<template>
	<label class="timctyfi" :class="{ disabled, easing }">
		<div class="label"><slot name="label"></slot></div>
		<div v-adaptive-border class="body">
			<div class="container">
				<input
					ref="inputEl"
					type="range"
					:min="min"
					:max="max"
					:step="step"
					:list="id"
					:value="modelValue"
					:disabled="disabled"
					v-on:change="(x) => onChange(x)"
					@focus="tooltipShow"
					@blur="tooltipHide"
					@mouseenter="tooltipShow"
					@mouseleave="tooltipHide"
					@input="(x) => inputVal = x.target.value"
				/>
				<datalist 
					v-if="showTicks && steps"
					:id="id"
				>
					<option 
						v-for="i in steps + 1"
						:value="i"
						:label="i.toString()"
					></option>
				</datalist>
			</div>
		</div>
		<div class="caption"><slot name="caption"></slot></div>
	</label>
</template>

<script lang="ts" setup>
import { ref, computed, defineAsyncComponent } from "vue";
import * as os from "@/os";

const id = os.getUniqueId();

const props = withDefaults(
	defineProps<{
		modelValue: number;
		disabled?: boolean;
		min: number;
		max: number;
		step?: number;
		textConverter?: (value: number) => string;
		showTicks?: boolean;
		easing?: boolean;
	}>(),
	{
		step: 1,
		textConverter: (v) => v.toString(),
		easing: false,
	}
);

const inputEl = ref<HTMLElement>();
let inputVal = $ref(props.modelValue);

const emit = defineEmits<{
	(ev: "update:modelValue", value: number): void;
}>();

const steps = computed(() => {
	if (props.step) {
		return (props.max - props.min) / props.step;
	} else {
		return 0;
	}
});

function onChange(x) {
	emit("update:modelValue", inputVal);
}

const tooltipShowing = ref(false);
function tooltipShow() {
	tooltipShowing.value = true;
	os.popup(
		defineAsyncComponent(() => import("@/components/MkTooltip.vue")),
		{
			showing: tooltipShowing,
			text: computed(() => {
				return props.textConverter(inputVal);
			}),
			targetElement: inputEl,
		},
		{},
		"closed"
	);
}
function tooltipHide() {
	tooltipShowing.value = false;
}

</script>

<style lang="scss" scoped>
@use "sass:math";

.timctyfi {
	position: relative;

	> .label {
		font-size: 0.85em;
		padding: 0 0 8px 0;
		user-select: none;

		&:empty {
			display: none;
		}
	}

	> .caption {
		font-size: 0.85em;
		padding: 8px 0 0 0;
		color: var(--fgTransparentWeak);

		&:empty {
			display: none;
		}
	}

	$thumbHeight: 20px;
	$thumbWidth: 20px;

	> .body {
		padding: 10px 12px;
		background: var(--panel);
		border: solid 1px var(--panel);
		border-radius: 6px;

		> .container {
			position: relative;
			height: $thumbHeight;

			@mixin track {
				height: 3px;
				background: rgba(0, 0, 0, 0.1);
				border-radius: 999px;
			}

			@mixin fill {
				background-color: var(--accent);
			}

			@mixin thumb {
				width: $thumbWidth;
				height: $thumbHeight;
				background: var(--accent);
				border-radius: 999px;

				&:hover {
					background: var(--accentLighten);
				}
			}
			> input {
				width: 100%;
				background: none;

				&::-webkit-slider-runnable-track { @include track }
				&::-moz-range-track { @include track }
				&::-ms-track { @include track }

				&::-moz-range-progress { @include fill }
  			&::-ms-fill-lower { @include fill }

				&::-webkit-slider-thumb {
					margin-top: -6.5px;
					@include thumb 
				}
				&::-moz-range-thumb { @include thumb }
				&::-ms-thumb { @include thumb }
			}
		}
	}

	&.easing {
		> .body {
			> .container {
				> .track {
					> .highlight {
						transition: width 0.2s cubic-bezier(0, 0, 0, 1);
					}
				}

				> .thumb {
					transition: left 0.2s cubic-bezier(0, 0, 0, 1);
				}
			}
		}
	}
}
</style>
