import { useEffect, useState } from "react";
import { Clock } from "lucide-react";
import { cn } from "../../lib/utils";

interface SessionTimerProps {
    expiresAt: string | null;
    className?: string;
}

export function SessionTimer({ expiresAt, className }: SessionTimerProps) {
    const [timeLeft, setTimeLeft] = useState<string>("--:--");
    const [isCritical, setIsCritical] = useState(false);

    useEffect(() => {
        if (!expiresAt) {
            return;
        }

        const tick = () => {
            const now = Date.now();
            const end = new Date(expiresAt).getTime();
            const diff = Math.max(0, end - now);

            if (diff <= 0) {
                setTimeLeft("Expired");
                setIsCritical(true);
                return;
            }

            const minutes = Math.floor(diff / 60000);
            const seconds = Math.floor((diff % 60000) / 1000);

            setTimeLeft(`${minutes.toString().padStart(2, "0")}:${seconds.toString().padStart(2, "0")}`);
            setIsCritical(minutes < 5);
        };

        tick();
        const interval = setInterval(tick, 1000);
        return () => clearInterval(interval);
    }, [expiresAt]);

    if (!expiresAt) {
        return null;
    }

    return (
        <div
            className={cn(
                "inline-flex items-center justify-between gap-4 rounded-[1.5rem] border px-4 py-3 shadow-[0_20px_60px_-40px_rgba(15,23,42,0.95)] backdrop-blur-xl",
                isCritical
                    ? "border-destructive/30 bg-destructive/10"
                    : "border-primary/20 bg-primary/10",
                className
            )}
        >
            <div className="flex items-center gap-3">
                <div
                    className={cn(
                        "flex h-10 w-10 items-center justify-center rounded-[1rem] border",
                        isCritical
                            ? "border-destructive/30 bg-destructive/10 text-destructive"
                            : "border-primary/20 bg-primary/10 text-primary"
                    )}
                >
                    <Clock className="h-4 w-4" />
                </div>
                <div>
                    <p className="text-[11px] font-semibold uppercase tracking-[0.22em] text-muted-foreground/75">
                        Session window
                    </p>
                    <p className="mt-1 text-sm font-semibold text-foreground">Expires in {timeLeft}</p>
                </div>
            </div>
            <span className="text-xs font-medium text-muted-foreground">Auto cleanup</span>
        </div>
    );
}