/**
 * HTTP / GraphQL 响应面板：Pretty / Raw / 响应头 + 状态条。
 */
import { useMemo } from "react";
import { useWorkspace } from "../../workspaceStore";
import { CopyButton, JsonView, cx, formatBytes } from "../common";
import { ProxyErrorBanner } from "../ProxyErrorBanner";

export function ResponsePanel({ nodeId }: { nodeId: string }) {
  const runtime = useWorkspace((s) => s.runtime[nodeId]);
  const setRuntime = useWorkspace((s) => s.setRuntime);
  const tab = runtime?.responseTab ?? "body";
  const result = runtime?.result ?? null;
  const error = runtime?.error ?? null;
  const loading = runtime?.loading ?? false;

  const contentType = useMemo(() => {
    const ct = result?.headers?.["content-type"] ?? "";
    return ct.toLowerCase();
  }, [result]);

  const isJson = contentType.includes("json") || (!contentType && looksLikeJson(result?.body ?? ""));
  const prettyBody = useMemo(() => {
    if (!result?.body) return "";
    if (isJson) {
      try {
        return JSON.stringify(JSON.parse(result.body), null, 2);
      } catch {
        return result.body;
      }
    }
    return result.body;
  }, [result, isJson]);

  return (
    <section className="flex min-h-0 flex-1 flex-col" style={{ borderTop: "1px solid var(--border)" }}>
      <div
        className="flex shrink-0 items-center justify-between px-3"
        style={{ borderBottom: "1px solid var(--border)" }}
      >
        <div className="flex">
          {(
            [
              ["body", "响应体"],
              ["raw", "Raw"],
              ["headers", "响应头"],
            ] as const
          ).map(([key, label]) => (
            <button
              key={key}
              className={cx("ops-tab", tab === key && "ops-tab-active")}
              onClick={() => setRuntime(nodeId, { responseTab: key })}
            >
              {label}
            </button>
          ))}
        </div>
        <div className="flex items-center gap-3 pr-1 text-xs">
          {result ? (
            <>
              <span className={cx(
                "ops-status-pill",
                result.status >= 500 ? "ops-status-5xx" : result.status >= 400 ? "ops-status-4xx" : result.status >= 300 ? "ops-status-3xx" : "ops-status-2xx",
              )}>
                {result.status}
              </span>
              <span className="ops-dim">
                耗时 <b>{result.timeMs} ms</b>
              </span>
              <span className="ops-dim">
                大小 <b>{formatBytes(result.size)}</b>
              </span>
              {contentType && (
                <span className="ops-faint hidden truncate lg:inline" style={{ maxWidth: 200 }}>
                  {result.headers["content-type"]}
                </span>
              )}
              <CopyButton text={result.body} label="复制体" />
            </>
          ) : (
            <span className="ops-faint">Status · Time · Size</span>
          )}
        </div>
      </div>

      <div className="ops-scroll min-h-0 flex-1 p-3">
        {loading && <div className="ops-dim animate-pulse py-6 text-center text-sm">请求发送中…</div>}
        {!loading && error && (
          <ProxyErrorBanner
            message={error}
            onDismiss={() => setRuntime(nodeId, { error: null })}
          />
        )}
        {!loading && !error && !result && (
          <div className="ops-faint grid h-full place-items-center text-sm">
            发送请求后这里显示响应
          </div>
        )}
        {!loading && result && tab === "body" && (
          <div className="ops-code h-full overflow-auto">
            {isJson ? <JsonView text={prettyBody} /> : <pre className="m-0 whitespace-pre-wrap">{result.body}</pre>}
          </div>
        )}
        {!loading && result && tab === "raw" && (
          <pre className="ops-code m-0 h-full overflow-auto whitespace-pre-wrap break-all">{result.body}</pre>
        )}
        {!loading && result && tab === "headers" && (
          <table className="ops-code w-full border-collapse text-left">
            <tbody>
              {Object.entries(result.headers).map(([k, v]) => (
                <tr key={k} className="align-top">
                  <td className="ops-accent pr-4 whitespace-nowrap">{k}</td>
                  <td className="break-all">{v}</td>
                </tr>
              ))}
            </tbody>
          </table>
        )}
      </div>
    </section>
  );
}

function looksLikeJson(s: string): boolean {
  const t = s.trimStart();
  return t.startsWith("{") || t.startsWith("[");
}