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/*
* SPDX-FileCopyrightText: syuilo and misskey-project
* SPDX-License-Identifier: AGPL-3.0-only
*/
import { computed } from 'vue';
import type { Ref, ComputedRef } from 'vue';
export function getDateText(dateInstance: Date) {
const date = dateInstance.getDate();
const month = dateInstance.getMonth() + 1;
return `${month.toString()}/${date.toString()}`;
}
export type DateSeparetedTimelineItem<T> = {
id: string;
type: 'item';
data: T;
} | {
id: string;
type: 'date';
prev: Date;
prevText: string;
next: Date;
nextText: string;
};
export function makeDateSeparatedTimelineComputedRef<T extends { id: string; createdAt: string; }>(items: Ref<T[]> | ComputedRef<T[]>) {
return computed<DateSeparetedTimelineItem<T>[]>(() => {
const tl: DateSeparetedTimelineItem<T>[] = [];
for (let i = 0; i < items.value.length; i++) {
const item = items.value[i];
const date = new Date(item.createdAt);
const nextDate = items.value[i + 1] ? new Date(items.value[i + 1].createdAt) : null;
tl.push({
id: item.id,
type: 'item',
data: item,
});
if (
i !== items.value.length - 1 &&
nextDate != null && (
date.getFullYear() !== nextDate.getFullYear() ||
date.getMonth() !== nextDate.getMonth() ||
date.getDate() !== nextDate.getDate()
)
) {
tl.push({
id: `date-${item.id}`,
type: 'date',
prev: date,
prevText: getDateText(date),
next: nextDate,
nextText: getDateText(nextDate),
});
}
}
return tl;
});
}
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