'use client';

import React, { useState, useEffect } from 'react';
import { CreditCard, Zap, Save, Check, ShieldCheck, QrCode } from 'lucide-react';
import { PaymentMethod } from '@/types';
import { INITIAL_PAYMENT_METHODS } from '@/lib/data-service';
import { formatCOP } from '@/lib/pricing-engine';

export default function AdminPaymentMethodsPage() {
  const [methods, setMethods] = useState<PaymentMethod[]>(INITIAL_PAYMENT_METHODS);
  const [message, setMessage] = useState<string | null>(null);

  useEffect(() => {
    fetch('/api/payment-methods')
      .then((r) => r.json())
      .then((d) => d.success && setMethods(d.paymentMethods))
      .catch(() => {});
  }, []);

  const handleToggleActive = async (method: PaymentMethod) => {
    const updated = { ...method, isActive: !method.isActive };
    setMethods((prev) => prev.map((m) => (m.id === method.id ? updated : m)));

    await fetch('/api/payment-methods', {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ id: method.id, updates: { isActive: updated.isActive } }),
    });
    setMessage(`Método "${method.name}" ${updated.isActive ? 'activado' : 'desactivado'}.`);
  };

  const handleUpdateField = (id: string, field: keyof PaymentMethod, val: any) => {
    setMethods((prev) =>
      prev.map((m) => (m.id === id ? { ...m, [field]: val } : m))
    );
  };

  const handleSaveMethod = async (method: PaymentMethod) => {
    await fetch('/api/payment-methods', {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ id: method.id, updates: method }),
    });
    setMessage(`✅ Cambios guardados para "${method.name}".`);
  };

  return (
    <div className="space-y-6">
      {/* Header */}
      <div>
        <h1 className="text-2xl font-black text-white flex items-center gap-2">
          <CreditCard className="w-6 h-6 text-purple-400" />
          <span>Configuración de Medios de Pago & Anticipos</span>
        </h1>
        <p className="text-xs text-neutral-400 mt-1">
          Habilita métodos de pago, configura el valor de separación de $10.000 COP y personaliza los datos de Nequi / Daviplata.
        </p>
      </div>

      {message && (
        <div className="bg-emerald-950/80 border border-emerald-800 text-emerald-300 px-4 py-3 rounded-2xl text-xs flex items-center justify-between">
          <span>{message}</span>
          <button onClick={() => setMessage(null)} className="font-bold text-white cursor-pointer">
            ✕
          </button>
        </div>
      )}

      {/* Methods Cards */}
      <div className="space-y-4">
        {methods.map((method) => (
          <div
            key={method.id}
            className="bg-neutral-950 border border-neutral-800 rounded-3xl p-5 sm:p-6 space-y-4"
          >
            <div className="flex flex-col sm:flex-row sm:items-center justify-between gap-3 border-b border-neutral-800/80 pb-4">
              <div className="flex items-center space-x-3">
                <div className="w-10 h-10 rounded-xl bg-neutral-900 border border-neutral-800 text-purple-400 flex items-center justify-center font-bold">
                  {method.type === 'contraentrega' ? <Zap className="w-5 h-5 fill-purple-400" /> : <CreditCard className="w-5 h-5" />}
                </div>
                <div>
                  <h3 className="font-bold text-white text-base">{method.name}</h3>
                  <span className="text-xs text-neutral-500 font-mono">Tipo: {method.type}</span>
                </div>
              </div>

              <div className="flex items-center space-x-2">
                <button
                  onClick={() => handleToggleActive(method)}
                  className={`text-xs font-bold px-3 py-1.5 rounded-xl transition-all cursor-pointer ${
                    method.isActive
                      ? 'bg-emerald-500/20 text-emerald-400 hover:bg-emerald-500/30'
                      : 'bg-neutral-800 text-neutral-500 hover:bg-neutral-700'
                  }`}
                >
                  {method.isActive ? 'Habilitado en Tienda' : 'Deshabilitado'}
                </button>
              </div>
            </div>

            <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
              <div>
                <label className="block text-[11px] font-bold text-neutral-400 mb-1">Nombre Visible:</label>
                <input
                  type="text"
                  value={method.name}
                  onChange={(e) => handleUpdateField(method.id, 'name', e.target.value)}
                  className="w-full bg-neutral-900 border border-neutral-800 rounded-xl px-3 py-2 text-xs text-white outline-hidden"
                />
              </div>

              <div>
                <label className="block text-[11px] font-bold text-neutral-400 mb-1">Descripción para el Cliente:</label>
                <input
                  type="text"
                  value={method.description}
                  onChange={(e) => handleUpdateField(method.id, 'description', e.target.value)}
                  className="w-full bg-neutral-900 border border-neutral-800 rounded-xl px-3 py-2 text-xs text-white outline-hidden"
                />
              </div>

              {method.requiresDeposit && (
                <div>
                  <label className="block text-[11px] font-bold text-amber-400 mb-1">Valor de la Separación (COP):</label>
                  <input
                    type="number"
                    value={method.depositAmount}
                    onChange={(e) => handleUpdateField(method.id, 'depositAmount', parseInt(e.target.value, 10) || 0)}
                    className="w-full bg-neutral-900 border border-neutral-800 rounded-xl px-3 py-2 text-xs text-white outline-hidden font-bold"
                  />
                  <span className="text-[10px] text-neutral-400 mt-1 block">
                    (El saldo restante se cobra contraentrega al recibir)
                  </span>
                </div>
              )}

              <div>
                <label className="block text-[11px] font-bold text-neutral-400 mb-1">Cuentas / Números de Pago (Nequi / Daviplata):</label>
                <input
                  type="text"
                  value={method.accountInfo || ''}
                  onChange={(e) => handleUpdateField(method.id, 'accountInfo', e.target.value)}
                  className="w-full bg-neutral-900 border border-neutral-800 rounded-xl px-3 py-2 text-xs text-white outline-hidden"
                  placeholder="Ej: Nequi / Daviplata: 3XX XXX XXXX"
                />
              </div>

            </div>

            <div className="flex justify-end pt-2">
              <button
                onClick={() => handleSaveMethod(method)}
                className="bg-purple-600 hover:bg-purple-700 text-white font-bold text-xs px-4 py-2 rounded-xl flex items-center space-x-1.5 transition-all cursor-pointer shadow-lg shadow-purple-600/30"
              >
                <Save className="w-3.5 h-3.5" />
                <span>Guardar Configuración</span>
              </button>
            </div>
          </div>
        ))}
      </div>
    </div>
  );
}