import { useState } from 'react';
import { Link as RouterLink } from 'react-router-dom';
import {
  Box,
  Container,
  Typography,
  Button,
  Grid,
  Card,
  CardContent,
  Chip,
  Stack,
  Accordion,
  AccordionSummary,
  AccordionDetails,
  Table,
  TableBody,
  TableCell,
  TableContainer,
  TableHead,
  TableRow,
  Paper,
} from '@mui/material';
import CheckIcon from '@mui/icons-material/Check';
import CloseIcon from '@mui/icons-material/Close';
import ExpandMoreIcon from '@mui/icons-material/ExpandMore';
import OpenInNewIcon from '@mui/icons-material/OpenInNew';
import LocalShippingIcon from '@mui/icons-material/LocalShipping';
import InventoryIcon from '@mui/icons-material/Inventory';
import SupportAgentIcon from '@mui/icons-material/SupportAgent';
import BuildIcon from '@mui/icons-material/Build';

import Layout from '../components/Layout';
import DecorativeShape from '../components/DecorativeShape';

// Product data
const products = {
  wireless: {
    name: 'Reachy Mini',
    tagline: 'The complete experience',
    price: 449,
    badge: 'Wireless',
    badgeColor: '#0ea5e9',
    description: 'Self-contained robot with on-board compute. Works wirelessly or wired, perfect for standalone projects and demos. Ships in 90 days',
    buyLink: 'https://buy.stripe.com/9B65kFfFlaKFbY34W873G03',
    image: '/assets/reachy-wireless.png',
    featured: true,
  },
  lite: {
    name: 'Reachy Mini Lite',
    tagline: 'Perfect to get started',
    price: 299,
    badge: 'Lite',
    badgeColor: '#f59e0b',
    description: 'Connect to your computer via USB. Same expressive robot, powered by your machine. Ideal for development and learning. Ships in 90 days',
    buyLink: 'https://buy.stripe.com/6oUfZj78P1a5e6b0FS73G02',
    image: '/assets/reachy-lite.png',
    featured: false,
  },
};

// Comparison features
const comparisonFeatures = [
  { name: 'Motors & Mechanics', wireless: '9 servo motors', lite: '9 servo motors' },
  { name: 'Head Movement', wireless: '6 DOF (pitch, roll, yaw, x, y, z)', lite: '6 DOF (pitch, roll, yaw, x, y, z)' },
  { name: 'Body Rotation', wireless: '±160°', lite: '±160' },
  { name: 'Antennas', wireless: '2 animated antennas', lite: '2 animated antennas' },
  { name: 'Camera', wireless: 'Wide angle', lite: 'Wide angle' },
  { name: 'Microphones', wireless: '4 microphones array', lite: '4 microphones array' },
  { name: 'Speaker', wireless: '5W speaker', lite: '5W speaker' },
  { name: 'On-board Compute', wireless: 'Raspberry Pi 4 (16GB storage)', lite: false },
  { name: 'Accelerometer', wireless: 'Built-in IMU', lite: false },
  { name: 'Wi-Fi Connectivity', wireless: 'Wi-Fi', lite: false },
  { name: 'Standalone Mode', wireless: true, lite: false },
  { name: 'USB Connection', wireless: true, lite: true },
  { name: 'Power', wireless: 'Battery powered + power supply (7.3V / 5A)', lite: 'Power supply (7.3V / 5A)' },
];

// What's in the box
const boxContents = [
  { icon: '🤖', title: 'Plastic Parts', description: 'All structural components are injection molded and ready to assemble' },
  { icon: '⚙️', title: 'Motors & Electronics', description: '9 servo motors, control board, and two electronic boards' },
  { icon: '📷', title: 'Camera Module', description: 'Wide-angle camera for vision applications' },
  { icon: '🔊', title: 'Audio System', description: '4 microphones array + 5W speaker for voice interaction' },
  { icon: '🔧', title: 'Hardware Kit', description: 'All screws, cables, and tools included' },
  { icon: '📖', title: 'Documentation', description: 'Step-by-step assembly guide and quickstart materials' },
];

