# All files / src/components/display EventRenderer.tsx

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     import {
      type ReactNode,
      useState,
      lazy,
      Suspense,
      type LazyExoticComponent,
      type ComponentType,
      type JSX,
    } from "react";
    import { ChevronDown, ChevronRight } from "lucide-react";
    import Markdown, { type Components, type ExtraProps } from "react-markdown";
    import rehypePrismPlus from "rehype-prism-plus/common";
    import remarkGfm from "remark-gfm";
    import type { SessionEvent } from "../../hooks/types.js";
    import { detectDelegation, delegationIdentityKey, deriveChildSessionId } from "@grackle-ai/common";
    import { formatTokens, formatCost } from "../../utils/format.js";
    import { ICON_SM } from "../../utils/iconSize.js";
    import { ToolCard } from "../tools/ToolCard.js";
    import type { McpAppWidgetProps } from "./McpAppWidget.js";
    import type { McpUiResourceCsp } from "@modelcontextprotocol/ext-apps/app-bridge";
    import type { CallToolResult } from "@modelcontextprotocol/sdk/types.js";
    import { CopyButton } from "./CopyButton.js";
    import styles from "./EventRenderer.module.scss";

    // Lazy-loaded (and intentionally NOT re-exported from the package barrel) so the
    // heavy ext-apps AppBridge is code-split into an async chunk loaded only when a
    // widget actually renders — keeps the main chat bundle under the chunk-size cap.
    const McpAppWidget: LazyExoticComponent<ComponentType<McpAppWidgetProps>> = lazy(() =>
      import("./McpAppWidget.js").then((m) => ({ default: m.McpAppWidget })),
    );

    /** Props for the EventRenderer component. */
    interface Props {
      event: SessionEvent;
      /** Paired tool_use context, attached by SessionPanel when raw IDs match. */
      toolUseCtx?: { tool: string; args: unknown; detailedResult?: string };
      /** True when a tool_use completed but has no tool_result (e.g. Claude Code text-result pattern). */
      settled?: boolean;
      /** Sandbox proxy origin URL for rendering MCP Apps widget events (different origin than the app). */
      sandboxProxyUrl?: string;
      /** Open a file in the live-docs pane (#1396) — makes `file://` links and tool file paths clickable. */
      onOpenDocument?: (uri: string) => void;
    }

    /**
     * Compute the materialized child session id for a delegation tool call, using
     * the same shared derivation the server uses to create the child (#1075), so the
     * agent card can link to the subagent's activity view. Returns undefined for
     * non-delegation tools or when the parent session / tool-call id is unknown.
     */
    function delegationChildId(
      parentSessionId: string,
      toolCallId: string | undefined,
      tool: string,
      args: unknown,
    ): string | undefined {
      if (!parentSessionId || !toolCallId) {
        return undefined;
      }
      const info = detectDelegation(tool, args);
      if (!info) {
        return undefined;
      }
      return deriveChildSessionId(parentSessionId, delegationIdentityKey(info, toolCallId));
    }

    // --- Individual event type renderers ---

    /** Number of lines shown in the collapsed system context preview. */
    const SYSTEM_CONTEXT_PREVIEW_LINES: number = 3;

    /** Renders the system context (system prompt) as a collapsible left-bordered section. */
    function SystemContextEvent({ content }: { content: string }): JSX.Element {
      const [expanded, setExpanded] = useState(false);
      const lines = content.split("\n");
      const hasMore = lines.length > SYSTEM_CONTEXT_PREVIEW_LINES;
      const displayContent = expanded
        ? content
        : lines.slice(0, SYSTEM_CONTEXT_PREVIEW_LINES).join("\n");

      return (
        <div className={styles.systemContextEvent} data-testid="system-context-event">
          <button
            type="button"
            className={styles.systemContextHeader}
            onClick={() => {
              setExpanded((v) => !v);
            }}
            aria-expanded={expanded}
          >
            <span className={styles.systemContextBadge}>SYSTEM PROMPT</span>
            {hasMore && (
              <span className={styles.systemContextToggle} aria-hidden="true">
                {expanded ? <ChevronDown size={ICON_SM} /> : <ChevronRight size={ICON_SM} />}
              </span>
            )}
          </button>
          <pre className={styles.systemContextPre}>
            {displayContent}
            {!expanded && hasMore && <span className={styles.systemContextEllipsis}>{"\u2026"}</span>}
          </pre>
        </div>
      );
    }

