const express = require('express');
const cors = require('cors');
const stripe = require('stripe')(process.env.STRIPE_SECRET_KEY);
const { calculatePlanetaryLines, getTimezone } = require('./astrology-engine');
const { geocodeLocation } = require('./geocode');
const PDFDocument = require('pdfkit');
const path = require('path');

const app = express();
app.use(cors());
app.use(express.json());
app.use(express.static('.'));

// Database simulation (use PostgreSQL in production)
const readings = new Map();
const payments = new Map();

// Calculate astrocartography using real Swiss Ephemeris calculations
app.post('/api/calculate-astrocartography', async (req, res) => {
    try {
        const { date, time, location, email } = req.body;
        
        // 1. Geocode birth location
        const geoData = await geocodeLocation(location);
        if (!geoData || !geoData.lat || !geoData.lng) {
            throw new Error('Failed to geocode location');
        }
        
        // 2. Create proper UTC date from birth data
        // Parse date and time
        const [year, month, day] = date.split('-').map(Number);
        const [hours, minutes] = time.split(':').map(Number);
        
        // Create date in local timezone then convert to UTC equivalent
        // For precise calculations, we need the exact moment in UTC
        const birthDate = new Date(Date.UTC(year, month - 1, day, hours - geoData.offset, minutes));
        
        // 3. Calculate planetary lines using Swiss Ephemeris
        console.log(`Calculating chart for ${email} - ${date} ${time} at ${geoData.lat},${geoData.lng}`);
        const planetaryData = await calculatePlanetaryLines({
            date: birthDate,
            lat: geoData.lat,
            lng: geoData.lng,
            timezone: geoData.timezone
        });
        
        // 4. Generate summary recommendations
        const recommendations = generateRecommendations(planetaryData, geoData);
        
        // 5. Save reading to database
        const readingId = Date.now().toString(36) + Math.random().toString(36).substr(2);
        readings.set(readingId, {
            email,
            date: new Date(),
            birthData: { date, time, location, lat: geoData.lat, lng: geoData.lng },
            planetaryData,
            recommendations
        });
        
        // 6. Format response for frontend
        const formattedLines = planetaryData.map(planet => ({
            planet: planet.planet,
            color: planet.color,
            longitude: planet.longitude,
            latitude: planet.latitude,
            retrograde: planet.retrograde,
            strongestAngle: planet.strongestAngle,
            closestPoint: planet.coordinates,
            meaning: planet.meaning,
            nearbyCities: planet.nearbyCities,
            interpretations: planet.interpretations,
            // Include line coordinates for mapping
            lines: {
                MC: planet.lines.MC.slice(0, 35), // Sample every 5 degrees from 85 to -85
                IC: planet.lines.IC.slice(0, 35),
                ASC: planet.lines.ASC, // Variable length based on visibility
                DSC: planet.lines.DSC
            }
        }));
        
        res.json({
            success: true,
            reportId: readingId,
            birthLocation: {
                name: geoData.displayName,
                lat: geoData.lat,
                lng: geoData.lng,
                timezone: geoData.timezone
            },
            planetaryLines: formattedLines,
            recommendations,
            calculationMethod: 'Swiss Ephemeris 2.10',
            ephemerisDate: new Date().toISOString()
        });
        
    } catch (error) {
        console.error('Calculation error:', error);
        res.status(500).json({ 
            success: false,
            error: 'Calculation failed: ' + error.message 
        });
    }
});

// Stripe payment intent creation
app.post('/api/create-payment-intent', async (req, res) => {
    try {
        const { amount, email, readingId } = req.body;
        
        const paymentIntent = await stripe.paymentIntents.create({
            amount: amount, // amount in cents (2900 for $29)
            currency: 'usd',
            receipt_email: email,
            metadata: { 
                service: 'astrocartography',
                readingId: readingId || 'pending'
            }
        });
        
        // Store payment intent mapping
        payments.set(paymentIntent.id, {
            email,
            readingId: readingId || null,
            status: 'pending'
        });
        
        res.json({ 
            success: true,
            clientSecret: paymentIntent.client_secret 
        });
    } catch (error) {
        console.error('Payment error:', error);
        res.status(500).json({ 
            success: false,
            error: error.message 
        });
    }
});

