/**
 * Phoenix Voice Orchestrator Service
 * TTS/STT with caching, multi-provider routing, moderation
 */

import { getDb } from '../../db/index.js'
import { logger } from '../../lib/logger.js'
import crypto from 'crypto'

export interface VoiceSynthesisRequest {
  text: string
  voiceProfile: string
  format: 'mp3' | 'wav' | 'ogg'
  latencyClass: 'LOW' | 'STANDARD' | 'HIGH_QUALITY'
}

export interface VoiceSynthesisResult {
  audioHash: string
  audioUrl: string
  duration: number
  provider: string
  cached: boolean
}

class VoiceOrchestratorService {
  /**
   * Synthesize voice with caching
   */
  async synthesizeVoice(request: VoiceSynthesisRequest): Promise<VoiceSynthesisResult> {
    const db = getDb()
    
    // Generate deterministic cache key
    const cacheKey = this.generateCacheKey(request.text, request.voiceProfile, request.format)
    
    // Check cache
    const cached = await db.query(
      `SELECT * FROM voice_cache WHERE cache_key = $1`,
      [cacheKey]
    )

    if (cached.rows.length > 0) {
      logger.info('Voice synthesis cache hit', { cacheKey })
      return {
        audioHash: cached.rows[0].audio_hash,
        audioUrl: cached.rows[0].audio_url,
        duration: cached.rows[0].duration,
        provider: cached.rows[0].provider,
        cached: true
      }
    }

    // Select provider based on latency class
    const provider = this.selectProvider(request.latencyClass)
    
    // Scrub PII from text
    const scrubbedText = this.scrubPII(request.text)
    
    // Synthesize via provider
    const synthesis = await this.synthesizeViaProvider(provider, {
      ...request,
      text: scrubbedText
    })

    // Store in cache
    await db.query(
      `INSERT INTO voice_cache (cache_key, audio_hash, audio_url, duration, provider, text_hash)
       VALUES ($1, $2, $3, $4, $5, $6)`,
      [cacheKey, synthesis.audioHash, synthesis.audioUrl, synthesis.duration, provider, cacheKey]
    )

    logger.info('Voice synthesized', { cacheKey, provider })
    return {
      ...synthesis,
      provider,
      cached: false
    }
  }

  /**
   * Get cached audio by hash
   */
  async getAudioByHash(hash: string): Promise<VoiceSynthesisResult | null> {
    const db = getDb()
    
    const result = await db.query(
      `SELECT * FROM voice_cache WHERE audio_hash = $1`,
      [hash]
    )

    if (result.rows.length === 0) {
      return null
    }

    const row = result.rows[0]
    return {
      audioHash: row.audio_hash,
      audioUrl: row.audio_url,
      duration: row.duration,
      provider: row.provider,
      cached: true
    }
  }

  private generateCacheKey(text: string, voiceProfile: string, format: string): string {
    const hash = crypto.createHash('sha256')
    hash.update(`${text}:${voiceProfile}:${format}`)
    return hash.digest('hex')
  }

  private scrubPII(text: string): string {
    // Placeholder - would implement actual PII scrubbing
    // Remove emails, phone numbers, SSNs, etc.
    return text
  }

  private selectProvider(latencyClass: string): string {
    const providers: Record<string, string> = {
      LOW: 'elevenlabs',
      STANDARD: 'openai',
      HIGH_QUALITY: 'elevenlabs'
    }
    return providers[latencyClass] || 'elevenlabs'
  }

  private async synthesizeViaProvider(
    provider: string,
    request: VoiceSynthesisRequest
  ): Promise<Omit<VoiceSynthesisResult, 'provider' | 'cached'>> {
    // This would call the appropriate provider adapter
    logger.info('Synthesizing via provider', { provider, request })
    
    // Placeholder - would implement actual provider calls
    return {
      audioHash: crypto.randomBytes(32).toString('hex'),
      audioUrl: `https://cdn.sankofa.nexus/voice/${crypto.randomBytes(16).toString('hex')}.${request.format}`,
      duration: 0
    }
  }
}

export const voiceOrchestratorService = new VoiceOrchestratorService()
