import { Card } from "@heroui/react";
import { Thunderbolt, PlugConnection, CreditCard, ChartColumn } from "@gravity-ui/icons";
import { api } from "@/lib/api";

export const dynamic = "force-dynamic";

type CardColor = "accent" | "success" | "warning" | "default";

const colorStyles: Record<CardColor, { border: string; bg: string; icon: string }> = {
  accent: { border: "border-accent", bg: "bg-accent/10", icon: "text-accent" },
  success: { border: "border-success", bg: "bg-success/10", icon: "text-success" },
  warning: { border: "border-warning", bg: "bg-warning/10", icon: "text-warning" },
  default: { border: "border-border", bg: "bg-default", icon: "text-muted" },
};

function StatusDot({ color }: { color: "success" | "warning" | "muted" }) {
  const cls =
    color === "success" ? "bg-success" : color === "warning" ? "bg-warning" : "bg-muted/40";
  return <span className={`inline-block h-1.5 w-1.5 shrink-0 rounded-full ${cls}`} />;
}

function StatCard({
  title,
  value,
  footer,
  icon: Icon,
  color = "default",
}: {
  title: string;
  value: string | number;
  footer?: React.ReactNode;
  icon?: React.ComponentType<{ className?: string }>;
  color?: CardColor;
}) {
  const s = colorStyles[color];
  return (
    <Card className={`border-t-2 ${s.border}`}>
      <Card.Content className="flex flex-col gap-3">
        <div className="flex items-start justify-between gap-2">
          <p className="text-sm text-muted">{title}</p>
          {Icon && (
            <div className={`flex size-9 shrink-0 items-center justify-center rounded-xl ${s.bg}`}>
              <Icon className={`size-4.5 ${s.icon}`} />
            </div>
          )}
        </div>
        <p className="text-3xl font-bold tabular-nums leading-none text-foreground">{value}</p>
        {footer && (
          <div className="flex flex-wrap items-center gap-x-1.5 gap-y-1 text-xs text-muted">
            {footer}
          </div>
        )}
      </Card.Content>
    </Card>
  );
}

export default async function DashboardPage() {
  const stats = await api.stats.get().catch(() => null);

  const todayKwh = stats ? (stats.todayEnergyWh / 1000).toFixed(1) : "—";
  const offlineCount = (stats?.totalChargePoints ?? 0) - (stats?.onlineChargePoints ?? 0);

  return (
    <div className="space-y-6">
      <div>
        <h1 className="text-xl font-semibold text-foreground">概览</h1>
        <p className="mt-0.5 text-sm text-muted">实时运营状态</p>
      </div>

      <div className="grid grid-cols-1 gap-4 sm:grid-cols-2 xl:grid-cols-5">
        <StatCard
          title="充电桩总数"
          value={stats?.totalChargePoints ?? "—"}
          icon={PlugConnection}
          color="accent"
          footer={
            <>
              <StatusDot color="success" />
              <span className="font-medium text-success">
                {stats?.onlineChargePoints ?? 0} 在线
              </span>
              <span className="text-border">·</span>
              <span>{offlineCount} 离线</span>
            </>
          }
        />
        <StatCard
          title="在线充电桩"
          value={stats?.onlineChargePoints ?? "—"}
          icon={PlugConnection}
          color="success"
          footer={<span>最近 2 分钟有心跳</span>}
        />
        <StatCard
          title="进行中充电"
          value={stats?.activeTransactions ?? "—"}
          icon={Thunderbolt}
          color={stats?.activeTransactions ? "warning" : "default"}
          footer={
            <>
              <StatusDot color={stats?.activeTransactions ? "success" : "muted"} />
              <span className={stats?.activeTransactions ? "font-medium text-success" : ""}>
                {stats?.activeTransactions ? "活跃中" : "当前空闲"}
              </span>
            </>
          }
        />
        <StatCard
          title="储值卡总数"
          value={stats?.totalIdTags ?? "—"}
          icon={CreditCard}
          color="default"
          footer={<span>已注册卡片总量</span>}
        />
        <StatCard
          title="今日充电量"
          value={`${todayKwh} kWh`}
          icon={ChartColumn}
          color="accent"
          footer={<span>当日 00:00 起累计</span>}
        />
      </div>
    </div>
  );
}