From 17bee78e70e78d48c9d1063b4b7842e6114e0c0a Mon Sep 17 00:00:00 2001
From: Bauke <me@bauke.xyz>
Date: Fri, 30 Jun 2023 11:21:39 +0200
Subject: [PATCH] Add the Hide Topics storage logic.

---
 source/storage/enums.ts       |  1 +
 source/storage/exports.ts     |  3 ++
 source/storage/hide-topics.ts | 64 +++++++++++++++++++++++++++++++++++
 3 files changed, 68 insertions(+)
 create mode 100644 source/storage/hide-topics.ts

diff --git a/source/storage/enums.ts b/source/storage/enums.ts
index 8492cc2..c5021d5 100644
--- a/source/storage/enums.ts
+++ b/source/storage/enums.ts
@@ -6,6 +6,7 @@ export enum Feature {
   Autocomplete = "autocomplete",
   BackToTop = "back-to-top",
   Debug = "debug",
+  HideTopics = "hide-topics",
   HideVotes = "hide-votes",
   JumpToNewComment = "jump-to-new-comment",
   MarkdownToolbar = "markdown-toolbar",
diff --git a/source/storage/exports.ts b/source/storage/exports.ts
index 847e4ce..e9ff4eb 100644
--- a/source/storage/exports.ts
+++ b/source/storage/exports.ts
@@ -1,11 +1,13 @@
 import {createValue} from "@holllo/webextension-storage";
 import browser from "webextension-polyfill";
 import {Data, Feature} from "./enums.js";
+import {collectHideTopicsData} from "./hide-topics.js";
 import {defaultKnownGroups} from "./known-groups.js";
 import {collectUsernameColors} from "./username-color.js";
 import {collectUserLabels} from "./user-label.js";
 
 export * from "./enums.js";
+export * from "./hide-topics.js";
 export * from "./username-color.js";
 export * from "./user-label.js";
 
@@ -56,6 +58,7 @@ export const storageValues = {
     value: "2.0.0",
     storage: browser.storage.sync,
   }),
+  [Feature.HideTopics]: collectHideTopicsData(),
   [Feature.HideVotes]: createValue({
     deserialize: (input) => JSON.parse(input) as HideVotesData,
     serialize: (input) => JSON.stringify(input),
diff --git a/source/storage/hide-topics.ts b/source/storage/hide-topics.ts
new file mode 100644
index 0000000..23b9c70
--- /dev/null
+++ b/source/storage/hide-topics.ts
@@ -0,0 +1,64 @@
+import browser from "webextension-polyfill";
+import {createValue, type Value} from "@holllo/webextension-storage";
+import {Feature} from "./enums.js";
+
+/**
+ * The different matchers for {@link HideTopicPredicate}.
+ */
+export enum HideTopicMatcher {
+  DomainIncludes = "domain-includes",
+  TildesUsernameEquals = "tildes-username-equals",
+  TitleIncludes = "title-includes",
+  UserLabelEquals = "user-label-equals",
+}
+
+/**
+ * The predicate for whether a topic should be hidden or not.
+ */
+export type HideTopicPredicate = {
+  id: number;
+  matcher: HideTopicMatcher;
+  value: string;
+};
+
+/**
+ * Shorthand for an array of {@link Value}-wrapped {@link HideTopicPredicate}s.
+ */
+export type HideTopicsData = Array<Value<HideTopicPredicate>>;
+
+/**
+ * Create a {@link Value}-wrapped {@link HideTopicPredicate}.
+ */
+export async function createValueHideTopicPredicate(
+  predicate: HideTopicPredicate,
+): Promise<HideTopicsData[number]> {
+  return createValue<HideTopicPredicate>({
+    deserialize: (input) => JSON.parse(input) as HideTopicPredicate,
+    serialize: (input) => JSON.stringify(input),
+    key: `${Feature.HideTopics}-${predicate.id}`,
+    value: predicate,
+    storage: browser.storage.sync,
+  });
+}
+
+/**
+ * Get all hide topic predicates from storage and combine them into a single
+ * array.
+ */
+export async function collectHideTopicsData(): Promise<HideTopicsData> {
+  const storage = await browser.storage.sync.get();
+  const predicates = [];
+  for (const [key, value] of Object.entries(storage)) {
+    if (!key.startsWith(Feature.HideTopics)) {
+      continue;
+    }
+
+    predicates.push(
+      await createValueHideTopicPredicate(
+        JSON.parse(value as string) as HideTopicPredicate,
+      ),
+    );
+  }
+
+  return predicates;
+}