managarten/apps/reader/apps/mobile/utils/audioMigration.ts

import { TextData, AudioVersion } from '~/types/database';

/**
 * Migriert alte Audio-Daten zum neuen audioVersions Format
 */
export function migrateAudioData(data: TextData): TextData {
	// Wenn bereits audioVersions existiert, keine Migration nötig
	if (data.audioVersions && data.audioVersions.length > 0) {
		return data;
	}

	// Wenn alte audio Daten existieren, migriere sie
	if (data.audio && data.audio.chunks && data.audio.chunks.length > 0) {
		const versionId = `v1-${data.audio.lastGenerated ? new Date(data.audio.lastGenerated).getTime() : Date.now()}`;
		const audioVersion: AudioVersion = {
			id: versionId,
			chunks: data.audio.chunks,
			settings: data.audio.settings || {
				voice: data.tts?.voice || 'de-DE-Neural2-A',
				speed: data.tts?.speed || 1,
			},
			totalSize: data.audio.totalSize,
			hasLocalCache: data.audio.hasLocalCache,
			createdAt: data.audio.lastGenerated || new Date().toISOString(),
		};

		return {
			...data,
			audioVersions: [audioVersion],
			currentAudioVersion: versionId,
		};
	}

	// Keine Audio-Daten vorhanden
	return data;
}

/**
 * Holt die aktuelle Audio-Version basierend auf currentAudioVersion
 */
export function getCurrentAudioVersion(data: TextData): AudioVersion | null {
	if (!data.audioVersions || data.audioVersions.length === 0) {
		return null;
	}

	if (data.currentAudioVersion) {
		const version = data.audioVersions.find((v) => v.id === data.currentAudioVersion);
		if (version) return version;
	}

	// Fallback: nimm die neueste Version
	return data.audioVersions[data.audioVersions.length - 1];
}

/**
 * Generiert eine neue Versions-ID
 */
export function generateVersionId(): string {
	return `v${Date.now()}`;
}