<?php declare(strict_types=1);

/*
 *     Copyleft (C) 2017  http://sikofitt.com sikofitt@gmail.com
 *
 *     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/>.
 */

namespace Sikofitt\SamsungTV\Actions;

use React\EventLoop\StreamSelectLoop;
use React\Stream\WritableResourceStream;
use Sikofitt\SamsungTV\Packet\PacketFactory;

/**
 * All available (supported (by me)) TV Keys.
 */
class Actions
{
    public const KEY_ENTER = 'KEY_ENTER';
    public const KEY_0 = 'KEY_0';
    public const KEY_1 = 'KEY_1';
    public const KEY_2 = 'KEY_2';
    public const KEY_3 = 'KEY_3';
    public const KEY_4 = 'KEY_4';
    public const KEY_5 = 'KEY_5';
    public const KEY_6 = 'KEY_6';
    public const KEY_7 = 'KEY_7';
    public const KEY_8 = 'KEY_8';
    public const KEY_9 = 'KEY_9';
    public const KEY_PLUS100 = 'KEY_PLUS100'; // - key

    public const KEY_HDMI = 'KEY_HDMI';   // Apparently not
    public const KEY_HDMI1 = 'KEY_HDMI1'; // the same
    public const KEY_HDMI2 = 'KEY_HDMI2';
    public const KEY_HDMI3 = 'KEY_HDMI3';
    public const KEY_HDMI4 = 'KEY_HDMI4';

    public const KEY_AV1 = 'KEY_AV1';
    public const KEY_AV2 = 'KEY_AV2';
    public const KEY_AV3 = 'KEY_AV3';

    public const KEY_TV = 'KEY_TV';
    public const KEY_POWEROFF = 'KEY_POWEROFF';
    
    public static $keyMap = [
      '9' => self::KEY_9,
      '8' => self::KEY_8,
      '7' => self::KEY_7,
      '6' => self::KEY_6,
      '5' => self::KEY_5,
      '4' => self::KEY_4,
      '3' => self::KEY_3,
      '2' => self::KEY_2,
      '1' => self::KEY_1,
      '0' => self::KEY_0,
      '-' => self::KEY_PLUS100,
      '.' => self::KEY_PLUS100,
      'E' => self::KEY_ENTER,
      'H' => self::KEY_HDMI,
      'H1' => self::KEY_HDMI1,
      'H2' => self::KEY_HDMI2,
      'H3' => self::KEY_HDMI3,
      'H4' => self::KEY_HDMI4,
      'T' => self::KEY_TV,
      'AV1' => self::KEY_AV1,
      'AV2' => self::KEY_AV2,
      'AV3' => self::KEY_AV3,
      'POWEROFF' => self::KEY_POWEROFF,
    ];

    /**
     * @var \Sikofitt\SamsungTV\Packet\PacketFactory
     */
    private $packetFactory;

    /**
     * @var string
     */
    private $address;

    public function __construct(string $tvAddress, int $port = 55000)
    {
        $this->packetFactory = new PacketFactory();
        $this->address = sprintf('%s:%d', $tvAddress, $port);
    }

    public function transformChannels(string $channel): \Generator
    {
        $codes = str_split($channel);

        foreach ($codes as $code) {
            yield $this->transformChannel($code);
        }
    }

    public function transformChannel(string $channel): string
    {
        if (array_key_exists(strtoupper($channel), self::$keyMap)) {
            return base64_encode(self::$keyMap[strtoupper($channel)]);
        }
        @trigger_error(sprintf('Channel "%s" is not yet supported.', $channel));

        return '';
    }

    public function sendKey(string $keyCode): void
    {
        $loop = new StreamSelectLoop();

        // Required for old TVs.  The computer presses the buttons too fast.
        $loop->nextTick(function (): void {
            usleep(140000);
        });

        $connection = stream_socket_client($this->address);

        $stream = new WritableResourceStream($connection, $loop);

        $stream->write($this->packetFactory->getStartPacket());

        $key = $this->transformChannel($keyCode);

        $stream->write($this->packetFactory->getKeyPacket($key));

        $loop->run();

        $stream->close();
    }

    /**
     * @param string $channel
     */
    public function changeChannel(string $channel): void
    {
        // Add enter at the end of the channel string.
        $channelArr = str_split($channel.'E');
        foreach ($channelArr as $item) {
            $this->sendKey($item);
        }
    }

    public function powerOff(): void
    {
        $this->sendKey('POWEROFF');
    }

    /**
     * @param string $input the source code in self::$keyMap
     */
    public function changeInput(string $input): void
    {
        switch (strtoupper($input)) {
            default:
            case 'TV':
                $this->sendKey('T');
                break;
            case 'HDMI':
                $this->sendKey('H');
                break;
            case 'HDMI1':
                $this->sendKey('H1');
                break;
            case 'HDMI2':
                $this->sendKey('H2');
                break;
            case 'HDMI3':
                $this->sendKey('H3');
                break;
            case 'HDMI4':
                $this->sendKey('H4');
                break;
            case 'AV1':
                $this->sendKey('AV1');
                break;
            case 'AV2':
                $this->sendKey('AV2');
                break;
            case 'AV3':
                $this->sendKey('AV3');
                break;
        }
    }
}