mpp/src/main/kotlin/SendService.kt

package com.pleasantprogrammer.mpp;

import android.app.AlarmManager
import android.app.IntentService
import android.app.PendingIntent
import android.content.Context
import android.content.Intent
import android.content.SharedPreferences
import android.telephony.SmsManager
import android.util.Log

class SendService : IntentService("SendService") {

  companion object {
    val ACTION_SEND = "com.pleasantprogrammer.mpp.action.SEND"
    val ACTION_BOOT = "com.pleasantprogrammer.mpp.action.BOOT"

    val INTERVAL = 60 * 1000L

    fun makeSendIntent(ctx: Context): Intent {
      val intent = Intent(ACTION_SEND)
      intent.setClass(ctx, SendService::class.java)
      return intent
    }

    fun makeBootIntent(ctx: Context): Intent {
      val intent = Intent(ACTION_BOOT)
      intent.setClass(ctx, SendService::class.java)
      return intent
    }
  }

  val sharedPreferences: SharedPreferences by lazy {
    getSharedPreferences("store", Context.MODE_PRIVATE)
  }

  override fun onHandleIntent(intent: Intent) {
    if(intent.action == ACTION_SEND) {
      Log.i("SendService", "Sending request")
      val smsManager = SmsManager.getDefault()
      smsManager.sendTextMessage("5554", null, "GS99", null, null)
      sharedPreferences.edit().putLong("last_requested", System.currentTimeMillis()).commit()
      scheduleNext()
    }
    else if(intent.action == ACTION_BOOT) {
      Log.i("SendService", "Rescheduling because of restart")
      scheduleNext()
    }
  }

  fun scheduleNext() {
    val from = sharedPreferences.getLong("last_requested", -1)
    if(from < 0) return

    val pendingIntent = PendingIntent.getService(
        this, 0, makeSendIntent(this), PendingIntent.FLAG_ONE_SHOT
    )

    val alarmManager = getSystemService(Context.ALARM_SERVICE) as AlarmManager
    alarmManager.cancel(pendingIntent)
    alarmManager.set(AlarmManager.RTC_WAKEUP, from + INTERVAL, pendingIntent)
  }
}