<?php


namespace App\Http\Controllers\Account;


use App\Cache\WechatStateCache;
use App\Libs\ApiResponse;
use App\Services\Account\AccountService;
use App\Services\Account\WechatService;
use Illuminate\Http\Request;
use Illuminate\Routing\Controller as BaseController;

class WechatController extends BaseController
{
    use ApiResponse;

    protected $wechatService;
    protected $accountService;

    public function __construct(
        WechatService $wechatService,
        AccountService $accountService
    ) {
        $this->wechatService  = $wechatService;
        $this->accountService = $accountService;
    }

    /**
     * 微信扫码登录入口：生成 state 后跳转到微信官方二维码页
     *
     * @return \Illuminate\Http\RedirectResponse
     */
    public function login()
    {
        $state = md5(uniqid((string)mt_rand(), true));
        WechatStateCache::set($state, (int)config('wechat.state_ttl', 600));

        return redirect()->away($this->wechatService->buildAuthUrl($state));
    }

    /**
     * 微信扫码回调：换取用户、注册/登录并带回 token
     *
     * @param Request $request
     * @return \Illuminate\Http\RedirectResponse
     */
    public function callback(Request $request)
    {
        $code     = trim((string)$request->get('code', ''));
        $state    = trim((string)$request->get('state', ''));
        $frontend = (string)config('wechat.web.frontend_redirect', '/');

        try {
            if ($state === '' || !WechatStateCache::pull($state)) {
                throw new \RuntimeException('登录已失效，请重新扫码');
            }
            if ($code === '') {
                throw new \RuntimeException('未获取到微信授权码');
            }

            list($uid, $isNew) = $this->wechatService->loginByCode($code);
            $tokenData         = $this->accountService->issueTokenForUser((int)$uid);

            return redirect()->away($this->appendQuery($frontend, [
                'd-token' => $tokenData['token'],
                'uid'     => (int)$uid,
                'is_new'  => $isNew ? 1 : 0,
            ]));
        } catch (\Throwable $e) {
            dLog('wechat')->info('wechat callback error', [$e->getMessage()]);

            return redirect()->away($this->appendQuery($frontend, [
                'wechat_error' => $e->getMessage(),
            ]));
        }
    }

    /**
     * 追加 query 参数
     *
     * @param string $url
     * @param array  $params
     * @return string
     */
    private function appendQuery(string $url, array $params): string
    {
        $separator = strpos($url, '?') === false ? '?' : '&';

        return $url . $separator . http_build_query($params);
    }
}