Get Migration Result

// Monitor migration progress in real-time
class MigrationMonitor {
    constructor(checkInterval = 5000) {
        this.checkInterval = checkInterval;
        this.isMonitoring = false;
        this.lastStatus = null;
        this.callbacks = {
            onProgress: null,
            onComplete: null,
            onError: null
        };
    }
    
    async startMonitoring() {
        if (this.isMonitoring) return;
        
        this.isMonitoring = true;
        console.log('Starting migration monitoring...');
        
        while (this.isMonitoring) {
            try {
                const status = await this.checkMigrationStatus();
                await this.handleStatusUpdate(status);
                
                // Stop monitoring if migration is complete or failed
                if (status.status === 'completed' || status.status === 'migrated') {
                    this.isMonitoring = false;
                    if (this.callbacks.onComplete) {
                        this.callbacks.onComplete(status);
                    }
                    break;
                }
                
                // Handle errors
                if (status.last_err) {
                    if (this.callbacks.onError) {
                        this.callbacks.onError(status);
                    }
                }
                
                await this.delay(this.checkInterval);
            } catch (error) {
                console.error('Migration monitoring error:', error);
                if (this.callbacks.onError) {
                    this.callbacks.onError({ error: error.message });
                }
                await this.delay(this.checkInterval);
            }
        }
    }
    
    async checkMigrationStatus() {
        const response = await fetch('/migrate/result');
        return await response.json();
    }
    
    async handleStatusUpdate(status) {
        // Check if status has changed
        if (!this.lastStatus || this.hasStatusChanged(this.lastStatus, status)) {
            console.log(`Migration status: ${status.status}, step: ${status.step}, attempts: ${status.try_count}`);
            
            if (status.last_err) {
                console.warn(`Migration error: ${status.last_err}`);
            }
            
            if (this.callbacks.onProgress) {
                this.callbacks.onProgress(status);
            }
            
            this.lastStatus = status;
        }
    }
    
    hasStatusChanged(oldStatus, newStatus) {
        return oldStatus.status !== newStatus.status ||
               oldStatus.step !== newStatus.step ||
               oldStatus.try_count !== newStatus.try_count ||
               oldStatus.last_err !== newStatus.last_err;
    }
    
    stopMonitoring() {
        this.isMonitoring = false;
        console.log('Migration monitoring stopped');
    }
    
    onProgress(callback) {
        this.callbacks.onProgress = callback;
    }
    
    onComplete(callback) {
        this.callbacks.onComplete = callback;
    }
    
    onError(callback) {
        this.callbacks.onError = callback;
    }
    
    delay(ms) {
        return new Promise(resolve => setTimeout(resolve, ms));
    }
}

// Usage
const monitor = new MigrationMonitor(3000); // Check every 3 seconds

monitor.onProgress((status) => {
    updateProgressUI(status);
});

monitor.onComplete((status) => {
    showCompletionNotification(status);
});

monitor.onError((status) => {
    showErrorAlert(status);
});

await monitor.startMonitoring();

// Create a comprehensive migration dashboard
class MigrationDashboard {
    constructor() {
        this.migrationHistory = [];
        this.currentMigration = null;
        this.monitor = new MigrationMonitor(2000);
        this.setupEventHandlers();
    }
    
    setupEventHandlers() {
        this.monitor.onProgress((status) => {
            this.updateCurrentMigration(status);
            this.renderDashboard();
        });
        
        this.monitor.onComplete((status) => {
            this.completeMigration(status);
            this.renderDashboard();
            this.showNotification('Migration completed successfully!', 'success');
        });
        
        this.monitor.onError((status) => {
            this.handleMigrationError(status);
            this.renderDashboard();
            this.showNotification(`Migration error: ${status.last_err || status.error}`, 'error');
        });
    }
    
    async startDashboard() {
        // Initialize dashboard
        this.renderDashboard();
        
        // Check initial status
        try {
            const initialStatus = await this.monitor.checkMigrationStatus();
            this.updateCurrentMigration(initialStatus);
            
