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

// P5 exit criterion (spec §17): the full admin + billing loop — credit
// decrement matches token usage, and promo redemption grants credits.

const OWNER_EMAIL = "owner@acme.test";
const OWNER_PASSWORD = "e2e-password";

async function signIn(page: Page) {
  await page.goto("/login");
  await page.getByLabel("Email address").fill(OWNER_EMAIL);
  await page.getByLabel("Password").fill(OWNER_PASSWORD);
  await page.getByRole("button", { name: "Sign in" }).click();
  await page.waitForURL((url) => !url.pathname.endsWith("/login"), { timeout: 15000 });
}

async function readBalance(page: Page): Promise<number> {
  await page.getByRole("link", { name: "Credits" }).click();
  await expect(page.getByText("Available credits")).toBeVisible();
  const text = await page.getByTestId("credit-balance").innerText();
  return Number(text.replace(/,/g, ""));
}

test("chat usage decrements credits and shows in the 7-day meter", async ({
  page,
}) => {
  await signIn(page);
  const before = await readBalance(page);

  await page.getByRole("link", { name: /Scout/ }).click();
  await expect(page).toHaveURL(/\/claws\/.+\/chat\//);
  // Fresh session: older sessions carry scenario markers in history that
  // would steer the scripted provider away from the plain echo.
  const before_url = page.url();
  await page.getByRole("button", { name: "New" }).click();
  await page.waitForURL((url) => url.toString() !== before_url);
  const box = page.getByLabel("Message Scout");
  await box.fill("bill me for this message");
  await box.press("Enter");
  await expect(
    page.getByText("I received: bill me for this message"),
  ).toBeVisible();

  await expect
    .poll(async () => readBalance(page), { timeout: 15000 })
    .toBeLessThan(before);
  await expect(page.getByText(/Usage · last 7 days/i)).toBeVisible();
  await expect(page.getByText(/tokens \(/)).toBeVisible();
});

test("a promo code redeems exactly once", async ({ page }) => {
  await signIn(page);
  const before = await readBalance(page);

  await page.getByLabel("Promo code").fill("WELCOME500");
  await page.getByRole("button", { name: "Redeem" }).click();
  await expect(page.getByText("Added 500 credits.")).toBeVisible();
  await expect
    .poll(async () => readBalance(page))
    .toBe(before + 500);

  // Second redemption refuses.
  await page.getByLabel("Promo code").fill("WELCOME500");
  await page.getByRole("button", { name: "Redeem" }).click();
  await expect(
    page.getByText("That code is invalid or already redeemed."),
  ).toBeVisible();
});