<?php
# solution to Address Book JSON section problem

header("Content-type: application/json");
$file_text = "";
if (file_exists("addresses.txt")) {
	$file_text = file_get_contents("addresses.txt");
}

if ($_SERVER["REQUEST_METHOD"] == "GET") {
	$lines = explode("\n", $file_text);
	if (isset($_GET["name"])) {
		# user passed a name; wants the address of that person as JSON
		$name = $_GET["name"];
		$address = "";
		
		foreach ($lines as $line) {
			list($line_name, $line_address) = explode(",", $line);
			if ($line_name == $name) {
				$address = $line_address;
				break;
			}
		}

		if ($address) {
			$json = array(
				"name" => $name,
				"address" => $address,
			);
			print json_encode($json);
		}
	} else {
		# no name passed; build an array of all names and output it as JSON
		$names = array();
		foreach ($lines as $line) {
			list($line_name, $line_address) = explode(",", $line);
			array_push($names, $line_name);
		}
		
		$json = array(
			"names" => $names,
		);
		print json_encode($json);
	}
} else {
	# a POST request; add the given name/address to our data file
	$name = $_POST["name"];
	$address = $_POST["address"];
	$file_text = file_get_contents("addresses.txt");
	$file_text .= "\n" . $name . "," . $address;
	file_put_contents("addresses.txt", $file_text);
}
?>