"use client";

import { useState } from "react";
import Image from "next/image";
import Link from "next/link";
import { RefreshCw, Coffee } from "lucide-react";
import SessionCoverImage from "./SessionCoverImage";
import AddressLink from "./AddressLink";
import { ACTIVITY_TYPES, SESSION_TAGS, MOCK_JOINERS_SESSION1, MOCK_JOINERS_SESSION2 } from "@/config/home.config";
import { mergeJoiners, getUniqueDbCount } from "@/app/lib/joiners";
import { useXhClickOpener } from "@/app/hooks/useXhClickOpener";

interface JoinStats {
  count: number;
  joiners: { nickname: string; avatar?: string; xiaohongshu_url?: string }[];
}

function getMockForSession(sessionId: string) {
  return sessionId === "session-1" ? MOCK_JOINERS_SESSION1 : MOCK_JOINERS_SESSION2;
}

function AvatarItem({ joiner }: { joiner: { name?: string; nickname?: string; avatar?: string; xiaohongshu_url?: string } }) {
  const [imgError, setImgError] = useState(false);
  const nickname = ("name" in joiner ? joiner.name : joiner.nickname) ?? "";
  const avatar = joiner.avatar;
  const xhUrl = joiner.xiaohongshu_url;
  const showAvatar = avatar && avatar.length > 0 && !imgError;
  const handleClick = useXhClickOpener(xhUrl);

  return (
    <span
      className="relative w-7 h-7 rounded-full overflow-hidden border-2 border-white dark:border-stone-900 ring-1 ring-stone-200/50 dark:ring-stone-700/50 shrink-0 inline-block cursor-default"
      {...(xhUrl && { "data-xiaohongshu-url": xhUrl })}
      onClick={handleClick}
    >
      {showAvatar ? (
        <Image src={avatar} alt="" fill sizes="28px" className="object-cover" unoptimized onError={() => setImgError(true)} />
      ) : (
        <span className="flex items-center justify-center w-full h-full text-xs font-medium bg-amber-100 dark:bg-amber-900/30 text-amber-700 dark:text-amber-300">
          {nickname.slice(0, 1) || "?"}
        </span>
      )}
    </span>
  );
}

type SessionTag = keyof typeof SESSION_TAGS;

interface SessionItem {
  id: string;
  type: "skill-exchange" | "side-hustle" | "loft" | "light-chat";
  title: string;
  date: string;
  time: string;
  place: string;
  city: string;
  coverImage?: string;
  tags?: readonly SessionTag[];
}

export default function SessionCard({
  session,
  index,
  stats,
}: {
  session: SessionItem;
  index: number;
  stats: JoinStats | null;
}) {

  return (
    <div className="group flex flex-col sm:flex-row gap-3 sm:gap-4 p-4 sm:p-5 rounded-xl sm:rounded-2xl bg-white dark:bg-stone-900/80 border border-stone-200/80 dark:border-stone-700/80 hover:border-amber-200 dark:hover:border-amber-900/50 hover:shadow-lg hover:shadow-amber-900/5 transition-all duration-200 ease-out">
      <div className="relative w-full sm:w-36 md:w-40 sm:min-w-[144px] md:min-w-[160px] shrink-0 aspect-[16/10] rounded-lg sm:rounded-xl overflow-hidden bg-stone-100 dark:bg-stone-800">
        {session.coverImage ? (
          <SessionCoverImage
            src={session.coverImage}
            alt={session.title}
            type={session.type}
            fill
            sizes="(max-width: 640px) 100vw, (max-width: 768px) 144px, 160px"
            className="object-cover"
          />
        ) : (
          <div className="absolute inset-0 flex items-center justify-center text-amber-500/70 dark:text-amber-400/50">
            {session.type === "skill-exchange" ? <RefreshCw className="size-8" aria-hidden /> : <Coffee className="size-8" aria-hidden />}
          </div>
        )}
      </div>
      <div className="min-w-0 flex-1">
        <div className="flex flex-wrap gap-1 mb-1.5 min-h-[1.5rem]">
          {session.tags?.map((tag) => (
            <span
              key={tag}
              className="inline-block text-[9px] sm:text-[10px] font-medium text-amber-600 dark:text-amber-400/90 bg-amber-50 dark:bg-amber-900/20 px-1.5 py-0.5 rounded"
            >
              {SESSION_TAGS[tag]}
            </span>
          ))}
          {!session.tags?.includes("light-topic") && (
            <span className="inline-block text-[9px] sm:text-[10px] font-medium px-1.5 py-0.5 rounded opacity-0" aria-hidden>
              {SESSION_TAGS["light-topic"]}
            </span>
          )}
          {index === 0 ? (
            <span className="inline-block text-[9px] sm:text-[10px] font-medium text-amber-600 dark:text-amber-400 bg-amber-50 dark:bg-amber-900/20 px-1.5 py-0.5 rounded">
              主推
            </span>
          ) : (
            <span className="inline-block text-[9px] sm:text-[10px] font-medium px-1.5 py-0.5 rounded opacity-0" aria-hidden>
              主推
            </span>
          )}
        </div>
        <span className="text-[10px] sm:text-xs text-amber-600 dark:text-amber-400/90">
          {ACTIVITY_TYPES[session.type]} · {session.city}
        </span>
        <h3 className="font-semibold text-stone-800 dark:text-stone-100 text-sm sm:text-base group-hover:text-amber-700 dark:group-hover:text-amber-400 mt-0.5">
          {session.title}
        </h3>
        <p className="text-xs sm:text-sm text-stone-500 dark:text-stone-400 mt-0.5">
          {session.date} {session.time}
        </p>
        <p className="text-xs sm:text-sm text-stone-500 dark:text-stone-400 mt-0.5">
          <AddressLink place={session.place} city={session.city} />
        </p>
        <Link
          href={`/join?session=${encodeURIComponent(session.id)}`}
          className="inline-flex items-center gap-1 mt-2 sm:mt-3 text-amber-600 dark:text-amber-400 text-xs sm:text-sm font-medium hover:text-amber-700 dark:hover:text-amber-300 transition-colors"
        >
          报名这场 →
        </Link>
        <div className="mt-3 flex items-center gap-2 min-w-0 overflow-hidden">
          <div className="flex -space-x-2 shrink-0">
            {mergeJoiners(getMockForSession(session.id), stats?.joiners).map((j, i) => (
              <AvatarItem key={`${i}-${(j.nickname || j.name) || i}`} joiner={j} />
            ))}
          </div>
          <span className="text-xs text-stone-500 dark:text-stone-400">
            {3 + getUniqueDbCount(stats?.joiners)} 人已报名
          </span>
        </div>
      </div>
    </div>
  );
}