<?php
/*
|--------------------------------------------------------------------------
| core.php 微信平台核心类
|--------------------------------------------------------------------------
*/
namespace Main\Lib;

use Dever;

class Wechat
{
	/**
	 * config
	 *
	 * @var array
	 */
	private $config;

	/**
	 * config
	 *
	 * @var array
	 */
	private $token;
	
	/**
	 * project
	 *
	 * @var string
	 */
	private $project;
	
	/**
     * 构造函数　初始化
     * 
     * @return mixed
     */
	public function __construct($type = 'component', $project = false)
	{
		$this->config = Dever::config('sign')->cAll;
		
		if (!$project) {
			$project = Dever::input('project', 1);
		}

		if (!$project) {
			Dever::alert('project is not exits!');
		}

		$this->project = $project;
	}
	
	/**
     * 获取当前站点的配置
     * 
     * @return mixed
     */
	public function project()
	{
		return $this->project;
	}

	/**
     * 获取当前站点的配置
     * 
     * @return mixed
     */
	public function config()
	{
		return $this->config['accessToken'][$this->project];
	}
	
	/**
     * 获取签名信息
     * 
     * @return mixed
     */
	public function get($url)
	{
		$ticket = $this->ticket($this->token());
		
		if (!$ticket) {
			$return['status'] = 0;
			$return['msg'] 	= 'error';
		} else {
			$timestamp = time();
			$nonce = $this->nonce();
			$signature = $this->signature($ticket, $url, $timestamp, $nonce);
			$return = array
			(
				'appId'		=> $this->config['accessToken'][$this->project]['appid'],
				'timestamp'	=> $timestamp,
				'nonceStr'	=> $nonce,
				'signature'	=> $signature,
				'status'	=> 1,
				'msg'		=> '成功',
			);
		}
		
		Dever::out($return);
	}
	
	/**
     * 获取nonce
     * 
     * @return mixed
     */
	private function nonce()
	{
		return substr(md5(microtime()), rand(10, 15));
	}
	
    /**
     * 获取accessToken
     * 
     * @return mixed
     */
    public function token($state = 1)
    {
		$url = $this->config['accessToken']['url'] . '&' . http_build_query($this->config['accessToken'][$this->project]);
		
		$where['where_project'] = $this->project;
		$info = Dever::load('main/token-info', $where);

		$request = $update = false;
			
		if ($info && ((time() - $info['mdate'] >= $info['expires_in']) || $state == 2)) {
			$request = $update = true;
		} elseif ($info) {
			return $info['token'];
		}
		if (!$info) {
			$request = true;
			$update = false;
		}
		
		if ($request == true) {
			$data = json_decode(Dever::curl($url), true);
			
			if ($data && isset($data['access_token'])) {
				$data['expires_in'] = $data['expires_in'] - 2000;
				if ($update == true) {
					$set['set_project'] = $this->project;
					$set['set_token'] = $data['access_token'];
					$set['set_expires_in'] = $data['expires_in'];
					$set['where_id'] = $info['id'];
					Dever::load('main/token-update', $set);
				} else {
					$insert['add_project'] = $this->project;
					$insert['add_token'] = $data['access_token'];
					$insert['add_expires_in'] = $data['expires_in'];
					Dever::load('main/token-insert', $insert);
				}
				
				return $data['access_token'];
			}
		}
    }
    
    
    /**
     * 获取ticket
     * 
     * @return mixed
     */
    private function ticket($token)
    {
		$url = $this->config['ticket'] . $token;
		
		$where['where_project'] = $this->project;
		$info = Dever::load('main/ticket-info', $where);
		
		$request = $update = false;
			
		if ($info && time() - $info['mdate'] >= $info['expires_in']) {
			$request = $update = true;
		} elseif($info) {
			return $info['ticket'];
		}
		if (!$info) {
			$request = true;
			$update = false;
		}
		
		if ($request == true) {
			$data = json_decode(Dever::curl($url), true);
			
			if ($data && isset($data['ticket'])) {
				$data['expires_in'] = $data['expires_in'] - 2000;
				if ($update == true) {
					$set['set_project'] = $this->project;
					$set['set_ticket'] = $data['ticket'];
					$set['set_expires_in'] = $data['expires_in'];
					$set['where_name'] = $this->project;
					Dever::load('main/ticket-update', $set);
				} else {
					$insert['add_project'] = $this->project;
					$insert['add_ticket'] = $data['ticket'];
					$insert['add_expires_in'] = $data['expires_in'];
					Dever::load('main/ticket-insert', $insert);
				}
				
				return $data['ticket'];
			}
		}
    }
    
    
    /**
     * 获取signature
     * 
     * @return mixed
     */
    private function signature($ticket, $url, $timestamp, $noncestr)
    {
		$info = array();
		$info['jsapi_ticket'] = $ticket;
		$info['url'] = $url;
		$info['timestamp'] = $timestamp;
		$info['noncestr'] = $noncestr;
		ksort($info);

		$signature_string = substr(http_build_query($info), 0, -1);

		/*
		foreach($info as $k => $v)
		{
			$signature_string .= $k . '=' . $v . '&';
		}
		
		$signature_string = substr($signature_string, 0, -1);
		*/
		return sha1($signature_string);
	}
}