#! /usr/bin/env cached-nix-shell
#! nix-shell -i python3 -p python3

"""Manage Taskwarrior notes"""

import argparse
import logging
import os
import sys
import datetime

NOTES_DIR = "~/kitaab/vimwiki/task-notes"
EDITOR = os.environ["EDITOR"]

logging.basicConfig(level=logging.DEBUG)


def write_note(task_id: int):
    """Open `$EDITOR` to take notes about task with ID `task_id`."""
    task_uuid = os.popen(f"task _get {task_id}.uuid").read().rstrip()

    if not task_uuid:
        logging.error(f"{task_id} has no UUID!")
        sys.exit(1)

    logging.debug(f"Task {task_id} has UUID {task_uuid}")

    notes_dir = os.path.expanduser(NOTES_DIR)
    os.makedirs(notes_dir, exist_ok=True)
    notes_basename = f"{task_uuid}.md"
    notes_file = os.path.join(notes_dir, notes_basename)
    logging.debug(f"Notes file is {notes_file}")

    if not os.path.exists(notes_file):
        logging.info("Adding description to empty notes file")
        task_description = os.popen(f"task _get {task_id}.description").read()
        task_project = os.popen(f"task _get {task_id}.project").read().strip("\n")
        task_tags = os.popen(f"task _get {task_id}.tags").read().split(",")
        if len(task_tags):
            task_tags = ":".join(task_tags).strip("\n") + ":"
        time = datetime.datetime.now().strftime("%y-%m-%d %H:%M")

        with open(notes_file, "w") as f:
            f.write(f"%title: {task_description}")
            f.write(f":task:{task_project}:{task_tags if len(task_tags) else ''}\n")
            f.write(f"%date: {time}\n\n")
            f.flush()

    os.execlp(EDITOR, EDITOR, notes_file)


if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Write Taskwarrior notes")
    parser.add_argument('task_id', metavar='ID', type=int, help="ID of the task to note")
    args = parser.parse_args()

    write_note(args.task_id)