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import { useState, useEffect } from "react";
import { ResizeState, TimelineElement, TimelineTrack } from "@/types/timeline";
import { useMediaStore } from "@/stores/media-store";
import { useTimelineStore } from "@/stores/timeline-store";
interface UseTimelineElementResizeProps {
element: TimelineElement;
track: TimelineTrack;
zoomLevel: number;
onUpdateTrim: (
trackId: string,
elementId: string,
trimStart: number,
trimEnd: number
) => void;
onUpdateDuration: (
trackId: string,
elementId: string,
duration: number
) => void;
}
export function useTimelineElementResize({
element,
track,
zoomLevel,
onUpdateTrim,
onUpdateDuration,
}: UseTimelineElementResizeProps) {
const [resizing, setResizing] = useState<ResizeState | null>(null);
const { mediaItems } = useMediaStore();
const {
updateElementStartTime,
updateElementTrim,
updateElementDuration,
pushHistory,
} = useTimelineStore();
// Set up document-level mouse listeners during resize (like proper drag behavior)
useEffect(() => {
if (!resizing) return;
const handleDocumentMouseMove = (e: MouseEvent) => {
updateTrimFromMouseMove({ clientX: e.clientX });
};
const handleDocumentMouseUp = () => {
handleResizeEnd();
};
// Add document-level listeners for proper drag behavior
document.addEventListener("mousemove", handleDocumentMouseMove);
document.addEventListener("mouseup", handleDocumentMouseUp);
return () => {
document.removeEventListener("mousemove", handleDocumentMouseMove);
document.removeEventListener("mouseup", handleDocumentMouseUp);
};
}, [resizing]); // Re-run when resizing state changes
const handleResizeStart = (
e: React.MouseEvent,
elementId: string,
side: "left" | "right"
) => {
e.stopPropagation();
e.preventDefault();
// Push history once at the start of the resize operation
pushHistory();
setResizing({
elementId,
side,
startX: e.clientX,
initialTrimStart: element.trimStart,
initialTrimEnd: element.trimEnd,
});
};
const canExtendElementDuration = () => {
// Text elements can always be extended
if (element.type === "text") {
return true;
}
// Media elements - check the media type
if (element.type === "media") {
const mediaItem = mediaItems.find((item) => item.id === element.mediaId);
if (!mediaItem) return false;
// Images can be extended (static content)
if (mediaItem.type === "image") {
return true;
}
// Videos and audio cannot be extended beyond their natural duration
// (no additional content exists)
return false;
}
return false;
};
const updateTrimFromMouseMove = (e: { clientX: number }) => {
if (!resizing) return;
const deltaX = e.clientX - resizing.startX;
// Reasonable sensitivity for resize operations - similar to timeline scale
const deltaTime = deltaX / (50 * zoomLevel);
if (resizing.side === "left") {
// Left resize - different behavior for media vs text/image elements
const maxAllowed = element.duration - resizing.initialTrimEnd - 0.1;
const calculated = resizing.initialTrimStart + deltaTime;
if (calculated >= 0) {
// Normal trimming within available content
const newTrimStart = Math.min(maxAllowed, calculated);
const trimDelta = newTrimStart - resizing.initialTrimStart;
const newStartTime = element.startTime + trimDelta;
updateElementTrim(
track.id,
element.id,
newTrimStart,
resizing.initialTrimEnd,
false
);
updateElementStartTime(track.id, element.id, newStartTime, false);
} else {
// Trying to extend beyond trimStart = 0
if (canExtendElementDuration()) {
// Text/Image: extend element to the left by moving startTime and increasing duration
const extensionAmount = Math.abs(calculated);
const maxExtension = element.startTime;
const actualExtension = Math.min(extensionAmount, maxExtension);
const newStartTime = element.startTime - actualExtension;
const newDuration = element.duration + actualExtension;
// Keep trimStart at 0 and extend the element
updateElementTrim(
track.id,
element.id,
0,
resizing.initialTrimEnd,
false
);
updateElementDuration(track.id, element.id, newDuration, false);
updateElementStartTime(track.id, element.id, newStartTime, false);
} else {
// Video/Audio: can't extend beyond original content - limit to trimStart = 0
const newTrimStart = 0;
const trimDelta = newTrimStart - resizing.initialTrimStart;
const newStartTime = element.startTime + trimDelta;
updateElementTrim(
track.id,
element.id,
newTrimStart,
resizing.initialTrimEnd,
false
);
updateElementStartTime(track.id, element.id, newStartTime, false);
}
}
} else {
// Right resize - can extend duration for supported element types
const calculated = resizing.initialTrimEnd - deltaTime;
if (calculated < 0) {
// We're trying to extend beyond original duration
if (canExtendElementDuration()) {
// Extend the duration instead of reducing trimEnd further
const extensionNeeded = Math.abs(calculated);
const newDuration = element.duration + extensionNeeded;
const newTrimEnd = 0; // Reset trimEnd to 0 since we're extending
// Update duration first, then trim
updateElementDuration(track.id, element.id, newDuration, false);
updateElementTrim(
track.id,
element.id,
resizing.initialTrimStart,
newTrimEnd,
false
);
} else {
// Can't extend - just set trimEnd to 0 (maximum possible extension)
updateElementTrim(
track.id,
element.id,
resizing.initialTrimStart,
0,
false
);
}
} else {
// Normal trimming within original duration
const maxTrimEnd = element.duration - resizing.initialTrimStart - 0.1; // Leave at least 0.1s visible
const newTrimEnd = Math.max(0, Math.min(maxTrimEnd, calculated));
updateElementTrim(
track.id,
element.id,
resizing.initialTrimStart,
newTrimEnd,
false
);
}
}
};
const handleResizeEnd = () => {
setResizing(null);
};
return {
resizing,
isResizing: resizing !== null,
handleResizeStart,
// Return empty handlers since we use document listeners now
handleResizeMove: () => {}, // Not used anymore
handleResizeEnd: () => {}, // Not used anymore
};
}
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