/**
 * Shared Configuration Manager
 * Ensures configuration consistency across multiple instances using shared storage
 */
/**
 * Manages configuration consistency for shared storage
 */
export class SharedConfigManager {
    /**
     * Load or create shared configuration
     * When connecting to existing data, this OVERRIDES auto-configuration!
     */
    static async loadOrCreateSharedConfig(storage, localConfig) {
        const warnings = [];
        try {
            // Check if we're using shared storage
            if (!this.isSharedStorage(localConfig.storageType)) {
                // Local storage - use local config
                return { config: localConfig, warnings: [] };
            }
            // Try to load existing configuration from shared storage
            const existingConfig = await this.loadConfigFromStorage(storage);
            if (existingConfig) {
                // EXISTING SHARED DATA - Must use its configuration!
                console.log('📁 Found existing shared data configuration');
                // Check for critical mismatches
                const mismatches = this.checkCriticalMismatches(localConfig, existingConfig);
                if (mismatches.length > 0) {
                    console.warn('⚠️  Configuration override required for shared storage:');
                    mismatches.forEach(m => {
                        console.warn(`   - ${m.param}: ${m.local} → ${m.shared} (using shared)`);
                        warnings.push(`${m.param} overridden: ${m.local} → ${m.shared}`);
                    });
                }
                // Override critical parameters with shared values
                const mergedConfig = this.mergeWithSharedConfig(localConfig, existingConfig);
                // Update last accessed
                await this.updateAccessInfo(storage, existingConfig);
                return { config: mergedConfig, warnings };
            }
            else {
                // NEW SHARED STORAGE - Save our configuration
                console.log('📝 Initializing new shared storage with configuration');
                const sharedConfig = this.createSharedConfig(localConfig);
                await this.saveConfigToStorage(storage, sharedConfig);
                return { config: localConfig, warnings: [] };
            }
        }
        catch (error) {
            console.error('Failed to manage shared configuration:', error);
            warnings.push('Could not verify shared configuration - proceeding with caution');
            return { config: localConfig, warnings };
        }
    }
    /**
     * Check if storage type is shared (multi-instance)
     */
    static isSharedStorage(storageType) {
        return ['s3', 'gcs', 'r2'].includes(storageType);
    }
    /**
     * Load configuration from shared storage
     */
    static async loadConfigFromStorage(storage) {
        try {
            const configData = await storage.get(this.CONFIG_FILE);
            if (!configData)
                return null;
            const config = JSON.parse(configData);
            return config;
        }
        catch (error) {
            // Config doesn't exist yet
            return null;
        }
    }
    /**
     * Save configuration to shared storage
     */
    static async saveConfigToStorage(storage, config) {
        try {
            await storage.set(this.CONFIG_FILE, JSON.stringify(config, null, 2));
        }
        catch (error) {
            console.error('Failed to save shared configuration:', error);
            throw new Error('Cannot initialize shared storage without saving configuration');
        }
    }
    /**
     * Create shared configuration from local config
     */
    static createSharedConfig(localConfig) {
        return {
            version: '2.10.0', // Brainy version
            precision: localConfig.embeddingOptions?.precision || 'fp32',
            dimensions: 384, // Fixed for all-MiniLM-L6-v2
            hnswM: localConfig.hnsw?.M || 16,
            hnswEfConstruction: localConfig.hnsw?.efConstruction || 200,
            distanceFunction: localConfig.distanceFunction || 'cosine',
            createdAt: new Date().toISOString(),
            lastUpdated: new Date().toISOString(),
            instanceCount: 1,
            lastAccessedBy: this.getInstanceIdentifier()
        };
    }
    /**
     * Check for critical configuration mismatches
     */
    static checkCriticalMismatches(localConfig, sharedConfig) {
        const mismatches = [];
        // Model precision - CRITICAL!
        const localPrecision = localConfig.embeddingOptions?.precision || 'fp32';
        if (localPrecision !== sharedConfig.precision) {
            mismatches.push({
                param: 'Model Precision',
                local: localPrecision,
                shared: sharedConfig.precision
            });
        }
        // HNSW parameters - Important for index consistency
        const localM = localConfig.hnsw?.M || 16;
        if (localM !== sharedConfig.hnswM) {
            mismatches.push({
                param: 'HNSW M',
                local: localM,
                shared: sharedConfig.hnswM
            });
        }
        const localEf = localConfig.hnsw?.efConstruction || 200;
        if (localEf !== sharedConfig.hnswEfConstruction) {
            mismatches.push({
                param: 'HNSW efConstruction',
                local: localEf,
                shared: sharedConfig.hnswEfConstruction
            });
        }
        // Distance function
        const localDistance = localConfig.distanceFunction || 'cosine';
        if (localDistance !== sharedConfig.distanceFunction) {
            mismatches.push({
                param: 'Distance Function',
                local: localDistance,
                shared: sharedConfig.distanceFunction
            });
        }
        return mismatches;
    }
    /**
     * Merge local config with shared config (shared takes precedence for critical params)
     */
    static mergeWithSharedConfig(localConfig, sharedConfig) {
        return {
            ...localConfig,
            // Override critical parameters with shared values
            embeddingOptions: {
                ...localConfig.embeddingOptions,
                precision: sharedConfig.precision // MUST use shared precision!
            },
            hnsw: {
                ...localConfig.hnsw,
                M: sharedConfig.hnswM,
                efConstruction: sharedConfig.hnswEfConstruction
            },
            distanceFunction: sharedConfig.distanceFunction,
            // Add metadata about shared configuration
            _sharedConfig: {
                loaded: true,
                version: sharedConfig.version,
                createdAt: sharedConfig.createdAt,
                precision: sharedConfig.precision
            }
        };
    }
    /**
     * Update access information in shared config
     */
    static async updateAccessInfo(storage, config) {
        try {
            config.lastUpdated = new Date().toISOString();
            config.instanceCount = (config.instanceCount || 0) + 1;
            config.lastAccessedBy = this.getInstanceIdentifier();
            await this.saveConfigToStorage(storage, config);
        }
        catch {
            // Non-critical - don't fail if we can't update access info
        }
    }
    /**
     * Get unique identifier for this instance
     */
    static getInstanceIdentifier() {
        if (process.env.HOSTNAME)
            return process.env.HOSTNAME;
        if (process.env.CONTAINER_ID)
            return process.env.CONTAINER_ID;
        if (process.env.K_SERVICE)
            return process.env.K_SERVICE;
        if (process.env.AWS_LAMBDA_FUNCTION_NAME)
            return process.env.AWS_LAMBDA_FUNCTION_NAME;
        // Generate a random identifier
        return `instance-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
    }
    /**
     * Validate that a configuration is compatible with shared data
     */
    static validateCompatibility(config1, config2) {
        return (config1.precision === config2.precision &&
            config1.dimensions === config2.dimensions &&
            config1.hnswM === config2.hnswM &&
            config1.hnswEfConstruction === config2.hnswEfConstruction &&
            config1.distanceFunction === config2.distanceFunction);
    }
}
SharedConfigManager.CONFIG_FILE = '.brainy/config.json';
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