'use client';

import React, { useState } from 'react';
import Link from 'next/link';
import { INITIAL_OBRAS } from '@/lib/data/mockData';
import { Building2, MapPin, Calendar, ArrowRight, ShieldCheck, Search, HardHat, CheckCircle2 } from 'lucide-react';

export default function HomePage() {
  const [busqueda, setBusqueda] = useState('');
  const [obras] = useState(INITIAL_OBRAS);

  const obrasFiltradas = obras.filter(o => 
    o.nombre.toLowerCase().includes(busqueda.toLowerCase()) ||
    o.comuna.toLowerCase().includes(busqueda.toLowerCase()) ||
    o.direccion.toLowerCase().includes(busqueda.toLowerCase())
  );

  return (
    <div className="min-h-screen bg-slate-950 text-slate-100 flex flex-col justify-between selection:bg-sky-500 selection:text-white">
      {/* Header Público con acceso discreto de Admin */}
      <header className="border-b border-slate-800 bg-slate-900/80 backdrop-blur-md sticky top-0 z-50">
        <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 h-20 flex items-center justify-between">
          <div className="flex items-center space-x-3">
            <div className="p-2.5 bg-gradient-to-tr from-sky-600 to-amber-500 rounded-xl shadow-lg shadow-sky-500/20">
              <Building2 className="w-7 h-7 text-white" />
            </div>
            <div>
              <span className="text-2xl font-bold tracking-tight font-sans">
                sigue<span className="text-sky-400">obras</span><span className="text-amber-500">.cl</span>
              </span>
              <p className="text-xs text-slate-400 font-medium">Plataforma de Seguimiento de Obras de Construcción</p>
            </div>
          </div>

          {/* Botón discreto de acceso a administración (Punto 2.3 del Plan) */}
          <Link 
            href="/admin/login" 
            className="flex items-center space-x-2 px-3.5 py-2 rounded-lg text-xs font-semibold text-slate-400 hover:text-white hover:bg-slate-800 border border-slate-800 hover:border-slate-700 transition-all duration-200"
            title="Acceso reservado a Arquitecto / Administrador"
          >
            <ShieldCheck className="w-4 h-4 text-amber-500" />
            <span>Acceso Arquitecto / Admin</span>
          </Link>
        </div>
      </header>

      {/* Hero & Banner Informativo */}
      <main className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-12 flex-1 w-full">
        <div className="text-center max-w-3xl mx-auto mb-12">
          <div className="inline-flex items-center space-x-2 px-3.5 py-1.5 rounded-full bg-sky-950/80 border border-sky-800/60 text-sky-300 text-xs font-medium mb-4">
            <HardHat className="w-4 h-4 text-amber-400" />
            <span>Plataforma Multi-Rol por Obra</span>
          </div>
          <h1 className="text-4xl sm:text-5xl font-extrabold tracking-tight text-white mb-4 leading-tight">
            Selecciona tu <span className="gradient-text">Obra de Construcción</span>
          </h1>
          <p className="text-slate-400 text-base sm:text-lg">
            Elige el proyecto para ingresar con tu rol asignado (Propietarios, Constructores, ITO o Externo).
          </p>
        </div>

        {/* Buscador de Obras */}
        <div className="max-w-md mx-auto mb-10">
          <div className="relative">
            <Search className="w-5 h-5 absolute left-3.5 top-1/2 -translate-y-1/2 text-slate-500" />
            <input 
              type="text"
              placeholder="Buscar por nombre, comuna o dirección..."
              value={busqueda}
              onChange={(e) => setBusqueda(e.target.value)}
              className="w-full pl-11 pr-4 py-3 bg-slate-900/90 border border-slate-800 rounded-xl text-slate-100 placeholder-slate-500 focus:outline-none focus:ring-2 focus:ring-sky-500 focus:border-transparent transition-all shadow-inner text-sm"
            />
          </div>
        </div>

        {/* Grid de Obras Activas */}
        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-8">
          {obrasFiltradas.map((obra) => (
            <div 
              key={obra.id}
              className="glass-card rounded-2xl overflow-hidden flex flex-col justify-between group border border-slate-800 hover:border-sky-500/40"
            >
              <div>
                {/* Imagen de la Obra */}
                <div className="relative h-48 w-full overflow-hidden bg-slate-900">
                  <img 
                    src={obra.imagen} 
                    alt={obra.nombre}
                    className="w-full h-full object-cover group-hover:scale-105 transition-transform duration-500"
                  />
                  <div className="absolute inset-0 bg-gradient-to-t from-slate-950 via-slate-950/20 to-transparent" />
                  
