#!/usr/bin/env node

/**
 * Tilbudgivern Debug Tool
 * Et avanceret diagnosticering værktøj for at identificere problemer
 */

const http = require('http');
const { spawn } = require('child_process');

class DebugTool {
    constructor() {
        this.tests = [
            { name: 'Server Health Check', method: 'checkServer' },
            { name: 'Frontend Assets Check', method: 'checkAssets' },
            { name: 'API Endpoints Check', method: 'checkAPI' },
            { name: 'Database Connection', method: 'checkDatabase' },
            { name: 'PM2 Process Status', method: 'checkPM2' },
            { name: 'Recent Error Analysis', method: 'analyzeErrors' }
        ];
    }

    async run() {
        console.log('\n🔧 Tilbudgivern Advanced Debug Tool\n');
        console.log('═'.repeat(50));
        
        for (const test of this.tests) {
            try {
                console.log(`\n📋 ${test.name}...`);
                await this[test.method]();
                console.log('✅ PASSED');
            } catch (error) {
                console.log(`❌ FAILED: ${error.message}`);
            }
        }
        
        console.log('\n' + '═'.repeat(50));
        console.log('🎯 Debug Complete! Tjek resultaterne ovenfor.\n');
    }

    checkServer() {
        return new Promise((resolve, reject) => {
            const req = http.get('http://localhost:4030', (res) => {
                if (res.statusCode === 200) {
                    console.log(`   Status: ${res.statusCode} OK`);
                    console.log(`   Headers: ${JSON.stringify(res.headers, null, 2)}`);
                    resolve();
                } else {
                    reject(new Error(`Server returned ${res.statusCode}`));
                }
            });
            
            req.on('error', (err) => {
                reject(new Error(`Connection failed: ${err.message}`));
            });
            
            req.setTimeout(5000, () => {
                reject(new Error('Request timeout'));
            });
        });
    }

    checkAssets() {
        return new Promise((resolve, reject) => {
            // Check main JS file
            const req = http.get('http://localhost:4030/static/js/main.a016d298.js', (res) => {
                if (res.statusCode === 200) {
                    console.log('   React JS bundle: ✅ Loaded');
                    
                    // Check CSS file
                    const cssReq = http.get('http://localhost:4030/static/css/main.a0ad9f95.css', (cssRes) => {
                        if (cssRes.statusCode === 200) {
                            console.log('   CSS bundle: ✅ Loaded');
                            resolve();
                        } else {
                            reject(new Error(`CSS bundle failed: ${cssRes.statusCode}`));
                        }
                    });
                    
                    cssReq.on('error', (err) => reject(new Error(`CSS error: ${err.message}`)));
                } else {
                    reject(new Error(`JS bundle failed: ${res.statusCode}`));
                }
            });
            
            req.on('error', (err) => reject(new Error(`Asset check error: ${err.message}`)));
        });
    }

    async checkAPI() {
        const endpoints = [
            '/api/materials',
            '/api/material-packages',
            '/api/quotes'
        ];
        
        for (const endpoint of endpoints) {
            try {
                await this.testEndpoint(endpoint);
                console.log(`   ${endpoint}: ✅ Responding`);
            } catch (error) {
                console.log(`   ${endpoint}: ❌ ${error.message}`);
            }
        }
    }

    testEndpoint(path) {
        return new Promise((resolve, reject) => {
            const req = http.get(`http://localhost:4030${path}`, (res) => {
                if (res.statusCode < 500) {
                    resolve();
                } else {
                    reject(new Error(`Server error ${res.statusCode}`));
                }
            });
            
            req.on('error', (err) => reject(new Error(err.message)));
            req.setTimeout(3000, () => reject(new Error('Timeout')));
        });
    }

    async checkDatabase() {
        return new Promise((resolve, reject) => {
            // Test database connection via API
            const req = http.get('http://localhost:4030/api/materials?limit=1', (res) => {
                let data = '';
                res.on('data', (chunk) => data += chunk);
                res.on('end', () => {
                    try {
                        const result = JSON.parse(data);
                        if (Array.isArray(result)) {
                            console.log('   Database: ✅ Connected and responding');
                            console.log(`   Sample data: ${result.length} materials available`);
                            resolve();
                        } else {
                            reject(new Error('Unexpected response format'));
                        }
                    } catch (error) {
                        reject(new Error(`Parse error: ${error.message}`));
                    }
                });
            });
            
            req.on('error', (err) => reject(new Error(`DB test failed: ${err.message}`)));
        });
    }

    async checkPM2() {
        return new Promise((resolve, reject) => {
            const pm2 = spawn('pm2', ['status'], { stdio: 'pipe' });
            let output = '';
            
            pm2.stdout.on('data', (data) => output += data);
            pm2.stderr.on('data', (data) => output += data);
            
            pm2.on('close', (code) => {
                if (code === 0) {
                    console.log('   PM2 Status:');
                    const lines = output.split('\n');
                    lines.forEach(line => {
                        if (line.includes('tilbudgivern') || line.includes('online') || line.includes('stopped')) {
                            console.log(`     ${line}`);
                        }
                    });
                    resolve();
                } else {
                    reject(new Error(`PM2 command failed with code ${code}`));
                }
            });
        });
    }

    async analyzeErrors() {
        return new Promise((resolve, reject) => {
            const pm2 = spawn('pm2', ['logs', 'tilbudgivern-unified', '--lines', '50', '--nostream'], { stdio: 'pipe' });
            let output = '';
            
            pm2.stdout.on('data', (data) => output += data);
            pm2.stderr.on('data', (data) => output += data);
            
            pm2.on('close', (code) => {
                const errors = output.split('\n').filter(line => 
                    line.toLowerCase().includes('error') || 
                    line.toLowerCase().includes('failed') ||
                    line.toLowerCase().includes('exception')
                );
                
                if (errors.length > 0) {
                    console.log(`   Recent Errors (${errors.length} found):`);
                    errors.slice(-5).forEach(error => {
                        console.log(`     ${error.trim()}`);
                    });
                } else {
                    console.log('   No recent errors found');
                }
                resolve();
            });
        });
    }
}

// Kør debug tool
if (require.main === module) {
    const debugTool = new DebugTool();
    debugTool.run().catch(console.error);
}

module.exports = DebugTool;