/**
 * Lyria Music Composer with Advanced MIDI Support
 *
 * AI-powered music composition engine with real-time MIDI generation,
 * advanced musical theory integration, and multi-instrument orchestration.
 */

import { EventEmitter } from "events";
import { Logger } from "../../utils/logger.js";
import {
  MusicCompositionConfig,
  MIDIConfig,
  ServiceResponse,
  ServiceError,
  PerformanceMetrics,
} from "./interfaces.js";

export interface LyriaConfig {
  composition: CompositionEngineConfig;
  midi: MIDIEngineConfig;
  orchestration: OrchestrationConfig;
  theory: MusicTheoryConfig;
  generation: GenerationConfig;
}

export interface CompositionEngineConfig {
  ai: CompositionAIConfig;
  constraints: CompositionConstraints;
  styles: StyleDatabase;
  templates: TemplateLibrary;
}

export interface CompositionAIConfig {
  model: string;
  creativity: number; // 0-1
  coherence: number; // 0-1
  complexity: number; // 0-1
  learning: LearningConfig;
}

export interface LearningConfig {
  userPreferences: boolean;
  styleMimicry: boolean;
  patternRecognition: boolean;
  adaptiveGeneration: boolean;
}

export interface CompositionConstraints {
  harmonic: HarmonicConstraints;
  melodic: MelodicConstraints;
  rhythmic: RhythmicConstraints;
  structural: StructuralConstraints;
}

export interface HarmonicConstraints {
  allowedChords: ChordType[];
  progressions: ChordProgression[];
  voiceLeading: VoiceLeadingRules;
  dissonance: DissonanceRules;
}

export interface ChordType {
  name: string;
  intervals: number[];
  tensions: number[];
  inversions: boolean;
}

export interface ChordProgression {
  name: string;
  chords: string[];
  probability: number;
  style: string;
}

export interface VoiceLeadingRules {
  maxInterval: number;
  preferredMotion: "step" | "skip" | "leap" | "any";
  parallelFifths: boolean;
  parallelOctaves: boolean;
  resolution: ResolutionRules;
}

export interface ResolutionRules {
  leadingTone: boolean;
  sevenths: boolean;
  suspensions: boolean;
}

export interface DissonanceRules {
  preparation: boolean;
  resolution: boolean;
  maxDissonance: number;
  context: "strict" | "moderate" | "free";
}

export interface MelodicConstraints {
  range: [number, number]; // MIDI note numbers
  intervals: IntervalConstraints;
  phrases: PhraseConstraints;
  contour: ContourConstraints;
}

export interface IntervalConstraints {
  maxInterval: number;
  preferredIntervals: number[];
  bannedIntervals: number[];
  resolution: boolean;
}

export interface PhraseConstraints {
  minLength: number;
  maxLength: number;
  breathMarks: boolean;
  cadences: CadenceType[];
}

export interface CadenceType {
  name: string;
  chords: string[];
  strength: number;
}

export interface ContourConstraints {
  direction: "ascending" | "descending" | "arch" | "valley" | "any";
  climax: boolean;
  repetition: RepetitionRules;
}

export interface RepetitionRules {
  exact: boolean;
  sequential: boolean;
  motivic: boolean;
  maxRepeats: number;
}

export interface RhythmicConstraints {
  timeSignatures: TimeSignature[];
  syncopation: SyncopationRules;
  subdivision: SubdivisionRules;
  accents: AccentRules;
}

export interface TimeSignature {
  numerator: number;
  denominator: number;
  feel: "simple" | "compound" | "complex";
}

export interface SyncopationRules {
  allowed: boolean;
  probability: number;
  types: SyncopationType[];
}

export interface SyncopationType {
  name: string;
  pattern: number[];
  strength: number;
}

export interface SubdivisionRules {
  allowed: number[];
  probability: Record<number, number>;
  nesting: boolean;
}

export interface AccentRules {
  metric: boolean;
  agogic: boolean;
  dynamic: boolean;
  patterns: AccentPattern[];
}

export interface AccentPattern {
  name: string;
  pattern: number[];
  style: string;
}

export interface StructuralConstraints {
  forms: MusicalForm[];
  sections: SectionConstraints;
  transitions: TransitionRules;
  unity: UnityRules;
}

export interface MusicalForm {
  name: string;
  sections: FormSection[];
  repeats: RepeatStructure[];
}

export interface FormSection {
  name: string;
  proportion: number;
  character: string;
  keyRelation: string;
}

export interface RepeatStructure {
  section: string;
  times: number;
  variations: boolean;
}

export interface SectionConstraints {
  minDuration: number;
  maxDuration: number;
  contrast: ContrastRules;
  development: DevelopmentRules;
}

export interface ContrastRules {
  required: boolean;
  types: ContrastType[];
  intensity: number;
}

export interface ContrastType {
  name: string;
  parameters: string[];
  weight: number;
}

export interface DevelopmentRules {
  motivic: boolean;
  harmonic: boolean;
  rhythmic: boolean;
  textural: boolean;
}

export interface TransitionRules {
  smoothness: number;
  techniques: TransitionTechnique[];
  duration: [number, number];
}

export interface TransitionTechnique {
  name: string;
  complexity: number;
  effectiveness: number;
}

export interface UnityRules {
  thematic: boolean;
  motivic: boolean;
  harmonic: boolean;
  tonal: boolean;
}

export interface StyleDatabase {
  genres: Genre[];
  periods: Period[];
  composers: ComposerStyle[];
  regional: RegionalStyle[];
}

export interface Genre {
  name: string;
  characteristics: StyleCharacteristics;
  instruments: InstrumentRole[];
  forms: string[];
}

export interface StyleCharacteristics {
  harmonic: HarmonicStyle;
  melodic: MelodicStyle;
  rhythmic: RhythmicStyle;
  textural: TexturalStyle;
}

export interface HarmonicStyle {
  complexity: number;
  chromaticism: number;
  dissonance: number;
  progressions: string[];
}

export interface MelodicStyle {
  range: [number, number];
  intervals: IntervalUsage[];
  ornamentation: OrnamentationType[];
}

export interface IntervalUsage {
  interval: number;
  frequency: number;
  context: string[];
}

export interface OrnamentationType {
  name: string;
  symbol: string;
  application: string[];
}

export interface RhythmicStyle {
  complexity: number;
  syncopation: number;
  subdivision: number[];
  patterns: string[];
}

export interface TexturalStyle {
  density: number;
  layering: LayeringType[];
  counterpoint: CounterpointStyle;
}