                  {/* Badge Estado */}
                  <div className="absolute top-3 right-3">
                    <span className={`px-2.5 py-1 rounded-full text-xs font-semibold backdrop-blur-md shadow-md border ${
                      obra.estado === 'en_ejecucion' 
                        ? 'bg-emerald-950/80 text-emerald-300 border-emerald-700/50' 
                        : 'bg-amber-950/80 text-amber-300 border-amber-700/50'
                    }`}>
                      {obra.estado === 'en_ejecucion' ? 'En Ejecución' : 'Planificación'}
                    </span>
                  </div>

                  <div className="absolute bottom-3 left-3 right-3 flex items-center justify-between text-xs text-slate-300">
                    <div className="flex items-center space-x-1.5 bg-slate-900/80 backdrop-blur-md px-2.5 py-1 rounded-md border border-slate-700/50">
                      <MapPin className="w-3.5 h-3.5 text-sky-400" />
                      <span>{obra.comuna}, {obra.ciudad}</span>
                    </div>
                  </div>
                </div>

                {/* Info de la Obra */}
                <div className="p-6">
                  <h3 className="text-xl font-bold text-white group-hover:text-sky-400 transition-colors mb-2 line-clamp-1">
                    {obra.nombre}
                  </h3>
                  <p className="text-slate-400 text-xs flex items-center space-x-1 mb-4">
                    <span>{obra.direccion}</span>
                  </p>

                  {/* Barra de Avance */}
                  <div className="mb-5">
                    <div className="flex justify-between text-xs font-medium mb-1.5">
                      <span className="text-slate-400">Avance de Obra</span>
                      <span className="text-sky-400 font-bold">{obra.porcentajeAvance}%</span>
                    </div>
                    <div className="w-full bg-slate-800 rounded-full h-2 overflow-hidden">
                      <div 
                        className="bg-gradient-to-r from-sky-500 to-amber-500 h-2 rounded-full transition-all duration-1000" 
                        style={{ width: `${obra.porcentajeAvance}%` }}
                      />
                    </div>
                  </div>

                  <div className="grid grid-cols-2 gap-2 text-xs py-3 border-t border-b border-slate-800/80 mb-5 text-slate-400">
                    <div>
                      <span className="block text-slate-500 text-[10px]">INICIO</span>
                      <span className="font-medium text-slate-300">{obra.fechaInicio}</span>
                    </div>
                    <div>
                      <span className="block text-slate-500 text-[10px]">ENTREGA EST.</span>
                      <span className="font-medium text-slate-300">{obra.fechaFinEstimada}</span>
                    </div>
                  </div>
                </div>
              </div>

              {/* Botón de Entrada por Obra (Paso 1 del Flujo Obra -> Rol) */}
              <div className="px-6 pb-6 pt-0">
                <Link
                  href={`/obra/${obra.id}/login`}
                  className="w-full btn-primary flex items-center justify-center space-x-2 py-3 px-4 rounded-xl text-sm font-semibold group-hover:shadow-lg transition-all"
                >
                  <span>Ingresar a esta Obra</span>
                  <ArrowRight className="w-4 h-4 group-hover:translate-x-1 transition-transform" />
                </Link>
              </div>
            </div>
          ))}
        </div>

        {obrasFiltradas.length === 0 && (
          <div className="text-center py-16 bg-slate-900/50 rounded-2xl border border-slate-800">
            <Building2 className="w-12 h-12 text-slate-600 mx-auto mb-3" />
            <h3 className="text-lg font-semibold text-slate-300">No se encontraron obras</h3>
            <p className="text-slate-500 text-sm mt-1">Intenta ajustando el filtro de búsqueda.</p>
          </div>
        )}
      </main>

      {/* Footer Público */}
      <footer className="border-t border-slate-800 bg-slate-900/40 py-6 text-center text-xs text-slate-500">
        <div className="max-w-7xl mx-auto px-4 flex flex-col sm:flex-row justify-between items-center space-y-2 sm:space-y-0">
          <p>© 2026 sigueobras.cl — Todos los derechos reservados.</p>
          <div className="flex items-center space-x-4">
            <span className="text-slate-600">Sistema Multi-Rol Seguro</span>
            <Link href="/admin/login" className="text-slate-400 hover:text-amber-400 transition-colors">
              Panel de Administrador
            </Link>
          </div>
        </div>
      </footer>
    </div>
  );
}