"use client";

// Anti-spam quick-check shown as a popup ON TOP of a lead form (via the
// LeadModalShell `overlay` slot) so it can't be scrolled past or missed.
// Generates a fresh sum each time it mounts; calls onVerified once the correct
// answer is confirmed, onCancel to dismiss back to the form.

import { useEffect, useState } from "react";
import { toast } from "sonner";

import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";

export function CaptchaChallenge({
  onVerified,
  onCancel,
}: {
  onVerified: () => void;
  onCancel: () => void;
}) {
  const [a, setA] = useState(0);
  const [b, setB] = useState(0);
  const [answer, setAnswer] = useState("");

  // Fresh challenge whenever this mounts (the parent mounts it on demand).
  // Math.random is allowed in the browser runtime (not a workflow script).
  const regenerate = () => {
    setA(Math.floor(Math.random() * 8) + 1);
    setB(Math.floor(Math.random() * 8) + 1);
    setAnswer("");
  };
  useEffect(() => {
    regenerate();
  }, []);

  const confirm = () => {
    if (answer.trim() !== "" && parseInt(answer, 10) === a + b) {
      onVerified();
    } else {
      toast.error("That's not quite right - try again.");
      regenerate();
    }
  };

  return (
    <div className="w-full max-w-xs space-y-4 rounded-xl border border-border/60 bg-card p-5 shadow-xl">
      <div className="space-y-1">
        <p className="text-sm font-semibold">Quick check</p>
        <p className="text-xs text-muted-foreground">Confirm you&apos;re human before we send this.</p>
      </div>
      <div className="space-y-1.5">
        <Label htmlFor="captcha-answer">
          What is {a} + {b}?
        </Label>
        <Input
          id="captcha-answer"
          inputMode="numeric"
          autoFocus
          value={answer}
          onChange={(e) => setAnswer(e.target.value)}
          onKeyDown={(e) => {
            if (e.key === "Enter") confirm();
          }}
          placeholder="Answer"
        />
      </div>
      <div className="flex justify-end gap-2">
        <Button type="button" variant="ghost" onClick={onCancel}>
          Cancel
        </Button>
        <Button
          type="button"
          onClick={confirm}
          className="bg-cta text-cta-foreground shadow-xs hover:bg-cta/90 focus-visible:ring-cta/50"
        >
          Confirm &amp; submit
        </Button>
      </div>
    </div>
  );
}