    /** Renders a system-level event with timestamp. */
    function SystemEvent({ time, content }: { time: string; content: string }): JSX.Element {
      return (
        <div className={styles.systemEvent}>
          <span className={styles.systemTimestamp}>[{time}]</span> {content}
        </div>
      );
    }

    /** Recursively extracts plain text from React children (for code block copy). */
    export function extractText(node: ReactNode): string {
      if (typeof node === "string") {
        return node;
      }
      if (typeof node === "number") {
        return String(node);
      }
      if (Array.isArray(node)) {
        return node.map(extractText).join("");
      }
      if (node !== null && node !== undefined && typeof node === "object" && "props" in node) {
        return extractText((node as { props: { children?: ReactNode } }).props.children);
      }
      return "";
    }

    /** Props passed by react-markdown to component overrides. */
    interface PreProps extends React.HTMLAttributes<HTMLPreElement> {
      children?: ReactNode;
      /** AST node injected by react-markdown — must not be spread onto the DOM element. */
      node?: unknown;
    }

    /** Wraps markdown `<pre>` blocks with a CopyButton for code-only copy. */
    function CodeBlockWrapper({ children, node, ...preProps }: PreProps): JSX.Element {
      // node is destructured solely to exclude it from the DOM spread
      if (node === undefined) {
        /* intentionally unused */
      }
      const rawText = extractText(children);
      return (
        <div className={styles.codeBlockWrapper}>
          <pre {...preProps}>{children}</pre>
          <CopyButton
            text={rawText}
            data-testid="copy-code-block"
            className={styles.codeBlockCopyButton}
          />
        </div>
      );
    }

    /**
     * Renders a markdown string with GFM support and syntax-highlighted code blocks.
     *
     * Shared by both assistant text events and user input events so the two render
     * through an identical pipeline. When `onOpenDocument` is provided, `file://`
     * links open in the live-docs pane instead of navigating (#1396).
     */
    function MarkdownContent({
      content,
      onOpenDocument,
    }: {
      content: string;
      onOpenDocument?: (uri: string) => void;
    }): JSX.Element {
      const components: Components = {
        pre: CodeBlockWrapper,
        a(props: JSX.IntrinsicElements["a"] & ExtraProps) {
          const { href, children } = props;
          if (href && href.startsWith("file://") && onOpenDocument) {
            return (
              <a
                href={href}
                onClick={(e) => {
                  e.preventDefault();
                  onOpenDocument(href);
                }}
              >
                {children}
              </a>
            );
          }
          return (
            <a href={href} target="_blank" rel="noreferrer noopener">
              {children}
            </a>
          );
        },
      };
      return (
        <Markdown remarkPlugins={[remarkGfm]} rehypePlugins={[rehypePrismPlus]} components={components}>
          {content}
        </Markdown>
      );
    }

    /** Renders an assistant text output event with markdown formatting. */
    function TextEvent({
      content,
      onOpenDocument,
    }: {
      content: string;
      onOpenDocument?: (uri: string) => void;
    }): JSX.Element {
      return (
        <div className={styles.textEvent}>
          <MarkdownContent content={content} onOpenDocument={onOpenDocument} />
        </div>
      );
    }

    // ToolUseEvent and ToolResultEvent have been replaced by the ToolCard component
    // in packages/web/src/components/tools/. See ToolCard.tsx for the router and
    // individual card components (FileReadCard, FileEditCard, ShellCard, etc.).

