import Link from "next/link";
import { cookies } from "next/headers";
import { Metadata } from "next";
import {
  ChevronRight, FileText, MessageCircle, Flame, Calendar, Hash, Shield,
  Settings, KeyRound, Info, PenLine,
} from "lucide-react";
import { fetchUserProfile, fetchUserComments, type UserProfile, type UserCommentsResponse } from "@/lib/api";
import { authCookieHeader } from "@/lib/cookies";
import { getMeCached, getPublicSettingsCached } from "@/lib/serverData";
import UserProfileContent from "./UserProfileContent";
import ProfileForm from "./ProfileForm";
import PasswordForm from "./PasswordForm";
import Avatar from "@/components/Avatar";
import RoleBadge from "@/components/RoleBadge";
import { roleMeta } from "@/lib/roles";
import StartDMButton from "./StartDMButton";
import StaffUserMenu from "@/components/StaffUserMenu";

interface UserPageProps {
  params: Promise<{ id: string }>;
  searchParams: Promise<{ page?: string; tab?: string }>;
}

export type UserTab = "posts" | "comments" | "settings" | "security";

export async function generateMetadata({ params }: UserPageProps): Promise<Metadata> {
  const { id } = await params;
  try {
    const data = await fetchUserProfile(id, 1);
    const allowComments = (await getPublicSettingsCached()).allow_comments !== false;
    return {
      title: data.user.nickname || data.user.username,
      description: allowComments
        ? `查看 ${data.user.nickname} 的资料、发帖与评论`
        : `查看 ${data.user.nickname} 的资料与发帖`,
    };
  } catch {
    return { title: "用户不存在" };
  }
}

// 装饰几何色：全部由主题变量派生，浅色为淡靛、暗色自动提亮
const ACCENT_RING_1 = "color-mix(in srgb, var(--accent) 14%, transparent)";
const ACCENT_RING_2 = "color-mix(in srgb, var(--accent) 9%, transparent)";

export default async function UserPage({ params, searchParams }: UserPageProps) {
  const { id } = await params;
  const sp = await searchParams;
  const page = Math.max(1, parseInt(sp.page || "1", 10) || 1);
  const rawTab = sp.tab;
  const tab: UserTab =
    rawTab === "comments" ? "comments" :
    rawTab === "settings" ? "settings" :
    rawTab === "security" ? "security" : "posts";

  const cookie = authCookieHeader(await cookies());
  const me = await getMeCached(cookie || undefined);
  const settings = await getPublicSettingsCached();
  const allowComments = settings.allow_comments !== false;
  const allowMessages = settings.allow_messages !== false;

  let data: UserProfile;
  try {
    // 带 cookie：超管/站长才能拿到 banned 字段
    data = await fetchUserProfile(id, page, cookie || undefined);
  } catch {
    return (
      <div className="max-w-md mx-auto text-center py-24">
        <p className="text-lg font-extrabold mb-1.5" style={{ color: "var(--ink)" }}>
          用户不存在
        </p>
        <p className="meta mb-5">该用户可能已注销或链接有误</p>
        <Link href="/" className="btn btn-line btn-sm">
          返回首页
        </Link>
      </div>
    );
  }

  // 判断是否本人（决定能否看到 settings / security tab）
  const isOwner = me.user?.id === data.user.id;
  const currentUser = me.user;
  let effectiveTab: UserTab =
    (tab === "settings" || tab === "security") && !isOwner ? "posts" : tab;
  if (!allowComments && effectiveTab === "comments") effectiveTab = "posts";

  // 评论 tab：SSR 直出对应分页
  let commentData: UserCommentsResponse | null = null;
  let commentError = false;
  if (allowComments && effectiveTab === "comments") {
    try {
      commentData = await fetchUserComments(id, page);
    } catch {
      commentError = true;
    }
  }

  const u = data.user;
  const joinDate = new Date(u.created_at).toLocaleDateString("zh-CN");
  const showPoints = data.stats.points > 0 || isOwner;

  // 导航项（桌面左栏 / 移动 chips 共用定义）
  const navItems: { key: UserTab; label: string; count?: number; icon: React.ReactNode; ownerOnly?: boolean }[] = [
    { key: "posts", label: "发帖", count: data.stats.post_count, icon: <FileText size={15} /> },
    ...(allowComments
      ? [{ key: "comments" as const, label: "评论", count: data.stats.comment_count, icon: <MessageCircle size={15} /> }]
      : []),
    { key: "settings", label: "资料设置", icon: <Settings size={15} />, ownerOnly: true },
    { key: "security", label: "安全设置", icon: <KeyRound size={15} />, ownerOnly: true },
  ];
  const visibleNav = navItems.filter((t) => !t.ownerOnly || isOwner);
  const tabHref = (t: UserTab) => (t === "posts" ? `/u/${id}` : `/u/${id}?tab=${t}`);

