import React, { useRef } from "react";
import {
  motion,
  useMotionValue,
  useSpring,
  useTransform,
  useScroll,
  useVelocity,
} from "framer-motion";
import { useNavigate } from "react-router-dom";

// images
import d1 from "../../../../src/assets/Images/d1.jpeg";
import d2 from "../../../../src/assets/Images/d2.jpeg";
import d3 from "../../../../src/assets/Images/d3.jpeg";
import d4 from "../../../../src/assets/Images/d4.jpeg";
import d5 from "../../../../src/assets/Images/d5.jpeg";
import d6 from "../../../../src/assets/Images/d6.jpeg";
import d7 from "../../../../src/assets/Images/d7.png";
import d8 from "../../../../src/assets/Images/d8.png";
import d9 from "../../../../src/assets/Images/d9.png";

// بيانات الأقسام
const departments = [
  { id: 1, title: "قسم إنشاء وصيانة المنشآت الصناعية وخطوط الإنتاج", image: d1 },
  { id: 2, title: "قسم تنفيذ المرافق السكنية والخدمية", image: d2 },
  { id: 3, title: "قسم اعادة تأهيل وصيانة المباني", image: d3 },
  { id: 4, title: "قسم محطات الوقود وصيانة المنشآت النفطية", image: d4 },
  { id: 5, title: "قسم التفتيش والفحص الفني والهندسي", image: d5 },
  { id: 6, title: "قسم المشاريع الاستراتيجية", image: d6 },
  { id: 7, title: "قسم الاعمال المعدنية والدعم الصناعي", image: d7 },
  { id: 8, title: "قسم الخدمات والدعم اللوجستي", image: d8 },
  { id: 9, title: "قسم الاتمتة والتحكم", image: d9 },
];

// بطاقة القسم
function DepartmentCard({ dept, offset }) {
  const navigate = useNavigate();
  const wrapperRef = useRef(null);

  // mouse tilt
  const rotateX = useMotionValue(0);
  const rotateY = useMotionValue(0);
  const scale = useMotionValue(1);

  const rx = useSpring(rotateX, { stiffness: 180, damping: 22 });
  const ry = useSpring(rotateY, { stiffness: 180, damping: 22 });
  const s = useSpring(scale, { stiffness: 180, damping: 24 });

  const titleZ = useTransform(s, [1, 1.05], [0, 36]);

  const onMove = (e) => {
    if (!wrapperRef.current) return;
    const rect = wrapperRef.current.getBoundingClientRect();
    const x = (e.clientX - rect.left - rect.width / 2) / rect.width;
    const y = (e.clientY - rect.top - rect.height / 2) / rect.height;

    rotateY.set(-x * 28);
    rotateX.set(y * 12);
    scale.set(1.05);
  };

  const onLeave = () => {
    rotateX.set(0);
    rotateY.set(0);
    scale.set(1);
  };

  // scroll parallax
  const { scrollY, scrollYProgress } = useScroll({ target: wrapperRef });
  const velocity = useVelocity(scrollY);
  const smoothVelocity = useSpring(velocity, {
    stiffness: 600,
    damping: 90,
  });

  const velocityParallax = useTransform(
    smoothVelocity,
    [-3000, 0, 3000],
    [-45, 0, 45]
  );

  const progressParallax = useTransform(
    scrollYProgress,
    [0, 1],
    [15, -15]
  );

  const y = useTransform(
    [velocityParallax, progressParallax],
    ([v, p]) => v + p
  );

  return (
    <div
      ref={wrapperRef}
      onMouseMove={onMove}
      onMouseLeave={onLeave}
      style={{ perspective: 1400 }}
      className={`relative w-full ${offset}`}
    >
      {/* العنوان */}
      <div className="absolute bottom-6 right-[-32px] z-40 pointer-events-none max-w-xs">
        <motion.span
          style={{ translateZ: titleZ }}
          className="block text-2xl md:text-3xl font-extrabold leading-snug
                     text-white drop-shadow-lg
                     bg-gradient-to-tr from-black/60 via-black/30 to-transparent
                     px-3 py-1 rounded-lg"
        >
          {dept.title}
        </motion.span>
      </div>

      {/* الصورة */}
      <motion.img
        src={dept.image}
        alt={dept.title}
        draggable={false}
        onClick={() => navigate(`/departments/${dept.id}`)}
        style={{
          rotateX: rx,
          rotateY: ry,
          scale: s,
          y,
          transformStyle: "preserve-3d",
          boxShadow:
            "0 18px 50px rgba(2,6,23,0.12), 0 6px 18px rgba(2,6,23,0.06)",
        }}
        className="cursor-pointer w-full h-96 object-cover rounded-2xl"
      />
    </div>
  );
}

export default function Departments() {
  return (
    <section className="min-h-screen bg-white text-black" dir="rtl">
      <header className="max-w-6xl mx-auto px-6 pt-12">
        <h1 className="text-4xl font-extrabold">أقسامنا</h1>
      </header>

      <main className="max-w-6xl mx-auto px-6 py-20">
        <div className="grid grid-cols-1 md:grid-cols-2 gap-x-16 gap-y-48">
          {departments.map((dept, index) => (
            <motion.div
              key={dept.id}
              initial={{ opacity: 0, y: 24 }}
              whileInView={{ opacity: 1, y: 0 }}
              viewport={{ once: false, amount: 0.25 }}
              transition={{
                duration: 0.7,
                ease: "easeOut",
                delay: index * 0.06,
              }}
            >
              <DepartmentCard
                dept={dept}
                offset={index % 2 === 0 ? "" : "md:translate-y-16"}
              />
            </motion.div>
          ))}
        </div>
      </main>
    </section>
  );
}