/**
 * Unified Embedding Manager
 *
 * THE single source of truth for all embedding operations in Brainy.
 * Combines model management, precision configuration, and embedding generation
 * into one clean, maintainable class.
 *
 * Features:
 * - Singleton pattern ensures ONE model instance
 * - Automatic Q8 (default) or FP32 precision
 * - Model downloading and caching
 * - Thread-safe initialization
 * - Memory monitoring
 *
 * This replaces: SingletonModelManager, TransformerEmbedding, ModelPrecisionManager,
 * hybridModelManager, universalMemoryManager, and more.
 */
import { pipeline, env } from '@huggingface/transformers';
import { existsSync } from 'fs';
import { join } from 'path';
// Global state for true singleton across entire process
let globalInstance = null;
let globalInitPromise = null;
/**
 * Unified Embedding Manager - Clean, simple, reliable
 */
export class EmbeddingManager {
    constructor() {
        this.model = null;
        this.modelName = 'Xenova/all-MiniLM-L6-v2';
        this.initialized = false;
        this.initTime = null;
        this.embedCount = 0;
        this.locked = false;
        // Determine precision - Q8 by default
        this.precision = this.determinePrecision();
        console.log(`🎯 EmbeddingManager: Using ${this.precision.toUpperCase()} precision`);
    }
    /**
     * Get the singleton instance
     */
    static getInstance() {
        if (!globalInstance) {
            globalInstance = new EmbeddingManager();
        }
        return globalInstance;
    }
    /**
     * Initialize the model (happens once)
     */
    async init() {
        // In unit test mode, skip real model initialization
        if (process.env.BRAINY_UNIT_TEST === 'true' || globalThis.__BRAINY_UNIT_TEST__) {
            if (!this.initialized) {
                this.initialized = true;
                this.initTime = 1; // Mock init time
                console.log('🧪 EmbeddingManager: Using mocked embeddings for unit tests');
            }
            return;
        }
        // Already initialized
        if (this.initialized && this.model) {
            return;
        }
        // Initialization in progress
        if (globalInitPromise) {
            await globalInitPromise;
            return;
        }
        // Start initialization
        globalInitPromise = this.performInit();
        try {
            await globalInitPromise;
        }
        finally {
            globalInitPromise = null;
        }
    }
    /**
     * Perform actual initialization
     */
    async performInit() {
        const startTime = Date.now();
        console.log(`🚀 Initializing embedding model (${this.precision.toUpperCase()})...`);
        try {
            // Configure transformers.js environment
            const modelsPath = this.getModelsPath();
            env.cacheDir = modelsPath;
            env.allowLocalModels = true;
            env.useFSCache = true;
            // Check if models exist locally
            const modelPath = join(modelsPath, ...this.modelName.split('/'));
            const hasLocalModels = existsSync(modelPath);
            if (hasLocalModels) {
                console.log('✅ Using cached models from:', modelPath);
            }
            // Configure pipeline options for the selected precision
            const pipelineOptions = {
                cache_dir: modelsPath,
                local_files_only: false,
                // Specify precision
                dtype: this.precision,
                quantized: this.precision === 'q8',
                // Memory optimizations
                session_options: {
                    enableCpuMemArena: false,
                    enableMemPattern: false,
                    interOpNumThreads: 1,
                    intraOpNumThreads: 1,
                    graphOptimizationLevel: 'disabled'
                }
            };
            // Load the model
            this.model = await pipeline('feature-extraction', this.modelName, pipelineOptions);
            // Lock precision after successful initialization
            this.locked = true;
            this.initialized = true;
            this.initTime = Date.now() - startTime;
            // Log success
            const memoryMB = this.getMemoryUsage();
            console.log(`✅ Model loaded in ${this.initTime}ms`);
            console.log(`📊 Precision: ${this.precision.toUpperCase()} | Memory: ${memoryMB}MB`);
            console.log(`🔒 Configuration locked`);
        }
        catch (error) {
            this.initialized = false;
            this.model = null;
            throw new Error(`Failed to initialize embedding model: ${error instanceof Error ? error.message : String(error)}`);
        }
    }
    /**
     * Generate embeddings
     */
    async embed(text) {
        // Check for unit test environment - use mocks to prevent ONNX conflicts