    /** Renders an error event with red styling. */
    function ErrorEvent({ content }: { content: string }): JSX.Element {
      return <div className={styles.errorEvent}>Error: {content}</div>;
    }

    /** Renders a status change event with separator lines. */
    function StatusEvent({ content }: { content: string }): JSX.Element {
      return <div className={styles.statusEvent}>--- {content} ---</div>;
    }

    /** Renders a user input event as markdown, right-aligned to distinguish it from agent output. */
    function UserInputEvent({ content }: { content: string }): JSX.Element {
      return (
        <div className={styles.userInputEvent}>
          <div className={styles.userInputContent} data-testid="user-input-content">
            <MarkdownContent content={content} />
          </div>
        </div>
      );
    }

    /** Renders a signal event (e.g. SIGCHLD) as a left-bordered banner. */
    function SignalEvent({ content }: { content: string }): JSX.Element {
      return (
        <div className={styles.signalEvent} data-testid="signal-event">
          <span className={styles.signalBadge}>SIGNAL</span>
          <span className={styles.signalContent}>{content}</span>
        </div>
      );
    }

    /** Renders a usage event as a compact cost badge. */
    function UsageEvent({ content }: { content: string }): JSX.Element {
      let label = content;
      try {
        const data = JSON.parse(content) as Record<string, unknown>;
        const inTok = Number(data.input_tokens) || 0;
        const outTok = Number(data.output_tokens) || 0;
        const tokens = formatTokens(inTok + outTok);
        const cost = formatCost(Number(data.cost_millicents) || 0);
        label = `${tokens} tokens \u00b7 ${cost}`;
      } catch {
        /* show raw content if JSON fails */
      }
      return (
        <div className={styles.usageEvent} data-testid="usage-event">
          <span className={styles.usageBadge}>{label}</span>
        </div>
      );
    }

    /** Renders an unrecognized event type. */
    function DefaultEvent({ content }: { content: string }): JSX.Element {
      return <div className={styles.defaultEvent}>{content}</div>;
    }

    // --- Main component ---

    /** Renders a single session event, dispatching to the appropriate type-specific renderer. */
    export function EventRenderer({
      event,
      toolUseCtx,
      settled,
      sandboxProxyUrl,
      onOpenDocument,
    }: Props): JSX.Element {
      const time = new Date(event.timestamp).toLocaleTimeString();

