package com.tomer.alwayson.receivers;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.telephony.TelephonyManager;

import java.util.Date;

/*
 * Created by Gabe Sechan user on stackoverflow
 * http://stackoverflow.com/a/15564021/3057931
 */

public abstract class PhonecallReceiver extends BroadcastReceiver {

    //The receiver will be recreated whenever android feels like it.  We need a static variable to remember data between instantiations

    private static int lastState = TelephonyManager.CALL_STATE_IDLE;
    private static Date callStartTime;
    private static boolean isIncoming;
    private static String savedNumber;  //because the passed incoming is only valid in ringing


    @Override
    public void onReceive(Context context, Intent intent) {

        //We listen to two intents.  The new outgoing call only tells us of an outgoing call.  We use it to get the number.
        if (intent.getAction().equals("android.intent.action.NEW_OUTGOING_CALL")) {
            savedNumber = intent.getExtras().getString("android.intent.extra.PHONE_NUMBER");
        } else {
            String stateStr = intent.getExtras().getString(TelephonyManager.EXTRA_STATE);
            String number = intent.getExtras().getString(TelephonyManager.EXTRA_INCOMING_NUMBER);
            int state = 0;
            if (stateStr.equals(TelephonyManager.EXTRA_STATE_IDLE)) {
                state = TelephonyManager.CALL_STATE_IDLE;
            } else if (stateStr.equals(TelephonyManager.EXTRA_STATE_OFFHOOK)) {
                state = TelephonyManager.CALL_STATE_OFFHOOK;
            } else if (stateStr.equals(TelephonyManager.EXTRA_STATE_RINGING)) {
                state = TelephonyManager.CALL_STATE_RINGING;
            }


            onCallStateChanged(context, state, number);
        }
    }

    //Derived classes should override these to respond to specific events of interest
    protected abstract void onIncomingCallReceived(Context ctx, String number, Date start);

    protected abstract void onIncomingCallAnswered(Context ctx, String number, Date start);

    protected abstract void onIncomingCallEnded(Context ctx, String number, Date start, Date end);

    protected abstract void onOutgoingCallStarted(Context ctx, String number, Date start);

    protected abstract void onOutgoingCallEnded(Context ctx, String number, Date start, Date end);

    protected abstract void onMissedCall(Context ctx, String number, Date start);

    public void onCallStateChanged(Context context, int state, String number) {
        if (lastState == state) {
            return;
        }
        switch (state) {
            case TelephonyManager.CALL_STATE_RINGING:
                isIncoming = true;
                callStartTime = new Date();
                savedNumber = number;
                onIncomingCallReceived(context, number, callStartTime);
                break;
            case TelephonyManager.CALL_STATE_OFFHOOK:
                if (lastState != TelephonyManager.CALL_STATE_RINGING) {
                    isIncoming = false;
                    callStartTime = new Date();
                    onOutgoingCallStarted(context, savedNumber, callStartTime);
                } else {
                    isIncoming = true;
                    callStartTime = new Date();
                    onIncomingCallAnswered(context, savedNumber, callStartTime);
                }

                break;
            case TelephonyManager.CALL_STATE_IDLE:
                if (lastState == TelephonyManager.CALL_STATE_RINGING) {
                    onMissedCall(context, savedNumber, callStartTime);
                } else if (isIncoming) {
                    onIncomingCallEnded(context, savedNumber, callStartTime, new Date());
                } else {
                    onOutgoingCallEnded(context, savedNumber, callStartTime, new Date());
                }
                break;
        }
        lastState = state;
    }
}