"use client";

import { useState } from "react";
import { BadgePercent, Loader2, CheckCircle } from "lucide-react";

type Props = {
  initialPercent: number;
  initialEndAtIso: string;
};

/** ISO (UTC) → valor para <input type="datetime-local"> en hora local del navegador. */
function isoToLocalInput(iso: string): string {
  const d = new Date(iso);
  if (!iso || Number.isNaN(d.getTime())) return "";
  const pad = (n: number) => String(n).padStart(2, "0");
  return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())}T${pad(d.getHours())}:${pad(d.getMinutes())}`;
}

export default function AdminStickerDiscountSettings({ initialPercent, initialEndAtIso }: Props) {
  const [percent, setPercent] = useState(String(initialPercent));
  const [endAt, setEndAt] = useState(isoToLocalInput(initialEndAtIso));
  const [loading, setLoading] = useState(false);
  const [saved, setSaved] = useState(false);
  const [error, setError] = useState("");

  const endDate = endAt ? new Date(endAt) : null;
  const pct = parseInt(percent, 10) || 0;
  const active = pct > 0 && endDate !== null && endDate > new Date();

  const save = async (override?: { percent: string; endAt: string }) => {
    setLoading(true);
    setSaved(false);
    setError("");
    const p = override?.percent ?? percent;
    const e = override?.endAt ?? endAt;
    try {
      const res = await fetch("/api/admin/site-config", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          sticker_discount_percent: p,
          sticker_discount_end_at: e ? new Date(e).toISOString() : "",
        }),
      });
      if (!res.ok) {
        const data = await res.json().catch(() => ({}));
        setError(data.error || "No se pudo guardar el descuento");
        return;
      }
      setSaved(true);
      setTimeout(() => setSaved(false), 3000);
    } finally {
      setLoading(false);
    }
  };

  const disable = () => {
    setPercent("0");
    save({ percent: "0", endAt });
  };

  return (
    <div className="glass-panel rounded-2xl p-6 space-y-5 border border-[#7c3aed]/30">
      <div className="flex flex-col sm:flex-row sm:items-start sm:justify-between gap-3">
        <div>
          <div className="flex items-center gap-2 mb-1">
            <BadgePercent className="w-5 h-5 text-[#7c3aed]" />
            <h2 className="text-lg font-bold text-white">Descuento en stickers</h2>
          </div>
          <p className="text-sm text-gray-400 max-w-2xl">
            Se aplica a todos los packs de stickers (no al merch), en la tienda y en el cobro real.
            Al llegar la fecha de término vuelve solo al precio normal.
          </p>
        </div>
        <span
          className={`shrink-0 rounded-full px-3 py-1 text-xs font-bold border ${
            active
              ? "bg-green-500/20 text-green-400 border-green-500/40"
              : "bg-white/5 text-gray-400 border-white/10"
          }`}
        >
          {active ? `ACTIVO · ${pct}%` : "INACTIVO"}
        </span>
      </div>

      <div className="grid grid-cols-1 sm:grid-cols-2 gap-4">
        <div>
          <label className="block text-xs text-gray-500 mb-1">Porcentaje (0 = sin descuento, máx. 90)</label>
          <input
            type="number"
            min={0}
            max={90}
            value={percent}
            onChange={(e) => setPercent(e.target.value)}
            className="w-full bg-black/40 border border-white/10 rounded-lg px-3 py-2 text-white focus:outline-none focus:border-[#7c3aed]"
          />
        </div>
        <div>
          <label className="block text-xs text-gray-500 mb-1">Termina el</label>
          <input
            type="datetime-local"
            value={endAt}
            onChange={(e) => setEndAt(e.target.value)}
            className="w-full bg-black/40 border border-white/10 rounded-lg px-3 py-2 text-white focus:outline-none focus:border-[#7c3aed]"
          />
        </div>
      </div>

      <div className="flex items-center gap-3 flex-wrap">
        <button
          type="button"
          onClick={() => save()}
          disabled={loading}
          className="flex items-center gap-2 px-4 py-2.5 rounded-xl bg-[#7c3aed] text-white font-bold text-sm hover:opacity-90 disabled:opacity-50"
        >
          {loading ? <Loader2 className="w-4 h-4 animate-spin" /> : null}
          Guardar
        </button>
        <button
          type="button"
          onClick={disable}
          disabled={loading}
          className="px-4 py-2.5 rounded-xl border border-white/10 text-gray-300 text-sm hover:bg-white/10 disabled:opacity-50"
        >
          Desactivar ahora
        </button>
        {saved && (
          <span className="flex items-center gap-1.5 text-green-400 text-sm">
            <CheckCircle className="w-4 h-4" /> Guardado
          </span>
        )}
        {error && <span className="text-red-400 text-sm">{error}</span>}
      </div>
    </div>
  );
}