#!/usr/bin/env python3

import argparse
import os
import sys
import textwrap
import urllib.parse
import zipfile
from typing import Any, Callable, Dict, List

import requests
from requests import Response

red = '\033[91m'  # type: str
green = '\033[92m'  # type: str
end_format = '\033[0m'  # type: str
bold = '\033[1m'  # type: str

bots_dir = '.bots'  # type: str


def pack(options: argparse.Namespace) -> None:
    # Basic sanity checks for input.
    if not options.path:
        print('tools/deploy: Path to bot folder not specified.')
        sys.exit(1)
    if not options.config:
        print('tools/deploy: Path to zuliprc not specified.')
        sys.exit(1)
    if not options.main:
        print('tools/deploy: No main bot file specified.')
        sys.exit(1)
    if not os.path.isfile(options.config):
        print('pack: Config file not found at path: {}.'.format(options.config))
        sys.exit(1)
    if not os.path.isdir(options.path):
        print('pack: Bot folder not found at path: {}.'.format(options.path))
        sys.exit(1)
    main_path = os.path.join(options.path, options.main)
    if not os.path.isfile(main_path):
        print('pack: Bot main file not found at path: {}.'.format(main_path))
        sys.exit(1)

    # Main logic for packing the bot.
    if not os.path.exists(bots_dir):
        os.makedirs(bots_dir)
    zip_file_path = os.path.join(bots_dir, options.botname + ".zip")
    zip_file = zipfile.ZipFile(zip_file_path, 'w', zipfile.ZIP_DEFLATED)
    # Pack the complete bot folder
    for root, dirs, files in os.walk(options.path):
        for file in files:
            file_path = os.path.join(root, file)
            zip_file.write(file_path, os.path.relpath(file_path, options.path))
    # Pack the zuliprc
    zip_file.write(options.config, 'zuliprc')
    # Pack the config file for the botfarm.
    bot_config = textwrap.dedent(
        '''\
        [deploy]
        bot={}
        zuliprc=zuliprc
        '''.format(
            options.main
        )
    )
    zip_file.writestr('config.ini', bot_config)
    zip_file.close()
    print('pack: Created zip file at: {}.'.format(zip_file_path))


def check_common_options(options: argparse.Namespace) -> None:
    if not options.server:
        print('tools/deploy: URL to Botfarm server not specified.')
        sys.exit(1)
    if not options.token:
        print('tools/deploy: Botfarm deploy token not specified.')
        sys.exit(1)


def handle_common_response_without_data(
    response: Response, operation: str, success_message: str
) -> bool:
    return handle_common_response(
        response=response,
        operation=operation,
        success_handler=lambda r: print('{}: {}'.format(operation, success_message)),
    )


def handle_common_response(
    response: Response, operation: str, success_handler: Callable[[Dict[str, Any]], Any]
) -> bool:
    if response.status_code == requests.codes.ok:
        response_data = response.json()
        if response_data['status'] == 'success':
            success_handler(response_data)
            return True
        elif response_data['status'] == 'error':
            print('{}: {}'.format(operation, response_data['message']))
            return False
        else:
            print('{}: Unexpected success response format'.format(operation))
            return False
    if response.status_code == requests.codes.unauthorized:
        print('{}: Authentication error with the server. Aborting.'.format(operation))
    else:
        print('{}: Error {}. Aborting.'.format(operation, response.status_code))
    return False


def upload(options: argparse.Namespace) -> None:
    check_common_options(options)
    file_path = os.path.join(bots_dir, options.botname + '.zip')
    if not os.path.exists(file_path):
        print('upload: Could not find bot package at {}.'.format(file_path))
        sys.exit(1)
    files = {'file': open(file_path, 'rb')}
    headers = {'key': options.token}
    url = urllib.parse.urljoin(options.server, 'bots/upload')
    response = requests.post(url, files=files, headers=headers)
    result = handle_common_response_without_data(
        response, 'upload', 'Uploaded the bot package to botfarm.'
    )
    if result is False:
        sys.exit(1)


def clean(options: argparse.Namespace) -> None:
    file_path = os.path.join(bots_dir, options.botname + '.zip')
    if os.path.exists(file_path):
        os.remove(file_path)
        print('clean: Removed {}.'.format(file_path))
    else:
        print('clean: File \'{}\' not found.'.format(file_path))


def process(options: argparse.Namespace) -> None:
    check_common_options(options)
    headers = {'key': options.token}
    url = urllib.parse.urljoin(options.server, 'bots/process')
    payload = {'name': options.botname}
    response = requests.post(url, headers=headers, json=payload)
    result = handle_common_response_without_data(
        response, 'process', 'The bot has been processed by the botfarm.'
    )
    if result is False:
        sys.exit(1)


def start(options: argparse.Namespace) -> None:
    check_common_options(options)
    headers = {'key': options.token}
    url = urllib.parse.urljoin(options.server, 'bots/start')
    payload = {'name': options.botname}
    response = requests.post(url, headers=headers, json=payload)
    result = handle_common_response_without_data(
        response, 'start', 'The bot has been started by the botfarm.'
    )
    if result is False:
        sys.exit(1)


def stop(options: argparse.Namespace) -> None:
    check_common_options(options)
    headers = {'key': options.token}
    url = urllib.parse.urljoin(options.server, 'bots/stop')
    payload = {'name': options.botname}
    response = requests.post(url, headers=headers, json=payload)
    result = handle_common_response_without_data(
        response, 'stop', 'The bot has been stopped by the botfarm.'
    )
    if result is False:
        sys.exit(1)


