From e19d284a91e287ecfb2f14dfd58a46cc7f415d6f Mon Sep 17 00:00:00 2001
From: Prozilla <business@prozilla.dev>
Date: Sun, 17 Dec 2023 11:25:01 +0100
Subject: [PATCH] Added file explorer history navigation

---
 .../file-explorer/FileExplorer.jsx            | 53 +++++++++++++------
 .../file-explorer/FileExplorer.module.css     | 12 ++++-
 src/hooks/utils/history.js                    | 49 +++++++++++++++++
 3 files changed, 97 insertions(+), 17 deletions(-)
 create mode 100644 src/hooks/utils/history.js

diff --git a/src/components/applications/file-explorer/FileExplorer.jsx b/src/components/applications/file-explorer/FileExplorer.jsx
index accae59..ec0b80e 100644
--- a/src/components/applications/file-explorer/FileExplorer.jsx
+++ b/src/components/applications/file-explorer/FileExplorer.jsx
@@ -1,4 +1,4 @@
-import { useState } from "react";
+import { useCallback, useEffect, useState } from "react";
 import { useVirtualRoot } from "../../../hooks/virtual-drive/virtualRootContext.js";
 import styles from "./FileExplorer.module.css";
 import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
@@ -18,6 +18,7 @@ import AppsManager from "../../../features/applications/applications.js";
 import { APPS } from "../../../constants/applications.js";
 import { TITLE_SEPARATOR } from "../../../constants/windows.js";
 import { FileProperties } from "../../modals/file-properties/FileProperties.jsx";
+import { useHistory } from "../../../hooks/utils/history.js";
 
 /**
  * @param {import("../../windows/WindowView.jsx").windowProps} props 
@@ -28,6 +29,7 @@ export function FileExplorer({ startPath, app, modalsManager }) {
 	const [path, setPath] = useState(currentDirectory?.path ?? "");
 	const windowsManager = useWindowsManager();
 	const [showHidden] = useState(true);
+	const { history, stateIndex, pushState, undo, redo, undoAvailable, redoAvailable } = useHistory(currentDirectory.path);
 
 	const { openWindowedModal } = useWindowedModal({ modalsManager });
 	const { onContextMenu: onContextMenuFile } = useContextMenu({ modalsManager, Actions: (props) =>
@@ -46,15 +48,6 @@ export function FileExplorer({ startPath, app, modalsManager }) {
 					Modal: (props) =>
 						<FileProperties file={file} {...props}/>
 				});
-				// modalsManager.open(new Modal(FileProperties)
-				// 	.setPosition(new Vector2(positionX, positionY))
-				// 	.setProps({
-				// 		triggerParams: params,
-				// 		className: STYLES.CONTEXT_MENU,
-				// 		onAnyTrigger: () => {
-				// 			newModal.close();
-				// 		}
-				// 	}));
 			}}/>
 		</Actions>
 	});
@@ -76,7 +69,10 @@ export function FileExplorer({ startPath, app, modalsManager }) {
 	// 	}
 	// });
 
-	const changeDirectory = (path, absolute = false) => {
+	const changeDirectory = useCallback((path, absolute = false) => {
+		if (path == null)
+			return;
+
 		if (currentDirectory == null)
 			absolute = true;
 
@@ -84,14 +80,27 @@ export function FileExplorer({ startPath, app, modalsManager }) {
 
 		console.debug(directory);
 
