From 5eac4afb5377d1a1f55eb009cea83be8da21c13a Mon Sep 17 00:00:00 2001
From: Zack Campbell <zajrik@gmail.com>
Date: Sun, 26 Mar 2017 04:46:42 -0500
Subject: [PATCH] Add abstract StorageProvider, JSONProvider, Util.assignNested

Still so much to do T-T
---
 src/lib/Util.ts                    | 31 ++++++++++++++++++---
 src/lib/storage/JSONProvider.ts    | 43 ++++++++++++++++++++++++++++++
 src/lib/storage/StorageProvider.ts |  9 +++++++
 3 files changed, 80 insertions(+), 3 deletions(-)
 create mode 100644 src/lib/storage/JSONProvider.ts
 create mode 100644 src/lib/storage/StorageProvider.ts

diff --git a/src/lib/Util.ts b/src/lib/Util.ts
index b4de640f..72b55fce 100644
--- a/src/lib/Util.ts
+++ b/src/lib/Util.ts
@@ -8,8 +8,8 @@ export class Util
 	/**
 	 * Pads the right side of a string with spaces to the given length
 	 * @static
-	 * @param {string} text - Text to pad
-	 * @param {number} length - Length to pad to
+	 * @param {string} text Text to pad
+	 * @param {number} length Length to pad to
 	 * @returns {string}
 	 */
 	public static padRight(text: string, length: number): string
@@ -22,11 +22,36 @@ export class Util
 	 * Returns the given string lowercased with any non
 	 * alphanumeric chars removed
 	 * @static
-	 * @param {string} text - Text to normalize
+	 * @param {string} text Text to normalize
 	 * @returns {string}
 	 */
 	public static normalize(text: string): string
 	{
 		return text.toLowerCase().replace(/[^a-z0-9]+/g, '');
 	}
+
+	/**
+	 * Assigns the given value along the given nested path within
+	 * the provided initial object
+	 * @static
+	 * @param {any} obj Object to assign to
+	 * @param {string[]} path Nested path to follow within the object
+	 * @param {any} value Value to assign within the object
+	 */
+	public static assignNested(obj: any, path: string[], value: any): void
+	{
+		if (typeof obj !== 'object' || obj instanceof Array)
+			throw new Error(`Initial input of type '${typeof obj}' is not valid for nested assignment`);
+
+		if (path.length === 0)
+			throw new Error('Missing nested assignment path');
+
+		let first: string = path.shift();
+		if (typeof obj[first] === 'undefined') obj[first] = {};
+		if (path.length > 1 && (typeof obj[first] !== 'object' || obj[first] instanceof Array))
+			throw new Error(`Target '${first}' is not valid for nested assignment.`);
+
+		if (path.length === 0) obj[first] = value;
+		else Util.assignNested(obj[first], path, value);
+	}
 }
diff --git a/src/lib/storage/JSONProvider.ts b/src/lib/storage/JSONProvider.ts
new file mode 100644
index 00000000..1d9a0a28
--- /dev/null
+++ b/src/lib/storage/JSONProvider.ts
@@ -0,0 +1,43 @@
+import { StorageProvider } from './StorageProvider';
+import DB = require('node-json-db');
+
+export class JSONProvider extends StorageProvider
+{
+	private _name: string;
+	private _db: DB;
+	public constructor(name: string)
+	{
+		super();
+		this._name = name;
+	}
+
+	public async init(): Promise<void>
+	{
+		this._db = new DB(`storage/${this._name}`);
+	}
+
+	public async keys(): Promise<string[]>
+	{
+		return Object.keys(this._db.getData('/'));
+	}
+
+	public async get(key: string): Promise<string>
+	{
+		return this._db.getData(`/${key}`);
+	}
+
+	public async set(key: string, value: string): Promise<void>
+	{
+		this._db.push(`/${key}`, value);
+	}
+
+	public async remove(key: string): Promise<void>
+	{
+		this._db.delete(`/${key}`);
+	}
+
+	public async clear(): Promise<void>
+	{
+		for (const key of await this.keys()) this._db.delete(`/${key}`);
+	}
+}
diff --git a/src/lib/storage/StorageProvider.ts b/src/lib/storage/StorageProvider.ts
new file mode 100644
index 00000000..e3cda74f
--- /dev/null
+++ b/src/lib/storage/StorageProvider.ts
@@ -0,0 +1,9 @@
+export abstract class StorageProvider
+{
+	public abstract async init(): Promise<void>;
+	public abstract async keys(): Promise<string[]>;
+	public abstract async get(key: string): Promise<string>;
+	public abstract async set(key: string, value: string): Promise<void>;
+	public abstract async remove(key: string): Promise<void>;
+	public abstract async clear(): Promise<void>;
+}