import { mkdirSync } from 'node:fs';
import { dirname } from 'node:path';
import { chromium } from 'playwright';

const targetUrl = withQaParams(process.env.PUBLIC_QA_URL ?? 'https://comtropy.synology.me/heros_web/');
const screenshotPath = process.env.PUBLIC_QA_SCREENSHOT ?? 'dist/public-deploy-qa.png';
const expectedQaVersion = process.env.PUBLIC_QA_VERSION;
const expectedTitle = '\uC0BC\uAD6D\uC9C0: \uC138 \uD615\uC81C\uC758 \uB9F9\uC138';
const relevantLogPattern = /asset|audio|cannot|failed|map|missing|portrait|sprite|story|texture|unit/i;

mkdirSync(dirname(screenshotPath), { recursive: true });

const browser = await chromium.launch({ headless: true });

try {
  const page = await browser.newPage({ viewport: { width: 1280, height: 720 } });
  const consoleMessages = [];
  const pageErrors = [];
  const requestFailures = [];
  page.on('console', (message) => {
    consoleMessages.push({ type: message.type(), text: message.text() });
  });
  page.on('pageerror', (error) => {
    pageErrors.push(error.message);
  });
  page.on('requestfailed', (request) => {
    requestFailures.push({
      url: request.url(),
      type: request.resourceType(),
      failure: request.failure()?.errorText ?? 'unknown'
    });
  });

  await page.goto(targetUrl, { waitUntil: 'domcontentloaded', timeout: 90000 });
  await page.waitForFunction(() => document.querySelector('canvas') !== null, undefined, { timeout: 90000 });
  await page.waitForFunction(() => {
    const canvas = document.querySelector('canvas');
    return Boolean(canvas && canvas.width >= 960 && canvas.height >= 540);
  }, undefined, { timeout: 90000 });
  await page.waitForTimeout(3000);
  await page.screenshot({ path: screenshotPath, fullPage: true });

  const state = await page.evaluate(() => {
    const canvas = document.querySelector('canvas');
    return {
      title: document.title,
      canvasCount: document.querySelectorAll('canvas').length,
      debugApiPresent: Boolean(window.__HEROS_DEBUG__),
      gameApiPresent: Boolean(window.__HEROS_GAME__),
      canvas: canvas
        ? {
            width: canvas.width,
            height: canvas.height,
            clientWidth: canvas.clientWidth,
            clientHeight: canvas.clientHeight,
            pixelProbe: sampleCanvasPixels(canvas)
          }
        : undefined
    };

    function sampleCanvasPixels(canvas) {
      const context = canvas.getContext('2d', { willReadFrequently: true });
      if (!context) {
        return { readable: false, sampleCount: 0, nonTransparentRatio: 0, distinctColorBuckets: 0 };
      }

      const stepX = Math.max(1, Math.floor(canvas.width / 64));
      const stepY = Math.max(1, Math.floor(canvas.height / 64));
      const colorBuckets = new Set();
      let sampleCount = 0;
      let nonTransparentCount = 0;

      for (let y = Math.floor(stepY / 2); y < canvas.height; y += stepY) {
        for (let x = Math.floor(stepX / 2); x < canvas.width; x += stepX) {
          const [r, g, b, a] = context.getImageData(x, y, 1, 1).data;
          sampleCount += 1;
          if (a > 8) {
            nonTransparentCount += 1;
          }
          colorBuckets.add(`${r >> 4},${g >> 4},${b >> 4},${a >> 5}`);
        }
      }

      return {
        readable: true,
        sampleCount,
        nonTransparentRatio: sampleCount > 0 ? nonTransparentCount / sampleCount : 0,
        distinctColorBuckets: colorBuckets.size
      };
    }
  });

  assert(state.title === expectedTitle, `Expected deployed page title "${expectedTitle}": ${JSON.stringify(state)}`);
  assert(state.canvasCount === 1, `Expected exactly one game canvas: ${JSON.stringify(state)}`);
  assert(state.debugApiPresent === false, `Expected public deploy to keep debug API disabled: ${JSON.stringify(state)}`);
  assert(state.gameApiPresent === false, `Expected public deploy to keep game handle disabled: ${JSON.stringify(state)}`);
  assert(state.canvas?.width >= 960 && state.canvas?.height >= 540, `Expected desktop-size game canvas: ${JSON.stringify(state)}`);
  assert(state.canvas?.pixelProbe?.readable === true, `Expected readable canvas pixels: ${JSON.stringify(state)}`);
  assert(state.canvas.pixelProbe.sampleCount >= 500, `Expected enough canvas pixel samples: ${JSON.stringify(state)}`);
  assert(state.canvas.pixelProbe.nonTransparentRatio > 0.5, `Expected non-empty canvas pixels: ${JSON.stringify(state)}`);
  assert(state.canvas.pixelProbe.distinctColorBuckets >= 12, `Expected visually varied canvas pixels: ${JSON.stringify(state)}`);

  const releaseManifest = await readReleaseManifest(targetUrl);
  assert(releaseManifest.app === 'heros_web', `Expected deployed release manifest app id: ${JSON.stringify(releaseManifest)}`);
  assert(typeof releaseManifest.commit === 'string' && releaseManifest.commit.length >= 7, `Expected deployed release manifest commit: ${JSON.stringify(releaseManifest)}`);
  assert(typeof releaseManifest.generatedAt === 'string' && releaseManifest.generatedAt.length > 0, `Expected deployed release manifest timestamp: ${JSON.stringify(releaseManifest)}`);
  if (expectedQaVersion) {
    assert(
      releaseManifest.qaVersion === expectedQaVersion,
      `Expected deployed release manifest qaVersion ${expectedQaVersion}: ${JSON.stringify(releaseManifest)}`
    );
  }

  const relevantLogs = consoleMessages.filter(
    (message) => message.type === 'error' || (isWarning(message.type) && relevantLogPattern.test(message.text))
  );
  const blockingRequestFailures = requestFailures.filter((request) => request.failure !== 'net::ERR_ABORTED');
  assert(relevantLogs.length === 0, `Unexpected public deploy console issues: ${JSON.stringify(relevantLogs, null, 2)}`);
  assert(pageErrors.length === 0, `Unexpected public deploy page errors: ${JSON.stringify(pageErrors, null, 2)}`);
  assert(blockingRequestFailures.length === 0, `Unexpected public deploy request failures: ${JSON.stringify(blockingRequestFailures, null, 2)}`);

  console.log(`Verified public deploy at ${targetUrl}`);
  console.log(`Verified release manifest ${releaseManifest.shortCommit ?? releaseManifest.commit} (${releaseManifest.qaVersion ?? 'no qaVersion'})`);
  console.log(`Captured ${screenshotPath}`);
} finally {
  await browser.close();
}

function withQaParams(url) {
  const parsed = new URL(url);
  parsed.searchParams.set('renderer', 'canvas');
  parsed.searchParams.set('v', process.env.PUBLIC_QA_VERSION ?? String(Date.now()));
  return parsed.toString();
}

function isWarning(type) {
  return type === 'warning' || type === 'warn';
}

async function readReleaseManifest(pageUrl) {
  const manifestUrl = new URL('release-manifest.json', pageUrl);
  manifestUrl.searchParams.set('v', expectedQaVersion ?? String(Date.now()));
  const response = await fetch(manifestUrl, { signal: AbortSignal.timeout(90000) });
  assert(response.ok, `Expected deployed release manifest at ${manifestUrl.href}: ${response.status} ${response.statusText}`);
  return response.json();
}

function assert(condition, message) {
  if (!condition) {
    throw new Error(message);
  }
}