// TD工具箱自定义协议解析。保持纯 Node 实现，便于单独测试。
const { URL } = require("url");

const SCHEME = "tdtoolbox";

function trim(value) {
  return String(value || "").trim();
}

function isHttpUrl(value) {
  try {
    const u = new URL(value);
    return u.protocol === "https:" || u.protocol === "http:";
  } catch {
    return false;
  }
}

function parseTdToolboxImport(rawUrl) {
  let url;
  try {
    url = new URL(String(rawUrl || ""));
  } catch {
    return { ok: false, error: "深链格式无效" };
  }
  if (url.protocol !== `${SCHEME}:`) return { ok: false, error: "深链协议无效" };
  if (url.host !== "v1" || url.pathname !== "/import") return { ok: false, error: "深链接口不存在" };

  const q = url.searchParams;
  const input = {
    resource: trim(q.get("resource")),
    app: trim(q.get("app")),
    name: trim(q.get("name")),
    endpoint: trim(q.get("endpoint")),
    apiKey: trim(q.get("apiKey")),
    model: trim(q.get("model")),
    source: trim(q.get("source")),
    sourceGroupId: trim(q.get("sourceGroupId")),
  };

  if (input.resource !== "provider") return { ok: false, error: "仅支持导入 provider 资源" };
  if (input.app !== "codex") return { ok: false, error: "仅支持 Codex 分组导入" };
  if (input.source !== "sub2api") return { ok: false, error: "仅支持 Sub2API 来源" };
  if (!input.name || input.name.length > 80) return { ok: false, error: "分组名称无效" };
  if (!isHttpUrl(input.endpoint)) return { ok: false, error: "API 地址必须是 http/https URL" };
  if (!input.apiKey || input.apiKey.length > 4096) return { ok: false, error: "API 密钥无效" };
  if (!input.model || input.model.length > 200) return { ok: false, error: "模型无效" };
  if (!/^[A-Za-z0-9_-]{1,128}$/.test(input.sourceGroupId)) return { ok: false, error: "来源分组 ID 无效" };

  input.name = input.name.replace(/[\r\n\0]/g, "");
  return { ok: true, input };
}

module.exports = { SCHEME, parseTdToolboxImport };