import Link from "next/link";
import { cookies, headers } 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, fetchLoginDevices,
  type UserProfile, type UserCommentsResponse, type LoginDevice,
} from "@/lib/api";
import { authCookieHeader, sessionCookieHeader } from "@/lib/cookies";
import { getMeCached, getPublicSettingsCached } from "@/lib/serverData";
import UserProfileContent from "./UserProfileContent";
import ProfileForm from "./ProfileForm";
import PasswordForm from "./PasswordForm";
import LoginDevices from "./LoginDevices";
import ProfileHeroAvatar from "./ProfileHeroAvatar";
import RoleBadge from "@/components/RoleBadge";
import { roleMeta } from "@/lib/roles";
import StartDMButton from "./StartDMButton";
import StaffUserMenu from "@/components/StaffUserMenu";
import { requestCanonical } from "@/lib/canonicalMeta";
import { absoluteCanonical, canonicalPage } from "@/lib/siteUrl";
import { profileJsonLd } from "@/lib/jsonLd";
import JsonLd from "@/components/JsonLd";

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

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

export async function generateMetadata({ params, searchParams }: UserPageProps): Promise<Metadata> {
  const { id } = await params;
  const sp = await searchParams;
  const rawTab = sp.tab;
  const tab: UserTab =
    rawTab === "comments" ? "comments" :
    rawTab === "settings" ? "settings" :
    rawTab === "security" ? "security" : "posts";
  try {
    const data = await fetchUserProfile(id, 1);
    const allowComments = (await getPublicSettingsCached()).allow_comments !== false;
    const title = data.user.nickname || data.user.username;
    const description = allowComments
      ? `查看 ${data.user.nickname} 的资料、发帖与评论`
      : `查看 ${data.user.nickname} 的资料与发帖`;
    // 资料/安全 tab 仅本人可见，不声明 Canonical，避免被当成公开资料页或继承首页
    if (tab === "settings" || tab === "security") {
      return { title, description };
    }
    const query: Record<string, string | number> = {};
    if (allowComments && tab === "comments") query.tab = "comments";
    const page = canonicalPage(sp.page);
    if (page) query.page = page;
    return {
      title,
      description,
      ...(await requestCanonical(`/u/${data.user.id}`, query)),
    };
  } 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;
    }
  }

  // 安全设置：仍有效的登录会话（仅本人）
  // SSR 直连后端时必须转发 refresh cookie + 浏览器 UA/IP，才能标「当前在线」并避免把 Node fetch 当成一台设备
  let loginDevices: LoginDevice[] = [];
  if (effectiveTab === "security" && isOwner) {
    try {
      const hdrs = await headers();
      const sessionCookie = sessionCookieHeader(await cookies());
      loginDevices = await fetchLoginDevices(sessionCookie || cookie || undefined, {
        userAgent: hdrs.get("user-agent") || undefined,
        clientIP: hdrs.get("x-forwarded-for")?.split(",")[0]?.trim()
          || hdrs.get("x-real-ip")
          || undefined,
      });
    } catch {
      loginDevices = [];
    }
  }

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

  // 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}`);

  const profileQuery: Record<string, string | number> = {};
  if (allowComments && effectiveTab === "comments") profileQuery.tab = "comments";
  if (page > 1) profileQuery.page = page;
  const profileLd =
    effectiveTab === "settings" || effectiveTab === "security"
      ? null
      : profileJsonLd({
          id: u.id,
          name: u.nickname || u.username,
          username: u.username,
          signature: (u.signature || "").trim() || undefined,
          pageUrl: absoluteCanonical(`/u/${u.id}`, profileQuery),
        });

  /** 本页卡片统一阴影；暗色随 color-mix 自动加深 */
  const cardShadow = "0 1px 3px color-mix(in srgb, #000 18%, transparent)";

  return (
    <div>
      <JsonLd data={profileLd} />
      <nav className="meta -mt-4 sm:-mt-6 mb-1.5 flex items-center gap-1 text-[12.5px] leading-none">
        <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：头像 + 昵称 + 简介 + 行内统计，约 120px 高 ═══ */}
      <section
        className="panel relative mb-5 transition-[background-color,box-shadow] duration-150"
        style={{ boxShadow: cardShadow }}
      >
        {/* 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：绝对定位在卡片右上角 */}
        {isOwner ? (
          <div className="absolute top-3 right-3 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 duration-150 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 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,
                avatar: u.avatar,
                created_at: u.created_at,
                points: data.stats.points,
              }}
            />
            {allowMessages ? <StartDMButton userId={data.user.id} /> : null}
          </div>
        ) : null}

