import { test, expect, type Page } from "@playwright/test";

// Override with BASE_URL (e.g. when the dev server runs on another port).
const BASE = process.env.BASE_URL ?? "http://localhost:3000";

// Collects browser console errors and page errors for the duration of a test.
function trackErrors(page: Page): string[] {
  const errors: string[] = [];
  page.on("console", (msg) => {
    if (msg.type() === "error") {
      errors.push(msg.text());
    }
  });
  page.on("pageerror", (err) => {
    errors.push(String(err));
  });
  return errors;
}

// Autosave is debounced at 500 ms; give it time before reloading.
const DEBOUNCE_MS = 700;

test("undo and redo a campaign name edit", async ({ page }) => {
  const errors = trackErrors(page);
  await page.goto(`${BASE}/`);

  const original = await page.locator("#campaign-name").inputValue();
  const undo = page.getByRole("button", { name: "Отменить" });
  const redo = page.getByRole("button", { name: "Вернуть" });

  // Fresh history: both buttons are disabled.
  await expect(undo).toBeDisabled();
  await expect(redo).toBeDisabled();

  // One edit burst; the undo button wakes up immediately (the burst does
  // not need to settle first).
  const edited = "Имя для отмены";
  await page.locator("#campaign-name").fill(edited);
  await expect(undo).toBeEnabled();

  await undo.click();
  await expect(page.locator("#campaign-name")).toHaveValue(original);

  await redo.click();
  await expect(page.locator("#campaign-name")).toHaveValue(edited);

  // Keyboard: Ctrl+Z outside a text field undoes the redo.
  await page.locator(".version").click();
  await page.keyboard.press("Control+z");
  await expect(page.locator("#campaign-name")).toHaveValue(original);

  expect(errors).toEqual([]);
});

test("Ctrl+Z inside a text field keeps the browser's native undo", async ({
  page,
}) => {
  const errors = trackErrors(page);
  await page.goto(`${BASE}/`);

  const input = page.locator("#campaign-name");
  await input.fill("Текст набран в поле");
  await input.press("Control+z");

  // The app-wide handler must not fire while the field has focus: the
  // undo button stays enabled (the pending burst is still undoable).
  // The field's own value change is the browser's native undo — it
  // owns Ctrl+Z inside text fields by design.
  await expect(page.getByRole("button", { name: "Отменить" })).toBeEnabled();

  expect(errors).toEqual([]);
});

test("undone state survives a reload", async ({ page }) => {
  const errors = trackErrors(page);
  await page.goto(`${BASE}/`);

  const original = await page.locator("#campaign-name").inputValue();
  const edited = "Будет отменено до перезагрузки";
  await page.locator("#campaign-name").fill(edited);
  await page.getByRole("button", { name: "Отменить" }).click();
  await expect(page.locator("#campaign-name")).toHaveValue(original);

  // The undo went through the autosave path; wait for the debounce.
  await page.waitForTimeout(DEBOUNCE_MS);
  await page.reload();
  await expect(page.locator("#campaign-name")).toHaveValue(original);

  expect(errors).toEqual([]);
});

test("clear is undoable", async ({ page }) => {
  const errors = trackErrors(page);
  await page.goto(`${BASE}/`);

  const original = await page.locator("#campaign-name").inputValue();
  await page.getByRole("button", { name: "Очистить" }).click();
  await page.locator(".modal").getByRole("button", { name: "Очистить" }).click();
  await expect(page.locator("#campaign-name")).toHaveValue("");

  // One undo step restores everything the clear replaced.
  await page.getByRole("button", { name: "Отменить" }).click();
  await expect(page.locator("#campaign-name")).toHaveValue(original);

  expect(errors).toEqual([]);
});