import { jsPDF } from 'jspdf';

interface ReportData {
    reprintCost: number;
    updatesPerYear: number;
    annualWaste: number;
    qrMasterCost: number;
    savings: number;
    savingsPercent: number;
}

export function generateSavingsReport(data: ReportData): void {
    const doc = new jsPDF();
    const pageWidth = doc.internal.pageSize.getWidth();
    const pageHeight = doc.internal.pageSize.getHeight();
    const margin = 20;

    // Brand Colors
    const colors = {
        primary: [79, 70, 229] as [number, number, number],   // Indigo 600
        primaryLight: [224, 231, 255] as [number, number, number], // Indigo 100
        success: [16, 185, 129] as [number, number, number],  // Emerald 500
        successBg: [236, 253, 245] as [number, number, number], // Emerald 50
        text: [30, 41, 59] as [number, number, number],       // Slate 800
        textLight: [100, 116, 139] as [number, number, number], // Slate 500
        border: [226, 232, 240] as [number, number, number],  // Slate 200
        danger: [239, 68, 68] as [number, number, number],    // Red 500
        dangerBg: [254, 242, 242] as [number, number, number], // Red 50
    };

    let currentY = 20;

    // --- Header ---
    // Logo / Brand Name
    doc.setTextColor(...colors.primary);
    doc.setFontSize(24);
    doc.setFont('helvetica', 'bold');
    doc.text('QR Master', margin, currentY + 8);

    // Date (Right aligned)
    doc.setTextColor(...colors.textLight);
    doc.setFontSize(10);
    doc.setFont('helvetica', 'normal');
    const dateStr = new Date().toLocaleDateString('en-US', { year: 'numeric', month: 'long', day: 'numeric' });
    doc.text(dateStr, pageWidth - margin, currentY + 8, { align: 'right' });

    currentY += 20;

    // Title Section
    doc.setLineWidth(0.5);
    doc.setDrawColor(...colors.primary);
    doc.line(margin, currentY, margin + 40, currentY); // Small accent line

    currentY += 10;

    doc.setTextColor(...colors.text);
    doc.setFontSize(28);
    doc.setFont('helvetica', 'bold');
    doc.text('Savings Analysis', margin, currentY);

    currentY += 8;
    doc.setTextColor(...colors.textLight);
    doc.setFontSize(12);
    doc.setFont('helvetica', 'normal');
    doc.text('Prepared specifically for your business based on your input parameters.', margin, currentY);

    currentY += 20;

    // --- Input Summary ---
    // Background for inputs
    doc.setFillColor(248, 250, 252); // Slate 50
    doc.setDrawColor(...colors.border);
    doc.roundedRect(margin, currentY, pageWidth - (margin * 2), 35, 2, 2, 'FD');

    const inputInnerY = currentY + 12;

    // Label 1
    doc.setFontSize(10);
    doc.setTextColor(...colors.textLight);
    doc.text('REPRINT COST PER BATCH', margin + 10, inputInnerY);

    // Value 1
    doc.setFontSize(16);
    doc.setTextColor(...colors.text);
    doc.setFont('helvetica', 'bold');
    doc.text(`€${data.reprintCost.toLocaleString()}`, margin + 10, inputInnerY + 10);

    // Divider
    doc.setDrawColor(...colors.border);
    doc.line(pageWidth / 2, inputInnerY - 5, pageWidth / 2, inputInnerY + 18);

    // Label 2
    doc.setFontSize(10);
    doc.setFont('helvetica', 'normal');
    doc.setTextColor(...colors.textLight);
    doc.text('URL UPDATES/YEAR', (pageWidth / 2) + 10, inputInnerY);

    // Value 2
    doc.setFontSize(16);
    doc.setTextColor(...colors.text);
    doc.setFont('helvetica', 'bold');
    doc.text(`${data.updatesPerYear}`, (pageWidth / 2) + 10, inputInnerY + 10);

    currentY += 50;

    // --- Analysis Results ---

    doc.setFontSize(14);
    doc.setTextColor(...colors.text);
    doc.setFont('helvetica', 'bold');
    doc.text('Cost Analysis', margin, currentY);
    currentY += 10;

    // 1. Static Codes (Bad)
    const cardHeight = 26; // Reduced height
    // perfect vertical centering: (Height 26 / 2) + (Approx cap-height correction ~3) = 16
    const textCenterOffset = 16;

