import type { Metadata } from "next";
import { redirect } from "next/navigation";

import { formatLocalDateTime } from "@/lib/datetime";
import { getRequestOrigin } from "@/lib/request-origin";
import { buildSubscriptionUrl, describeRemainingTraffic } from "@/lib/subscription";
import { requireUserSession } from "@/lib/session";
import { formatBytes, getUserById } from "@/lib/store";

export const metadata: Metadata = {
  title: "我的订阅",
};

export default async function MePage() {
  const session = await requireUserSession();
  const [user, origin] = await Promise.all([
    getUserById(session.user_id),
    getRequestOrigin(),
  ]);

  if (!user) {
    redirect("/login");
  }

  const usedBytes = user.used_tx_bytes + user.used_rx_bytes;
  const subscriptionUrl = user.subscription_token
    ? buildSubscriptionUrl(user.subscription_token, origin)
    : null;
  const clashImportUrl = subscriptionUrl
    ? `clash://install-config?url=${encodeURIComponent(subscriptionUrl)}`
    : null;

  return (
    <main className="me-shell">
      <section className="me-stage">
        <article className="me-panel me-hero">
          <div className="me-hero-copy">
            <span className="eyebrow">账户中心</span>
            <h1>{user.username}</h1>
            <div className="badge-row">
              <span
                className={`status-pill ${
                  user.enabled ? "status-pill--ok" : "status-pill--danger"
                }`}
              >
                {user.enabled ? "账号已启用" : "账号已禁用"}
              </span>
              <span className="status-pill status-pill--neutral">
                {formatLocalDateTime(user.expires_at, "长期有效")}
              </span>
              <span className="status-pill status-pill--warm">
                {describeRemainingTraffic(user)}
              </span>
            </div>
          </div>
          <div className="me-identity-card">
            <span className="feature-kicker">用户 ID</span>
            <strong className="mono break-all">{user.auth_id}</strong>
            <p className="muted">
              订阅名称：{user.subscription_label || user.username}
            </p>
          </div>
        </article>

        <section className="me-grid">
          <article className="me-panel me-subscription-card">
            <div className="section-title section-title--top">
              <div>
                <span className="feature-kicker">订阅</span>
                <h2>订阅</h2>
              </div>
              <span className="status-pill status-pill--ink">Clash / Mihomo</span>
            </div>
            <div className="me-action-row">
              {clashImportUrl ? (
                <a className="primary-button me-action-button" href={clashImportUrl}>
                  一键导入
                </a>
              ) : (
                <span className="status-pill status-pill--off">订阅暂不可用</span>
              )}
              {subscriptionUrl ? (
                <a
                  className="ghost-button me-action-button"
                  href={subscriptionUrl}
                  target="_blank"
                  rel="noreferrer"
                >
                  打开订阅链接
                </a>
              ) : null}
            </div>
            <div className="me-link-card">
              <span className="feature-kicker">订阅链接</span>
              <p className="mono break-all">{subscriptionUrl ?? "暂不可用"}</p>
            </div>
          </article>

          <div className="me-side-stack">
            <article className="me-panel">
              <div className="section-title">
                <h2>流量概览</h2>
              </div>
              <div className="me-metrics-grid">
                <div className="me-metric-card me-metric-card--paper">
                  <span>总用量</span>
                  <strong>{formatBytes(usedBytes)}</strong>
                </div>
                <div className="me-metric-card me-metric-card--warm">
                  <span>剩余额度</span>
                  <strong>{describeRemainingTraffic(user)}</strong>
                </div>
                <div className="me-metric-card me-metric-card--ink">
                  <span>上传</span>
                  <strong>{formatBytes(user.used_tx_bytes)}</strong>
                </div>
                <div className="me-metric-card me-metric-card--sage">
                  <span>下载</span>
                  <strong>{formatBytes(user.used_rx_bytes)}</strong>
                </div>
              </div>
            </article>

            <article className="me-panel me-support-card">
              <span className="feature-kicker">账户</span>
              <h2>账户</h2>
              <form action="/logout" method="post">
                <button className="ghost-button me-action-button me-action-button--full" type="submit">
                  退出登录
                </button>
              </form>
            </article>
          </div>
        </section>
      </section>
    </main>
  );
}