import React, { useState, useEffect } from 'react';
import { Check, AlertCircle, ArrowLeft, Loader2, Globe2, TreePine, Waves, Factory, Wind } from 'lucide-react';
import { createOffsetOrder, getPortfolios } from '../api/wrenClient';
import type { CurrencyCode, OffsetOrder as OffsetOrderType, Portfolio, OffsetProject } from '../types';
import { currencies, formatCurrency, getCurrencyByCode } from '../utils/currencies';
import { config } from '../utils/config';
import { sendFormspreeEmail } from '../utils/email';

interface Props {
  tons: number;
  monetaryAmount?: number;
  onBack: () => void;
  calculatorType: 'trip' | 'annual';
}

interface ProjectTypeIconProps {
  project: OffsetProject;
}

const ProjectTypeIcon = ({ project }: ProjectTypeIconProps) => {
  // Safely check if project and type exist
  if (!project || !project.type) {
    return <Globe2 className="text-blue-500" />;
  }

  const type = project.type.toLowerCase();
  
  switch (type) {
    case 'direct air capture':
      return <Factory className="text-purple-500" />;
    case 'blue carbon':
      return <Waves className="text-blue-500" />;
    case 'renewable energy':
      return <Wind className="text-green-500" />;
    case 'forestry':
      return <TreePine className="text-green-500" />;
    default:
      return <Globe2 className="text-blue-500" />;
  }
};

export function OffsetOrder({ tons, monetaryAmount, onBack, calculatorType }: Props) {
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [success, setSuccess] = useState(false);
  const [order, setOrder] = useState<OffsetOrderType | null>(null);
  const [currency, setCurrency] = useState<CurrencyCode>('USD');
  const [portfolio, setPortfolio] = useState<Portfolio | null>(null);
  const [loadingPortfolio, setLoadingPortfolio] = useState(true);
  const [formData, setFormData] = useState({
    name: '',
    email: '',
    phone: '',
    company: '',
    message: `I would like to offset ${tons.toFixed(2)} tons of CO2 from my yacht's ${calculatorType} emissions.`
  });

  useEffect(() => {
    if (!config.wrenApiKey) {
      setError('Carbon offset service is currently unavailable. Please use our contact form to request offsetting.');
      setLoadingPortfolio(false);
      return;
    }
    fetchPortfolio();
  }, []);

  const fetchPortfolio = async () => {
    try {
      const allPortfolios = await getPortfolios();
      
      // Check if portfolios were returned
      if (!allPortfolios || allPortfolios.length === 0) {
        throw new Error('No portfolios available');
      }
      
      // Only get the puffin portfolio, no selection allowed
      const puffinPortfolio = allPortfolios.find(p => 
        p.name.toLowerCase().includes('puffin') || 
        p.name.toLowerCase().includes('maritime')
      );
      
      if (puffinPortfolio) {
        console.log('[OffsetOrder] Found Puffin portfolio with ID:', puffinPortfolio.id);
        setPortfolio(puffinPortfolio);
      } else {
        // Default to first portfolio if no puffin portfolio found
        console.log('[OffsetOrder] No Puffin portfolio found, using first available portfolio with ID:', allPortfolios[0].id);
        setPortfolio(allPortfolios[0]);
      }
    } catch (err) {
      setError('Failed to fetch portfolio information. Please try again.');
    } finally {
      setLoadingPortfolio(false);
    }
  };

  const handleOffsetOrder = async () => {
    if (!portfolio) return;
    
    setLoading(true);
    setError(null);
    
    try {
      const newOrder = await createOffsetOrder(portfolio.id, tons);
      setOrder(newOrder);
      setSuccess(true);
    } catch (err) {
      setError('Failed to create offset order. Please try again.');
    } finally {
      setLoading(false);
    }
  };

  const renderPortfolioPrice = (portfolio: Portfolio) => {
    try {
      // Get the price per ton from the portfolio
      const pricePerTon = portfolio.pricePerTon || 200; // Default to 200 if not set
      const targetCurrency = getCurrencyByCode(currency);
      return formatCurrency(pricePerTon, targetCurrency);
    } catch (err) {
      console.error('Error formatting portfolio price:', err);
      return formatCurrency(200, currencies.USD); // Default fallback
    }
  };

  // Calculate offset cost using the portfolio price
  const offsetCost = monetaryAmount || (portfolio ? tons * (portfolio.pricePerTon || 200) : 0);

  return (
    <div className="bg-white rounded-lg shadow-xl p-8 max-w-4xl w-full">
      <button
        onClick={onBack}
        className="flex items-center text-gray-600 hover:text-gray-900 mb-6"
      >
        <ArrowLeft className="mr-2" size={20} />
        Back to Calculator
      </button>

