exception('Please specify a valid command')


def cmd_web(argv, args):
    """
Usage:
  localstack web <subcommand> [options]

Commands:
  web start           Start the Web dashboard (Note: deprecated and no longer supported!)

Options:
  --port=<>           Network port for running the Web server (default: 8080)
    """
    if len(argv) <= 1 or argv[1] != 'start':
        argv = ['web', 'start'] + argv[1:]
        args['<args>'] = ['start'] + args['<args>']
    args.update(docopt(cmd_web.__doc__.strip(), argv=argv))
    if args['<subcommand>'] == 'start':
        import localstack.dashboard.api
        port = args['--port'] or config.PORT_WEB_UI
        localstack.dashboard.api.serve(port)


def cmd_ssh(argv, args):
    """
Usage:
  localstack ssh [options]

Commands:
  ssh               Obtain a shell in the running LocalStack container

Options:
    """
    args.update(docopt(cmd_ssh.__doc__.strip(), argv=argv))
    if not docker_container_running(config.MAIN_CONTAINER_NAME):
        raise Exception('Expected 1 running "%s" container, but found none' % config.MAIN_CONTAINER_NAME)
    try:
        process = run('docker exec -it %s bash' % config.MAIN_CONTAINER_NAME, tty=True)
        process.wait()
    except KeyboardInterrupt:
        pass


def cmd_status(argv, args):
    """
Usage:
  localstack status
    """
    args.update(docopt(cmd_status.__doc__.strip(), argv=argv))
    print_status()


def print_status():
    print('Base version:\t\t%s' % get_server_version())
    img = get_docker_image_details()
    print('Docker image:\t\tTag %s, ID %s, Created %s' % (img['tag'], img['id'], img['created']))
    cont_name = config.MAIN_CONTAINER_NAME
    running = docker_container_running(cont_name)
    cont_status = 'stopped'
    if running:
        cont_status = 'running (name: "%s", IP: %s)' % (get_main_container_name(), get_main_container_ip())
    print('Container status:\t%s' % cont_status)


def print_version(in_docker=False):
    print()
    print('LocalStack version: %s' % constants.VERSION)
    if in_docker:
        id = get_main_container_id()
        if id:
            print('LocalStack Docker image id: %s' % id[:12])

    if config.LOCALSTACK_BUILD_DATE:
        print('LocalStack build date: %s' % config.LOCALSTACK_BUILD_DATE)

    if config.LOCALSTACK_BUILD_GIT_HASH:
        print('LocalStack build git hash: %s' % config.LOCALSTACK_BUILD_GIT_HASH)

    print()


def main():
    LOG.info('LocalStack version: %s' % constants.VERSION)
    # set basic CLI commands
    config.CLI_COMMANDS['infra'] = {
        'description': 'Commands to manage the infrastructure',
        'function': cmd_infra
    }
    config.CLI_COMMANDS['start'] = {
        'description': 'Shorthand to start the infrastructure',
        'function': cmd_infra
    }
    config.CLI_COMMANDS['web'] = {
        'description': 'Commands to manage the Web dashboard (deprecated)',
        'function': cmd_web
    }
    config.CLI_COMMANDS['ssh'] = {
        'description': 'Shorthand to obtain a shell in the running container',
        'function': cmd_ssh
    }
    config.CLI_COMMANDS['status'] = {
        'description': 'Obtain status details about the installation',
        'function': cmd_status
    }
    config.CLI_COMMANDS['config'] = {
        'description': 'Validate docker configurations',
        'function': cmd_config
    }

    # load CLI plugins
    bootstrap.load_plugins(scope=bootstrap.PLUGIN_SCOPE_COMMANDS)

    # create final usage string
    additional_params = []
    additional_commands = ''
    for cmd in sorted(config.CLI_COMMANDS.keys()):
        cmd_details = config.CLI_COMMANDS[cmd]
        additional_commands += '\n  %s%s%s' % (cmd, (20 - len(cmd)) * ' ', cmd_details['description'])
        for param in cmd_details.get('parameters', []):
            additional_params.append(param)
    additional_params = '\n'.join(additional_params)
    doc_string = __doc__ % (additional_commands, additional_params)

    args = docopt(doc_string, options_first=True)

    if args['--version']:
        print(constants.VERSION)
        sys.exit(0)

    if args['--debug']:
        config.DEBUG = True
        os.environ['DEBUG'] = '1'

    # set up logging (after DEBUG has been configured)
    setup_logging()

    # invoke subcommand
    argv = [args['<command>']] + args['<args>']
    subcommand = config.CLI_COMMANDS.get(args['<command>'])
    if subcommand:
        try:
            subcommand['function'](argv, args)
        except Exception as e:
            if os.environ.get('DEBUG') in ['1', 'true']:
                print(traceback.format_exc())
            print('ERROR: %s' % e)
            sys.exit(1)
    else:
        print('ERROR: Invalid command "%s"' % args['<command>'])
        sys.exit(1)


if __name__ == '__main__':
    main()
