#!/usr/bin/env node
/**
 * Build standalone HTML with embedded data
 * Run: node agent-evolution/scripts/build-standalone.cjs
 */

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

const DATA_FILE = path.join(__dirname, '../data/agent-versions.json');
const HTML_FILE = path.join(__dirname, '../index.html');
const OUTPUT_FILE = path.join(__dirname, '../index.standalone.html');

try {
    // Read data
    console.log('📖 Reading data from:', DATA_FILE);
    const data = JSON.parse(fs.readFileSync(DATA_FILE, 'utf-8'));
    console.log('   Found', Object.keys(data.agents).length, 'agents');
    
    // Read HTML
    console.log('📖 Reading HTML from:', HTML_FILE);
    let html = fs.readFileSync(HTML_FILE, 'utf-8');
    
    // Step 1: Replace EMBEDDED_DATA
    const startMarker = '// Default embedded data (minimal - updated by sync script)';
    const endPattern = /"sync_sources":\s*\[[^\]]*\]\s*\}\s*\};/;
    
    const startIdx = html.indexOf(startMarker);
    const endMatch = html.match(endPattern);
    
    if (startIdx === -1) {
        throw new Error('Start marker not found in HTML');
    }
    if (!endMatch) {
        throw new Error('End pattern not found in HTML');
    }
    
    const endIdx = endMatch.index + endMatch[0].length + 1;
    
    // Create embedded data
    const embeddedData = `// Embedded data (generated ${new Date().toISOString()})
const EMBEDDED_DATA = ${JSON.stringify(data, null, 2)};`;
    
    // Replace the section
    html = html.substring(0, startIdx) + embeddedData + html.substring(endIdx);
    
    // Step 2: Replace entire init function
    // Find the init function start and end
    const initStartPattern = /\/\/ Initialize\s*\n\s*async function init\(\) \{/;
    const initStartMatch = html.match(initStartPattern);
    
    if (initStartMatch) {
        const initStartIdx = initStartMatch.index;
        
        // Find matching closing brace (count opening and closing)
        let braceCount = 0;
        let inFunction = false;
        let initEndIdx = initStartIdx;
        
        for (let i = initStartIdx; i < html.length; i++) {
            if (html[i] === '{') {
                braceCount++;
                inFunction = true;
            } else if (html[i] === '}') {
                braceCount--;
                if (inFunction && braceCount === 0) {
                    initEndIdx = i + 1;
                    break;
                }
            }
        }
        
        // New init function
        const newInit = `// Initialize
async function init() {
    // Use embedded data directly (works with file://)
    agentData = EMBEDDED_DATA;
    
    try {
        document.getElementById('lastSync').textContent = formatDate(agentData.lastUpdated);
        document.getElementById('agentCount').textContent = agentData.evolution_metrics.total_agents + ' agents';
        document.getElementById('historyCount').textContent = agentData.evolution_metrics.agents_with_history + ' with history';
        
        if (agentData.evolution_metrics.total_agents === 0) {
            document.getElementById('lastSync').textContent = 'No data - run sync:evolution';
            return;
        }
        
        renderOverview();
        renderAllAgents();
        renderTimeline();
        renderRecommendations();
        renderMatrix();
    } catch (error) {
        console.error('Failed to render dashboard:', error);
        document.getElementById('lastSync').textContent = 'Error rendering data';
    }
}`;
        
        html = html.substring(0, initStartIdx) + newInit + html.substring(initEndIdx);
    }
    
    // Write output
    fs.writeFileSync(OUTPUT_FILE, html);
    
    console.log('\n✅ Built standalone dashboard');
    console.log('   Output:', OUTPUT_FILE);
    console.log('   Agents:', Object.keys(data.agents).length);
    console.log('   Size:', (fs.statSync(OUTPUT_FILE).size / 1024).toFixed(1), 'KB');
    console.log('\n📊 Open in browser:');
    console.log('   Windows: start agent-evolution\\index.standalone.html');
    console.log('   macOS:   open agent-evolution/index.standalone.html');
    console.log('   Linux:   xdg-open agent-evolution/index.standalone.html');
} catch (error) {
    console.error('❌ Error:', error.message);
    process.exit(1);
}