            // Start monitoring if migration is in progress
            if (initialStatus.status === 'running') {
                await this.monitor.startMonitoring();
            }
        } catch (error) {
            console.error('Failed to get initial migration status:', error);
        }
    }
    
    updateCurrentMigration(status) {
        this.currentMigration = {
            ...status,
            timestamp: new Date().toISOString(),
            progress: this.calculateProgress(status.step)
        };
    }
    
    calculateProgress(step) {
        const steps = ['user', 'channel', 'message', 'conversation', 'cleanup'];
        const stepIndex = steps.indexOf(step);
        return stepIndex >= 0 ? ((stepIndex + 1) / steps.length) * 100 : 0;
    }
    
    completeMigration(status) {
        const completedMigration = {
            ...this.currentMigration,
            completedAt: new Date().toISOString(),
            duration: this.calculateDuration()
        };
        
        this.migrationHistory.push(completedMigration);
        this.currentMigration = null;
    }
    
    handleMigrationError(status) {
        if (this.currentMigration) {
            this.currentMigration.hasError = true;
            this.currentMigration.errorDetails = status.last_err || status.error;
        }
    }
    
    calculateDuration() {
        if (!this.currentMigration || !this.currentMigration.timestamp) {
            return null;
        }
        
        const start = new Date(this.currentMigration.timestamp);
        const end = new Date();
        return Math.round((end - start) / 1000); // Duration in seconds
    }
    
    renderDashboard() {
        const dashboardHTML = `
            <div class="migration-dashboard">
                <h2>Migration Dashboard</h2>
                
                ${this.renderCurrentMigration()}
                ${this.renderMigrationHistory()}
                ${this.renderControls()}
            </div>
        `;
        
        document.getElementById('migration-dashboard').innerHTML = dashboardHTML;
    }
    
    renderCurrentMigration() {
        if (!this.currentMigration) {
            return '<div class="no-migration">No active migration</div>';
        }
        
        const status = this.currentMigration;
        const progressBar = `
            <div class="progress-bar">
                <div class="progress-fill" style="width: ${status.progress}%"></div>
            </div>
        `;
        
        return `
            <div class="current-migration">
                <h3>Current Migration</h3>
                <div class="status">Status: ${status.status}</div>
                <div class="step">Step: ${status.step}</div>
                <div class="attempts">Attempts: ${status.try_count}</div>
                ${status.hasError ? `<div class="error">Error: ${status.errorDetails}</div>` : ''}
                <div class="progress">
                    Progress: ${status.progress.toFixed(1)}%
                    ${progressBar}
                </div>
            </div>
        `;
    }
    
    renderMigrationHistory() {
        if (this.migrationHistory.length === 0) {
            return '<div class="no-history">No migration history</div>';
        }
        
        const historyItems = this.migrationHistory.map(migration => `
            <div class="history-item">
                <div class="timestamp">${new Date(migration.completedAt).toLocaleString()}</div>
                <div class="duration">Duration: ${migration.duration}s</div>
                <div class="final-step">Final Step: ${migration.step}</div>
            </div>
        `).join('');
        
        return `
            <div class="migration-history">
                <h3>Migration History</h3>
                ${historyItems}
            </div>
        `;
    }
    
    renderControls() {
        return `
            <div class="dashboard-controls">
                <button onclick="dashboard.refreshStatus()">Refresh Status</button>
                <button onclick="dashboard.exportLogs()">Export Logs</button>
                ${this.currentMigration ? 
                    '<button onclick="dashboard.stopMonitoring()">Stop Monitoring</button>' :
                    '<button onclick="dashboard.startMonitoring()">Start Monitoring</button>'
                }
            </div>
        `;
    }
    
    async refreshStatus() {
        try {
            const status = await this.monitor.checkMigrationStatus();
            this.updateCurrentMigration(status);
            this.renderDashboard();
            this.showNotification('Status refreshed', 'info');
        } catch (error) {
            this.showNotification('Failed to refresh status', 'error');
        }
    }
    
