"use client";

import { useState } from "react";
import { Button } from "./Button";
import { Field } from "./Field";

const UUID_RE = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;

export function RelinkPanel({ used, max, onRelink, error }: { instanceId: string; used: number; max: number; onRelink: (newId: string) => void; error?: string }) {
    const [open, setOpen] = useState(false);
    const [value, setValue] = useState("");
    const remaining = Math.max(0, max - used);
    const exhausted = remaining === 0;

    return (
        <section className="grid gap-3 border-t border-rule-soft pt-5">
            <h2 className="text-xl">Moved to a new server?</h2>
            <p className="text-[0.82rem] text-ink-2">Relinking issues a replacement licence for the new install, covering the rest of your current term.</p>
            {open && !exhausted && <Field label="New instance ID" value={value} onChange={(e) => setValue(e.target.value)} error={error} hint="From Settings → Licence on the new install." />}
            <div className="flex flex-wrap items-center gap-3">
                <Button type="button" variant="line" disabled={exhausted || (open && !UUID_RE.test(value.trim()))} onClick={() => (open ? onRelink(value.trim()) : setOpen(true))}>
                    Relink to a new install
                </Button>
                <span className="text-[0.82rem] text-ink-3">
                    {exhausted ? "You have used every relink for this term contact support and we will sort it out." : `${remaining} of ${max} relinks left this term`}
                </span>
            </div>
        </section>
    );
}