// Stripe webhook for payment confirmation
app.post('/api/webhook', express.raw({type: 'application/json'}), async (req, res) => {
    const sig = req.headers['stripe-signature'];
    let event;
    
    try {
        event = stripe.webhooks.constructEvent(req.body, sig, process.env.STRIPE_WEBHOOK_SECRET);
    } catch (err) {
        return res.status(400).send(`Webhook Error: ${err.message}`);
    }
    
    if (event.type === 'payment_intent.succeeded') {
        const paymentIntent = event.data.object;
        const paymentRecord = payments.get(paymentIntent.id);
        
        if (paymentRecord && paymentRecord.readingId) {
            // Update reading as paid
            const reading = readings.get(paymentRecord.readingId);
            if (reading) {
                reading.paid = true;
                reading.paymentDate = new Date();
            }
        }
    }
    
    res.json({received: true});
});

// Generate and download PDF report
app.get('/api/download-report/:id', async (req, res) => {
    const reading = readings.get(req.params.id);
    if (!reading) return res.status(404).send('Reading not found');
    if (!reading.paid) return res.status(403).send('Payment required');
    
    const doc = new PDFDocument({ margin: 50 });
    res.setHeader('Content-Type', 'application/pdf');
    res.setHeader('Content-Disposition', `attachment; filename=cosmic-map-${req.params.id}.pdf`);
    
    doc.pipe(res);
    
    // Header
    doc.fontSize(28).fillColor('#1e1b4b').text('My Cosmic Map', 50, 50);
    doc.fontSize(16).fillColor('#666').text('Personal Astrocartography Report', 50, 85);
    doc.moveTo(50, 110).lineTo(550, 110).stroke('#8b5cf6');
    
    // Meta info
    doc.fontSize(12).fillColor('#333');
    doc.text(`Generated: ${reading.date.toLocaleDateString()}`, 50, 130);
    doc.text(`Birth Location: ${reading.birthData.location}`, 50, 145);
    doc.text(`Birth Time: ${reading.birthData.date} ${reading.birthData.time}`, 50, 160);
    doc.text(`Calculation System: Swiss Ephemeris 2.10`, 50, 175);
    
    let y = 210;
    
    // Planetary Lines
    reading.planetaryData.forEach((planet, index) => {
        if (y > 700) {
            doc.addPage();
            y = 50;
        }
        
        // Planet header with color indicator
        doc.circle(60, y + 8, 5).fill(planet.color || '#666');
        doc.fontSize(18).fillColor('#1e1b4b').text(`${planet.planet} Line`, 75, y);
        doc.fontSize(10).fillColor('#666').text(`Ecliptic: ${planet.longitude}°${planet.retrograde ? ' (R)' : ''}`, 200, y + 5);
        
        y += 30;
        
        // Strongest angle
        doc.fontSize(12).fillColor('#8b5cf6').text(`Strongest Influence: ${planet.strongestAngle} Angle`, 75, y);
        y += 20;
        
        // Nearby cities
        if (planet.nearbyCities && planet.nearbyCities.length > 0) {
            doc.fontSize(11).fillColor('#333').text('Key Locations:', 75, y);
            y += 15;
            planet.nearbyCities.forEach(city => {
                doc.fontSize(10).fillColor('#666').text(`• ${city.name} (${city.angle} line, ${city.distance}° away)`, 90, y);
                y += 12;
            });
            y += 10;
        }
        
        // Interpretation for strongest angle
        const interp = planet.interpretations[planet.strongestAngle];
        doc.fontSize(10).fillColor('#333').text(interp, 75, y, {
            width: 450,
            align: 'left'
        });
        
        y += 60;
        
        // Separator
        if (index < reading.planetaryData.length - 1) {
            doc.moveTo(50, y - 10).lineTo(550, y - 10).stroke('#eee');
        }
    });
    
