import sys
import csv
import os
# This is a local script are we supposed to indicate that?
import prompt_window
import time
from datetime import datetime, timedelta
from pathlib import Path
from pytz import timezone
from playsound import playsound

import pytz

WORK_MIN = 25  # Minutes for a work session
SHORT_MIN = 5  # Minutes for a short break
LONG_MIN = 15  # Minutes for a long break (NOT YET IMPLEMENTED)
INTERRUPTED_MIN = 1 # Minimum minutes to ask to record an interrupted Pomodoro
QUIET = True

def pomodoro_prompt_plan(whatdid = ''):
    """ Ask about what task will be worked on (showing last thing worked on)
    """
    text = "What're you gonna do?"
    # NOTE: If we can do system notifications that when clicked will focus the terminal
    # running pomodoro prompt, that might be even better than the pop-up GUI text entry.
    whatnext = prompt_window.prompt(prompt=text, task=whatdid)
    # Pressing cancel returns None, but we want to just treat it as an empty string.
    if whatnext is None:
        whatnext = ''
    return whatnext

def pomodoro_prompt_report(whatnext):
    """ Ask what task was completed, showing the last task claimed to be being worked on
    """
    text = "What'd you do?"
    whatdid = prompt_window.prompt(prompt=text, task=whatnext)
    # Pressing cancel returns None, but we want to just treat it as an empty string.
    if whatdid is None:
        whatdid = ''
    return whatdid

def quit_prompt():
    """ Confirm exit or start a new pomodoro
    """
    print('\nPress p to start a new pomodoro, q to quit')
    choice = input('p/q: ').strip().lower()
    if choice in ('p', 'pomodoro'):
        return
    elif choice in ('q', 'quit', 'exit'):
        sys.exit(0)
    else:
        quit_prompt()

def log_step(text, utc_start, end_section=False):
    """ Write detailed log of all events
    """
    timelog_file = Path(prepare_file(utc_start, ext='log', daily=True))
    timelog_file.touch(exist_ok=True)
    with timelog_file.open('a') as timelog:
        timelog.write(text + '\n')
        if end_section:
            timelog.write('\n\n')

def record_task(whatnext, whatdid, start, end=None):
    """ Record completed pomodoro to CSV
    """
    if end is None:
        end = datetime.now(pytz.utc)

    filepath = prepare_file(start)
    if not os.path.isfile(filepath):
        with open(filepath, 'w', newline='') as csvfile:
            log = csv.writer(csvfile)
            log.writewrow(['started', 'recorded', 'description', 'intention'])

    with open(filepath, 'a', newline='') as csvfile:
        timewriter = csv.writer(csvfile)
        timewriter.writerow([start, end, whatdid, whatnext])

def str_minutes(time_diff):
    """ Return at least whole seconds from a time difference
    """
    return str(time_diff).split('.')[0]

def countdown_to(until):
    """ Display a timer counting down to until
    """
    while datetime.now(pytz.utc) <= until:
        to_go = until-datetime.now(pytz.utc)
        print('\r', str_minutes(to_go), sep='', end='')
        time.sleep(1)

def prepare_file(utc_start, ext='csv', daily=False):
    # Ensure log directory exists.
    if not os.path.exists('log'):
        os.makedirs('log')
    # We consider 3am the switchover to a new day, so we skip extra math
    # and use Pacific time to get three hours later than our Eastern time.
    logpath_tz = timezone('US/Pacific')
    logpath_date = utc_start.astimezone(logpath_tz)
    timelog_path = 'log/' + str(logpath_date.year);
    if (daily):
        timelog_path += '-' \
        + format(logpath_date.month, '02') + '-' \
        + format(logpath_date.day, '02') + '.log'
    timelog_path += '.' + ext
    return timelog_path

def main():
    whatdid = ''
    while True:
        whatnext = pomodoro_prompt_plan(whatdid)

        start = datetime.now(pytz.utc)
        end = start + timedelta(minutes=WORK_MIN)
        log_step('Start with plan: ' + whatnext, start)
        try:
            print('Working on: ' + whatnext)
            countdown_to(end)
            if not QUIET:
                playsound('res/timesup.aac')
            whatdid = pomodoro_prompt_report(whatnext)
            record_task(whatnext, whatdid, start)
            log_step('Completed pomodoro: ' + whatdid, start, True)
            print('\nWorked on: ' + whatdid)

            print('Break time!')
            # We're taking a break.  Clear out task start/end times.
            start = None
            end = datetime.now(pytz.utc) + timedelta(minutes=SHORT_MIN)
            countdown_to(end)
            if not QUIET:
                playsound('res/timesup.aac')
            continue
        except KeyboardInterrupt:
            if start is None:
                quit_prompt()
                continue
            time_spent = datetime.now(pytz.utc) - start
            if time_spent < timedelta(minutes=INTERRUPTED_MIN):
                quit_prompt()
                continue
            time_spent_str = str_minutes(time_spent)
            print('\n{} time spent, save?'.format(time_spent_str))
            choice = input('[y]/n: ').strip()
            if choice.lower() in ('y', 'yes', ''):
                whatdid = pomodoro_prompt_report(whatnext)
                record_task(whatnext, whatdid, start)
                log_step('Incomplete (' + time_spent_str + ') pomodoro: ' + whatdid, start, True)
            quit_prompt()
        else:
            print('What did you break?')
            # If we somehow end up here, try a last-ditch effort to save.
            record_task(whatnext, 'Incomplete, interrupted task:' + whatnext, start)
            log_step('Incomplete, interrupted task:' + whatnext, start, True)

if __name__ == '__main__':
    main()