Music Therapy and Wellness Apps

class AdaptiveMusicEngine {
  constructor(
    private emotionDetector: EmotionDetectionAPI,
    private musicGenerator: MusicGeneratorAPI,
    private biometricSensors: BiometricAPI
  ) {}

  async generateTherapeuticSession(
    user: User, 
    therapeuticGoal: TherapeuticGoal
  ): Promise<MusicSession> {
    
    // Assess current user state
    const currentEmotion = await this.emotionDetector.analyzeVoice(user.voiceSample);
    const biometrics = await this.biometricSensors.getCurrentReadings(user.id);
    const userHistory = await this.getUserMusicHistory(user.id);

    // Determine optimal musical parameters
    const musicParameters = this.calculateOptimalParameters({
      currentEmotion,
      biometrics,
      therapeuticGoal,
      userHistory,
      culturalPreferences: user.culturalBackground
    });

    // Generate or select appropriate music
    const musicSession = await this.musicGenerator.create({
      tempo: musicParameters.tempo, // BPM matched to heart rate
      key: musicParameters.key, // Major for uplifting, minor for processing
      rhythm: musicParameters.rhythm, // Steady for anxiety, varied for engagement
      instruments: musicParameters.instruments, // Cultural relevance
      duration: therapeuticGoal.sessionLength,
      progression: this.createEmotionalJourney(therapeuticGoal)
    });

    return {
      session: musicSession,
      adaptationTriggers: this.setupRealTimeAdaptation(user.id),
      outcomeMetrics: this.defineSuccessMetrics(therapeuticGoal)
    };
  }

  private calculateOptimalParameters(state: UserState): MusicParameters {
    // Evidence-based parameter selection
    if (state.currentEmotion.anxiety > 0.7) {
      return {
        tempo: Math.max(60, state.biometrics.heartRate - 20), // Slow down
        key: 'C_major', // Stable, calming
        rhythm: 'steady_4_4', // Predictable pattern
        instruments: ['piano', 'strings', 'nature_sounds']
      };
    } else if (state.currentEmotion.depression > 0.6) {
      return {
        tempo: Math.min(120, state.biometrics.heartRate + 10), // Gentle uplift
        key: 'G_major', // Bright but not overwhelming
        rhythm: 'gentle_swing', // Subtle movement
        instruments: ['guitar', 'flute', 'light_percussion']
      };
    }
    // Additional conditions...
  }
}

class BiometricMusicAdapter {
  private heartRateThresholds = {
    relaxed: { min: 60, max: 80 },
    active: { min: 80, max: 120 },
    stressed: { min: 120, max: 160 }
  };

  async adaptMusicToPhysiology(
    currentMusic: MusicStream,
    biometrics: BiometricReading
  ): Promise<MusicAdjustment> {
    
    const heartRateZone = this.getHeartRateZone(biometrics.heartRate);
    const stressLevel = this.calculateStressLevel(biometrics);
    const breathing = this.analyzeBreathingPattern(biometrics.respiratoryRate);

    if (stressLevel > 0.8 && heartRateZone === 'stressed') {
      // Immediate calming intervention
      return {
        adjustment: 'immediate_calm',
        parameters: {
          tempo: this.graduallyDecrease(currentMusic.tempo, 60, 30), // 30-second transition
          volume: this.fadeIn('nature_sounds', 0.3),
          harmonics: 'add_low_frequency_drones' // Calming bass frequencies
        }
      };
    }

    if (breathing.pattern === 'shallow' || breathing.pattern === 'rapid') {
      // Guide breathing with musical rhythm
      return {
        adjustment: 'breathing_guide',
        parameters: {
          rhythm: this.createBreathingRhythm(4, 6), // 4 count in, 6 count out
          emphasis: 'rhythmic_breathing_cues',
          visualization: 'breathing_circle_animation'
        }
      };
    }

    return null; // No adjustment needed
  }

  private createBreathingRhythm(inhaleBeats: number, exhaleBeats: number): RhythmPattern {
    return {
      pattern: `${inhaleBeats}:${exhaleBeats}`,
      tempo: 60, // 1 beat per second for easy following
      sounds: {
        inhale: 'gentle_chime_up',
        exhale: 'soft_release_down',
        hold: 'sustained_tone'
      },
      visualCues: {
        inhale: { type: 'expand', color: 'blue', duration: inhaleBeats },
        exhale: { type: 'contract', color: 'green', duration: exhaleBeats }
      }
    };
  }
}

class CulturalMusicTherapy {
  private culturalMusicDatabase: Map<string, CulturalMusicProfile> = new Map();

  constructor() {
    this.initializeCulturalDatabase();
  }

  async createCulturallyRelevantSession(
    user: User,
    therapeuticGoal: TherapeuticGoal
  ): Promise<CulturalMusicSession> {
    
    const culturalProfile = this.culturalMusicDatabase.get(user.culturalBackground);
    const traditionalInstruments = culturalProfile.healingInstruments;
    const therapeuticScales = culturalProfile.emotionalScales;