export interface LayeringType {
  name: string;
  voices: number;
  independence: number;
}

export interface CounterpointStyle {
  species: number[];
  strictness: number;
  dissonance: string[];
}

export interface InstrumentRole {
  instrument: string;
  role: "melody" | "harmony" | "bass" | "percussion" | "texture";
  importance: number;
}

export interface Period {
  name: string;
  years: [number, number];
  characteristics: StyleCharacteristics;
  keyComposers: string[];
}

export interface ComposerStyle {
  name: string;
  period: string;
  characteristics: StyleCharacteristics;
  influences: string[];
  innovations: string[];
}

export interface RegionalStyle {
  region: string;
  characteristics: StyleCharacteristics;
  instruments: string[];
  scales: ScaleType[];
}

export interface ScaleType {
  name: string;
  intervals: number[];
  character: string;
  usage: string[];
}

export interface TemplateLibrary {
  songs: SongTemplate[];
  arrangements: ArrangementTemplate[];
  progressions: ProgressionTemplate[];
  rhythms: RhythmTemplate[];
}

export interface SongTemplate {
  name: string;
  structure: string[];
  style: string;
  instruments: string[];
  template: CompositionTemplate;
}

export interface CompositionTemplate {
  sections: TemplateSection[];
  harmony: HarmonyTemplate;
  melody: MelodyTemplate;
  rhythm: RhythmTemplate;
}

export interface TemplateSection {
  name: string;
  bars: number;
  chord: string;
  melody: string;
  rhythm: string;
}

export interface HarmonyTemplate {
  progressions: string[];
  voicings: VoicingTemplate[];
  substitutions: ChordSubstitution[];
}

export interface VoicingTemplate {
  chord: string;
  voicing: number[];
  inversion: number;
  doubling: string[];
}

export interface ChordSubstitution {
  original: string;
  substitute: string;
  context: string[];
  probability: number;
}

export interface MelodyTemplate {
  contour: string;
  rhythm: string;
  intervals: number[];
  phrases: PhraseTemplate[];
}

export interface PhraseTemplate {
  contour: string;
  rhythm: string;
  length: number;
  cadence: string;
}

export interface RhythmTemplate {
  pattern: string;
  feel: string;
  accents: number[];
  subdivision: number;
}

export interface ArrangementTemplate {
  name: string;
  ensemble: string[];
  style: string;
  voicing: VoicingStrategy;
}

export interface VoicingStrategy {
  distribution: InstrumentDistribution[];
  doubling: DoublingStrategy;
  spacing: SpacingStrategy;
}

export interface InstrumentDistribution {
  instrument: string;
  range: [number, number];
  priority: number;
  role: string;
}

export interface DoublingStrategy {
  octaves: boolean;
  unison: boolean;
  intervals: number[];
}

export interface SpacingStrategy {
  close: boolean;
  open: boolean;
  mixed: boolean;
  guidelines: SpacingGuideline[];
}

export interface SpacingGuideline {
  voices: number;
  maxInterval: number;
  preferred: number;
}

export interface ProgressionTemplate {
  name: string;
  chords: string[];
  functions: string[];
  variations: ProgressionVariation[];
}

export interface ProgressionVariation {
  name: string;
  substitutions: ChordSubstitution[];
  additions: ChordAddition[];
}

export interface ChordAddition {
  position: number;
  chord: string;
  function: string;
}

export interface MIDIEngineConfig {
  generation: MIDIGenerationConfig;
  processing: MIDIProcessingConfig;
  output: MIDIOutputConfig;
  timing: TimingConfig;
}

export interface MIDIGenerationConfig {
  realTime: boolean;
  quantization: QuantizationConfig;
  velocity: VelocityConfig;
  articulation: ArticulationConfig;
}

export interface QuantizationConfig {
  enabled: boolean;
  resolution: number; // ticks per quarter note
  swing: number; // 0-1
  humanization: HumanizationConfig;
}

export interface HumanizationConfig {
  timing: TimingHumanization;
  velocity: VelocityHumanization;
  microtiming: MicrotimingConfig;
}

export interface TimingHumanization {
  enabled: boolean;
  amount: number; // ms
  distribution: "uniform" | "gaussian" | "exponential";
}

export interface VelocityHumanization {
  enabled: boolean;
  amount: number; // velocity units
  correlation: number; // correlation with timing
}

export interface MicrotimingConfig {
  enabled: boolean;
  groove: GrooveTemplate[];
  adaptation: boolean;
}

export interface GrooveTemplate {
  name: string;
  pattern: MicrotimingOffset[];
  style: string;
}

export interface MicrotimingOffset {
  position: number; // beat position
  offset: number; // ms
  velocity: number; // velocity modifier
}

export interface VelocityConfig {
  curve: VelocityCurve;
  dynamics: DynamicsConfig;
  expression: ExpressionConfig;
}

export interface VelocityCurve {
  type: "linear" | "exponential" | "logarithmic" | "custom";
  parameters: number[];
  range: [number, number];
}

export interface DynamicsConfig {
  levels: DynamicLevel[];
  transitions: DynamicTransition[];
  automation: AutomationConfig;
}

export interface DynamicLevel {
  name: string;
  velocity: number;
  symbol: string;
}

export interface DynamicTransition {
  from: string;
  to: string;
  duration: number;
  curve: string;
}

export interface AutomationConfig {
  enabled: boolean;
  controllers: ControllerMapping[];
  phrases: PhraseAutomation[];
}

export interface ControllerMapping {
  controller: number;
  parameter: string;
  range: [number, number];
  curve: string;
}

export interface PhraseAutomation {
  type: "crescendo" | "diminuendo" | "accent" | "legato" | "staccato";
  intensity: number;
  application: string;
}

export interface ArticulationConfig {
  types: ArticulationType[];
  detection: ArticulationDetection;
  generation: ArticulationGeneration;
}

export interface ArticulationType {
  name: string;
  symbol: string;
  length: number; // percentage of note value
  attack: number; // velocity modifier
  release: number; // note-off velocity
}

export interface ArticulationDetection {
  enabled: boolean;
  algorithms: DetectionAlgorithm[];
  confidence: number;
}

export interface DetectionAlgorithm {
  name: string;
  weight: number;
  parameters: any;
}

export interface ArticulationGeneration {
  contextual: boolean;
  stylistic: boolean;
  random: RandomArticulation;
}

export interface RandomArticulation {
  enabled: boolean;
  probability: Record<string, number>;
  coherence: number;
}

