import * as Notifications from "expo-notifications";
import { Platform } from "react-native";

Notifications.setNotificationHandler({
  handleNotification: async () => ({
    shouldShowAlert: true,
    shouldPlaySound: true,
    shouldSetBadge: false,
    shouldShowBanner: true,
    shouldShowList: true,
  }),
});

export async function ensureNotificationPermissions() {
  const settings = await Notifications.getPermissionsAsync();
  if (settings.granted) return true;
  const req = await Notifications.requestPermissionsAsync();
  return req.granted;
}

export async function scheduleDoseReminder(opts: {
  title: string;
  body: string;
  secondsFromNow: number;
  data?: Record<string, string>;
}) {
  await ensureNotificationPermissions();
  return Notifications.scheduleNotificationAsync({
    content: {
      title: opts.title,
      body: opts.body,
      data: opts.data,
      categoryIdentifier: "dose",
    },
    trigger: {
      type: Notifications.SchedulableTriggerInputTypes.TIME_INTERVAL,
      seconds: Math.max(5, opts.secondsFromNow),
      repeats: false,
    },
  });
}

export async function scheduleEscalationCheck(opts: {
  title: string;
  body: string;
  graceSeconds: number;
  data?: Record<string, string>;
}) {
  await ensureNotificationPermissions();
  return Notifications.scheduleNotificationAsync({
    content: {
      title: opts.title,
      body: opts.body,
      data: { ...opts.data, type: "escalation" },
    },
    trigger: {
      type: Notifications.SchedulableTriggerInputTypes.TIME_INTERVAL,
      seconds: Math.max(10, opts.graceSeconds),
      repeats: false,
    },
  });
}

export function androidChannel() {
  if (Platform.OS === "android") {
    return Notifications.setNotificationChannelAsync("gishen-reminders", {
      name: "Gishen reminders",
      importance: Notifications.AndroidImportance.HIGH,
    });
  }
  return Promise.resolve();
}