let pl

function importPebblisp() {
  if (pl) {
    return
  }
  pl = () => {}
  return import('./pebblisp.js')
    .then(async mod => await mod.default())
    .then(async module =>
      pl = function pl(code) {
        return module.ccall('run', 'string', ['string'], [code])
      }
    )
}

class PlConsole extends HTMLElement {
  constructor() {
    super()
    this.codeHistory = `
(if (= 4 (+ 2 2))
  "Math still works!"
  "Uh-oh...")

> Math still works!`
  }

  input(e) {
    e.preventDefault()
  }

  connectedCallback() {
    const shadow = this.attachShadow({ mode: 'closed' })

    shadow.innerHTML = `
      <script>
        window.pl = function pl(code) {
          return Module.ccall('run', 'string', ['string'], [code])
        }
      </script>
      <style>
        .loadable {
          transition: opacity, display;
          transition-duration: 2s;
          transition-timing-function: ease-in;
          opacity: 1;
        }
        #pebblisp-console.unloaded .loadable {
          opacity: 0;
          cursor: pointer;
          user-select: none;
          pointer-events: none;
        }
        #pebblisp-console {
          width: calc(min(500px, 90%));
          height: 400px;
          display: flex;
          flex-direction: column;
          justify-content: end;
          background-color: black;
          color: white;
          padding: 1em;
          font-size: 115%;
          border-radius: 6px;
          position: relative;
        }
        @media only screen and (max-width: 600px) {
          #pebblisp-console {
            width: calc(min(500px, 105%));
            margin-left: -20px;
            margin-right: -20px;
            font-size: 75%;
          }
        }

        #pebblisp-output {
          text-align: left;
          overflow-y: scroll;
          white-space: pre-wrap;
          word-wrap: break-word;
          margin-top: 0;
        }

        .pebblisp-repl-input {
          font-family: monospace;
          margin: 0;
          padding: 3px;
          border-width: 0;
          outline: #555 solid 1px;
          width: 98%;
          background-color: #2b2a33;
          color: #eee;
        }

        .pebblisp-repl-input:focus {
          outline: #aaa solid 1px;
        }

        #pebblisp-console-preload {
          opacity: 0;
          height: 100%;
          width: 100%;
          text-align: center;
          user-select: none;
          cursor: pointer;
          display: flex;
          flex-direction: column;
          justify-content: center;
          position: absolute;
          top: 0;
          left: 0;
          transition: opacity 1s;
          text-shadow: -1px 2px 2px #FFFFFF77;
        }
        #pebblisp-console-preload:hover {
          /*text-shadow: -1px 2px 2px white;*/
          animation: 1s infinite jumpy-text steps(5, end);
        }
        #pebblisp-console.unloaded #pebblisp-console-preload {
          opacity: 1;
        }
        @keyframes jumpy-text {
          0% {
            text-shadow: -1px 2px 2px #FFFFFF77;
          }
          20% {
            text-shadow: 1px 1px 2px #FFFFFF77;
          }
          40% {
            text-shadow: 0px 3px 2px #FFFFFF77;
          }
          60% {
            text-shadow: -2px 0px 2px #FFFFFF77;
          }
          80% {
            text-shadow: 0px -3px 2px #FFFFFF77;
          }
        }
      </style>
      <div id="pebblisp-console" class="unloaded">
        <div id="pebblisp-console-preload">
          <div>Click to load the Pebblisp REPL (&lt; 0.5mB)</div>
        </div>
        <pre id="pebblisp-output" class="loadable">${this.codeHistory}</pre>
        <form id='repl-form' class="loadable">
          <input name="input" type="text" class="pebblisp-repl-input loadable">
        </form>
      </div>
    `
    const consoleNode = shadow.getElementById('pebblisp-console')
    const preloadMessage = shadow.getElementById('pebblisp-console-preload')
    const replForm = shadow.getElementById('repl-form')

    preloadMessage.addEventListener('click', e => {
      setTimeout(() => preloadMessage.remove(), 1000)
      importPebblisp().then(() => {
        consoleNode.classList.remove('unloaded')
      })
    })

    replForm.addEventListener('submit', e => {
      e.preventDefault()
      const input = e.target.input.value
      e.target.input.value = ''
      const result = pl(input)
      this.codeHistory += `

${input}
> ${result}`
      const output = shadow.getElementById('pebblisp-output')
      output.innerText = this.codeHistory
      output.scrollTop = output.scrollHeight
    })
  }
}


customElements.define("pebblisp-console", PlConsole);

document.addEventListener('DOMContentLoaded', () => {
  const element = document.getElementById('user-content-pebblisp-console-placeholder')
  element?.replaceWith(document.createElement('pebblisp-console'))
})