    // Draw "Static" Row
    doc.setDrawColor(...colors.border);
    doc.setFillColor(255, 255, 255);
    doc.roundedRect(margin, currentY, pageWidth - (margin * 2), cardHeight, 2, 2, 'FD');

    // Icon/Label
    doc.setTextColor(...colors.danger);
    doc.setFontSize(11);
    doc.setFont('helvetica', 'bold');
    doc.text('• Static QR Codes', margin + 8, currentY + textCenterOffset);

    doc.setTextColor(...colors.textLight);
    doc.setFontSize(10);
    doc.setFont('helvetica', 'normal');
    // Align sub-label relative to first label
    doc.text('(Print & Reprint Costs)', margin + 50, currentY + textCenterOffset);

    doc.setTextColor(...colors.text);
    doc.setFontSize(12);
    doc.setFont('helvetica', 'bold');
    doc.text(`€${data.annualWaste.toLocaleString()}`, pageWidth - margin - 10, currentY + textCenterOffset, { align: 'right' });

    currentY += cardHeight + 4;

    // Draw "QR Master" Row
    doc.setDrawColor(...colors.border);
    doc.setFillColor(255, 255, 255);
    doc.roundedRect(margin, currentY, pageWidth - (margin * 2), cardHeight, 2, 2, 'FD');

    // Icon/Label
    doc.setTextColor(...colors.success);
    doc.setFontSize(11);
    doc.setFont('helvetica', 'bold');
    doc.text('• QR Master Pro', margin + 8, currentY + textCenterOffset);

    doc.setTextColor(...colors.textLight);
    doc.setFontSize(10);
    doc.setFont('helvetica', 'normal');
    doc.text('(Subscription)', margin + 50, currentY + textCenterOffset);

    doc.setTextColor(...colors.text);
    doc.setFontSize(12);
    doc.setFont('helvetica', 'bold');
    doc.text(`€${data.qrMasterCost.toLocaleString()}`, pageWidth - margin - 10, currentY + textCenterOffset, { align: 'right' });

    currentY += cardHeight + 15;

    // --- PAGE CHANGE: Results & Strategy on Page 2 ---
    doc.addPage();
    currentY = 40;

    // --- TOTAL SAVINGS / INVESTMENT HERO SECTION ---
    // (No line divider needed at top of new page)

    const isPositiveSavings = data.savings > 0;
    const heroColor = isPositiveSavings ? colors.success : colors.primary; // Green or Indigo
    const heroBg = isPositiveSavings ? colors.successBg : colors.primaryLight;

    doc.setTextColor(...colors.textLight);
    doc.setFontSize(11);
    doc.setFont('helvetica', 'bold');

    const heroTitle = isPositiveSavings ? 'PROJECTED ANNUAL SAVINGS' : 'ANNUAL INVESTMENT REQUIRED';
    doc.text(heroTitle, margin, currentY);

    // Big Number and Badge Container
    const savingsY = currentY + 12;

    // 1. The Amount
    doc.setTextColor(...heroColor);
    doc.setFontSize(42);
    doc.setFont('helvetica', 'bold');
    const amountText = `€${Math.abs(data.savings).toLocaleString()}`;
    doc.text(amountText, margin, savingsY + 12);

    // 2. The Percentage Badge (Centered relative to the number)
    const numberWidth = doc.getStringUnitWidth(amountText) * 42 / doc.internal.scaleFactor;
    const badgeX = margin + numberWidth + 10; // Slightly tighter gap

    // Determine badge text and dynamic width
    doc.setFontSize(9);
    doc.setFont('helvetica', 'bold');
    const badgeText = isPositiveSavings ? `${data.savingsPercent}% Saved` : 'Upgrade';
    const textWidth = doc.getStringUnitWidth(badgeText) * 9 / doc.internal.scaleFactor;

    const badgePadding = 12; // 6px on each side
    const badgeWidth = textWidth + badgePadding;
    const badgeHeight = 14; // Reduced height (was 16)

