<?php

namespace Cli;

use Exception;
use Psr\Log\LoggerTrait;
use Qs_String;

class Logger implements LoggerInterface
{
    use LoggerTrait;

    protected $prefix;
    protected $handle;
    protected $verbose = false;

    public function setStream($handle)
    {
        if (!is_resource($handle) && null !== $handle) {
            throw new Exception('Invalid logger stream ' . var_dump($handle, true));
        }
        $this->handle = $handle;
        return $this;
    }

    public function hasStream()
    {
        return null !== $this->handle;
    }

    public function getStream()
    {
        if (null === $this->handle) {
            $this->handle = fopen('php://output', 'w+');
        }
        return $this->handle;
    }

    public function isVerbose()
    {
        return $this->verbose;
    }

    public function setVerbose($verbose)
    {
        $this->verbose = $verbose;
        return $this;
    }

    public function getPrefix()
    {
        return $this->prefix;
    }

    public function setPrefix($prefix)
    {
        $this->prefix = $prefix;
        return $this;
    }

    public function log($level, $message, array $context = array())
    {
        $indent = "\t";
        $text = date('Y-m-d H:i:s')
            . $indent . strtoupper($level)
            . $indent . $this->getPrefix() . Qs_String::fill($message, $context)
            . PHP_EOL;
        fwrite($this->getStream(), $text);
        return $this;
    }

    public function removeOldLogs($dir, $limit)
    {
        $files = glob($dir . '/*');
        sort($files);
        if (count($files) > $limit) {
            $removeFiles = array_slice($files, 0, count($files) - $limit);
            foreach ($removeFiles as $file) {
                unlink($file);
            }
        }
        return $this;
    }
}