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

const __dirname = dirname(fileURLToPath(import.meta.url))
const input = join(__dirname, '../src/assets/profile/avatar.png')

const { data, info } = await sharp(input)
  .ensureAlpha()
  .raw()
  .toBuffer({ resolveWithObject: true })

for (let i = 0; i < data.length; i += 4) {
  const r = data[i]
  const g = data[i + 1]
  const b = data[i + 2]
  const sum = r + g + b

  const isBlack = sum < 55
  const isNavy = b > r + 8 && b > g + 2 && sum < 140
  const isDarkBlueBg = b > 15 && r < 35 && g < 45 && b < 90 && sum < 100

  if (isBlack || isNavy || isDarkBlueBg) {
    data[i + 3] = 0
  }
}

const output = await sharp(data, {
  raw: { width: info.width, height: info.height, channels: 4 },
})
  .png()
  .toBuffer()

writeFileSync(input, output)
console.log('Done:', info.width, 'x', info.height)