import React, { useState, useRef, useEffect } from 'react';
import { Rect } from '../types';

interface RiggingEditorProps {
  imageUrl: string;
  initialData?: { leftEye: Rect; rightEye: Rect; mouth: Rect; skinColor: string };
  onComplete: (data: { leftEye: Rect; rightEye: Rect; mouth: Rect; skinColor: string }) => void;
}

type ActiveFeature = 'leftEye' | 'rightEye' | 'mouth' | null;

const ResizableBox: React.FC<{
  rect: Rect;
  color: string;
  label: string;
  isActive: boolean;
  onUpdate: (rect: Rect) => void;
  onActivate: () => void;
}> = ({ rect, color, label, isActive, onUpdate, onActivate }) => {
  const boxRef = useRef<HTMLDivElement>(null);
  const [isDragging, setIsDragging] = useState(false);
  const [isResizing, setIsResizing] = useState(false);
  const startPos = useRef({ x: 0, y: 0 });
  const startRect = useRef<Rect>({ x: 0, y: 0, w: 0, h: 0 });

  const handleMouseDown = (e: React.MouseEvent) => {
    e.preventDefault();
    e.stopPropagation();
    onActivate();
    setIsDragging(true);
    startPos.current = { x: e.clientX, y: e.clientY };
    startRect.current = { ...rect };
  };

  const handleResizeDown = (e: React.MouseEvent) => {
    e.preventDefault();
    e.stopPropagation();
    onActivate();
    setIsResizing(true);
    startPos.current = { x: e.clientX, y: e.clientY };
    startRect.current = { ...rect };
  };

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

      const parent = boxRef.current?.parentElement;
      if (!parent) return;
      const parentRect = parent.getBoundingClientRect();

      const deltaX = (e.clientX - startPos.current.x) / parentRect.width;
      const deltaY = (e.clientY - startPos.current.y) / parentRect.height;

      if (isDragging) {
        onUpdate({
          ...rect,
          x: startRect.current.x + deltaX,
          y: startRect.current.y + deltaY,
        });
      } else if (isResizing) {
        onUpdate({
          ...rect,
          w: Math.max(0.01, startRect.current.w + deltaX),
          h: Math.max(0.01, startRect.current.h + deltaY),
        });
      }
    };

    const handleMouseUp = () => {
      setIsDragging(false);
      setIsResizing(false);
    };

    if (isDragging || isResizing) {
      window.addEventListener('mousemove', handleMouseMove);
      window.addEventListener('mouseup', handleMouseUp);
    }

    return () => {
      window.removeEventListener('mousemove', handleMouseMove);
      window.removeEventListener('mouseup', handleMouseUp);
    };
  }, [isDragging, isResizing, rect, onUpdate]);

  return (
    <div
      ref={boxRef}
      onMouseDown={handleMouseDown}
      className={`absolute border-2 cursor-move group transition-colors ${isActive ? 'z-20' : 'z-10'}`}
      style={{
        left: `${rect.x * 100}%`,
        top: `${rect.y * 100}%`,
        width: `${rect.w * 100}%`,
        height: `${rect.h * 100}%`,
        borderColor: color,
        backgroundColor: isActive ? `${color}20` : 'transparent',
      }}
    >
      {/* Label */}
      <div 
        className="absolute -top-6 left-0 text-xs font-bold px-1 rounded text-white whitespace-nowrap"
        style={{ backgroundColor: color }}
      >
        {label}
      </div>

      {/* Resize Handle */}
      <div
        onMouseDown={handleResizeDown}
        className="absolute bottom-0 right-0 w-4 h-4 bg-white border-2 cursor-nwse-resize opacity-0 group-hover:opacity-100 transition-opacity"
        style={{ borderColor: color }}
      />
    </div>
  );
};