    // Draw Compact Badge
    doc.setFillColor(...heroBg);
    doc.setDrawColor(...heroColor);
    doc.setLineWidth(0.5);
    doc.roundedRect(badgeX, savingsY + 1, badgeWidth, badgeHeight, 6, 6, 'FD'); // y+1 to align better with text baseline

    doc.setTextColor(...heroColor);
    doc.text(badgeText, badgeX + (badgeWidth / 2), savingsY + 10, { align: 'center' }); // Centered

    currentY += 40; // Reduced gap

    // --- Recommended Resources ---
    doc.setTextColor(...colors.text);
    doc.setFontSize(12);
    doc.setFont('helvetica', 'bold');
    doc.text('Recommended Reading', margin, currentY);
    currentY += 8;

    const resources = [
        { title: "The ROI of Dynamic QR Codes", url: "www.qrmaster.net/blog/roi-dynamic-qr" },
        { title: "How to Track Physical Marketing", url: "www.qrmaster.net/blog/tracking-guide" },
        { title: "Best Practices for QR Campaigns", url: "www.qrmaster.net/blog/best-practices" }
    ];

    resources.forEach(res => {
        doc.setTextColor(...colors.primary);
        doc.setFontSize(10);
        doc.setFont('helvetica', 'normal');
        doc.textWithLink(`• ${res.title}`, margin, currentY, { url: `https://${res.url}` });
        currentY += 5;
    });

    currentY += 12;

    // --- Call to Action ---
    // No page check needed, we are on Page 2

    doc.setTextColor(...colors.text);
    doc.setFontSize(12);
    doc.setFont('helvetica', 'bold');
    doc.text('Next Steps', margin, currentY);

    currentY += 8;
    doc.setTextColor(...colors.textLight);
    doc.setFontSize(10);
    doc.setFont('helvetica', 'normal');
    doc.text('Ready to eliminate reprint costs? Create your account today.', margin, currentY);

    currentY += 8; // FIXED: Restored spacing to prevent overlap
    doc.setTextColor(...colors.primary);
    doc.setFont('helvetica', 'bold');
    doc.textWithLink('www.qrmaster.net/signup', margin, currentY, { url: 'https://www.qrmaster.net/signup' });

    currentY += 20;

    // --- Why Dynamic? (Value Add) ---
    // If we are close to bottom, force page 2 for this section to make it look intentional
    if (currentY > pageHeight - 60) {
        doc.addPage();
        currentY = 40;
    }

    doc.setTextColor(...colors.text);
    doc.setFontSize(12);
    doc.setFont('helvetica', 'bold');
    doc.text('Why Professionals Choose Dynamic', margin, currentY);
    currentY += 10;

    const benefits = [
        { title: "Real-time Control", desc: "Update destinations instantly. Fix mistakes locally without reprinting." },
        { title: "Smart Analytics", desc: "Track scans, locations, and device types to measure ROI." },
        { title: "Brand Identity", desc: "Fully customizable designs that match your corporate identity." }
    ];

    benefits.forEach(benefit => {
        // Bullet
        doc.setFillColor(...colors.success); // Green bullets
        doc.circle(margin + 1, currentY - 1, 1.5, 'F');

        // Title
        doc.setTextColor(...colors.text);
        doc.setFontSize(10);
        doc.setFont('helvetica', 'bold');
        doc.text(benefit.title, margin + 6, currentY);

        // Desc
        const titleWidth = doc.getStringUnitWidth(benefit.title) * 10 / doc.internal.scaleFactor;
        doc.setTextColor(...colors.textLight);
        doc.setFont('helvetica', 'normal');
        doc.text(`- ${benefit.desc}`, margin + 6 + titleWidth + 2, currentY);

        currentY += 7;
    });

    // --- Footer ---
    const footerY = pageHeight - 15;
    const pageCount = doc.getNumberOfPages();

    for (let i = 1; i <= pageCount; i++) {
        doc.setPage(i);
        doc.setDrawColor(...colors.border);
        doc.line(margin, footerY - 10, pageWidth - margin, footerY - 10);

        doc.setTextColor(...colors.textLight);
        doc.setFontSize(8);
        doc.setFont('helvetica', 'normal');
        doc.text('© 2026 QR Master. All rights reserved.', margin, footerY);
        doc.text('www.qrmaster.net', pageWidth - margin, footerY, { align: 'right' });
    }

    // Save
    doc.save('QRMaster_Savings_Analysis.pdf');
}