import { Hono } from "hono";
import type { Variables, WithAuth } from "./middlewares.ts";

import querystring from "node:querystring";
import crypto from "node:crypto";
import { Buffer } from "node:buffer";

function generateVodSignature(secret_id: string, secret_key: string) {
  // 确定 app 的云 API 密钥
  // var secret_id = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
  // var secret_key = "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA";

  // 确定签名的当前时间和失效时间
  const current = parseInt(((new Date()).getTime() / 1000).toString());
  const expired = current + 86400; // 签名有效期：1天

  // 向参数列表填入参数
  const arg_list = {
    secretId: secret_id,
    currentTimeStamp: current,
    expireTime: expired,
    random: Math.round(Math.random() * Math.pow(2, 32)),
  };

  // 计算签名
  const orignal = querystring.stringify(arg_list);
  const orignal_buffer = Buffer.from(orignal, "utf8");

  const hmac = crypto.createHmac("sha1", secret_key);
  const hmac_buffer = hmac.update(orignal_buffer).digest();

  const signature = Buffer.concat([hmac_buffer, orignal_buffer]).toString(
    "base64",
  );

  return signature;
}

export function createVodRoutes(withAuth: WithAuth) {
  const vodRoutes = new Hono<{ Variables: Variables }>();

  // VOD签名生成
  vodRoutes.get("/signature", withAuth, async (c) => {
    try {
      const secretId = Deno.env.get("VOD_SECRET_ID");
      const secretKey = Deno.env.get("VOD_SECRET_KEY");

      if (!secretId || !secretKey) {
        throw new Error("缺少VOD密钥配置");
      }

      const signature = generateVodSignature(secretId, secretKey);

      return c.json({
        signature,
      });
    } catch (error) {
      console.error("VOD签名生成错误:", error);
      return c.json({
        error: "签名生成失败",
      }, 500);
    }
  });

  return vodRoutes;
}