<?php
namespace app\common;

/**
 * 配置文件读写类
 * @access private 常驻内存运行，禁止执行器调用
 */
class Config
{
    /**
     * 扩展名映射表
     */
    const extMap = [
        'array' => '.php',
        'json'  => '.json',
        'object'=> '.data',
    ];

    /**
     * 写入配置
     * @param string $filename  文件名
     * @param mixed $data       数据
     * @param string $type      数据类型
     * @param bool $absolutePath 绝对路径
     * @return bool|int
     */
    public static function set(string $filename, $data, string $type = 'array', bool $absolutePath = false)
    {
        if (empty($filename)) {
            return false;
        }

        clearstatcache();
        if ($absolutePath) {
            $dir = dirname($filename);
            is_dir($dir) or mkdir($dir, 0777, true);
        }
        
        $file_name = $absolutePath ? $filename : static::createFilePath($filename, $type);
        if (file_exists($file_name)) {
            chmod($file_name, 0777);
        }
        switch (strtolower($type)) {
            case 'object':
                $str = serialize($data);
                break;
            case 'json':
                $str = json_encode($data, JSON_UNESCAPED_UNICODE);
                break;
            case 'array':
                $str = '<?php'.PHP_EOL.'return ' . var_export($data, true) . ';'.PHP_EOL;
                break;
            default:
                $str = $data;
                break;
        }

        $writeLen = file_put_contents($file_name, $str);
        return $writeLen === 0 ? false : $writeLen;
    }

    /**
     * 读取配置
     * @param string $filename   文件名
     * @param string $type       数据类型
     * @param null $default      默认值
     * @param bool $absolutePath 绝对路径
     * @return false|string|null|array
     */
    public static function get(string $filename, string $type = 'array', $default = null, bool $absolutePath = false)
    {
        if (empty($filename)) {
            return $default;
        }

        $file_name = $absolutePath ? $filename : static::createFilePath($filename, $type);
        clearstatcache();
        if (is_file($file_name)) {
            switch (strtolower($type)) {
                case 'object':
                    $d = @unserialize(file_get_contents($file_name, false, null));
                    break;
                case 'json':
                    $d = json_decode(file_get_contents($file_name, false, null), JSON_UNESCAPED_UNICODE);
                    break;
                case 'array':
                    $d = include $file_name;
                    break;
                default:
                    $d = file_get_contents($file_name, false, null);
                    break;
            }
            return $d;
        }

        return $default;
    }

    /**
     * 删除配置
     * @param string $name
     * @param bool $absolutePath
     * @return bool
     */
    public static function delete(string $name, bool $absolutePath = false)
    {
        if ($name === null || $name === '') {
            return false;
        }
        $file_name = $absolutePath ? $name : db_path() . DIRECTORY_SEPARATOR . $name;
        clearstatcache();
        if (is_file($file_name)) {
            return @unlink($file_name);
        }
        return true;
    }

    /**
     * 创建文件路径
     * @param string $name
     * @param string $type
     * @return string
     */
    public static function createFilePath(string $name = '', string $type = 'array'):string
    {
        $ext = isset(self::extMap[$type]) ? self::extMap[$type] : self::extMap['object'];
        return db_path() . DIRECTORY_SEPARATOR . $name . $ext;
    }
}