background.js

const CONTEXT_MENU_ID = "openpm-generate-prd";
const MAX_INPUT_CHARS = 10000;

chrome.runtime.onInstalled.addListener(async () => {
  await chrome.contextMenus.removeAll();
  chrome.contextMenus.create({
    id: CONTEXT_MENU_ID,
    title: "Generate PRD with OpenPM",
    contexts: ["selection"]
  });

  try {
    await chrome.sidePanel.setPanelBehavior({ openPanelOnActionClick: true });
  } catch {
    // Some Chrome builds may not support panel behavior in all contexts.
  }
});

chrome.contextMenus.onClicked.addListener(async (info, tab) => {
  if (info.menuItemId !== CONTEXT_MENU_ID) {
    return;
  }

  const selectedText = (info.selectionText || "").trim().slice(0, MAX_INPUT_CHARS);
  if (!selectedText) {
    return;
  }

  await chrome.storage.local.set({
    pendingUserPrompt: selectedText,
    pendingPromptSource: "selection"
  });

  if (tab?.id) {
    try {
      await chrome.sidePanel.open({ tabId: tab.id });
    } catch {
      // If opening fails, user can click extension action manually.
    }
  }
});