import fs from 'node:fs/promises'
import path from 'node:path'

import Link from 'next/link'

import styles from '~/styles/index.module.css'
import sharp from 'sharp'

const mimes = {
  jpg: 'image/jpeg',
  jpeg: 'image/jpeg',
  png: 'image/png',
  bmp: 'image/bmp',
  gif: 'image/gif'
}

export default async function Index() {
  const buttonDir = 'images/buttons/'
  const buttonFiles = (await fs.readdir(path.join(process.cwd(), buttonDir)).catch(() => {}) || [])
    .filter(buttonName => buttonName.match(/\.(png|gif|jpg|jpeg)$/))

  const buttonLinks = (await fs.readFile(path.join(process.cwd(), 'images/buttons/urls.txt'), {encoding: 'utf8'}).catch(() => {}) || '')
    .split('\n').filter(line => !!line)
    .map(line => line.match(/^([^:]+):\s+(.*)$/))
    .filter(match => !!match)
    .reduce((acc,[_, name, url]) => ({...acc, [name]: url}), {})

  const buttons = await Promise.all(buttonFiles.map(async buttonFile => {
    const origImageData = await fs.readFile(path.join(process.cwd(), buttonDir, buttonFile))
    let preview = null

    const metadata = await sharp(origImageData, {pages: -1}).metadata()

    // Generate preview if there's more than one frame
    if(metadata.pages > 1) {
      preview = await sharp(origImageData, {pages: 1})
        .png({quality: 80, force: true})
        .toBuffer()
    }

    return {
      name: buttonFile.split('.').slice(0, -1).join('.'),
      mime: mimes[buttonFile.split('.').at(-1)] || 'image/*',
      url: buttonLinks[buttonFile],
      data: origImageData.toString('base64'),
      preview: preview?.toString('base64')
    }
  }))

  const friendButtons = buttons.filter(button => button.name !== 'tempest')
  const ourButton = buttons.filter(button => button.name === 'tempest')[0]

  return (
    <>
      <main className="mainColumn card">
        <p>
          Hi, we're tempest!  We're a median plural
          system of six members, but most of the time you'll probably see us
          operating as one
        </p>

        <p>We like coding, VR, and making CG art</p>

        <h2>At a glance</h2>
        <div className={styles.glance}>
          <span className={styles.label}>Pronouns:</span>
          <span>they/it</span>

          <span className={styles.label}>Cohort:</span>
          <span>millenial</span>

          <span className={styles.label}>Orientation:</span>
          <span>ace . . . ish</span>

          <span className={styles.label}>Partners:</span>
          <span>several</span>

          <span className={styles.label}>Children:</span>
          <span>two</span>

          <span className={styles.label}>Capitalize name:</span>
          <span>not unless we're at work</span>
        </div>

        <p>
          <em>Note:</em> This is the information for our system in aggregate,
          for individual info see our <Link href="/about">about</Link> page
        </p>
      </main>
      {friendButtons.length > 0 && (
        <div className="mainColumn postscript">
          <h2>Friends and other neighbors:
            {ourButton && <a target="_blank" href={`data:${ourButton.mime};base64,${ourButton.data}`} className="asideLink" aria-label="Link back to us">
              <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 640 512"><path fill="currentcolor" d="M579.8 267.7c56.5-56.5 56.5-148 0-204.5c-50-50-128.8-56.5-186.3-15.4l-1.6 1.1c-14.4 10.3-17.7 30.3-7.4 44.6s30.3 17.7 44.6 7.4l1.6-1.1c32.1-22.9 76-19.3 103.8 8.6c31.5 31.5 31.5 82.5 0 114L422.3 334.8c-31.5 31.5-82.5 31.5-114 0c-27.9-27.9-31.5-71.8-8.6-103.8l1.1-1.6c10.3-14.4 6.9-34.4-7.4-44.6s-34.4-6.9-44.6 7.4l-1.1 1.6C206.5 251.2 213 330 263 380c56.5 56.5 148 56.5 204.5 0L579.8 267.7zM60.2 244.3c-56.5 56.5-56.5 148 0 204.5c50 50 128.8 56.5 186.3 15.4l1.6-1.1c14.4-10.3 17.7-30.3 7.4-44.6s-30.3-17.7-44.6-7.4l-1.6 1.1c-32.1 22.9-76 19.3-103.8-8.6C74 372 74 321 105.5 289.5L217.7 177.2c31.5-31.5 82.5-31.5 114 0c27.9 27.9 31.5 71.8 8.6 103.9l-1.1 1.6c-10.3 14.4-6.9 34.4 7.4 44.6s34.4 6.9 44.6-7.4l1.1-1.6C433.5 260.8 427 182 377 132c-56.5-56.5-148-56.5-204.5 0L60.2 244.3z"/></svg>
            </a>}
          </h2>
          <div className={styles.the88x31s}>
            {friendButtons.map(button => {
              const image = <img
                data-button-canonical
                alt={button.name}
                title={button.name}
                src={`data:${button.mime};base64,${button.data}`}
              />

              const preview = button.preview ? <img
                data-button-preview
                alt={button.name}
                title={button.name}
                src={`data:image/png;base64,${button.preview}`}
              /> : null

              if(button.url)
                return (
                  <a target="_blank" rel="noopener" key={button.name} href={button.url}>{image}{preview}</a>
                )
              else
                return (
                  <a key={button.name}>{image}{preview}</a>
                )
            })}
            <script type="text/javascript" dangerouslySetInnerHTML={{__html: `
              const buttons = document.currentScript.parentElement.querySelectorAll('a:has([data-button-preview])')

              // Slightly janky way of resetting GIF animations after they go back to the preview state
              buttons.forEach(button => button.addEventListener('mouseleave', () => {
                const image = button.querySelector('[data-button-canonical]')
                const src = image.getAttribute('src')
                image.setAttribute('src', '')
                setTimeout(() => {
                  image.setAttribute('src', src)
                }, 0)
              }))
            `}}/>
          </div>
        </div>
      )}
    </>
  )
}