const RiggingEditor: React.FC<RiggingEditorProps> = ({ imageUrl, initialData, onComplete }) => {
  const [leftEye, setLeftEye] = useState<Rect>(initialData?.leftEye || { x: 0.35, y: 0.4, w: 0.12, h: 0.08 });
  const [rightEye, setRightEye] = useState<Rect>(initialData?.rightEye || { x: 0.53, y: 0.4, w: 0.12, h: 0.08 });
  const [mouth, setMouth] = useState<Rect>(initialData?.mouth || { x: 0.45, y: 0.6, w: 0.1, h: 0.05 });
  const [skinColor, setSkinColor] = useState<string>(initialData?.skinColor || '#fcd3bf');
  const [activeFeature, setActiveFeature] = useState<ActiveFeature>(null);

  return (
    <div className="flex flex-col items-center h-full max-w-4xl mx-auto p-4">
      <div className="text-center mb-6">
        <h2 className="text-2xl font-bold text-white mb-2">Rig Your Avatar</h2>
        <p className="text-slate-400">
          Drag and resize the boxes to match your avatar's features. 
          This ensures the eyes blink correctly.
        </p>
      </div>

      <div className="flex gap-8 w-full items-start">
        {/* Editor Area */}
        <div className="flex-1 bg-slate-800 p-4 rounded-xl border border-slate-700 flex justify-center">
          <div className="relative inline-block select-none" style={{ width: '500px', maxWidth: '100%' }}>
            <img 
              src={imageUrl} 
              alt="Rigging Target" 
              className="w-full h-auto rounded-lg pointer-events-none select-none block"
              draggable={false}
            />
            
            <ResizableBox 
              rect={leftEye} 
              color="#ef4444" // Red
              label="Left Eye" 
              isActive={activeFeature === 'leftEye'}
              onUpdate={setLeftEye}
              onActivate={() => setActiveFeature('leftEye')}
            />
            
            <ResizableBox 
              rect={rightEye} 
              color="#3b82f6" // Blue
              label="Right Eye" 
              isActive={activeFeature === 'rightEye'}
              onUpdate={setRightEye}
              onActivate={() => setActiveFeature('rightEye')}
            />
            
            <ResizableBox 
              rect={mouth} 
              color="#22c55e" // Green
              label="Mouth" 
              isActive={activeFeature === 'mouth'}
              onUpdate={setMouth}
              onActivate={() => setActiveFeature('mouth')}
            />
          </div>
        </div>

        {/* Sidebar Controls */}
        <div className="w-64 flex flex-col gap-6 bg-slate-800/50 p-6 rounded-xl border border-slate-700 h-full">
          
          <div>
            <label className="block text-sm font-medium text-slate-300 mb-2">Eyelid Color</label>
            <div className="flex items-center gap-3">
              <input 
                type="color" 
                value={skinColor}
                onChange={(e) => setSkinColor(e.target.value)}
                className="w-10 h-10 rounded cursor-pointer border-0 p-0"
              />
              <span className="text-xs text-slate-400 font-mono">{skinColor}</span>
            </div>
            <p className="text-xs text-slate-500 mt-2">
              Pick the color of the skin above the eyes for realistic blinking.
            </p>
          </div>

          <div className="space-y-2">
            <div className="flex items-center gap-2 text-sm text-slate-300">
              <div className="w-3 h-3 bg-red-500 rounded-full"></div>
              <span>Left Eye Box</span>
            </div>
            <div className="flex items-center gap-2 text-sm text-slate-300">
              <div className="w-3 h-3 bg-blue-500 rounded-full"></div>
              <span>Right Eye Box</span>
            </div>
             <div className="flex items-center gap-2 text-sm text-slate-300">
              <div className="w-3 h-3 bg-green-500 rounded-full"></div>
              <span>Mouth Box</span>
            </div>
          </div>

          <div className="mt-auto pt-6">
            <button
              onClick={() => onComplete({ leftEye, rightEye, mouth, skinColor })}
              className="w-full py-3 bg-gradient-to-r from-cyan-500 to-blue-600 hover:from-cyan-400 hover:to-blue-500 text-white rounded-xl font-bold shadow-lg shadow-cyan-500/25 transform hover:scale-[1.02] transition-all"
            >
              Finish Rigging
            </button>
          </div>
        </div>
      </div>
    </div>
  );
};

export default RiggingEditor;