import Link from "next/link";
import { Button } from "@/components/ui/button";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { BrandMark } from "@/components/layout/BrandMark";
import { listSessions } from "@/lib/db/queries/sessions";
import { getSessionsSummary } from "@/lib/db/queries/stats";

// Always reflects live DB state for an authenticated, single-tenant app -
// never worth prerendering (and the DB file doesn't exist at build time).
export const dynamic = "force-dynamic";

export default async function DashboardPage() {
  const [sessions, summary] = await Promise.all([listSessions(), getSessionsSummary()]);

  const recentSessions = [...sessions].reverse().slice(0, 5);

  return (
    <div className="flex flex-col gap-8">
      <Card className="bp-glass overflow-hidden">
        <CardContent className="flex flex-col items-start gap-4 py-8">
          <BrandMark size={48} animated className="rounded-[9px]" />
          <h1 className="font-heading text-3xl font-semibold">Welcome back</h1>
          <p className="max-w-xl text-sm text-muted-foreground">
            Scan for nearby devices, take control, and replay completed sessions later - all running
            directly from your browser over Web Bluetooth.
          </p>
          <Button asChild size="lg">
            <Link href="/control">Start a session</Link>
          </Button>
        </CardContent>
      </Card>

      <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 play time</CardTitle>
          </CardHeader>
          <CardContent className="bp-readout text-3xl">
            {(summary.totalDurationMs / 3_600_000).toFixed(1)}h
          </CardContent>
        </Card>
        <Card className="bp-glass">
          <CardHeader>
            <CardTitle className="text-sm text-muted-foreground">Replays</CardTitle>
          </CardHeader>
          <CardContent className="bp-readout text-3xl">{summary.totalReplays}</CardContent>
        </Card>
      </div>

      <Card className="bp-glass">
        <CardHeader>
          <CardTitle>Recent sessions</CardTitle>
        </CardHeader>
        <CardContent className="flex flex-col">
          {recentSessions.length === 0 && <p className="text-sm text-muted-foreground">No sessions yet.</p>}
          {recentSessions.map((s, i) => (
            <Link key={s.id} href={`/sessions/${s.id}`} className="group">
              {i > 0 && <div className="bp-hairline" />}
              <div className="flex items-center justify-between px-1 py-2 text-sm">
                <span className="group-hover:text-primary">{s.name ?? `Session #${s.id}`}</span>
                <span className="bp-readout text-xs text-muted-foreground">
                  {new Date(s.startedAt).toLocaleDateString()}
                </span>
              </div>
            </Link>
          ))}
        </CardContent>
      </Card>
    </div>
  );
}