annotate.ts

/**
 * Annotate Server
 *
 * Provides a server for annotating arbitrary markdown files.
 * Follows the same patterns as the review server but serves
 * markdown content via /api/plan so the plan editor UI can
 * render it without modifications.
 *
 * Environment variables:
 *   PLANNOTATOR_REMOTE - Set to "1" or "true" for remote/devcontainer mode
 *   PLANNOTATOR_PORT   - Fixed port to use (default: random locally, 19432 for remote)
 */

import { isRemoteSession, getServerPort, getServerHostname } from "./remote";
import { getRepoInfo } from "./repo";
import { handleImage, handleUpload, handleServerReady, handleDraftSave, handleDraftLoad, handleDraftDelete } from "./shared-handlers";
import { handleDoc } from "./reference-handlers";
import { contentHash, deleteDraft } from "./draft";
import { dirname } from "path";

// Re-export utilities
export { isRemoteSession, getServerPort } from "./remote";
export { openBrowser } from "./browser";
export { handleServerReady as handleAnnotateServerReady } from "./shared-handlers";

// --- Types ---

export interface AnnotateServerOptions {
  /** Markdown content of the file to annotate */
  markdown: string;
  /** Original file path (for display purposes) */
  filePath: string;
  /** HTML content to serve for the UI */
  htmlContent: string;
  /** Origin identifier for UI customization */
  origin?: "opencode" | "claude-code" | "pi";
  /** Whether URL sharing is enabled (default: true) */
  sharingEnabled?: boolean;
  /** Custom base URL for share links */
  shareBaseUrl?: string;
  /** Called when server starts with the URL, remote status, and port */
  onReady?: (url: string, isRemote: boolean, port: number) => void;
}

export interface AnnotateServerResult {
  /** The port the server is running on */
  port: number;
  /** The full URL to access the server */
  url: string;
  /** Whether running in remote mode */
  isRemote: boolean;
  /** Wait for user feedback submission */
  waitForDecision: () => Promise<{
    feedback: string;
    annotations: unknown[];
  }>;
  /** Stop the server */
  stop: () => void;
}

// --- Server Implementation ---

const MAX_RETRIES = 5;
const RETRY_DELAY_MS = 500;

/**
 * Start the Annotate server
 *
 * Handles:
 * - Remote detection and port configuration
 * - API routes (/api/plan with mode:"annotate", /api/feedback)
 * - Port conflict retries
 */
export async function startAnnotateServer(
  options: AnnotateServerOptions
): Promise<AnnotateServerResult> {
  const {
    markdown,
    filePath,
    htmlContent,
    origin,
    sharingEnabled = true,
    shareBaseUrl,
    onReady,
  } = options;

  const isRemote = isRemoteSession();
  const configuredPort = getServerPort();
  const hostname = await getServerHostname();
  const draftKey = contentHash(markdown);

  // Detect repo info (cached for this session)
  const repoInfo = await getRepoInfo();

  // Decision promise
  let resolveDecision: (result: {
    feedback: string;
    annotations: unknown[];
  }) => void;
  const decisionPromise = new Promise<{
    feedback: string;
    annotations: unknown[];
  }>((resolve) => {
    resolveDecision = resolve;
  });

  // Start server with retry logic
  let server: ReturnType<typeof Bun.serve> | null = null;

  for (let attempt = 1; attempt <= MAX_RETRIES; attempt++) {
    try {
      server = Bun.serve({
        port: configuredPort,
        hostname: hostname !== "localhost" ? "0.0.0.0" : undefined,

        async fetch(req) {
          const url = new URL(req.url);

          // API: Get plan content (reuse /api/plan so the plan editor UI works)
          if (url.pathname === "/api/plan" && req.method === "GET") {
            return Response.json({
              plan: markdown,
              origin,
              mode: "annotate",
              filePath,
              sharingEnabled,
              shareBaseUrl,
              repoInfo,
            });
          }

          // API: Serve images (local paths or temp uploads)
          if (url.pathname === "/api/image") {
            return handleImage(req);
          }

          // API: Serve a linked markdown document
          // Inject source file's directory as base for relative path resolution
          if (url.pathname === "/api/doc" && req.method === "GET") {
            if (!url.searchParams.has("base")) {
              const docUrl = new URL(req.url);
              docUrl.searchParams.set("base", dirname(filePath));
              return handleDoc(new Request(docUrl.toString()));
            }
            return handleDoc(req);
          }

          // API: Upload image -> save to temp -> return path
          if (url.pathname === "/api/upload" && req.method === "POST") {
            return handleUpload(req);
          }

          // API: Annotation draft persistence
          if (url.pathname === "/api/draft") {
            if (req.method === "POST") return handleDraftSave(req, draftKey);
            if (req.method === "DELETE") return handleDraftDelete(draftKey);
            return handleDraftLoad(draftKey);
          }

          // API: Submit annotation feedback
          if (url.pathname === "/api/feedback" && req.method === "POST") {
            try {
              const body = (await req.json()) as {
                feedback: string;
                annotations: unknown[];
              };

              deleteDraft(draftKey);
              resolveDecision({
                feedback: body.feedback || "",
                annotations: body.annotations || [],
              });

              return Response.json({ ok: true });
            } catch (err) {
              const message =
                err instanceof Error
                  ? err.message
                  : "Failed to process feedback";
              return Response.json({ error: message }, { status: 500 });
            }
          }

          // Serve embedded HTML for all other routes (SPA)
          return new Response(htmlContent, {
            headers: { "Content-Type": "text/html" },
          });
        },
      });

      break; // Success, exit retry loop
    } catch (err: unknown) {
      const isAddressInUse =
        err instanceof Error && err.message.includes("EADDRINUSE");

      if (isAddressInUse && attempt < MAX_RETRIES) {
        await Bun.sleep(RETRY_DELAY_MS);
        continue;
      }

      if (isAddressInUse) {
        const hint = isRemote
          ? " (set PLANNOTATOR_PORT to use different port)"
          : "";
        throw new Error(
          `Port ${configuredPort} in use after ${MAX_RETRIES} retries${hint}`
        );
      }

      throw err;
    }
  }

  if (!server) {
    throw new Error("Failed to start server");
  }

  const serverUrl = `http://${hostname}:${server.port}`;

  // Notify caller that server is ready
  if (onReady) {
    onReady(serverUrl, isRemote, server.port);
  }

  return {
    port: server.port,
    url: serverUrl,
    isRemote,
    waitForDecision: () => decisionPromise,
    stop: () => server.stop(),
  };
}