import React, { useState, useEffect, useCallback } from 'react';
import { Check, AlertCircle, ArrowLeft, Loader2, Globe2, TreePine, Waves, Factory, Wind, X, User, Mail, Phone, Building, Flame, Snowflake, Mountain, Sprout, Package, Droplet, Leaf, Zap } from 'lucide-react';
import { motion, AnimatePresence } from 'framer-motion';
import { getPortfolios } from '../api/wrenClient';
import { createCheckoutSession } from '../api/checkoutClient';
import type { OffsetOrder as OffsetOrderType, Portfolio, OffsetProject } from '../types';
import { currencies, formatCurrency } from '../utils/currencies';
import { config } from '../utils/config';
import { sendFormspreeEmail } from '../utils/email';
import { logger } from '../utils/logger';
import { FormInput } from './forms/FormInput';
import { FormTextarea } from './forms/FormTextarea';
import { RadialProgress } from './RadialProgress';
import { PortfolioDonutChart } from './PortfolioDonutChart';
import { getProjectColor } from '../utils/portfolioColors';
import { CertificationBadge } from './CertificationBadge';
import { CarbonImpactComparison } from './CarbonImpactComparison';
import { useCalculatorState } from '../hooks/useCalculatorState';

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

interface ProjectTypeIconProps {
  project: OffsetProject;
}

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

  const name = project.name.toLowerCase();

  // Match on project name to determine appropriate icon
  if (name.includes('rainforest') || name.includes('forest')) {
    return <TreePine className="text-green-600" />;
  } else if (name.includes('biochar') && name.includes('carbon removal')) {
    return <Flame className="text-orange-600" />;
  } else if (name.includes('refrigerant')) {
    return <Snowflake className="text-cyan-600" />;
  } else if (name.includes('rock weathering') || name.includes('enhanced weathering')) {
    return <Mountain className="text-amber-700" />;
  } else if (name.includes('rice paddies') || name.includes('paddies')) {
    return <Sprout className="text-green-500" />;
  } else if (name.includes('mangrove') || name.includes('blue carbon')) {
    return <Waves className="text-blue-600" />;
  } else if (name.includes('biomass storage') || name.includes('underground')) {
    return <Package className="text-amber-800" />;
  } else if (name.includes('bio-oil') || name.includes('oil')) {
    return <Droplet className="text-blue-700" />;
  } else if (name.includes('adipic') || name.includes('nitrous oxide') || name.includes('factory')) {
    return <Factory className="text-gray-600" />;
  } else if (name.includes('renewable') || name.includes('wind') || name.includes('solar')) {
    return <Wind className="text-green-500" />;
  } else if (name.includes('direct air capture') || name.includes('dac')) {
    return <Zap className="text-purple-600" />;
  } else {
    return <Globe2 className="text-blue-500" />;
  }
};

export function OffsetOrder({ tons, monetaryAmount, onBack, calculatorType }: Props) {
  const { state: savedState, saveState } = useCalculatorState();

  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 [portfolio, setPortfolio] = useState<Portfolio | null>(null);
  const [loadingPortfolio, setLoadingPortfolio] = useState(true);
  const [offsetPercentage, setOffsetPercentage] = useState(
    savedState?.offsetPercentage ?? 100 // Default to 100% or use saved value
  );

  // Calculate price per ton (rounded up)
  const roundedPricePerTon = portfolio ? Math.ceil(portfolio.pricePerTon || 18) : 18;

  // Calculate the actual tons to offset based on percentage
  // If monetaryAmount is provided (custom amount), calculate tons from the monetary amount
  const baseTons = monetaryAmount ? (monetaryAmount / roundedPricePerTon) : tons;
  const actualOffsetTons = (baseTons * offsetPercentage) / 100;

  // Format tons for display
  const formatTons = (tons: number): string => {
    const fixed = tons.toFixed(2);
    const parts = fixed.split('.');
    parts[0] = parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ',');
    return parts.join('.');
  };

  const [formData, setFormData] = useState({
    name: '',
    email: '',
    phone: '',
    company: '',
    message: `I would like to offset ${formatTons(actualOffsetTons)} tons of CO2 from my yacht's ${calculatorType} emissions.`
  });

