#!/usr/bin/env node
/**
 * Generate PowerPoint presentation from synthesis data
 * Uses pptxgenjs library to create professional presentations
 */

const fs = require('fs');
const path = require('path');

// Note: In production, install via npm install pptxgenjs
// For this example, we'll show the structure
let PptxGenJS;
try {
    PptxGenJS = require('pptxgenjs');
} catch (e) {
    console.log('📦 Installing pptxgenjs... Run: npm install pptxgenjs');
    process.exit(1);
}

class PresentationGenerator {
    constructor(synthesisData) {
        this.synthesis = synthesisData;
        this.pptx = new PptxGenJS();
        this.setupPresentation();
        this.defineLayouts();
    }

    setupPresentation() {
        // Set presentation properties
        this.pptx.layout = 'LAYOUT_16x9';
        this.pptx.author = this.synthesis.metadata.author || 'Research Team';
        this.pptx.company = 'Generated by Research-to-Presentation';
        this.pptx.title = this.synthesis.metadata.title || 'Research Presentation';
        
        // Define theme colors
        this.colors = {
            primary: '#1a73e8',
            secondary: '#34a853', 
            accent: '#ea4335',
            dark: '#202124',
            light: '#f8f9fa',
            text: '#3c4043',
            subtext: '#5f6368'
        };
        
        // Define font styles
        this.fonts = {
            title: { face: 'Arial', size: 44, bold: true },
            heading: { face: 'Arial', size: 32, bold: true },
            subheading: { face: 'Arial', size: 24, bold: false },
            body: { face: 'Arial', size: 18 },
            small: { face: 'Arial', size: 14 }
        };
    }

    defineLayouts() {
        // Define master slides/layouts
        this.pptx.defineSlideMaster({
            title: 'CUSTOM_LAYOUT',
            background: { color: this.colors.light },
            objects: [
                // Footer with slide number
                {
                    text: {
                        text: '[[slideNumber]]',
                        options: {
                            x: 8.5,
                            y: 5,
                            w: 1,
                            h: 0.4,
                            fontSize: 12,
                            color: this.colors.subtext
                        }
                    }
                }
            ]
        });
    }

    generate() {
        console.log('🎨 Generating slides...');
        
        this.synthesis.slide_plan.forEach(slide => {
            switch(slide.type) {
                case 'title':
                    this.createTitleSlide(slide);
                    break;
                case 'executive_summary':
                    this.createExecutiveSummarySlide(slide);
                    break;
                case 'agenda':
                    this.createAgendaSlide(slide);
                    break;
                case 'content':
                    this.createContentSlide(slide);
                    break;
                case 'data_visualization':
                    this.createDataSlide(slide);
                    break;
                case 'recommendations':
                    this.createRecommendationsSlide(slide);
                    break;
                case 'closing':
                    this.createClosingSlide(slide);
                    break;
                default:
                    this.createContentSlide(slide);
            }
        });
        
        return this.pptx;
    }

    createTitleSlide(slideData) {
        const slide = this.pptx.addSlide({ masterName: 'CUSTOM_LAYOUT' });
        
        // Add background gradient
        slide.background = {
            fill: {
                type: 'gradient',
                colors: [
                    { color: this.colors.primary, position: 0 },
                    { color: this.colors.secondary, position: 100 }
                ]
            }
        };
        
        // Title
        slide.addText(slideData.title, {
            x: 0.5,
            y: 2,
            w: 9,
            h: 1.5,
            fontSize: 44,
            bold: true,
            color: 'FFFFFF',
            align: 'center'
        });
        
        // Subtitle
        if (slideData.subtitle) {
            slide.addText(slideData.subtitle, {
                x: 0.5,
                y: 3.5,
                w: 9,
                h: 0.75,
                fontSize: 24,
                color: 'FFFFFF',
                align: 'center'
            });
        }
        
