<template>
  <button v-if="!confirming" :disabled="disabled" type="button" @click="onClick" class="ui-dropdown-button" :class="{ 'has-icon': icon, 'is-active': selected, 'is-multiline': multiline }">
    <ui-icon v-if="icon" :symbol="icon" class="ui-dropdown-button-icon" />
    <span><ui-localize :value="label" /><span v-if="false && confirm && !confirming"> &hellip;</span><span v-if="false && confirming">?</span></span>  
    <ui-icon v-if="selected" symbol="fth-check" class="ui-dropdown-button-selected" />
    <i v-if="loading" class="ui-dropdown-button-progress"></i>
  </button>
  <div v-if="confirming" class="ui-dropdown-button-confirmation">
    <ui-icon v-if="icon" :symbol="icon" class="ui-dropdown-button-icon" />
    <ui-localize :value="label" />
    <ui-button type="small light" icon="fth-x" title="Cancel" @click="confirming=false" />
    <ui-button :type="negative ? 'small danger' : 'small primary'" icon="fth-check" title="OK" @click="onClick($event, true)" />
  </div>
</template>


<script>
  export default {
    name: 'uiDropdownButton',

    props: {
      value: {
        default: null
      },
      multiline: {
        type: Boolean,
        default: false
      },
      label: {
        type: String,
        required: true
      },
      icon: {
        type: String
      },
      selected: {
        type: Boolean,
        default: false
      },
      confirm: {
        type: Boolean,
        default: false
      },
      disabled: {
        type: Boolean,
        default: false
      },
      negative: {
        type: Boolean,
        default: false
      },
      prevent: {
        type: Boolean,
        default: false
      }
    },

    data: () => ({
      dropdown: null,
      loading: false,
      confirming: false
    }),

    mounted ()
    {
      // find parent dropdown so we can pass it on item click
      let current = this;
      do
      {
        if (current.$options.name === 'uiDropdown')
        {
          this.dropdown = current;
          break;
        }
      }
      while (current = current.$parent);

      if (!this.dropdown)
      {
        console.warn('ui-dropdown-button: Could not find parent <ui-dropdown />');
      }
    },

    methods: {

      onClick(e, confirmed)
      {
        var instance = this;

        if (!this.loading && !this.disabled)
        {
          if (this.confirm && !confirmed)
          {
            this.confirming = true;
            //var confirmed = window.confirm('confirm?');
            return;
          }
          else
          {
            this.confirming = false;
          }

          if (!this.prevent && this.dropdown)
          {
            this.dropdown.hide();
          }

          this.$emit('click', this.value, {
            dropdown: this.dropdown,
            hide()
            {
              if (this.dropdown)
              {
                this.dropdown.hide();
              }
              instance.$emit('hide');
            },
            loading(isLoading)
            {
              instance.loading = isLoading;
            }
          });
        }
      }
    }
  }
</script>


<style lang="scss">
  button.ui-dropdown-button
  {
    display: grid;
    width: 100%;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 6px;
    align-items: center;
    font-size: var(--font-size);
    font-weight: 500;
    padding: 0 16px;
    height: 48px;
    color: var(--color-text);
    border-radius: var(--radius);
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
    max-width: 100%;

    &.has-icon
    {
      grid-template-columns: 30px minmax(0, 1fr) auto;

      &:not([disabled]):hover .ui-dropdown-button-icon
      {
        color: var(--color-text);
      }
    }

    &.has-icon.is-negative:not([disabled]):hover .ui-dropdown-button-icon
    {
      color: var(--color-accent-error);
    }

    &.is-multiline
    {
      white-space: normal;
      overflow: visible;
    }

    &:not([disabled]):hover, &.is-active, &:focus
    {
      background: var(--color-dropdown-selected);
      color: var(--color-text);
      //font-weight: 700;

      .ui-dropdown-list-item-icon
      {
        color: var(--color-text);
      }
    }

    &.is-active
    {
      font-weight: 700;
    }

    &.is-active .ui-dropdown-button-icon
    {
      color: var(--color-text);
    }

    &[disabled]
    {
      color: var(--color-text-dim);
      cursor: default;
      pointer-events: none;

      .ui-dropdown-list-item-icon,
      .ui-dropdown-button-icon
      {
        color: var(--color-text-dim);
      }
    }

    & + .ui-dropdown-button
    {
      margin-top: 4px;
    }
  }

  .ui-dropdown-button-icon
  {
    font-size: 18px;
    line-height: 1;
    font-weight: 400;
    position: relative;
    top: -1px;
    color: var(--color-text);
  }

  .ui-dropdown-button-progress
  {   
    width: 16px;
    height: 16px;
    z-index: 2;
    border-radius: 40px;
    border: 2px solid transparent;
    border-left-color: var(--color-text);
    opacity: 1;
    will-change: transform;
    animation: rotating .5s linear infinite;
    transition: opacity .25s ease;
  }

  .ui-dropdown-button-confirmation
  {
    display: grid;
    flex-grow: 0;
    width: 100%;
    grid-template-columns: 30px minmax(0, 1fr) auto auto;
    gap: 6px;
    align-items: center;
    font-size: var(--font-size);
    padding: 0 6px 0 16px;
    height: 48px;
    color: var(--color-text);
    border-radius: var(--radius);
    white-space: nowrap;
    text-overflow: ellipsis;
    overflow: hidden;
    max-width: 300px;

    .ui-button + .ui-button
    {
      margin-left: 2px;
    }

    .ui-button
    {
      width: 40px;
    }
  }

  @keyframes rotating
  {
    from
    {
      -webkit-transform: rotate(0);
      transform: rotate(0)
    }
    to
    {
      -webkit-transform: rotate(1turn);
      transform: rotate(1turn)
    }
  }
</style>