#!/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()