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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { z } from 'zod';
/**
* Zod schema for validating a cursor position.
*/
export const CursorSchema = z.object({
line: z.number(),
character: z.number(),
});
export type Cursor = z.infer<typeof CursorSchema>;
/**
* Zod schema for validating an active file context from the IDE.
*/
export const OpenFilesSchema = z.object({
activeFile: z.string(),
selectedText: z.string().optional(),
cursor: CursorSchema.optional(),
recentOpenFiles: z
.array(
z.object({
filePath: z.string(),
timestamp: z.number(),
}),
)
.optional(),
});
export type OpenFiles = z.infer<typeof OpenFilesSchema>;
/**
* Zod schema for validating the 'ide/openFilesChanged' notification from the IDE.
*/
export const OpenFilesNotificationSchema = z.object({
method: z.literal('ide/openFilesChanged'),
params: OpenFilesSchema,
});
type OpenFilesSubscriber = (openFiles: OpenFiles | undefined) => void;
/**
* Creates a new store for managing the IDE's active file context.
* This factory function encapsulates the state and logic, allowing for the creation
* of isolated instances, which is particularly useful for testing.
*
* @returns An object with methods to interact with the active file context.
*/
export function createIdeContextStore() {
let openFilesContext: OpenFiles | undefined = undefined;
const subscribers = new Set<OpenFilesSubscriber>();
/**
* Notifies all registered subscribers about the current active file context.
*/
function notifySubscribers(): void {
for (const subscriber of subscribers) {
subscriber(openFilesContext);
}
}
/**
* Sets the active file context and notifies all registered subscribers of the change.
* @param newOpenFiles The new active file context from the IDE.
*/
function setOpenFilesContext(newOpenFiles: OpenFiles): void {
openFilesContext = newOpenFiles;
notifySubscribers();
}
/**
* Clears the active file context and notifies all registered subscribers of the change.
*/
function clearOpenFilesContext(): void {
openFilesContext = undefined;
notifySubscribers();
}
/**
* Retrieves the current active file context.
* @returns The `OpenFiles` object if a file is active; otherwise, `undefined`.
*/
function getOpenFilesContext(): OpenFiles | undefined {
return openFilesContext;
}
/**
* Subscribes to changes in the active file context.
*
* When the active file context changes, the provided `subscriber` function will be called.
* Note: The subscriber is not called with the current value upon subscription.
*
* @param subscriber The function to be called when the active file context changes.
* @returns A function that, when called, will unsubscribe the provided subscriber.
*/
function subscribeToOpenFiles(subscriber: OpenFilesSubscriber): () => void {
subscribers.add(subscriber);
return () => {
subscribers.delete(subscriber);
};
}
return {
setOpenFilesContext,
getOpenFilesContext,
subscribeToOpenFiles,
clearOpenFilesContext,
};
}
/**
* The default, shared instance of the IDE context store for the application.
*/
export const ideContext = createIdeContextStore();
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