        // Speaker notes
        if (slideData.speaker_notes) {
            slide.addNotes(slideData.speaker_notes);
        }
    }

    createExecutiveSummarySlide(slideData) {
        const slide = this.pptx.addSlide({ masterName: 'CUSTOM_LAYOUT' });
        
        // Title
        slide.addText(slideData.title, {
            x: 0.5,
            y: 0.5,
            w: 9,
            h: 0.75,
            ...this.fonts.heading,
            color: this.colors.primary
        });
        
        // Summary content
        slide.addText(slideData.content, {
            x: 0.5,
            y: 1.5,
            w: 9,
            h: 1.5,
            ...this.fonts.body,
            color: this.colors.text
        });
        
        // Key points
        if (slideData.key_points && slideData.key_points.length > 0) {
            const bulletPoints = slideData.key_points.map(point => ({
                text: point,
                options: { bullet: true }
            }));
            
            slide.addText(bulletPoints, {
                x: 0.5,
                y: 3.25,
                w: 9,
                h: 2,
                ...this.fonts.body,
                color: this.colors.text,
                bullet: { type: 'circle' }
            });
        }
        
        slide.addNotes(slideData.speaker_notes || '');
    }

    createAgendaSlide(slideData) {
        const slide = this.pptx.addSlide({ masterName: 'CUSTOM_LAYOUT' });
        
        // Title
        slide.addText(slideData.title, {
            x: 0.5,
            y: 0.5,
            w: 9,
            h: 0.75,
            ...this.fonts.heading,
            color: this.colors.primary
        });
        
        // Agenda items
        const agendaItems = slideData.items.map((item, index) => ({
            text: `${index + 1}. ${item}`,
            options: { 
                fontSize: 20,
                bullet: false,
                indentLevel: 0
            }
        }));
        
        slide.addText(agendaItems, {
            x: 1,
            y: 1.5,
            w: 8,
            h: 3.5,
            color: this.colors.text,
            lineSpacing: 32
        });
        
        // Duration footer
        if (slideData.total_duration) {
            slide.addText(`Total Duration: ${slideData.total_duration} minutes`, {
                x: 0.5,
                y: 5,
                w: 4,
                h: 0.4,
                ...this.fonts.small,
                color: this.colors.subtext
            });
        }
        
        slide.addNotes(slideData.speaker_notes || '');
    }

    createContentSlide(slideData) {
        const slide = this.pptx.addSlide({ masterName: 'CUSTOM_LAYOUT' });
        
        // Title
        slide.addText(slideData.title, {
            x: 0.5,
            y: 0.5,
            w: 9,
            h: 0.75,
            ...this.fonts.heading,
            color: this.colors.primary
        });
        
        // Determine layout based on content
        const hasData = slideData.data && slideData.data.length > 0;
        const contentWidth = hasData ? 5 : 9;
        
        // Bullet points
        if (slideData.bullets && slideData.bullets.length > 0) {
            const bulletPoints = slideData.bullets.map(point => ({
                text: point,
                options: { bullet: true }
            }));
            
            slide.addText(bulletPoints, {
                x: 0.5,
                y: 1.5,
                w: contentWidth,
                h: 3.5,
                ...this.fonts.body,
                color: this.colors.text,
                bullet: { type: 'circle' },
                lineSpacing: 24
            });
        }
        
        // Data table if present
        if (hasData) {
            const tableData = [
                ['Metric', 'Value'],
                ...slideData.data.map(d => [d.metric, d.value])
            ];
            
            slide.addTable(tableData, {
                x: 6,
                y: 1.5,
                w: 3.5,
                h: 2,
                fontSize: 14,
                border: { pt: 1, color: this.colors.secondary },
                fill: { color: this.colors.light }
            });
        }
        
        slide.addNotes(slideData.speaker_notes || '');
    }

    createDataSlide(slideData) {
        const slide = this.pptx.addSlide({ masterName: 'CUSTOM_LAYOUT' });
        
