#!/usr/bin/env python3

# nixos-config - My current NixOS configuration
#
# Copyright (C) 2025 Benedikt Peetz <benedikt.peetz@b-peetz.de>
# Copyright 2016 - 2021, 2023, Gothenburg Bit Factory
# SPDX-License-Identifier: GPL-3.0-or-later
#
# This file is part of my nixos-config.
#
# You should have received a copy of the License along with this program.
# If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.

import json
import subprocess
import sys

# Hook should extract all the following for use as Timewarrior tags:
#   UUID
#   Project
#   Tags
#   Description
#   UDAs

try:
    input_stream = sys.stdin.buffer
except AttributeError:
    input_stream = sys.stdin


MAX_ACTIVE = 1


def extract_tags_from(json_obj) -> [str]:
    # Extract attributes for use as tags.
    tags = [json_obj["description"]]

    if "project" in json_obj:
        tags.append(json_obj["project"])

    if "tags" in json_obj:
        if type(json_obj["tags"]) is str:
            # Usage of tasklib (e.g. in taskpirate) converts the tag list into a string
            # If this is the case, convert it back into a list first
            # See https://github.com/tbabej/taskpirate/issues/11
            tags.extend(json_obj["tags"].split(","))
        else:
            tags.extend(json_obj["tags"])

    return tags


def extract_annotation_from(json_obj):
    if "annotations" not in json_obj:
        return "''"

    return json_obj["annotations"][0]["description"]


def main(old, new):
    start_or_stop = ""

    # Started task.
    if "start" in new and "start" not in old:
        # Prevent this task from starting if "task +ACTIVE count" is greater than "MAX_ACTIVE".
        p = subprocess.Popen(
            ["task", "+ACTIVE", "status:pending", "count", "rc.verbose:off"],
            stdout=subprocess.PIPE,
        )
        out, err = p.communicate()
        count = int(out.rstrip())
        if count >= MAX_ACTIVE:
            print(
                f"Only {MAX_ACTIVE} task(s) can be active at a time.",
            )
            sys.exit(1)
        else:
            start_or_stop = "start"

    # Stopped task.
    elif ("start" not in new or "end" in new) and "start" in old:
        start_or_stop = "stop"

    if start_or_stop:
        tags = extract_tags_from(new)

        subprocess.call(["timew", start_or_stop] + tags + [":yes"])

    # Modifications to task other than start/stop
    elif "start" in new and "start" in old:
        old_tags = extract_tags_from(old)
        new_tags = extract_tags_from(new)

        if old_tags != new_tags:
            subprocess.call(["timew", "untag", "@1"] + old_tags + [":yes"])
            subprocess.call(["timew", "tag", "@1"] + new_tags + [":yes"])

        old_annotation = extract_annotation_from(old)
        new_annotation = extract_annotation_from(new)

        if old_annotation != new_annotation:
            subprocess.call(["timew", "annotate", "@1", new_annotation])


if __name__ == "__main__":
    old = json.loads(input_stream.readline().decode("utf-8", errors="replace"))
    new = json.loads(input_stream.readline().decode("utf-8", errors="replace"))
    print(json.dumps(new))
    main(old, new)