def prepare(options: argparse.Namespace) -> None:
    pack(options)
    upload(options)
    clean(options)
    process(options)


def log(options: argparse.Namespace) -> None:
    check_common_options(options)
    headers = {'key': options.token}
    if options.lines:
        lines = options.lines
    else:
        lines = None
    payload = {'name': options.botname, 'lines': lines}
    url = urllib.parse.urljoin(options.server, 'bots/logs/' + options.botname)
    response = requests.get(url, json=payload, headers=headers)
    result = handle_common_response(response, 'log', lambda r: print(r['logs']['content']))
    if result is False:
        sys.exit(1)


def delete(options: argparse.Namespace) -> None:
    check_common_options(options)
    headers = {'key': options.token}
    url = urllib.parse.urljoin(options.server, 'bots/delete')
    payload = {'name': options.botname}
    response = requests.post(url, headers=headers, json=payload)
    result = handle_common_response_without_data(
        response, 'delete', 'The bot has been removed from the botfarm.'
    )
    if result is False:
        sys.exit(1)


def list_bots(options: argparse.Namespace) -> None:
    check_common_options(options)
    headers = {'key': options.token}
    if options.format:
        pretty_print = True
    else:
        pretty_print = False
    url = urllib.parse.urljoin(options.server, 'bots/list')
    response = requests.get(url, headers=headers)
    result = handle_common_response(
        response, 'ls', lambda r: print_bots(r['bots']['list'], pretty_print)
    )
    if result is False:
        sys.exit(1)


def print_bots(bots: List[Any], pretty_print: bool) -> None:
    if pretty_print:
        print_bots_pretty(bots)
    else:
        for bot in bots:
            print('{}\t{}\t{}\t{}'.format(bot['name'], bot['status'], bot['email'], bot['site']))


def print_bots_pretty(bots: List[Any]) -> None:
    if len(bots) == 0:
        print('ls: No bots found on the botfarm')
    else:
        print('ls: There are the following bots on the botfarm:')
        name_col_len, status_col_len, email_col_len, site_col_len = 25, 15, 35, 35
        row_format = '{0} {1} {2} {3}'
        header = row_format.format(
            'NAME'.rjust(name_col_len),
            'STATUS'.rjust(status_col_len),
            'EMAIL'.rjust(email_col_len),
            'SITE'.rjust(site_col_len),
        )
        header_bottom = row_format.format(
            '-' * name_col_len,
            '-' * status_col_len,
            '-' * email_col_len,
            '-' * site_col_len,
        )
        print(header)
        print(header_bottom)
        for bot in bots:
            row = row_format.format(
                bot['name'].rjust(name_col_len),
                bot['status'].rjust(status_col_len),
                bot['email'].rjust(email_col_len),
                bot['site'].rjust(site_col_len),
            )
            print(row)


def main() -> None:
    usage = """tools/deploy <command> <bot-name> [options]

This is tool meant to easily deploy bots to a Zulip Bot Farm.

First, get your deploy token from the Botfarm server. We recommend saving your
deploy-token as $TOKEN and the bot-farm server as $SERVER. If you want to manually
provide the SERVER and TOKEN values, use the --server="https://my-server.com"
and --token="my-access-token" flags with each command. To deploy, run:

    tools/deploy prepare mybot \\
        --path=/path/to/bot/directory --config=/path/to/zuliprc --main=main_bot_file.py

Now, your bot is ready to start.

    tools/deploy start mybot

To stop the bot, use:

    tools/deploy stop mybot

To get logs of the bot, use:
    tools/deploy log mybot

To delete the bot, use:

    tools/deploy delete mybot

To list user's bots, use:

    tools/deploy ls

"""
    parser = argparse.ArgumentParser(usage=usage)
    parser.add_argument('command', help='Command to run.')
    parser.add_argument('botname', nargs='?', help='Name of bot to operate on.')
    parser.add_argument(
        '--server',
        '-s',
        metavar='SERVERURL',
        default=os.environ.get('SERVER', ''),
        help='Url of the Zulip Botfarm server.',
    )
    parser.add_argument(
        '--token', '-t', default=os.environ.get('TOKEN', ''), help='Deploy Token for the Botfarm.'
    )
    parser.add_argument('--path', '-p', help='Path to the bot directory.')
    parser.add_argument('--config', '-c', help='Path to the zuliprc file.')
    parser.add_argument(
        '--main', '-m', help='Path to the bot\'s main file, relative to the bot\'s directory.'
    )
    parser.add_argument('--lines', '-l', help='Number of lines in log required.')
    parser.add_argument(
        '--format', '-f', action='store_true', help='Print user\'s bots in human readable format'
    )
    options = parser.parse_args()
    if not options.command:
        print('tools/deploy: No command specified.')
        sys.exit(1)
    if not options.botname and options.command not in ['ls']:
        print('tools/deploy: No bot name specified. Please specify a name like \'my-custom-bot\'')
        sys.exit(1)

    commands = {
        'pack': pack,
        'upload': upload,
        'clean': clean,
        'prepare': prepare,
        'process': process,
        'start': start,
        'stop': stop,
        'log': log,
        'delete': delete,
        'ls': list_bots,
    }
    if options.command in commands:
        commands[options.command](options)
    else:
        print('tools/deploy: No command \'{}\' found.'.format(options.command))


if __name__ == '__main__':
    main()