From 8b891ac26f44417c5e162360539c298364f9f39f Mon Sep 17 00:00:00 2001
From: Anton Vikulov <rndnm@yandex-team.ru>
Date: Fri, 10 Nov 2023 16:27:07 +0500
Subject: [PATCH] feat(ChangelogDialog): loading state

---
 .../ChangelogDialog/ChangelogDialog.tsx       | 36 ++++++----
 .../__stories__/ChangelogDialog.stories.tsx   | 14 +++-
 .../components/ItemSkeleton/ItemSkeleton.scss | 68 +++++++++++++++++++
 .../components/ItemSkeleton/ItemSkeleton.tsx  | 51 ++++++++++++++
 4 files changed, 155 insertions(+), 14 deletions(-)
 create mode 100644 src/components/ChangelogDialog/components/ItemSkeleton/ItemSkeleton.scss
 create mode 100644 src/components/ChangelogDialog/components/ItemSkeleton/ItemSkeleton.tsx

diff --git a/src/components/ChangelogDialog/ChangelogDialog.tsx b/src/components/ChangelogDialog/ChangelogDialog.tsx
index bd1a7448..8a90a754 100644
--- a/src/components/ChangelogDialog/ChangelogDialog.tsx
+++ b/src/components/ChangelogDialog/ChangelogDialog.tsx
@@ -1,4 +1,4 @@
-import React from 'react';
+import React, {Fragment} from 'react';
 
 import {ArrowUpRightFromSquare} from '@gravity-ui/icons';
 import type {DialogProps} from '@gravity-ui/uikit';
@@ -7,6 +7,7 @@ import {Dialog, Icon, Link} from '@gravity-ui/uikit';
 import {block} from '../utils/cn';
 
 import {Item} from './components/Item/Item';
+import {ItemSkeleton} from './components/ItemSkeleton/ItemSkeleton';
 import i18n from './i18n';
 import type {ChangelogItem} from './types';
 
@@ -24,6 +25,7 @@ export interface ChangelogDialogProps {
     onClose: DialogProps['onClose'];
     onLinkClick?: (link: string) => void;
     onStoryClick?: (storyId: string) => void;
+    loading?: boolean;
 }
 
 let nextId = 1;
@@ -41,6 +43,7 @@ export function ChangelogDialog({
     onClose,
     onStoryClick,
     onLinkClick,
+    loading = true,
 }: ChangelogDialogProps) {
     const idRef = React.useRef<number>();
     idRef.current = idRef.current || getNextId();
@@ -67,19 +70,26 @@ export function ChangelogDialog({
                 </Dialog.Body>
             ) : null}
             <Dialog.Body key="items" className={b('items-container')}>
-                {items.length > 0 ? (
-                    items.map((item, index) => (
-                        <Item
-                            key={index}
-                            className={b('item')}
-                            data={item}
-                            onStoryClick={onStoryClick}
-                            onLinkClick={onLinkClick}
-                        />
-                    ))
-                ) : (
-                    <div className={b('empty-placeholder')}>{i18n('label_empty')}</div>
+                {loading && (
+                    <Fragment>
+                        <ItemSkeleton className={b('item')} withImage withDescription withLink />
+                        <ItemSkeleton className={b('item')} isNew withDescription withLink />
+                    </Fragment>
                 )}
+                {!loading &&
+                    (items.length > 0 ? (
+                        items.map((item, index) => (
+                            <Item
+                                key={index}
+                                className={b('item')}
+                                data={item}
+                                onStoryClick={onStoryClick}
+                                onLinkClick={onLinkClick}
+                            />
+                        ))
+                    ) : (
+                        <div className={b('empty-placeholder')}>{i18n('label_empty')}</div>
+                    ))}
             </Dialog.Body>
         </Dialog>
     );
diff --git a/src/components/ChangelogDialog/__stories__/ChangelogDialog.stories.tsx b/src/components/ChangelogDialog/__stories__/ChangelogDialog.stories.tsx
index 64975335..8c9e0c36 100644
--- a/src/components/ChangelogDialog/__stories__/ChangelogDialog.stories.tsx
+++ b/src/components/ChangelogDialog/__stories__/ChangelogDialog.stories.tsx
@@ -1,4 +1,4 @@
-import React from 'react';
+import React, {useEffect} from 'react';
 
 import {Button} from '@gravity-ui/uikit';
 import type {Meta, StoryFn} from '@storybook/react';
@@ -79,11 +79,22 @@ const items: ChangelogItem[] = [
 
 const DefaultTemplate: StoryFn<ChangelogDialogProps> = (props: ChangelogDialogProps) => {
     const [visible, setVisible] = React.useState(props.open);
+    const [loading, setLoading] = React.useState(true);
 
