<?php

namespace Stemcell\Customer\Helper\Deepblue;

use Magento\Framework\App\Helper\Context;
use Magento\Framework\Exception\LocalizedException;

class Token extends \Magento\Framework\App\Helper\AbstractHelper
{
    const DEEPBLUE_TOKEN_IDENTIFIER = 'DEEPBLUE-TOKEN-IDENTIFIER-';
    protected \Magento\Framework\HTTP\Client\Curl $curl;

    protected Caller $caller;

    private int $timestamp = 0;
    private \Magento\Framework\App\CacheInterface $cache;

    public function __construct(
        Context $context,
        \Magento\Framework\HTTP\Client\Curl $curl,
        \Magento\Framework\App\CacheInterface $cache
    ) {
        parent::__construct($context);
        $this->curl = $curl;
        $this->cache = $cache;
    }

    public function setCaller(Caller $caller): static
    {
        $this->caller = $caller;
        return $this;
    }

    protected function getTimestamp(): int
    {
        if (!$this->timestamp) {
            return $this->timestamp = round(microtime(true) * 1000);
        }

        return $this->timestamp;
    }

    protected function sign(): string
    {
        return md5(
            $this->caller->getAppKey() . $this->getTimestamp() . $this->caller->getAppSecret()
        );
    }

    protected function getRequestData(): array
    {
        return [
            'sign' => $this->sign(),
            'appKey' => $this->caller->getAppKey(),
            'timestamp' => $this->getTimestamp(),
        ];
    }

    protected function getRequestUrl(): string
    {
        return rtrim($this->caller->getHost(), "/") . '/api/auth/thirdPartyToken';
    }

    protected function post(): array
    {
        $body = json_encode($this->getRequestData());

        $this->curl->addHeader("Content-Type", "application/json");
        $this->curl->post( $this->getRequestUrl(), $body);

        $body = json_decode($this->curl->getBody(), true);

        return $body;
    }

    /**
     * @return string
     * @throws LocalizedException
     */
    protected function tokenCache(): string
    {
        $lifeTime = 24*3600-60;
        $token = $this->post();
        if (isset($token['code']) && $token['code'] == 200) {
            $cacheData = json_encode([
                'token' => $token['data'],
                'created_at' => time()
            ]);

            $this->cache->save($cacheData, self::DEEPBLUE_TOKEN_IDENTIFIER, [], $lifeTime);
            return $token['data'];
        }

        throw new LocalizedException(__('从/api/auth/thirdPartyToken获取token失败，原因：'.$token['msg'].', code:'.$token['code']));
    }

    /**
     * @return string
     * @throws LocalizedException
     */
    public function getToken(): string
    {
        $token = $this->cache->load(self::DEEPBLUE_TOKEN_IDENTIFIER);
        if (!$token) {
            return $this->tokenCache();
        }

        $cacheData = json_decode($token, true);
        if ((time() - $cacheData['created_at']) > 60) {
            return $this->tokenCache();
        }

        return $cacheData['token'];
    }
}