'use client';

import * as React from 'react';
import { cn } from '@/lib/utils/cn';
import type { AutomationPoint as AutomationPointType } from '@/types/automation';

export interface AutomationPointProps {
  point: AutomationPointType;
  x: number; // Pixel position
  y: number; // Pixel position
  isSelected?: boolean;
  onDragStart?: (pointId: string, startX: number, startY: number) => void;
  onDrag?: (pointId: string, deltaX: number, deltaY: number) => void;
  onDragEnd?: (pointId: string) => void;
  onClick?: (pointId: string, event: React.MouseEvent) => void;
  onDoubleClick?: (pointId: string) => void;
}

export function AutomationPoint({
  point,
  x,
  y,
  isSelected = false,
  onDragStart,
  onDrag,
  onDragEnd,
  onClick,
  onDoubleClick,
}: AutomationPointProps) {
  const [isDragging, setIsDragging] = React.useState(false);
  const dragStartRef = React.useRef({ x: 0, y: 0 });

  const handleMouseDown = React.useCallback(
    (e: React.MouseEvent) => {
      if (e.button !== 0) return; // Only left click

      e.stopPropagation();
      setIsDragging(true);
      dragStartRef.current = { x: e.clientX, y: e.clientY };

      if (onDragStart) {
        onDragStart(point.id, e.clientX, e.clientY);
      }
    },
    [point.id, onDragStart]
  );

  const handleClick = React.useCallback(
    (e: React.MouseEvent) => {
      if (!isDragging && onClick) {
        onClick(point.id, e);
      }
    },
    [isDragging, point.id, onClick]
  );

  const handleDoubleClick = React.useCallback(
    (e: React.MouseEvent) => {
      e.stopPropagation();
      if (onDoubleClick) {
        onDoubleClick(point.id);
      }
    },
    [point.id, onDoubleClick]
  );

  // Global mouse handlers
  React.useEffect(() => {
    if (!isDragging) return;

    const handleMouseMove = (e: MouseEvent) => {
      if (!isDragging) return;

      const deltaX = e.clientX - dragStartRef.current.x;
      const deltaY = e.clientY - dragStartRef.current.y;

      if (onDrag) {
        onDrag(point.id, deltaX, deltaY);
      }

      // Update drag start position for next delta calculation
      dragStartRef.current = { x: e.clientX, y: e.clientY };
    };

    const handleMouseUp = () => {
      if (isDragging) {
        setIsDragging(false);
        if (onDragEnd) {
          onDragEnd(point.id);
        }
      }
    };

    window.addEventListener('mousemove', handleMouseMove);
    window.addEventListener('mouseup', handleMouseUp);

    return () => {
      window.removeEventListener('mousemove', handleMouseMove);
      window.removeEventListener('mouseup', handleMouseUp);
    };
  }, [isDragging, point.id, onDrag, onDragEnd]);

  return (
    <div
      className={cn(
        'absolute rounded-full cursor-pointer transition-all select-none',
        'hover:scale-125',
        isDragging ? 'scale-125 z-10' : 'z-0',
        isSelected
          ? 'w-3 h-3 bg-primary border-2 border-background shadow-lg'
          : 'w-2.5 h-2.5 bg-primary/80 border border-background shadow-md'
      )}
      style={{
        left: x - (isSelected || isDragging ? 6 : 5),
        top: y - (isSelected || isDragging ? 6 : 5),
      }}
      onMouseDown={handleMouseDown}
      onClick={handleClick}
      onDoubleClick={handleDoubleClick}
      title={`Time: ${point.time.toFixed(3)}s, Value: ${point.value.toFixed(3)}`}
    />
  );
}