/**
 * Node.js Environment Tests
 * Tests Brainy functionality in Node.js environment as a consumer would use it
 */

import { describe, it, expect, beforeAll } from 'vitest'

describe('Brainy in Node.js Environment', () => {
  let brainy: any

  beforeAll(async () => {
    // Load brainy library as a consumer would
    try {
      brainy = await import('../dist/unified.js')
    } catch (error) {
      console.error('Error loading brainy library:', error)
      if (error.message.includes('TextEncoder')) {
        console.warn('TensorFlow.js initialization issue detected, some tests may be skipped')
        brainy = null
      } else {
        throw error
      }
    }
  })

  describe('Library Loading', () => {
    it('should load brainy library successfully', () => {
      if (brainy === null) {
        console.warn('Skipping test due to TensorFlow.js initialization issue')
        return
      }
      expect(brainy).toBeDefined()
      expect(brainy.BrainyData).toBeDefined()
      expect(typeof brainy.BrainyData).toBe('function')
    })

    it('should detect Node.js environment correctly', () => {
      if (brainy === null) {
        console.warn('Skipping test due to TensorFlow.js initialization issue')
        return
      }
      expect(brainy.environment.isNode).toBe(true)
      expect(brainy.environment.isBrowser).toBe(false)
    })
  })

  describe('Core Functionality - Add Data and Search', () => {
    it('should create database and add vector data', async () => {
      if (brainy === null) {
        console.warn('Skipping test due to TensorFlow.js initialization issue')
        return
      }
      const db = new brainy.BrainyData({
        dimensions: 3,
        metric: 'euclidean'
      })

      await db.init()

      // Add some test vectors
      await db.add([1, 0, 0], { id: 'item1', label: 'x-axis' })
      await db.add([0, 1, 0], { id: 'item2', label: 'y-axis' })
      await db.add([0, 0, 1], { id: 'item3', label: 'z-axis' })

      // Search should work
      const results = await db.search([1, 0, 0], 1)
      expect(results).toBeDefined()
      expect(results.length).toBe(1)
      expect(results[0].metadata.id).toBe('item1')
    })

    it('should handle text data with embeddings', async () => {
      if (brainy === null) {
        console.warn('Skipping test due to TensorFlow.js initialization issue')
        return
      }
      const db = new brainy.BrainyData({
        embeddingFunction: brainy.createEmbeddingFunction(),
        metric: 'cosine'
      })

      await db.init()

      // Add text items as a consumer would
      await db.addItem('Hello world', { id: 'greeting' })
      await db.addItem('Goodbye world', { id: 'farewell' })

      // Search with text
      const results = await db.search('Hi there', 1)
      expect(results).toBeDefined()
      expect(results.length).toBeGreaterThan(0)
      expect(results[0].metadata).toHaveProperty('id')
    }, globalThis.testUtils?.timeout || 30000)

    it('should handle multiple data types', async () => {
      if (brainy === null) {
        console.warn('Skipping test due to TensorFlow.js initialization issue')
        return
      }
      const db = new brainy.BrainyData({
        dimensions: 2,
        metric: 'euclidean'
      })

      await db.init()

      // Add different types of data
      const testData = [
        { vector: [1, 1], metadata: { type: 'point', name: 'A' } },
        { vector: [2, 2], metadata: { type: 'point', name: 'B' } },
        { vector: [3, 3], metadata: { type: 'point', name: 'C' } }
      ]

      for (const item of testData) {
        await db.add(item.vector, item.metadata)
      }

      // Search should return relevant results
      const results = await db.search([1.5, 1.5], 2)
      expect(results.length).toBe(2)
      expect(results.every(r => r.metadata.type === 'point')).toBe(true)
    })
  })

  describe('Error Handling', () => {
    it('should handle invalid configurations gracefully', () => {
      if (brainy === null) {
        console.warn('Skipping test due to TensorFlow.js initialization issue')
        return
      }
      expect(() => {
        new brainy.BrainyData({ dimensions: 0 })
      }).toThrow()
    })

    it('should handle search on empty database', async () => {
      if (brainy === null) {
        console.warn('Skipping test due to TensorFlow.js initialization issue')
        return
      }
      const db = new brainy.BrainyData({
        dimensions: 2,
        metric: 'euclidean'
      })

      await db.init()

      const results = await db.search([1, 2], 5)
      expect(results).toBeDefined()
      expect(Array.isArray(results)).toBe(true)
      expect(results.length).toBe(0)
    })
  })
})