"use client";

import Headline from "@/components/ui/headline";
import { useSplitHeading } from "@/lib/useTextRevealHeading";
import Image from "next/image";
import { useRef, useEffect } from "react";
import { gsap } from "gsap";
import { ScrollTrigger } from "gsap/ScrollTrigger";

gsap.registerPlugin(ScrollTrigger);

const HowWork = () => {
  const headingRef = useRef<HTMLHeadingElement>(null);
  const paraRef = useRef<HTMLParagraphElement>(null);
  const containerRef = useRef<HTMLDivElement>(null);

  // Refs for animation targets
  const imageRef = useRef<HTMLImageElement>(null);
  const leftStepsRef = useRef<(HTMLDivElement | null)[]>([]);
  const rightStepsRef = useRef<(HTMLDivElement | null)[]>([]);

  useSplitHeading(headingRef, paraRef);

  const steps = [
    {
      id: "01",
      text: "Deploy Whispering Trees Pulse sensor directly onto your tree.",
      position: "left",
    },
    {
      id: "02",
      text: "Real-time data automatically streams to Whispering Trees Cloud.",
      position: "left",
    },
    {
      id: "03",
      text: "Dashboard displays tree health, history, and irrigation requirements.",
      position: "right",
    },
    {
      id: "04",
      text: "Export data or integrate seamlessly with city systems.",
      position: "right",
    },
  ];

  useEffect(() => {
    const ctx = gsap.context(() => {
      const tl = gsap.timeline({
        scrollTrigger: {
          trigger: imageRef.current,
          start: "top 70%",
          toggleActions: "play none none none",
        },
      });

      // 1. Image: clip-path from bottom → top
      if (imageRef.current) {
        gsap.set(imageRef.current, { clipPath: "inset(100% 0% 0% 0%)" });
        tl.to(imageRef.current, {
          clipPath: "inset(0% 0% 0% 0%)",
          duration: 1.2,
          ease: "power3.out",
        });
      }
      leftStepsRef.current.forEach((el, i) => {
        if (el) {
          gsap.set(el, { opacity: 0, x: -80 });
          tl.to(
            el,
            {
              opacity: 1,
              x: 0,
              duration: 0.8,
              ease: "power2.out",
            },
            i === 0 ? "-=0.8" : "-=0.6" // stagger
          );
        }
      });
      rightStepsRef.current.forEach((el, i) => {
        if (el) {
          gsap.set(el, { opacity: 0, x: 80 });
          tl.to(
            el,
            {
              opacity: 1,
              x: 0,
              duration: 0.8,
              ease: "power2.out",
            },
            i === 0 ? "-=0.8" : "-=0.6"
          );
        }
      });
    }, containerRef);

    return () => ctx.revert();
  }, []);

  return (
    <section
      ref={containerRef}
      id="how-it-works"
      className="tab:px-6 relative h-full w-full sm:px-2.5 lg:px-0"
    >
      <div className="mx-auto flex h-full w-full max-w-[1420px] flex-col items-center justify-start gap-12 py-8 sm:pt-8">
        {/* Heading */}
        <div className="tab:w-9/12 flex flex-col items-center justify-center gap-4 sm:w-full md:w-7/12">
          <Headline text="How It Works" />
          <h1
            ref={headingRef}
            className="font-switzer text-h-mobile-30 leading-h5 tab:text-h-2-60 tab:leading-h2 text-center font-semibold text-black"
          >
            The Whispering Trees{" "}
            <span className="font-playfair text-brand italic">Process.</span>
          </h1>
          <p
            ref={paraRef}
            className="font-mium-reg text-b-3-16 leading-b3 text-center tracking-[-0.8px] text-black"
          >
            Monitor tree health in real-time and optimize irrigation schedules
            with our intelligent sensor system, ensuring urban forests thrive
            while conserving water.
          </p>
        </div>

        {/* Steps + Image */}
        <div className="tab:flex-row tab:h-[500px] flex w-full items-center justify-between sm:flex-col">
          {/* Left Steps */}
          <div className="tab:w-4/12 flex h-full flex-col items-center justify-between sm:w-full">
            {steps
              .filter((s) => s.position === "left")
              .map((step, i) => (
                <div
                  key={step.id}
                  ref={(el) => {
                    leftStepsRef.current[i] = el;
                  }}
                  className="tab:h-[200px] tab:w-[350px] flex h-[180px] w-full flex-col items-center gap-4 sm:h-[180px]"
                >
                  <h2 className="font-switzer text-h-4-34 leading-h4 font-medium text-black">
                    {step.id}
                  </h2>
                  <p className="font-switzer text-b-1-20 leading-b1 text-center font-medium text-black">
                    {step.text}
                  </p>
                </div>
              ))}
          </div>

          {/* Center Image */}
          <div className="tab:mt-0 tab:mb-0 tab:w-4/12 h-full sm:-mt-14 sm:mb-14 sm:w-full">
            <Image
              ref={imageRef}
              alt="Product"
              width={600}
              height={600}
              src="/images/png/product.png"
              className="h-full w-full object-contain"
            />
          </div>

          {/* Right Steps */}
          <div className="tab:w-4/12 flex h-full flex-col items-center justify-between sm:w-full">
            {steps
              .filter((s) => s.position === "right")
              .map((step, i) => (
                <div
                  key={step.id}
                  ref={(el) => {
                    rightStepsRef.current[i] = el;
                  }}
                  className="tab:h-[200px] tab:w-[350px] flex h-[180px] w-full flex-col items-center gap-4 sm:h-[180px]"
                >
                  <h2 className="font-switzer text-h-4-34 leading-h4 font-medium text-black">
                    {step.id}
                  </h2>
                  <p className="font-switzer text-b-1-20 leading-b1 text-center font-medium text-black">
                    {step.text}
                  </p>
                </div>
              ))}
          </div>
        </div>
      </div>
    </section>
  );
};

export default HowWork;