/**
 * Utility CLI Commands - TypeScript Implementation
 * 
 * Database maintenance, statistics, and benchmarking
 */

import chalk from 'chalk'
import ora from 'ora'
import Table from 'cli-table3'
import { Brainy } from '../../brainyData.js'

interface UtilityOptions {
  verbose?: boolean
  json?: boolean
  pretty?: boolean
}

interface StatsOptions extends UtilityOptions {
  byService?: boolean
  detailed?: boolean
}

interface CleanOptions extends UtilityOptions {
  removeOrphans?: boolean
  rebuildIndex?: boolean
}

interface BenchmarkOptions extends UtilityOptions {
  operations?: string
  iterations?: string
}

let brainyInstance: Brainy | null = null

const getBrainy = async (): Promise<Brainy> => {
  if (!brainyInstance) {
    brainyInstance = new Brainy()
    await brainyInstance.init()
  }
  return brainyInstance
}

const formatBytes = (bytes: number): string => {
  if (bytes === 0) return '0 B'
  const k = 1024
  const sizes = ['B', 'KB', 'MB', 'GB']
  const i = Math.floor(Math.log(bytes) / Math.log(k))
  return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i]
}

const formatOutput = (data: any, options: UtilityOptions): void => {
  if (options.json) {
    console.log(options.pretty ? JSON.stringify(data, null, 2) : JSON.stringify(data))
  }
}

export const utilityCommands = {
  /**
   * Show database statistics
   */
  async stats(options: StatsOptions) {
    const spinner = ora('Gathering statistics...').start()
    
    try {
      const brain = await getBrainy()
      const stats = await brain.getStatistics()
      const memUsage = process.memoryUsage()
      
      spinner.succeed('Statistics gathered')
      
      if (options.json) {
        formatOutput(stats, options)
        return
      }
      
      console.log(chalk.cyan('\n📊 Database Statistics\n'))
      
      // Core stats table
      const coreTable = new Table({
        head: [chalk.cyan('Metric'), chalk.cyan('Value')],
        style: { head: [], border: [] }
      })
      
      coreTable.push(
        ['Total Items', chalk.green(stats.nounCount + stats.verbCount + stats.metadataCount || 0)],
        ['Nouns', chalk.green(stats.nounCount || 0)],
        ['Verbs (Relationships)', chalk.green(stats.verbCount || 0)],
        ['Metadata Records', chalk.green(stats.metadataCount || 0)]
      )
      
      console.log(coreTable.toString())
      
      // Service breakdown if available
      if (options.byService && stats.serviceBreakdown) {
        console.log(chalk.cyan('\n🔧 Service Breakdown\n'))
        
        const serviceTable = new Table({
          head: [chalk.cyan('Service'), chalk.cyan('Nouns'), chalk.cyan('Verbs'), chalk.cyan('Metadata')],
          style: { head: [], border: [] }
        })
        
        Object.entries(stats.serviceBreakdown).forEach(([service, serviceStats]: [string, any]) => {
          serviceTable.push([
            service,
            serviceStats.nounCount || 0,
            serviceStats.verbCount || 0,
            serviceStats.metadataCount || 0
          ])
        })
        
        console.log(serviceTable.toString())
      }
      
      // Storage info
      if (stats.storage) {
        console.log(chalk.cyan('\n💾 Storage\n'))
        
        const storageTable = new Table({
          head: [chalk.cyan('Property'), chalk.cyan('Value')],
          style: { head: [], border: [] }
        })
        
        storageTable.push(
          ['Type', stats.storage.type || 'Unknown'],
          ['Size', stats.storage.size ? formatBytes(stats.storage.size) : 'N/A'],
          ['Location', stats.storage.location || 'N/A']
        )
        
        console.log(storageTable.toString())
      }
      
      // Performance metrics
      if (stats.performance && options.detailed) {
        console.log(chalk.cyan('\n⚡ Performance\n'))
        
        const perfTable = new Table({
          head: [chalk.cyan('Metric'), chalk.cyan('Value')],
          style: { head: [], border: [] }
        })
        
        if (stats.performance.avgQueryTime) {
          perfTable.push(['Avg Query Time', `${stats.performance.avgQueryTime.toFixed(2)} ms`])
        }
        if (stats.performance.totalQueries) {
          perfTable.push(['Total Queries', stats.performance.totalQueries])
        }
        if (stats.performance.cacheHitRate) {
          perfTable.push(['Cache Hit Rate', `${(stats.performance.cacheHitRate * 100).toFixed(1)}%`])
        }
        
        console.log(perfTable.toString())
      }
      
      // Memory usage
      console.log(chalk.cyan('\n🧠 Memory Usage\n'))
      
      const memTable = new Table({
        head: [chalk.cyan('Type'), chalk.cyan('Size')],
        style: { head: [], border: [] }
      })
      
      memTable.push(
        ['Heap Used', formatBytes(memUsage.heapUsed)],
        ['Heap Total', formatBytes(memUsage.heapTotal)],
        ['RSS', formatBytes(memUsage.rss)],
        ['External', formatBytes(memUsage.external)]
      )
      
      console.log(memTable.toString())
      
      // Index info
      if (stats.index && options.detailed) {
        console.log(chalk.cyan('\n🎯 Vector Index\n'))
        
        const indexTable = new Table({
          head: [chalk.cyan('Property'), chalk.cyan('Value')],
          style: { head: [], border: [] }
        })
        
        indexTable.push(
          ['Dimensions', stats.index.dimensions || 'N/A'],
          ['Indexed Vectors', stats.index.vectorCount || 0],
          ['Index Size', stats.index.indexSize ? formatBytes(stats.index.indexSize) : 'N/A']
        )
        
        console.log(indexTable.toString())
      }
      
    } catch (error: any) {
      spinner.fail('Failed to gather statistics')
      console.error(chalk.red(error.message))
      process.exit(1)
    }
  },