export interface MIDIProcessingConfig {
  filters: MIDIFilter[];
  transformations: MIDITransformation[];
  validation: MIDIValidation;
}

export interface MIDIFilter {
  type: "channel" | "note" | "velocity" | "timing" | "controller";
  parameters: FilterParameters;
  enabled: boolean;
}

export interface FilterParameters {
  [key: string]: any;
}

export interface MIDITransformation {
  type: "transpose" | "scale" | "quantize" | "humanize" | "compress";
  parameters: TransformationParameters;
  enabled: boolean;
}

export interface TransformationParameters {
  [key: string]: any;
}

export interface MIDIValidation {
  enabled: boolean;
  checks: ValidationCheck[];
  corrections: AutoCorrection[];
}

export interface ValidationCheck {
  name: string;
  severity: "warning" | "error";
  parameters: any;
}

export interface AutoCorrection {
  check: string;
  action: "fix" | "remove" | "alert";
  parameters: any;
}

export interface MIDIOutputConfig {
  formats: OutputFormat[];
  routing: RoutingConfig;
  synchronization: SyncConfig;
}

export interface OutputFormat {
  type: "file" | "realtime" | "network";
  format: "midi" | "osc" | "json";
  parameters: OutputParameters;
}

export interface OutputParameters {
  [key: string]: any;
}

export interface RoutingConfig {
  channels: ChannelRouting[];
  devices: DeviceRouting[];
  virtual: VirtualRouting[];
}

export interface ChannelRouting {
  source: number;
  destination: number;
  filters: string[];
}

export interface DeviceRouting {
  name: string;
  type: "input" | "output" | "bidirectional";
  channels: number[];
}

export interface VirtualRouting {
  name: string;
  type: string;
  configuration: any;
}

export interface SyncConfig {
  master: boolean;
  source: "internal" | "midi" | "audio" | "network";
  tempo: TempoConfig;
  timecode: TimecodeConfig;
}

export interface TempoConfig {
  bpm: number;
  variations: TempoVariation[];
  automation: TempoAutomation;
}

export interface TempoVariation {
  position: number; // bar number
  bpm: number;
  transition: string;
}

export interface TempoAutomation {
  enabled: boolean;
  curve: string;
  range: [number, number];
}

export interface TimecodeConfig {
  format: "smpte" | "midi" | "bars_beats";
  framerate: number;
  offset: number;
}

export interface TimingConfig {
  precision: TimingPrecision;
  latency: LatencyConfig;
  scheduling: SchedulingConfig;
}

export interface TimingPrecision {
  resolution: number; // ticks per quarter note
  accuracy: number; // ms
  jitter: number; // ms
}

export interface LatencyConfig {
  compensation: boolean;
  measurement: boolean;
  adaptive: boolean;
  target: number; // ms
}

export interface SchedulingConfig {
  lookahead: number; // ms
  algorithm: "fifo" | "priority" | "deadline";
  buffering: BufferingConfig;
}

export interface BufferingConfig {
  size: number; // events
  adaptive: boolean;
  overflow: "drop" | "expand" | "compress";
}

export interface OrchestrationConfig {
  instruments: InstrumentConfig[];
  ensembles: EnsembleConfig[];
  mixing: MixingConfig;
  spatialization: SpatializationConfig;
}

export interface InstrumentConfig {
  name: string;
  family: string;
  range: [number, number];
  techniques: PlayingTechnique[];
  limitations: InstrumentLimitation[];
  samples: SampleConfig;
}

export interface PlayingTechnique {
  name: string;
  notation: string;
  midiImplementation: MIDIImplementation;
  difficulty: number;
}

export interface MIDIImplementation {
  controller: number;
  value: number;
  combination: ControllerCombination[];
}

export interface ControllerCombination {
  controllers: number[];
  values: number[];
  result: string;
}

export interface InstrumentLimitation {
  type: "range" | "polyphony" | "technique" | "dynamic";
  parameters: any;
  severity: "warning" | "error";
}

export interface SampleConfig {
  library: string;
  mapping: KeyMapping[];
  layers: LayerConfig[];
}

export interface KeyMapping {
  note: number;
  sample: string;
  velocity: [number, number];
}

export interface LayerConfig {
  name: string;
  velocity: [number, number];
  samples: string[];
}

export interface EnsembleConfig {
  name: string;
  instruments: string[];
  balance: BalanceConfig;
  interaction: InteractionConfig;
}

export interface BalanceConfig {
  dynamics: InstrumentBalance[];
  frequency: FrequencyBalance[];
  spatial: SpatialBalance[];
}

export interface InstrumentBalance {
  instrument: string;
  level: number;
  pan: number;
  role: string;
}

export interface FrequencyBalance {
  instrument: string;
  eq: EQSetting[];
  filtering: FilterSetting[];
}

export interface EQSetting {
  frequency: number;
  gain: number;
  q: number;
  type: string;
}

export interface FilterSetting {
  type: "highpass" | "lowpass" | "bandpass" | "notch";
  frequency: number;
  resonance: number;
}

export interface SpatialBalance {
  instrument: string;
  position: [number, number, number]; // x, y, z
  orientation: [number, number, number]; // pitch, yaw, roll
}

export interface InteractionConfig {
  harmony: HarmonyInteraction[];
  rhythm: RhythmInteraction[];
  melody: MelodyInteraction[];
}

export interface HarmonyInteraction {
  instruments: string[];
  type: "unison" | "harmony" | "counterpoint" | "accompaniment";
  rules: InteractionRule[];
}

export interface RhythmInteraction {
  instruments: string[];
  type: "unison" | "polyrhythm" | "complement" | "contrast";
  rules: InteractionRule[];
}

export interface MelodyInteraction {
  instruments: string[];
  type: "unison" | "canon" | "dialogue" | "accompaniment";
  rules: InteractionRule[];
}

export interface InteractionRule {
  name: string;
  condition: string;
  action: string;
  weight: number;
}

export interface MixingConfig {
  algorithm: "simple" | "advanced" | "ai";
  processors: AudioProcessor[];
  automation: MixAutomation[];
}

export interface AudioProcessor {
  type: "eq" | "compressor" | "reverb" | "delay" | "chorus" | "distortion";
  parameters: ProcessorParameters;
  routing: ProcessorRouting;
}

export interface ProcessorParameters {
  [key: string]: any;
}

export interface ProcessorRouting {
  input: string[];
  output: string[];
  sends: SendConfig[];
}

export interface SendConfig {
  destination: string;
  level: number;
  pre: boolean;
}