// FAQ data
const faqItems = [
  {
    question: 'What is the difference between Wireless and Lite?',
    answer: 'The Wireless version includes a Raspberry Pi 4 built-in, allowing it to run standalone without a computer. The Lite version connects to your Mac, Linux, or Windows computer via USB and uses your computer for processing. Both versions have the same mechanical design and audio/video capabilities.',
  },
  {
    question: 'How long does assembly take?',
    answer: 'Most users report 1.5–2 hours for assembly. The kit comes with pre-printed parts and clear step-by-step video instructions. No soldering required!',
  },
  {
    question: 'What about customs and import taxes?',
    answer: 'The displayed price does not include customs duties or import taxes, which vary by country. You may be responsible for these fees upon delivery.',
  },
  {
    question: 'Can I upgrade from Lite to Wireless later?',
    answer: 'The electronics architecture is different between versions, so a direct upgrade isn\'t possible. However, you can always purchase the Wireless version separately if you want standalone capabilities.',
  },
  {
    question: 'What software is included?',
    answer: 'All software is open-source and free. You get access to the Python SDK, desktop dashboard, and the entire library of community-built applications on Hugging Face Spaces.',
  },
];

// Hero Section
function HeroSection() {
  return (
    <Box
      sx={{
        background: 'linear-gradient(135deg, #0f0f0f 0%, #1a1a2e 50%, #16213e 100%)',
        color: 'white',
        pt: { xs: 14, md: 18 },
        pb: { xs: 10, md: 14 },
        position: 'relative',
        overflow: 'hidden',
      }}
    >
      {/* Decorative elements */}
      <DecorativeShape
        color="#FF9500"
        size={200}
        type="ring"
        top={-60}
        right={-40}
        opacity={0.08}
        floatRange={15}
      />
      <DecorativeShape
        color="#0ea5e9"
        size={80}
        type="circle"
        top={120}
        right={180}
        opacity={0.12}
        floatRange={8}
        floatSpeed={4000}
      />
      <DecorativeShape
        color="#f59e0b"
        size={50}
        type="square"
        bottom={60}
        left={80}
        rotation={15}
        opacity={0.1}
        floatRange={6}
        floatSpeed={5000}
      />

      <Container maxWidth="lg">
        <Box sx={{ textAlign: 'center', position: 'relative', zIndex: 1 }}>
          <Typography
            variant="overline"
            sx={{ color: 'rgba(255,255,255,0.6)', mb: 2, display: 'block', letterSpacing: '0.15em' }}
          >
            Open Source Robot Kit
          </Typography>
          
          <Typography
            variant="h1"
            sx={{
              mb: 3,
              background: 'linear-gradient(135deg, #fff 0%, #e0e0e0 100%)',
              backgroundClip: 'text',
              WebkitBackgroundClip: 'text',
              WebkitTextFillColor: 'transparent',
            }}
          >
            Buy Reachy Mini
          </Typography>
          
          <Typography
            variant="h5"
            sx={{
              color: 'rgba(255,255,255,0.75)',
              fontWeight: 400,
              maxWidth: 700,
              mx: 'auto',
              mb: 5,
              lineHeight: 1.6,
            }}
          >
            An expressive companion robot designed for human interaction, creative coding, and AI experimentation. Assemble in 2 hours, code in Python, endless possibilities.
          </Typography>

          {/* <Stack
            direction={{ xs: 'column', sm: 'row' }}
            spacing={2}
            justifyContent="center"
            alignItems="center"
          >
            <Chip
              icon={<LocalShippingIcon sx={{ fontSize: 18 }} />}
              label="Free worldwide shipping"
              sx={{
                bgcolor: 'rgba(255,255,255,0.1)',
                color: 'white',
                fontSize: 13,
                fontWeight: 500,
                px: 1,
              }}
            />
            <Chip
              icon={<InventoryIcon sx={{ fontSize: 18 }} />}
              label="Ships in 3-5 days"
              sx={{
                bgcolor: 'rgba(255,255,255,0.1)',
                color: 'white',
                fontSize: 13,
                fontWeight: 500,
                px: 1,
              }}
            />
            <Chip
              icon={<SupportAgentIcon sx={{ fontSize: 18 }} />}
              label="1-year warranty"
              sx={{
                bgcolor: 'rgba(255,255,255,0.1)',
                color: 'white',
                fontSize: 13,
                fontWeight: 500,
                px: 1,
              }}
            />
          </Stack> */}
        </Box>
      </Container>
    </Box>
  );
}

