// 기술 역량 원본 이미지를 웹 전송용 WebP로 변환합니다.
// 실행: node scripts/generate-capability-webp.mjs [--force]
import fs from "node:fs";
import path from "node:path";
import vm from "node:vm";
import { execFileSync } from "node:child_process";
import { fileURLToPath } from "node:url";

const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
const force = process.argv.includes("--force");
const context = { window: {} };
vm.runInNewContext(fs.readFileSync(path.join(root, "js", "capabilities-data.js"), "utf8"), context);

const sources = new Map();
for (const item of context.window.CAPABILITY_PROJECTS) {
  if (item.image) sources.set(item.image, "background");
  if (item.objectImage) sources.set(item.objectImage, "object");
  if (item.objectImageSecondary) sources.set(item.objectImageSecondary, "object");
}

function dimensions(source) {
  const output = execFileSync("sips", ["-g", "pixelWidth", "-g", "pixelHeight", source], {
    encoding: "utf8",
  });
  return {
    width: Number(output.match(/pixelWidth: (\d+)/)?.[1]),
    height: Number(output.match(/pixelHeight: (\d+)/)?.[1]),
  };
}

function optimizedPath(source) {
  return source
    .replace("assets/images/", "assets/images-webp/")
    .replace(/\.(?:png|jpe?g)$/i, ".webp");
}

let sourceBytes = 0;
let outputBytes = 0;
let generated = 0;

for (const [relativeSource, type] of sources) {
  const source = path.join(root, relativeSource);
  const target = path.join(root, optimizedPath(relativeSource));
  const sourceStat = fs.statSync(source);
  sourceBytes += sourceStat.size;
  fs.mkdirSync(path.dirname(target), { recursive: true });

  if (!force && fs.existsSync(target) && fs.statSync(target).mtimeMs >= sourceStat.mtimeMs) {
    outputBytes += fs.statSync(target).size;
    continue;
  }

  const { width, height } = dimensions(source);
  const maxWidth = type === "background" ? 2560 : 2400;
  const maxHeight = type === "background" ? 1800 : 2400;
  const scale = Math.min(1, maxWidth / width, maxHeight / height);
  const args = ["-quiet", "-mt", "-m", "6", "-q", type === "background" ? "80" : "86"];
  if (type === "background") args.push("-sharp_yuv");
  else args.push("-alpha_q", "100", "-exact");
  if (scale < 1) args.push("-resize", String(Math.round(width * scale)), String(Math.round(height * scale)));
  args.push(source, "-o", target);
  execFileSync("cwebp", args, { stdio: "inherit" });
  outputBytes += fs.statSync(target).size;
  generated += 1;
}

const savedPercent = Math.round((1 - outputBytes / sourceBytes) * 100);
console.log(
  `${generated ? `Generated ${generated}` : "Checked"} WebP assets: ` +
  `${(sourceBytes / 1048576).toFixed(1)}MB -> ${(outputBytes / 1048576).toFixed(1)}MB (${savedPercent}% reduction)`,
);