From 72eb80c82c45c0d336104fec3c2407f8811ff92a Mon Sep 17 00:00:00 2001
From: bloodwiing <bloodwiing+git@alchemix.dev>
Date: Fri, 17 May 2024 16:27:49 +0300
Subject: [PATCH] Add: JSON Serialization and Parsing

---
 src/lib/serialize/base.js  | 61 +++++++++++++++++++++++++++++++++
 src/lib/serialize/parse.js | 69 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 130 insertions(+)
 create mode 100644 src/lib/serialize/base.js
 create mode 100644 src/lib/serialize/parse.js

diff --git a/src/lib/serialize/base.js b/src/lib/serialize/base.js
new file mode 100644
index 0000000..12b23f6
--- /dev/null
+++ b/src/lib/serialize/base.js
@@ -0,0 +1,61 @@
+/**
+ * @param {string} key 
+ * @param {any} value 
+ * @returns {any}
+ */
+function replacer(key, value) {
+  switch (typeof value) {
+    case 'bigint':
+      return value.toString();
+    
+    case 'object':
+      if (value instanceof Date) {
+        return value.toJSON();
+      }
+      return value;
+
+    default:
+      return value;
+  }
+}
+
+/**
+ * @param {any} data 
+ * @returns {string}
+ */
+export function jsonSerialize(data) {
+  return JSON.stringify(data, replacer);
+}
+
+/**
+ * @template T
+ * @param {{[key: string]: any}} object 
+ * @param {string} key 
+ * @param {T} def
+ * @returns {T} */ 
+export function get(object, key, def) {
+  try {
+    return object[key];
+  } catch {
+    return def;
+  }
+}
+
+/**
+ * @param {{[key: string]: any}} object 
+ * @param {string} key 
+ * @returns {Date} */ 
+export function getDate(object, key) {
+  return new Date(Date.parse(get(object, key, (new Date()).toJSON())));
+}
+
+/**
+ * @param {{[key: string]: any}} object 
+ * @param {string} key
+ * @param {{[key: string]: any} | null} def
+ * @param {function({[key: string]: any}): any} callback 
+ */
+export function getObject(object, key, def, callback) {
+  const data = key in object ? get(object, key, def) : def;
+  return data ? callback(data) : null;
+}
diff --git a/src/lib/serialize/parse.js b/src/lib/serialize/parse.js
new file mode 100644
index 0000000..b2dd341
--- /dev/null
+++ b/src/lib/serialize/parse.js
@@ -0,0 +1,69 @@
+import { get, getDate, getObject } from "./base";
+
+/**
+ * @param {object} object 
+ * @returns {import("$types/base").Rating}
+ */
+export function parseRating(object) {
+  return {
+    likes: BigInt(get(object, 'likes', 0)),
+    dislikes: BigInt(get(object, 'dislikes', 0)),
+  };
+}
+
+/**
+ * @param {object} object 
+ * @returns {import("$types/base").Category}
+ */
+export function parseCategory(object) {
+  return {
+    id: get(object, 'id', 0),
+    name: get(object, 'name', ''),
+  };
+}
+
+/**
+ * @param {object} object 
+ * @returns {import("$types/base").User}
+ */
+export function parseUser(object) {
+  return {
+    id: get(object, 'id', 0),
+    name: get(object, 'name', ''),
+    joinDate: getDate(object, 'joinDate'),
+  };
+}
+
+/**
+ * @param {object} object 
+ * @returns {import("$types/base").PostMetrics}
+ */
+export function parsePostMetrics(object) {
+  return {
+    commentCount: BigInt(get(object, 'commentCount', 0)),
+    userCount: BigInt(get(object, 'userCount', 0)),
+    latestActivity: getDate(object, 'latestActivity'),
+    engagement: BigInt(get(object, 'engagement', 0)),
+    age: get(object, 'age', 0),
+    relevancy: get(object, 'relevancy', 0),
+  };
+}
+
+/**
+ * @param {object} object 
+ * @returns {import("$types/base").Post}
+ */
+export function parsePost(object) {
+  return {
+    id: get(object, 'id', 0),
+    name: get(object, 'name', ''),
+    author: getObject(object, 'author', null, parseUser),
+    content: get(object, 'content', ''),
+    category: getObject(object, 'category', {}, parseCategory),
+    edited: get(object, 'edited', false),
+    editCount: get(object, 'editCount', 0),
+    postDate: getDate(object, 'postDate'),
+    rating: getObject(object, 'rating', {}, parseRating),
+    metrics: getObject(object, 'metrics', null, parsePostMetrics),
+  };
+}