import { ImageResponse } from 'next/og';
import { NextRequest } from 'next/server';
import { join } from 'path';
import { readFileSync } from 'fs';

export async function GET(req: NextRequest) {
  try {
    const { searchParams } = new URL(req.url);

    // Read metrics
    const score = searchParams.get('score') || '0 / 0';
    const accuracy = searchParams.get('accuracy') || '0%';
    const qs = searchParams.get('qs') || '0';
    const rank = searchParams.get('rank') || '#--';
    
    // Read user info
    const name = searchParams.get('name') || 'Student';
    const target = searchParams.get('target') || 'JEE';
    const plan = searchParams.get('plan') || 'Free';

    // Read date (if passed, otherwise use current date/time)
    const exportDate = searchParams.get('date') || new Intl.DateTimeFormat('en-IN', {
      dateStyle: 'medium',
      timeStyle: 'short',
      timeZone: 'Asia/Kolkata',
    }).format(new Date());

    // Read theme
    const theme = searchParams.get('theme') || 'dark';
    const isDark = theme === 'dark';

    // Theme Variables
    const bgColor = isDark 
      ? 'linear-gradient(145deg, #050505 0%, #111111 50%, #0a0a0a 100%)' 
      : 'linear-gradient(145deg, #f8fafc 0%, #ffffff 50%, #f1f5f9 100%)';
    const textColor = isDark ? '#ffffff' : '#0f172a';
    const gridColor = isDark ? 'rgba(255,255,255,0.05)' : 'rgba(0,0,0,0.05)';
    const cardBg = isDark 
      ? 'linear-gradient(145deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.01) 100%)' 
      : 'linear-gradient(145deg, #ffffff 0%, #f8fafc 100%)';
    const cardBorder = isDark ? '1px solid rgba(255,255,255,0.1)' : '1px solid rgba(0,0,0,0.05)';
    const textSec = isDark ? 'rgba(255,255,255,0.5)' : 'rgba(15,23,42,0.5)';
    const textTert = isDark ? 'rgba(255,255,255,0.7)' : 'rgba(15,23,42,0.7)';
    const dividerColor = isDark ? 'rgba(255,255,255,0.1)' : 'rgba(0,0,0,0.1)';
    const logoName = isDark ? 'Rectangular_dark_background.png' : 'Rectangular_light_background.png';

    // Load logo from disk and convert to base64
    const logoPath = join(process.cwd(), 'public', 'PragatiVeer_Logo', 'PNG_Logos', logoName);
    let logoUrl = '';
    try {
      const logoData = readFileSync(logoPath);
      logoUrl = `data:image/png;base64,${logoData.toString('base64')}`;
    } catch (e) {
      console.error('Failed to load logo', e);
    }

    return new ImageResponse(
      (
        <div
          style={{
            height: '100%',
            width: '100%',
            display: 'flex',
            flexDirection: 'column',
            justifyContent: 'space-between',
            alignItems: 'center',
            background: bgColor,
            color: textColor,
            fontFamily: '"Inter", sans-serif',
            padding: '70px 0',
          }}
        >
          {/* Subtle grid background overlay */}
          <div
            style={{
              position: 'absolute',
              top: 0,
              left: 0,
              right: 0,
              bottom: 0,
              backgroundImage: `radial-gradient(circle at 2px 2px, ${gridColor} 1px, transparent 0)`,
              backgroundSize: '40px 40px',
              zIndex: 0,
            }}
          />

          <div style={{ display: 'flex', flexDirection: 'column', width: '880px', height: '100%', justifyContent: 'space-between', zIndex: 10 }}>
            {/* Header */}
            <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', width: '100%' }}>
              <img src={logoUrl} width={450} height={110} style={{ objectFit: 'contain', marginLeft: '-64px' }} />
              
              <div style={{ display: 'flex', alignItems: 'center', background: 'linear-gradient(90deg, rgba(6,182,212,0.15) 0%, rgba(6,182,212,0.05) 100%)', padding: '12px 28px', borderRadius: 100, border: '1px solid rgba(6,182,212,0.3)' }}>
                <div style={{ width: 12, height: 12, borderRadius: 6, backgroundColor: '#06b6d4', marginRight: 12 }} />
                <span style={{ fontSize: 22, fontWeight: 700, color: '#22d3ee', letterSpacing: '0.05em', textTransform: 'uppercase' }}>
                  Performance Report
                </span>
              </div>
            </div>

            {/* Main Content - 2x2 Grid */}
            <div style={{ display: 'flex', flexWrap: 'wrap', width: '880px', justifyContent: 'space-between', gap: '32px', marginTop: 20 }}>
              
