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import { useCallback, useEffect, useMemo, useState } from "react";
import type { CanvasComponent } from "@/types/canvas";
export interface UseCanvasStateResult {
components: CanvasComponent[];
selectedComponentId: string | null;
selectedComponent: CanvasComponent | null;
setComponents: Dispatch<SetStateAction<CanvasComponent[]>>;
addComponent: (component: CanvasComponent) => void;
updateComponent: (id: string, updates: Partial<CanvasComponent>) => void;
removeComponent: (id: string) => void;
addChild: (parentId: string, childId: string) => void;
removeChild: (parentId: string, childId: string) => void;
getChildren: (componentId: string) => CanvasComponent[];
getRootComponents: () => CanvasComponent[];
selectComponent: (id: string | null) => void;
}
export function useCanvasState(initialComponents: CanvasComponent[] = []): UseCanvasStateResult {
const [components, setComponents] = useState<CanvasComponent[]>(initialComponents);
const [selectedComponentId, setSelectedComponentId] = useState<string | null>(null);
const addComponent = useCallback((component: CanvasComponent) => {
setComponents((previous) => [...previous, component]);
}, []);
const updateComponent = useCallback((id: string, updates: Partial<CanvasComponent>) => {
setComponents((previous) =>
previous.map((component) => (component.id === id ? { ...component, ...updates } : component)),
);
}, []);
const removeComponent = useCallback((id: string) => {
setComponents((previous) =>
previous
.filter((component) => component.id !== id)
.map((component) => {
let nextComponent = component;
if (nextComponent.parentId === id) {
nextComponent = { ...nextComponent };
delete nextComponent.parentId;
}
if (nextComponent.children?.includes(id)) {
nextComponent = {
...nextComponent,
children: nextComponent.children.filter((childId) => childId !== id),
};
}
return nextComponent;
}),
);
setSelectedComponentId((previous) => (previous === id ? null : previous));
}, []);
const addChild = useCallback((parentId: string, childId: string) => {
if (parentId === childId) {
return;
}
setComponents((previous) => {
const parent = previous.find((component) => component.id === parentId);
const child = previous.find((component) => component.id === childId);
if (!parent || !child) {
return previous;
}
const parentChildren = parent.children ?? [];
const shouldAddChildToParent = !parentChildren.includes(childId);
const shouldUpdateChildParent = child.parentId !== parentId;
const previousParentId = child.parentId;
const shouldDetachFromPreviousParent =
previousParentId !== undefined && previousParentId !== parentId;
if (!shouldAddChildToParent && !shouldUpdateChildParent && !shouldDetachFromPreviousParent) {
return previous;
}
return previous.map((component) => {
if (component.id === parentId && shouldAddChildToParent) {
return {
...component,
children: [...parentChildren, childId],
};
}
if (shouldDetachFromPreviousParent && component.id === previousParentId) {
return {
...component,
children: (component.children ?? []).filter((id) => id !== childId),
};
}
if (component.id === childId && shouldUpdateChildParent) {
return {
...component,
parentId,
};
}
return component;
});
});
}, []);
const removeChild = useCallback((parentId: string, childId: string) => {
setComponents((previous) => {
const parent = previous.find((component) => component.id === parentId);
const child = previous.find((component) => component.id === childId);
if (!parent || !child) {
return previous;
}
const parentChildren = parent.children ?? [];
const shouldRemoveChildFromParent = parentChildren.includes(childId);
const shouldClearChildParent = child.parentId === parentId;
if (!shouldRemoveChildFromParent && !shouldClearChildParent) {
return previous;
}
return previous.map((component) => {
if (component.id === parentId && shouldRemoveChildFromParent) {
return {
...component,
children: parentChildren.filter((id) => id !== childId),
};
}
if (component.id === childId && shouldClearChildParent) {
const childWithoutParent = { ...component };
delete childWithoutParent.parentId;
return childWithoutParent;
}
return component;
});
});
}, []);
const getChildren = useCallback(
(componentId: string) => {
const parent = components.find((component) => component.id === componentId);
if (!parent) {
return [];
}
const componentsById = new Map(components.map((component) => [component.id, component]));
const orderedChildren = (parent.children ?? [])
.map((childId) => componentsById.get(childId))
.filter((child): child is CanvasComponent => child !== undefined);
const knownChildIds = new Set(orderedChildren.map((child) => child.id));
const parentBasedChildren = components.filter(
(component) => component.parentId === componentId && !knownChildIds.has(component.id),
);
return [...orderedChildren, ...parentBasedChildren];
},
[components],
);
const getRootComponents = useCallback(() => {
const componentIds = new Set(components.map((component) => component.id));
return components.filter(
(component) => !component.parentId || !componentIds.has(component.parentId),
);
}, [components]);
const selectComponent = useCallback(
(id: string | null) => {
if (id === null) {
setSelectedComponentId(null);
return;
}
if (components.some((component) => component.id === id)) {
setSelectedComponentId(id);
}
},
[components],
);
useEffect(() => {
if (
selectedComponentId &&
!components.some((component) => component.id === selectedComponentId)
) {
setSelectedComponentId(null);
}
}, [components, selectedComponentId]);
const selectedComponent = useMemo(
() => components.find((component) => component.id === selectedComponentId) ?? null,
[components, selectedComponentId],
);
return {
components,
selectedComponentId,
selectedComponent,
setComponents,
addComponent,
updateComponent,
removeComponent,
addChild,
removeChild,
getChildren,
getRootComponents,
selectComponent,
};
}
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