#!/usr/bin/env python3

from typing import Any, List, Dict, Callable

import os
import sys
import argparse
import zipfile
import textwrap
import requests
import urllib
import json
from urllib import parse
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()