4 files changed, 268 insertions, 0 deletions
diff --git a/apps/web/src/lib/actions/definitions.ts b/apps/web/src/lib/actions/definitions.ts
new file mode 100644
index 00000000..83144a25
--- /dev/null
+++ b/apps/web/src/lib/actions/definitions.ts
@@ -0,0 +1,162 @@
+import type { ShortcutKey } from "@/types/keybinding";
+
+export type TActionCategory =
+	| "playback"
+	| "navigation"
+	| "editing"
+	| "selection"
+	| "history"
+	| "timeline"
+	| "controls";
+
+export interface TActionDefinition {
+	description: string;
+	category: TActionCategory;
+	defaultShortcuts?: ShortcutKey[];
+	args?: Record<string, unknown>;
+}
+
+export const ACTIONS = {
+	"toggle-play": {
+		description: "Play/Pause",
+		category: "playback",
+		defaultShortcuts: ["space", "k"],
+	},
+	"stop-playback": {
+		description: "Stop playback",
+		category: "playback",
+	},
+	"seek-forward": {
+		description: "Seek forward 1 second",
+		category: "playback",
+		defaultShortcuts: ["l"],
+		args: { seconds: "number" },
+	},
+	"seek-backward": {
+		description: "Seek backward 1 second",
+		category: "playback",
+		defaultShortcuts: ["j"],
+		args: { seconds: "number" },
+	},
+	"frame-step-forward": {
+		description: "Frame step forward",
+		category: "navigation",
+		defaultShortcuts: ["right"],
+	},
+	"frame-step-backward": {
+		description: "Frame step backward",
+		category: "navigation",
+		defaultShortcuts: ["left"],
+	},
+	"jump-forward": {
+		description: "Jump forward 5 seconds",
+		category: "navigation",
+		defaultShortcuts: ["shift+right"],
+		args: { seconds: "number" },
+	},
+	"jump-backward": {
+		description: "Jump backward 5 seconds",
+		category: "navigation",
+		defaultShortcuts: ["shift+left"],
+		args: { seconds: "number" },
+	},
+	"goto-start": {
+		description: "Go to timeline start",
+		category: "navigation",
+		defaultShortcuts: ["home", "enter"],
+	},
+	"goto-end": {
+		description: "Go to timeline end",
+		category: "navigation",
+		defaultShortcuts: ["end"],
+	},
+	split: {
+		description: "Split elements at playhead",
+		category: "editing",
+		defaultShortcuts: ["s"],
+	},
+	"split-left": {
+		description: "Split and remove left",
+		category: "editing",
+		defaultShortcuts: ["q"],
+	},
+	"split-right": {
+		description: "Split and remove right",
+		category: "editing",
+		defaultShortcuts: ["w"],
+	},
+	"delete-selected": {
+		description: "Delete selected elements",
+		category: "editing",
+		defaultShortcuts: ["backspace", "delete"],
+	},
+	"copy-selected": {
+		description: "Copy selected elements",
+		category: "editing",
+		defaultShortcuts: ["ctrl+c"],
+	},
+	"paste-copied": {
+		description: "Paste elements at playhead",
+		category: "editing",
+		defaultShortcuts: ["ctrl+v"],
+	},
+	"toggle-snapping": {
+		description: "Toggle snapping",
+		category: "editing",
+		defaultShortcuts: ["n"],
+	},
+	"select-all": {
+		description: "Select all elements",
+		category: "selection",
+		defaultShortcuts: ["ctrl+a"],
+	},
+	"duplicate-selected": {
+		description: "Duplicate selected element",
+		category: "selection",
+		defaultShortcuts: ["ctrl+d"],
+	},
+	"toggle-elements-muted-selected": {
+		description: "Mute/unmute selected elements",
+		category: "selection",
+	},
+	"toggle-elements-visibility-selected": {
+		description: "Show/hide selected elements",
+		category: "selection",
+	},
+	"toggle-bookmark": {
+		description: "Toggle bookmark at playhead",
+		category: "timeline",
+	},
+	undo: {
+		description: "Undo",
+		category: "history",
+		defaultShortcuts: ["ctrl+z"],
+	},
+	redo: {
+		description: "Redo",
+		category: "history",
+		defaultShortcuts: ["ctrl+shift+z", "ctrl+y"],
+	},
+} as const satisfies Record<string, TActionDefinition>;
+
+export type TAction = keyof typeof ACTIONS;
+
+export function getActionDefinition(action: TAction): TActionDefinition {