              <div style={{ display: 'flex', flexDirection: 'column', justifyContent: 'center', paddingLeft: 48, width: '424px', height: '240px', background: cardBg, borderRadius: 36, border: cardBorder, boxShadow: isDark ? 'none' : '0 10px 25px rgba(0,0,0,0.02)' }}>
                <span style={{ fontSize: 20, color: textSec, textTransform: 'uppercase', fontWeight: 800, letterSpacing: '0.15em', marginBottom: 12 }}>Today's Score</span>
                <span style={{ fontSize: 64, fontWeight: 900, color: '#facc15', letterSpacing: '-0.02em' }}>{score}</span>
              </div>
              
              <div style={{ display: 'flex', flexDirection: 'column', justifyContent: 'center', paddingLeft: 48, width: '424px', height: '240px', background: cardBg, borderRadius: 36, border: cardBorder, boxShadow: isDark ? 'none' : '0 10px 25px rgba(0,0,0,0.02)' }}>
                <span style={{ fontSize: 20, color: textSec, textTransform: 'uppercase', fontWeight: 800, letterSpacing: '0.15em', marginBottom: 12 }}>Accuracy</span>
                <span style={{ fontSize: 64, fontWeight: 900, color: '#34d399', letterSpacing: '-0.02em' }}>{accuracy}</span>
              </div>
              
              <div style={{ display: 'flex', flexDirection: 'column', justifyContent: 'center', paddingLeft: 48, width: '424px', height: '240px', background: cardBg, borderRadius: 36, border: cardBorder, boxShadow: isDark ? 'none' : '0 10px 25px rgba(0,0,0,0.02)' }}>
                <span style={{ fontSize: 20, color: textSec, textTransform: 'uppercase', fontWeight: 800, letterSpacing: '0.15em', marginBottom: 12 }}>Qs Attempted</span>
                <span style={{ fontSize: 64, fontWeight: 900, color: '#38bdf8', letterSpacing: '-0.02em' }}>{qs}</span>
              </div>
              
              <div style={{ display: 'flex', flexDirection: 'column', justifyContent: 'center', paddingLeft: 48, width: '424px', height: '240px', background: cardBg, borderRadius: 36, border: cardBorder, boxShadow: isDark ? 'none' : '0 10px 25px rgba(0,0,0,0.02)' }}>
                <span style={{ fontSize: 20, color: textSec, textTransform: 'uppercase', fontWeight: 800, letterSpacing: '0.15em', marginBottom: 12 }}>City Rank</span>
                <span style={{ fontSize: 64, fontWeight: 900, color: '#a78bfa', letterSpacing: '-0.02em' }}>{rank}</span>
              </div>
              
            </div>
            
            {/* Footer */}
            <div style={{ display: 'flex', flexDirection: 'column', width: '100%', marginTop: 20 }}>
              {/* Divider */}
              <div style={{ width: '100%', height: '1px', backgroundColor: dividerColor, marginBottom: 40 }} />
              
              <div style={{ display: 'flex', justifyContent: 'space-between', alignItems: 'center', width: '100%' }}>
                <div style={{ display: 'flex', alignItems: 'center' }}>
                  {/* User Avatar Placeholder */}
                  <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'center', width: 80, height: 80, borderRadius: 40, background: 'linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%)', marginRight: 24 }}>
                    <span style={{ fontSize: 36, fontWeight: 800, color: '#ffffff' }}>{name.charAt(0).toUpperCase()}</span>
                  </div>
                  
                  <div style={{ display: 'flex', flexDirection: 'column' }}>
                    <div style={{ fontSize: 44, fontWeight: 900, color: textColor, letterSpacing: '-0.02em' }}>{name}</div>
                    <div style={{ fontSize: 20, color: textSec, marginTop: 4 }}>Generated: {exportDate}</div>
                    <div style={{ display: 'flex', marginTop: 8 }}>
                      <div style={{ fontSize: 22, color: '#06b6d4', fontWeight: 700, marginRight: 16 }}>{`${target} Aspirant`}</div>
                      <div style={{ fontSize: 22, color: textSec, fontWeight: 600 }}>•</div>
                      <div style={{ fontSize: 22, color: textTert, fontWeight: 600, marginLeft: 16 }}>{`${plan} Plan`}</div>
                    </div>
                  </div>
                </div>

                <div style={{ display: 'flex', flexDirection: 'column', alignItems: 'flex-end', gap: '4px' }}>
                  <div style={{ fontSize: 22, color: textTert, fontWeight: 600 }}>pragativeer.com</div>
                  <div style={{ fontSize: 22, color: textSec, fontWeight: 600 }}>contact@pragativeer.com</div>
                  <div style={{ fontSize: 22, color: textSec, fontWeight: 600 }}>+91 9079337961</div>
                </div>
              </div>
            </div>
          </div>
        </div>
      ),
      {
        width: 1080,
        height: 1080,
      }
    );
  } catch (e: any) {
    return new Response(`Failed to generate image`, {
      status: 500,
    });
  }
}