export interface MixAutomation {
  parameter: string;
  curve: AutomationCurve;
  sync: boolean;
}

export interface AutomationCurve {
  points: AutomationPoint[];
  interpolation: string;
}

export interface AutomationPoint {
  time: number;
  value: number;
}

export interface SpatializationConfig {
  enabled: boolean;
  algorithm: "3d" | "binaural" | "surround" | "ambisonics";
  room: RoomSimulation;
  rendering: SpatialRendering;
}

export interface RoomSimulation {
  size: [number, number, number];
  materials: RoomMaterial[];
  acoustics: AcousticProperties;
}

export interface RoomMaterial {
  surface: string;
  absorption: number[];
  reflection: number[];
}

export interface AcousticProperties {
  reverbTime: number;
  diffusion: number;
  clarity: number;
  warmth: number;
}

export interface SpatialRendering {
  quality: "low" | "medium" | "high" | "ultra";
  precision: number;
  optimization: boolean;
}

export interface MusicTheoryConfig {
  analysis: TheoryAnalysisConfig;
  validation: TheoryValidationConfig;
  generation: TheoryGenerationConfig;
  education: TheoryEducationConfig;
}

export interface TheoryAnalysisConfig {
  harmonic: HarmonicAnalysisConfig;
  melodic: MelodicAnalysisConfig;
  rhythmic: RhythmicAnalysisConfig;
  formal: FormalAnalysisConfig;
}

export interface HarmonicAnalysisConfig {
  chordIdentification: boolean;
  functionAnalysis: boolean;
  voiceLeading: boolean;
  nonChordTones: boolean;
  modulation: boolean;
}

export interface MelodicAnalysisConfig {
  motifIdentification: boolean;
  phraseStructure: boolean;
  contourAnalysis: boolean;
  intervalAnalysis: boolean;
  scaleAnalysis: boolean;
}

export interface RhythmicAnalysisConfig {
  meterDetection: boolean;
  accentPattern: boolean;
  syncopationAnalysis: boolean;
  groupingStructure: boolean;
}

export interface FormalAnalysisConfig {
  sectionDetection: boolean;
  formClassification: boolean;
  thematicAnalysis: boolean;
  developmentTracking: boolean;
}

export interface TheoryValidationConfig {
  rules: TheoryRule[];
  strictness: "strict" | "moderate" | "lenient";
  style: string;
  exceptions: ExceptionRule[];
}

export interface TheoryRule {
  name: string;
  type: "harmonic" | "melodic" | "rhythmic" | "formal";
  condition: string;
  violation: string;
  severity: "error" | "warning" | "suggestion";
}

export interface ExceptionRule {
  rule: string;
  context: string;
  justification: string;
}

export interface TheoryGenerationConfig {
  guidelines: GenerationGuideline[];
  creativity: CreativityConfig;
  constraints: TheoryConstraints;
}

export interface GenerationGuideline {
  aspect: string;
  principle: string;
  weight: number;
  flexibility: number;
}

export interface CreativityConfig {
  innovation: number;
  tradition: number;
  experimentation: number;
  coherence: number;
}

export interface TheoryConstraints {
  harmonic: HarmonicConstraint[];
  melodic: MelodicConstraint[];
  rhythmic: RhythmicConstraint[];
  formal: FormalConstraint[];
}

export interface HarmonicConstraint {
  rule: string;
  weight: number;
  flexibility: number;
}

export interface MelodicConstraint {
  rule: string;
  weight: number;
  flexibility: number;
}

export interface RhythmicConstraint {
  rule: string;
  weight: number;
  flexibility: number;
}

export interface FormalConstraint {
  rule: string;
  weight: number;
  flexibility: number;
}

export interface TheoryEducationConfig {
  explanations: boolean;
  examples: boolean;
  exercises: boolean;
  feedback: boolean;
}

export interface GenerationConfig {
  algorithms: GenerationAlgorithm[];
  modes: GenerationMode[];
  quality: QualityConfig;
  output: GenerationOutputConfig;
}

export interface GenerationAlgorithm {
  name: string;
  type: "rule_based" | "statistical" | "neural" | "genetic" | "hybrid";
  weight: number;
  parameters: AlgorithmParameters;
}

export interface AlgorithmParameters {
  [key: string]: any;
}

export interface GenerationMode {
  name: string;
  description: string;
  algorithms: string[];
  constraints: string[];
  style: string;
}

export interface QualityConfig {
  assessment: QualityAssessment;
  improvement: QualityImprovement;
  metrics: QualityMetric[];
}

export interface QualityAssessment {
  enabled: boolean;
  criteria: AssessmentCriterion[];
  weighting: QualityWeighting;
}

export interface AssessmentCriterion {
  name: string;
  type: "objective" | "subjective";
  algorithm: string;
  weight: number;
}

export interface QualityWeighting {
  harmonic: number;
  melodic: number;
  rhythmic: number;
  formal: number;
  aesthetic: number;
}

export interface QualityImprovement {
  enabled: boolean;
  iterations: number;
  threshold: number;
  techniques: ImprovementTechnique[];
}

export interface ImprovementTechnique {
  name: string;
  applicability: string[];
  effectiveness: number;
}

export interface QualityMetric {
  name: string;
  type: "technical" | "aesthetic" | "theoretical";
  calculation: string;
  range: [number, number];
}

export interface GenerationOutputConfig {
  formats: GenerationFormat[];
  metadata: MetadataConfig;
  licensing: LicensingConfig;
}

export interface GenerationFormat {
  type: "midi" | "audio" | "score" | "lead_sheet" | "analysis";
  quality: string;
  options: FormatOptions;
}

export interface FormatOptions {
  [key: string]: any;
}

export interface MetadataConfig {
  composer: boolean;
  style: boolean;
  theory: boolean;
  generation: boolean;
  performance: boolean;
}

export interface LicensingConfig {
  default: string;
  options: LicenseOption[];
  attribution: boolean;
}

export interface LicenseOption {
  name: string;
  type: string;
  restrictions: string[];
  permissions: string[];
}

export interface CompositionProject {
  id: string;
  title: string;
  composer: string;
  style: string;
  configuration: MusicCompositionConfig;
  status: "draft" | "composing" | "arranging" | "mixing" | "completed";
  progress: number;
  sections: CompositionSection[];
  tracks: CompositionTrack[];
  analysis: CompositionAnalysis;
  metadata: ProjectMetadata;
}

export interface CompositionSection {
  id: string;
  name: string;
  startBar: number;
  endBar: number;
  key: string;
  tempo: number;
  style: string;
  description: string;
}

