import React, { useState, useEffect } from 'react';
import { useNavigate, Link } from 'react-router-dom';
import { PublicLayout } from '../../components/layout';
import { Button } from '../../components/ui';
import { getDemoAccounts, createDemoSession, DemoAccount } from '../../api/services/demo';
import { apiClient } from '../../api/client';
import { Check, Clock, Shield, Play, Zap, ArrowRight, Store, Factory } from 'lucide-react';
import { markTourAsStartPending } from '../../features/demo-onboarding';

export const DemoPage: React.FC = () => {
  const navigate = useNavigate();
  const [demoAccounts, setDemoAccounts] = useState<DemoAccount[]>([]);
  const [loading, setLoading] = useState(true);
  const [creatingSession, setCreatingSession] = useState(false);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    const fetchDemoAccounts = async () => {
      try {
        const accounts = await getDemoAccounts();
        setDemoAccounts(accounts);
      } catch (err) {
        setError('Error al cargar las cuentas demo');
        console.error('Error fetching demo accounts:', err);
      } finally {
        setLoading(false);
      }
    };

    fetchDemoAccounts();
  }, []);

  const handleStartDemo = async (accountType: string) => {
    setCreatingSession(true);
    setError(null);

    try {
      const session = await createDemoSession({
        demo_account_type: accountType as 'individual_bakery' | 'central_baker',
      });

      console.log('✅ Demo session created:', session);

      // Store session ID in API client
      apiClient.setDemoSessionId(session.session_id);

      // **CRITICAL FIX: Set the virtual tenant ID in API client**
      // This ensures all API requests include the correct tenant context
      apiClient.setTenantId(session.virtual_tenant_id);
      console.log('✅ Set API client tenant ID:', session.virtual_tenant_id);

      // Store session info in localStorage for UI
      localStorage.setItem('demo_mode', 'true');
      localStorage.setItem('demo_session_id', session.session_id);
      localStorage.setItem('demo_account_type', accountType);
      localStorage.setItem('demo_expires_at', session.expires_at);
      localStorage.setItem('demo_tenant_id', session.virtual_tenant_id);

      // **CRITICAL FIX: Initialize tenant store with demo tenant**
      // This ensures useTenantId() returns the correct virtual tenant ID
      const { useTenantStore } = await import('../../stores/tenant.store');
      const demoTenant = {
        id: session.virtual_tenant_id,
        name: session.demo_config?.name || `Demo ${accountType}`,
        business_type: accountType === 'individual_bakery' ? 'bakery' : 'central_baker',
        business_model: accountType,
        address: session.demo_config?.address || 'Demo Address',
        city: session.demo_config?.city || 'Madrid',
        postal_code: '28001',
        phone: null,
        is_active: true,
        subscription_tier: 'demo',
        ml_model_trained: false,
        last_training_date: null,
        owner_id: 'demo-user',
        created_at: new Date().toISOString(),
      };

      useTenantStore.getState().setCurrentTenant(demoTenant);
      console.log('✅ Initialized tenant store with demo tenant:', demoTenant);

      // Mark tour to start automatically
      markTourAsStartPending();

      // Navigate to setup page to wait for data cloning
      navigate(`/demo/setup?session=${session.session_id}`);
    } catch (err: any) {
      setError(err?.message || 'Error al crear sesión demo');
      console.error('Error creating demo session:', err);
    } finally {
      setCreatingSession(false);
    }
  };

  const getAccountIcon = (accountType: string) => {
    return accountType === 'individual_bakery' ? Store : Factory;
  };

  if (loading) {
    return (
      <PublicLayout
        variant="full-width"
        contentPadding="none"
        headerProps={{
          showThemeToggle: true,
          showAuthButtons: true,
          showLanguageSelector: true,
        }}
      >
        <div className="min-h-screen flex items-center justify-center bg-gradient-to-br from-[var(--bg-primary)] via-[var(--bg-secondary)] to-[var(--color-primary)]/5">
          <div className="text-center">
            <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-[var(--color-primary)] mx-auto"></div>
            <p className="mt-4 text-[var(--text-secondary)]">Cargando cuentas demo...</p>
          </div>
        </div>
      </PublicLayout>
    );
  }

  return (
    <PublicLayout
      variant="full-width"
      contentPadding="none"
      headerProps={{
        showThemeToggle: true,
        showAuthButtons: true,
        showLanguageSelector: true,
      }}
    >
      {/* Hero Section */}
      <section className="relative py-20 lg:py-32 bg-gradient-to-br from-[var(--bg-primary)] via-[var(--bg-secondary)] to-[var(--color-primary)]/5">
        <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
          <div className="text-center mb-16">
            <div className="mb-6">
              <span className="inline-flex items-center px-3 py-1 rounded-full text-sm font-medium bg-[var(--color-primary)]/10 text-[var(--color-primary)]">
                <Play className="w-4 h-4 mr-2" />
                Demo Interactiva
              </span>
            </div>

            <h1 className="text-4xl tracking-tight font-extrabold text-[var(--text-primary)] sm:text-5xl lg:text-6xl">
              <span className="block">Prueba BakeryIA</span>
              <span className="block text-[var(--color-primary)]">sin compromiso</span>
            </h1>