      <div className="text-center mb-8">
        <h2 className="text-3xl font-bold text-gray-900 mb-4">
          Offset Your Impact
        </h2>
        <p className="text-lg text-gray-600">
          You're about to offset {tons.toFixed(2)} tons of CO₂
        </p>
      </div>

      {error && !config.wrenApiKey ? (
        <div className="max-w-2xl mx-auto">
          <div className="bg-blue-50 border border-blue-200 rounded-lg p-6 mb-8">
            <h3 className="text-xl font-semibold text-blue-900 mb-4">
              Contact Us for Offsetting
            </h3>
            <p className="text-blue-700 mb-4">
              Our automated offsetting service is temporarily unavailable. Please fill out the form below and our team will help you offset your emissions.
            </p>
            <form onSubmit={async (e) => {
              e.preventDefault();
              setLoading(true);
              try {
                await sendFormspreeEmail(formData, 'offset');
                setSuccess(true);
              } catch (err) {
                setError('Failed to send request. Please try again.');
              } finally {
                setLoading(false);
              }
            }} className="space-y-6">
              <div>
                <label className="block text-sm font-medium text-gray-700 mb-1">
                  Name *
                </label>
                <input
                  type="text"
                  required
                  value={formData.name}
                  onChange={(e) => setFormData(prev => ({ ...prev, name: e.target.value }))}
                  className="w-full px-4 py-2 border rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
                />
              </div>
              <div>
                <label className="block text-sm font-medium text-gray-700 mb-1">
                  Email *
                </label>
                <input
                  type="email"
                  required
                  value={formData.email}
                  onChange={(e) => setFormData(prev => ({ ...prev, email: e.target.value }))}
                  className="w-full px-4 py-2 border rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
                />
              </div>
              <div>
                <label className="block text-sm font-medium text-gray-700 mb-1">
                  Phone
                </label>
                <input
                  type="tel"
                  value={formData.phone}
                  onChange={(e) => setFormData(prev => ({ ...prev, phone: e.target.value }))}
                  className="w-full px-4 py-2 border rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
                />
              </div>
              <div>
                <label className="block text-sm font-medium text-gray-700 mb-1">
                  Company
                </label>
                <input
                  type="text"
                  value={formData.company}
                  onChange={(e) => setFormData(prev => ({ ...prev, company: e.target.value }))}
                  className="w-full px-4 py-2 border rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
                />
              </div>
              <div>
                <label className="block text-sm font-medium text-gray-700 mb-1">
                  Message
                </label>
                <textarea
                  rows={4}
                  value={formData.message}
                  onChange={(e) => setFormData(prev => ({ ...prev, message: e.target.value }))}
                  className="w-full px-4 py-2 border rounded-lg focus:ring-2 focus:ring-blue-500 focus:border-blue-500"
                />
              </div>
              <button
                type="submit"
                disabled={loading}
                className={`w-full flex items-center justify-center bg-blue-500 text-white py-3 rounded-lg transition-colors ${
                  loading ? 'opacity-50 cursor-not-allowed' : 'hover:bg-blue-600'
                }`}
              >
                {loading ? (
                  <>
                    <Loader2 className="animate-spin mr-2" size={20} />
                    Sending Request...
                  </>
                ) : (
                  'Send Offset Request'
                )}
              </button>
            </form>
          </div>
        </div>
      ) : error ? (
        <div className="bg-red-50 border border-red-200 rounded-lg p-4 mb-6">
          <div className="flex items-center space-x-2">
            <AlertCircle className="text-red-500" size={20} />
            <p className="text-red-700">{error}</p>
          </div>
        </div>
      ) : success && order ? (
        <div className="text-center py-8">
          <div className="inline-flex items-center justify-center w-16 h-16 bg-green-100 rounded-full mb-6">
            <Check className="text-green-500" size={32} />
          </div>
          <h3 className="text-2xl font-bold text-gray-900 mb-4">
            Offset Order Successful!
          </h3>
          <p className="text-gray-600 mb-6">
            Your order has been processed successfully. You'll receive a confirmation email shortly.
          </p>
          <div className="bg-gray-50 rounded-lg p-6 mb-6">
            <h4 className="text-lg font-semibold text-gray-900 mb-4">Order Summary</h4>
            <div className="space-y-2">
              <div className="flex justify-between">
                <span className="text-gray-600">Order ID:</span>
                <span className="font-medium">{order.id}</span>
              </div>
              <div className="flex justify-between">
                <span className="text-gray-600">Amount:</span>
                <span className="font-medium">
                  {formatCurrency(order.amountCharged / 100, currencies[order.currency])}
                </span>
              </div>
              <div className="flex justify-between">
                <span className="text-gray-600">CO₂ Offset:</span>
                <span className="font-medium">{order.tons} tons</span>
              </div>
              <div className="flex justify-between">
                <span className="text-gray-600">Portfolio:</span>
                <span className="font-medium">{order.portfolio.name}</span>
              </div>
            </div>
          </div>
          <button
            onClick={onBack}
            className="bg-blue-500 text-white px-6 py-2 rounded-lg hover:bg-blue-600 transition-colors"
          >
            Back to Calculator
          </button>
        </div>
      ) : loadingPortfolio ? (
        <div className="flex justify-center items-center py-12">
          <Loader2 className="animate-spin text-blue-500" size={32} />
          <span className="ml-2 text-gray-600">Loading portfolio information...</span>
        </div>
      ) : portfolio ? (
        <>
          <div className="bg-white border rounded-lg p-6 mb-8">
            <h3 className="text-xl font-semibold text-gray-900 mb-4">
              {portfolio.name}
            </h3>
            <p className="text-gray-600 mb-6">
              {portfolio.description}
            </p>
            
