#!/usr/bin/env node
// Builds a side-by-side of the original photo and the scene, for the fidelity check. Local, no API.
// Usage: node scripts/compare.mjs --input original.jpg --scene scene.jpg --output compare.jpg
// Needs the `sharp` package. Look at the result: shape, colour, label and logo must match.
let sharp
try {
  sharp = (await import('sharp')).default
} catch {
  console.error('This script needs the sharp package. Run `npm install sharp` in the Skill folder (Node 20.9 or newer).')
  process.exit(1)
}

const usage = 'Usage: node scripts/compare.mjs --input original.jpg --scene scene.jpg --output compare.jpg'
const allowed = new Set(['input', 'scene', 'output'])
const options = {}
const args = process.argv.slice(2)
for (let index = 0; index < args.length; index += 1) {
  const key = args[index]
  if (!key.startsWith('--') || !allowed.has(key.slice(2))) {
    console.error(`Unknown argument: ${key}`)
    console.error(usage)
    process.exit(1)
  }
  const value = args[index + 1]
  if (value === undefined || value.startsWith('--')) {
    console.error(`${key} needs a value.`)
    console.error(usage)
    process.exit(1)
  }
  options[key.slice(2)] = value
  index += 1
}
if (!options.input || !options.scene || !options.output) {
  console.error('Usage: node scripts/compare.mjs --input original.jpg --scene scene.jpg --output compare.jpg')
  process.exit(1)
}
const height = 1200
const [left, right] = await Promise.all([options.input, options.scene].map((file) => sharp(file).rotate().resize({ height }).jpeg({ quality: 90 }).toBuffer({ resolveWithObject: true })))
await sharp({ create: { width: left.info.width + right.info.width + 24, height, channels: 3, background: '#ffffff' } })
  .composite([{ input: left.data, left: 0, top: 0 }, { input: right.data, left: left.info.width + 24, top: 0 }])
  .jpeg({ quality: 90 })
  .toFile(options.output)
console.log(`${options.output}: original on the left, scene on the right`)