<?php

	echo "getProgramInformation got called" ."\n";
	
	// serial setup
	// Include the PHP serial class
	include "php_serial.class.php";

	// Start a new serial class
	$serial = new phpSerial;
	// Specify the device being used
	$serial->deviceSet("/dev/ttyACM0");
	// Set baud rate
	$serial->confBaudRate(9600);
	$serial->confParity("none");
	$serial->confCharacterLength(8);
	$serial->confStopBits(1);
	$serial->confFlowControl("none");
	// Open the device
	$serial->deviceOpen();	
	
	while(1){
		
		$topics = array("recycle","plastic","ewaste", "environment","planet","global%20warming","prakriti", "risaikuru", "corruption", "earth");
		$max = count($topics)-1;
		$index =  rand(0 , $max );
		$url = "http://data.tweetsentiments.com:8080/api/search.json?topic=".$topics[$index];
		
		$curl = curl_init();
		curl_setopt($curl, CURLOPT_URL, $url );
		curl_setopt( $curl, CURLOPT_RETURNTRANSFER, 1 );
		$result = curl_exec( $curl );
		curl_close($curl);
		$result = utf8_encode($result);
		//var_dump($result);
		$data = json_decode($result, true);
		echo "tweets for ".$topics[$index];	
		
		// hat tip - http://www.bushveldlab.com/Bushveld_Labs/Blog/Entries/2011/3/13_Controlling_Arduino_with_PHP_in_Ubuntu.html 
		// Nonzero number to be sent to Arduino
		$sentiment_index = intval($data["sentiment_index"]);
		$negative = intval($data["negative"]);
		$positive = intval($data["positive"]);
		$neutral =  intval($data["neutral"]);

		echo $sentiment_index ."\n";
		echo $positive."\n";
		echo $negative."\n";
		echo $neutral."\n";


		$serial->sendMessage('s');
		$serial->sendMessage(chr($sentiment_index));
		$serial->sendMessage('p');
		$serial->sendMessage(chr($positive));
		$serial->sendMessage('g');
		$serial->sendMessage(chr($negative));
		$serial->sendMessage('n'); 
		$serial->sendMessage(chr($neutral));
		
		sleep(1800);
}
	
	// Close the port
	$serial->deviceClose();

?>