import { test, expect, type Page } from "@playwright/test";
import { existsSync, readFileSync } from "node:fs";
import { resolve } from "node:path";

const romPath = resolve(process.env.CRYSTAL_ROM_PATH ?? "Pokemon - Crystal Version (UE) (V1.1) [C][!].gbc");

async function start(page: Page) {
  // Replace only this test's runtime module response, the same way
  // battle-browser.spec.ts substitutes an encounter fixture: no fixture
  // import or map override exists in the application or production build.
  await page.route("**/src/game/runtime.ts", async (route) => {
    const response = await route.fetch();
    const source = await response.text();
    const needle = "const world = new GameWorld(assets);";
    expect(source).toContain(needle);
    // Fixture worlds stand in for a saved session, so no introduction runs.
    expect(source).toContain("this.world?.beginIntro();");
    await route.fulfill({ response, body: source.replace("this.world?.beginIntro();", "").replace(needle,
      `const { martFixtureWorld } = await import('/tests/mart-fixture.ts');
       const world = martFixtureWorld(assets);`) });
  });
  await page.clock.install({ time: new Date("2026-09-22T12:00:00") });
  await page.goto("/");
  await page.locator("#rom-file").setInputFiles(romPath);
  await expect(page.locator("#status")).toContainText("verified");
  await page.clock.pauseAt(new Date("2026-09-22T12:05:00"));
  await page.locator("#play").click();
}

async function exportState(page: Page) {
  await page.locator("#tab-saves").click();
  const download = page.waitForEvent("download");
  await page.locator("#backup").click();
  const path = (await (await download).path())!;
  const record = JSON.parse(readFileSync(path, "utf8"));
  await page.locator("#tab-game").click();
  return JSON.parse(Buffer.from(record.state, "base64").toString("utf8"));
}

test.beforeEach(() => test.skip(!existsSync(romPath), "Requires the local user ROM; only map-enabling is a test fixture."));

test("buys a Potion from the Cherrygrove clerk with the keyboard", async ({ page }) => {
  await start(page);

  // The fixture places the player at the counter, already facing the clerk.
  await page.keyboard.press("KeyX");
  await expect(page.locator("#mart")).toBeVisible();
  await expect(page.locator("#mart-menu")).toContainText("BUY");

  await page.keyboard.press("KeyX"); // BUY is already highlighted
  await expect(page.locator("#mart-menu")).toContainText("POTION");

  await page.keyboard.press("KeyX"); // the Potion is first and already highlighted
  await expect(page.locator(".mart-quantity output")).toHaveText(/×1/);
  await page.keyboard.press("ArrowUp"); // quantity 2, exercising the stepper
  await expect(page.locator(".mart-quantity output")).toHaveText(/×2/);

  await page.keyboard.press("KeyX"); // confirm the quantity
  await expect(page.locator("#dialogue-text")).toContainText("will be");
  await expect(page.locator("#dialogue-choice")).toContainText("YES");
  await page.keyboard.press("KeyX"); // YES is already highlighted

  await expect(page.locator("#dialogue-text")).toContainText("Here you are");
  await page.keyboard.press("KeyX"); // continue

  // Back at the item list (BuyMenu loops for another purchase); leave.
  await expect(page.locator("#mart-menu")).toContainText("POTION");
  await page.keyboard.press("KeyZ"); // back out of the list
  await page.keyboard.press("KeyZ"); // quit the BUY/SELL/QUIT menu

  await expect(page.locator("#dialogue-text")).toContainText("Please come again");
  await page.keyboard.press("KeyX");

  await expect(page.locator("#mart")).toBeHidden();
  await expect(page.locator("#game-notice")).toHaveText("");

  const state = await exportState(page);
  expect(state.money).toBe(3000 - 300 * 2);
  expect(state.bag.items).toEqual([{ item: 18, quantity: 2 }]);
});