<template>
	<div class="color-picker-container">
		<datalist :id="colorListID">
			<option v-for="defaultColor in defaultColors" :key="defaultColor" :value="defaultColor" />
		</datalist>
		
		<div class="picker">
			<input
				class="picker__input"
				type="color"
				v-model="color"
				:list="colorListID"
				:class="{'is-empty': isEmpty}"
			/>
			<svg class="picker__pattern" v-show="isEmpty" viewBox="0 0 22 22" fill="fff">
				<pattern id="checker" width="11" height="11" patternUnits="userSpaceOnUse" fill="FFF">
					<rect fill="#cccccc" x="0" width="5.5" height="5.5" y="0"></rect>
					<rect fill="#cccccc" x="5.5" width="5.5" height="5.5" y="5.5"></rect>
				</pattern>
				<rect width="22" height="22" fill="url(#checker)"></rect>
			</svg>
		</div>

		<x-button
			v-if="!isEmpty"
			:disabled="isEmpty"
			@click="reset"
			class="is-small ml-2"
			:shadow="false"
			variant="secondary"
		>
			{{ $t('input.resetColor') }}
		</x-button>
	</div>
</template>

<script setup lang="ts">
import {computed, ref, toRef, watch} from 'vue'
import {createRandomID} from '@/helpers/randomId'

const DEFAULT_COLORS = [
	'#1973ff',
	'#7F23FF',
	'#ff4136',
	'#ff851b',
	'#ffeb10',
	'#00db60',
]

const color = ref('')
const lastChangeTimeout = ref<ReturnType<typeof setTimeout> | null>(null)
const defaultColors = ref(DEFAULT_COLORS)
const colorListID = ref(createRandomID())

const props = defineProps({
	modelValue: {
		type: String,
		required: true,
	},
	menuPosition: {
		type: String,
		default: 'top',
	},
})

const emit = defineEmits(['update:modelValue'])

const modelValue = toRef(props, 'modelValue')
watch(
	modelValue,
	(newValue) => {
		color.value = newValue
	},
	{immediate: true},
)

watch(color, () => update())

const isEmpty = computed(() => color.value === '#000000' || color.value === '')

function update(force = false) {
	if(isEmpty.value && !force) {
		return
	}

	if (lastChangeTimeout.value !== null) {
		clearTimeout(lastChangeTimeout.value)
	}

	lastChangeTimeout.value = setTimeout(() => {
		emit('update:modelValue', color.value)
	}, 500)
}

function reset() {
	// FIXME: I havn't found a way to make it clear to the user the color war reset.
	//  Not sure if verte is capable of this - it does not show the change when setting this.color = ''
	color.value = ''
	update(true)
}
</script>

<style lang="scss" scoped>
.color-picker-container {
  display: flex;
  justify-content: center;
  align-items: center;

	// reset / see https://stackoverflow.com/a/11471224/15522256
	input[type="color"] {
		-webkit-appearance: none;
		border: none;
	}
	input[type="color"]::-webkit-color-swatch-wrapper {
		padding: 0;
	}
	input[type="color"]::-webkit-color-swatch {
		border: none;
	}

	$PICKER_SIZE: 24px;
	$BORDER_WIDTH: 1px;
	.picker {
		display: grid;
		width: $PICKER_SIZE;
		height: $PICKER_SIZE;
		overflow: hidden;
		border-radius: 100%;
		border: $BORDER_WIDTH solid var(--grey-300);
		box-shadow: $shadow;

		& > * {
			grid-row: 1;
			grid-column: 1;
		}
	}

	input.picker__input {
		padding: 0;
		width: $PICKER_SIZE - 2 * $BORDER_WIDTH;
		height: $PICKER_SIZE - 2 * $BORDER_WIDTH;
	}

	.picker__input.is-empty {
		opacity: 0;
	}
	
	.picker__pattern {
		pointer-events: none;
	}
}
</style>
