"use client";

import { Stamp } from "lucide-react";
import { useRouter } from "next/navigation";
import { useState, useTransition } from "react";
import { Button } from "@/components/ui/button";
import { Modal } from "@/components/ui/modal";
import { Input } from "@/components/ui/input";
import { cn } from "@/lib/utils/cn";
import { addLoyaltyStampAction } from "../actions/loyalty-actions";

export function AddStampButton({
  customerId,
  appointmentId,
  className,
  size = "sm",
}: {
  customerId: string;
  appointmentId?: string;
  className?: string;
  size?: "sm" | "md" | "lg";
}) {
  const router = useRouter();
  const [open, setOpen] = useState(false);
  const [amount, setAmount] = useState("1");
  const [reason, setReason] = useState("");
  const [error, setError] = useState<string | null>(null);
  const [result, setResult] = useState<{ rewardCreated?: boolean } | null>(null);
  const [isPending, startTransition] = useTransition();

  const close = () => {
    const shouldRefresh = !!result;
    setOpen(false);
    setResult(null);
    setError(null);
    setAmount("1");
    setReason("");
    if (shouldRefresh) router.refresh();
  };

  const submit = () => {
    const parsed = Number(amount);
    if (!Number.isInteger(parsed) || parsed <= 0) {
      setError("Enter a positive number of stamps.");
      return;
    }
    setError(null);
    startTransition(async () => {
      const res = await addLoyaltyStampAction({
        customerId,
        amount: parsed,
        appointmentId,
        reason: reason || undefined,
      });
      if (!res.success) {
        setError(res.error ?? "Couldn't add a stamp.");
        return;
      }
      setResult({ rewardCreated: res.rewardCreated });
    });
  };

  return (
    <>
      <Button
        variant="secondary"
        size={size}
        className={cn("shrink-0", className)}
        onClick={() => setOpen(true)}
      >
        <Stamp className="h-4 w-4" aria-hidden="true" />
        Add Loyalty Stamp
      </Button>
      <Modal open={open} onClose={close} title={result ? "Stamp Added" : "Add Loyalty Stamp"}>
        {result ? (
          <div className="space-y-4">
            <p role="status" className="text-muted text-sm">
              The stamp has been recorded on this customer&apos;s loyalty account.
            </p>
            {result.rewardCreated && (
              <p className="border-accent-loyalty/30 bg-accent-loyalty/10 rounded-lg border p-3 text-xs font-medium">
                They&apos;ve now reached the stamp threshold — a reward is available.
              </p>
            )}
            <Button className="w-full" onClick={close}>
              Done
            </Button>
          </div>
        ) : (
          <div className="space-y-4">
            <Input
              label="Stamps to add"
              type="number"
              min={1}
              value={amount}
              onChange={(e) => setAmount(e.target.value)}
            />
            <Input
              label="Reason (optional)"
              placeholder="e.g. Referral bonus"
              value={reason}
              onChange={(e) => setReason(e.target.value)}
            />
            {error && (
              <p role="alert" className="text-danger text-sm font-medium">
                {error}
              </p>
            )}
            <Button className="w-full" isLoading={isPending} onClick={submit}>
              Add Stamp
            </Button>
          </div>
        )}
      </Modal>
    </>
  );
}