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

export interface SessionsSummary {
  count: number;
  totalDurationMs: number;
  avgDurationMs: number;
  totalReplays: number;
}

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

function formatReplays(count: number): string {
  return count === 0 ? "-" : `${count}×`;
}

export function SessionsSummaryCards({ summary }: { summary: SessionsSummary }) {
  return (
    <div className="grid gap-4 sm:grid-cols-2 lg:grid-cols-4">
      <Card className="bp-glass">
        <CardHeader>
          <CardTitle className="text-sm">Completed sessions</CardTitle>
        </CardHeader>
        <CardContent className="bp-readout text-3xl">{summary.count}</CardContent>
      </Card>
      <Card className="bp-glass">
        <CardHeader>
          <CardTitle className="text-sm">Total time</CardTitle>
        </CardHeader>
        <CardContent className="bp-readout text-3xl">{formatHours(summary.totalDurationMs)}</CardContent>
      </Card>
      <Card className="bp-glass">
        <CardHeader>
          <CardTitle className="text-sm">Avg session length</CardTitle>
        </CardHeader>
        <CardContent className="bp-readout text-3xl">
          {Math.round(summary.avgDurationMs / 60_000)}m
        </CardContent>
      </Card>
      <Card className="bp-glass">
        <CardHeader>
          <CardTitle className="text-sm">Replays</CardTitle>
        </CardHeader>
        <CardContent className="bp-readout text-3xl">{formatReplays(summary.totalReplays)}</CardContent>
      </Card>
    </div>
  );
}