<?php
class Lastfm {
    private $m_host = 'ws.audioscrobbler.com'; // The host domain to connect to
    private $m_port = 80; // The port to connect to
    private $m_socket; // The socket handler
    private $m_apiKey; // API key to make requests from Last.fm
    private $m_errorNumber; // Socket error number if error is encountered
    private $m_errorString; // Socket error message if error is encountered
    
    function Lastfm($key) {
        $this->m_apiKey = $key; // Set the API key
    
        // Open the socket and store handler
        $this->m_socket = fsockopen($this->m_host, $this->m_port, $this->m_errorNumber, $this->m_errorString);
        // If socket handler is false...
        if (!$this->m_socket) {
            echo "Connection failed";
        }
    }
    
    function send($message) {
        // Write (send) the message to the socket
        fwrite($this->m_socket, $message);
        
        // Start processing the response
        $response = '';
        $contentStarted = false; // Have we got to the response content yet?
        
        // While we still have more of the response to read...
        while (!feof($this->m_socket)) {
        
            // Get a line from the response
            $line = fgets($this->m_socket, 4096);
            // If line starts with { then we're at the content
            if (substr($line, 0, 1) === '{') $contentStarted = true;
            
            // If we're at the content...
            if ($contentStarted) {
                // Append line to the response
                $response .= $line;
            }
            
        }
        
        return $response;
    }
    
    function getRequest($method,$methodArgs) {
        // Create the URL
        $url = '/2.0/?';
        $url .= 'method='.rawurlencode(trim($method)).'&';
        $url .= 'api_key='.rawurlencode(trim($this->m_apiKey)).'&';
        foreach ($methodArgs as $name => $value) {
            $url .= rawurlencode(trim($name)) . '=' . rawurlencode(trim($value)) . '&';
        }
        $url .= 'format=json'; // We want the response content in JSON format
        
        // Form the HTTP GET header
        $out = "GET ".$url." HTTP/1.0\r\n";
        $out .= "Host: ".$this->m_host."\r\n";
        $out .= "\r\n";
        
        // Make the request and get the JSON response
        $json = $this->send($out);
        return json_decode($json, true);
    }
    
    function postRequest($method,$methodArgs) {
        // Create the URL
        $url = '/2.0/?';
        
        // Create the data
        $data = '';
        $data .= 'method='.rawurlencode(trim($method)).'&';
        $data .= 'api_key='.rawurlencode(trim($this->m_apiKey)).'&';
        foreach ($methodArgs as $name => $value) {
            $data .= rawurlencode(trim($name)) . '=' . rawurlencode(trim($value)) . '&';
        }
        $data .= 'format=json'; // We want the response content in JSON format
        
        // Form the HTTP POST header
        $out = "GET ".$url." HTTP/1.0\r\n";
        $out .= "Host: ".$this->m_host."\r\n";
        $out .= "Content-Length: ".strlen($data)."\r\n";
        $out .= "Content-Type: application/x-www-form-urlencoded\r\n";
        $out .= "\r\n";
        $out .= $data."\r\n";
        
        // Make the request and get the JSON response
        $json = $this->send($out);
        return json_decode($json, true);
    }
}