<?php
namespace App\Library\Protocol;

class ApiException extends \Exception {
    function __construct($code, $message = '')
    {
        if (empty($message)) {
            $message = ErrorCode::message($code);
            if ($message === null) {
                $message = $code;
                $code = 0;
            }
        }
        parent::__construct($message, $code);
    }
}

final class _Api {

    public $id;
    public $path;
    public $method;
    public $header;
    public $payload;
    public $response;
    public $desc;

    public function __construct($data) {
        $this->id = (int) $data['id'];
        $this->path = (string) $data['path'];
        $this->method = (string) strtolower($data['method']);
        if ($data['header'] == 'null') {
            $this->header = null;
        } else {
            $klass = sprintf("%s\\%s", __NAMESPACE__, $data['header']);
            $this->header = new $klass;
        }
        if ($data['payload'] == 'null') {
            $this->payload = null;
        } else {
            $klass = sprintf("%s\\%s", __NAMESPACE__, $data['payload']);
            $this->payload = new $klass;
        }
        if ($data['response'] == 'null') {
            $this->response = null;
        } else {
            $klass = sprintf("%s\\%s", __NAMESPACE__, $data['response']);
            $this->response = new $klass;
        }
        $this->desc = (string) $data['desc'];
    }

    public function setHeader($data) {
        if ($this->header === null) {
            throw new ApiException(ErrorCode::PROTO_TRY_TO_SET_VALUE_ON_NULL);
        }
        if (is_array($data) || $data instanceof $this->header) {
            return $this->header->set($data);
        }
        return false;
    }

    public function setPayload($data) {
        if ($this->payload === null) {
            return false;
        }
        if (is_array($data) || $data instanceof $this->payload) {
            return $this->payload->set($data);
        }
        return $this;
    }

    public function setResponse($data, $value = null) {
        if ($this->response === null) {
            throw new ApiException(ErrorCode::PROTO_TRY_TO_SET_VALUE_ON_NULL);
        }
        if (is_array($data) || $data instanceof $this->response) {
            $this->response->set($data);
        } elseif (is_string($data)) {
            $this->response->set([$data => $value]);
        }
        return $this;
    }

    public function parse() {
        return $this->response->iterate();
    }
}

final class Api {
	private static $api = [
		'/api/token/get' => [
			'payload' => 'token_req_info',
			'header' => 'app_info',
			'id' => '2',
			'path' => '/api/token/get',
			'method' => 'post',
			'response' => 'token_info',
			'desc' => '获取服务端token',
		],
		'/api/servers/list' => [
			'payload' => 'null',
			'header' => 'app_info',
			'id' => '1',
			'path' => '/api/servers/list',
			'method' => 'post',
			'response' => 'service_list',
			'desc' => '获取当前客户端可用服务端列表',
		],
		'/api/token/refresh' => [
			'payload' => 'token_info',
			'header' => 'app_info',
			'id' => '3',
			'path' => '/api/token/refresh',
			'method' => 'post',
			'response' => 'token_info',
			'desc' => '刷新服务端token',
		],
	];

	public static function get($path) {
		if (!isset(self::$api[$path])) {
			throw new ApiException(ErrorCode::PROTO_PATH_NOT_EXIST);
		}

		return new _Api(self::$api[$path]);
	}

}