Cost Optimization

// Cost analysis configuration
const costAnalysis = {
  // Resource categories
  categories: {
    compute: ['instances', 'containers', 'functions'],
    storage: ['object', 'block', 'file'],
    database: ['sql', 'nosql', 'cache'],
    network: ['bandwidth', 'load_balancers', 'vpn'],
    other: ['monitoring', 'security', 'support']
  },

  // Time periods
  periods: {
    daily: { days: 1, granularity: 'hour' },
    weekly: { days: 7, granularity: 'day' },
    monthly: { days: 30, granularity: 'day' },
    quarterly: { days: 90, granularity: 'week' }
  },

  async analyzeCosts(period = 'monthly') {
    const timeframe = this.periods[period];
    const now = new Date();
    const startDate = new Date(now.getTime() - (timeframe.days * 86400000));
    
    const costs = await this.fetchCostData(startDate, now, timeframe.granularity);
    
    return {
      summary: this.summarizeCosts(costs),
      byService: this.groupByService(costs),
      byCategory: this.groupByCategory(costs),
      trend: this.analyzeTrend(costs),
      anomalies: this.detectAnomalies(costs)
    };
  },

  summarizeCosts(costs) {
    return {
      total: costs.reduce((sum, item) => sum + item.cost, 0),
      average: costs.reduce((sum, item) => sum + item.cost, 0) / costs.length,
      min: Math.min(...costs.map(item => item.cost)),
      max: Math.max(...costs.map(item => item.cost))
    };
  }
}

// Resource optimization
const resourceOptimizer = {
  // Optimization strategies
  strategies: {
    rightSizing: {
      description: 'Adjust resource capacity to match actual usage',
      applicableTo: ['compute', 'database'],
      potentialSavings: 'high'
    },
    scheduling: {
      description: 'Automatically start/stop resources based on schedule',
      applicableTo: ['compute', 'database'],
      potentialSavings: 'medium'
    },
    autoscaling: {
      description: 'Dynamically adjust resources based on demand',
      applicableTo: ['compute'],
      potentialSavings: 'high'
    },
    storageLifecycle: {
      description: 'Automatically transition data to lower-cost storage tiers',
      applicableTo: ['storage'],
      potentialSavings: 'medium'
    },
    reservedCapacity: {
      description: 'Commit to longer-term usage for discounted rates',
      applicableTo: ['compute', 'database', 'storage'],
      potentialSavings: 'high'
    }
  },

  async optimizeCompute() {
    const instances = await this.getComputeInstances();
    const recommendations = [];
    
    for (const instance of instances) {
      const usage = await this.getResourceUtilization(instance.id);
      
      if (this.isUnderutilized(usage)) {
        recommendations.push({
          resourceId: instance.id,
          resourceType: instance.type,
          currentSize: instance.size,
          recommendedSize: this.recommendSize(instance, usage),
          strategy: 'rightSizing',
          estimatedSavings: this.calculateSavings(instance, usage)
        });
      }
      
      if (this.hasUsagePattern(usage)) {
        recommendations.push({
          resourceId: instance.id,
          resourceType: instance.type,
          strategy: 'scheduling',
          schedule: this.recommendSchedule(usage),
          estimatedSavings: this.calculateSchedulingSavings(instance, usage)
        });
      }
    }
    
    return recommendations;
  }
}

// Cost governance system
const costGovernance = {
  // Budget configuration
  budgets: {
    async createBudget(config) {
      const budget = {
        id: this.generateId(),
        name: config.name,
        amount: config.amount,
        period: config.period || 'monthly',
        scope: config.scope || 'all',
        filters: config.filters || {},
        alerts: config.alerts || [
          { threshold: 80, type: 'percentage' },
          { threshold: 100, type: 'percentage' }
        ],
        created: new Date()
      };
      
      await this.saveBudget(budget);
      await this.setupBudgetAlerts(budget);
      
      return budget;
    }
  },
  
  // Policy enforcement
  policies: {
    async createPolicy(config) {
      const policy = {
        id: this.generateId(),
        name: config.name,
        description: config.description,
        scope: config.scope,
        rules: config.rules,
        actions: config.actions,
        enabled: config.enabled !== false,
        created: new Date()
      };
      
      await this.savePolicy(policy);
      
      if (policy.enabled) {
        await this.enforcePolicy(policy);
      }
      
      return policy;
    },
    
    async enforcePolicy(policy) {
      const resources = await this.getResourcesInScope(policy.scope);
      const violations = [];
      
      for (const resource of resources) {
        for (const rule of policy.rules) {
          if (!this.isCompliant(resource, rule)) {
            violations.push({
              policyId: policy.id,
              resourceId: resource.id,
              rule: rule.id,
              details: this.getViolationDetails(resource, rule)
            });
            
            if (policy.actions.includes('notify')) {
              await this.sendPolicyNotification(policy, resource, rule);
            }
            
            if (policy.actions.includes('tag')) {
              await this.tagResource(resource.id, {
                'policy-violation': 'true',
                'violation-rule': rule.id
              });
            }
            
            if (policy.actions.includes('remediate')) {
              await this.remediateViolation(resource, rule);
            }
          }
        }
      }
      
      return violations;
    }
  }
}

// Cost monitoring system
const costMonitoring = {
  // Monitoring configuration
  config: {
    metrics: [
      { name: 'total_cost', period: 'daily' },
      { name: 'cost_by_service', period: 'daily' },
      { name: 'cost_by_tag', period: 'daily' },
      { name: 'budget_vs_actual', period: 'daily' },
      { name: 'forecast', period: 'monthly' }
    ],
    
    thresholds: {
      budget_percentage: [80, 100],
      daily_increase: 20, // percentage
      unusual_activity: 2 // standard deviations
    }
  },
  
  // Alert configuration
  alerts: {
    channels: ['email', 'slack', 'webhook'],
    
    templates: {
      budget_threshold: {
        subject: 'Budget Alert: {budget_name} at {percentage}%',
        body: 'Your budget {budget_name} has reached {percentage}% of the allocated amount. Current spend: {current_amount} of {budget_amount}.'
      },
      
      unusual_activity: {
        subject: 'Cost Anomaly Detected: {service_name}',
        body: 'Unusual spending detected for {service_name}. Current cost: {current_cost}, Expected range: {expected_min} - {expected_max}.'
      }
    },
    
    async createAlert(type, data) {
      const template = this.templates[type];
      
      if (!template) {
        throw new Error(`Unknown alert type: ${type}`);
      }
      
      const alert = {
        id: this.generateId(),
        type,
        timestamp: new Date(),
        subject: this.formatTemplate(template.subject, data),
        body: this.formatTemplate(template.body, data),
        data
      };
      
      await this.sendAlert(alert);
      await this.saveAlert(alert);
      
      return alert;
    }
  }
}