            {portfolio.projects && portfolio.projects.length > 0 && (
              <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6 mb-6">
                {portfolio.projects.map((project) => (
                  <div key={project.id} className="bg-gray-50 rounded-lg p-4 hover:shadow-md transition-shadow">
                    <div className="flex items-center space-x-2 mb-3">
                      <ProjectTypeIcon project={project} />
                      <h4 className="font-semibold text-gray-900">{project.name}</h4>
                    </div>
                    {project.imageUrl && (
                      <div className="relative h-32 mb-3 rounded-lg overflow-hidden">
                        <img
                          src={project.imageUrl}
                          alt={project.name}
                          className="absolute inset-0 w-full h-full object-cover"
                        />
                      </div>
                    )}
                    <p className="text-sm text-gray-600 mb-3">
                      {project.shortDescription || project.description}
                    </p>
                    <div className="space-y-1 text-sm">
                      {project.location && (
                        <div className="flex justify-between">
                          <span className="text-gray-500">Location:</span>
                          <span className="text-gray-900">{project.location}</span>
                        </div>
                      )}
                      {project.type && (
                        <div className="flex justify-between">
                          <span className="text-gray-500">Type:</span>
                          <span className="text-gray-900">{project.type}</span>
                        </div>
                      )}
                      {project.verificationStandard && (
                        <div className="flex justify-between">
                          <span className="text-gray-500">Standard:</span>
                          <span className="text-gray-900">{project.verificationStandard}</span>
                        </div>
                      )}
                      {project.impactMetrics?.co2Reduced && (
                        <div className="flex justify-between">
                          <span className="text-gray-500">Impact:</span>
                          <span className="text-gray-900">{project.impactMetrics.co2Reduced.toLocaleString()} tons CO₂</span>
                        </div>
                      )}
                    </div>
                  </div>
                ))}
              </div>
            )}

            <div className="flex items-center justify-between bg-blue-50 p-4 rounded-lg">
              <span className="text-blue-900 font-medium">Portfolio Price per Ton:</span>
              <span className="text-blue-900 font-bold text-lg">
                {renderPortfolioPrice(portfolio)}
              </span>
            </div>
          </div>

          <div className="bg-gray-50 rounded-lg p-6 mb-6">
            <h3 className="text-lg font-semibold text-gray-900 mb-4">Order Summary</h3>
          <div className="space-y-4">
            <div className="flex justify-between">
              <span className="text-gray-600">Amount to Offset:</span>
              <span className="font-medium">{tons.toFixed(2)} tons CO₂</span>
            </div>
            <div className="flex justify-between">
              <span className="text-gray-600">Portfolio Distribution:</span>
              <span className="font-medium">Automatically optimized</span>
            </div>
            <div className="flex justify-between">
              <span className="text-gray-600">Cost per Ton:</span>
              <span className="font-medium">{renderPortfolioPrice(portfolio)}</span>
            </div>
            <div className="border-t pt-4">
                <div className="flex justify-between">
                  <span className="text-gray-900 font-semibold">Total Cost:</span>
                  <span className="text-gray-900 font-semibold">
                    {formatCurrency(offsetCost, getCurrencyByCode(portfolio.currency))}
                  </span>
                </div>
              </div>
            </div>
          </div>

          <button
            onClick={handleOffsetOrder}
            disabled={loading}
            className={`w-full bg-blue-500 text-white py-3 px-4 rounded-lg transition-colors ${
              loading ? 'opacity-50 cursor-not-allowed' : 'hover:bg-blue-600'
            }`}
          >
            {loading ? (
              <div className="flex items-center justify-center">
                <Loader2 className="animate-spin mr-2" size={20} />
                Processing...
              </div>
            ) : (
              'Confirm Offset Order'
            )}
          </button>
        </>
      ) : null}
    </div>
  );
}