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");
test.beforeEach(() => test.skip(!existsSync(romPath), "Requires the local user ROM."));

async function start(
  page: Page,
  fixture: "questFixtureWorld" | "questRivalFixtureWorld" | "questLabFixtureWorld",
) {
  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);
    await route.fulfill({ response, body: source.replace(needle,
      `const { ${fixture} } = await import('/tests/quest-fixture.ts');
       const world = ${fixture}(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 step(page: Page, direction: string) {
  await page.keyboard.down(`Arrow${direction}`);
  await page.clock.runFor(70);
  await page.keyboard.up(`Arrow${direction}`);
  await page.clock.runFor(300);
}

async function drive(page: Page, name = "") {
  const messages: string[] = [];
  for (let guard = 0; guard < 180; guard++) {
    if (await page.locator("#battle").isVisible()) {
      messages.push(await page.locator("#battle-text").innerText());
      const menu = page.locator("#battle-menu");
      const fight = menu.getByRole("button", { name: "FIGHT", exact: true });
      if (await fight.count()) {
        await fight.click();
        await menu.getByRole("button", { name: /SCRATCH/ }).click();
      } else if (await menu.getByRole("button", { name: /Continue/ }).count()) {
        await menu.getByRole("button", { name: /Continue/ }).click();
      } else await page.clock.runFor(1200);
    } else if (await page.locator("#dialogue-choice input").isVisible()) {
      messages.push(await page.locator("#dialogue-text").innerText());
      const input = page.locator("#dialogue-choice input");
      await expect(input).toBeFocused();
      await input.fill(name);
      await input.press("Enter");
      await page.clock.runFor(500);
    } else if (await page.locator("#native-dialogue").isVisible()) {
      messages.push(await page.locator("#dialogue-text").innerText());
      await page.keyboard.press("KeyX");
      await page.clock.runFor(500);
    } else if (await page.locator("#game-screen").getAttribute("data-activity") !== "idle") {
      await page.clock.runFor(500);
    } else {
      // A scene script starts a tick after the tick that ends a warp, so a
      // single idle observation is not the end of the scene.
      await page.clock.runFor(200);
      if (
        (await page.locator("#game-screen").getAttribute("data-activity")) !== "idle" ||
        (await page.locator("#native-dialogue").isVisible())
      )
        continue;
      await expect(page.locator("#game-notice")).toHaveText("");
      return messages.join("\n");
    }
  }
  throw new Error("Quest scene did not finish.");
}

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

test("Mr. Pokémon's ROM scene grants the Egg and Pokédex, heals and survives reload", async ({ page }) => {
  await start(page, "questFixtureWorld");
  await step(page, "Up");
  await expect(page.locator("#game-screen")).toHaveAttribute("data-map", "26:10");
  const shown = await drive(page);
  expect(shown).toContain("MYSTERY EGG");
  expect(shown).toContain("POKéDEX");
  const { path, state } = await backup(page);
  expect(state.events).toContain(30);
  expect(state.bag.keyItems).toContain(0x45);
  expect(state.scenes).toMatchObject({ "26:10": 1, "26:3": 1, "24:5": 3 });
  expect(state.party[0].hp).toBe(state.party[0].stats[0]);
  expect(state.specialPhoneCall).toBe(2); // SPECIALCALL_ROBBED
  page.once("dialog", (dialog) => dialog.accept());
  await page.locator("#save-file").setInputFiles(path);
  await expect(page.locator("#status")).toContainText("Backup restored");
  await page.reload();
  await page.locator("#rom-file").setInputFiles(romPath);
  await expect(page.locator("#status")).toContainText("saved session");
  const restored = await backup(page);
  expect(restored.state).toEqual(state);
});

test("the real Cherrygrove return scene battles the rival and commits its exit", async ({ page }) => {
  await start(page, "questRivalFixtureWorld");
  await drive(page); // a pending outdoor call may run before the encounter
  await step(page, "Right");
  const shown = await drive(page);
  expect(shown).toContain("CHIKORITA");
  expect(shown).toContain("???");
  await expect(page.locator("#battle")).toBeHidden();
  const { state } = await backup(page);
  expect(state.scenes["26:3"]).toBe(0);
  expect(state.pokedex.seen).toContain(152);
  expect(state.party[0].hp).toBe(state.party[0].stats[0]);
  expect(state.events).toContain(30);
});

test("the officer in Elm's lab names the rival through the naming field", async ({ page }) => {
  await start(page, "questLabFixtureWorld");
  await step(page, "Up");
  await expect(page.locator("#game-screen")).toHaveAttribute("data-map", "24:5");
  await drive(page);
  for (let y = 11; y > 5; y--) await step(page, "Up");
  const shown = await drive(page, "BLUE");
  expect(shown).toContain("RIVAL'S NAME?");
  expect(shown).toContain("BLUE");
  const { state } = await backup(page);
  expect(state.rivalName).toBe("BLUE");
  expect(state.scenes["24:5"]).toBe(2);
});