src/components/lessons/Chapter2Slides.jsx

import React from 'react';
import { motion } from 'framer-motion';
import { Activity, Dumbbell, Gamepad2, Stethoscope, Play, CheckCircle2 } from 'lucide-react';
import ClickReveal from './ClickReveal';
import KeyTermBadge from './KeyTermBadge';
import { PoseSkeletonDemo } from './AnimatedDiagram';

export const chapter2Slides = [
  // Slide 1: What is Pose Estimation?
  {
    content: (
      <div className="space-y-8">
        <motion.div
          initial={{ scale: 0 }}
          animate={{ scale: 1 }}
          transition={{ type: "spring", delay: 0.2 }}
          className="w-24 h-24 mx-auto rounded-3xl bg-gradient-to-br from-purple-500 to-pink-500 flex items-center justify-center shadow-2xl shadow-purple-500/30"
        >
          <Activity className="w-12 h-12 text-white" />
        </motion.div>

        <div className="text-center">
          <h1 className="text-4xl md:text-5xl font-black text-white mb-4">
            What is Pose Estimation?
          </h1>
          <p className="text-xl text-white/70">Chapter 2 • Slide 1 of 5</p>
        </div>

        <motion.div
          initial={{ opacity: 0, y: 20 }}
          animate={{ opacity: 1, y: 0 }}
          transition={{ delay: 0.4 }}
          className="bg-white/5 backdrop-blur-xl rounded-3xl p-8 border border-white/10"
        >
          <p className="text-xl text-white/90 leading-relaxed mb-6">
            <KeyTermBadge term="Pose Estimation" definition="Technology that detects human body positions by identifying key body points" color="purple" /> is like teaching a computer to understand <span className="text-purple-400 font-semibold">body language</span>!
          </p>
          
          <p className="text-lg text-white/70 leading-relaxed">
            It finds important points on your body — like your nose, shoulders, elbows, and knees — and connects them to create a "skeleton" that shows how you're moving.
          </p>
        </motion.div>

        <ClickReveal title="🎮 Cool Connection!" color="purple">
          <p>Video games like Just Dance use pose estimation to track your dance moves in real-time!</p>
        </ClickReveal>
      </div>
    )
  },

  // Slide 2: Keypoints and Skeleton Lines
  {
    content: (
      <div className="space-y-8">
        <div className="text-center">
          <h1 className="text-4xl md:text-5xl font-black text-white mb-4">
            Keypoints & Skeleton
          </h1>
          <p className="text-xl text-white/70">Building a digital body map</p>
        </div>

        <div className="grid md:grid-cols-2 gap-6">
          <motion.div
            initial={{ opacity: 0, y: 20 }}
            animate={{ opacity: 1, y: 0 }}
            transition={{ delay: 0.3 }}
          >
            <PoseSkeletonDemo />
          </motion.div>

          <div className="space-y-4">
            <motion.div
              initial={{ opacity: 0, x: 20 }}
              animate={{ opacity: 1, x: 0 }}
              transition={{ delay: 0.4 }}
              className="bg-white/5 backdrop-blur-xl rounded-2xl p-5 border border-white/10"
            >
              <h3 className="text-xl font-bold text-white mb-3 flex items-center gap-2">
                <span className="w-3 h-3 rounded-full bg-pink-500" />
                Keypoints
              </h3>
              <p className="text-white/80">
                <KeyTermBadge term="Keypoints" definition="Specific body locations like joints that the AI tracks" color="pink" /> are the important spots on your body that the AI tracks — typically 17 points including your nose, eyes, shoulders, elbows, wrists, hips, knees, and ankles.
              </p>
            </motion.div>

            <motion.div
              initial={{ opacity: 0, x: 20 }}
              animate={{ opacity: 1, x: 0 }}
              transition={{ delay: 0.5 }}
              className="bg-white/5 backdrop-blur-xl rounded-2xl p-5 border border-white/10"
            >
              <h3 className="text-xl font-bold text-white mb-3 flex items-center gap-2">
                <div className="w-8 h-0.5 bg-gradient-to-r from-purple-500 to-pink-500" />
                Skeleton Lines
              </h3>
              <p className="text-white/80">
                Lines connect the keypoints to show your body structure — like a stick figure that moves exactly like you!
              </p>
            </motion.div>

            <motion.div
              initial={{ opacity: 0, x: 20 }}
              animate={{ opacity: 1, x: 0 }}
              transition={{ delay: 0.6 }}
              className="bg-gradient-to-br from-purple-500/20 to-pink-500/20 rounded-2xl p-5 border border-purple-500/30"
            >
              <p className="text-white/90 font-medium">
                💡 Each keypoint has X, Y coordinates (position) and sometimes a confidence score!
              </p>
            </motion.div>
          </div>
        </div>
      </div>
    )
  },

  // Slide 3: Real-World Uses
  {
    content: (
      <div className="space-y-8">
        <div className="text-center">
          <h1 className="text-4xl md:text-5xl font-black text-white mb-4">
            Real-World Uses
          </h1>
          <p className="text-xl text-white/70">Pose estimation helps everywhere!</p>
        </div>