    // Recommendations
    if (y > 650) {
        doc.addPage();
        y = 50;
    }
    
    doc.fontSize(18).fillColor('#1e1b4b').text('Summary Recommendations', 50, y);
    y += 30;
    
    const recs = reading.recommendations;
    doc.fontSize(12).fillColor('#333');
    doc.text('Career & Public Life:', 50, y);
    doc.fontSize(10).fillColor('#666').text(recs.bestForCareer, 70, y + 15, { width: 480 });
    y += 50;
    
    doc.fontSize(12).fillColor('#333').text('Love & Relationships:', 50, y);
    doc.fontSize(10).fillColor('#666').text(recs.bestForLove, 70, y + 15, { width: 480 });
    y += 50;
    
    doc.fontSize(12).fillColor('#333').text('Energy & Vitality:', 50, y);
    doc.fontSize(10).fillColor('#666').text(recs.bestForEnergy, 70, y + 15, { width: 480 });
    
    // Disclaimer
    doc.addPage();
    doc.fontSize(10).fillColor('#999').text(
        'Disclaimer: This astrocartography report is for entertainment and self-exploration purposes only. ' +
        'Astrological insights should not replace professional legal, medical, or financial advice. ' +
        'Relocation decisions should consider practical factors alongside astrological indications.',
        50, 50, { width: 500, align: 'justify' }
    );
    
    doc.end();
});

// Get reading status
app.get('/api/reading/:id', (req, res) => {
    const reading = readings.get(req.params.id);
    if (!reading) return res.status(404).json({ error: 'Not found' });
    
    res.json({
        paid: reading.paid || false,
        created: reading.date,
        planetaryData: reading.planetaryData ? true : false
    });
});

function generateRecommendations(planetaryData, geoData) {
    // Find best planets for each life area based on angles
    const sunData = planetaryData.find(p => p.planet === 'Sun');
    const venusData = planetaryData.find(p => p.planet === 'Venus');
    const marsData = planetaryData.find(p => p.planet === 'Mars');
    const jupiterData = planetaryData.find(p => p.planet === 'Jupiter');
    const saturnData = planetaryData.find(p => p.planet === 'Saturn');
    
    const careerPlanet = jupiterData || sunData;
    const lovePlanet = venusData;
    const energyPlanet = marsData || sunData;
    
    // Find best cities for each
    const getBestCity = (planetData) => {
        if (!planetData || !planetData.nearbyCities || planetData.nearbyCities.length === 0) {
            return null;
        }
        return planetData.nearbyCities[0];
    };
    
    const careerCity = getBestCity(careerPlanet);
    const loveCity = getBestCity(lovePlanet);
    const energyCity = getBestCity(energyPlanet);
    
    return {
        bestForCareer: careerCity ? 
            `Your ${careerPlanet.planet} line (${careerPlanet.strongestAngle}) runs near ${careerCity.name}. ` +
            `${careerPlanet.interpretations[careerPlanet.strongestAngle]}` :
            'Major metropolitan areas align with your career potential. Look for cities where you feel naturally confident.',
            
        bestForLove: loveCity ?
            `Your Venus line (${venusData.strongestAngle}) influences ${loveCity.name}. ` +
            `${venusData.interpretations[venusData.strongestAngle]}` :
            'Coastal and culturally rich cities may enhance your romantic connections and artistic expression.',
            
        bestForEnergy: energyCity ?
            `Your ${energyPlanet.planet} line (${energyPlanet.strongestAngle}) activates ${energyCity.name}. ` +
            `${energyPlanet.interpretations[energyPlanet.strongestAngle]}` :
            'Locations with active lifestyles and outdoor recreation align with your Mars energy.',
            
        cautionaryNote: saturnData && saturnData.nearbyCities.length > 0 ?
            `Note: Your Saturn line (${saturnData.strongestAngle}) passes near ${saturnData.nearbyCities[0].name}. ` +
            'This brings lessons and maturity but may feel heavy initially.' :
            null
    };
}

const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
    console.log(`🌟 Cosmic Map Server running on port ${PORT}`);
    console.log(`📡 Swiss Ephemeris path: ${path.join(__dirname, 'ephemeris')}`);
});