blog/src/components/control/Pagination.astro

---
import type { Page } from "astro";
import { Icon } from 'astro-icon/components';
interface Props {
    page: Page;
    class?: string;
}

const {page} = Astro.props;

const HIDDEN = -1;

const className = Astro.props.class;
import Button from "./Button.astro";

const ADJ_DIST = 2;
const VISIBLE = ADJ_DIST * 2 + 1;

// for test
let count = 1;
let l = page.currentPage, r = page.currentPage;
while (0 < l - 1 && r + 1 <= page.lastPage && count + 2 <= VISIBLE) {
    count += 2;
    l--;
    r++;
}
while (0 < l - 1 && count < VISIBLE) {
    count++;
    l--;
}
while (r + 1 <= page.lastPage && count < VISIBLE) {
    count++;
    r++;
}

let pages: number[] = [];
if (l > 1)
    pages.push(1);
if (l == 3)
    pages.push(2);
if (l > 3)
    pages.push(HIDDEN);
for (let i = l; i <= r; i++)
    pages.push(i);
if (r < page.lastPage - 2)
    pages.push(HIDDEN);
if (r == page.lastPage - 2)
    pages.push(page.lastPage - 1);
if (r < page.lastPage)
    pages.push(page.lastPage);

const parts: string[] = page.url.current.split('/');
const commonUrl: string = parts.slice(0, -1).join('/') + '/';
---

<div class:list={[className, "flex flex-row gap-3 justify-center"]}>
    <a href={page.url.prev}>
        <Button isIcon card iconName="material-symbols:chevron-left-rounded" class:list={["text-[var(--primary)] rounded-lg", {"active:scale-90": page.url.prev != undefined}]} iconSize={28}
                disabled = {page.url.prev == undefined}
        ></Button>
    </a>
    <div class="bg-[var(--card-bg)] flex flex-row rounded-lg items-center text-neutral-700 dark:text-neutral-300 font-bold">
        {pages.map((p) => {
            if (p == HIDDEN)
                return <Icon name="material-symbols:more-horiz" class="mx-1"/>;
            if (p == page.currentPage)
                return <div class="h-[44px] w-[44px] rounded-lg bg-[var(--primary)] flex items-center justify-center
                    font-bold text-white dark:text-black/70"
                >
                    {p}
                </div>
            return <a href={commonUrl + p}>
                <Button card iconName="material-symbols:chevron-left-rounded" class="rounded-lg active:scale-[0.85]" height="44px" width="44px">
                    {p}
                </Button>
            </a>
        })}
    </div>
    <a href={page.url.next}>
        <Button isIcon card iconName="material-symbols:chevron-right-rounded" class:list={["text-[var(--primary)] rounded-lg", {"active:scale-90": page.url.next != undefined}]} iconSize={28}
                disabled = {page.url.next == undefined}
        ></Button>
    </a>
</div>