<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2015 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace think;

class Debug
{

    protected static $info = [];
    protected static $mem  = [];

    /**
     * 操作句柄
     * @var object
     * @access protected
     */
    protected static $handler = null;

    /**
     * 初始化调试驱动
     * @access public
     * @param array $options  配置数组
     * @return object
     */
    public static function init($options = [])
    {
        $type          = !empty($options['type']) ? $options['type'] : 'Local';
        $class         = 'think\\debug\\driver\\' . ucwords($type);
        self::$handler = new $class($options);
        return self::$handler;
    }

    /**
     * 记录时间（微秒）和内存使用情况
     * @param string $name 标记位置
     * @param mixed $value 标记值 留空则取当前 time 表示仅记录时间 否则同时记录时间和内存
     * @return mixed
     */
    public static function remark($name, $value = '')
    {
        // 记录时间和内存使用
        self::$info[$name] = is_float($value) ? $value : microtime(true);
        if ('time' != $value) {
            self::$mem['mem'][$name]  = is_float($value) ? $value : memory_get_usage();
            self::$mem['peak'][$name] = memory_get_peak_usage();
        }
    }

    /**
     * 统计某个区间的时间（微秒）使用情况
     * @param string $start 开始标签
     * @param string $end 结束标签
     * @param integer|string $dec 小数位
     * @return mixed
     */
    public static function getUseTime($start, $end, $dec = 6)
    {
        if (!isset(self::$info[$end])) {
            self::$info[$end] = microtime(true);
        }
        return number_format((self::$info[$end] - self::$info[$start]), $dec);
    }

    /**
     * 记录内存使用情况
     * @param string $start 开始标签
     * @param string $end 结束标签
     * @param integer|string $dec 小数位
     * @return mixed
     */
    public static function getUseMem($start, $end, $dec = 2)
    {
        if (!isset(self::$mem['mem'][$end])) {
            self::$mem['mem'][$end] = memory_get_usage();
        }
        $size = self::$mem['mem'][$end] - self::$mem['mem'][$start];
        $a    = ['B', 'KB', 'MB', 'GB', 'TB'];
        $pos  = 0;
        while ($size >= 1024) {
            $size /= 1024;
            $pos++;
        }
        return round($size, $dec) . " " . $a[$pos];
    }

    /**
     * 统计内存峰值情况
     * @param string $start 开始标签
     * @param string $end 结束标签
     * @param integer|string $dec 小数位
     * @return mixed
     */
    public static function getMemPeak($start, $end, $dec = 2)
    {
        if (!isset(self::$mem['peak'][$end])) {
            self::$mem['peak'][$end] = memory_get_peak_usage();
        }
        $size = self::$mem['peak'][$end] - self::$mem['peak'][$start];
        $a    = ['B', 'KB', 'MB', 'GB', 'TB'];
        $pos  = 0;
        while ($size >= 1024) {
            $size /= 1024;
            $pos++;
        }
        return round($size, $dec) . " " . $a[$pos];
    }

    /**
     * 浏览器友好的变量输出
     * @param mixed $var 变量
     * @param boolean $echo 是否输出 默认为true 如果为false 则返回输出字符串
     * @param string $label 标签 默认为空
     * @return void|string
     */
    public static function dump($var, $echo = true, $label = null)
    {
        $label = (null === $label) ? '' : rtrim($label) . ':';
        ob_start();
        var_dump($var);
        $output = ob_get_clean();
        $output = preg_replace('/\]\=\>\n(\s+)/m', '] => ', $output);
        if (IS_CLI) {
            $output = PHP_EOL . $label . $output . PHP_EOL;
        } else {
            if (!extension_loaded('xdebug')) {
                $output = htmlspecialchars($output, ENT_QUOTES);
            }
            $output = '<pre>' . $label . $output . '</pre>';
        }
        if ($echo) {
            echo ($output);
            return null;
        } else {
            return $output;
        }
    }

    // 静态调用
    public static function __callStatic($method, $params)
    {
        return call_user_func_array([self::$handler, $method], $params);
    }
}