            <p className="mt-6 max-w-3xl mx-auto text-lg text-[var(--text-secondary)] sm:text-xl">
              Explora nuestro sistema con datos reales de panaderías españolas.
              Elige el tipo de negocio que mejor se adapte a tu caso.
            </p>

            <div className="mt-8 flex items-center justify-center space-x-6 text-sm text-[var(--text-tertiary)]">
              <div className="flex items-center">
                <Check className="w-4 h-4 text-green-500 mr-2" />
                Sin tarjeta de crédito
              </div>
              <div className="flex items-center">
                <Clock className="w-4 h-4 text-green-500 mr-2" />
                30 minutos de acceso
              </div>
              <div className="flex items-center">
                <Shield className="w-4 h-4 text-green-500 mr-2" />
                Datos aislados y seguros
              </div>
            </div>
          </div>

          {error && (
            <div className="mb-8 bg-red-50 dark:bg-red-900/20 border border-red-200 dark:border-red-800 text-red-700 dark:text-red-400 px-4 py-3 rounded-lg max-w-2xl mx-auto">
              {error}
            </div>
          )}

          {/* Demo Account Cards */}
          <div className="grid md:grid-cols-2 gap-8 max-w-6xl mx-auto">
            {demoAccounts.map((account) => {
              const Icon = getAccountIcon(account.account_type);

              return (
                <div
                  key={account.account_type}
                  className="relative bg-[var(--bg-primary)] rounded-2xl shadow-xl hover:shadow-2xl transition-all duration-300 overflow-hidden border border-[var(--border-default)] group"
                >
                  {/* Gradient overlay */}
                  <div className="absolute inset-0 bg-gradient-to-br from-[var(--color-primary)]/5 to-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-300"></div>

                  <div className="relative p-8">
                    {/* Header */}
                    <div className="flex items-start justify-between mb-6">
                      <div className="flex items-center">
                        <div className="p-3 rounded-xl bg-[var(--color-primary)]/10 text-[var(--color-primary)]">
                          <Icon className="w-6 h-6" />
                        </div>
                        <div className="ml-4">
                          <h2 className="text-2xl font-bold text-[var(--text-primary)]">
                            {account.name}
                          </h2>
                          <p className="text-sm text-[var(--text-tertiary)] mt-1">
                            {account.business_model}
                          </p>
                        </div>
                      </div>
                      <span className="px-3 py-1 bg-[var(--color-primary)]/10 text-[var(--color-primary)] rounded-full text-xs font-semibold">
                        DEMO
                      </span>
                    </div>

                    {/* Description */}
                    <p className="text-[var(--text-secondary)] mb-6">
                      {account.description}
                    </p>

                    {/* Features */}
                    {account.features && account.features.length > 0 && (
                      <div className="mb-6 space-y-2">
                        <p className="text-sm font-semibold text-[var(--text-primary)] mb-3">
                          Funcionalidades incluidas:
                        </p>
                        {account.features.map((feature, idx) => (
                          <div key={idx} className="flex items-center text-sm text-[var(--text-secondary)]">
                            <Zap className="w-4 h-4 mr-2 text-[var(--color-primary)]" />
                            {feature}
                          </div>
                        ))}
                      </div>
                    )}

                    {/* Demo Benefits */}
                    <div className="space-y-2 mb-8 pt-6 border-t border-[var(--border-default)]">
                      <div className="flex items-center text-sm text-[var(--text-secondary)]">
                        <Check className="w-4 h-4 mr-2 text-green-500" />
                        Datos reales en español
                      </div>
                      <div className="flex items-center text-sm text-[var(--text-secondary)]">
                        <Check className="w-4 h-4 mr-2 text-green-500" />
                        Sesión aislada de 30 minutos
                      </div>
                      <div className="flex items-center text-sm text-[var(--text-secondary)]">
                        <Check className="w-4 h-4 mr-2 text-green-500" />
                        Sin necesidad de registro
                      </div>
                    </div>

                    {/* CTA Button */}
                    <Button
                      onClick={() => handleStartDemo(account.account_type)}
                      disabled={creatingSession}
                      size="lg"
                      className="w-full bg-[var(--color-primary)] hover:bg-[var(--color-primary-dark)] text-white shadow-lg hover:shadow-xl transform hover:scale-105 transition-all duration-200"
                    >
                      {creatingSession ? (
                        <span className="flex items-center justify-center">
                          <svg className="animate-spin -ml-1 mr-3 h-5 w-5 text-white" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24">
                            <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4"></circle>
                            <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
                          </svg>
                          Creando sesión...
                        </span>
                      ) : (
                        <>
                          <Play className="mr-2 w-5 h-5" />
                          Probar Demo Ahora
                        </>
                      )}
                    </Button>
                  </div>
                </div>
              );
            })}
          </div>

          {/* Footer CTA */}
          <div className="mt-16 text-center">
            <p className="text-[var(--text-secondary)] mb-4">
              ¿Ya tienes una cuenta?
            </p>
            <Link
              to="/login"
              className="inline-flex items-center text-[var(--color-primary)] hover:text-[var(--color-primary-dark)] font-semibold transition-colors"
            >
              Inicia sesión aquí
              <ArrowRight className="ml-2 w-4 h-4" />
            </Link>
          </div>
        </div>
      </section>
    </PublicLayout>
  );
};

export default DemoPage;