-		if (directory) {
+		if (directory != null) {
+			setCurrentDirectory(directory);
+			setPath(directory.root ? "/" : directory.path);
+			pushState(directory.path);
+		}
+	}, [currentDirectory, pushState, virtualRoot]);
+
+	useEffect(() => {
+		if (history.length === 0)
+			return;
+
+		const path = history[stateIndex];
+		const directory = virtualRoot.navigate(path);
+		if (directory != null) {
 			setCurrentDirectory(directory);
 			setPath(directory.root ? "/" : directory.path);
 		}
-	};
+	}, [history, stateIndex, virtualRoot]);
 
 	const onPathChange = (event) => {
-		return setPath(event.target.value);
+		setPath(event.target.value);
 	};
 
 	const onKeyDown = (event) => {
@@ -113,10 +122,22 @@ export function FileExplorer({ startPath, app, modalsManager }) {
 	return (
 		<div className={styles.Container}>
 			<div className={styles.Header}>
-				<button title="Back" tabIndex={0} className={styles["Icon-button"]}>
+				<button
+					title="Back"
+					tabIndex={0}
+					className={styles["Icon-button"]}
+					onClick={undo}
+					disabled={!undoAvailable}
+				>
 					<FontAwesomeIcon icon={faCaretLeft}/>
 				</button>
-				<button title="Forward" tabIndex={0} className={styles["Icon-button"]}>
+				<button
+					title="Forward"
+					tabIndex={0}
+					className={styles["Icon-button"]}
+					onClick={redo}
+					disabled={!redoAvailable}
+				>
 					<FontAwesomeIcon icon={faCaretRight}/>
 				</button>
 				<button title="Up" tabIndex={0} className={styles["Icon-button"]} onClick={() => { changeDirectory(".."); }}>
diff --git a/src/components/applications/file-explorer/FileExplorer.module.css b/src/components/applications/file-explorer/FileExplorer.module.css
index 94cdb7a..661fe83 100644
--- a/src/components/applications/file-explorer/FileExplorer.module.css
+++ b/src/components/applications/file-explorer/FileExplorer.module.css
@@ -20,11 +20,12 @@
 }
 
 .Icon-button {
+	--color: var(--foreground-color-a);
+
 	position: relative;
 	height: 1.25rem;
 	width: auto;
 	padding: 0;
-	color: var(--foreground-a);
 	background: none;
 	border: none;
 	outline: none;
@@ -51,10 +52,19 @@
 	transform: scale(150%);
 }
 
+.Icon-button:disabled {
+	--color: var(--foreground-color-c);
+}
+
 .Icon-button svg {
 	height: 100%;
 }
 
+.Icon-button svg path {
+	fill: var(--color);
+	transition: fill 100ms ease-in-out;
+}
+
 .Path-input {
 	flex: 1;
 	padding: 0.25rem 0.5rem;
diff --git a/src/hooks/utils/history.js b/src/hooks/utils/history.js
new file mode 100644
index 0000000..5841906
--- /dev/null
+++ b/src/hooks/utils/history.js
@@ -0,0 +1,49 @@
+import { useState } from "react";
+import { clamp } from "../../features/math/clamp.js";
+
+/**
+ * @param {*} initialState 
+ * @returns {{
+ * 	history: *[],
+ * 	stateIndex: number,
+ * 	pushState: Function,
+ * 	undo: Function,
+ *  redo: Function,
+ * 	undoAvailable: boolean,
+ *  redoAvailable: boolean
+ * }}
+ */
+export function useHistory(initialState) {
+	const [history, setHistory] = useState(initialState ? [initialState] : []);
+	const [stateIndex, setStateIndex] = useState(0);
+
+	const pushState = (state) => {
+		if (state === history[0])
+			return;
+
+		const newHistory = [
+			state,
+			...history.slice(stateIndex, history.length)
+		];
+
+		setHistory(newHistory);
+		setStateIndex(0);
+	};
+
+	const updateStateIndex = (delta) => {
+		const index = clamp(stateIndex + delta, 0, history.length - 1);
+
+		if (index === stateIndex)
+			return;
+
+		setStateIndex(index);
+	};
+
+	const undo = () => updateStateIndex(1);
+	const redo = () => updateStateIndex(-1);
+
+	const undoAvailable = (stateIndex < history.length - 1);
+	const redoAvailable = (stateIndex >= 1);
+
+	return { history, stateIndex, pushState, undo, redo, undoAvailable, redoAvailable };
+}
\ No newline at end of file