<template>
  <div class="ant-color-predefine">
    <div class="ant-color-predefine__colors">
      <div
        v-for="(item, index) in rgbaColors"
        :key="colors[index]"
        :class="{ selected: item.selected, 'is-alpha': item._alpha < 100 }"
        class="ant-color-predefine__color-selector"
        @click="handleSelect(index)"
      >
        <div :style="{ backgroundColor: item.value }"></div>
      </div>
    </div>
  </div>
</template>

<script lang="ts">
  import { defineComponent, ref, watch, watchEffect } from 'vue';
  import Color from '../lib/color';
  import { useOptions } from '../useOptions';

  import type { PropType } from 'vue';

  export default defineComponent({
    name: 'PreDefine',
    props: {
      colors: {
        type: Array,
        required: true,
      },
      color: {
        type: Object as PropType<Color>,
        required: true,
      },
    },
    setup(props) {
      const currentColor: any = useOptions()?.currentColor;

      // data
      const rgbaColors = ref(parseColors(props.colors, props.color));

      // watch
      watch(
        () => currentColor.value,
        (val) => {
          const color = new Color();
          color.fromString(val);

          rgbaColors.value.forEach((item) => {
            item.selected = color.compare(item);
          });
        }
      );
      watchEffect(() => {
        rgbaColors.value = parseColors(props.colors, props.color);
      });

      // methods
      function handleSelect(index) {
        props.color.fromString(props.colors[index]);
      }
      function parseColors(colors, color) {
        return colors.map((value) => {
          const c = new Color();
          c.enableAlpha = true;
          c.format = 'rgba';
          c.fromString(value);
          c.selected = c.value === color.value;
          return c;
        });
      }

      return {
        rgbaColors,
        handleSelect,
      };
    },
  });
</script>

<style lang="less" scoped>
  .ant-color-predefine {
    display: flex;
    width: 280px;
    margin-top: 8px;
    font-size: 12px;

    .ant-color-predefine__colors {
      display: flex;
      flex: 1;
      flex-wrap: wrap;
    }

    .ant-color-predefine__color-selector {
      width: 20px;
      height: 20px;
      margin: 0 0 8px 8px;
      border-radius: 4px;
      cursor: pointer;

      &:nth-child(10n + 1) {
        margin-left: 0;
      }

      > div {
        display: flex;
        height: 100%;
        border-radius: 3px;
      }

      &.selected {
        box-shadow: 0 0 3px 2px #40a9ff;
      }
    }
  }
</style>
