<?php

namespace NoccyLabs\Lpr;

class PrintJob
{
    /** @var string The print server to use (-H) */
    protected $server;
    /** @var string The name of the print job (-T) */
    protected $jobName;
    /** @var string Document filename */
    protected $document;
    /** @var string The printer to use as destination[/instance] (-P) */
    protected $printer;
    /** @var array The job options (-o) */
    protected $options = [];
    /** @var bool If true, encryption is forced when communicating with server (-E) */
    protected $forceEncryption = false;
    /** @var bool If true, the named print files will be deleted by lpr after print (-r) */
    protected $deleteAfterPrint = false;

    /**
     * Constructor; creates a new print job.
     * 
     * 
     */
    public function __construct($document, $printer=null, $server=null)
    {
        $this->document = $document;
        $this->printer = $printer;
        $this->server = $server;
    }

    /**
     * 
     * 
     * @return PrintJob
     */
    public function setPrinter($printer)
    {
        $this->printer = $printer;
        return $this;
    }

    /**
     * 
     * 
     * @return PrintJob
     */
    public function setMedia($media)
    {
        $this->media = $media;
        return $this;
    }

    /**
     * 
     * 
     * @param string $name The print job name to use
     * @return PrintJob
     */
    public function setJobName($name)
    {
        $this->jobName = $name;
        return $this;
    }

    /**
     * 
     * 
     * @return PrintJob
     */
    public function setServer($server, $port)
    {
        $this->server = $server . (!!$port?":{$port}":"");
        return $this;
    }

    /**
     * 
     * 
     * @return PrintJob
     */
    public function setOption($option, $value)
    {
        $this->options[$option] = $value;
        return $this;
    }

    /**
     * Attempt to submit the job using the lpr command.
     * 
     * 
     */
    public function submit()
    {
        $options = [];
        if ($this->server !== null) {
            $options[] = "-H";
            $options[] = $this->server;
        }
        if ($this->printer !== null) {
            $options[] = "-P";
            $options[] = $this->printer;
        }
        if ($this->jobName !== null) {
            $options[] = "-T";
            $options[] = $this->jobName;
        }
        foreach ($this->options as $option=>$value) {
            $options[] = "-o";
            if ($value === true) {
                $options[] = $option;
            } else {
                $options[] = $option."=".$value;
            }
        }

        $optionString = join(" ", array_map("escapeshellarg", $options));
        $cmdLine = sprintf("lpr %s %s", $optionString, escapeshellarg($this->document));

        $ds = [
            1 => [ 'pipe', 'w' ],
            2 => [ 'pipe', 'w' ]
        ];
        $proc = proc_open($cmdLine, $ds, $pipes);

        do {
            usleep(10000);
            $status = proc_get_status($proc);
        } while ($status['running']);
        
        if ($status['exitcode'] > 0) {
            $stderr = stream_get_contents($pipes[2]);            
            throw new LprException(
                sprintf("lpr exited with code %d: %s", $status['exitcode'], $stderr)
            );
        }

        proc_close($proc);

    }

}