        <div className="grid gap-6">
          {[
            {
              icon: Dumbbell,
              title: "Sports & Fitness",
              description: "Coaches analyze athlete movements to improve technique. Fitness apps check if you're doing exercises correctly!",
              color: "from-purple-500 to-pink-500"
            },
            {
              icon: Gamepad2,
              title: "Gaming & VR",
              description: "Motion-controlled games track your body to make you the controller. Dance games know exactly how you move!",
              color: "from-blue-500 to-purple-500"
            },
            {
              icon: Stethoscope,
              title: "Healthcare",
              description: "Physical therapists use it to track patient recovery. It can even help detect early signs of movement disorders.",
              color: "from-emerald-500 to-teal-500"
            }
          ].map((item, i) => (
            <motion.div
              key={i}
              initial={{ opacity: 0, x: -30 }}
              animate={{ opacity: 1, x: 0 }}
              transition={{ delay: 0.3 + i * 0.15 }}
              className="bg-white/5 backdrop-blur-xl rounded-2xl p-6 border border-white/10 flex items-start gap-4"
            >
              <div className={`w-14 h-14 rounded-xl bg-gradient-to-br ${item.color} flex items-center justify-center flex-shrink-0`}>
                <item.icon className="w-7 h-7 text-white" />
              </div>
              <div>
                <h3 className="text-xl font-bold text-white mb-2">{item.title}</h3>
                <p className="text-white/70">{item.description}</p>
              </div>
            </motion.div>
          ))}
        </div>

        <ClickReveal title="🏃 Amazing Fact!" color="purple">
          <p>Olympic coaches use pose estimation to analyze athletes frame-by-frame, finding improvements invisible to the human eye!</p>
        </ClickReveal>
      </div>
    )
  },

  // Slide 4: Animated Stick Figure
  {
    content: (
      <div className="space-y-8">
        <div className="text-center">
          <h1 className="text-4xl md:text-5xl font-black text-white mb-4">
            See It Move!
          </h1>
          <p className="text-xl text-white/70">Watch pose estimation in action</p>
        </div>

        <AnimatedStickFigure />

        <div className="grid md:grid-cols-3 gap-4">
          {[
            { label: "Real-time Tracking", icon: "⚡" },
            { label: "17 Keypoints", icon: "📍" },
            { label: "Smooth Motion", icon: "🌊" }
          ].map((item, i) => (
            <motion.div
              key={i}
              initial={{ opacity: 0, y: 20 }}
              animate={{ opacity: 1, y: 0 }}
              transition={{ delay: 0.5 + i * 0.1 }}
              className="bg-white/5 rounded-xl p-4 border border-white/10 text-center"
            >
              <span className="text-2xl">{item.icon}</span>
              <p className="text-white/80 mt-2 font-medium">{item.label}</p>
            </motion.div>
          ))}
        </div>
      </div>
    )
  },

  // Slide 5: Chapter Summary
  {
    content: (
      <div className="space-y-10">
        <div className="text-center mb-8">
          <div className="text-7xl mb-6">🎊</div>
          <h1 className="text-5xl md:text-6xl font-black text-white mb-6">
            Chapter Complete!
          </h1>
          <p className="text-2xl text-white/70">You've mastered Pose Estimation</p>
        </div>

        <div className="bg-gradient-to-br from-purple-500/20 to-pink-500/20 rounded-3xl p-10 border border-purple-500/30">
          <h3 className="text-2xl font-bold text-white mb-6 flex items-center gap-3">
            <CheckCircle2 className="w-8 h-8 text-purple-400" />
            Key Takeaways
          </h3>
          <div className="grid gap-4">
            {[
              { icon: "🎯", text: "Pose estimation tracks body movements using keypoints" },
              { icon: "🦴", text: "17 keypoints create a full body skeleton" },
              { icon: "⚽", text: "Used in sports, gaming, healthcare, and more" },
              { icon: "⚡", text: "Works in real-time for interactive applications" }
            ].map((item, i) => (
              <motion.div
                key={i}
                initial={{ opacity: 0, x: -20 }}
                animate={{ opacity: 1, x: 0 }}
                transition={{ delay: 0.3 + i * 0.1 }}
                className="flex items-center gap-4 bg-white/5 rounded-2xl p-5"
              >
                <div className="text-4xl">{item.icon}</div>
                <p className="text-white/90 text-lg flex-1">{item.text}</p>
              </motion.div>
            ))}
          </div>
        </div>

