// scripts/generate-icons.mjs
// build/icon.svg → build/icon.png(1024) + build/icon.ico(멀티사이즈)
// 사용: node apps/desktop/scripts/generate-icons.mjs
// 의존: sharp (모노레포 루트 node_modules), Pillow는 불필요(ico도 sharp 산출 PNG로 조립)

import sharp from 'sharp'
import { writeFileSync } from 'node:fs'
import { fileURLToPath } from 'node:url'
import { dirname, join } from 'node:path'

const buildDir = join(dirname(fileURLToPath(import.meta.url)), '..', 'build')
const SVG = join(buildDir, 'icon.svg')

/** ICO 컨테이너 조립 — PNG 임베드 방식 (Vista+ 표준, 모든 현대 Windows 지원) */
function buildIco(pngs) {
  const count = pngs.length
  const header = Buffer.alloc(6)
  header.writeUInt16LE(0, 0) // reserved
  header.writeUInt16LE(1, 2) // type: icon
  header.writeUInt16LE(count, 4)

  const entries = []
  let offset = 6 + 16 * count
  for (const { size, buf } of pngs) {
    const e = Buffer.alloc(16)
    e.writeUInt8(size >= 256 ? 0 : size, 0) // width (0=256)
    e.writeUInt8(size >= 256 ? 0 : size, 1) // height
    e.writeUInt8(0, 2) // palette
    e.writeUInt8(0, 3) // reserved
    e.writeUInt16LE(1, 4) // planes
    e.writeUInt16LE(32, 6) // bpp
    e.writeUInt32LE(buf.length, 8)
    e.writeUInt32LE(offset, 12)
    entries.push(e)
    offset += buf.length
  }
  return Buffer.concat([header, ...entries, ...pngs.map((p) => p.buf)])
}

async function render(size) {
  return sharp(SVG, { density: (72 * size) / 1024 })
    .resize(size, size)
    .png()
    .toBuffer()
}

// 1) 마스터 PNG (electron-builder가 mac icns/linux 아이콘 자동 생성에 사용)
writeFileSync(join(buildDir, 'icon.png'), await render(1024))
console.log('build/icon.png (1024)')

// 2) Windows ICO — 표준 사이즈 세트
const icoSizes = [256, 128, 64, 48, 32, 16]
const pngs = []
for (const size of icoSizes) {
  pngs.push({ size, buf: await render(size) })
}
writeFileSync(join(buildDir, 'icon.ico'), buildIco(pngs))
console.log(`build/icon.ico (${icoSizes.join('/')})`)