import { Activity, Film, Loader2, Zap } from "lucide-react"
import { useDashboard } from "@/lib/dashboard"
import { mediaUrl } from "@/lib/api"
import { Badge } from "@/components/ui/badge"
import { cn } from "@/lib/utils"

function Stat({
  label,
  value,
  accent,
}: {
  label: string
  value: string
  accent?: boolean
}) {
  return (
    <div className="rounded-lg border border-border bg-black/20 px-4 py-3">
      <div className="font-mono text-[0.625rem] uppercase tracking-[0.16em] text-muted-foreground">
        {label}
      </div>
      <div
        className={cn(
          "mt-1 font-display text-2xl font-semibold tabular-nums",
          accent ? "text-primary" : "text-foreground",
        )}
      >
        {value}
      </div>
    </div>
  )
}

export function PreviewPanel() {
  const { result, running, videoPreviewUrl } = useDashboard()
  const fired = result?.status === "fired"
  const src = result ? mediaUrl(result.video_url) : videoPreviewUrl

  return (
    <div className="space-y-4">
      <div className="group relative aspect-video overflow-hidden rounded-lg border border-border bg-black">
        {/* scanline / grid atmosphere */}
        <div
          className="pointer-events-none absolute inset-0 opacity-[0.07]"
          style={{
            backgroundImage:
              "linear-gradient(oklch(1 0 0 / 0.5) 1px, transparent 1px), linear-gradient(90deg, oklch(1 0 0 / 0.5) 1px, transparent 1px)",
            backgroundSize: "32px 32px",
          }}
        />

        {src ? (
          <video
            key={src}
            src={src}
            controls
            autoPlay
            loop
            muted
            playsInline
            className="absolute inset-0 size-full object-contain"
          />
        ) : (
          <div className="absolute inset-0 flex flex-col items-center justify-center gap-3 text-muted-foreground">
            <Film className="size-8 opacity-40" />
            <p className="text-sm">Upload a clip and run detection to see the annotated replay</p>
          </div>
        )}

        {/* top HUD */}
        <div className="pointer-events-none absolute inset-x-0 top-0 flex items-start justify-between p-3">
          <div className="flex gap-2">
            {result?.classes?.slice(0, 4).map((c) => (
              <span
                key={c}
                className="rounded-md border border-white/10 bg-black/50 px-2 py-1 font-mono text-[0.625rem] uppercase tracking-wider text-white/70 backdrop-blur-sm"
              >
                {c}
              </span>
            ))}
          </div>
          {result &&
            (fired ? (
              <Badge variant="live">
                <span className="size-1.5 rounded-full bg-primary signal-dot" />
                automation fired
              </Badge>
            ) : (
              <Badge variant="warning">no match</Badge>
            ))}
        </div>

        {/* running overlay */}
        {running && (
          <div className="absolute inset-0 flex items-center justify-center bg-black/60 backdrop-blur-sm">
            <div className="flex flex-col items-center gap-3 text-primary">
              <Loader2 className="size-7 animate-spin" />
              <span className="font-mono text-xs uppercase tracking-widest">running inference</span>
            </div>
          </div>
        )}

        {/* fired banner */}
        {fired && result && (
          <div className="absolute inset-x-0 bottom-0 flex items-center justify-between gap-3 bg-gradient-to-t from-primary/90 to-primary/70 px-4 py-2.5 text-primary-foreground">
            <div className="flex items-center gap-2 text-sm font-semibold">
              <Zap className="size-4" />
              {result.events[0]?.rule} → {result.events[0]?.action}
            </div>
            <span className="font-mono text-xs tabular-nums">
              {result.events[0]?.timestamp_sec.toFixed(1)}s
            </span>
          </div>
        )}
      </div>

      {/* stat strip */}
      <div className="grid grid-cols-2 gap-3 sm:grid-cols-4">
        <Stat label="Detections" value={result ? `${result.stats.detections}` : "—"} />
        <Stat label="Rules" value={result ? `${result.stats.rules}` : "—"} />
        <Stat label="Actions" value={result ? `${result.stats.actions}` : "—"} accent={fired} />
        <Stat
          label="Frames"
          value={result ? `${result.stats.processed_frames}` : "—"}
        />
      </div>

      {!result && (
        <div className="flex items-center gap-2 text-xs text-muted-foreground">
          <Activity className="size-3.5" />
          Engine idle — awaiting first run.
        </div>
      )}
    </div>
  )
}