import React, { useState, useEffect } from 'react';
import { Bird, Menu, X } from 'lucide-react';
import { motion, AnimatePresence } from 'framer-motion';
import { Home } from './components/Home';
import { YachtSearch } from './components/YachtSearch';
import { TripCalculator } from './components/TripCalculator';
import { HowItWorks } from './components/HowItWorks';
import { About } from './components/About';
import { Contact } from './components/Contact';
import { OffsetOrder } from './components/OffsetOrder';
import { getVesselData } from './api/aisClient';
import { calculateTripCarbon } from './utils/carbonCalculator';
import { analytics } from './utils/analytics';
import type { VesselData, CarbonCalculation, CalculatorType } from './types';

const sampleVessel: VesselData = {
  imo: "1234567",
  vesselName: "Sample Yacht",
  type: "Yacht",
  length: 50,
  width: 9,
  estimatedEnginePower: 2250
};

function App() {
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [vesselData, setVesselData] = useState<VesselData | null>(null);
  const [currentPage, setCurrentPage] = useState<'home' | 'calculator' | 'how-it-works' | 'about' | 'contact'>('home');
  const [showOffsetOrder, setShowOffsetOrder] = useState(false);
  const [offsetTons, setOffsetTons] = useState(0);
  const [monetaryAmount, setMonetaryAmount] = useState<number | undefined>();
  const [calculatorType, setCalculatorType] = useState<CalculatorType>('trip');
  const [mobileMenuOpen, setMobileMenuOpen] = useState(false);

  useEffect(() => {
    analytics.pageView(window.location.pathname);
  }, [currentPage]);

  const handleSearch = async (imo: string) => {
    setLoading(true);
    setError(null);
    setVesselData(null);
    
    try {
      const vessel = await getVesselData(imo);
      setVesselData(vessel);
    } catch (err) {
      setError('Unable to fetch vessel data. Please verify the IMO number and try again.');
    } finally {
      setLoading(false);
    }
  };

  const handleOffsetClick = (tons: number, monetaryAmount?: number) => {
    setOffsetTons(tons);
    setMonetaryAmount(monetaryAmount);
    setShowOffsetOrder(true);
    window.scrollTo({ top: 0, behavior: 'smooth' });
  };

  const handleNavigate = (page: 'home' | 'calculator' | 'how-it-works' | 'about' | 'contact') => {
    setCurrentPage(page);
    setMobileMenuOpen(false);
    window.scrollTo({ top: 0, behavior: 'smooth' });
  };

  const renderPage = () => {
    if (currentPage === 'calculator' && showOffsetOrder) {
      return (
        <div className="flex justify-center px-4 sm:px-0">
          <OffsetOrder
            tons={offsetTons}
            monetaryAmount={monetaryAmount}
            onBack={() => {
              setShowOffsetOrder(false);
              window.scrollTo({ top: 0, behavior: 'smooth' });
            }}
            calculatorType={calculatorType}
          />
        </div>
      );
    }

    switch (currentPage) {
      case 'calculator':
        return (
          <div className="flex flex-col items-center px-4 sm:px-6">
            <div className="text-center mb-12 max-w-2xl">
              <h2 className="text-3xl sm:text-4xl font-bold text-gray-900 mb-4">
                Calculate & Offset Your Yacht's Carbon Footprint
              </h2>
              <p className="text-base sm:text-lg text-gray-600">
                Use the calculator below to estimate your carbon footprint and explore offsetting options through our verified projects.
              </p>
            </div>

            <div className="flex flex-col items-center w-full max-w-2xl space-y-8">
              <TripCalculator 
                vesselData={sampleVessel}
                onOffsetClick={handleOffsetClick}
              />
            </div>
          </div>
        );
      case 'how-it-works':
        return <HowItWorks onNavigate={handleNavigate} />;
      case 'about':
        return <About onNavigate={handleNavigate} />;
      case 'contact':
        return <Contact />;
      default:
        return <Home onNavigate={handleNavigate} />;
    }
  };

  return (
    <div className="min-h-screen bg-gradient-to-b from-blue-50 to-green-50">
      <header className="bg-white shadow-sm relative">
        <div className="max-w-7xl mx-auto px-4 py-4 sm:px-6 lg:px-8">
          <div className="flex items-center justify-between">
            <div 
              className="flex items-center space-x-2 cursor-pointer" 
              onClick={() => handleNavigate('home')}
            >
              <Bird className="text-blue-600" size={24} />
              <h1 className="text-xl font-bold text-gray-900">Puffin Offset</h1>
            </div>
            
