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import { useState, useRef, useCallback } from 'react';
import { CanvasObject, CanvasSize, CanvasBgColor } from '../types/canvas.types';
import { generateId, getNextZIndex } from '../utils/canvas.utils';
// Distributed Omit type for union types
type DistributiveOmit<T, K extends keyof any> = T extends any ? Omit<T, K> : never;
const MAX_HISTORY_SIZE = 50;
export function useCanvasState() {
const [objects, setObjectsState] = useState<CanvasObject[]>([]);
const [selectedIds, setSelectedIds] = useState<string[]>([]);
const [canvasSize, setCanvasSize] = useState<CanvasSize>('1200x675');
const [bgColor, setBgColor] = useState<CanvasBgColor>('seriousLight');
// History management - store complete state snapshots
const history = useRef<CanvasObject[][]>([[]]); // Start with empty canvas
const historyIndex = useRef<number>(0);
const isApplyingHistory = useRef<boolean>(false);
const skipHistoryRecording = useRef<boolean>(false); // Flag to skip history for text editing
// Set objects with history tracking
const setObjects = useCallback((newObjects: CanvasObject[]) => {
setObjectsState(newObjects);
// Don't record history during undo/redo operations
if (isApplyingHistory.current) {
return;
}
// Use setTimeout to ensure state has been updated before recording
setTimeout(() => {
// Check skip flag inside setTimeout to catch updates
if (skipHistoryRecording.current) {
return;
}
// Remove any future history if we're not at the end
if (historyIndex.current < history.current.length - 1) {
history.current = history.current.slice(0, historyIndex.current + 1);
}
// Deep clone and normalize state (remove isEditing flag for comparison)
const normalizeState = (state: CanvasObject[]) => {
return state.map((obj: CanvasObject) => {
if (obj.type === 'text') {
const { isEditing, ...rest } = obj as any;
return rest;
}
return obj;
});
};
const normalizedNewState = normalizeState(newObjects);
const normalizedCurrentState = history.current[historyIndex.current]
? normalizeState(history.current[historyIndex.current])
: [];
// Only add to history if state actually changed (ignoring isEditing)
const stateChanged = JSON.stringify(normalizedCurrentState) !== JSON.stringify(normalizedNewState);
if (stateChanged) {
// Store the normalized state (without isEditing)
const stateCopy = JSON.parse(JSON.stringify(normalizedNewState));
history.current.push(stateCopy);
historyIndex.current++;
// Limit history size
if (history.current.length > MAX_HISTORY_SIZE) {
history.current.shift();
historyIndex.current--;
}
}
}, 0);
}, []);
// Undo function
const undo = useCallback(() => {
if (historyIndex.current > 0) {
isApplyingHistory.current = true;
historyIndex.current--;
const previousState = JSON.parse(JSON.stringify(history.current[historyIndex.current]));
// Recalculate text dimensions for text objects to fix clipping issues
const recalculatedState = previousState.map((obj: CanvasObject) => {
if (obj.type === 'text' && obj.text) {
try {
const Konva = require('konva').default;
const tempText = new Konva.Text({
text: obj.text,
fontSize: obj.fontSize,
fontFamily: obj.fontFamily,
fontStyle: `${obj.bold ? 'bold' : 'normal'} ${obj.italic ? 'italic' : ''}`
});
const newWidth = Math.max(100, tempText.width() + 20);
const newHeight = Math.max(40, tempText.height() + 10);
tempText.destroy();
// Always recalculate to ensure proper fit
return { ...obj, width: newWidth, height: newHeight, isEditing: false };
} catch (error) {
console.error('Error recalculating text dimensions:', error);
return obj;
}
}
return obj;
});
setObjectsState(recalculatedState);
