<div id="app" class="font-sans text-black bg-grey-lighter px-8 py-8 min-h-screen">
  <div class="max-w-sm w-full mx-auto">
      <tags-input v-model="tags"></tags-input>
    </div>
  </div>
</div>

.tags-input {
  display: flex;
  flex-wrap: wrap;
  background-color: #fff;
  border-width: 1px;
  border-radius: .25rem;
  padding-left: .5rem;
  padding-right: 1rem;
  padding-top: .5rem;
  padding-bottom: .25rem;
}

.tags-input-tag {
  display: inline-flex;
  line-height: 1;
  align-items: center;
  font-size: .875rem;
  background-color: #bcdefa;
  color: #1c3d5a;
  border-radius: .25rem;
  user-select: none;
  padding: .25rem;
  margin-right: .5rem;
  margin-bottom: .25rem;
}

.tags-input-tag:last-of-type {
  margin-right: 0;
}

.tags-input-remove {
  color: #2779bd;
  font-size: 1.125rem;
  line-height: 1;
}

.tags-input-remove:first-child {
  margin-right: .25rem;
}

.tags-input-remove:last-child {
  margin-left: .25rem;
}

.tags-input-remove:focus {
  outline: 0;
}

.tags-input-text {
  flex: 1;
  outline: 0;
  padding-top: .25rem;
  padding-bottom: .25rem;
  margin-left: .5rem;
  margin-bottom: .25rem;
  min-width: 10rem;
}

.text-input {
  background-color: #fff;
  border-width: 1px;
  border-radius: .25rem;
  padding-left: 1rem;
  padding-right: 1rem;
  padding-top: .5rem;
  padding-bottom: .5rem;
  width: 100%;
}

.text-input:focus {
  outline: 0;
}

.btn {
  font-weight: 600;
  border-radius: .25rem;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
  padding-top: .5rem;
  padding-bottom: .5rem;
}

.btn-primary {
  color: #fff;
  background-color: #6574cd;
}

.btn-primary:hover {
  background-color: #7886d7;
}

.py-16 {
  padding-top: 4rem;
  padding-bottom: 4rem;
}

Vue.component('tags-input', {
  template: `
    <div class="p-4 rounded border bg-white">
      <div class="flex"> 
        <input class="text-input flex-1 mr-2" placeholder="New tag"
          @keydown.enter.prevent="addTag"
          v-model="newTag"
        >
        <button type="button" class="btn btn-primary"
          @click="addTag"
        >
          Add
        </button>
      </div>

      <ul v-show="value.length > 0" class="mt-4 pl-6">
        <li v-for="tag in value" class="mb-2">
          <span class="mr-2">{{ tag }}</span>
          <button class="text-grey-dark hover:text-grey-darkest underline text-sm" @click="removeTag(tag)">Remove</button>
        </li>
      </ul>
    </div>
  `,
  props: ['value'],
  data() {
    return {
      newTag: '',
    }
  },
  methods: {
    addTag() {
      if (this.newTag.trim().length === 0 || this.value.includes(this.newTag.trim())) {
        return
      }
      this.$emit('input', [...this.value, this.newTag.trim()])
      this.newTag = ''
    },
    removeTag(tag) {
      this.$emit('input', this.value.filter(t => t !== tag))
    },
  },
})

new Vue({
  el: '#app',
  data: {
    tags: [
      'Testing',
      'Design',
    ],
  },
});