import { useEffect, useMemo, useReducer, useState } from 'react';
import { MiniTitle } from '../../ui/MiniTitle';
import { useWindowWidth } from '../../hooks/useWindowWidth';
import { Title } from '../../ui/Title';
import { useSwipeable } from 'react-swipeable';

export function Projects() {
  return (
    <div
      id="projects"
      className="lg:py-[70px] lg:px-10 mobile:py-14 sm:px-6 mobile:px-5 overflow-hidden select-none"
    >
      <Title className="desktop-figma:mb-[77px] lg:mb-14 mobile:mb-6">
        <span className="text-gradient">Большой опыт в работе</span> с
        промышленными предприятиями и учебными заведениями
      </Title>
      <MiniTitle text="реализованные проекты" />
      <Slider
        projects={[
          {
            src: 'src/assets/tank.png',
            tags: ['Симулятор', 'VR-приложение'],
            title: 'Ремонт и обслуживание двигателей спецтехники',
          },
          {
            src: 'src/assets/helicopter.jpg',
            tags: ['Симулятор'],
            title: 'Сборка-разборка вертолётного двигателя',
          },
          {
            src: 'src/assets/train.png',
            tags: ['Симулятор'],
            title: 'Симулятор машиниста',
          },
        ]}
      />
    </div>
  );
}

function Project({
  src,
  title,
  tags,
}: {
  src: string;
  title: string;
  tags: string[];
}) {
  return (
    <div className="bg-[#3D425C] bg-opacity-50 rounded-2xl box-border lg:min-w-[624px] sm:min-w-[520px] mobile:min-w-[328px] duration-1000 lg:translate-x-[264px] pointer-events-none">
      <div
        className="bg-cover bg-center bg-no-repeat h-[340px] rounded-2xl"
        style={{ backgroundImage: `url(${src})` }}
      />
      <div className="p-5">
        <h4 className="text-[#ffffff] font-medium h4">{title}</h4>
        <div className="flex gap-2 mt-4">
          {tags.map(tag => (
            <p
              key={tag}
              className="text-[#ffffff] opacity-80 font-medium rounded-3xl py-3 px-4 border border-[#798FFF] m-text"
            >
              {tag}
            </p>
          ))}
        </div>
      </div>
    </div>
  );
}

function Slider({
  projects,
}: {
  projects: { src: string; title: string; tags: string[] }[];
}) {
  const width = useWindowWidth();
  const baseOffset = useMemo(
    () => (width >= 1024 ? 640 : width >= 640 ? 536 : 336),
    [width],
  );
  const [sliderOffset, setSliderOffset] = useState(-baseOffset);
  const [slide, setSlide] = useState(0);

  const [order, dispatch] = useReducer(
    (state: typeof projects, action: string) => {
      if (action === 'next') {
        setSliderOffset(prev => prev + baseOffset);
        return [...state.slice(1), state[2]];
      }
      if (action === 'prev') {
        setSliderOffset(-baseOffset * 2);
        return [state[state.length - 3], ...state.slice(0, -1)];
      }
      return state;
    },
    [projects[projects.length - 1], ...projects, projects[0]],
  );

  const handlers = useSwipeable({
    onSwipedLeft: () => {
      setSlide(prev => (prev === order.length - 3 ? 0 : prev + 1));
      dispatch('next');
    },
    onSwipedRight: () => {
      setSlide(prev => (prev === 0 ? order.length - 3 : prev - 1));
      dispatch('prev');
    },
    trackMouse: true,
    preventScrollOnSwipe: true,
    touchEventOptions: { passive: false },
  });

  useEffect(() => {
    setSliderOffset(-baseOffset);
  }, [order, baseOffset, slide]);

  return (
    <div className="flex flex-col lg:mt-4 sm:mt-3 mobile:mt-2">
      <div {...handlers}>
        <div
          className="flex gap-2 overflow-visible relative mb-[18px] -mr-10 select-none"
          style={{
            transition: `${sliderOffset === 0 || sliderOffset === -baseOffset * 2 ? 0 : 0.5}s`,
            transform: `translateX(${sliderOffset}px)`,
          }}
        >
          {order.map((project, index) => (
            <Project key={index} {...project} />
          ))}
        </div>
      </div>
      <div className="flex items-center gap-4 lg:max-desktop-figma:w-[clamp(720px,100vw-465px,1135px)] desktop-figma:w-[70.9vw] mobile:w-full self-start lg:ml-64">
        <button
          onClick={() => {
            setSlide(prev => (prev === 0 ? order.length - 3 : prev - 1));
            dispatch('prev');
          }}
          className="mobile:max-sm:hidden"
        >
          <img src="src/assets/left_slide.svg" alt="" />
        </button>
        <div className="h-1 bg-[#3D425C] w-full">
          <div
            className="bg-[#ffffff] h-1 duration-500"
            style={{ width: `${((slide + 1) / 3) * 100}%` }}
          />
        </div>
        <button
          onClick={() => {
            setSlide(prev => (prev === order.length - 3 ? 0 : prev + 1));
            dispatch('next');
          }}
          className="mobile:max-sm:hidden"
        >
          <img src="src/assets/right_slide.svg" alt="" />
        </button>
      </div>
    </div>
  );
}