setSelectedIds([]); // Deselect when undoing
// Reset flag after state update
setTimeout(() => {
isApplyingHistory.current = false;
}, 0);
}
}, []);
// Redo function
const redo = useCallback(() => {
if (historyIndex.current < history.current.length - 1) {
isApplyingHistory.current = true;
historyIndex.current++;
const nextState = JSON.parse(JSON.stringify(history.current[historyIndex.current]));
// Recalculate text dimensions for text objects to fix clipping issues
const recalculatedState = nextState.map((obj: CanvasObject) => {
if (obj.type === 'text' && obj.text) {
try {
const Konva = require('konva').default;
const tempText = new Konva.Text({
text: obj.text,
fontSize: obj.fontSize,
fontFamily: obj.fontFamily,
fontStyle: `${obj.bold ? 'bold' : 'normal'} ${obj.italic ? 'italic' : ''}`
});
const newWidth = Math.max(100, tempText.width() + 20);
const newHeight = Math.max(40, tempText.height() + 10);
tempText.destroy();
// Always recalculate to ensure proper fit
return { ...obj, width: newWidth, height: newHeight, isEditing: false };
} catch (error) {
console.error('Error recalculating text dimensions:', error);
return obj;
}
}
return obj;
});
setObjectsState(recalculatedState);
setSelectedIds([]); // Deselect when redoing
// Reset flag after state update
setTimeout(() => {
isApplyingHistory.current = false;
}, 0);
}
}, []);
// Add object to canvas
const addObject = (obj: DistributiveOmit<CanvasObject, 'id' | 'zIndex'>) => {
const newObject: CanvasObject = {
...obj,
id: generateId(),
zIndex: getNextZIndex(objects)
} as CanvasObject;
setObjects([...objects, newObject]);
setSelectedIds([newObject.id]);
};
// Delete selected objects
const deleteSelected = () => {
if (selectedIds.length > 0) {
setObjects(objects.filter(obj => !selectedIds.includes(obj.id)));
setSelectedIds([]);
}
};
// Update selected objects
const updateSelected = (updates: Partial<CanvasObject>) => {
if (selectedIds.length > 0) {
setObjects(objects.map(obj =>
selectedIds.includes(obj.id) ? { ...obj, ...updates } as CanvasObject : obj
));
}
};
// Bring to front
const bringToFront = (id: string) => {
const maxZ = getNextZIndex(objects);
setObjects(objects.map(obj =>
obj.id === id ? { ...obj, zIndex: maxZ } : obj
));
};
// Send to back
const sendToBack = (id: string) => {
const minZ = Math.min(...objects.map(obj => obj.zIndex));
setObjects(objects.map(obj =>
obj.id === id ? { ...obj, zIndex: minZ - 1 } : obj
));
};
// Move forward
const moveForward = (id: string) => {
const obj = objects.find(o => o.id === id);
if (!obj) return;
const objectsAbove = objects.filter(o => o.zIndex > obj.zIndex);
if (objectsAbove.length === 0) return;
const nextZ = Math.min(...objectsAbove.map(o => o.zIndex));
setObjects(objects.map(o =>
o.id === id ? { ...o, zIndex: nextZ + 0.5 } : o
));
};
// Move backward
const moveBackward = (id: string) => {
const obj = objects.find(o => o.id === id);
if (!obj) return;
const objectsBelow = objects.filter(o => o.zIndex < obj.zIndex);
if (objectsBelow.length === 0) return;
const prevZ = Math.max(...objectsBelow.map(o => o.zIndex));
setObjects(objects.map(o =>
o.id === id ? { ...o, zIndex: prevZ - 0.5 } : o
));
};
// Enable/disable history recording (for text editing)
const setSkipHistoryRecording = useCallback((skip: boolean) => {
skipHistoryRecording.current = skip;
}, []);
return {
objects,
selectedIds,
canvasSize,
bgColor,
setObjects,
setSelectedIds,
setCanvasSize,
setBgColor,
addObject,
deleteSelected,
updateSelected,
bringToFront,
sendToBack,
moveForward,
moveBackward,
undo,
redo,
setSkipHistoryRecording
};
}
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