From db17b25a759bde3ebca2b282d1bc45cd51a78840 Mon Sep 17 00:00:00 2001
From: Fuwn <contact@fuwn.me>
Date: Tue, 2 Jan 2024 15:21:59 -0800
Subject: feat(tools): random follower finder

---
 src/lib/AniList/following.ts        | 56 +++++++++++++++++++++++++++++++++++
 src/lib/Error/RateLimited.svelte    | 59 +++++++++++++++++++++++++------------
 src/lib/Tools/RandomFollower.svelte | 56 +++++++++++++++++++++++++++++++++++
 3 files changed, 152 insertions(+), 19 deletions(-)
 create mode 100644 src/lib/AniList/following.ts
 create mode 100644 src/lib/Tools/RandomFollower.svelte

(limited to 'src/lib')

diff --git a/src/lib/AniList/following.ts b/src/lib/AniList/following.ts
new file mode 100644
index 00000000..1bba66b9
--- /dev/null
+++ b/src/lib/AniList/following.ts
@@ -0,0 +1,56 @@
+import { user, type User } from './user';
+
+export interface FollowingPage {
+	data: {
+		Page: {
+			pageInfo: {
+				hasNextPage: boolean;
+			};
+			following: Partial<User>[];
+		};
+	};
+}
+
+const followingPage = async (page: number, id: number): Promise<FollowingPage> =>
+	await (
+		await fetch('https://graphql.anilist.co', {
+			method: 'POST',
+			headers: {
+				'Content-Type': 'application/json',
+				Accept: 'application/json'
+			},
+			body: JSON.stringify({
+				query: `{
+					Page(page: ${page}) {
+    				pageInfo { hasNextPage }
+						following(userId: ${id}) { name id }
+					}
+				}`
+			})
+		})
+	).json();
+
+export const followers = async (name: string): Promise<Partial<User>[]> => {
+	const activities = [];
+	let page = 1;
+	const id = (await user(name)).id;
+	let currentPage = await followingPage(page, id);
+
+	for (const activity of currentPage.data.Page.following) activities.push(activity);
+
+	while (currentPage['data']['Page']['pageInfo']['hasNextPage']) {
+		for (const activity of currentPage.data.Page.following) activities.push(activity);
+
+		page += 1;
+		currentPage = await followingPage(page, id);
+	}
+
+	for (const activity of currentPage.data.Page.following) activities.push(activity);
+
+	for (let i = activities.length - 1; i > 0; i--) {
+		const j = Math.floor(Math.random() * (i + 1));
+		[activities[i], activities[j]] = [activities[j], activities[i]];
+	}
+
+	return activities;
+};
diff --git a/src/lib/Error/RateLimited.svelte b/src/lib/Error/RateLimited.svelte
index 59de182d..ce5afdba 100644
--- a/src/lib/Error/RateLimited.svelte
+++ b/src/lib/Error/RateLimited.svelte
@@ -2,26 +2,47 @@
 	export let type = 'Media';
 	export let loginSessionError = true;
 	export let contact = true;
+	export let list = true;
 </script>
 
-<ul>
-	<li>
-		<p>
-			{type} could not be loaded. You might have been
-			<a href="https://en.wikipedia.org/wiki/Rate_limiting" target="_blank">rate limited</a>.
-		</p>
-		{#if loginSessionError}
-			<p>
-				Your login session may have expired. Try logging out and logging back in, or try again in a
-				few minutes.
-			</p>
-		{/if}
-		<slot />
-		{#if contact}
+{#if list}
+	<ul>
+		<li>
 			<p>
-				If the problem persists, please contact
-				<a href="https://anilist.co/user/fuwn" target="_blank">@fuwn</a> on AniList.
+				{type} could not be loaded. You might have been
+				<a href="https://en.wikipedia.org/wiki/Rate_limiting" target="_blank">rate limited</a>.
 			</p>
-		{/if}
-	</li>
-</ul>
+			{#if loginSessionError}
+				<p>
+					Your login session may have expired. Try logging out and logging back in, or try again in
+					a few minutes.
+				</p>
+			{/if}
+			<slot />
+			{#if contact}
+				<p>
+					If the problem persists, please contact
+					<a href="https://anilist.co/user/fuwn" target="_blank">@fuwn</a> on AniList.
+				</p>
+			{/if}
+		</li>
+	</ul>
+{:else}
+	<p>
+		{type} could not be loaded. You might have been
+		<a href="https://en.wikipedia.org/wiki/Rate_limiting" target="_blank">rate limited</a>.
+	</p>
+	{#if loginSessionError}
+		<p>
+			Your login session may have expired. Try logging out and logging back in, or try again in a
+			few minutes.
+		</p>
+	{/if}
+	<slot />
+	{#if contact}
+		<p>
+			If the problem persists, please contact
+			<a href="https://anilist.co/user/fuwn" target="_blank">@fuwn</a> on AniList.
+		</p>
+	{/if}
+{/if}
diff --git a/src/lib/Tools/RandomFollower.svelte b/src/lib/Tools/RandomFollower.svelte
new file mode 100644
index 00000000..e52d4e86
--- /dev/null
+++ b/src/lib/Tools/RandomFollower.svelte
@@ -0,0 +1,56 @@
+<script lang="ts">
+	import { followers } from '$lib/AniList/following';
+	import RateLimited from '$lib/Error/RateLimited.svelte';
+	import { clearAllParameters } from '$lib/Utility/parameters';
+	import { onMount } from 'svelte';
+
+	let input = '';
+	let submit = '';
+	let randomSeed = 0;
+
+	onMount(clearAllParameters);
+</script>
+
+<p>
+	<!-- svelte-ignore missing-declaration -->
+	<input
+		type="text"
+		placeholder="Username"
+		bind:value={input}
+		on:keypress={(e) => {
+			if (e.key === 'Enter') {
+				submit = input;
+				randomSeed = Math.random();
+
+				// eslint-disable-next-line no-undef
+				umami.track('Random Follower');
+			}
+		}}
+	/>
+	<a
+		href={`#`}
+		on:click={() => (submit = input) && (randomSeed = Math.random())}
+		title="Or click your Enter key"
+		data-umami-event="Random Follower"
+	>
+		Generate
+	</a>
+</p>
+
+{#if submit !== ''}
+	{#await followers(submit)}
+		Loading followers ... 50%
+	{:then users}
+		{@const user = users[Math.floor(randomSeed * users.length)]}
+
+		<p>
+			<a href={`https://anilist.co/user/${user.id}`} target="_blank">
+				{user.name}
+			</a>
+		</p>
+	{:catch}
+		<RateLimited type="Followers" list={false} />
+	{/await}
+{:else}
+	<p>Enter a username to search for to continue.</p>
+{/if}
-- 
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