    async startMonitoring() {
        await this.monitor.startMonitoring();
        this.renderDashboard();
    }
    
    stopMonitoring() {
        this.monitor.stopMonitoring();
        this.renderDashboard();
    }
    
    exportLogs() {
        const logs = {
            currentMigration: this.currentMigration,
            history: this.migrationHistory,
            exportedAt: new Date().toISOString()
        };
        
        const blob = new Blob([JSON.stringify(logs, null, 2)], { type: 'application/json' });
        const url = URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        a.download = `migration-logs-${Date.now()}.json`;
        a.click();
        URL.revokeObjectURL(url);
    }
    
    showNotification(message, type) {
        // Implement notification display
        console.log(`[${type.toUpperCase()}] ${message}`);
    }
}

// Initialize dashboard
const dashboard = new MigrationDashboard();
dashboard.startDashboard();

// Automated migration management with retry logic
class MigrationManager {
    constructor() {
        this.maxRetries = 3;
        this.retryDelay = 30000; // 30 seconds
        this.healthCheckInterval = 10000; // 10 seconds
    }
    
    async manageMigration() {
        let retryCount = 0;
        
        while (retryCount < this.maxRetries) {
            try {
                const result = await this.runMigrationWithMonitoring();
                
                if (result.success) {
                    await this.postMigrationTasks(result);
                    return result;
                } else {
                    retryCount++;
                    if (retryCount < this.maxRetries) {
                        console.log(`Migration failed, retrying in ${this.retryDelay/1000} seconds... (${retryCount}/${this.maxRetries})`);
                        await this.delay(this.retryDelay);
                    }
                }
            } catch (error) {
                retryCount++;
                console.error(`Migration attempt ${retryCount} failed:`, error);
                
                if (retryCount < this.maxRetries) {
                    await this.delay(this.retryDelay);
                }
            }
        }
        
        throw new Error(`Migration failed after ${this.maxRetries} attempts`);
    }
    
    async runMigrationWithMonitoring() {
        const monitor = new MigrationMonitor(this.healthCheckInterval);
        
        return new Promise((resolve, reject) => {
            let migrationResult = null;
            
            monitor.onComplete((status) => {
                migrationResult = { success: true, status };
                resolve(migrationResult);
            });
            
            monitor.onError((status) => {
                if (status.try_count >= 3) { // Max retries reached
                    migrationResult = { success: false, status };
                    resolve(migrationResult);
                }
            });
            
            // Start monitoring
            monitor.startMonitoring().catch(reject);
            
            // Set timeout for migration
            setTimeout(() => {
                monitor.stopMonitoring();
                if (!migrationResult) {
                    reject(new Error('Migration timeout'));
                }
            }, 30 * 60 * 1000); // 30 minute timeout
        });
    }
    
    async postMigrationTasks(result) {
        console.log('Running post-migration tasks...');
        
        // Verify migration integrity
        await this.verifyMigrationIntegrity();
        
        // Update system configuration
        await this.updateSystemConfiguration();
        
        // Notify stakeholders
        await this.notifyMigrationComplete(result);
        
        console.log('Post-migration tasks completed');
    }
    
    async verifyMigrationIntegrity() {
        // Implement migration verification logic
        console.log('Verifying migration integrity...');
    }
    
    async updateSystemConfiguration() {
        // Update system configuration after migration
        console.log('Updating system configuration...');
    }
    
    async notifyMigrationComplete(result) {
        // Notify relevant parties about migration completion
        console.log('Notifying migration completion...');
    }
    
    delay(ms) {
        return new Promise(resolve => setTimeout(resolve, ms));
    }
}

// Usage
const migrationManager = new MigrationManager();

try {
    const result = await migrationManager.manageMigration();
    console.log('Migration completed successfully:', result);
} catch (error) {
    console.error('Migration management failed:', error);
}