      switch (event.eventType) {
        case "widget": {
          // MCP Apps widget event (pushed by the broker). Self-contained: HTML +
          // tool input/result. Renders in the cross-origin sandbox via McpAppWidget.
          if (!sandboxProxyUrl) {
            return <DefaultEvent content={event.content} />;
          }
          let payload: {
            html?: string;
            rendererKind?: string;
            // `allowInlineScripts`/`allowUnsafeEval` are Grackle extensions to the
            // upstream CSP type (agent-authored widgets #1239; React runtime #1268);
            // forwarded verbatim to the sandbox.
            csp?: McpUiResourceCsp & { allowInlineScripts?: boolean; allowUnsafeEval?: boolean };
            toolInput?: Record<string, unknown>;
            toolResult?: CallToolResult;
            // Resolved registry dependencies for composition (#1270), eval order.
            components?: Array<{ name: string; body: string }>;
          } = {};
          try {
            payload = JSON.parse(event.content) as typeof payload;
          } catch {
            /* malformed widget payload — fall back */
          }
          // Dispatch on rendererKind (default "mcp-app-html" for back-compat). This
          // switch is the seam for declarative/runtime renderers.
          const rendererKind: string = payload.rendererKind ?? "mcp-app-html";
          // GenUX React runtime (#1268): payload.html is JSX *source* (not a full
          // document). Render it via a bootstrap that loads the runtime bundle from the
          // sandbox origin; the source + props are delivered as tool input. The runtime
          // transpiles + renders the component against the Grackle component library.
          // An absolute runtime.js URL is required — the inner iframe is written via
          // doc.write (about:blank base), so a relative "/runtime.js" would not resolve.
          if (rendererKind === "grackle-react" && payload.html) {
            const sandboxOrigin: string = new URL(sandboxProxyUrl, window.location.href).origin;
            const bootstrap: string =
              `<!doctype html><html><head><meta charset="utf-8"></head>` +
              `<body><div id="grackle-root"></div>` +
              `<script type="module" src="${sandboxOrigin}/runtime.js"></script></body></html>`;
            return (
              <Suspense fallback={<DefaultEvent content="Loading widget..." />}>
                <McpAppWidget
                  widgetHtml={bootstrap}
                  sandboxProxyUrl={sandboxProxyUrl}
                  csp={payload.csp}
                  toolInput={{
                    source: payload.html,
                    props: payload.toolInput ?? {},
                    components: payload.components ?? [],
                  }}
                />
              </Suspense>
            );
          }
          if (rendererKind !== "mcp-app-html" || !payload.html) {
            return <DefaultEvent content={event.content} />;
          }
          return (
            <Suspense fallback={<DefaultEvent content="Loading widget..." />}>
              <McpAppWidget
                widgetHtml={payload.html}
                sandboxProxyUrl={sandboxProxyUrl}
                csp={payload.csp}
                toolInput={payload.toolInput}
                toolResult={payload.toolResult}
              />
            </Suspense>
          );
        }
        case "system": {
          // Detect system context events via the raw metadata marker
          if (event.raw) {
            try {
              const rawData = JSON.parse(event.raw) as Record<string, unknown>;
              if (rawData.systemContext === true) {
                return <SystemContextEvent content={event.content} />;
              }
            } catch {
              /* not JSON, render as normal system event */
            }
          }
          return <SystemEvent time={time} content={event.content} />;
        }
        case "text":
        case "output":
          return <TextEvent content={event.content} onOpenDocument={onOpenDocument} />;
        case "tool_use": {
          let tool = "";
          let args: unknown = {};
          try {
            const parsed = JSON.parse(event.content) as { tool?: string; args?: unknown };
            tool = parsed.tool || "";
            args = parsed.args;
          } catch {
            /* fallback to empty */
          }
          // When settled, pass empty result so the card shows as completed (no spinner)
          // rather than in-progress. This handles Claude Code which emits results as text.
          return (
            <ToolCard
              tool={tool}
              args={args}
              result={settled ? "" : undefined}
              childSessionId={delegationChildId(event.sessionId, event.toolCallId, tool, args)}
              onOpenDocument={onOpenDocument}
            />
          );
        }
        case "tool_result": {
          // When paired, toolUseCtx provides the tool name, args, and optional detailedResult.
          // When unpaired, fall back to a generic display.
          //
          // Error detection (#1362): prefer the first-class `toolError` field,
          // set by every runtime adapter from its native outcome signal and
          // carried across the AHP wire as `result.success`. Fall back to the
          // structured `content.is_ok === false` shape the reverse mapper writes
          // (HR8d #1355), then to the legacy `raw.is_error` path for pre-HR8d
          // JSONL replay.
          let isError = event.toolError === true;
          if (!isError) {
            try {
              const parsed = JSON.parse(event.content) as Record<string, unknown>;
              if (parsed.is_ok === false) {
                isError = true;
              }
            } catch {
              /* content not JSON — fall through to legacy raw check */
            }
          }
          if (!isError && event.raw) {
            try {
              const rawData = JSON.parse(event.raw) as Record<string, unknown>;
              isError = rawData.is_error === true;
            } catch {
              /* ignore */
            }
          }

          // Try to extract displayable content from JSON-wrapped results.
          // Guard with startsWith check to avoid throwing on plain text content.
          let resultContent = event.content;
          if (event.content.trimStart().startsWith("{")) {
            try {
              const parsed = JSON.parse(event.content) as Record<string, unknown>;
              if (typeof parsed.content === "string") {
                resultContent = parsed.content;
              }
            } catch {
              /* content looks like JSON but isn't — use as-is */
            }
          }

          if (toolUseCtx) {
            return (
              <ToolCard
                tool={toolUseCtx.tool}
                args={toolUseCtx.args}
                result={resultContent}
                isError={isError}
                detailedResult={toolUseCtx.detailedResult}
                childSessionId={delegationChildId(
                  event.sessionId,
                  event.toolCallId,
                  toolUseCtx.tool,
                  toolUseCtx.args,
                )}
                onOpenDocument={onOpenDocument}
              />
            );
          }
          // Unpaired tool_result — use generic card with fallback label
          return (
            <ToolCard
              tool="Tool output"
              args={undefined}
              result={resultContent}
              isError={isError}
              onOpenDocument={onOpenDocument}
            />
          );
        }
        case "error":
          return <ErrorEvent content={event.content} />;
        case "status":
          return <StatusEvent content={event.content} />;
        case "user_input":
          return <UserInputEvent content={event.content} />;
        case "signal":
          return <SignalEvent content={event.content} />;
        case "usage":
          return <UsageEvent content={event.content} />;
        default:
          return <DefaultEvent content={event.content} />;
      }
    }