"use client";

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

interface UserProfileClientProps {
  userId: string;
  initialPosts: UserProfile;
  initialPage: number;
}

type Tab = "posts" | "comments";

export default function UserProfileClient({ userId, initialPosts, initialPage }: UserProfileClientProps) {
  const [tab, setTab] = useState<Tab>("posts");
  const [commentData, setCommentData] = useState<UserCommentsResponse | null>(null);
  const [commentLoading, setCommentLoading] = useState(false);
  const [commentPage, setCommentPage] = useState(1);

  const loadComments = async (page: number) => {
    setCommentLoading(true);
    try {
      const data = await fetchUserComments(userId, page);
      setCommentData({ ...data, comments: data.comments || [] });
      setCommentPage(page);
    } catch {
      setCommentData({ comments: [], total: 0, page, size: 20 });
    }
    setCommentLoading(false);
  };

  const handleTabChange = (t: Tab) => {
    setTab(t);
    if (t === "comments" && commentData === null) {
      loadComments(1);
    }
  };

  const tabBtn = (t: Tab, label: string, count: number, icon: React.ReactNode) => {
    const active = tab === t;
    return (
      <button
        onClick={() => handleTabChange(t)}
        className="flex-1 sm:flex-none inline-flex items-center justify-center gap-1.5 px-4 py-2 rounded-full text-sm font-semibold transition-all"
        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"
          style={{
            background: active ? "var(--accent-soft)" : "var(--tint)",
            color: active ? "var(--accent)" : "var(--ink-3)",
          }}
        >
          {count}
        </span>
      </button>
    );
  };

  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)" }}
      >
        {tabBtn("posts", "发帖", initialPosts.stats.post_count, <FileText size={15} />)}
        {tabBtn("comments", "评论", initialPosts.stats.comment_count, <MessageCircle size={15} />)}
      </div>

      {tab === "posts" ? (
        <div>
          {initialPosts.posts.length > 0 ? (
            <div className="panel overflow-hidden p-0">
              {initialPosts.posts.map((post, i) => (
                <Link
                  key={post.id}
                  href={`/post/${post.id}`}
                  className="block px-4 sm:px-5 py-4 transition-colors hover:bg-[var(--panel-2)]"
                  style={{ borderTop: i === 0 ? "none" : "1px solid var(--line)" }}
                >
                  <div className="flex items-center gap-2 mb-2 flex-wrap">
                    <span className="chip">{post.board.name}</span>
                    {post.pinned > 0 && <span className="badge-pin">置顶</span>}
                    {post.recommended && <span className="badge-rec">推荐</span>}
                  </div>
                  <h2
                    className="font-semibold mb-2 leading-snug group-hover:text-[var(--accent)]"
                    style={{ color: "var(--ink)" }}
                  >
                    {post.title}
                  </h2>
                  <div className="flex items-center gap-4 meta text-[12px]">
                    <span>{new Date(post.created_at).toLocaleDateString("zh-CN")}</span>
                    <span className="inline-flex items-center gap-1">
                      <IconComment size={12} /> {post.comment_count}
                    </span>
                    <span className="inline-flex items-center gap-1">
                      <IconEye size={12} /> {post.view_count}
                    </span>
                    <span className="inline-flex items-center gap-1">
                      <IconHeart size={12} /> {post.like_count}
                    </span>
                  </div>
                </Link>
              ))}
            </div>
          ) : (
            <div className="panel text-center py-16 px-6">
              <FileText size={26} className="mx-auto mb-3" style={{ color: "var(--ink-3)" }} />
              <p className="text-sm font-semibold" style={{ color: "var(--ink-2)" }}>暂无发帖</p>
            </div>
          )}
          <Pagination
            total={initialPosts.posts_total}
            page={initialPage}
            size={20}
            basePath={`/u/${userId}`}
          />
        </div>
      ) : (
        <div>
          {commentLoading ? (
            <div className="panel text-center py-16">
              <p className="meta">正在加载评论…</p>
            </div>
          ) : commentData && commentData.comments.length > 0 ? (
            <>
              <div className="panel overflow-hidden p-0">
                {commentData.comments.map((c, i) => (
                  <Link
                    key={c.id}
                    href={`/post/${c.post_id}`}
                    className="block px-4 sm:px-5 py-4 transition-colors hover:bg-[var(--panel-2)]"
                    style={{ borderTop: i === 0 ? "none" : "1px solid var(--line)" }}
                  >
                    <div className="meta text-xs mb-2">
                      评论于《<span style={{ color: "var(--accent)" }}>{c.post_title}</span>》
                    </div>
                    <p
                      className="text-[15px] leading-relaxed line-clamp-2"
                      style={{ color: "var(--ink)" }}
                    >
                      {c.content}
                    </p>
                    <div className="meta text-xs mt-2">
                      {new Date(c.created_at).toLocaleString("zh-CN")}
                    </div>
                  </Link>
                ))}
              </div>
              <Pagination
                total={commentData.total}
                page={commentPage}
                size={20}
                basePath={`/u/${userId}`}
                query={{ tab: "comments" }}
                onChange={loadComments}
              />
            </>
          ) : (
            <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>
      )}
    </div>
  );
}