"use client";

import { useState } from "react";
import Link from "next/link";
import { CalendarDays, CalendarCheck, LogIn, Loader2 } from "lucide-react";
import { apiDoCheckin, type CheckinStatus } from "@/lib/api";

/**
 * 每日签到紧凑条，内嵌在右栏「站点数据」卡底部。
 * initial 为 undefined 表示游客；否则为 SSR 注入的登录用户签到状态。
 */
export function PulseCheckin({ initial }: { initial?: CheckinStatus | null }) {
  const [status, setStatus] = useState<CheckinStatus | null>(initial ?? null);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState("");

  const checked = status?.checked_today ?? false;
  const guest = initial === undefined;

  async function doCheckin() {
    if (loading || checked) return;
    setLoading(true);
    setError("");
    try {
      setStatus(await apiDoCheckin());
    } catch (e) {
      setError(e instanceof Error ? e.message : "签到失败");
    } finally {
      setLoading(false);
    }
  }

  return (
    <div aria-label="每日签到">
      <div className="flex items-center gap-2.5">
        <span
          className="flex h-8 w-8 shrink-0 items-center justify-center rounded-lg"
          style={{
            background: checked || guest ? "var(--accent-soft)" : "var(--tint)",
            color: checked || guest ? "var(--accent)" : "var(--ink-2)",
          }}
        >
          {checked ? <CalendarCheck size={16} /> : <CalendarDays size={16} />}
        </span>
        <div className="min-w-0 flex-1">
          <p className="text-[12.5px] font-bold leading-tight" style={{ color: "var(--ink)" }}>
            每日签到
          </p>
          <p className="meta mt-0.5 truncate text-[11px]">
            {guest
              ? "登录后每日签到领积分"
              : checked
                ? `连签 ${status?.streak ?? 0} 天 · 累计 ${status?.total_points ?? 0} 积分`
                : `连签 ${status?.streak ?? 0} 天 · 今日 +${status?.today_points ?? 5}`}
          </p>
        </div>
        {guest ? (
          <Link
            href="/login?redirect=/"
            className="btn btn-line btn-sm j13-pulse-checkin-btn shrink-0"
          >
            <LogIn size={13} /> 登录
          </Link>
        ) : checked ? (
          <span
            className="j13-pulse-checkin-done shrink-0"
            style={{ background: "var(--accent-soft)", color: "var(--accent)" }}
          >
            <CalendarCheck size={12.5} /> 已签
          </span>
        ) : (
          <button
            type="button"
            onClick={doCheckin}
            disabled={loading}
            className="btn btn-primary btn-sm j13-pulse-checkin-btn shrink-0"
          >
            {loading ? (
              <>
                <Loader2 size={13} className="animate-spin" /> 签到中
              </>
            ) : (
              `签到 +${status?.today_points ?? 5}`
            )}
          </button>
        )}
      </div>
      {error && (
        <p className="mt-1.5 text-[11.5px]" style={{ color: "var(--clay)" }} role="alert">
          {error}
        </p>
      )}
    </div>
  );
}