+	return ACTIONS[action];
+}
+
+export function getDefaultShortcuts(): Record<ShortcutKey, TAction> {
+	const shortcuts: Record<string, TAction> = {};
+
+	for (const [action, def] of Object.entries(ACTIONS) as Array<
+		[TAction, TActionDefinition]
+	>) {
+		if (def.defaultShortcuts) {
+			for (const shortcut of def.defaultShortcuts) {
+				shortcuts[shortcut] = action;
+			}
+		}
+	}
+
+	return shortcuts as Record<ShortcutKey, TAction>;
+}
diff --git a/apps/web/src/lib/actions/index.ts b/apps/web/src/lib/actions/index.ts
new file mode 100644
index 00000000..801a846a
--- /dev/null
+++ b/apps/web/src/lib/actions/index.ts
@@ -0,0 +1,3 @@
+export * from "./definitions";
+export * from "./types";
+export * from "./registry";
diff --git a/apps/web/src/lib/actions/registry.ts b/apps/web/src/lib/actions/registry.ts
new file mode 100644
index 00000000..b9c84529
--- /dev/null
+++ b/apps/web/src/lib/actions/registry.ts
@@ -0,0 +1,61 @@
+import type {
+	TAction,
+	TActionFunc,
+	TActionWithArgs,
+	TActionWithOptionalArgs,
+	TActionArgsMap,
+	TArgOfAction,
+	TInvocationTrigger,
+} from "./types";
+
+type ActionHandler = (arg: unknown, trigger?: TInvocationTrigger) => void;
+const boundActions: Partial<Record<TAction, ActionHandler[]>> = {};
+
+export function bindAction<A extends TAction>(
+	action: A,
+	handler: TActionFunc<A>,
+) {
+	const handlers = boundActions[action];
+	const typedHandler = handler as ActionHandler;
+	if (handlers) {
+		handlers.push(typedHandler);
+	} else {
+		boundActions[action] = [typedHandler];
+	}
+}
+
+export function unbindAction<A extends TAction>(
+	action: A,
+	handler: TActionFunc<A>,
+) {
+	const handlers = boundActions[action];
+	if (!handlers) return;
+
+	const typedHandler = handler as ActionHandler;
+	boundActions[action] = handlers.filter((h) => h !== typedHandler);
+
+	if (boundActions[action]?.length === 0) {
+		delete boundActions[action];
+	}
+}
+
+type InvokeActionFunc = {
+	(
+		action: TActionWithOptionalArgs,
+		args?: undefined,
+		trigger?: TInvocationTrigger,
+	): void;
+	<A extends TActionWithArgs>(
+		action: A,
+		args: TActionArgsMap[A],
+		trigger?: TInvocationTrigger,
+	): void;
+};
+
+export const invokeAction: InvokeActionFunc = <A extends TAction>(
+	action: A,
+	args?: TArgOfAction<A>,
+	trigger?: TInvocationTrigger,
+) => {
+	boundActions[action]?.forEach((handler) => handler(args, trigger));
+};
diff --git a/apps/web/src/lib/actions/types.ts b/apps/web/src/lib/actions/types.ts
new file mode 100644
index 00000000..508bf10e
--- /dev/null
+++ b/apps/web/src/lib/actions/types.ts
@@ -0,0 +1,42 @@
+import type { MutableRefObject } from "react";
+import type { TAction } from "./definitions";
+
+export type { TAction };
+
+export type TActionArgsMap = {
+	"seek-forward": { seconds: number } | undefined;
+	"seek-backward": { seconds: number } | undefined;
+	"jump-forward": { seconds: number } | undefined;
+	"jump-backward": { seconds: number } | undefined;
+};
+
+type TKeysWithValueUndefined<T> = {
+	[K in keyof T]: undefined extends T[K] ? K : never;
+}[keyof T];
+
+export type TActionWithArgs = keyof TActionArgsMap;
+
+export type TActionWithOptionalArgs =
+	| TActionWithNoArgs
+	| TKeysWithValueUndefined<TActionArgsMap>;
+
+export type TActionWithNoArgs = Exclude<TAction, TActionWithArgs>;
+
+export type TArgOfAction<A extends TAction> = A extends TActionWithArgs
+	? TActionArgsMap[A]
+	: undefined;
+
+export type TActionFunc<A extends TAction> = A extends TActionWithArgs
+	? (arg: TArgOfAction<A>, trigger?: TInvocationTrigger) => void
+	: (_?: undefined, trigger?: TInvocationTrigger) => void;
+
+export type TInvocationTrigger = "keypress" | "mouseclick";
+
+export type TBoundActionList = {
+	[A in TAction]?: Array<TActionFunc<A>>;
+};
+
+export type TActionHandlerOptions =
+	| MutableRefObject<boolean>
+	| boolean
+	| undefined;