        if (process.env.BRAINY_UNIT_TEST === 'true' || globalThis.__BRAINY_UNIT_TEST__) {
            return this.getMockEmbedding(text);
        }
        // Ensure initialized
        await this.init();
        if (!this.model) {
            throw new Error('Model not initialized');
        }
        // Handle array input
        const input = Array.isArray(text) ? text.join(' ') : text;
        // Generate embedding
        const output = await this.model(input, {
            pooling: 'mean',
            normalize: true
        });
        // Extract embedding vector
        const embedding = Array.from(output.data);
        // Validate dimensions
        if (embedding.length !== 384) {
            console.warn(`Unexpected embedding dimension: ${embedding.length}`);
            // Pad or truncate
            if (embedding.length < 384) {
                return [...embedding, ...new Array(384 - embedding.length).fill(0)];
            }
            else {
                return embedding.slice(0, 384);
            }
        }
        this.embedCount++;
        return embedding;
    }
    /**
     * Generate mock embeddings for unit tests
     */
    getMockEmbedding(text) {
        // Use the same mock logic as setup-unit.ts for consistency
        const input = Array.isArray(text) ? text.join(' ') : text;
        const str = typeof input === 'string' ? input : JSON.stringify(input);
        const vector = new Array(384).fill(0);
        // Create semi-realistic embeddings based on text content
        for (let i = 0; i < Math.min(str.length, 384); i++) {
            vector[i] = (str.charCodeAt(i % str.length) % 256) / 256;
        }
        // Add position-based variation
        for (let i = 0; i < 384; i++) {
            vector[i] += Math.sin(i * 0.1 + str.length) * 0.1;
        }
        // Track mock embedding count
        this.embedCount++;
        return vector;
    }
    /**
     * Get embedding function for compatibility
     */
    getEmbeddingFunction() {
        return async (data) => {
            return await this.embed(data);
        };
    }
    /**
     * Determine model precision
     */
    determinePrecision() {
        // Check environment variable overrides
        if (process.env.BRAINY_MODEL_PRECISION === 'fp32') {
            return 'fp32';
        }
        if (process.env.BRAINY_MODEL_PRECISION === 'q8') {
            return 'q8';
        }
        if (process.env.BRAINY_FORCE_FP32 === 'true') {
            return 'fp32';
        }
        // Default to Q8 - optimal for most use cases
        return 'q8';
    }
    /**
     * Get models directory path
     */
    getModelsPath() {
        // Check various possible locations
        const paths = [
            process.env.BRAINY_MODELS_PATH,
            './models',
            join(process.cwd(), 'models'),
            join(process.env.HOME || '', '.brainy', 'models')
        ];
        for (const path of paths) {
            if (path && existsSync(path)) {
                return path;
            }
        }
        // Default
        return join(process.cwd(), 'models');
    }
    /**
     * Get memory usage in MB
     */
    getMemoryUsage() {
        if (typeof process !== 'undefined' && process.memoryUsage) {
            const usage = process.memoryUsage();
            return Math.round(usage.heapUsed / 1024 / 1024);
        }
        return null;
    }
    /**
     * Get current statistics
     */
    getStats() {
        return {
            initialized: this.initialized,
            precision: this.precision,
            modelName: this.modelName,
            embedCount: this.embedCount,
            initTime: this.initTime,
            memoryMB: this.getMemoryUsage()
        };
    }
    /**
     * Check if initialized
     */
    isInitialized() {
        return this.initialized;
    }
    /**
     * Get current precision
     */
    getPrecision() {
        return this.precision;
    }
    /**
     * Validate precision matches expected
     */
    validatePrecision(expected) {
        if (this.locked && expected !== this.precision) {
            throw new Error(`Precision mismatch! System using ${this.precision.toUpperCase()} ` +
                `but ${expected.toUpperCase()} was requested. Cannot mix precisions.`);
        }
    }
}
// Export singleton instance and convenience functions
export const embeddingManager = EmbeddingManager.getInstance();
/**
 * Direct embed function
 */
export async function embed(text) {
    return await embeddingManager.embed(text);
}
/**
 * Get embedding function for compatibility
 */
export function getEmbeddingFunction() {
    return embeddingManager.getEmbeddingFunction();
}
/**
 * Get statistics
 */
export function getEmbeddingStats() {
    return embeddingManager.getStats();
}
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