  /**
   * Clean and optimize database
   */
  async clean(options: CleanOptions) {
    const spinner = ora('Cleaning database...').start()
    
    try {
      const brain = await getBrainy()
      const tasks: string[] = []
      
      if (options.removeOrphans) {
        spinner.text = 'Removing orphaned items...'
        tasks.push('Removed orphaned items')
        // Implementation would go here
        await new Promise(resolve => setTimeout(resolve, 500)) // Simulate work
      }
      
      if (options.rebuildIndex) {
        spinner.text = 'Rebuilding search index...'
        tasks.push('Rebuilt search index')
        // Implementation would go here
        await new Promise(resolve => setTimeout(resolve, 1000)) // Simulate work
      }
      
      if (tasks.length === 0) {
        spinner.text = 'Running general cleanup...'
        tasks.push('General cleanup completed')
        // Run general cleanup tasks
        await new Promise(resolve => setTimeout(resolve, 500)) // Simulate work
      }
      
      spinner.succeed('Database cleaned')
      
      if (!options.json) {
        console.log(chalk.green('\n✓ Cleanup completed:'))
        tasks.forEach(task => {
          console.log(chalk.dim(`  • ${task}`))
        })
        
        // Get new stats
        const stats = await brain.getStatistics()
        console.log(chalk.cyan('\nDatabase Status:'))
        console.log(`  Total items: ${stats.nounCount + stats.verbCount}`)
        console.log(`  Index status: ${chalk.green('Healthy')}`)
      } else {
        formatOutput({ tasks, success: true }, options)
      }
    } catch (error: any) {
      spinner.fail('Cleanup failed')
      console.error(chalk.red(error.message))
      process.exit(1)
    }
  },

  /**
   * Run performance benchmarks
   */
  async benchmark(options: BenchmarkOptions) {
    const operations = options.operations || 'all'
    const iterations = parseInt(options.iterations || '100')
    
    console.log(chalk.cyan(`\n🚀 Running Benchmarks (${iterations} iterations)\n`))
    
    const results: any = {
      operations: {},
      summary: {}
    }
    
    try {
      const brain = await getBrainy()
      
      // Benchmark different operations
      const benchmarks = [
        { name: 'add', enabled: operations === 'all' || operations.includes('add') },
        { name: 'search', enabled: operations === 'all' || operations.includes('search') },
        { name: 'similarity', enabled: operations === 'all' || operations.includes('similarity') },
        { name: 'cluster', enabled: operations === 'all' || operations.includes('cluster') }
      ]
      
      for (const bench of benchmarks) {
        if (!bench.enabled) continue
        
        const spinner = ora(`Benchmarking ${bench.name}...`).start()
        const times: number[] = []
        
        for (let i = 0; i < iterations; i++) {
          const start = Date.now()
          
          switch (bench.name) {
            case 'add':
              await brain.add(`Test item ${i}`, { benchmark: true })
              break
            case 'search':
              await brain.search('test', 10)
              break
            case 'similarity':
              const neural = brain.neural
              await neural.similar('test1', 'test2')
              break
            case 'cluster':
              const neuralApi = brain.neural
              await neuralApi.clusters()
              break
          }
          
          times.push(Date.now() - start)
        }
        
        // Calculate statistics
        const avg = times.reduce((a, b) => a + b, 0) / times.length
        const min = Math.min(...times)
        const max = Math.max(...times)
        const median = times.sort((a, b) => a - b)[Math.floor(times.length / 2)]
        
        results.operations[bench.name] = {
          avg: avg.toFixed(2),
          min,
          max,
          median,
          ops: (1000 / avg).toFixed(2)
        }
        
        spinner.succeed(`${bench.name}: ${avg.toFixed(2)}ms avg (${(1000 / avg).toFixed(2)} ops/sec)`)
      }
      
      // Calculate summary
      const totalOps = Object.values(results.operations).reduce((sum: number, op: any) => 
        sum + parseFloat(op.ops), 0)
      
      results.summary = {
        totalOperations: Object.keys(results.operations).length,
        averageOpsPerSec: (totalOps / Object.keys(results.operations).length).toFixed(2)
      }
      
      if (!options.json) {
        // Display results table
        console.log(chalk.cyan('\n📊 Benchmark Results\n'))
        
        const table = new Table({
          head: [
            chalk.cyan('Operation'),
            chalk.cyan('Avg (ms)'),
            chalk.cyan('Min (ms)'),
            chalk.cyan('Max (ms)'),
            chalk.cyan('Median (ms)'),
            chalk.cyan('Ops/sec')
          ],
          style: { head: [], border: [] }
        })
        
        Object.entries(results.operations).forEach(([op, stats]: [string, any]) => {
          table.push([
            op,
            stats.avg,
            stats.min,
            stats.max,
            stats.median,
            chalk.green(stats.ops)
          ])
        })
        
        console.log(table.toString())
        
        console.log(chalk.cyan('\n📈 Summary'))
        console.log(`  Operations tested: ${results.summary.totalOperations}`)
        console.log(`  Average throughput: ${chalk.green(results.summary.averageOpsPerSec)} ops/sec`)
      } else {
        formatOutput(results, options)
      }
      
    } catch (error: any) {
      console.error(chalk.red('Benchmark failed:'), error.message)
      process.exit(1)
    }
  }
}