#!/bin/env node
/* eslint-env es6 */

const sharp = require('sharp')
const fs = require('node:fs')
const path = require('node:path')

{
  // Legacy avatars generation
  const inputDir = './assets/images/avatars/legacy'
  const outputDir = './dist/server/avatars/legacy'
  fs.mkdirSync(outputDir, { recursive: true })
  const backgrounds = [
    '#ffffff',
    '#000000',
    '#ff0000',
    '#00ff00',
    '#0000ff',
    '#808000',
    '#ffff00',
    '#008000',
    '#008080',
    '#00ffff',
    '#000080',
    '#800080',
    '#ff00ff'
  ]
  const count = 10

  for (let i = 1; i <= count; i++) {
    const inputFile = path.join(inputDir, i + '.svg')

    for (let j = 0; j < backgrounds.length; j++) {
      const out = i + (count * j)
      const background = backgrounds[j]
      sharp(inputFile).flatten({background}).resize(120, 120).jpeg({quality: 95, mozjpeg: true}).toFile(path.join(outputDir, out.toString() + '.jpg'))
    }
  }

  // Moderation bot avatar: for now taking image 2, and applying a grey background.
  {
    const i = 2
    const inputFile = path.join(inputDir, i + '.svg')

    const background = '#858da0'
    const outputDir = './dist/server/bot_avatars/legacy'
    fs.mkdirSync(outputDir, { recursive: true })
    const out = 1
    sharp(inputFile).flatten({background}).resize(120, 120).jpeg({quality: 95, mozjpeg: true}).toFile(path.join(outputDir, out.toString() + '.jpg'))
  }
}

{
  // 2024 avatars generation

  async function generate () {
    const partsDef = {
      // Available parts:
      // Note: some part files are empty, so that David's generator don't always add every part.
      // But this make my algorithm generate a lot of avatars that have no part other that the body and the yes.
      // So i don't include all empty files
      'sepia': {
        body: 25,
        pattern: 14, // 12 to 20 are empty
        mouth: 10,
        eyes: 10,
        accessories: 17, // 14 to 20 are empty
        misc: 16, // 15 to 20 are empty
        hat: 20 // 13 to 20 are empty
      },
      'cat': {
        body: 15,
        fur: 10,
        eyes: 15,
        mouth: 10,
        accessorie: 20 // 17 to 20 are empty
      }
    }

    for (const part in partsDef) {
      const parts = partsDef[part]

      const inputDir = path.join('./assets/images/avatars/', part)
      const outputDir = path.join('./dist/server/avatars/', part)
      fs.mkdirSync(outputDir, { recursive: true })

      function computeFilename (part, count) {
        let a = (1 + (count % parts[part])).toString()
        if (a.length < 2) { a = '0' + a}

        return path.join(
          inputDir,
          part + '_' + a + '.png'
        )
      }
      // We can't generate all combinations! It would make 400 000 000 files!
      // So we arbitrary pick some combinations, using some modulus
      const nb = 200 // number of avatars to generate

      for (let i = 0; i < nb; i++) {
        const ouputFile = path.join(
          outputDir,
          i.toString() + '.png'
        )
        if (await fs.existsSync(ouputFile)) {
          console.log(`Skipping ${ouputFile}, file already exists`)
          continue
        }

        const bodyFile = computeFilename('body', i)

        // We just have to combinate different parts into one file, then output at the wanted size.
        const composites = []
        let j = 0
        for (const part of Object.keys(parts).filter(p => p !== 'body')) {
          j++ // introduce an offset so we don't get all empty parts at the same time
          composites.push({
            input: computeFilename(part, i + (j * 7))
          })
        }

        const buff = await sharp(bodyFile)
          .composite(composites)
          .toBuffer()

        await sharp(buff)
          .resize(60, 60)
          .png({
            compressionLevel: 9,
            palette: true
          })
          .toFile(ouputFile)
      }
    }

    {
      // Moderation bot avatar: choosing some parts, and turning it so he is facing left.
      const inputDir = path.join('./assets/images/avatars/', 'sepia')
      const botOutputDir = './dist/server/bot_avatars/sepia/'
      fs.mkdirSync(botOutputDir, { recursive: true })
      const buff = await sharp(path.join(inputDir, 'body_20.png'))
        .composite([
          { input: path.join(inputDir, 'pattern_01.png') },
          { input: path.join(inputDir, 'mouth_01.png') },
          { input: path.join(inputDir, 'eyes_01.png') },
          { input: path.join(inputDir, 'misc_05.png') },
          { input: path.join(inputDir, 'hat_07.png') }
        ])
        .toBuffer()

      await sharp(buff)
        .flop() // horizontal mirror
        .resize(60, 60)
        .png({
          compressionLevel: 9,
          palette: true
        })
        .toFile(path.join(botOutputDir, '1.png'))
    }

    {
      // Moderation bot avatar: choosing some parts, and turning it so he is facing left.
      const inputDir = path.join('./assets/images/avatars/', 'cat')
      const botOutputDir = './dist/server/bot_avatars/cat/'
      fs.mkdirSync(botOutputDir, { recursive: true })
      const buff = await sharp(path.join(inputDir, 'body_04.png'))
        .composite([
          { input: path.join(inputDir, 'mouth_02.png') },
          { input: path.join(inputDir, 'eyes_11.png') },
          { input: path.join(inputDir, 'fur_02.png') },
          { input: path.join(inputDir, 'accessorie_03.png') }
        ])
        .toBuffer()

      await sharp(buff)
        .flop() // horizontal mirror
        .resize(60, 60)
        .png({
          compressionLevel: 9,
          palette: true
        })
        .toFile(path.join(botOutputDir, '1.png'))
    }
  }

  generate().then(
    () => {
      console.log('Done.')
    },
    (err) => {
      console.error(err)
    }
  )
}