// Product Cards Section
function ProductCardsSection() {
  const [hoveredCard, setHoveredCard] = useState(null);

  return (
    <Container maxWidth="lg" sx={{ mt: -8, position: 'relative', zIndex: 10 }}>
      <Grid container spacing={4} justifyContent="center">
        {Object.entries(products).map(([key, product]) => (
          <Grid key={key} size={{ xs: 12, md: 6 }} sx={{ maxWidth: 500 }}>
            <Card
              onMouseEnter={() => setHoveredCard(key)}
              onMouseLeave={() => setHoveredCard(null)}
              sx={{
                height: '100%',
                display: 'flex',
                flexDirection: 'column',
                position: 'relative',
                overflow: 'visible',
                border: product.featured ? '2px solid' : '1px solid',
                borderColor: product.featured ? '#FF9500' : 'divider',
                transform: hoveredCard === key ? 'translateY(-8px)' : 'none',
                boxShadow: hoveredCard === key 
                  ? '0 20px 60px rgba(0, 0, 0, 0.15)' 
                  : '0 8px 32px rgba(0, 0, 0, 0.08)',
                transition: 'all 0.3s ease',
              }}
            >
              {product.featured && (
                <Chip
                  label="Most Popular"
                  size="small"
                  sx={{
                    position: 'absolute',
                    top: -12,
                    left: '50%',
                    transform: 'translateX(-50%)',
                    bgcolor: '#FF9500',
                    color: 'white',
                    fontWeight: 700,
                    fontSize: 11,
                  }}
                />
              )}

              <CardContent sx={{ p: 4, flex: 1, display: 'flex', flexDirection: 'column' }}>
                {/* Badge */}
                <Chip
                  label={product.badge}
                  size="small"
                  sx={{
                    width: 'fit-content',
                    mb: 2,
                    backgroundColor: `${product.badgeColor}20`,
                    color: product.badgeColor,
                    fontWeight: 700,
                    textTransform: 'uppercase',
                    letterSpacing: '0.05em',
                  }}
                />

                {/* Title & Tagline */}
                <Typography variant="h3" sx={{ mb: 0.5, fontSize: '28px' }}>
                  {product.name}
                </Typography>
                <Typography variant="body2" color="text.secondary" sx={{ mb: 2 }}>
                  {product.tagline}
                </Typography>

                {/* Price */}
                <Box sx={{ mb: 3 }}>
                  <Typography
                    component="span"
                    sx={{
                      fontSize: 48,
                      fontWeight: 700,
                      letterSpacing: '-0.03em',
                      color: 'text.primary',
                    }}
                  >
                    ${product.price}
                  </Typography>
                  <Typography
                    component="span"
                    sx={{ fontSize: 16, color: 'text.secondary', ml: 1 }}
                  >
                    USD
                  </Typography>
                </Box>

                {/* Description */}
                <Typography
                  variant="body2"
                  color="text.secondary"
                  sx={{ mb: 3, lineHeight: 1.6, flex: 1 }}
                >
                  {product.description}
                </Typography>

                {/* Key highlights */}
                <Stack spacing={1} sx={{ mb: 3 }}>
                  {key === 'wireless' ? (
                    <>
                      <FeatureRow icon="✓" text="On-board Raspberry Pi 4" highlight />
                      <FeatureRow icon="✓" text="Wi-Fi + USB connectivity" highlight />
                      <FeatureRow icon="✓" text="Built-in IMU" highlight />
                    </>
                  ) : (
                    <>
                      <FeatureRow icon="✓" text="Same expressive design" />
                      <FeatureRow icon="✓" text="Connect via USB to computer" />
                      <FeatureRow icon="✓" text="Perfect for development" />
                    </>
                  )}
                </Stack>

                {/* CTA Button */}
                <Button
                  variant={product.featured ? 'contained' : 'outlined'}
                  size="large"
                  fullWidth
                  href={product.buyLink}
                  target="_blank"
                  rel="noopener noreferrer"
                  endIcon={<OpenInNewIcon />}
                  sx={product.featured ? {
                    bgcolor: '#FF9500',
                    '&:hover': { bgcolor: '#e68600' },
                  } : {}}
                >
                  Buy {product.badge} — ${product.price}
                </Button>
              </CardContent>
            </Card>
          </Grid>
        ))}
      </Grid>
    </Container>
  );
}

// Feature row helper
function FeatureRow({ icon, text, highlight = false }) {
  return (
    <Box sx={{ display: 'flex', alignItems: 'center', gap: 1 }}>
      <Typography sx={{ color: highlight ? '#FF9500' : 'success.main', fontWeight: 600 }}>
        {icon}
      </Typography>
      <Typography variant="body2" color="text.secondary">
        {text}
      </Typography>
    </Box>
  );
}

