import Link from "next/link";
import { FileText, MessageCircle, AlertCircle } from "lucide-react";
import Pagination from "@/components/Pagination";
import { IconComment, IconEye, IconHeart } from "@/components/Icons";
import type { UserProfile, UserCommentsResponse } from "@/lib/api";

/**
 * 用户主页内容区（纯服务端渲染）：
 * tab 与分页全部走 URL（?tab=comments&page=N），刷新/后退/分享链接均保持一致。
 */
export default function UserProfileContent({
  userId,
  profile,
  tab,
  commentData,
  commentError,
  page,
}: {
  userId: string;
  profile: UserProfile;
  tab: "posts" | "comments";
  commentData: UserCommentsResponse | null;
  commentError: boolean;
  page: number;
}) {
  const tabLink = (t: "posts" | "comments", label: string, count: number, icon: React.ReactNode) => {
    const active = tab === t;
    const href = t === "posts" ? `/u/${userId}` : `/u/${userId}?tab=comments`;
    return (
      <Link
        href={href}
        aria-current={active ? "page" : undefined}
        className={`inline-flex items-center justify-center gap-1.5 px-4 py-2 rounded-full text-sm font-semibold transition-all flex-1 sm:flex-none ${
          active ? "" : "hover:text-[var(--ink)]"
        }`}
        style={{
          background: active ? "var(--panel)" : "transparent",
          color: active ? "var(--accent)" : "var(--ink-3)",
          boxShadow: active ? "var(--shadow-sm)" : "none",
        }}
      >
        {icon}
        {label}
        <span
          className="text-[11px] font-bold px-1.5 py-px rounded-full tabular-nums"
          style={{
            background: active ? "var(--accent-soft)" : "var(--tint)",
            color: active ? "var(--accent)" : "var(--ink-3)",
          }}
        >
          {count}
        </span>
      </Link>
    );
  };

  return (
    <div>
      <div
        className="inline-flex w-full sm:w-auto items-center gap-1 mb-6 p-1 rounded-full"
        style={{ background: "var(--panel-2)" }}
      >
        {tabLink("posts", "发帖", profile.stats.post_count, <FileText size={15} />)}
        {tabLink("comments", "评论", profile.stats.comment_count, <MessageCircle size={15} />)}
      </div>

      {tab === "posts" ? (
        <div>
          {profile.posts.length > 0 ? (
            <div className="panel overflow-hidden p-0">
              {profile.posts.map((post, i) => (
                <Link
                  key={post.id}
                  href={`/post/${post.id}`}
                  className="group block px-4 sm:px-5 py-4 transition-colors hover:bg-[var(--panel-2)]"
                  style={{ borderTop: i === 0 ? "none" : "1px solid var(--line)" }}
                >
                  <div className="flex items-center gap-2 mb-2 flex-wrap">
                    <span className="j13-board-tag">{post.board.name}</span>
                    {post.pinned > 0 && <span className="badge-pin">置顶</span>}
                    {post.recommended && <span className="badge-rec">推荐</span>}
                  </div>
                  <h2
                    className="font-semibold mb-2 leading-snug transition-colors group-hover:text-[var(--accent)]"
                    style={{ color: "var(--ink)" }}
                  >
                    {post.title}
                  </h2>
                  <div className="flex items-center gap-4 meta text-[12px]">
                    <span className="tabular-nums">{new Date(post.created_at).toLocaleDateString("zh-CN")}</span>
                    <span className="inline-flex items-center gap-1">
                      <IconComment size={12} /> {post.comment_count}
                    </span>
                    <span className="inline-flex items-center gap-1">
                      <IconEye size={12} /> {post.view_count}
                    </span>
                    <span className="inline-flex items-center gap-1">
                      <IconHeart size={12} /> {post.like_count}
                    </span>
                  </div>
                </Link>
              ))}
            </div>
          ) : (
            <div className="panel text-center py-16 px-6">
              <FileText size={26} className="mx-auto mb-3" style={{ color: "var(--ink-3)" }} />
              <p className="text-sm font-semibold" style={{ color: "var(--ink-2)" }}>暂无发帖</p>
            </div>
          )}
          <Pagination
            total={profile.posts_total}
            page={page}
            size={20}
            basePath={`/u/${userId}`}
          />
        </div>
      ) : commentError ? (
        <div className="panel text-center py-16 px-6" role="alert">
          <AlertCircle size={26} className="mx-auto mb-3" style={{ color: "var(--danger)" }} />
          <p className="text-sm font-semibold" style={{ color: "var(--ink-2)" }}>评论加载失败</p>
          <p className="meta mt-1.5 mb-4">网络异常，请稍后重试</p>
          <Link href={`/u/${userId}?tab=comments`} className="btn btn-line btn-sm">重新加载</Link>
        </div>
      ) : commentData && commentData.comments.length > 0 ? (
        <div>
          <div className="panel overflow-hidden p-0">
            {commentData.comments.map((c, i) => (
              <Link
                key={c.id}
                href={`/post/${c.post_id}`}
                className="block px-4 sm:px-5 py-4 transition-colors hover:bg-[var(--panel-2)]"
                style={{ borderTop: i === 0 ? "none" : "1px solid var(--line)" }}
              >
                <div className="meta text-xs mb-2">
                  评论于《<span style={{ color: "var(--accent)" }}>{c.post_title}</span>》
                </div>
                <p
                  className="text-[15px] leading-relaxed line-clamp-2"
                  style={{ color: "var(--ink)" }}
                >
                  {c.content}
                </p>
                <div className="meta text-xs mt-2 tabular-nums">
                  {new Date(c.created_at).toLocaleString("zh-CN")}
                </div>
              </Link>
            ))}
          </div>
          <Pagination
            total={commentData.total}
            page={commentData.page}
            size={20}
            basePath={`/u/${userId}`}
            query={{ tab: "comments" }}
          />
        </div>
      ) : (
        <div className="panel text-center py-16 px-6">
          <MessageCircle size={26} className="mx-auto mb-3" style={{ color: "var(--ink-3)" }} />
          <p className="text-sm font-semibold" style={{ color: "var(--ink-2)" }}>暂无评论</p>
        </div>
      )}
    </div>
  );
}