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import { Command } from "@/types/commands";
interface SerializedStacks {
undoStack: Command[];
redoStack: Command[];
}
interface FlowsheetStacks {
[flowsheetId: string]: SerializedStacks;
}
interface UndoRedoSnapshot {
canUndo: boolean;
canRedo: boolean;
flowsheetId: string | null;
isReady: boolean;
undoStackSize: number;
redoStackSize: number;
}
class UndoRedoStore {
private subscribers = new Set<() => void>();
private currentFlowsheet: string | null = null;
private readonly maxStackSize: number = 100;
private readonly storageKey: string = "ahuoraUndoRedoHistory";
private stacksByFlowsheet: Map<
string,
{ undoStack: Command[]; redoStack: Command[] }
> = new Map();
private initialized: boolean = false;
// Cache the snapshot to prevent unnecessary re-renders
private cachedSnapshot: UndoRedoSnapshot | null = null;
constructor() {
this.loadAllStacks();
this.updateSnapshot(); // Initialize snapshot
this.initialized = true;
}
/**
* Update and cache the snapshot - follows React's immutable pattern
* Only creates new snapshot if state actually changed
*/
private updateSnapshot(): void {
const undoStackSize = this.getUndoStackSize();
const redoStackSize = this.getRedoStackSize();
const newSnapshot: UndoRedoSnapshot = {
canUndo: undoStackSize > 0,
canRedo: redoStackSize > 0,
flowsheetId: this.currentFlowsheet,
isReady: this.currentFlowsheet !== null && this.initialized,
undoStackSize,
redoStackSize,
};
// Only update cached snapshot if it actually changed (React best practice)
if (
!this.cachedSnapshot ||
this.cachedSnapshot.canUndo !== newSnapshot.canUndo ||
this.cachedSnapshot.canRedo !== newSnapshot.canRedo ||
this.cachedSnapshot.flowsheetId !== newSnapshot.flowsheetId ||
this.cachedSnapshot.isReady !== newSnapshot.isReady ||
this.cachedSnapshot.undoStackSize !== newSnapshot.undoStackSize ||
this.cachedSnapshot.redoStackSize !== newSnapshot.redoStackSize
) {
// Create new immutable snapshot
this.cachedSnapshot = Object.freeze(newSnapshot);
}
}
/**
* Get current snapshot for React to render
* This is the single source of truth for UI state
* Returns immutable snapshot to comply with React's requirements
*/
getSnapshot = (): UndoRedoSnapshot => {
Iif (!this.cachedSnapshot) {
this.updateSnapshot();
}
return this.cachedSnapshot!;
};
/**
* Set the current flowsheet - this makes the store "ready"
*/
setFlowsheet(id: string): void {
if (this.currentFlowsheet !== id) {
this.currentFlowsheet = id;
// Initialize stacks for this flowsheet if they don't exist
if (!this.stacksByFlowsheet.has(id)) {
this.stacksByFlowsheet.set(id, {
undoStack: [],
redoStack: [],
});
}
this.updateSnapshot();
this.emit(); // Notify React of state change
}
}
/**
* Add command - only works if flowsheet is set
*/
addCommand(cmd: Command): void {
Iif (!this.currentFlowsheet) {
console.warn("[UndoRedoStore] Cannot add command: No flowsheet set");
return; // Prevents race condition
}
Iif (!cmd?.type) {
console.error("[UndoRedoStore] Invalid command: missing type", cmd);
return;
}
const stacks = this.stacksByFlowsheet.get(this.currentFlowsheet)!;
// Create immutable command with timestamp
const commandWithTimestamp: Command = Object.freeze({
...cmd,
timestamp: Date.now(),
});
// Update stacks immutably
stacks.undoStack.push(commandWithTimestamp);
stacks.redoStack = []; // Clear redo stack
// Enforce max stack size
Iif (stacks.undoStack.length > this.maxStackSize) {
stacks.undoStack.shift();
}
this.saveAllStacks();
this.updateSnapshot();
this.emit(); // Live update to React
}
/**
* Undo operation - returns command for execution
*/
undo(): Command | null {
Iif (!this.currentFlowsheet) return null;
const stacks = this.stacksByFlowsheet.get(this.currentFlowsheet)!;
const command = stacks.undoStack.pop();
if (command) {
stacks.redoStack.push(command);
this.saveAllStacks();
this.updateSnapshot();
this.emit(); // Live update to React
return command;
}
return null;
}
/**
* Redo operation - returns command for execution
*/
redo(): Command | null {
Iif (!this.currentFlowsheet) return null;
