/**
 * User stories covered: Feature 21 — Edit highlight on resubmitted PO
 *   - When a MANAGER reviews a PO that was resubmitted after edits were requested,
 *     changed fields are visually highlighted (ring-, border-warning, bg-warning, etc.)
 *
 * Implementation context (po-detail.tsx):
 *   - The `resubmitSnapshot` is stored in the SUBMITTED action's metadata when
 *     a submitter resubmits after EDITS_REQUESTED.
 *   - po-detail.tsx uses `originalLineItems` and renders a diff label.
 *   - Changed line items get strikethrough styling (old values) and bold new values.
 *   - Header fields (vessel, vendor, etc.) use a ring/border highlight when changed.
 *
 * To drive this flow:
 *   1. Tech submits PO
 *   2. Manager requests edits (with a note)
 *   3. Tech edits the PO and resubmits
 *   4. Manager reviews — changed fields should be highlighted
 *
 * Created: 2026-05-17
 */
import { test, expect, type BrowserContext } from "@playwright/test";
import { fillFirstLineItem, fillPoHeader, login, USERS } from "./helpers/login";

async function driveEditHighlightFlow(
  page: import("@playwright/test").Page,
  context: BrowserContext,
  title: string
): Promise<string> {
  // Step 1: Submit as tech
  await login(page, USERS.TECH);
  await page.goto("/po/new");
  await fillPoHeader(page, title);
  await fillFirstLineItem(page, {
    name: "Original item",
    quantity: "2",
    unitPrice: "150",
  });
  await page.getByRole("button", { name: /submit for approval/i }).click();
  await expect(page).toHaveURL(/\/po\//, { timeout: 15_000 });
  const poUrl = page.url();
  const poId = poUrl.split("/po/")[1].replace(/\/$/, "");

  // Step 2: Manager requests edits
  await context.clearCookies();
  await login(page, USERS.MANAGER);
  await page.goto(poUrl);
  await page.getByRole("button", { name: /request edits/i }).click();
  const noteInput = page.getByPlaceholder(/reason|note/i).first();
  await noteInput.fill("Please update the quantity");
  await page.getByRole("button", { name: /request edits/i }).last().click();
  await expect(page.getByText(/edits requested/i)).toBeVisible({ timeout: 10_000 });

  // Step 3: Tech edits and resubmits
  await context.clearCookies();
  await login(page, USERS.TECH);
  await page.goto(poUrl);
  await page.getByRole("link", { name: /edit/i }).click();
  await expect(page).toHaveURL(/\/edit$/, { timeout: 10_000 });

  // Change the quantity
  const qtyInput = page.getByRole("spinbutton").first();
  await qtyInput.click({ clickCount: 3 });
  await qtyInput.fill("5");

  await page.getByRole("button", { name: /resubmit|update/i }).click();
  await expect(page).toHaveURL(/\/po\//, { timeout: 15_000 });

  // Step 4: Manager should now see highlighted changes
  await context.clearCookies();
  await login(page, USERS.MANAGER);

  // PO should now be in MGR_REVIEW again — navigate to the approval detail page
  return `/approvals/${poId}`;
}

test.describe("Feature 21 — Edit highlights on resubmitted PO", () => {
  test("US-21a: manager sees a diff indicator when a PO has been resubmitted after edits", async ({
    page,
    context,
  }: {
    page: import("@playwright/test").Page;
    context: BrowserContext;
  }) => {
    let approvalUrl: string;
    try {
      approvalUrl = await driveEditHighlightFlow(
        page,
        context,
        `E2E_EDITHIGHLIGHT_${Date.now()}`
      );
    } catch (err) {
      test.skip(true, `Could not drive edit highlight flow: ${(err as Error).message}`);
      return;
    }

    await page.goto(approvalUrl);
    await page.waitForLoadState("networkidle");

    // The approval detail page should display the PO detail with diff information.
    // po-detail.tsx shows: "Submitter updated these line items after edits were requested."
    // along with strikethrough on old values.
    const diffLabel = page.getByText(
      /submitter updated|edits were requested|previous values/i
    );
    const strikethrough = page.locator("s, del, [class*='line-through']");

    const hasDiffLabel = await diffLabel.isVisible();
    const hasStrikethrough = (await strikethrough.count()) > 0;

    expect(hasDiffLabel || hasStrikethrough).toBeTruthy();
    console.log(
      hasDiffLabel
        ? "✓ Diff label visible (submitter updated line items after edits)"
        : "✓ Strikethrough on changed line items visible"
    );
  });

  test("US-21a: resubmitted PO shows at least one highlight or diff indicator", async ({
    page,
    context,
  }: {
    page: import("@playwright/test").Page;
    context: BrowserContext;
  }) => {
    let approvalUrl: string;
    try {
      approvalUrl = await driveEditHighlightFlow(
        page,
        context,
        `E2E_EDITHI2_${Date.now()}`
      );
    } catch (err) {
      test.skip(true, `Could not drive edit highlight flow: ${(err as Error).message}`);
      return;
    }

    await page.goto(approvalUrl);
    await page.waitForLoadState("networkidle");

    // Look for any visual highlighting: ring-*, border-warning, bg-warning,
    // bg-yellow-*, strikethrough text, or the diff description paragraph
    const highlights = page.locator(
      "[class*='ring-'], [class*='border-warning'], [class*='bg-warning'], [class*='bg-yellow'], s, del, [class*='line-through']"
    );
    const diffText = page.getByText(/edits were requested|updated.*line items|previous values/i);

    const highlightCount = await highlights.count();
    const hasDiffText = await diffText.isVisible();

    expect(highlightCount > 0 || hasDiffText).toBeTruthy();
    console.log(
      `✓ Found ${highlightCount} highlight element(s) and diff text: ${hasDiffText}`
    );
  });
});