  // Update form message when percentage changes
  useEffect(() => {
    setFormData(prev => ({
      ...prev,
      message: `I would like to offset ${formatTons(actualOffsetTons)} tons of CO2 (${offsetPercentage}% of ${formatTons(tons)} tons) from my yacht's ${calculatorType} emissions.`
    }));
  }, [offsetPercentage, actualOffsetTons, tons, calculatorType]);

  // Save offset percentage and portfolio ID to localStorage
  useEffect(() => {
    if (savedState) {
      saveState({
        ...savedState,
        offsetPercentage,
        portfolioId: portfolio?.id,
      });
    }
  }, [offsetPercentage, portfolio, savedState, saveState]);

  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) {
        logger.log('[OffsetOrder] Found Puffin portfolio with ID:', puffinPortfolio.id);
        setPortfolio(puffinPortfolio);
      } else {
        // Default to first portfolio if no puffin portfolio found
        logger.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 {
      logger.info('[OffsetOrder] Creating checkout session for', actualOffsetTons, 'tons with portfolio', portfolio.id);

      // Create Stripe Checkout Session
      const checkoutSession = await createCheckoutSession({
        tons: actualOffsetTons,
        portfolioId: portfolio.id,
        pricePerTon: roundedPricePerTon, // Pass the rounded-up price that matches calculator display
      });

      logger.info('[OffsetOrder] Checkout session created:', checkoutSession.sessionId);

      // Redirect to Stripe Checkout
      window.location.href = checkoutSession.url;
    } catch (err) {
      logger.error('[OffsetOrder] Failed to create checkout session:', err);
      setError('Failed to create checkout session. Please try again.');
      setLoading(false);
    }
  };

  const renderPortfolioPrice = (portfolio: Portfolio) => {
    try {
      // Get the price per ton from the portfolio and round UP to next whole number
      const pricePerTon = Math.ceil(portfolio.pricePerTon || 18);
      return formatCurrency(pricePerTon, currencies.USD);
    } catch (err) {
      console.error('Error formatting portfolio price:', err);
      return formatCurrency(18, currencies.USD);
    }
  };

  // Calculate offset cost using the portfolio price (rounded UP to match display)
  const offsetCost = monetaryAmount || (portfolio ? actualOffsetTons * roundedPricePerTon : 0);

  return (
    <motion.div 
      className="bg-white rounded-lg shadow-xl p-4 sm:p-8 max-w-7xl w-full relative mx-auto"
      initial={{ opacity: 0, y: 30 }}
      animate={{ opacity: 1, y: 0 }}
      transition={{ duration: 0.6, ease: [0.22, 1, 0.36, 1] }}
    >
      <motion.button
        onClick={onBack}
        className="flex items-center text-gray-600 hover:text-gray-900 mb-6"
        initial={{ opacity: 0, x: -20 }}
        animate={{ opacity: 1, x: 0 }}
        transition={{ duration: 0.5 }}
        whileHover={{ x: -5 }}
        type="button"
      >
        <ArrowLeft className="mr-2" size={20} />
        Back to Calculator
      </motion.button>

      <motion.div 
        className="text-center mb-8"
        initial={{ opacity: 0, y: 20 }}
        animate={{ opacity: 1, y: 0 }}
        transition={{ duration: 0.5, delay: 0.2 }}
      >
        <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 {formatTons(tons)} tons of CO₂
        </p>
      </motion.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">
              <FormInput
                id="offset-name"
                label="Name *"
                icon={<User size={20} />}
                type="text"
                required
                value={formData.name}
                onChange={(e) => setFormData(prev => ({ ...prev, name: e.target.value }))}
              />
              <FormInput
                id="offset-email"
                label="Email *"
                icon={<Mail size={20} />}
                type="email"
                required
                value={formData.email}
                onChange={(e) => setFormData(prev => ({ ...prev, email: e.target.value }))}
              />
              <FormInput
                id="offset-phone"
                label="Phone"
                icon={<Phone size={20} />}
                type="tel"
                value={formData.phone}
                onChange={(e) => setFormData(prev => ({ ...prev, phone: e.target.value }))}
              />
              <FormInput
                id="offset-company"
                label="Company"
                icon={<Building size={20} />}
                type="text"
                value={formData.company}
                onChange={(e) => setFormData(prev => ({ ...prev, company: e.target.value }))}
              />
              <FormTextarea
                id="offset-message"
                label="Message"
                rows={4}
                value={formData.message}
                onChange={(e) => setFormData(prev => ({ ...prev, message: e.target.value }))}
              />
              <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-0">
              {portfolio.description}
            </p>