const stacks = this.stacksByFlowsheet.get(this.currentFlowsheet)!;
const command = stacks.redoStack.pop();
if (command) {
stacks.undoStack.push(command);
this.saveAllStacks();
this.updateSnapshot();
this.emit(); // Live update to React
return command;
}
return null;
}
private getUndoStackSize(): number {
if (!this.currentFlowsheet) return 0;
const stacks = this.stacksByFlowsheet.get(this.currentFlowsheet);
return stacks ? stacks.undoStack.length : 0;
}
private getRedoStackSize(): number {
if (!this.currentFlowsheet) return 0;
const stacks = this.stacksByFlowsheet.get(this.currentFlowsheet);
return stacks ? stacks.redoStack.length : 0;
}
/**
* Subscribe to changes - used by useSyncExternalStore
* Returns unsubscribe function as required by React
*/
subscribe = (callback: () => void): (() => void) => {
this.subscribers.add(callback);
return () => this.subscribers.delete(callback);
};
/**
* Notify all subscribers of state changes
*/
private emit(): void {
this.subscribers.forEach((cb) => cb());
}
// ---- Additional Store Methods ----
/**
* Reset stacks for current flowsheet
*/
resetStacks(): void {
Iif (!this.currentFlowsheet) return;
const stacks = this.stacksByFlowsheet.get(this.currentFlowsheet);
Iif (stacks) {
stacks.undoStack = [];
stacks.redoStack = [];
this.saveAllStacks();
this.updateSnapshot();
this.emit();
}
}
/**
* Remove a flowsheet completely
*/
removeFlowsheet(flowsheetId: string): void {
this.stacksByFlowsheet.delete(flowsheetId);
// If this was the current flowsheet, clear it
Iif (this.currentFlowsheet === flowsheetId) {
this.currentFlowsheet = null;
}
this.saveAllStacks();
this.updateSnapshot();
this.emit();
}
/**
* Restore a command that failed to undo
*/
restoreFailedUndo(command: Command): void {
Iif (!this.currentFlowsheet) return;
const stacks = this.stacksByFlowsheet.get(this.currentFlowsheet);
Iif (stacks) {
// Remove from redo stack and put back in undo stack
const redoIndex = stacks.redoStack.findIndex(
(cmd) => cmd.timestamp === command.timestamp,
);
Iif (redoIndex !== -1) {
stacks.redoStack.splice(redoIndex, 1);
stacks.undoStack.push(command);
this.saveAllStacks();
this.updateSnapshot();
this.emit();
}
}
}
/**
* Restore a command that failed to redo
*/
restoreFailedRedo(command: Command): void {
Iif (!this.currentFlowsheet) return;
const stacks = this.stacksByFlowsheet.get(this.currentFlowsheet);
Iif (stacks) {
// Remove from undo stack and put back in redo stack
const undoIndex = stacks.undoStack.findIndex(
(cmd) => cmd.timestamp === command.timestamp,
);
Iif (undoIndex !== -1) {
stacks.undoStack.splice(undoIndex, 1);
stacks.redoStack.push(command);
this.saveAllStacks();
this.updateSnapshot();
this.emit();
}
}
}
/**
* Intelligently invalidate commands that reference deleted objects
* This accounts for soft delete behavior, custom endpoints, and complex operations
* Only invalidates commands that would truly fail if executed
*/
invalidateCommandsForObjects(deletedObjectIds: number[]): void {
Iif (!this.currentFlowsheet) return;
const stacks = this.stacksByFlowsheet.get(this.currentFlowsheet);
Iif (!stacks) return;
const deletedIdSet = new Set(deletedObjectIds);
let invalidatedCount = 0;
// More sophisticated command analysis
const shouldInvalidateCommand = (cmd: Command): boolean => {
switch (cmd.type) {
case "MOVE": {
// Only invalidate MOVE commands if the PRIMARY object is deleted
// Don't invalidate for group object references since those might be soft-deleted
Iif (
deletedIdSet.has(cmd.objectId) ||
deletedIdSet.has(cmd.graphicObjectId)
) {
invalidatedCount++;
return true;
}
return false;
}
case "DELETE":
// DELETE commands should NOT be invalidated - they may need to be undone
// even if the objects are currently deleted (soft delete scenario)
return false;
case "CONNECT":
case "DISCONNECT": {
// For connection commands, only invalidate if ALL referenced objects are hard-deleted
// This allows for partial restoration scenarios
const connectionObjectIds = [cmd.objectId1, cmd.objectId2];
const allObjectsDeleted = connectionObjectIds.every((id) =>
deletedIdSet.has(id),
);
Iif (allObjectsDeleted) {
