#!/usr/bin/env python
"""
Creates a new task with corresponding description and tags.

Description and tags can be supplied via commandline through `-d` and `-t` options,
or interactively by using the options without supplying a string for them. E.g.:

`mutt2task`                       => task: Reply to <subject> from <sender>
`mutt2task -d "hello" -t one two` => task: hello +one +two
`mutt2task -d -t`                 => asks you interactively for description and tags
"""

import argparse
import email
import sys
import re

from tasklib import TaskWarrior, Task


def get_args():
    parser = argparse.ArgumentParser(
        description="Creates a task with given message and annotates the task with message id"
    )
    parser.add_argument(
        "-d",
        "--description",
        nargs="?",
        const=True,
        default=None,
        help="Supply a description for the task. Use the option as a flag to supply description interactively.",
    )
    parser.add_argument(
        "-t",
        "--tags",
        nargs="*",
        help="Supply any number of tags for the task. Use the option as a flag to supply tags interactively.",
    )
    parser.add_argument(
        "-c",
        "--clean",
        action="store_true",
        help="Remove subject annoyances like RE FWD on a best-effort basis.",
    )
    return parser.parse_args()


args = get_args()

def clean_subject(subject):
    to_remove = ["fwd", "re", "fw", "aw", "wg", "sv", "vs", "ref", "tr"]
    for abbrev in to_remove:
        patt = re.compile(r"^{}(?: |:)\s*".format(abbrev), re.IGNORECASE)
        subject = patt.sub("", subject)
    return subject


def get_task_description(message):
    subject = clean_subject(message["subject"]) if args.clean else message["subject"]
    description = 'Reply to "{}" from {}'.format(
        subject, message["from"].split(" <")[0]
    )
    # automatically set description if one provided
    if args.description and isinstance(args.description, str):
        description = args.description
    # otherwise let user enter one if option has been passed
    elif args.description:
        inp = input("Enter task description or press enter for default: ")
        description = inp if inp else description
    return description


def get_task_tags():
    tags = ["mail"]
    if args.tags and len(args.tags) > 0:
        tags = sum([tag.split(" ") for tag in args.tags], [])
    elif args.tags is not None and len(args.tags) == 0:
        inp = input("Enter task tags or press enter for default: ")
        tags = inp.split(" ") if inp else tags
    return tags


def main():
    try:
        message = email.message_from_file(sys.stdin)
        if not message:
            print("Something went wrong, cannot parse mail.")
            sys.exit(1)
        tw = TaskWarrior("~/.local/share/task", create=False)
        sys.stdin = open("/dev/tty")  # make user able to add input again
        task = Task(tw, description=get_task_description(message), tags=get_task_tags())
        task.save()
        task.add_annotation(message['message-id'])
    except Exception as e:
        print(e)
        sys.exit(2)


if __name__ == "__main__":
    main()