// Comparison Table Section
function ComparisonSection() {
  return (
    <Box sx={{ py: 10, bgcolor: 'background.alt' }}>
      <Container maxWidth="lg">
        <Box sx={{ textAlign: 'center', mb: 6 }}>
          <Typography variant="overline" color="text.secondary" sx={{ mb: 1, display: 'block' }}>
            Compare Versions
          </Typography>
          <Typography variant="h3" sx={{ mb: 2 }}>
            Full Feature Comparison
          </Typography>
          <Typography variant="body1" color="text.secondary" sx={{ maxWidth: 600, mx: 'auto' }}>
            Both versions share the same mechanical design and audio/video capabilities. 
            The main difference is the on-board compute.
          </Typography>
        </Box>

        <TableContainer 
          component={Paper} 
          sx={{ 
            borderRadius: 3, 
            overflow: 'hidden',
            boxShadow: '0 4px 24px rgba(0, 0, 0, 0.06)',
          }}
        >
          <Table>
            <TableHead>
              <TableRow sx={{ bgcolor: 'background.alt' }}>
                <TableCell sx={{ fontWeight: 700, fontSize: 15, py: 2.5 }}>
                  Feature
                </TableCell>
                <TableCell align="center" sx={{ fontWeight: 700, fontSize: 15, py: 2.5 }}>
                  <Stack direction="row" spacing={1} alignItems="center" justifyContent="center">
                    <Chip label="Wireless" size="small" sx={{ bgcolor: '#0ea5e920', color: '#0ea5e9', fontWeight: 600 }} />
                    <Typography fontWeight={700}>$449</Typography>
                  </Stack>
                </TableCell>
                <TableCell align="center" sx={{ fontWeight: 700, fontSize: 15, py: 2.5 }}>
                  <Stack direction="row" spacing={1} alignItems="center" justifyContent="center">
                    <Chip label="Lite" size="small" sx={{ bgcolor: '#f59e0b20', color: '#f59e0b', fontWeight: 600 }} />
                    <Typography fontWeight={700}>$299</Typography>
                  </Stack>
                </TableCell>
              </TableRow>
            </TableHead>
            <TableBody>
              {comparisonFeatures.map((feature, index) => (
                <TableRow 
                  key={feature.name}
                  sx={{ 
                    '&:nth-of-type(odd)': { bgcolor: 'rgba(0, 0, 0, 0.02)' },
                    '&:last-child td': { borderBottom: 0 },
                  }}
                >
                  <TableCell sx={{ py: 2 }}>
                    <Typography fontWeight={500}>{feature.name}</Typography>
                  </TableCell>
                  <TableCell align="center" sx={{ py: 2 }}>
                    <FeatureValue value={feature.wireless} />
                  </TableCell>
                  <TableCell align="center" sx={{ py: 2 }}>
                    <FeatureValue value={feature.lite} />
                  </TableCell>
                </TableRow>
              ))}
            </TableBody>
          </Table>
        </TableContainer>
      </Container>
    </Box>
  );
}

// Feature value helper
function FeatureValue({ value }) {
  if (value === true) {
    return <CheckIcon sx={{ color: 'success.main', fontSize: 22 }} />;
  }
  if (value === false) {
    return <CloseIcon sx={{ color: 'text.disabled', fontSize: 22 }} />;
  }
  return <Typography variant="body2" color="text.secondary">{value}</Typography>;
}

// What's in the Box Section
function WhatsInTheBoxSection() {
  return (
    <Box sx={{ py: 10 }}>
      <Container maxWidth="lg">
        <Box sx={{ textAlign: 'center', mb: 6 }}>
          <Typography variant="overline" color="text.secondary" sx={{ mb: 1, display: 'block' }}>
            Complete Kit
          </Typography>
          <Typography variant="h3" sx={{ mb: 2 }}>
            What's in the Box
          </Typography>
          <Typography variant="body1" color="text.secondary" sx={{ maxWidth: 600, mx: 'auto' }}>
            Everything you need to build your Reachy Mini. No 3D printer or soldering required.
          </Typography>
        </Box>

