import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";

export interface SessionsSummary {
  count: number;
  totalDurationMs: number;
  avgDurationMs: number;
  byKind: { kind: "live" | "replay"; count: number; totalDurationMs: number }[];
  durationPerDevice: { deviceId: number; displayName: string | null; bleName: string; totalActiveMs: number }[];
}

function formatHours(ms: number): string {
  return `${(ms / 3_600_000).toFixed(1)}h`;
}

export function SessionsSummaryCards({ summary }: { summary: SessionsSummary }) {
  const liveCount = summary.byKind.find((k) => k.kind === "live")?.count ?? 0;
  const replayCount = summary.byKind.find((k) => k.kind === "replay")?.count ?? 0;

  return (
    <div className="flex flex-col gap-4">
      <div className="grid gap-4 sm:grid-cols-3">
        <Card className="bp-glass">
          <CardHeader>
            <CardTitle className="text-sm text-muted-foreground">Completed sessions</CardTitle>
          </CardHeader>
          <CardContent className="bp-readout text-3xl">{summary.count}</CardContent>
        </Card>
        <Card className="bp-glass">
          <CardHeader>
            <CardTitle className="text-sm text-muted-foreground">Total time</CardTitle>
          </CardHeader>
          <CardContent className="bp-readout text-3xl">{formatHours(summary.totalDurationMs)}</CardContent>
        </Card>
        <Card className="bp-glass">
          <CardHeader>
            <CardTitle className="text-sm text-muted-foreground">Avg session length</CardTitle>
          </CardHeader>
          <CardContent className="bp-readout text-3xl">
            {Math.round(summary.avgDurationMs / 60_000)}m
          </CardContent>
        </Card>
      </div>
      <p className="text-sm text-muted-foreground">
        {liveCount} live · {replayCount} replay
      </p>
      {summary.durationPerDevice.length > 0 && (
        <Card className="bp-glass">
          <CardHeader>
            <CardTitle className="text-base">Duration per device</CardTitle>
          </CardHeader>
          <CardContent className="flex flex-col gap-2">
            {summary.durationPerDevice.map((d) => (
              <div key={d.deviceId} className="flex items-center justify-between text-sm">
                <span>{d.displayName ?? d.bleName}</span>
                <span className="text-muted-foreground">{formatHours(d.totalActiveMs)}</span>
              </div>
            ))}
          </CardContent>
        </Card>
      )}
    </div>
  );
}