        <div className="grid md:grid-cols-3 gap-6">
          <div className="bg-white/5 rounded-2xl p-6 text-center border border-white/10">
            <div className="text-4xl mb-3">🎯</div>
            <div className="text-3xl font-bold text-purple-400">5</div>
            <div className="text-white/60">Slides Completed</div>
          </div>
          <div className="bg-white/5 rounded-2xl p-6 text-center border border-white/10">
            <div className="text-4xl mb-3">📍</div>
            <div className="text-3xl font-bold text-pink-400">17</div>
            <div className="text-white/60">Body Keypoints</div>
          </div>
          <div className="bg-white/5 rounded-2xl p-6 text-center border border-white/10">
            <div className="text-4xl mb-3">👥</div>
            <div className="text-3xl font-bold text-violet-400">Multi</div>
            <div className="text-white/60">Person Tracking</div>
          </div>
        </div>
      </div>
    )
  }
];

function AnimatedStickFigure() {
  const [pose, setPose] = React.useState(0);
  const poses = ['standing', 'waving'];

  React.useEffect(() => {
    const interval = setInterval(() => {
      setPose(p => (p + 1) % poses.length);
    }, 2000);
    return () => clearInterval(interval);
  }, []);

  const poseConfigs = {
    standing: {
      head: { x: 50, y: 15 },
      neck: { x: 50, y: 22 },
      lshoulder: { x: 38, y: 25 },
      rshoulder: { x: 62, y: 25 },
      lelbow: { x: 32, y: 38 },
      relbow: { x: 68, y: 38 },
      lwrist: { x: 30, y: 50 },
      rwrist: { x: 70, y: 50 },
      hip: { x: 50, y: 50 },
      lhip: { x: 42, y: 52 },
      rhip: { x: 58, y: 52 },
      lknee: { x: 42, y: 70 },
      rknee: { x: 58, y: 70 },
      lankle: { x: 42, y: 88 },
      rankle: { x: 58, y: 88 }
    },
    waving: {
      head: { x: 50, y: 15 },
      neck: { x: 50, y: 22 },
      lshoulder: { x: 38, y: 25 },
      rshoulder: { x: 62, y: 25 },
      lelbow: { x: 32, y: 38 },
      relbow: { x: 75, y: 15 },
      lwrist: { x: 30, y: 50 },
      rwrist: { x: 85, y: 8 },
      hip: { x: 50, y: 50 },
      lhip: { x: 42, y: 52 },
      rhip: { x: 58, y: 52 },
      lknee: { x: 42, y: 70 },
      rknee: { x: 58, y: 70 },
      lankle: { x: 42, y: 88 },
      rankle: { x: 58, y: 88 }
    }
  };

  const currentPose = poseConfigs[poses[pose]];
  const bones = [
    ['head', 'neck'],
    ['neck', 'lshoulder'],
    ['neck', 'rshoulder'],
    ['lshoulder', 'lelbow'],
    ['rshoulder', 'relbow'],
    ['lelbow', 'lwrist'],
    ['relbow', 'rwrist'],
    ['neck', 'hip'],
    ['hip', 'lhip'],
    ['hip', 'rhip'],
    ['lhip', 'lknee'],
    ['rhip', 'rknee'],
    ['lknee', 'lankle'],
    ['rknee', 'rankle'],
  ];

  return (
    <div className="relative max-w-md mx-auto">
      <div className="aspect-[3/4] bg-gradient-to-br from-purple-900/50 to-pink-900/50 rounded-3xl overflow-hidden border border-white/10">
        <svg className="w-full h-full" viewBox="0 0 100 100">
          {/* Bones */}
          {bones.map(([from, to], i) => (
            <motion.line
              key={i}
              x1={currentPose[from].x}
              y1={currentPose[from].y}
              x2={currentPose[to].x}
              y2={currentPose[to].y}
              stroke="url(#poseGradient)"
              strokeWidth="3"
              strokeLinecap="round"
              initial={false}
              animate={{
                x1: currentPose[from].x,
                y1: currentPose[from].y,
                x2: currentPose[to].x,
                y2: currentPose[to].y
              }}
              transition={{ type: "spring", stiffness: 100, damping: 15 }}
            />
          ))}

          {/* Keypoints */}
          {Object.entries(currentPose).map(([key, pos], i) => (
            <motion.circle
              key={key}
              r="4"
              fill="#EC4899"
              initial={false}
              animate={{ cx: pos.x, cy: pos.y }}
              transition={{ type: "spring", stiffness: 100, damping: 15 }}
            />
          ))}

          <defs>
            <linearGradient id="poseGradient" x1="0%" y1="0%" x2="100%" y2="100%">
              <stop offset="0%" stopColor="#8B5CF6" />
              <stop offset="100%" stopColor="#EC4899" />
            </linearGradient>
          </defs>
        </svg>
      </div>

      {/* Pose Label */}
      <motion.div
        key={pose}
        initial={{ opacity: 0, y: 10 }}
        animate={{ opacity: 1, y: 0 }}
        className="mt-4 text-center"
      >
        <span className="px-6 py-2 rounded-full bg-gradient-to-r from-purple-500 to-pink-500 text-white font-bold text-lg">
          {poses[pose].charAt(0).toUpperCase() + poses[pose].slice(1)}
        </span>
      </motion.div>
    </div>
  );
}