// 기술 역량 원본 이미지를 웹 전송용 WebP로 변환합니다.
// 실행: node scripts/generate-capability-webp.mjs [파일명 일부] [--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 filters = process.argv.slice(2).filter((argument) => !argument.startsWith("--"));
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");
}

const assets = Array.from(sources, ([relativeSource, type]) => {
  const source = path.join(root, relativeSource);
  const target = path.join(root, optimizedPath(relativeSource));
  const sourceStat = fs.statSync(source);
  const targetStat = fs.existsSync(target) ? fs.statSync(target) : null;
  return { relativeSource, type, source, target, sourceStat, targetStat };
}).filter(({ relativeSource }) =>
  !filters.length || filters.some((filter) => relativeSource.includes(filter)));

if (!assets.length) {
  throw new Error(`일치하는 기술 역량 이미지가 없습니다: ${filters.join(", ")}`);
}

// 삭제된 결과물을 먼저 복구하고, 나머지는 데이터에 정의된 순서대로 처리합니다.
assets.sort((a, b) => Number(Boolean(a.targetStat)) - Number(Boolean(b.targetStat)));

const pending = assets.filter(({ sourceStat, targetStat }) =>
  force || !targetStat || targetStat.mtimeMs < sourceStat.mtimeMs);
let sourceBytes = assets.reduce((total, { sourceStat }) => total + sourceStat.size, 0);
let outputBytes = assets.reduce((total, asset) =>
  pending.includes(asset) ? total : total + asset.targetStat.size, 0);

for (const [index, { relativeSource, type, source, target }] of pending.entries()) {
  fs.mkdirSync(path.dirname(target), { recursive: true });
  console.log(`[${index + 1}/${pending.length}] ${relativeSource}`);

  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;
}

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