<?php

namespace app\admin\controller\wxapp;

use app\common\controller\Backend;
use think\Cache;

/**
 * 微信小程序消息推送配置管理
 */
class MessagePush extends Backend
{
    protected $model = null;

    public function _initialize()
    {
        parent::_initialize();
        \app\common\model\fill\Handle::check('config_system', 'wxMiniProgram');
        \app\common\model\fill\Handle::check('config_system', 'wxMiniProgramMsgPush');
    }

    /**
     * 获取消息推送配置
     * @return mixed
     */
    public function getConfig()
    {
        $wxConfig = \app\common\model\config\System::getConfig('wxMiniProgram') ?: [];
        $msgPushConfig = \app\common\model\config\System::getConfig('wxMiniProgramMsgPush') ?: [];

        $msgPushToken = isset($msgPushConfig['msg_push_token']) ? $msgPushConfig['msg_push_token'] : '';
        $msgPushAesKey = isset($msgPushConfig['msg_push_aes_key']) ? $msgPushConfig['msg_push_aes_key'] : '';

        if (empty($msgPushToken)) {
            $msgPushToken = $this->generateRandomString(32);
            $this->saveConfigField('msg_push_token', $msgPushToken);
        }

        if (empty($msgPushAesKey)) {
            $msgPushAesKey = $this->generateRandomString(43);
            $this->saveConfigField('msg_push_aes_key', $msgPushAesKey);
        }

        $data = [
            'msg_push_url' => $this->getMsgPushUrl(),
            'msg_push_token' => $msgPushToken,
            'msg_push_aes_key' => $msgPushAesKey,
        ];

        return $this->success("获取成功", $data);
    }

    /**
     * 修复配置（用默认结构重建，保留已有字段的值）
     * 当数据库中的配置字段损坏时使用
     * @return mixed
     */
    public function repairConfig()
    {
        $configName = 'wxMiniProgramMsgPush';
        $default = \app\common\model\fill\Handle::getSystemDefaultConfig($configName);
        if (!$default) {
            return $this->error('默认配置不存在');
        }

        $model = new \app\admin\model\config\System();
        $dbRow = $model->where(['name' => $configName])->find();
        if (!$dbRow) {
            return $this->error('配置记录不存在');
        }

        $existConfig = json_decode($dbRow->value, true) ?: [];
        $existValues = [];
        foreach ($existConfig as $item) {
            if (isset($item['name']) && isset($item['value'])) {
                $existValues[$item['name']] = $item['value'];
            }
        }

        foreach ($default as &$item) {
            if (isset($existValues[$item['name']])) {
                $item['value'] = $existValues[$item['name']];
            }
        }

        $dbRow->value = json_encode(array_values($default), JSON_UNESCAPED_UNICODE);
        $dbRow->save();
        Cache::rm(\app\common\constant\cache\Keys::SYSTEM_CONFIG($configName));

        return $this->success('修复成功');
    }

    /**
     * 获取消息推送回调地址
     * @return string
     */
    private function getMsgPushUrl()
    {
        global $_W;
        if (\app\common\library\Platform::getSystemType() == 'single') {
            return $_W['siteroot'] . '/index.php?i=' . $_W['uniacid'] . '&route=callback/app.wxapp/notify';
        } else {
            return $_W['siteroot'] . '/app/index.php?i=' . $_W['uniacid'] . '&c=entry&m=tuzi_v1&do=index&route=callback/app.wxapp/notify';
        }
    }

    /**
     * 刷新Token
     * @return mixed
     */
    public function refreshToken()
    {
        $token = $this->generateRandomString(32);
        $this->saveConfigField('msg_push_token', $token);
        return $this->success("刷新成功", ['msg_push_token' => $token]);
    }

    /**
     * 刷新EncodingAESKey
     * @return mixed
     */
    public function refreshAESKey()
    {
        $aesKey = $this->generateRandomString(43);
        $this->saveConfigField('msg_push_aes_key', $aesKey);
        return $this->success("刷新成功", ['msg_push_aes_key' => $aesKey]);
    }

    /**
     * 保存配置字段值
     * @param string $fieldName 字段名
     * @param string $value 值
     */
    private function saveConfigField($fieldName, $value)
    {
        $configName = 'wxMiniProgramMsgPush';
        $config = \app\common\model\config\System::load($configName);
        if (!$config) {
            $this->error("配置不存在");
        }

        $found = false;
        foreach ($config as &$item) {
            if (isset($item['name']) && $item['name'] === $fieldName) {
                $item['value'] = $value;
                $found = true;
                break;
            }
        }

        if (!$found) {
            $this->error("字段不存在");
        }

        $model = new \app\admin\model\config\System();
        $row = $model->where(['name' => $configName])->find();
        if ($row) {
            $row->value = json_encode(array_values($config), JSON_UNESCAPED_UNICODE);
            $row->save();
            Cache::rm(\app\common\constant\cache\Keys::SYSTEM_CONFIG($configName));
        }
    }

    /**
     * 生成随机字符串
     * @param int $length 长度
     * @return string
     */
    private function generateRandomString($length)
    {
        $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
        $result = '';
        for ($i = 0; $i < $length; $i++) {
            $result .= $chars[random_int(0, strlen($chars) - 1)];
        }
        return $result;
    }
}