'use client';

import { useState, useEffect, useRef } from 'react';
import { Item } from '@/lib/db';
import { X } from 'lucide-react';

interface DebugRotationPanelProps {
  item: Item;
  imageUrl: string;
  originalPhotoPath?: string;
  originalCropBounds?: { x: number; y: number; width: number; height: number };
  originalRotation?: number;
  imageProcessing?: any;
  onClose: () => void;
}

export function DebugRotationPanel({
  item,
  imageUrl,
  originalPhotoPath,
  originalCropBounds,
  originalRotation = 0,
  imageProcessing,
  onClose,
}: DebugRotationPanelProps) {
  const [rotation, setRotation] = useState(originalRotation);
  const canvasRef = useRef<HTMLCanvasElement>(null);
  const [log, setLog] = useState('');
  const imageRef = useRef<HTMLImageElement | null>(null);
  const [imageLoaded, setImageLoaded] = useState(false);
  const [scaledDimensions, setScaledDimensions] = useState({ width: 0, height: 0, scale: 1 });
  const containerRef = useRef<HTMLDivElement>(null);

  // Use original photo path if available, otherwise fall back to processed image URL
  const displayImageUrl = originalPhotoPath ? originalPhotoPath : imageUrl;

  const commonAngles = [
    { label: '0°', value: 0 },
    { label: '+22°', value: 22 },
    { label: '-22°', value: -22 },
    { label: '+45°', value: 45 },
    { label: '-45°', value: -45 },
    { label: '+90°', value: 90 },
    { label: '-90°', value: -90 },
    { label: '±180°', value: 180 },
  ];

  const updateLog = (message: string) => {
    setLog(message);
  };

  useEffect(() => {
    const img = new Image();
    img.crossOrigin = 'anonymous';
    img.onload = () => {
      imageRef.current = img;
      setImageLoaded(true);

      // Calculate scaled dimensions to fit available space (much larger)
      const maxWidth = 900;
      const maxHeight = 600;
      const scale = Math.min(maxWidth / img.width, maxHeight / img.height);
      const scaledW = img.width * scale;
      const scaledH = img.height * scale;
      setScaledDimensions({ width: scaledW, height: scaledH, scale });
      updateLog(`📸 ${img.width}×${img.height}px → scaled ${scaledW.toFixed(0)}×${scaledH.toFixed(0)}px (${scale.toFixed(2)}x)`);
    };
    img.onerror = () => updateLog('❌ Failed to load image');
    img.src = displayImageUrl;
  }, [displayImageUrl]);

  useEffect(() => {
    if (!imageLoaded || !imageRef.current || !canvasRef.current || !originalCropBounds) return;

    const canvas = canvasRef.current;
    const ctx = canvas.getContext('2d');
    if (!ctx) return;

    const img = imageRef.current;
    const { scale } = scaledDimensions;

    // Set canvas size to match scaled image
    canvas.width = scaledDimensions.width;
    canvas.height = scaledDimensions.height;

    // Draw scaled image
    ctx.drawImage(img, 0, 0, canvas.width, canvas.height);

    // Calculate crop box in scaled coordinates
    const cropX = originalCropBounds.x * scale;
    const cropY = originalCropBounds.y * scale;
    const cropW = originalCropBounds.width * scale;
    const cropH = originalCropBounds.height * scale;

    // Save state
    ctx.save();

    // Draw crop bounds rectangle (bright green)
    ctx.strokeStyle = '#00FF00';
    ctx.lineWidth = 4;
    ctx.shadowColor = 'rgba(0, 0, 0, 0.8)';
    ctx.shadowBlur = 3;
    ctx.strokeRect(cropX, cropY, cropW, cropH);

    // Draw rotation indicator (rotated rectangle inside crop area)
    if (Math.abs(rotation) > 0.5) {
      ctx.strokeStyle = '#FFB800';
      ctx.lineWidth = 3;
      ctx.setLineDash([5, 5]);
      ctx.shadowColor = 'rgba(0, 0, 0, 0.8)';
      ctx.shadowBlur = 2;

