const express = require('express');
const crypto = require('crypto');
const axios = require('axios');
const bodyParser = require('body-parser');
const path = require('path');

const app = express();
const port = 3000;

// AES CBC 加密函数，返回 Base64
function aesEncrypt(plainText, key) {
    const keyBuffer = Buffer.from(key, 'hex');  // 将16进制的密钥转换为 Buffer
    const blockSize = 16; // AES 块大小
    const iv = crypto.randomBytes(blockSize);  // 生成随机 IV
    const cipher = crypto.createCipheriv('aes-128-cbc', keyBuffer, iv);
    cipher.setAutoPadding(true);
    let encrypted = cipher.update(plainText);
    encrypted = Buffer.concat([iv, encrypted, cipher.final()]);
    return encrypted.toString('base64');
}

// AES CBC 解密函数，返回解密后的明文
function aesDecrypt(encryptedText, key) {
    const encryptedBuffer = Buffer.from(encryptedText, 'base64');
    const keyBuffer = Buffer.from(key, 'hex');
    const blockSize = 16;
    const iv = encryptedBuffer.slice(0, blockSize);
    const encryptedData = encryptedBuffer.slice(blockSize);
    const decipher = crypto.createDecipheriv('aes-128-cbc', keyBuffer, iv);
    decipher.setAutoPadding(true);
    let decrypted = decipher.update(encryptedData);
    decrypted = Buffer.concat([decrypted, decipher.final()]);
    return decrypted.toString();
}

// 模拟请求参数
const mockData = {
    "FLXG3D56": {
        mobile_no: "18276151590",
        id_card: "45212220000827423X",
        name: "张荣宏",
        time_range: "5",
        description: "特殊名单验证"
    },
    "FLXG54F5": {
        mobile_no: "13812345678",
        description: "易诉人群识别"
    },
    "FLXG162A": {
        mobile_no: "13812345678",
        id_card: "110101199003076534",
        name: "张三",
        description: "团伙欺诈排查（通用版）"
    },
    "FLXG970F": {
        id_card: "110101199003076534",
        name: "李四",
        description: "风险人员核验"
    },
    "FLXG5876": {
        mobile_no: "13812345678",
        description: "易诉人"
    },
    "FLXG9687": {
        mobile_no: "13812345678",
        id_card: "110101199003076534",
        name: "王五",
        description: "电诈风险预警-标准版"
    },
    "FLXGC9D1": {
        mobile_no: "13812345678",
        id_card: "110101199003076534",
        name: "赵六",
        description: "黑灰产等级"
    },
    "FLXGCA3D": {
        id_card: "110101199003076534",
        name: "李四",
        description: "个人综合涉诉"
    },
    "FLXGDEC7": {
        id_card: "110101199003076534",
        name: "张三",
        description: "个人不良"
    },
    "IVYZ385E": {
        id_card: "110101199003076534",
        name: "张三",
        description: "自然人生存状态标识"
    },
    "IVYZ5733": {
        name: "李四",
        id_card: "110101199003076534",
        description: "单人婚姻登记信息核验"
    },
    "IVYZ9363": {
        man_name: "张三",
        man_id_card: "110101199003076534",
        woman_name: "王五",
        woman_id_card: "110101199003076535",
        description: "双人婚姻状态识别"
    },
    "JRZQ0A03": {
        mobile_no: "13812345678",
        id_card: "110101199003076534",
        name: "张三",
        description: "借贷意向验证"
    },
    "JRZQ4AA8": {
        mobile_no: "13812345678",
        id_card: "110101199003076534",
        name: "王五",
        description: "偿债压力指数"
    },
    "JRZQ8203": {
        mobile_no: "13812345678",
        id_card: "110101199003076534",
        name: "赵六",
        description: "借贷行为验证"
    },
    "JRZQDCBE": {
        mobile_no: "13812345678",
        id_card: "110101199003076534",
        bank_card: "6212261901001234567",
        name: "张三",
        description: "银行卡四要素验证"
    },
    "QYGL2ACD": {
        ent_name: "某企业",
        legal_person: "李四",
        ent_code: "91310000123456789X",
        description: "企业三要素核验"
    },
    "QYGL6F2D": {
        id_card: "110101199003076534",
        description: "人企关联"
    },
    "QYGL45BD": {
        ent_name: "某公司",
        legal_person: "王五",
        ent_code: "91310000123456789X",
        id_card: "110101199003076534",
        description: "企业法人四要素核验"
    },
    "QYGL8261": {
        ent_name: "某公司",
        description: "企业综合涉诉"
    },
    "QYGLB4C0": {
        id_card: "110101199003076534",
        description: "股东人企关系精准版"
    },
    "YYSY4B37": {
        mobile_no: "13812345678",
        description: "手机在网时长"
    },
    "YYSY4B21": {
        mobile_no: "13812345678",
        description: "手机在网状态"
    },
    "YYSY6F2E": {
        mobile_no: "13812345678",
        mobile_type: "CMCC",
        id_card: "110101199003076534",
        name: "张三",
        description: "运营商三要素核验（详版）"
    },
    "YYSY09CD": {
        mobile_no: "13812345678",
        mobile_type: "CUCC",
        id_card: "110101199003076534",
        name: "李四",
        description: "运营商三要素验证（简版）"
    },
    "YYSYBE08": {
        mobile_no: "13812345678",
        name: "张三",
        description: "运营商二要素核验（手机号、姓名）"
    },
    "YYSYD50F": {
        mobile_no: "13812345678",
        id_card: "110101199003076534",
        description: "运营商二要素核验（手机号、身份证）"
    },
    "YYSYF7DB": {
        mobile_no: "13812345678",
        start_date: "20220101",
        description: "手机二次卡"
    }
};
// 使用 EJS 模板引擎
app.set('view engine', 'ejs');
app.set('views', path.join(__dirname, 'views'));

