paint-ui/components/transform/transform-panel.tsx

'use client';

import { useTransformStore } from '@/store/transform-store';
import { useLayerStore } from '@/store/layer-store';
import { useHistoryStore } from '@/store/history-store';
import { useToolStore } from '@/store/tool-store';
import { TransformCommand } from '@/core/commands/transform-command';
import { Move, RotateCw, Maximize2, Check, X, Lock, Unlock } from 'lucide-react';
import { cn } from '@/lib/utils';

export function TransformPanel() {
  const {
    activeTransform,
    transformType,
    maintainAspectRatio,
    setTransformType,
    setMaintainAspectRatio,
    applyTransform,
    cancelTransform,
  } = useTransformStore();

  const { activeLayerId, layers } = useLayerStore();
  const { executeCommand } = useHistoryStore();
  const { setActiveTool } = useToolStore();

  const activeLayer = layers.find((l) => l.id === activeLayerId);
  const hasActiveLayer = !!activeLayer && !activeLayer.locked;

  const handleApply = () => {
    if (!activeTransform || !activeLayer) return;

    const command = TransformCommand.applyToLayer(
      activeLayer,
      activeTransform.currentState,
      activeTransform.originalBounds
    );
    executeCommand(command);
    applyTransform();
  };

  const handleCancel = () => {
    cancelTransform();
  };

  const handleMoveTool = () => {
    setActiveTool('move');
  };

  const handleTransformTool = () => {
    setActiveTool('move'); // Will be updated to 'transform' when tool types are updated
  };

  return (
    <div className="w-full border-l border-border bg-card flex flex-col">
      {/* Transform Tools */}
      <div className="border-b border-border p-3">
        <h3 className="text-xs font-semibold text-muted-foreground uppercase mb-2">
          Tools
        </h3>
        <div className="space-y-1">
          <button
            onClick={handleMoveTool}
            disabled={!hasActiveLayer}
            className={cn(
              'w-full flex items-center gap-2 rounded-md p-2 text-sm transition-colors',
              transformType === 'move'
                ? 'bg-primary text-primary-foreground'
                : 'hover:bg-accent text-foreground',
              !hasActiveLayer && 'opacity-50 cursor-not-allowed'
            )}
          >
            <Move className="h-4 w-4" />
            <span>Move Layer</span>
          </button>

          <button
            onClick={handleTransformTool}
            disabled={!hasActiveLayer}
            className={cn(
              'w-full flex items-center gap-2 rounded-md p-2 text-sm transition-colors',
              transformType === 'free-transform'
                ? 'bg-primary text-primary-foreground'
                : 'hover:bg-accent text-foreground',
              !hasActiveLayer && 'opacity-50 cursor-not-allowed'
            )}
          >
            <Maximize2 className="h-4 w-4" />
            <span>Free Transform</span>
          </button>
        </div>
      </div>

      {/* Transform Options */}
      {activeTransform && (
        <div className="border-b border-border p-3 space-y-3">
          <h3 className="text-xs font-semibold text-muted-foreground uppercase">
            Options
          </h3>

          {/* Maintain Aspect Ratio */}
          <button
            onClick={() => setMaintainAspectRatio(!maintainAspectRatio)}
            className="w-full flex items-center justify-between rounded-md p-2 hover:bg-accent transition-colors"
          >
            <div className="flex items-center gap-2">
              {maintainAspectRatio ? (
                <Lock className="h-4 w-4" />
              ) : (
                <Unlock className="h-4 w-4" />
              )}
              <span className="text-sm">Constrain Proportions</span>
            </div>
            {maintainAspectRatio && (
              <div className="h-2 w-2 rounded-full bg-primary" />
            )}
          </button>

          {/* Transform State Display */}
          <div className="space-y-2 text-xs">
            <div className="flex justify-between">
              <span className="text-muted-foreground">Position:</span>
              <span>
                {Math.round(activeTransform.currentState.x)},{' '}
                {Math.round(activeTransform.currentState.y)}
              </span>
            </div>
            <div className="flex justify-between">
              <span className="text-muted-foreground">Scale:</span>
              <span>
                {(activeTransform.currentState.scaleX * 100).toFixed(0)}% ×{' '}
                {(activeTransform.currentState.scaleY * 100).toFixed(0)}%
              </span>
            </div>
            <div className="flex justify-between">
              <span className="text-muted-foreground">Rotation:</span>
              <span>{activeTransform.currentState.rotation.toFixed(1)}°</span>
            </div>
          </div>

          {/* Apply/Cancel Buttons */}
          <div className="flex gap-2 pt-2">
            <button
              onClick={handleApply}
              className="flex-1 flex items-center justify-center gap-2 rounded-md bg-primary p-2 text-sm font-medium text-primary-foreground hover:bg-primary/90 transition-colors"
            >
              <Check className="h-4 w-4" />
              Apply
            </button>
            <button
              onClick={handleCancel}
              className="flex-1 flex items-center justify-center gap-2 rounded-md bg-muted p-2 text-sm font-medium text-muted-foreground hover:bg-muted/80 transition-colors"
            >
              <X className="h-4 w-4" />
              Cancel
            </button>
          </div>
        </div>
      )}

      {/* Instructions */}
      <div className="flex-1 overflow-y-auto p-3">
        <h3 className="text-xs font-semibold text-muted-foreground uppercase mb-2">
          Instructions
        </h3>
        <div className="space-y-2 text-xs text-muted-foreground">
          {transformType === 'move' && (
            <>
              <p>• Click and drag to move the layer</p>
              <p>• Arrow keys for precise movement</p>
              <p>• Hold Shift for 10px increments</p>
            </>
          )}
          {transformType === 'free-transform' && (
            <>
              <p>• Drag corners to scale</p>
              <p>• Drag edges to scale in one direction</p>
              <p>• Drag rotate handle to rotate</p>
              <p>• Drag inside to move</p>
              <p>• Hold Shift to constrain proportions</p>
            </>
          )}
        </div>
      </div>

      {!hasActiveLayer && (
        <div className="p-3 border-t border-border">
          <p className="text-xs text-muted-foreground text-center">
            Select an unlocked layer to transform
          </p>
        </div>
      )}
    </div>
  );
}