      // Draw a rotated rectangle showing where text will be after rotation
      ctx.save();
      ctx.translate(cropX + cropW / 2, cropY + cropH / 2);
      ctx.rotate((rotation * Math.PI) / 180);
      ctx.strokeRect(-cropW / 2, -cropH / 2, cropW, cropH);
      ctx.restore();
    }

    ctx.restore();

    // Update log with current state
    const logText = `Rotation: ${rotation}° | Crop: (${cropX.toFixed(0)}, ${cropY.toFixed(0)}) ${cropW.toFixed(0)}×${cropH.toFixed(0)}px`;
    updateLog(logText);
  }, [imageLoaded, rotation, originalCropBounds, scaledDimensions]);

  return (
    <div className="fixed inset-0 bg-black/80 flex items-center justify-center z-50 p-4">
      <div className="bg-slate-900 border border-slate-700 rounded-lg shadow-2xl max-w-6xl w-full max-h-[95vh] overflow-hidden flex flex-col">
        {/* Header */}
        <div className="p-3 border-b border-slate-700 flex items-center justify-between bg-slate-800 flex-shrink-0">
          <h2 className="text-lg font-normal text-white">Debug Rotation & Crop</h2>
          <button
            onClick={onClose}
            className="p-2 hover:bg-slate-700 rounded text-gray-400 hover:text-white transition"
          >
            <X size={20} />
          </button>
        </div>

        <div className="flex gap-4 p-4 flex-1 overflow-hidden">
          {/* Left: Controls */}
          <div className="w-48 bg-slate-800 p-3 rounded space-y-4 flex-shrink-0 overflow-y-auto">
            {/* Rotation Slider */}
            <div>
              <label className="block text-sm font-normal text-white mb-2">
                Rotation: <span className="text-yellow-400">{rotation}°</span>
              </label>
              <input
                type="range"
                min="-180"
                max="180"
                value={rotation}
                onChange={(e) => setRotation(Number(e.target.value))}
                className="w-full"
              />
            </div>

            {/* Quick Presets */}
            <div>
              <label className="block text-sm font-normal text-white mb-2">Quick Angles</label>
              <div className="grid grid-cols-2 gap-1">
                {commonAngles.map((angle) => (
                  <button
                    key={angle.value}
                    onClick={() => setRotation(angle.value)}
                    className={`py-1 px-2 rounded text-xs font-normal transition ${
                      rotation === angle.value
                        ? 'bg-yellow-600 text-white'
                        : 'bg-slate-700 text-gray-300 hover:bg-slate-600'
                    }`}
                  >
                    {angle.label}
                  </button>
                ))}
              </div>
            </div>

            {/* Original Values */}
            {originalRotation !== undefined && (
              <div className="bg-slate-700 p-3 rounded text-xs space-y-1">
                <h3 className="font-normal text-white">Original AI Values</h3>
                <div className="text-gray-300 font-mono text-xs">
                  <div>Rotation: {originalRotation}°</div>
                  {originalCropBounds && (
                    <>
                      <div>Crop ({originalCropBounds.x}, {originalCropBounds.y})</div>
                      <div>Size {originalCropBounds.width}×{originalCropBounds.height}</div>
                    </>
                  )}
                  {imageProcessing?.confidence && (
                    <div>Confidence: {(imageProcessing.confidence * 100).toFixed(0)}%</div>
                  )}
                </div>
              </div>
            )}
          </div>

          {/* Right: Canvas + Log */}
          <div className="flex-1 flex flex-col gap-3 min-w-0 overflow-hidden">
            {/* Canvas - takes most space */}
            <div className="flex-1 flex flex-col bg-slate-800 p-3 rounded border border-slate-700 overflow-hidden">
              <h3 className="text-xs font-normal text-white mb-2">Preview (Green = Crop, Orange = Rotation)</h3>
              <div className="flex-1 flex items-center justify-center bg-black/70 rounded border border-slate-600 overflow-auto">
                <canvas
                  ref={canvasRef}
                  className="rounded"
                />
              </div>
            </div>

            {/* Log - single line */}
            <div className="bg-slate-800 p-2 rounded border border-slate-700 flex-shrink-0">
              <div className="bg-black text-green-400 p-2 rounded font-mono text-xs">
                {log}
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}