        <Grid container spacing={3}>
          {boxContents.map((item, index) => (
            <Grid key={index} size={{ xs: 12, sm: 6, md: 4 }}>
              <Card sx={{ height: '100%', p: 3 }}>
                <Box sx={{ fontSize: 40, mb: 2 }}>{item.icon}</Box>
                <Typography variant="h6" sx={{ mb: 1 }}>
                  {item.title}
                </Typography>
                <Typography variant="body2" color="text.secondary">
                  {item.description}
                </Typography>
              </Card>
            </Grid>
          ))}
        </Grid>

        <Box sx={{ textAlign: 'center', mt: 5 }}>
          <Button
            component={RouterLink}
            to="/getting-started"
            variant="outlined"
            startIcon={<BuildIcon />}
          >
            View Assembly Guide
          </Button>
        </Box>
      </Container>
    </Box>
  );
}

// FAQ Section
function FAQSection() {
  return (
    <Box sx={{ py: 10, bgcolor: 'background.alt' }}>
      <Container maxWidth="md">
        <Box sx={{ textAlign: 'center', mb: 6 }}>
          <Typography variant="overline" color="text.secondary" sx={{ mb: 1, display: 'block' }}>
            Questions?
          </Typography>
          <Typography variant="h3" sx={{ mb: 2 }}>
            Frequently Asked
          </Typography>
        </Box>

        <Stack spacing={2}>
          {faqItems.map((item, index) => (
            <Accordion key={index}>
              <AccordionSummary expandIcon={<ExpandMoreIcon />}>
                <Typography fontWeight={600}>{item.question}</Typography>
              </AccordionSummary>
              <AccordionDetails>
                <Typography variant="body2" color="text.secondary" sx={{ lineHeight: 1.7 }}>
                  {item.answer}
                </Typography>
              </AccordionDetails>
            </Accordion>
          ))}
        </Stack>

        <Box sx={{ textAlign: 'center', mt: 5 }}>
          <Typography variant="body2" color="text.secondary" sx={{ mb: 2 }}>
            Still have questions?
          </Typography>
          <Button
            variant="text"
            href="https://discord.gg/2bAhWfXme9"
            target="_blank"
            endIcon={<OpenInNewIcon />}
          >
            Ask on Discord
          </Button>
        </Box>
      </Container>
    </Box>
  );
}

// Final CTA Section
function FinalCTASection() {
  return (
    <Box
      sx={{
        py: 12,
        background: 'linear-gradient(135deg, #0f0f0f 0%, #1a1a2e 100%)',
        color: 'white',
        textAlign: 'center',
        position: 'relative',
        overflow: 'hidden',
      }}
    >
      <DecorativeShape
        color="#FF9500"
        size={150}
        type="ring"
        top={-50}
        left={-30}
        opacity={0.1}
        floatRange={10}
      />

      <Container maxWidth="md" sx={{ position: 'relative', zIndex: 1 }}>
        <Typography variant="h3" sx={{ mb: 2 }}>
          Ready to build your Reachy Mini?
        </Typography>
        <Typography
          variant="body1"
          sx={{ color: 'rgba(255,255,255,0.7)', mb: 5, maxWidth: 500, mx: 'auto' }}
        >
          Join hundreds of makers, developers, and AI enthusiasts who are already creating with Reachy Mini.
        </Typography>

        <Stack
          direction={{ xs: 'column', sm: 'row' }}
          spacing={2}
          justifyContent="center"
        >
          <Button
            variant="contained"
            size="large"
            href={products.wireless.buyLink}
            target="_blank"
            endIcon={<OpenInNewIcon />}
            sx={{
              bgcolor: '#FF9500',
              px: 4,
              '&:hover': { bgcolor: '#e68600' },
            }}
          >
            Buy Wireless — $449
          </Button>
          <Button
            variant="outlined"
            size="large"
            href={products.lite.buyLink}
            target="_blank"
            endIcon={<OpenInNewIcon />}
            sx={{
              borderColor: 'rgba(255,255,255,0.3)',
              color: 'white',
              px: 4,
              '&:hover': {
                borderColor: 'white',
                bgcolor: 'rgba(255,255,255,0.1)',
              },
            }}
          >
            Buy Lite — $299
          </Button>
        </Stack>
      </Container>
    </Box>
  );
}

// Main Buy Page
export default function Buy() {
  return (
    <Layout transparentHeader>
      <HeroSection />
      <ProductCardsSection />
      <ComparisonSection />
      <WhatsInTheBoxSection />
      <FAQSection />
      <FinalCTASection />
    </Layout>
  );
}