     React.useEffect(() => {
         setVisible(props.open);
     }, [props.open]);
 
+    useEffect(() => {
+        if (!visible) return;
+        const timeoutId = setTimeout(() => setLoading(false), 1000);
+        // eslint-disable-next-line consistent-return
+        return () => {
+            clearTimeout(timeoutId);
+            setLoading(true);
+        };
+    }, [visible]);
+
     return (
         <React.Fragment>
             <div>
@@ -98,6 +109,7 @@ const DefaultTemplate: StoryFn<ChangelogDialogProps> = (props: ChangelogDialogPr
             <ChangelogDialog
                 {...props}
                 open={visible}
+                loading={loading}
                 onClose={(event, reason) => {
                     setVisible(false);
                     props.onClose?.(event, reason);
diff --git a/src/components/ChangelogDialog/components/ItemSkeleton/ItemSkeleton.scss b/src/components/ChangelogDialog/components/ItemSkeleton/ItemSkeleton.scss
new file mode 100644
index 00000000..d32f18fc
--- /dev/null
+++ b/src/components/ChangelogDialog/components/ItemSkeleton/ItemSkeleton.scss
@@ -0,0 +1,68 @@
+@use '@gravity-ui/uikit/styles/mixins';
+@use '../../../variables';
+
+$block: '.#{variables.$ns}changelog-dialog-item';
+$metaWidth: 80px;
+
+#{$block} {
+    display: flex;
+
+    &__meta {
+        width: $metaWidth;
+    }
+
+    &__date {
+        line-height: var(--g-text-subheader-3-line-height);
+    }
+
+    &__date-skeleton {
+        width: 80px;
+        height: 20px;
+    }
+
+    &__label-new-skeleton {
+        margin-top: var(--g-spacing-2);
+        width: 42px;
+        height: 20px;
+    }
+
+    &__content {
+        flex: 1;
+        margin-left: var(--g-spacing-5);
+    }
+
+    &__title {
+        margin: 0;
+    }
+
+    &__title-skeleton {
+        width: 100%;
+        height: 20px;
+    }
+
+    &__image-skeleton {
+        width: 100%;
+        height: 258px;
+        margin-top: var(--g-spacing-3);
+        border-radius: 16px;
+    }
+
+    &__description {
+        margin-top: var(--g-spacing-3);
+    }
+
+    &__description-skeleton {
+        width: 100%;
+        height: 54px;
+    }
+
+    &__button-skeleton {
+        margin-top: var(--g-spacing-4);
+        width: 86px;
+        height: 28px;
+    }
+
+    &__button-skeleton + &__button-skeleton {
+        margin-left: var(--g-spacing-4);
+    }
+}
diff --git a/src/components/ChangelogDialog/components/ItemSkeleton/ItemSkeleton.tsx b/src/components/ChangelogDialog/components/ItemSkeleton/ItemSkeleton.tsx
new file mode 100644
index 00000000..ea8b7870
--- /dev/null
+++ b/src/components/ChangelogDialog/components/ItemSkeleton/ItemSkeleton.tsx
@@ -0,0 +1,51 @@
+import React from 'react';
+
+import {Skeleton} from '@gravity-ui/uikit';
+
+import {block} from '../../../utils/cn';
+
+import './ItemSkeleton.scss';
+
+const b = block('changelog-dialog-item');
+
+interface ItemSkeletonProps {
+    className?: string;
+    isNew?: boolean;
+    withImage?: boolean;
+    withDescription?: boolean;
+    withLink?: boolean;
+    withStory?: boolean;
+}
+
+export function ItemSkeleton({
+    className,
+    withImage,
+    isNew,
+    withDescription,
+    withLink,
+    withStory,
+}: ItemSkeletonProps) {
+    return (
+        <article className={b(null, className)}>
+            <div className={b('meta')}>
+                <div className={b('date')}>
+                    <Skeleton className={b('date-skeleton')} />
+                    {isNew && <Skeleton className={b('label-new-skeleton')} />}
+                </div>
+            </div>
+            <div className={b('content')}>
+                <h3 className={b('title')}>
+                    <Skeleton className={b('title-skeleton')} />
+                </h3>
+                {withImage && <Skeleton className={b('image-skeleton')} />}
+                {withDescription && (
+                    <div className={b('description')}>
+                        <Skeleton className={b('description-skeleton')} />
+                    </div>
+                )}
+                {withLink && <Skeleton className={b('button-skeleton')} />}
+                {withStory && <Skeleton className={b('button-skeleton')} />}
+            </div>
+        </article>
+    );
+}