<template>
<MkContainer :naked="widgetProps.transparent" :show-header="widgetProps.showHeader" class="mkw-rss-ticker">
	<template #header><i class="ti ti-rss"></i>RSS</template>
	<template #func><button class="_button" @click="configure"><i class="ti ti-settings"></i></button></template>

	<div :class="$style.feed">
		<div v-if="fetching" :class="$style.loading">
			<MkEllipsis/>
		</div>
		<div v-else>
			<Transition :name="$style.change" mode="default" appear>
				<MarqueeText :key="key" :duration="widgetProps.duration" :reverse="widgetProps.reverse">
					<span v-for="item in items" :class="$style.item" :key="item.link">
						<a :class="$style.link" :href="item.link" rel="nofollow noopener" target="_blank" :title="item.title">{{ item.title }}</a><span :class="$style.divider"></span>
					</span>
				</MarqueeText>
			</Transition>
		</div>
	</div>
</MkContainer>
</template>

<script lang="ts" setup>
import { ref, watch, computed } from 'vue';
import { useWidgetPropsManager, Widget, WidgetComponentEmits, WidgetComponentExpose, WidgetComponentProps } from './widget';
import MarqueeText from '@/components/MkMarquee.vue';
import { GetFormResultType } from '@/scripts/form';
import MkContainer from '@/components/MkContainer.vue';
import { shuffle } from '@/scripts/shuffle';
import { url as base } from '@/config';
import { useInterval } from '@/scripts/use-interval';

const name = 'rssTicker';

const widgetPropsDef = {
	url: {
		type: 'string' as const,
		default: 'http://feeds.afpbb.com/rss/afpbb/afpbbnews',
	},
	shuffle: {
		type: 'boolean' as const,
		default: true,
	},
	refreshIntervalSec: {
		type: 'number' as const,
		default: 60,
	},
	maxEntries: {
		type: 'number' as const,
		default: 15,
	},
	duration: {
		type: 'range' as const,
		default: 70,
		step: 1,
		min: 5,
		max: 200,
	},
	reverse: {
		type: 'boolean' as const,
		default: false,
	},
	showHeader: {
		type: 'boolean' as const,
		default: false,
	},
	transparent: {
		type: 'boolean' as const,
		default: false,
	},
};

type WidgetProps = GetFormResultType<typeof widgetPropsDef>;

// 現時点ではvueの制限によりimportしたtypeをジェネリックに渡せない
//const props = defineProps<WidgetComponentProps<WidgetProps>>();
//const emit = defineEmits<WidgetComponentEmits<WidgetProps>>();
const props = defineProps<{ widget?: Widget<WidgetProps>; }>();
const emit = defineEmits<{ (ev: 'updateProps', props: WidgetProps); }>();

const { widgetProps, configure } = useWidgetPropsManager(name,
	widgetPropsDef,
	props,
	emit,
);

const rawItems = ref([]);
const items = computed(() => {
	const newItems = rawItems.value.slice(0, widgetProps.maxEntries)
	if (widgetProps.shuffle) {
		shuffle(newItems);
	}
	return newItems;
});
const fetching = ref(true);
const fetchEndpoint = computed(() => {
	const url = new URL('/api/fetch-rss', base);
	url.searchParams.set('url', widgetProps.url);
	return url;
});
let intervalClear = $ref<(() => void) | undefined>();

let key = $ref(0);

const tick = () => {
	if (document.visibilityState === 'hidden' && rawItems.value.length !== 0) return;

	window.fetch(fetchEndpoint.value, {})
	.then(res => res.json())
	.then(feed => {
		if (widgetProps.shuffle) {
			shuffle(feed.items);
		}
		rawItems.value = feed.items;
		fetching.value = false;
		key++;
	});
};

watch(() => fetchEndpoint, tick);
watch(() => widgetProps.refreshIntervalSec, () => {
	if (intervalClear) {
		intervalClear();
	}
	intervalClear = useInterval(tick, Math.max(10000, widgetProps.refreshIntervalSec * 1000), {
		immediate: true,
		afterMounted: true,
	});
}, { immediate: true });

defineExpose<WidgetComponentExpose>({
	name,
	configure,
	id: props.widget ? props.widget.id : null,
});
</script>

<style lang="scss" module>
.change {
	&:global(-enter-active),
	&:global(-leave-active) {
		position: absolute;
		top: 0;
		transition: all 1s ease;
	}
	&:global(-enter-from) {
		opacity: 0;
		transform: translateY(-100%);
	}
	&:global(-leave-to) {
		opacity: 0;
		transform: translateY(100%);
	}
}

.feed {
	--height: 42px;
	padding: 0;
	font-size: 0.9em;
	line-height: var(--height);
	height: var(--height);
	contain: strict;
}

.loading {
	text-align: center;
}

.item {
	display: inline-flex;
	align-items: center;
	vertical-align: bottom;
	color: var(--fg);
}

.divider {
	display: inline-block;
	width: 0.5px;
	height: 16px;
	margin: 0 1em;
	background: var(--divider);
}
</style>
