<?php

/*
 * Copyright (C) 2014, NoccyLabs
 * 
 * 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 NoccyLabs\Gpio\Device;
use NoccyLabs\Gpio\GpioPin;

abstract class Device
{

    protected $name;

    protected $description;

    protected $pins = array();

    public function __construct()
    {
        $this->configure();
    }

    protected function configure()
    {
        // call on ->addGpioPin etc here
    }
    
    public function setGpio(Gpio $gpio=null)
    {
        $this->gpio = $gpio;
    }
    
    public function getGpio()
    {
        return $this->gpio;
    }
    
    public function setName($name)
    {
        $this->name = $name;
        return $this;
    }
    
    public function getName()
    {
        return $this->name;
    }
    
    public function setDescription($description)
    {
        $this->description = $description;
        return $this;
    }
    
    public function getDescription()
    {
        return $this->description;
    }
    
    public function addPin($name, $description=null)
    {
        $this->pins[$name] = null;
        return $this;
    }

    /**
     * Get all allocated pins
     *
     */
    public function getPins()
    {
        return $this->pins;
    }
    
    /**
     * Get a pin by the name specified when allocating it
     *
     */
    public function getPin($name)
    {
        return $this->pins[$name];
    }
    
    public function setPin($pin_name, $pin)
    {
        if (array_key_exists($pin_name, $this->pins)) {
            $pin->setLabel($this->name.".".$pin_name);
            $this->pins[$pin_name] = $pin;
            return $this;
        }
        throw new \Exception();
    }

    /**
     * Get a pin as a property from its name
     *
     */
    public function __get($pin_name)
    {
        return $this->getPin($pin_name);
    }
    
    public function __set($pin_name, GpioPin $pin)
    {
        $this->setPin($pin_name, $pin);
    }
    
    protected function delayMillis($ms)
    {
        usleep($ms*1000);
    }
    
    protected function delayMicros($us)
    {
        usleep($us);
    }
    
    protected function shiftOut(GpioPin $pdata, GpioPin $pclk, $byte)
    {
        for ($bit = 0; $bit < 8; $bit++) {
            $bval = 1<<$bit;
            $pclk->setValue(0);
            $pdata->setValue(($byte & $bval) == $bval);
            $pclk->setValue(1);
        }
    }

}