invalidatedCount++;
return true;
}
return false;
}
case "MERGE_STREAMS": {
// For merge commands, only invalidate if BOTH streams are deleted
// Single stream deletion might still allow undo (soft delete scenario)
const mergeCmd = cmd as Command & {
stream1Id?: number;
stream2Id?: number;
};
Iif (mergeCmd.stream1Id && mergeCmd.stream2Id) {
const bothStreamsDeleted =
deletedIdSet.has(mergeCmd.stream1Id) &&
deletedIdSet.has(mergeCmd.stream2Id);
Iif (bothStreamsDeleted) {
invalidatedCount++;
return true;
}
}
return false;
}
default:
// For unknown command types, be conservative and don't invalidate
console.warn(
`[UndoRedoStore] Unknown command type for invalidation: ${(cmd as Command).type}`,
);
return false;
}
};
// Apply filtering to both stacks
const originalUndoLength = stacks.undoStack.length;
const originalRedoLength = stacks.redoStack.length;
stacks.undoStack = stacks.undoStack.filter(
(cmd) => !shouldInvalidateCommand(cmd),
);
stacks.redoStack = stacks.redoStack.filter(
(cmd) => !shouldInvalidateCommand(cmd),
);
if (invalidatedCount > 0) {
this.saveAllStacks();
this.updateSnapshot();
this.emit();
} else {
// console.log(`[UndoRedoStore] Smart invalidation: No commands needed to be removed for objects:`, deletedObjectIds);
}
}
/**
* Validate if a command can still be executed (for soft delete scenarios)
* This can be called before executing commands to provide better error handling
*/
canExecuteCommand(command: Command): {
canExecute: boolean;
reason?: string;
} {
switch (command.type) {
case "MOVE":
// For move commands, we need to check if the graphic object still exists
// This is handled in the CommandExecutor with pre-validation
return { canExecute: true };
case "DELETE":
// Delete commands can usually be undone via restore operations
return { canExecute: true };
case "CONNECT":
case "DISCONNECT":
// Connection commands depend on port/stream availability
// Better to attempt and handle gracefully than pre-validate
return { canExecute: true };
case "MERGE_STREAMS":
// Merge commands have complex restoration logic
// Let the executor handle validation
return { canExecute: true };
default:
return {
canExecute: false,
reason: `Unknown command type: ${(command as Command).type}`,
};
}
}
// ---- Storage Implementation ----
private saveAllStacks(): void {
try {
const flowsheetsObject: FlowsheetStacks = {};
this.stacksByFlowsheet.forEach((stacks, flowsheetId) => {
flowsheetsObject[flowsheetId] = stacks;
});
const serializedData = SuperJSON.stringify(flowsheetsObject);
localStorage.setItem(this.storageKey, serializedData);
} catch (error) {
console.warn("[UndoRedoStore] Failed to save to localStorage:", error);
}
}
private loadAllStacks(): void {
try {
const serializedData = localStorage.getItem(this.storageKey);
if (serializedData) {
const allStacksData = SuperJSON.parse<FlowsheetStacks>(serializedData);
this.stacksByFlowsheet.clear();
for (const flowsheetId in allStacksData) {
if (
Object.prototype.hasOwnProperty.call(allStacksData, flowsheetId)
) {
const stacks = allStacksData[flowsheetId];
this.stacksByFlowsheet.set(flowsheetId, {
undoStack: stacks.undoStack || [],
redoStack: stacks.redoStack || [],
});
}
}
}
} catch (error) {
console.warn("[UndoRedoStore] Failed to load from localStorage:", error);
this.stacksByFlowsheet.clear();
}
}
// ---- Debug and Utility Methods ----
getDebugInfo(): {
currentFlowsheet: string | null;
undoCount: number;
redoCount: number;
lastCommand?: Command;
allFlowsheets: string[];
} {
const undoCount = this.getUndoStackSize();
const redoCount = this.getRedoStackSize();
let lastCommand: Command | undefined;
Iif (this.currentFlowsheet) {
const stacks = this.stacksByFlowsheet.get(this.currentFlowsheet);
Iif (stacks && stacks.undoStack.length > 0) {
lastCommand = stacks.undoStack[stacks.undoStack.length - 1];
}
}
return {
currentFlowsheet: this.currentFlowsheet,
undoCount,
redoCount,
lastCommand,
allFlowsheets: Array.from(this.stacksByFlowsheet.keys()),
};
}
}
// Export singleton instance
export const undoRedoStore = new UndoRedoStore();
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