  // 统计条数据
  const heroStats = [
    { label: "发帖", value: data.stats.post_count },
    ...(allowComments ? [{ label: "评论", value: data.stats.comment_count }] : []),
    { label: "积分", value: data.stats.points, foot: data.stats.streak > 0 ? `连签 ${data.stats.streak} 天` : undefined },
  ];

  return (
    <div>
      <nav className="meta mb-5 flex items-center gap-1.5 text-[13px]">
        <Link href="/" className="hover:text-[var(--accent)] transition-colors">首页</Link>
        <ChevronRight size={13} />
        <span style={{ color: "var(--accent)" }}>{u.nickname || u.username}</span>
      </nav>

      {/* ═══ Hero：石墨面板 + 淡靛几何装饰 + 身份信息 + 统计条 ═══ */}
      <section className="panel relative mb-6">
        {/* 装饰层单独裁圆角，避免 overflow-hidden 裁掉管理下拉菜单 */}
        <div aria-hidden className="pointer-events-none absolute inset-0 overflow-hidden rounded-[inherit]">
          <span
            className="absolute -top-28 -right-24 w-[440px] h-[440px] rounded-full"
            style={{ background: "radial-gradient(circle, var(--accent-soft) 0%, transparent 68%)" }}
          />
          <span
            className="absolute -top-[150px] -right-[52px] w-[390px] h-[390px] rounded-full border"
            style={{ borderColor: ACCENT_RING_1 }}
          />
          <span
            className="absolute -top-[96px] -right-[8px] w-[290px] h-[290px] rounded-full border"
            style={{ borderColor: ACCENT_RING_2 }}
          />
        </div>

        {/* 本人操作按钮 / 访客私聊 */}
        {isOwner ? (
          <div className="absolute top-3 right-3 sm:top-4 sm:right-4 z-20 flex items-center gap-2">
            <Link href={`/u/${id}?tab=settings`} className="btn btn-line btn-sm">
              <PenLine size={13.5} />
              <span className="hidden sm:inline">编辑资料</span>
            </Link>
            <Link
              href={`/u/${id}?tab=security`}
              aria-label="安全设置"
              data-tip="安全设置"
              className="inline-flex w-8 h-8 items-center justify-center rounded-full border transition-colors hover:border-[var(--accent)] hover:text-[var(--accent)]"
              style={{ background: "var(--panel)", borderColor: "var(--line-2)", color: "var(--ink-2)" }}
            >
              <Shield size={14} />
            </Link>
          </div>
        ) : currentUser ? (
          <div className="absolute top-3 right-3 sm:top-4 sm:right-4 z-20 flex items-center gap-2">
            <StaffUserMenu
              target={{
                id: u.id,
                username: u.username,
                nickname: u.nickname,
                role: u.role,
                board_ids: u.board_ids,
                banned: u.banned,
              }}
            />
            {allowMessages ? <StartDMButton userId={data.user.id} /> : null}
          </div>
        ) : null}

        {/* 身份信息：纯文档流，头像 + 右侧文字 baseline 对齐 */}
        <div className="relative z-10 px-5 sm:px-7 pt-5 sm:pt-6">
          <div className="flex items-center gap-4">
            <span
              className="inline-flex items-center justify-center shrink-0 rounded-full p-0"
              style={{
                width: 80,
                height: 80,
                lineHeight: 0,
                boxShadow:
                  "0 0 0 4px var(--panel), 0 0 0 6px color-mix(in srgb, var(--accent) 38%, transparent)",
              }}
            >
              <Avatar
                name={u.nickname || u.username}
                src={u.avatar || undefined}
                size={80}
              />
            </span>
            <div className="flex-1 min-w-0">
              <div className="flex items-center gap-2 flex-wrap">
                <h1
                  className="text-[19px] sm:text-[22px] font-extrabold tracking-tight leading-tight truncate"
                  style={{ color: "var(--ink)" }}
                >
                  {u.nickname || u.username}
                </h1>
                {u.role !== "user" && (
                  <RoleBadge role={u.role} boardIds={u.board_ids} />
                )}
                {u.banned === true && (
                  <span
                    className="inline-flex items-center rounded-full px-2 py-0.5 text-[11px] font-semibold"
                    style={{ background: "var(--danger-soft)", color: "var(--danger)" }}
                  >
                    已封禁
                  </span>
                )}
              </div>
              <p className="meta mt-1 flex items-center gap-1.5 text-[12.5px] flex-wrap">
                <span>@{u.username}</span>
                <span aria-hidden>·</span>
                <Calendar size={12} />
                <span>{joinDate} 加入</span>
              </p>
            </div>
          </div>
          {u.signature && (
            <p
              className="mt-3.5 text-[13.5px] leading-relaxed"
              style={{ color: "var(--ink-2)" }}
            >
              {u.signature}
            </p>
          )}
        </div>

