import { useMutation } from "@tanstack/react-query";
import { useState } from "react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import {
	formatCents,
	TOPUP_MAX_CENTS,
	TOPUP_MIN_CENTS,
	TOPUP_PRESETS_CENTS,
} from "@/lib/drinkkaart";
import { orpc } from "@/utils/orpc";

interface TopUpModalProps {
	onClose: () => void;
}

export function TopUpModal({ onClose }: TopUpModalProps) {
	const [selectedCents, setSelectedCents] = useState<number>(1000);
	const [customEuros, setCustomEuros] = useState("");
	const [useCustom, setUseCustom] = useState(false);

	const checkoutMutation = useMutation({
		...orpc.drinkkaart.getTopUpCheckoutUrl.mutationOptions(),
		onSuccess: (data: { checkoutUrl: string }) => {
			window.location.href = data.checkoutUrl;
		},
		onError: (err: Error) => {
			console.error("Checkout error:", err);
		},
	});

	const amountCents = useCustom
		? Math.round((Number.parseFloat(customEuros || "0") || 0) * 100)
		: selectedCents;

	const isValidAmount =
		Number.isInteger(amountCents) &&
		amountCents >= TOPUP_MIN_CENTS &&
		amountCents <= TOPUP_MAX_CENTS;

	const handleSubmit = () => {
		if (!isValidAmount) return;
		checkoutMutation.mutate({ amountCents });
	};

	return (
		<div className="fixed inset-0 z-50 flex items-end justify-center sm:items-center">
			<button
				type="button"
				className="absolute inset-0 bg-black/60"
				aria-label="Sluiten"
				onClick={onClose}
			/>
			<div className="relative z-10 w-full max-w-sm rounded-t-2xl bg-[#1a3d40] p-6 sm:rounded-2xl">
				<div className="mb-5 flex items-center justify-between">
					<h2 className="font-['Intro',sans-serif] text-white text-xl">
						Drinkkaart opladen
					</h2>
					<button
						type="button"
						onClick={onClose}
						className="text-white/50 hover:text-white"
						aria-label="Sluiten"
					>
						✕
					</button>
				</div>

				{/* Preset amounts */}
				<div className="mb-4 grid grid-cols-4 gap-2">
					{TOPUP_PRESETS_CENTS.map((cents) => (
						<button
							key={cents}
							type="button"
							onClick={() => {
								setSelectedCents(cents);
								setUseCustom(false);
							}}
							className={`rounded-lg border py-3 font-medium text-sm transition-colors ${
								!useCustom && selectedCents === cents
									? "border-white bg-white text-[#214e51]"
									: "border-white/20 text-white hover:border-white/50"
							}`}
						>
							{formatCents(cents)}
						</button>
					))}
				</div>

				{/* Custom amount */}
				<div className="mb-5">
					<label
						htmlFor="custom-amount"
						className="mb-2 block text-sm text-white/60"
					>
						Eigen bedrag (€ 1 – € 500)
					</label>
					<div className="relative">
						<span className="absolute top-1/2 left-3 -translate-y-1/2 text-white/50">
							€
						</span>
						<Input
							id="custom-amount"
							type="number"
							min="1"
							max="500"
							step="0.50"
							placeholder="Bijv. 15"
							value={customEuros}
							onChange={(e) => {
								setCustomEuros(e.target.value);
								setUseCustom(true);
							}}
							className="border-white/20 bg-white/10 pl-8 text-white placeholder:text-white/30"
						/>
					</div>
					{useCustom && !isValidAmount && customEuros !== "" && (
						<p className="mt-1 text-red-400 text-sm">
							Bedrag moet tussen {formatCents(TOPUP_MIN_CENTS)} en{" "}
							{formatCents(TOPUP_MAX_CENTS)} liggen
						</p>
					)}
				</div>

				<div className="mb-3 rounded-lg bg-white/5 px-4 py-3">
					<span className="text-sm text-white/60">Te betalen: </span>
					<span className="font-semibold text-white">
						{isValidAmount ? formatCents(amountCents) : "—"}
					</span>
				</div>

				<Button
					onClick={handleSubmit}
					disabled={!isValidAmount || checkoutMutation.isPending}
					className="w-full bg-white font-semibold text-[#214e51] hover:bg-white/90 disabled:opacity-50"
				>
					{checkoutMutation.isPending
						? "Doorsturen naar betaling..."
						: "Naar betaling"}
				</Button>
			</div>
		</div>
	);
}