package org.gingercal;

import java.util.List;

import android.app.AlarmManager;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;

import org.gingercal.Model.Ev;

/** Local notifications before timed events, driven from the cached agenda. */
public final class Reminders {
    private Reminders() {}

    static PendingIntent alarmIntent(Context c) {
        Intent i = new Intent(c, AlarmReceiver.class);
        i.setAction(AlarmReceiver.REMIND);
        return PendingIntent.getBroadcast(c, 2, i, 0x08000000 /* FLAG_UPDATE_CURRENT */);
    }

    public static void schedule(Context c) {
        AlarmManager am = (AlarmManager) c.getSystemService("alarm");
        PendingIntent pi = alarmIntent(c);
        am.cancel(pi);
        int m = App.remind(c);
        if (m < 0) return;
        long now = System.currentTimeMillis();
        long notified = App.prefs(c).getLong("notified", 0);
        long next = Db.get(c).nextStartAfter(Math.max(notified, now - 60000L));
        if (next < 0) return;
        am.set(0 /* RTC_WAKEUP */, Math.max(now + 1000, next - m * ICal.MIN), pi);
    }

    public static void fire(Context c) {
        int m = App.remind(c);
        if (m < 0) return;
        long now = System.currentTimeMillis();
        long notified = App.prefs(c).getLong("notified", 0);
        // never nag about things that started more than 30 minutes ago
        List<Ev> due = Db.get(c).startingBetween(Math.max(notified, now - 30 * ICal.MIN), now + m * ICal.MIN + 30000L);
        NotificationManager nm = (NotificationManager) c.getSystemService("notification");
        long newest = notified;
        int icon = App.sysDrawable(c, "ic_popup_reminder");
        if (icon == 0) icon = App.sysDrawable(c, "ic_dialog_info");
        for (Ev e : due) {
            Intent open = new Intent(c, MainActivity.class);
            open.setFlags(0x10000000 /* FLAG_ACTIVITY_NEW_TASK */);
            PendingIntent pi = PendingIntent.getActivity(c, 0, open, 0);
            Notification n = new Notification(icon, e.title, e.start);
            String body = App.when(c, e) + (e.location.length() > 0 ? "  ·  " + e.location : "");
            n.setLatestEventInfo(c, e.title.length() > 0 ? e.title : L.t("(no title)"), body, pi);
            n.flags |= 16; // FLAG_AUTO_CANCEL
            n.defaults = -1; // DEFAULT_ALL: sound, vibrate, lights
            nm.notify((e.href + e.start).hashCode(), n);
            if (e.start > newest) newest = e.start;
        }
        if (newest != notified) App.prefs(c).edit().putLong("notified", newest).commit();
        schedule(c);
    }
}