export interface CompositionTrack {
  id: string;
  name: string;
  instrument: string;
  channel: number;
  muted: boolean;
  solo: boolean;
  volume: number;
  pan: number;
  midi: MIDITrackData;
}

export interface MIDITrackData {
  events: MIDIEvent[];
  notes: MIDINoteEvent[];
  controllers: MIDIControllerEvent[];
  meta: MIDIMetaEvent[];
}

export interface MIDIEvent {
  type: string;
  time: number;
  data: any;
}

export interface MIDINoteEvent {
  note: number;
  velocity: number;
  startTime: number;
  duration: number;
  channel: number;
}

export interface MIDIControllerEvent {
  controller: number;
  value: number;
  time: number;
  channel: number;
}

export interface MIDIMetaEvent {
  type: string;
  data: any;
  time: number;
}

export interface CompositionAnalysis {
  harmonic: HarmonicAnalysis;
  melodic: MelodicAnalysis;
  rhythmic: RhythmicAnalysis;
  formal: FormalAnalysis;
  quality: CompositionQuality;
}

export interface HarmonicAnalysis {
  keySignature: string;
  modulations: Modulation[];
  chordProgressions: AnalyzedProgression[];
  dissonance: DissonanceAnalysis;
  voiceLeading: VoiceLeadingAnalysis;
}

export interface Modulation {
  fromKey: string;
  toKey: string;
  startBar: number;
  endBar: number;
  type: string;
  pivot: string;
}

export interface AnalyzedProgression {
  chords: AnalyzedChord[];
  function: string;
  quality: number;
  style: string;
}

export interface AnalyzedChord {
  symbol: string;
  root: number;
  quality: string;
  inversion: number;
  function: string;
  tensions: number[];
}

export interface DissonanceAnalysis {
  level: number;
  treatment: DissonanceTreatment[];
  resolution: ResolutionAnalysis[];
}

export interface DissonanceTreatment {
  type: string;
  frequency: number;
  quality: number;
}

export interface ResolutionAnalysis {
  type: string;
  success: number;
  style: string;
}

export interface VoiceLeadingAnalysis {
  smoothness: number;
  independence: number;
  violations: VoiceLeadingViolation[];
  quality: number;
}

export interface VoiceLeadingViolation {
  type: string;
  location: number;
  severity: string;
  suggestion: string;
}

export interface MelodicAnalysis {
  contour: ContourAnalysis;
  intervals: IntervalAnalysis;
  phrases: PhraseAnalysis;
  motifs: MotifAnalysis;
}

export interface ContourAnalysis {
  shape: string;
  direction: DirectionAnalysis;
  climax: ClimaxAnalysis;
  balance: number;
}

export interface DirectionAnalysis {
  ascending: number;
  descending: number;
  static: number;
  overall: string;
}

export interface ClimaxAnalysis {
  position: number;
  height: number;
  approach: string;
  resolution: string;
}

export interface IntervalAnalysis {
  distribution: IntervalDistribution[];
  complexity: number;
  character: string;
}

export interface IntervalDistribution {
  interval: number;
  frequency: number;
  percentage: number;
}

export interface PhraseAnalysis {
  structure: PhraseStructure[];
  length: PhraseLength;
  cadences: CadenceAnalysis[];
}

export interface PhraseStructure {
  start: number;
  end: number;
  type: string;
  character: string;
}

export interface PhraseLength {
  average: number;
  distribution: number[];
  regularity: number;
}

export interface CadenceAnalysis {
  position: number;
  type: string;
  strength: number;
  quality: number;
}

export interface MotifAnalysis {
  identification: MotifIdentification[];
  development: MotifDevelopment[];
  unity: number;
}

export interface MotifIdentification {
  id: string;
  pattern: number[];
  occurrences: MotifOccurrence[];
  importance: number;
}

export interface MotifOccurrence {
  position: number;
  variation: string;
  quality: number;
}

export interface MotifDevelopment {
  motif: string;
  techniques: DevelopmentTechnique[];
  effectiveness: number;
}

export interface DevelopmentTechnique {
  name: string;
  application: number[];
  quality: number;
}

export interface RhythmicAnalysis {
  complexity: number;
  syncopation: SyncopationAnalysis;
  patterns: RhythmPatternAnalysis;
  meter: MeterAnalysis;
}

export interface SyncopationAnalysis {
  level: number;
  types: SyncopationTypeAnalysis[];
  effectiveness: number;
}

export interface SyncopationTypeAnalysis {
  type: string;
  frequency: number;
  strength: number;
}

export interface RhythmPatternAnalysis {
  patterns: IdentifiedPattern[];
  repetition: number;
  variation: number;
}

export interface IdentifiedPattern {
  pattern: string;
  frequency: number;
  variation: string[];
}

export interface MeterAnalysis {
  stability: number;
  changes: MeterChange[];
  grouping: GroupingAnalysis;
}

export interface MeterChange {
  position: number;
  from: string;
  to: string;
  justification: string;
}

export interface GroupingAnalysis {
  levels: GroupingLevel[];
  clarity: number;
  hierarchy: number;
}

export interface GroupingLevel {
  level: number;
  grouping: number[];
  strength: number;
}

export interface FormalAnalysis {
  structure: FormalStructure;
  sections: SectionAnalysis[];
  unity: UnityAnalysis;
  proportions: ProportionAnalysis;
}

export interface FormalStructure {
  type: string;
  sections: string[];
  relationships: SectionRelationship[];
}

export interface SectionRelationship {
  section1: string;
  section2: string;
  relationship: string;
  strength: number;
}

export interface SectionAnalysis {
  name: string;
  character: SectionCharacter;
  development: SectionDevelopment;
  contrast: SectionContrast;
}

export interface SectionCharacter {
  mood: string;
  energy: number;
  complexity: number;
  stability: number;
}

export interface SectionDevelopment {
  type: string;
  intensity: number;
  techniques: string[];
}

export interface SectionContrast {
  previous: number;
  next: number;
  overall: number;
}

export interface UnityAnalysis {
  thematic: number;
  harmonic: number;
  rhythmic: number;
  overall: number;
}

export interface ProportionAnalysis {
  sections: SectionProportion[];
  balance: number;
  golden: number;
}

export interface SectionProportion {
  section: string;
  length: number;
  percentage: number;
  ideal: number;
}

export interface CompositionQuality {
  overall: number;
  technical: TechnicalQuality;
  aesthetic: AestheticQuality;
  originality: OriginalityQuality;
}

