Vaani/lib/features/sleep_timer/providers/sleep_timer_provider.dart

import 'package:flutter/material.dart';
import 'package:riverpod_annotation/riverpod_annotation.dart';
import 'package:vaani/features/player/providers/audiobook_player.dart';
import 'package:vaani/features/sleep_timer/core/sleep_timer.dart' as core;
import 'package:vaani/settings/app_settings_provider.dart';
import 'package:vaani/shared/extensions/time_of_day.dart';

part 'sleep_timer_provider.g.dart';

@Riverpod(keepAlive: true)
class SleepTimer extends _$SleepTimer {
  @override
  core.SleepTimer? build() {
    final sleepTimerSettings = ref.watch(sleepTimerSettingsProvider);
    if (!sleepTimerSettings.autoTurnOnTimer) {
      return null;
    }

    if ((!sleepTimerSettings.alwaysAutoTurnOnTimer) &&
        !shouldBuildRightNow(
          sleepTimerSettings.autoTurnOnTime,
          sleepTimerSettings.autoTurnOffTime,
        )) {
      return null;
    }

    var sleepTimer = core.SleepTimer(
      duration: sleepTimerSettings.defaultDuration,
      player: ref.watch(simpleAudiobookPlayerProvider),
    );
    ref.onDispose(sleepTimer.dispose);
    return sleepTimer;
  }

  void setTimer(Duration? resultingDuration, {bool notifyListeners = true}) {
    if (resultingDuration == null || resultingDuration.inSeconds == 0) {
      cancelTimer();
      return;
    }
    if (state != null) {
      state!.duration = resultingDuration;
      if (notifyListeners) {
        ref.notifyListeners();
      }
    } else {
      final timer = core.SleepTimer(
        duration: resultingDuration,
        player: ref.watch(simpleAudiobookPlayerProvider),
      );
      ref.onDispose(timer.dispose);
      state = timer;
      state!.startCountDown();
    }
  }

  void restartTimer() {
    state?.restartTimer();

    // ref.notifyListeners(); // see https://github.com/Dr-Blank/Vaani/pull/40 for more information on why this is commented out
  }

  void cancelTimer() {
    state?.dispose();
    state = null;
  }
}

bool shouldBuildRightNow(Duration autoTurnOnTime, Duration autoTurnOffTime) {
  final now = TimeOfDay.now();
  return now.isBetween(
    autoTurnOnTime.toTimeOfDay(),
    autoTurnOffTime.toTimeOfDay(),
  );
}