#!/usr/bin/env python3

# From: https://gist.github.com/varunagrawal/2b93c5dc721520ff6876e940c420ab05
# This hooks script logs any finished tasks currently in the todo.txt file
# pointed to by its settings.
# The on-exit event is triggered once, after all processing is complete.

import re
import os
import sys
import subprocess
import options


def get_todo_block_date(line, todo_block_title):
    result = re.search(
        rf"^\[(\d{{4}}-\d{{2}}-\d{{2}}).*\] ({re.escape(todo_block_title)}$)?",
        line,
    )
    # we are entering todotxt data block
    if result and result[2]:
        return result[1]
    # we enter block but not one for todotxt
    elif result and not result[2]:
        return False
    # nothing changed, we didn't cross a date line
    return "same"


def parse_file(options):
    fname = options.jrnl_fname
    lines_to_delete = []
    with open(fname) as file:
        line_number = 0
        for line in file:
            line_number += 1

            todo_block = get_todo_block_date(line, options.todo_block_title)
            if todo_block == False:
                curdate = ""
                continue
            if todo_block != "same":
                curdate = todo_block
                continue
            if not curdate:
                continue

            completed_task = re.search(r"^(?:x|[x]) ((?:\([A-D]\))? ?.*)$", line)
            if completed_task and options.taskwarrior_log_completed:
                log_completed_to_taskwarrior(completed_task[1], curdate, options.dryrun)
                lines_to_delete.append(line_number)

        if lines_to_delete:
            delete_logged_tasks_from_file(fname, lines_to_delete, options.dryrun)


def get_prio_string(task_string):
    prio = re.search(r"^\(([ABC])\) (.*)$", task_string)
    prio_string = ""
    if prio:
        task_string = prio[2]
        if prio[1] == "A":
            prio_string = "prio:H"
        elif prio[1] == "B":
            prio_string = "prio:M"
        elif prio[1] == "C":
            prio_string = "prio:L"
    return prio_string


def log_completed_to_taskwarrior(task_string, date, dryrun):
    overrides = ["rc.context=none", "rc.verbose=nothing", "rc.hooks=0"]

    cmd = [
        "task",
        *overrides,
        "log",
        f'"{task_string}"',
        f"entry:{date}",
        f"end:{date}",
        get_prio_string(task_string),
    ]

    if dryrun:
        print(cmd)
        return

    subprocess.Popen(cmd)


def delete_logged_tasks_from_file(fname, lines, dryrun):
    if dryrun:
        print(f"deleting lines: {lines}")
        return

    cur_line = 0
    repl_file = fname + ".bak"
    with open(fname) as read_file, open(repl_file, "w") as write_file:
        for line in read_file:
            cur_line += 1
            if lines and cur_line == lines[0]:
                lines.pop(0)
                continue
            write_file.write(line)
    os.rename(repl_file, fname)


if __name__ == "__main__":
    parse_file(options.init())
    sys.exit(0)