        {/* 统计条 */}
        <div
          className={`relative z-10 grid mt-4 border-t ${heroStats.length === 3 ? "grid-cols-3" : "grid-cols-2"}`}
          style={{ borderColor: "var(--line)" }}
        >
          {heroStats.map((s, i) => (
            <div
              key={s.label}
              className="px-5 sm:px-7 py-3.5"
              style={i > 0 ? { borderLeft: "1px solid var(--line)" } : undefined}
            >
              <p
                className="text-[19px] sm:text-[21px] font-extrabold leading-none tabular-nums"
                style={{ color: "var(--ink)" }}
              >
                {s.value}
              </p>
              <p className="mt-1.5 text-[11.5px] flex items-center gap-1" style={{ color: "var(--ink-3)" }}>
                {s.label}
                {s.foot && (
                  <span className="hidden sm:inline-flex items-center gap-0.5 font-semibold" style={{ color: "var(--gold)" }}>
                    <Flame size={10.5} /> {s.foot}
                  </span>
                )}
              </p>
            </div>
          ))}
        </div>
      </section>

      {/* 移动端 Tab chips（lg 以下） */}
      <div className="lg:hidden -mx-4 sm:-mx-6 px-4 sm:px-6 mb-5">
        <div className="j13-chips">
          {visibleNav.map((t) => (
            <Link
              key={t.key}
              href={tabHref(t.key)}
              className="j13-chip"
              aria-current={effectiveTab === t.key ? "page" : undefined}
            >
              {t.icon}
              {t.label}
              {t.count !== undefined && (
                <span className="tabular-nums opacity-70">{t.count}</span>
              )}
            </Link>
          ))}
        </div>
      </div>

      {/* ═══ 三栏：左导航 / 中内容 / 右信息 ═══ */}
      <div className="grid grid-cols-1 items-start lg:grid-cols-[224px_minmax(0,1fr)_280px] xl:grid-cols-[240px_minmax(0,1fr)_300px] gap-x-6 xl:gap-x-7">
        {/* 左栏：Tab 导航 */}
        <aside className="hidden lg:flex w-56 xl:w-60 shrink-0 sticky top-24 flex-col gap-4">
          <section className="j13-module !p-2">
            <p
              className="px-2.5 pt-1.5 pb-2 text-[11.5px] font-bold tracking-[0.08em] uppercase"
              style={{ color: "var(--ink-3)" }}
            >
              个人主页
            </p>
            <div className="space-y-0.5">
              {visibleNav.map((t) => (
                <Link
                  key={t.key}
                  href={tabHref(t.key)}
                  className="j13-raillink"
                  aria-current={effectiveTab === t.key ? "page" : undefined}
                >
                  {t.icon}
                  <span className="flex-1 truncate">{t.label}</span>
                  {t.count !== undefined && (
                    <span className="text-[12px] tabular-nums" style={{ color: "var(--ink-3)" }}>
                      {t.count}
                    </span>
                  )}
                </Link>
              ))}
            </div>
          </section>
        </aside>

        {/* 中栏：Tab 内容 */}
        <div className="min-w-0">
          {effectiveTab === "posts" || effectiveTab === "comments" ? (
            <UserProfileContent
              userId={id}
              profile={data}
              tab={effectiveTab}
              commentData={commentData}
              commentError={commentError}
              page={page}
              allowComments={allowComments}
            />
          ) : effectiveTab === "settings" && isOwner && currentUser ? (
            <div>
              <div className="mb-4">
                <h2 className="text-[18px] font-extrabold tracking-tight" style={{ color: "var(--ink)" }}>
                  编辑个人资料
                </h2>
                <p className="meta mt-1 text-[13px]">昵称、头像和签名会公开展示，邮箱仅你自己可见</p>
              </div>
              <ProfileForm user={currentUser} />
            </div>
          ) : effectiveTab === "security" && isOwner ? (
            <div>
              <div className="mb-4">
                <h2 className="text-[18px] font-extrabold tracking-tight" style={{ color: "var(--ink)" }}>
                  修改密码
                </h2>
                <p className="meta mt-1 text-[13px]">修改成功后将在所有设备登出，需要使用新密码重新登录</p>
              </div>
              <PasswordForm />
            </div>
          ) : null}
        </div>

