/**
 * Copyright (C) 2015 Sebastian Kappes
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.redirectapps.tvkill;

import android.content.Context;
import android.os.Build;

import java.util.Arrays;


public class Pattern {

    private int[] pattern;
    private int frequency;
    private boolean converted = false;

    //This method converts the remotes pattern, if this has not been done yet, and passes the converted pattern to the initiate-method.
    public void send(Context c) {

        if (!converted) {
            pattern = convert(pattern, frequency);
            converted = true;
        }
        initiate(c);

    }

    //This method initiates the remote's transmission.
    private void initiate(Context c) {
        Transmitter remote = new Transmitter(frequency, pattern);
        remote.transmit(c);
    }


    protected Pattern(int frequency, int[] pattern) {
        this.frequency = frequency;
        this.pattern = pattern;
    }

    protected Pattern(int[] ircode) {
        this.frequency = ircode[0];
        this.pattern = Arrays.copyOfRange(ircode, 1, ircode.length);
    }


    /*
     * The following method preforms calculations on the IR-codes in order to make them work on certain devices.
     *
     * Patterns have to be converted on devices running on Android Lollipop or newer and HTC devices.
     * Certain Samsung devices also require a converted Pattern, depending on their Android version.
     * Older devices including Samsung devices running on an android version older than 4.4.3 can use the unconverted patterns, in that case, this method simply returns the input data.
     *
     */
    private static int[] convert(int[] irData, int frequency) {

        // 1. Determine which conversion-algorithm shall be used (see the comment above this method for more details)
        byte convert = 0;
        //Devices running on Android Lollipop (Android 5.0.1 (API 21)) and beyond, HTC devices
        if (Build.VERSION.SDK_INT >= 21 || Build.MANUFACTURER.equalsIgnoreCase("HTC")) {
            convert = 1;
        } else {
            //Samsung devices running on anything lower than Android 5
            if (Build.MANUFACTURER.equalsIgnoreCase("SAMSUNG")) {
                int lastIdx = Build.VERSION.RELEASE.lastIndexOf(".");
                int VERSION_MR = Integer.valueOf(Build.VERSION.RELEASE.substring(lastIdx + 1));
                if (VERSION_MR < 3) {
                    // Samsung devices with Android-version before Android 4.4.2
                    //-> no calculations required
                    convert = 0;
                } else {
                    // Later version of Android 4.4.3
                    //-> use the special Samsung-formula
                    convert = 2;
                }
            }
        }

        // 2. Convert the patterns
        if (convert != 0) {
            for (int i = 0; i < irData.length; i++) {
                switch (convert) {
                    case 1:
                        irData[i] = irData[i] * (1000000 / frequency);
                        break;
                    case 2:
                        irData[i] = (int) Math.ceil(irData[i] * 26.27272727272727);
                        //converted as suggested by Samsung: http://developer.samsung.com/android/technical-docs/Workaround-to-solve-issues-with-the-ConsumerIrManager-in-Android-version-lower-than-4-4-3-KitKat
                        break;
                }
            }
        }
        return irData;

    }
}