            {/* Portfolio Allocation Visualization */}
            {portfolio.projects && portfolio.projects.length > 0 && (
              <motion.div
                className="bg-white rounded-lg px-6 pt-4 pb-6 shadow-md border border-gray-200 mb-8 mt-6"
                initial={{ opacity: 0, y: 20 }}
                animate={{ opacity: 1, y: 0 }}
                transition={{ duration: 0.5, delay: 0.2 }}
              >
                <h4 className="text-xl font-semibold text-gray-900 mb-0 md:mb-0 text-center">Portfolio Distribution</h4>
                <div className="mt-2 md:-mt-12">
                  <PortfolioDonutChart
                    projects={portfolio.projects}
                    totalTons={actualOffsetTons}
                  />
                </div>
              </motion.div>
            )}

            {/* Project Cards */}
            {portfolio.projects && portfolio.projects.length > 0 && (
              <motion.div
                className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4 sm:gap-6 mb-6"
                initial={{ opacity: 0 }}
                animate={{ opacity: 1 }}
                transition={{ duration: 0.5, delay: 0.3 }}
              >
                {portfolio.projects.map((project, index) => (
                  <motion.div
                    key={project.id || `project-${index}`}
                    className="bg-white rounded-lg p-6 shadow-md hover:shadow-xl transition-all border border-gray-200 hover:border-blue-400 relative group flex flex-col h-full"
                    initial={{ opacity: 0, y: 20 }}
                    animate={{ opacity: 1, y: 0 }}
                    transition={{ duration: 0.3, delay: index * 0.1 }}
                    whileHover={{ scale: 1.02 }}
                  >
                    {/* Header with title and radial progress */}
                    <div className="flex items-start justify-between mb-4 min-h-[60px]">
                      <div className="flex items-start space-x-3 flex-1 pr-2">
                        <div className="mt-1">
                          <ProjectTypeIcon project={project} />
                        </div>
                        <h4 className="font-bold text-gray-900 text-lg leading-tight">{project.name}</h4>
                      </div>
                      {project.percentage && (
                        <RadialProgress
                          percentage={project.percentage * 100}
                          size={56}
                          color={getProjectColor(index, portfolio.projects.length)}
                          delay={index * 0.1 + 0.3}
                        />
                      )}
                    </div>

                    {/* Project image */}
                    {project.imageUrl && (
                      <div className="relative h-40 mb-4 rounded-lg overflow-hidden">
                        <img
                          src={project.imageUrl}
                          alt={project.name}
                          className="w-full h-full object-cover transition-transform duration-300 group-hover:scale-105"
                        />
                        <div className="absolute inset-0 bg-gradient-to-t from-black/20 to-transparent opacity-0 group-hover:opacity-100 transition-opacity" />
                      </div>
                    )}

                    {/* Description - This will grow to push price and button to bottom */}
                    <p className="text-gray-600 mb-3 leading-relaxed flex-grow">
                      {project.shortDescription || project.description}
                    </p>

                    <CertificationBadge status={project.certificationStatus} size="sm" />

                  </motion.div>
                ))}
              </motion.div>
            )}

            <motion.div 
              className="flex items-center justify-between bg-blue-50 p-4 rounded-lg"
              initial={{ opacity: 0, scale: 0.95 }}
              animate={{ opacity: 1, scale: 1 }}
              transition={{ duration: 0.5, delay: 0.5 }}
            >
              <span className="text-blue-900 font-medium">Portfolio Price per Ton:</span>
              <span className="text-blue-900 font-bold text-lg">
                {renderPortfolioPrice(portfolio)}
              </span>
            </motion.div>
          </div>

