import type { Page } from "playwright";

export class WeeklyLimitError extends Error {}
export class AlreadyConnectedError extends Error {}
export class PendingInviteError extends Error {}

/**
 * Sends a LinkedIn connection request without a note.
 * Navigates to the profile page and clicks the Connect button.
 * Throws WeeklyLimitError if the weekly limit popup appears.
 * Throws AlreadyConnectedError / PendingInviteError if already in that state.
 */
export async function sendConnectionRequest(page: Page, linkedinUrl: string): Promise<void> {
  await page.goto(linkedinUrl, { waitUntil: "domcontentloaded", timeout: 30000 });
  await page.waitForTimeout(2000 + Math.random() * 1000);

  // Already connected? Primary signal: presence of the profile's "Message" link
  // (only shown to 1st-degree connections) — an href attribute, not a CSS class
  // or translated text, so it survives LinkedIn's class-name hashing and non-
  // English UI languages. Falls back to the old text-scrape for accounts/layouts
  // where that link isn't found as a plain <a href>.
  //
  // MUST be scoped to the visited person's own intro/top card — a page-wide
  // search also matches "Message" links / "1st" badges belonging to OTHER
  // people rendered elsewhere on the page (sidebar modules like "People also
  // viewed"). For a non-connected target this false-positived AlreadyConnected,
  // which skipped the real invite AND (via the message step that follows) sent
  // a message to a random unrelated 1st-degree connection instead of the
  // target — see CLAUDE.md / memory for the Jul 2026 incident. The top card is
  // identified structurally as the section containing the page's own <h1> name
  // heading, robust to class-name hashing. Mirrors the same fix in visit.ts.
  const topCard = page.locator("main section").filter({ has: page.locator("h1") }).first();
  const hasMessageLink = await topCard.locator('a[href*="/messaging/compose"]').first().count() > 0;
  if (hasMessageLink) throw new AlreadyConnectedError("Already connected");
  const pageText = await topCard.innerText().catch(() => "");
  if (/\b1st\b/.test(pageText)) throw new AlreadyConnectedError("Already connected");

  // Pending?
  if (/\bPending\b/.test(pageText)) throw new PendingInviteError("Invitation already pending");
  const pendingBtn = page.locator('button[aria-label*="Pending"]:visible');
  if (await pendingBtn.count() > 0) throw new PendingInviteError("Invitation already pending");

  // Case 1: Direct Connect link (primary CTA) — navigate to its href directly.
  // Clicking fails because the Sales Nav overlay SVG intercepts pointer events.
  const directConnect = page.locator('a[aria-label*="Invite"][aria-label*="to connect"]:visible, a[href*="custom-invite"]:visible').first();
  if (await directConnect.count() > 0) {
    const href = await directConnect.getAttribute("href");
    if (!href) throw new Error("Connect link has no href");
    const inviteUrl = href.startsWith("http") ? href : `https://www.linkedin.com${href}`;
    await page.goto(inviteUrl, { waitUntil: "domcontentloaded", timeout: 30000 });
    await page.waitForTimeout(1000);
  } else {
    // Case 2: Connect is inside the "..." More menu
    // LinkedIn has two "More" buttons on page: [0] = nav bar, [1] = profile card
    const moreBtn = page.locator('button[aria-label="More"]:visible').nth(1);
    await moreBtn.click();
    await page.waitForTimeout(800);

    // Check for Pending in the menu — means invite was already sent
    const pendingMenuItem = page.locator('[role="menuitem"]:has-text("Pending"):visible');
    if (await pendingMenuItem.count() > 0) throw new PendingInviteError("Invitation already pending (found in More menu)");

    const connectOption = page.locator('[role="menuitem"]:has-text("Connect"):visible');
    if (await connectOption.count() === 0) throw new Error("Connect option not found in More menu");
    await connectOption.first().click();
  }

  await page.waitForTimeout(1000);

  // Click "Send without a note" / "Send now"
  const sendBtn = page.locator(
    'button:has-text("Send now"), button[aria-label*="Send without"], button[aria-label*="Send invitation"]:not([aria-label*="note"])'
  );
  if (await sendBtn.count() > 0) {
    await sendBtn.first().click({ force: true });
    await page.waitForTimeout(1500);
  }

  // Check for weekly limit popup
  const limitPopup = page.locator('div[class*="ip-fuse-limit-alert__warning"]');
  if (await limitPopup.count() > 0) throw new WeeklyLimitError("Weekly connection limit reached");

  // Check for error toast
  const errorToast = page.locator('div[data-test-artdeco-toast-item-type="error"]:visible');
  if (await errorToast.count() > 0) {
    const msg = await errorToast.innerText();
    throw new Error(`Connection error: ${msg.trim()}`);
  }
}