    // Example: Indian Classical Music Therapy
    if (user.culturalBackground === 'indian_classical') {
      return this.createRagaBasedTherapy(user, therapeuticGoal);
    }

    // Example: West African Music Therapy
    if (user.culturalBackground === 'west_african') {
      return this.createPolyrhythmicTherapy(user, therapeuticGoal);
    }

    // Example: Native American Music Therapy
    if (user.culturalBackground === 'native_american') {
      return this.createSpiritualDrummingTherapy(user, therapeuticGoal);
    }

    return this.createUniversalMusicTherapy(user, therapeuticGoal);
  }

  private async createRagaBasedTherapy(
    user: User, 
    goal: TherapeuticGoal
  ): Promise<CulturalMusicSession> {
    
    // Select appropriate raga based on time and therapeutic need
    const currentTime = new Date().getHours();
    const appropriateRaga = this.selectRagaForTimeAndMood(currentTime, goal.targetEmotion);

    return {
      musicStyle: 'indian_classical',
      raga: appropriateRaga,
      instruments: ['sitar', 'tabla', 'tanpura', 'flute'],
      structure: {
        alap: { duration: '5min', purpose: 'emotional_preparation' },
        jor: { duration: '10min', purpose: 'rhythmic_engagement' },
        jhala: { duration: '10min', purpose: 'therapeutic_peak' },
        conclusion: { duration: '5min', purpose: 'integration' }
      },
      adaptiveElements: {
        tempo: 'user_heart_rate_synchronized',
        improvisation: 'ai_generated_variations',
        microtones: 'emotion_based_adjustments'
      }
    };
  }

  private selectRagaForTimeAndMood(hour: number, targetEmotion: string): string {
    // Traditional time-raga associations for therapeutic purposes
    const timeBasedRagas = {
      morning: ['bhairav', 'todi', 'asavari'], // Contemplative, grounding
      afternoon: ['sarang', 'malkauns', 'bageshri'], // Balanced, stable
      evening: ['yaman', 'kafi', 'bhimpalasi'], // Uplifting, social
      night: ['darbari', 'malkauns', 'bageshri'] // Calming, introspective
    };

    const emotionalRagas = {
      anxiety: ['malkauns', 'darbari', 'todi'], // Deep, stable ragas
      depression: ['yaman', 'sarang', 'bhairav'], // Uplifting ragas
      anger: ['kafi', 'bageshri', 'asavari'], // Cooling ragas
      grief: ['todi', 'malkauns', 'bhimpalasi'] // Processing ragas
    };

    // Find intersection of time-appropriate and emotion-appropriate ragas
    const timeCategory = this.getTimeCategory(hour);
    const timeRagas = timeBasedRagas[timeCategory];
    const emotionRagas = emotionalRagas[targetEmotion] || [];

    const intersection = timeRagas.filter(raga => emotionRagas.includes(raga));
    return intersection.length > 0 ? intersection[0] : timeRagas[0];
  }
}

class AccessibleMusicTherapy {
  
  async createHapticMusicExperience(
    audioTrack: AudioTrack,
    user: User
  ): Promise<HapticMusicSession> {
    
    const audioAnalysis = await this.analyzeAudioFrequencies(audioTrack);
    const hapticMapping = this.createHapticMapping(audioAnalysis, user.sensitivityProfile);

    return {
      hapticPatterns: {
        bass: this.createLowFrequencyVibration(audioAnalysis.bassLine),
        melody: this.createMelodyVibration(audioAnalysis.melody),
        rhythm: this.createRhythmicPulses(audioAnalysis.percussion),
        harmony: this.createHarmonicTextures(audioAnalysis.chords)
      },
      visualizations: {
        waveform: this.createRealTimeWaveform(audioTrack),
        colorTherapy: this.mapFrequenciesToColors(audioAnalysis),
        particleSystem: this.createMusicParticles(audioAnalysis)
      },
      adaptiveFeatures: {
        intensityControl: 'user_preference_based',
        patternComplexity: 'cognitive_load_aware',
        sessionLength: 'attention_span_adaptive'
      }
    };
  }

  private createLowFrequencyVibration(bassLine: FrequencyData): HapticPattern {
    return {
      type: 'sustained_vibration',
      frequency: bassLine.fundamentalFrequency,
      intensity: this.mapAmplitudeToIntensity(bassLine.amplitude),
      pattern: 'continuous_with_peaks',
      bodyMapping: ['lower_back', 'chest', 'wrists'], // Deep, grounding sensation
      therapeuticPurpose: 'emotional_grounding'
    };
  }

  private createMelodyVibration(melody: FrequencyData): HapticPattern {
    return {
      type: 'discrete_pulses',
      frequency: melody.pitchContour.map(pitch => this.pitchToHapticFreq(pitch)),
      pattern: melody.rhythmicPattern,
      bodyMapping: ['fingertips', 'temples', 'collar_bone'], // Light, flowing
      therapeuticPurpose: 'emotional_expression'
    };
  }

