/**
 * TTS (Text-to-Speech) Types
 */
/** Built-in provider ids shipped in core. Extensions add more at runtime. */
export type BuiltinTTSProvider = 'openai' | 'alibaba' | 'edge' | 'minimax' | 'tts-local-cli';
/** Any registered SpeechProviderPlugin id (built-in or extension). */
export type TTSProvider = string;
export type TTSAutoMode = 'off' | 'always' | 'inbound' | 'tagged';
export interface TTSOptions {
    /** Voice ID */
    voice?: string;
    /** Speed (0.25 - 4.0) */
    speed?: number;
    /** Output format */
    format?: 'opus' | 'mp3' | 'wav';
    /** Model ID (for provider-specific model selection) */
    model?: string;
    /** Request timeout in milliseconds */
    timeoutMs?: number;
}
export interface TTSResult {
    /** Audio buffer */
    audio: Buffer;
    /** Format */
    format: string;
    /** Duration in seconds (if available) */
    duration?: number;
    /** Provider that generated the speech */
    provider: string;
}
export interface TTSProviderInterface {
    /** Provider name */
    name: string;
    /** Convert text to speech */
    speak(text: string, options?: TTSOptions): Promise<TTSResult>;
    /** Check if provider is configured */
    isConfigured(): boolean;
}
export interface TTSModelOverrideConfig {
    /** Enable model-provided overrides for TTS */
    enabled?: boolean;
    /** Allow model-provided TTS text blocks */
    allowText?: boolean;
    /** Allow model-provided provider override (default: false) */
    allowProvider?: boolean;
    /** Allow model-provided voice/voiceId override */
    allowVoice?: boolean;
    /** Allow model-provided modelId override */
    allowModelId?: boolean;
    /** Allow model-provided voice settings override */
    allowVoiceSettings?: boolean;
    /** Allow model-provided normalization or language overrides */
    allowNormalization?: boolean;
    /** Allow model-provided seed override */
    allowSeed?: boolean;
}
export interface TTSConfig {
    enabled: boolean;
    provider: TTSProvider;
    /** Trigger mode for automatic voice replies. */
    trigger: TTSAutoMode;
    /** Fallback configuration */
    fallback?: {
        enabled: boolean;
        order: TTSProvider[];
    };
    /** Maximum text length for TTS */
    maxTextLength?: number;
    /** API request timeout (ms) */
    timeoutMs?: number;
    /** Long-text summarization before TTS */
    summarization?: TTSSummarizationConfig;
    /** Allow model to override TTS parameters */
    modelOverrides?: TTSModelOverrideConfig;
    /** Provider settings map (`messages.tts.providers.<id>`). */
    providers?: Record<string, Record<string, unknown>>;
}
export interface TTSSummarizationConfig {
    /** When true (default), long text is summarized via LLM before TTS */
    enabled?: boolean;
    targetLength?: number;
    threshold?: number;
    model?: string;
}
export declare const DEFAULT_TTS_CONFIG: TTSConfig;
/** TTS directive parse result */
export interface TtsDirectiveParseResult {
    cleanedText: string;
    ttsText?: string;
    hasDirective: boolean;
    overrides: TtsDirectiveOverrides;
    warnings: string[];
}
/** TTS directive overrides */
export interface TtsDirectiveOverrides {
    ttsText?: string;
    provider?: TTSProvider;
    openai?: {
        voice?: string;
        model?: string;
    };
    alibaba?: {
        voice?: string;
        model?: string;
    };
    edge?: {
        voice?: string;
    };
    minimax?: {
        voice?: string;
        model?: string;
    };
}
/** Provider attempt result (TTS fallback chain) */
export type ProviderAttemptTask = 'success' | 'skipped' | 'failed';
/** Provider failure reason classification */
export type ProviderFailureReason = 'success' | 'not_configured' | 'timeout' | 'provider_error' | 'text_too_long' | 'unknown';
/** Single provider attempt in a TTS fallback chain */
export interface ProviderAttempt {
    provider: string;
    task: ProviderAttemptTask;
    reasonCode: ProviderFailureReason;
    latencyMs: number;
    error?: string;
}
/** TTS result including fallback / preprocessing metadata */
export interface TTSResultWithTracking extends TTSResult {
    attempts: ProviderAttempt[];
    fallbackFrom?: string;
    attemptedProviders: string[];
    wasPreprocessed?: boolean;
    ttsText?: string;
    wasSummarized?: boolean;
}
/** Last TTS call diagnostics (memory-only) */
export interface TtsStatusEntry {
    timestamp: number;
    success: boolean;
    provider?: string;
    latencyMs?: number;
    error?: string;
    textLength?: number;
    audioSize?: number;
    audioFormat?: string;
    usedFallback?: boolean;
    wasSummarized?: boolean;
}
export interface TtsRuntimeStatus {
    lastAttempt?: TtsStatusEntry;
    recentSuccessRate?: number;
    totalCalls: number;
    totalSuccesses: number;
    totalFailures: number;
}