export interface TechnicalQuality {
  harmony: number;
  melody: number;
  rhythm: number;
  form: number;
  orchestration: number;
}

export interface AestheticQuality {
  beauty: number;
  expressiveness: number;
  coherence: number;
  impact: number;
}

export interface OriginalityQuality {
  innovation: number;
  creativity: number;
  uniqueness: number;
  influence: number;
}

export interface ProjectMetadata {
  created: Date;
  modified: Date;
  version: string;
  generator: string;
  settings: any;
  notes: string;
}

export class LyriaMusicComposer extends EventEmitter {
  private logger: Logger;
  private config: LyriaConfig;
  private projects: Map<string, CompositionProject> = new Map();
  private compositionEngine: CompositionEngine;
  private midiEngine: MIDIEngine;
  private orchestrationEngine: OrchestrationEngine;
  private theoryEngine: MusicTheoryEngine;
  private generationEngine: GenerationEngine;
  private performanceMonitor: PerformanceMonitor;

  constructor(config: LyriaConfig) {
    super();
    this.config = config;
    this.logger = new Logger("LyriaMusicComposer");

    this.initializeComponents();
    this.setupEventHandlers();
  }

  /**
   * Initializes the music composition engine
   */
  async initialize(): Promise<void> {
    try {
      this.logger.info("Initializing Lyria Music Composer");

      // Initialize all engines
      await this.compositionEngine.initialize();
      await this.midiEngine.initialize();
      await this.orchestrationEngine.initialize();
      await this.theoryEngine.initialize();
      await this.generationEngine.initialize();
      await this.performanceMonitor.start();

      this.emit("initialized");
    } catch (error) {
      this.logger.error("Failed to initialize music composer", error);
      throw error;
    }
  }

  /**
   * Creates a new composition project
   */
  async createProject(
    title: string,
    style: string,
    config?: Partial<MusicCompositionConfig>,
  ): Promise<ServiceResponse<CompositionProject>> {
    try {
      this.logger.info("Creating composition project", { title, style });

      const projectId = this.generateProjectId();
      const fullConfig = this.mergeConfiguration(config);

      const project: CompositionProject = {
        id: projectId,
        title,
        composer: "Lyria AI",
        style,
        configuration: fullConfig,
        status: "draft",
        progress: 0,
        sections: [],
        tracks: [],
        analysis: await this.createEmptyAnalysis(),
        metadata: {
          created: new Date(),
          modified: new Date(),
          version: "1.0.0",
          generator: "Lyria v4.0",
          settings: config,
          notes: "",
        },
      };

      this.projects.set(projectId, project);

      this.emit("project:created", { projectId, project });

      return {
        success: true,
        data: project,
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: 0,
          region: "local",
        },
      };
    } catch (error) {
      this.logger.error("Failed to create project", { title, error });
      return this.createErrorResponse("PROJECT_CREATION_FAILED", error.message);
    }
  }

  /**
   * Composes music for a project using AI
   */
  async composeMusic(
    projectId: string,
    prompt?: string,
    constraints?: any,
  ): Promise<ServiceResponse<CompositionProject>> {
    const startTime = Date.now();

    try {
      this.logger.info("Composing music", { projectId, prompt });

      const project = this.projects.get(projectId);
      if (!project) {
        throw new Error(`Project not found: ${projectId}`);
      }

      project.status = "composing";

      // Generate composition structure
      const structure = await this.compositionEngine.generateStructure(
        project.configuration,
        project.style,
        prompt,
      );

      project.sections = structure.sections;
      project.progress = 20;
      this.emit("project:progress", { projectId, progress: project.progress });

      // Generate harmonic progression
      const harmony = await this.compositionEngine.generateHarmony(
        structure,
        project.configuration,
        constraints,
      );

      project.progress = 40;
      this.emit("project:progress", { projectId, progress: project.progress });

      // Generate melodies
      const melodies = await this.compositionEngine.generateMelodies(
        structure,
        harmony,
        project.configuration,
      );

      project.progress = 60;
      this.emit("project:progress", { projectId, progress: project.progress });

      // Generate rhythmic patterns
      const rhythms = await this.compositionEngine.generateRhythms(
        structure,
        project.configuration,
      );

      project.progress = 80;
      this.emit("project:progress", { projectId, progress: project.progress });

      // Combine into full composition
      const composition = await this.compositionEngine.combineElements(
        structure,
        harmony,
        melodies,
        rhythms,
      );

      // Generate MIDI tracks
      project.tracks = await this.midiEngine.generateTracks(
        composition,
        project.configuration.instruments,
      );

      // Analyze composition
      project.analysis =
        await this.theoryEngine.analyzeComposition(composition);

      project.status = "completed";
      project.progress = 100;
      project.metadata.modified = new Date();

      this.emit("project:completed", { projectId, project });

      return {
        success: true,
        data: project,
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: Date.now() - startTime,
          region: "local",
        },
      };
    } catch (error) {
      this.logger.error("Failed to compose music", { projectId, error });

      const project = this.projects.get(projectId);
      if (project) {
        project.status = "draft";
      }

      return this.createErrorResponse("COMPOSITION_FAILED", error.message);
    }
  }

  /**
   * Arranges existing composition for specific ensemble
   */
  async arrangeForEnsemble(
    projectId: string,
    ensemble: string[],
  ): Promise<ServiceResponse<CompositionProject>> {
    try {
      this.logger.info("Arranging for ensemble", { projectId, ensemble });

      const project = this.projects.get(projectId);
      if (!project) {
        throw new Error(`Project not found: ${projectId}`);
      }

      project.status = "arranging";

      // Analyze ensemble capabilities
      const ensembleConfig =
        await this.orchestrationEngine.analyzeEnsemble(ensemble);

      // Rearrange existing tracks
      const arrangedTracks = await this.orchestrationEngine.arrange(
        project.tracks,
        ensembleConfig,
        project.configuration,
      );

      project.tracks = arrangedTracks;
      project.status = "completed";
      project.metadata.modified = new Date();

      this.emit("project:arranged", { projectId, ensemble });

      return {
        success: true,
        data: project,
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: 0,
          region: "local",
        },
      };
    } catch (error) {
      this.logger.error("Failed to arrange composition", { projectId, error });
      return this.createErrorResponse("ARRANGEMENT_FAILED", error.message);
    }
  }

