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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .modal {
        display: block;
        position: fixed;
        z-index: 1;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        overflow: auto;
        background-color: rgb(0, 0, 0);
        background-color: rgba(0, 0, 0, 0.4);
      }

      .modal-content {
        background-color: #fefefe;
        margin: 0% auto;
        padding: 20px;
        border: 1px solid #888;
        width: 80%;
      }

      .close {
        color: #aaa;
        float: right;
        font-size: 28px;
        font-weight: bold;
      }

      .close:hover,
      .close:focus {
        color: black;
        text-decoration: none;
        cursor: pointer;
      }

      .inputs {
        display: flex;
        flex-direction: column;
      }

      .columns {
        width: 100%;
        display: flex;
        gap: 40px;
      }

      .columns > div:nth-child(2) {
        width: 80%;
      }

      textarea {
        width: 100%;
        height: 500px;
      }

      input {
        margin: 5px 0;
      }

      label {
        margin-right: 20px;
      }
    </style>
  </head>
  <body>
    <div class="columns">
      <div>
        <button>Open Modal</button>
        <div class="inputs">
          <div>
            <label>Height</label>
            <input placeholder="height" class="height" />
          </div>
          <div>
            <label>Width</label>
            <input placeholder="width" class="width" />
          </div>
        </div>
      </div>
      <div>
        <textarea
          class="molecule"
          placeholder="Insert a molecule here..."
        ></textarea>
      </div>
    </div>
    <script defer>
      const button = document.querySelector('button')
      const textarea = document.querySelector('.molecule')
      const width = document.querySelector('.width')
      const height = document.querySelector('.height')
      const modalContent = `
        <div class="modal-content">
            <span class="close">&times;</span>
            <iframe
            width="784"
            height="624"
            id="iframe"
            src="env_url"
            sandbox="allow-scripts allow-same-origin"
            ></iframe>
        </div>
      `
      let modal
      let closeIcon;
      let iframe;

      function closeModal() {
        closeIcon.removeEventListener('click', closeModal)
        modal.remove()
      }

      function createModal() {
        modal = document.createElement('div')
        modal.classList.add('modal')
        modal.innerHTML = modalContent
        document.body.appendChild(modal)

        closeIcon = document.querySelector('.close')
        iframe = document.getElementById('iframe')
        iframe.style.height = height.value + 'px'
        iframe.style.width = width.value + 'px'

        closeIcon.addEventListener('click', closeModal)
      }

      button.onclick = createModal
      window.onclick = function (event) {
        if (event.target == modal) {
            closeModal()
        }
      }

      window.addEventListener('message', (event) => {
        if (event.data.eventType === 'init') {
          iframe.contentWindow.ketcher.setMolecule(textarea.value)
        }
      })
    </script>
  </body>
</html>