import { useState, useEffect } from "react";
import { Card, CardContent, CardDescription, CardFooter, CardHeader, CardTitle } from "@/components/ui/card"
import { Tag } from "primereact/tag";
import ZapDisplay from "@/components/zaps/ZapDisplay";
import { nip19 } from "nostr-tools";
import Image from "next/image"
import { useZapsSubscription } from "@/hooks/nostrQueries/zaps/useZapsSubscription";
import { getTotalFromZaps } from "@/utils/lightning";
import { useImageProxy } from "@/hooks/useImageProxy";
import { useRouter } from "next/router";
import { formatTimestampToHowLongAgo } from "@/utils/time";
import { ProgressSpinner } from "primereact/progressspinner";
import GenericButton from "@/components/buttons/GenericButton";
import { defaultRelayUrls } from "@/context/NDKContext";

export function CourseTemplate({ course }) {
  const { zaps, zapsLoading, zapsError } = useZapsSubscription({ event: course });
  const [zapAmount, setZapAmount] = useState(0);
  const [lessonCount, setLessonCount] = useState(0);
  const [nAddress, setNAddress] = useState(null);
  const router = useRouter();
  const { returnImageProxy } = useImageProxy();

  useEffect(() => {
    if (zaps.length > 0) {
      const total = getTotalFromZaps(zaps, course);
      setZapAmount(total);
    }
  }, [zaps, course]);

  useEffect(() => {
    if (course && course?.tags) {
      const lessons = course.tags.filter(tag => tag[0] === "a");
      setLessonCount(lessons.length);
    }
  }, [course]);

  useEffect(() => {
    if (course && course?.id) {
      const nAddress = nip19.naddrEncode({
        pubkey: course.pubkey,
        kind: course.kind,
        identifier: course.id,
        relayUrls: defaultRelayUrls
      });
      setNAddress(nAddress);
    }
  }, [course]);

  if (!nAddress) return <div className='w-full h-full flex items-center justify-center'><ProgressSpinner /></div>

  if (zapsError) return <div>Error: {zapsError}</div>;

  return (
    <Card className="overflow-hidden group hover:shadow-xl transition-all duration-300 bg-gray-800 m-2 border-none">
      <div className="relative h-48 sm:h-64">
        <Image
          src={returnImageProxy(course.image)}
          alt="Course background"
          quality={100}
          layout="fill"
          className={`${router.pathname === "/content" ? "w-full h-full object-cover" : "w-full h-full object-cover transition-transform duration-300 group-hover:scale-105"}`}
        />
        <div className="absolute inset-0 bg-gradient-to-br from-primary/80 to-primary-foreground/50" />
        <div className="absolute top-4 right-4 flex items-center gap-1 bg-black/50 text-white px-2 py-1 rounded-full z-10">
          <ZapDisplay zapAmount={zapAmount} event={course} zapsLoading={zapsLoading && zapAmount === 0} />
        </div>
        <CardHeader className="absolute bottom-[-8px] left-0 right-0 text-white bg-gray-800/70 w-fit rounded-lg rounded-bl-none rounded-tl-none rounded-br-none p-4 max-w-[70%] max-h-[60%]">
          <div className="flex items-center justify-center gap-4">
            <i className="pi pi-book text-2xl text-[#f8f8ff]"></i>
            <div>
              <CardTitle className="text-2xl sm:text-3xl mb-2">{course.name || course.title}</CardTitle>
            </div>
          </div>
        </CardHeader>
      </div>
      <CardContent className="pt-6 pb-2 w-full flex flex-row justify-between items-center">
        <div className="flex flex-wrap gap-2">
          {course && course.topics && course.topics.map((topic, index) => (
            <Tag key={index} className="px-3 py-1 text-sm text-[#f8f8ff]">
              {topic}
            </Tag>
          ))}
        </div>
        <p className="font-bold text-gray-300 min-w-[12%]">{lessonCount} lessons</p>
      </CardContent>
      <CardDescription className="p-6 py-2 text-base text-neutral-50/90 dark:text-neutral-900/90 overflow-hidden min-h-[4em] flex items-center"
        style={{
          overflow: "hidden",
          display: "-webkit-box",
          WebkitBoxOrient: "vertical",
          WebkitLineClamp: "2"
        }}>
        {course.description || course.summary && (
          <>
            {course.description && (
              <div>
                {course.description.split('\n').map((line, index) => (
                  <p key={index}>{line}</p>
                ))}
              </div>
            )}
            {course.summary && (
              <div>
                {course.summary.split('\n').map((line, index) => (
                  <p key={index}>{line}</p>
                ))}
              </div>
            )}
          </>
        )}
      </CardDescription>
      <CardFooter className="flex flex-col sm:flex-row items-start sm:items-center justify-between gap-4 border-t border-gray-700 pt-4">
        <p className="text-sm text-gray-300">{course?.published_at && course.published_at !== "" ? (
          formatTimestampToHowLongAgo(course.published_at)
        ) : (
          formatTimestampToHowLongAgo(course.created_at)
        )}</p>
        <GenericButton onClick={() => router.push(`/course/${nAddress}`)} size="small" label="Start Learning" icon="pi pi-chevron-right" iconPos="right" outlined className="items-center py-2" />
      </CardFooter>
    </Card>
  )
}