  /**
   * Exports project to various formats
   */
  async exportProject(
    projectId: string,
    format: "midi" | "audio" | "score" | "json",
    options?: any,
  ): Promise<ServiceResponse<string>> {
    try {
      this.logger.info("Exporting project", { projectId, format });

      const project = this.projects.get(projectId);
      if (!project) {
        throw new Error(`Project not found: ${projectId}`);
      }

      let exportPath: string;

      switch (format) {
        case "midi":
          exportPath = await this.midiEngine.exportMIDI(project, options);
          break;

        case "audio":
          exportPath = await this.orchestrationEngine.renderAudio(
            project,
            options,
          );
          break;

        case "score":
          exportPath = await this.compositionEngine.generateScore(
            project,
            options,
          );
          break;

        case "json":
          exportPath = await this.exportJSON(project, options);
          break;

        default:
          throw new Error(`Unsupported export format: ${format}`);
      }

      this.emit("project:exported", { projectId, format, path: exportPath });

      return {
        success: true,
        data: exportPath,
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: 0,
          region: "local",
        },
      };
    } catch (error) {
      this.logger.error("Failed to export project", {
        projectId,
        format,
        error,
      });
      return this.createErrorResponse("EXPORT_FAILED", error.message);
    }
  }

  /**
   * Gets project by ID
   */
  async getProject(
    projectId: string,
  ): Promise<ServiceResponse<CompositionProject>> {
    try {
      const project = this.projects.get(projectId);
      if (!project) {
        throw new Error(`Project not found: ${projectId}`);
      }

      return {
        success: true,
        data: project,
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: 0,
          region: "local",
        },
      };
    } catch (error) {
      this.logger.error("Failed to get project", { projectId, error });
      return this.createErrorResponse("PROJECT_GET_FAILED", error.message);
    }
  }

  /**
   * Lists all projects
   */
  async listProjects(): Promise<ServiceResponse<CompositionProject[]>> {
    try {
      const projects = Array.from(this.projects.values());

      return {
        success: true,
        data: projects,
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: 0,
          region: "local",
        },
      };
    } catch (error) {
      this.logger.error("Failed to list projects", error);
      return this.createErrorResponse("PROJECT_LIST_FAILED", error.message);
    }
  }

  /**
   * Gets performance metrics
   */
  async getMetrics(): Promise<ServiceResponse<PerformanceMetrics>> {
    try {
      const metrics = await this.performanceMonitor.getMetrics();

      return {
        success: true,
        data: metrics,
        metadata: {
          requestId: this.generateRequestId(),
          timestamp: new Date(),
          processingTime: 0,
          region: "local",
        },
      };
    } catch (error) {
      this.logger.error("Failed to get metrics", error);
      return this.createErrorResponse("METRICS_GET_FAILED", error.message);
    }
  }

  // ==================== Private Helper Methods ====================

  private initializeComponents(): void {
    this.compositionEngine = new CompositionEngine(this.config.composition);
    this.midiEngine = new MIDIEngine(this.config.midi);
    this.orchestrationEngine = new OrchestrationEngine(
      this.config.orchestration,
    );
    this.theoryEngine = new MusicTheoryEngine(this.config.theory);
    this.generationEngine = new GenerationEngine(this.config.generation);
    this.performanceMonitor = new PerformanceMonitor();
  }

  private setupEventHandlers(): void {
    this.compositionEngine.on(
      "composition:progress",
      this.handleCompositionProgress.bind(this),
    );
    this.midiEngine.on("midi:generated", this.handleMidiGenerated.bind(this));
    this.orchestrationEngine.on(
      "arrangement:completed",
      this.handleArrangementCompleted.bind(this),
    );
  }

  private mergeConfiguration(
    config?: Partial<MusicCompositionConfig>,
  ): MusicCompositionConfig {
    // Merge with default configuration
    return {
      style: config?.style || this.getDefaultStyle(),
      structure: config?.structure || this.getDefaultStructure(),
      instruments: config?.instruments || this.getDefaultInstruments(),
      tempo: config?.tempo || this.getDefaultTempo(),
      key: config?.key || this.getDefaultKey(),
      timeSignature: config?.timeSignature || this.getDefaultTimeSignature(),
    };
  }

  private getDefaultStyle(): any {
    return {
      genre: "classical",
      subgenre: "romantic",
      influences: ["chopin", "debussy"],
      characteristics: ["expressive", "melodic", "harmonic"],
    };
  }

  private getDefaultStructure(): any {
    return {
      sections: [
        { name: "intro", type: "intro", duration: 8, key: "C", tempo: 120 },
        { name: "verse", type: "verse", duration: 16, key: "C", tempo: 120 },
        { name: "chorus", type: "chorus", duration: 16, key: "C", tempo: 120 },
        { name: "outro", type: "outro", duration: 8, key: "C", tempo: 120 },
      ],
      transitions: [],
      dynamics: {
        overall: "mf",
        variation: true,
        crescendos: [],
      },
    };
  }

  private getDefaultInstruments(): any[] {
    return [
      {
        id: "piano",
        type: "melodic",
        midiProgram: 0,
        channel: 0,
        volume: 80,
        pan: 0,
        effects: [],
      },
    ];
  }

  private getDefaultTempo(): any {
    return {
      bpm: 120,
      variations: [],
      swing: 0,
    };
  }

  private getDefaultKey(): any {
    return {
      tonic: "C",
      mode: "major",
      accidentals: [],
    };
  }

  private getDefaultTimeSignature(): any {
    return {
      numerator: 4,
      denominator: 4,
    };
  }

  private async createEmptyAnalysis(): Promise<CompositionAnalysis> {
    return {
      harmonic: {
        keySignature: "C major",
        modulations: [],
        chordProgressions: [],
        dissonance: { level: 0, treatment: [], resolution: [] },
        voiceLeading: {
          smoothness: 0,
          independence: 0,
          violations: [],
          quality: 0,
        },
      },
      melodic: {
        contour: {
          shape: "",
          direction: { ascending: 0, descending: 0, static: 0, overall: "" },
          climax: { position: 0, height: 0, approach: "", resolution: "" },
          balance: 0,
        },
        intervals: { distribution: [], complexity: 0, character: "" },
        phrases: {
          structure: [],
          length: { average: 0, distribution: [], regularity: 0 },
          cadences: [],
        },
        motifs: { identification: [], development: [], unity: 0 },
      },
      rhythmic: {
        complexity: 0,
        syncopation: { level: 0, types: [], effectiveness: 0 },
        patterns: { patterns: [], repetition: 0, variation: 0 },
        meter: {
          stability: 0,
          changes: [],
          grouping: { levels: [], clarity: 0, hierarchy: 0 },
        },
      },
      formal: {
        structure: { type: "", sections: [], relationships: [] },
        sections: [],
        unity: { thematic: 0, harmonic: 0, rhythmic: 0, overall: 0 },
        proportions: { sections: [], balance: 0, golden: 0 },
      },
      quality: {
        overall: 0,
        technical: {
          harmony: 0,
          melody: 0,
          rhythm: 0,
          form: 0,
          orchestration: 0,
        },
        aesthetic: { beauty: 0, expressiveness: 0, coherence: 0, impact: 0 },
        originality: {
          innovation: 0,
          creativity: 0,
          uniqueness: 0,
          influence: 0,
        },
      },
    };
  }