  // Sign Language Integration for Deaf Community
  async generateSignLanguageInterpretation(
    lyrics: string,
    emotionalContext: EmotionalContext
  ): Promise<SignLanguageSession> {
    
    const signTranslation = await this.translateToSignLanguage(lyrics);
    const emotionalSigning = this.addEmotionalExpression(signTranslation, emotionalContext);

    return {
      signSequence: emotionalSigning,
      avatar: this.create3DSigningAvatar(),
      culturalAdaptation: this.adaptToLocalSignLanguage(user.region),
      interactiveElements: {
        practiceSigning: true,
        emotionExpression: true,
        communitySharing: true
      }
    };
  }
}

class AnxietyMusicTherapy {
  
  async createAnxietyReliefSession(user: User): Promise<TherapeuticSession> {
    return {
      phase1: {
        name: 'Recognition',
        duration: '3min',
        music: await this.generateValidationMusic(user.currentState),
        interaction: 'breathing_synchronization',
        biometricGoals: { heartRate: 'acknowledge_current', breathing: 'steady' }
      },
      
      phase2: {
        name: 'Regulation',
        duration: '7min',
        music: await this.generateCalmingProgression(user.baselineState),
        interaction: 'progressive_muscle_relaxation',
        biometricGoals: { heartRate: 'decrease_10bpm', breathing: 'deepen' }
      },
      
      phase3: {
        name: 'Resilience',
        duration: '5min',
        music: await this.generateEmpowermentMusic(user.strengths),
        interaction: 'positive_affirmations',
        biometricGoals: { heartRate: 'stable_optimal', confidence: 'increase' }
      }
    };
  }

  private async generateValidationMusic(currentState: EmotionalState): Promise<AudioTrack> {
    // Music that matches current emotional state (not immediately trying to change it)
    return {
      tempo: currentState.perceivedTempo, // Match their internal rhythm
      dynamics: 'gentle_acknowledgment',
      harmony: 'unresolved_to_resolved', // Musical representation of processing
      instruments: ['piano', 'cello', 'subtle_pad'],
      emotionalArc: 'validation_to_hope'
    };
  }
}

class DepressionMusicTherapy {
  
  async createDepressionSupportSession(
    user: User, 
    severity: DepressionSeverity
  ): Promise<TherapeuticSession> {
    
    // Gentle approach - meet the user where they are emotionally
    if (severity === 'severe') {
      return this.createMinimalEngagementSession(user);
    }
    
    if (severity === 'moderate') {
      return this.createGradualActivationSession(user);
    }
    
    return this.createMoodElevationSession(user);
  }

  private async createGradualActivationSession(user: User): Promise<TherapeuticSession> {
    return {
      warmup: {
        duration: '2min',
        music: this.generateMinorToMajorProgression(),
        purpose: 'gentle_mood_lift',
        userAction: 'passive_listening'
      },
      
      engagement: {
        duration: '8min',
        music: this.generateInteractiveRhythmSection(),
        purpose: 'behavioral_activation',
        userAction: 'simple_tapping_or_humming'
      },
      
      reinforcement: {
        duration: '5min',
        music: this.generatePositiveAssociationMusic(user.personalMemories),
        purpose: 'memory_enhancement',
        userAction: 'guided_positive_recall'
      }
    };
  }

  private generateInteractiveRhythmSection(): InteractiveMusicSection {
    return {
      baseRhythm: 'simple_4_4_beat',
      tempo: 80, // Moderately encouraging
      userParticipation: {
        level1: 'tap_on_beat',
        level2: 'tap_simple_pattern',
        level3: 'create_counter_rhythm',
        level4: 'add_vocal_sounds'
      },
      adaptiveComplexity: 'success_based_progression',
      encouragementSystem: 'immediate_musical_feedback'
    };
  }
}

class GlobalMusicTherapyPlatform {
  
  async deployRegionalVariant(
    region: string,
    population: PopulationProfile
  ): Promise<RegionalDeployment> {
    
    const culturalAdaptation = await this.researchLocalMusicTraditions(region);
    const therapeuticProtocols = await this.validateWithLocalHealthcareProviders(region);
    const accessibilityRequirements = await this.assessLocalDisabilityCommunity(region);

    return {
      musicLibrary: culturalAdaptation.traditionalHealingMusic,
      therapeuticProtocols: this.adaptProtocolsToLocalPractices(therapeuticProtocols),
      languageSupport: culturalAdaptation.supportedLanguages,
      accessibilityFeatures: {
        haptic: accessibilityRequirements.hapticNeeds,
        visual: accessibilityRequirements.visualImpairmentSupport,
        cognitive: accessibilityRequirements.cognitiveAdaptations
      },
      partnerships: {
        localHealthcare: therapeuticProtocols.providerNetwork,
        culturalInstitutions: culturalAdaptation.musicianPartnerships,
        disabilityOrganizations: accessibilityRequirements.advocacyGroups
      }
    };
  }
}