import { expect, test, type Page } from "@playwright/test";
import { WORDS } from "../../src/content";

// 글자별 스타일 추측 대신 실제 Range 줄 상자를 비교해 어절 내부 분리를 검출한다.
async function copyLayout(page: Page, selector: string) {
  return page.locator(selector).evaluateAll((elements) =>
    elements.flatMap((element) => {
      const problems: string[] = [];
      const walker = document.createTreeWalker(element, NodeFilter.SHOW_TEXT);
      while (walker.nextNode()) {
        const node = walker.currentNode;
        for (const match of (node.textContent ?? "").matchAll(/[가-힣]+/g)) {
          const range = document.createRange();
          range.setStart(node, match.index!);
          range.setEnd(node, match.index! + match[0].length);
          if (new Set(Array.from(range.getClientRects(), (r) => r.y)).size > 1)
            problems.push(`split: ${match[0]}`);
        }
      }
      if (element.scrollWidth > element.clientWidth)
        problems.push(`overflow: ${element.textContent}`);
      return problems;
    }),
  );
}

test("리뷰: 한국어 모드·결과 어절은 320px와 360px에서도 갈라지거나 넘치지 않는다", async ({
  page,
}, info) => {
  for (const width of [320, 360]) {
    await page.setViewportSize({ width, height: 800 });
    await page.goto("/");
    expect.soft(await copyLayout(page, ".mode-option small")).toEqual([]);
    await page.screenshot({
      path: info.outputPath(`copy-${width}-home.png`),
      fullPage: true,
    });
    await page.getByRole("button", { name: "게임 시작 · 소리 듣기" }).click();
    await page.getByRole("button", { name: "문제 풀이 종료" }).click();
    expect
      .soft(
        await copyLayout(
          page,
          ".results-panel h2, .results-panel p, .stats span, .results-panel th, .results-panel td",
        ),
      )
      .toEqual([]);
    expect
      .soft(
        await page.evaluate(
          () => document.documentElement.scrollWidth <= innerWidth,
        ),
      )
      .toBe(true);
    await page.screenshot({
      path: info.outputPath(`copy-${width}-results.png`),
      fullPage: true,
    });
  }
});

test("리뷰: 실제 진행 막대는 현재 문항의 1/3·2/3·3/3을 채운다", async ({
  page,
}, info) => {
  let target = "";
  page.on("request", (r) => {
    const path = new URL(r.url()).pathname;
    if (path.startsWith("/audio/") && path !== "/audio/intro.wav")
      target = path;
  });
  await page.goto("/");
  await page.getByRole("radio", { name: "보기에서 선택" }).check();
  await page.getByRole("button", { name: "게임 시작 · 소리 듣기" }).click();
  for (let index = 0; index < 3; index++) {
    const bar = page.getByRole("progressbar");
    expect
      .soft(await bar.evaluate((el) => (el as HTMLProgressElement).position))
      .toBeCloseTo((index + 1) / 3);
    await expect
      .soft(bar)
      .toHaveAccessibleName("현재 문항 진행률", { timeout: 1000 });
    const png = await bar.screenshot({
      path: info.outputPath(`progress-${index + 1}.png`),
    });
    // 실제 그려진 중앙 행의 녹색 채움 비율까지 측정한다. DOM value만 맞는 빈 막대는 실패한다.
    const fill = await page.evaluate(async (base64) => {
      const bitmap = await createImageBitmap(
        new Blob([Uint8Array.from(atob(base64), (c) => c.charCodeAt(0))], {
          type: "image/png",
        }),
      );
      const canvas = document.createElement("canvas");
      canvas.width = bitmap.width;
      canvas.height = bitmap.height;
      const context = canvas.getContext("2d")!;
      context.drawImage(bitmap, 0, 0);
      const row = context.getImageData(
        0,
        Math.floor(canvas.height / 2),
        canvas.width,
        1,
      ).data;
      let green = 0;
      for (let x = 0; x < canvas.width; x++) {
        if (
          Math.abs(row[x * 4]! - 101) < 12 &&
          Math.abs(row[x * 4 + 1]! - 132) < 12 &&
          Math.abs(row[x * 4 + 2]! - 80) < 12
        )
          green++;
      }
      bitmap.close();
      return { pixels: green, width: canvas.width };
    }, png.toString("base64"));
    expect
      .soft(Math.abs(fill.pixels - (fill.width * (index + 1)) / 3))
      .toBeLessThanOrEqual(2);
    if (index) await page.getByRole("button", { name: /문장 듣기/ }).click();
    await expect(page.getByRole("group", { name: "답 선택" })).toBeVisible({
      timeout: 30000,
    });
    const answer = WORDS.find((w) => target.endsWith(`-${w.id}.wav`))!.answer;
    await page.getByRole("button", { name: new RegExp(answer) }).click();
    await page
      .getByRole("button", { name: index === 2 ? /결과 보기/ : /다음 문제/ })
      .click();
  }
  await page.screenshot({
    path: info.outputPath("normal-results.png"),
    fullPage: true,
  });
  expect(
    await copyLayout(page, ".results-panel h2, .results-panel p, .stats span"),
  ).toEqual([]);
});