// 解析POST请求的数据
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

// 提供静态文件（比如 CSS）
app.use(express.static(path.join(__dirname, 'public')));

// 提供前端页面
app.get('/', (req, res) => {
    res.render('index', { interfaces: Object.keys(mockData), mockData: mockData });
});

// 处理 API 请求
app.post('/request-api', async (req, res) => {
    const { interfaceName, params } = req.body;

    const url = `http://api.tianyuanapi.com/api/v1/${interfaceName}`;
    // const url = `http://127.0.0.1:10003/api/v1/${interfaceName}`;

    const accessId = 'aa16cc6e9da90461';
    const key = 'ff83609b2b24fc73196aac3d3dfb874f'; // AES 16进制密钥

    const data = JSON.parse(params); // 使用用户自定义的参数
    const jsonStr = JSON.stringify(data);
    const encryptedData = aesEncrypt(jsonStr, key);

    try {
        const response = await axios.post(url, { data: encryptedData }, {
            headers: {
                'Access-Id': accessId,
                'Content-Type': 'application/json'
            }
        });
        console.log("response.data", response.data)


        const { code, message, data: encryptedResponseData } = response.data;

        let decryptedData = null;

        // 如果有返回data，无论code是否为0，都尝试解密
        if (encryptedResponseData) {
            try {
                decryptedData = aesDecrypt(encryptedResponseData, key);
                decryptedData = JSON.parse(decryptedData); // 解密后的数据解析为对象
            } catch (decryptError) {
                // 解密失败时返回null
                decryptedData = null;
            }
        }

        // 返回响应，无论code是否为0，统一返回加密和解密数据
        res.json({
            code,
            success: code === 0,
            message,
            encryptedResponse: encryptedResponseData || null,
            decryptedResponse: decryptedData
        });
    } catch (error) {
        res.json({ success: false, message: '请求失败', error: error.message });
    }

});

app.listen(port, () => {
    console.log(`Server running at http://localhost:${port}`);
});