        {/* 右栏：账号信息 + 积分 + 安全提示 */}
        <aside className="hidden lg:flex w-[280px] xl:w-[300px] shrink-0 sticky top-24 flex-col gap-4 max-h-[calc(100vh_-_7rem)] overflow-hidden">
          <section className="j13-module">
            <p className="j13-module-title mb-3">
              <Hash size={15} style={{ color: "var(--accent)" }} /> 账号信息
            </p>
            <div className="space-y-3">
              <div>
                <p className="j13-pulse-lab">用户名</p>
                <p className="text-[13px] font-semibold mt-0.5" style={{ color: "var(--ink)" }}>
                  {u.username}
                </p>
              </div>
              <div className="pt-3 border-t" style={{ borderColor: "var(--line)" }}>
                <p className="j13-pulse-lab">
                  <Calendar size={11.5} /> 注册时间
                </p>
                <p className="text-[13px] font-semibold mt-0.5 tabular-nums" style={{ color: "var(--ink)" }}>
                  {joinDate}
                </p>
              </div>
              <div className="pt-3 border-t" style={{ borderColor: "var(--line)" }}>
                <p className="j13-pulse-lab">
                  <Shield size={11.5} /> 角色
                </p>
                <p className="text-[13px] font-semibold mt-0.5" style={{ color: "var(--ink)" }}>
                  {roleMeta(u.role).label}
                </p>
              </div>
              <div className="pt-3 border-t" style={{ borderColor: "var(--line)" }}>
                <p className="j13-pulse-lab">用户 ID</p>
                <p className="text-[13px] font-semibold mt-0.5 tabular-nums" style={{ color: "var(--ink)" }}>
                  #{u.id}
                </p>
              </div>
            </div>
          </section>

          {showPoints && (
            <section className="j13-module">
              <div className="flex items-center justify-between">
                <p className="j13-module-title">
                  <Flame size={15} style={{ color: "var(--clay)" }} /> 积分
                </p>
                {data.stats.streak > 0 && (
                  <span
                    className="inline-flex items-center gap-1 text-[11.5px] font-bold tabular-nums"
                    style={{ color: "var(--gold)" }}
                  >
                    <Flame size={11.5} /> {data.stats.streak} 天连签
                  </span>
                )}
              </div>
              <p
                className="mt-2 text-[26px] font-extrabold tabular-nums leading-none"
                style={{ color: "var(--accent)" }}
              >
                {data.stats.points}
              </p>
              <p className="meta text-[11px] mt-1.5">可用余额</p>
              {isOwner && (
                <Link
                  href="/points"
                  className="inline-flex mt-3 text-[12.5px] font-semibold hover:text-[var(--accent)] transition-colors"
                  style={{ color: "var(--ink-2)" }}
                >
                  查看流水 →
                </Link>
              )}
            </section>
          )}

          {isOwner && (effectiveTab === "settings" || effectiveTab === "security") && (
            <section className="j13-module">
              <p className="j13-module-title mb-3">
                <Info size={15} style={{ color: "var(--accent)" }} /> 安全提示
              </p>
              <ul className="space-y-2.5 text-[12.5px] leading-relaxed" style={{ color: "var(--ink-2)" }}>
                <li className="flex gap-2">
                  <span className="shrink-0 mt-px" style={{ color: "var(--accent)" }}>·</span>
                  <span>修改密码后会立即在所有设备登出，需要重新登录。</span>
                </li>
                <li className="flex gap-2">
                  <span className="shrink-0 mt-px" style={{ color: "var(--accent)" }}>·</span>
                  <span>
                    {allowComments
                      ? "昵称和头像会公开展示在帖子、评论和个人主页。"
                      : "昵称和头像会公开展示在帖子和个人主页。"}
                  </span>
                </li>
                <li className="flex gap-2">
                  <span className="shrink-0 mt-px" style={{ color: "var(--accent)" }}>·</span>
                  <span>邮箱仅你自己可见，用于安全通知。</span>
                </li>
              </ul>
            </section>
          )}
        </aside>
      </div>
    </div>
  );
}