        // Title
        slide.addText(slideData.title, {
            x: 0.5,
            y: 0.5,
            w: 9,
            h: 0.75,
            ...this.fonts.heading,
            color: this.colors.primary
        });
        
        // Create data table
        if (slideData.data_points && slideData.data_points.length > 0) {
            const tableData = [
                ['Source', 'Metric', 'Value'],
                ...slideData.data_points.map(dp => [
                    dp.source || '',
                    dp.metric,
                    dp.value
                ])
            ];
            
            slide.addTable(tableData, {
                x: 0.5,
                y: 1.5,
                w: 9,
                h: 3.5,
                fontSize: 16,
                border: { pt: 1, color: this.colors.secondary },
                fill: { color: this.colors.light },
                rowH: 0.5
            });
        }
        
        slide.addNotes(slideData.speaker_notes || '');
    }

    createRecommendationsSlide(slideData) {
        const slide = this.pptx.addSlide({ masterName: 'CUSTOM_LAYOUT' });
        
        // Title
        slide.addText(slideData.title, {
            x: 0.5,
            y: 0.5,
            w: 9,
            h: 0.75,
            ...this.fonts.heading,
            color: this.colors.primary
        });
        
        // Recommendations as numbered list
        const recommendations = slideData.items.map((item, index) => ({
            text: `${index + 1}. ${item}`,
            options: {
                fontSize: 20,
                bullet: false
            }
        }));
        
        slide.addText(recommendations, {
            x: 0.5,
            y: 1.5,
            w: 9,
            h: 3.5,
            color: this.colors.text,
            lineSpacing: 28
        });
        
        slide.addNotes(slideData.speaker_notes || '');
    }

    createClosingSlide(slideData) {
        const slide = this.pptx.addSlide({ masterName: 'CUSTOM_LAYOUT' });
        
        // Gradient background
        slide.background = {
            fill: {
                type: 'gradient',
                colors: [
                    { color: this.colors.secondary, position: 0 },
                    { color: this.colors.primary, position: 100 }
                ]
            }
        };
        
        // Thank you text
        slide.addText(slideData.title, {
            x: 0.5,
            y: 2,
            w: 9,
            h: 1,
            fontSize: 48,
            bold: true,
            color: 'FFFFFF',
            align: 'center'
        });
        
        // Subtitle
        if (slideData.subtitle) {
            slide.addText(slideData.subtitle, {
                x: 0.5,
                y: 3.5,
                w: 9,
                h: 0.75,
                fontSize: 28,
                color: 'FFFFFF',
                align: 'center'
            });
        }
        
        slide.addNotes(slideData.speaker_notes || '');
    }

    async save(outputPath) {
        try {
            await this.pptx.writeFile({ fileName: outputPath });
            console.log(`✅ Presentation saved: ${outputPath}`);
        } catch (error) {
            console.error(`❌ Error saving presentation: ${error}`);
            throw error;
        }
    }
}

// Main execution
async function main() {
    const args = process.argv.slice(2);
    
    if (args.length < 2) {
        console.log('Usage: node generate_pptx.js <synthesis.json> <output.pptx>');
        process.exit(1);
    }
    
    const synthesisFile = args[0];
    const outputFile = args[1];
    
    console.log(`📊 Loading synthesis from: ${synthesisFile}`);
    
    try {
        // Load synthesis data
        const synthesisData = JSON.parse(
            fs.readFileSync(synthesisFile, 'utf8')
        );
        
        // Generate presentation
        const generator = new PresentationGenerator(synthesisData);
        const presentation = generator.generate();
        
        // Save to file
        await generator.save(outputFile);
        
        console.log(`📈 Created ${synthesisData.slide_plan.length} slides`);
        
    } catch (error) {
        console.error(`❌ Error: ${error.message}`);
        process.exit(1);
    }
}

// Run if called directly
if (require.main === module) {
    main();
}

module.exports = { PresentationGenerator };