        {/* 身份 + 行内统计：垂直居中，高度约 120px */}
        <div
          className={`relative z-10 flex min-h-[120px] items-center gap-3.5 px-5 sm:px-6 py-3.5 ${
            hasHeroActions ? "pr-24 sm:pr-32" : ""
          }`}
        >
          <ProfileHeroAvatar
            name={u.nickname || u.username}
            src={u.avatar || undefined}
          />
          <div className="flex-1 min-w-0">
            <div className="flex items-center gap-2 flex-wrap">
              <h1
                className="text-[18px] sm:text-[20px] 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="mt-1.5 text-[14px] leading-snug flex flex-wrap items-center" style={{ color: "var(--ink-2)" }}>
              <span>
                <span className="tabular-nums font-semibold" style={{ color: "var(--ink)" }}>{data.stats.post_count}</span>
                {" "}帖子
              </span>
              {allowComments && (
                <>
                  <span aria-hidden className="mx-1.5">·</span>
                  <span>
                    <span className="tabular-nums font-semibold" style={{ color: "var(--ink)" }}>{data.stats.comment_count}</span>
                    {" "}评论
                  </span>
                </>
              )}
              <span aria-hidden className="mx-1.5">·</span>
              <span>
                <span className="tabular-nums font-semibold" style={{ color: "var(--ink)" }}>{data.stats.points}</span>
                {" "}积分
              </span>
              {data.stats.streak > 0 && (
                <>
                  <span aria-hidden className="mx-1.5">·</span>
                  <span className="inline-flex items-center gap-0.5 font-semibold" style={{ color: "var(--gold)" }}>
                    <Flame size={13} />
                    {data.stats.streak}天连签
                  </span>
                </>
              )}
            </p>
            {u.signature && (
              <p
                className="mt-1 text-[13px] leading-snug line-clamp-1"
                style={{ color: "var(--ink-2)" }}
              >
                {u.signature}
              </p>
            )}
          </div>
        </div>
      </section>

      {/* 移动端 Tab chips（md 以下，约 768px） */}
      <div className="md: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 240 / 中自适应 / 右 300；md 以下侧栏折叠 ═══ */}
      <div className="grid grid-cols-1 items-start md:grid-cols-[240px_minmax(0,1fr)_300px] gap-x-6 xl:gap-x-7">
        {/* 左栏：Tab 导航 */}
        <aside className="hidden md:flex w-[240px] shrink-0 sticky top-[var(--rail-top)] flex-col gap-4">
          <section
            className="j13-module !p-2 transition-[background-color,box-shadow] duration-150"
            style={{ boxShadow: cardShadow }}
          >
            <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 />
              <LoginDevices devices={loginDevices} />
            </div>
          ) : null}
        </div>

        {/* 右栏：账号信息 + 积分 + 安全提示 */}
        <aside className="hidden md:flex w-[300px] shrink-0 sticky top-[var(--rail-top)] flex-col gap-4 max-h-[var(--rail-max-h)] overflow-hidden">
          <section
            className="j13-module !p-4 transition-[background-color,box-shadow] duration-150 hover:bg-[color-mix(in_srgb,var(--ink)_2%,var(--panel))]"
            style={{ boxShadow: cardShadow }}
          >
            <p className="j13-module-title mb-2.5">
              <Hash size={15} style={{ color: "var(--accent)" }} /> 账号信息
            </p>
            <div className="flex flex-col gap-2">
              <div>
                <p className="text-[11px] leading-none" style={{ color: "var(--ink-3)" }}>用户名</p>
                <p className="text-[13px] font-semibold mt-1" style={{ color: "var(--ink)" }}>
                  {u.username}
                </p>
              </div>
              <div>
                <p className="text-[11px] leading-none flex items-center gap-1" style={{ color: "var(--ink-3)" }}>
                  <Calendar size={11} /> 注册时间
                </p>
                <p className="text-[13px] font-semibold mt-1 tabular-nums" style={{ color: "var(--ink)" }}>
                  {joinDate}
                </p>
              </div>
              <div>
                <p className="text-[11px] leading-none flex items-center gap-1" style={{ color: "var(--ink-3)" }}>
                  <Shield size={11} /> 角色
                </p>
                <p className="text-[13px] font-semibold mt-1" style={{ color: "var(--ink)" }}>
                  {roleMeta(u.role).label}
                </p>
              </div>
              <div>
                <p className="text-[11px] leading-none" style={{ color: "var(--ink-3)" }}>用户 ID</p>
                <p className="text-[13px] font-semibold mt-1 tabular-nums" style={{ color: "var(--ink)" }}>
                  #{u.id}
                </p>
              </div>
            </div>
          </section>

          {showPoints && (
            <section
              className="j13-module !p-4 transition-[background-color,box-shadow] duration-150"
              style={{
                boxShadow: cardShadow,
                background: "color-mix(in srgb, var(--accent) 7%, var(--panel))",
              }}
            >
              <div className="flex items-center justify-between gap-2">
                <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-0.5 rounded px-1.5 py-0.5 text-[11px] font-semibold tabular-nums"
                    style={{
                      background: "color-mix(in srgb, var(--gold) 16%, var(--panel))",
                      color: "var(--gold)",
                    }}
                  >
                    <Flame size={11} />
                    {data.stats.streak}天连签
                  </span>
                )}
              </div>
              <p
                className="mt-2.5 text-[28px] font-bold 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-[13px] font-semibold transition-colors duration-150 hover:text-[var(--accent-hi)]"
                  style={{ color: "var(--accent)" }}
                >
                  查看流水 →
                </Link>
              )}
            </section>
          )}

          {isOwner && (effectiveTab === "settings" || effectiveTab === "security") && (
            <section
              className="j13-module !p-4 transition-[background-color,box-shadow] duration-150 hover:bg-[color-mix(in_srgb,var(--ink)_2%,var(--panel))]"
              style={{ boxShadow: cardShadow }}
            >
              <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>
                {effectiveTab === "security" && (
                  <li className="flex gap-2">
                    <span className="shrink-0 mt-px" style={{ color: "var(--accent)" }}>·</span>
                    <span>「当前在线」是你正在看的这台设备；其它仍有效的登录标「在线」，可剔除后需重新输入密码。</span>
                  </li>
                )}
              </ul>
            </section>
          )}
        </aside>
      </div>
    </div>
  );
}