            {/* Mobile menu button */}
            <button
              className="sm:hidden p-2 rounded-md text-gray-600 hover:text-gray-900"
              onClick={() => setMobileMenuOpen(!mobileMenuOpen)}
            >
              {mobileMenuOpen ? <X size={24} /> : <Menu size={24} />}
            </button>

            {/* Desktop navigation */}
            <nav className="hidden sm:flex space-x-4">
              <button 
                onClick={() => handleNavigate('calculator')}
                className={`text-gray-600 hover:text-gray-900 ${currentPage === 'calculator' ? 'font-semibold' : ''}`}
              >
                Calculator
              </button>
              <button 
                onClick={() => handleNavigate('how-it-works')}
                className={`text-gray-600 hover:text-gray-900 ${currentPage === 'how-it-works' ? 'font-semibold' : ''}`}
              >
                How it Works
              </button>
              <button 
                onClick={() => handleNavigate('about')}
                className={`text-gray-600 hover:text-gray-900 ${currentPage === 'about' ? 'font-semibold' : ''}`}
              >
                About
              </button>
              <button 
                onClick={() => handleNavigate('contact')}
                className={`text-gray-600 hover:text-gray-900 ${currentPage === 'contact' ? 'font-semibold' : ''}`}
              >
                Contact
              </button>
            </nav>
          </div>

          {/* Mobile navigation */}
          {mobileMenuOpen && (
            <nav className="sm:hidden mt-4 pb-2 space-y-2">
              <button 
                onClick={() => handleNavigate('calculator')}
                className={`block w-full text-left px-4 py-2 rounded-lg ${
                  currentPage === 'calculator' 
                    ? 'bg-blue-50 text-blue-600 font-semibold' 
                    : 'text-gray-600 hover:bg-gray-50'
                }`}
              >
                Calculator
              </button>
              <button 
                onClick={() => handleNavigate('how-it-works')}
                className={`block w-full text-left px-4 py-2 rounded-lg ${
                  currentPage === 'how-it-works' 
                    ? 'bg-blue-50 text-blue-600 font-semibold' 
                    : 'text-gray-600 hover:bg-gray-50'
                }`}
              >
                How it Works
              </button>
              <button 
                onClick={() => handleNavigate('about')}
                className={`block w-full text-left px-4 py-2 rounded-lg ${
                  currentPage === 'about' 
                    ? 'bg-blue-50 text-blue-600 font-semibold' 
                    : 'text-gray-600 hover:bg-gray-50'
                }`}
              >
                About
              </button>
              <button 
                onClick={() => handleNavigate('contact')}
                className={`block w-full text-left px-4 py-2 rounded-lg ${
                  currentPage === 'contact' 
                    ? 'bg-blue-50 text-blue-600 font-semibold' 
                    : 'text-gray-600 hover:bg-gray-50'
                }`}
              >
                Contact
              </button>
            </nav>
          )}
        </div>
      </header>

      <main className="max-w-7xl mx-auto py-8 sm:py-12 overflow-hidden">
        <AnimatePresence mode="wait">
          <motion.div
            key={currentPage + (showOffsetOrder ? '-offset' : '')}
            initial={{ opacity: 0, y: 20 }}
            animate={{ opacity: 1, y: 0 }}
            exit={{ opacity: 0, y: -20 }}
            transition={{ 
              duration: 0.4,
              ease: [0.25, 0.1, 0.25, 1.0] 
            }}
          >
            {renderPage()}
          </motion.div>
        </AnimatePresence>
      </main>

      <footer className="bg-white mt-16">
        <div className="max-w-7xl mx-auto px-4 py-8 sm:px-6 lg:px-8">
          <p className="text-center text-gray-500">
            Powered by Wren Carbon Offset Projects
          </p>
        </div>
      </footer>
    </div>
  );
}

export default App;
