<?php namespace Api\Lib\Platform;
use Dever;
class Sign
{
    public function __construct($field, $config)
    {
        $this->field = $field;
        $this->config = $config;
        if (isset($this->config['sort']) && $this->config['sort'] == 3) {
            ksort($this->field->body);
        }
    }

    public function get()
    {
        if ($this->config['method'] == -1) {
            return false;
        }
        $this->create();
        if ($this->config['sort'] == 2) {
            ksort($this->info);
        }
        $this->split();
        $this->toString();
        $this->encrypt();
        $this->after();
        $this->field->setSign($this->info);
        return $this->info;
    }

    public function check($sign)
    {
        if ($this->config['method'] == -1) {
            return false;
        }
        if ($this->config['verify_type'] == 2 && $this->config['method'] > 0) {
            $this->create();
            if ($this->config['sort'] == 2) {
                ksort($this->info);
            }
            $this->split();
            $this->toString();
            $check = $this->field->ssl->decrypt($this->config['method'], $sign, $this->info);
        } else {
            $check = $sign == $this->get();
        }
        if (!$check) {
            Dever::error('签名验证失败');
        }
    }

    protected function create()
    {
        $this->info = array();
        if ($this->config['col']) {
            $col = explode('+', $this->config['col']);
            foreach ($col as $k => $v) {
                if ($v == 'body') {
                    $this->info = array_merge($this->field->body, $this->info);
                } else {
                    $k = $v;
                    if (strstr($v, '=')) {
                        $t = explode('=', $v);
                        $v = $t[1];
                        $k = $t[0];
                    }
                    $this->info[$k] = $this->field->value($v);
                }
            }
        } else {
            $this->info = $this->field->body;
        }
    }

    protected function split()
    {
        if (strstr($this->config['split'], '\\')) {
            $this->config['split'] = preg_replace_callback(
                '/\\\\([nrtf])/', // 匹配 \n, \r, \t, \f 等特殊字符
                function ($matches) {
                    $map = [
                        'n' => "\n",
                        'r' => "\r",
                        't' => "\t",
                        'f' => "\f"
                    ];
                    return $map[$matches[1]]; // 直接从映射中获取替换值
                },
                $this->config['split']
            );
        }
    }

    protected function toString()
    {
        $string = '';
        foreach ($this->info as $k => $v) {
            if ($this->config['empty'] == 2 && !$v) {
                continue;
            }
            if ($this->config['encode'] == 2 && strstr($v, 'http')) {
                $v = urlencode($v);
                if (isset($this->field->body[$k])) {
                    $this->field->body[$k] = $v;
                }
            }
            if ($this->config['type'] == 1) {
                $string .= $v;
            } elseif ($this->config['type'] == 2) {
                $string .= $k . '=' . $v;
            } elseif ($this->config['type'] == 3) {
                $string .= $k . $v;
            }
            
            $string .= "{$this->config['split']}";
        }
        if ($this->config['split_type'] == 1) {
            $this->info = rtrim($string, $this->config['split']);
        } else {
            $this->info = $string;
        }
    }

    protected function encrypt()
    {
        if ($this->config['method'] == -2) {
            $this->info = md5($this->info);
        } elseif ($this->config['method'] == -3) {
            $this->info = hash("sha256", $this->info);
        } elseif ($this->config['method'] == -4) {
            $this->info = sha1($this->info);
        } else {
            $this->info = $this->field->ssl->encrypt($this->config['method'], $this->info);
        }
    }

    protected function after()
    {
        if ($this->config['after'] == 2) {
            $this->info = strtoupper($this->info);
        } elseif ($this->config['after'] == 2) {
            $this->info = strtolower($this->info);
        }
    }
}