          {/* Offset Percentage Slider */}
          {!monetaryAmount && (
            <motion.div
              className="bg-white border rounded-lg p-6 mb-6"
              initial={{ opacity: 0, y: 20 }}
              animate={{ opacity: 1, y: 0 }}
              transition={{ duration: 0.5, delay: 0.55 }}
            >
              <h3 className="text-lg font-semibold text-gray-900 mb-4">Choose Your Offset Amount</h3>
              <div className="space-y-4">
                <div>
                  <div className="flex justify-between items-center mb-4">
                    <span className="text-gray-600">Offset Percentage:</span>
                    <span className="text-2xl font-bold text-blue-600">{offsetPercentage}%</span>
                  </div>
                  <div className="relative">
                    {/* Tick marks - visible notches */}
                    <div className="absolute top-1/2 -translate-y-1/2 left-0 w-full h-2 pointer-events-none flex justify-between items-center">
                      {[0, 25, 50, 75, 100].map((tick) => (
                        <div
                          key={tick}
                          className="w-[2px] h-2 rounded-full"
                          style={{
                            backgroundColor: tick <= offsetPercentage ? 'rgba(255, 255, 255, 0.6)' : 'rgba(0, 0, 0, 0.2)'
                          }}
                        ></div>
                      ))}
                    </div>
                    {/* Slider */}
                    <input
                      type="range"
                      min="0"
                      max="100"
                      value={offsetPercentage}
                      onChange={(e) => setOffsetPercentage(Number(e.target.value))}
                      className="relative z-10 w-full h-3 bg-gray-200 rounded-lg appearance-none cursor-pointer slider"
                      style={{
                        background: `linear-gradient(to right, #3b82f6 0%, #3b82f6 ${offsetPercentage}%, #e5e7eb ${offsetPercentage}%, #e5e7eb 100%)`
                      }}
                    />
                  </div>
                  {/* Percentage labels aligned with tick marks */}
                  <div className="relative mt-2 h-4">
                    <span className="text-xs text-gray-500 absolute left-0">0%</span>
                    <span className="text-xs text-gray-500 absolute left-1/4 -translate-x-1/2">25%</span>
                    <span className="text-xs text-gray-500 absolute left-1/2 -translate-x-1/2">50%</span>
                    <span className="text-xs text-gray-500 absolute left-3/4 -translate-x-1/2">75%</span>
                    <span className="text-xs text-gray-500 absolute right-0">100%</span>
                  </div>
                </div>
                <div className="bg-blue-50 p-4 rounded-lg">
                  <div className="flex justify-between items-center">
                    <span className="text-gray-700">CO₂ to Offset:</span>
                    <span className="text-xl font-bold text-blue-900">
                      {formatTons(actualOffsetTons)} tons
                    </span>
                  </div>
                  <div className="text-sm text-blue-600 mt-1">
                    {offsetPercentage}% of {formatTons(tons)} tons total emissions
                  </div>
                </div>
              </div>
            </motion.div>
          )}

          <motion.div
            className="bg-gray-50 rounded-lg p-6 mb-6"
            initial={{ opacity: 0, y: 20 }}
            animate={{ opacity: 1, y: 0 }}
            transition={{ duration: 0.5, delay: 0.62 }}
          >
            <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 text-right">{formatTons(actualOffsetTons)} tons CO₂</span>
              </div>
              <div className="flex justify-between">
                <span className="text-gray-600">Portfolio Distribution:</span>
                <span className="font-medium text-right">Automatically optimized</span>
              </div>
              <div className="flex justify-between">
                <span className="text-gray-600">Cost per Ton:</span>
                <span className="font-medium text-right">{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 text-right">
                    {formatCurrency(offsetCost, currencies.USD)}
                  </span>
                </div>
              </div>
            </div>
          </motion.div>

          <motion.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'
            }`}
            initial={{ opacity: 0, y: 20 }}
            animate={{ opacity: 1, y: 0 }}
            transition={{ duration: 0.5, delay: 0.7 }}
            whileHover={{ scale: 1.02 }}
            whileTap={{ scale: 0.98 }}
          >
            {loading ? (
              <div className="flex items-center justify-center">
                <Loader2 className="animate-spin mr-2" size={20} />
                Redirecting to checkout...
              </div>
            ) : (
              'Proceed to Checkout'
            )}
          </motion.button>
        </>
      ) : null}
    </motion.div>
  );
}