  private async exportJSON(
    project: CompositionProject,
    options?: any,
  ): Promise<string> {
    const exportData = {
      project,
      exportTime: new Date(),
      format: "json",
      version: "1.0.0",
    };

    const path = `/exports/${project.id}/composition.json`;
    // Write JSON file implementation would go here
    return path;
  }

  private generateProjectId(): string {
    return `comp_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
  }

  private generateRequestId(): string {
    return `req_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
  }

  private createErrorResponse(
    code: string,
    message: string,
  ): ServiceResponse<any> {
    return {
      success: false,
      error: {
        code,
        message,
        retryable: false,
        timestamp: new Date(),
      },
      metadata: {
        requestId: this.generateRequestId(),
        timestamp: new Date(),
        processingTime: 0,
        region: "local",
      },
    };
  }

  private handleCompositionProgress(event: any): void {
    this.logger.debug("Composition progress", event);
    this.emit("composition:progress", event);
  }

  private handleMidiGenerated(event: any): void {
    this.logger.debug("MIDI generated", event);
    this.emit("midi:generated", event);
  }

  private handleArrangementCompleted(event: any): void {
    this.logger.debug("Arrangement completed", event);
    this.emit("arrangement:completed", event);
  }
}

// ==================== Supporting Classes ====================
// (Abbreviated implementations for brevity)

class CompositionEngine extends EventEmitter {
  private config: CompositionEngineConfig;
  private logger: Logger;

  constructor(config: CompositionEngineConfig) {
    super();
    this.config = config;
    this.logger = new Logger("CompositionEngine");
  }

  async initialize(): Promise<void> {
    this.logger.info("Initializing composition engine");
  }

  async generateStructure(
    config: any,
    style: string,
    prompt?: string,
  ): Promise<any> {
    // Structure generation implementation
    return { sections: [] };
  }

  async generateHarmony(
    structure: any,
    config: any,
    constraints?: any,
  ): Promise<any> {
    // Harmony generation implementation
    return {};
  }

  async generateMelodies(
    structure: any,
    harmony: any,
    config: any,
  ): Promise<any> {
    // Melody generation implementation
    return {};
  }

  async generateRhythms(structure: any, config: any): Promise<any> {
    // Rhythm generation implementation
    return {};
  }

  async combineElements(
    structure: any,
    harmony: any,
    melodies: any,
    rhythms: any,
  ): Promise<any> {
    // Element combination implementation
    return {};
  }

  async generateScore(
    project: CompositionProject,
    options?: any,
  ): Promise<string> {
    // Score generation implementation
    return `/scores/${project.id}/score.pdf`;
  }
}

class MIDIEngine extends EventEmitter {
  private config: MIDIEngineConfig;
  private logger: Logger;

  constructor(config: MIDIEngineConfig) {
    super();
    this.config = config;
    this.logger = new Logger("MIDIEngine");
  }

  async initialize(): Promise<void> {
    this.logger.info("Initializing MIDI engine");
  }

  async generateTracks(
    composition: any,
    instruments: any[],
  ): Promise<CompositionTrack[]> {
    // MIDI track generation implementation
    return [];
  }

  async exportMIDI(
    project: CompositionProject,
    options?: any,
  ): Promise<string> {
    // MIDI export implementation
    return `/midi/${project.id}/composition.mid`;
  }
}

class OrchestrationEngine extends EventEmitter {
  private config: OrchestrationConfig;
  private logger: Logger;

  constructor(config: OrchestrationConfig) {
    super();
    this.config = config;
    this.logger = new Logger("OrchestrationEngine");
  }

  async initialize(): Promise<void> {
    this.logger.info("Initializing orchestration engine");
  }

  async analyzeEnsemble(ensemble: string[]): Promise<any> {
    // Ensemble analysis implementation
    return {};
  }

  async arrange(
    tracks: CompositionTrack[],
    ensembleConfig: any,
    config: any,
  ): Promise<CompositionTrack[]> {
    // Arrangement implementation
    return tracks;
  }

  async renderAudio(
    project: CompositionProject,
    options?: any,
  ): Promise<string> {
    // Audio rendering implementation
    return `/audio/${project.id}/composition.wav`;
  }
}

class MusicTheoryEngine {
  private config: MusicTheoryConfig;
  private logger: Logger;

  constructor(config: MusicTheoryConfig) {
    this.config = config;
    this.logger = new Logger("MusicTheoryEngine");
  }

  async initialize(): Promise<void> {
    this.logger.info("Initializing music theory engine");
  }

  async analyzeComposition(composition: any): Promise<CompositionAnalysis> {
    // Composition analysis implementation
    return await this.createEmptyAnalysis();
  }

  private async createEmptyAnalysis(): Promise<CompositionAnalysis> {
    // Return the same structure as in the main class
    return {} as CompositionAnalysis;
  }
}

class GenerationEngine {
  private config: GenerationConfig;
  private logger: Logger;

  constructor(config: GenerationConfig) {
    this.config = config;
    this.logger = new Logger("GenerationEngine");
  }

  async initialize(): Promise<void> {
    this.logger.info("Initializing generation engine");
  }
}

class PerformanceMonitor {
  private logger: Logger;

  constructor() {
    this.logger = new Logger("PerformanceMonitor");
  }

  async start(): Promise<void> {
    this.logger.info("Starting performance monitor");
  }

  async getMetrics(): Promise<PerformanceMetrics> {
    return {
      latency: { mean: 0, p50: 0, p95: 0, p99: 0, max: 0 },
      throughput: {
        requestsPerSecond: 0,
        bytesPerSecond: 0,
        operationsPerSecond: 0,
      },
      utilization: { cpu: 0, memory: 0, disk: 0, network: 0 },
      errors: { rate: 0, percentage: 0, types: {} },
    };
  }
}