import {
  openDB,
  getAllSnippets,
  getSnippet,
  createSnippet,
  updateSnippet,
  deleteSnippet,
  getAllNamespaces,
  createNamespace,
  deleteNamespace,
  wipeDatabase,
  getSnippetsByNamespace,
  getNamespace,
  clearDatabase
} from './indexeddb-storage'
import type { Snippet, Namespace } from './types'

/**
 * IndexedDB Storage Tests
 *
 * Note: Full end-to-end testing of IndexedDB requires a real browser environment.
 * These tests focus on validating the API structure and basic mock setup.
 * Integration tests should be run in a browser environment or with an IndexedDB polyfill.
 */

const mockObjectStore = {
  add: jest.fn(),
  put: jest.fn(),
  get: jest.fn(),
  delete: jest.fn(),
  getAll: jest.fn(),
  clear: jest.fn(),
  createIndex: jest.fn(),
  index: jest.fn()
}

const mockTransaction = {
  objectStore: jest.fn(() => mockObjectStore),
  onerror: null,
  oncomplete: null
}

const mockDatabase = {
  transaction: jest.fn(() => mockTransaction),
  createObjectStore: jest.fn(),
  objectStoreNames: {
    contains: jest.fn(() => true)
  },
  close: jest.fn()
}

function createSuccessRequest(result: any) {
  const request = {
    result,
    error: null,
    _onsuccess: null as any,
    _onerror: null as any,
    onupgradeneeded: null,
    get onsuccess() {
      return this._onsuccess
    },
    set onsuccess(fn: any) {
      this._onsuccess = fn
      if (fn) {
        // Schedule the callback in next microtask
        Promise.resolve().then(() => fn({ target: this }))
      }
    },
    get onerror() {
      return this._onerror
    },
    set onerror(fn: any) {
      this._onerror = fn
    }
  } as any

  return request
}

const mockRequest = createSuccessRequest(mockDatabase)

global.indexedDB = {
  open: jest.fn(() => mockRequest)
} as any

describe('IndexedDB Storage', () => {
  beforeEach(() => {
    jest.clearAllMocks()
    mockObjectStore.add.mockClear()
    mockObjectStore.put.mockClear()
    mockObjectStore.get.mockClear()
    mockObjectStore.delete.mockClear()
    mockObjectStore.getAll.mockClear()
    mockObjectStore.clear.mockClear()
    mockTransaction.objectStore.mockReturnValue(mockObjectStore)
    mockDatabase.transaction.mockReturnValue(mockTransaction)
    ;(global.indexedDB.open as any).mockReturnValue(mockRequest)
  })

  describe('openDB', () => {
    it('should initialize database correctly', () => {
      expect(global.indexedDB.open).toBeDefined()
      expect(mockDatabase).toBeDefined()
      expect(mockDatabase.transaction).toBeDefined()
    })

    it('should define transaction method', () => {
      expect(typeof mockDatabase.transaction).toBe('function')
    })

    it('should have createObjectStore method', () => {
      expect(typeof mockDatabase.createObjectStore).toBe('function')
    })
  })

  describe('Snippet Operations', () => {
    it('should have add method for creating snippets', () => {
      expect(typeof mockObjectStore.add).toBe('function')
    })

    it('should have put method for updating snippets', () => {
      expect(typeof mockObjectStore.put).toBe('function')
    })

    it('should have get method for fetching snippets', () => {
      expect(typeof mockObjectStore.get).toBe('function')
    })

    it('should have delete method for removing snippets', () => {
      expect(typeof mockObjectStore.delete).toBe('function')
    })

    it('should have getAll method for fetching all snippets', () => {
      expect(typeof mockObjectStore.getAll).toBe('function')
    })

    it('should support createIndex for indexing', () => {
      expect(typeof mockObjectStore.createIndex).toBe('function')
    })
  })

  describe('Namespace Operations', () => {
    it('should have methods for namespace management', () => {
      expect(mockTransaction.objectStore).toBeDefined()
      expect(mockDatabase.transaction).toBeDefined()
    })

    it('should support creating object stores', () => {
      expect(typeof mockDatabase.createObjectStore).toBe('function')
    })

    it('should check object store existence', () => {
      expect(typeof mockDatabase.objectStoreNames.contains).toBe('function')
    })
  })

  describe('Request Handling', () => {
    it('should handle success callbacks', () => {
      const testRequest = createSuccessRequest({ test: 'data' })
      const callback = jest.fn()

      testRequest.onsuccess = callback

      // Give it a tick for the Promise to resolve
      return Promise.resolve().then(() => {
        expect(callback).toHaveBeenCalled()
      })
    })

    it('should handle error callbacks', () => {
      const testRequest = createSuccessRequest(null)
      const errorCallback = jest.fn()

      testRequest.onerror = errorCallback

      expect(typeof testRequest.onerror).toBe('function')
    })

    it('should preserve result on request', () => {
      const testData = { id: 'test', value: 'data' }
      const testRequest = createSuccessRequest(testData)

      expect(testRequest.result).toBe(testData)
    })
  })

  describe('Transaction Operations', () => {
    it('should get object store from transaction', () => {
      const store = mockTransaction.objectStore('snippets')
      expect(store).toBe(mockObjectStore)
    })

    it('should support multiple store accesses', () => {
      const store1 = mockTransaction.objectStore('snippets')
      const store2 = mockTransaction.objectStore('namespaces')

      expect(mockTransaction.objectStore).toHaveBeenCalledTimes(2)
      expect(store1).toBeDefined()
      expect(store2).toBeDefined()
    })
  })

  describe('Data Structure Validation', () => {
    it('should validate snippet structure', () => {
      const snippet: Snippet = {
        id: 'test-1',
        title: 'Test Snippet',
        code: 'const x = 1;',
        language: 'javascript',
        category: 'test',
        description: 'Test description',
        createdAt: Date.now(),
        updatedAt: Date.now()
      }

      expect(snippet.id).toBeDefined()
      expect(snippet.title).toBeDefined()
      expect(snippet.code).toBeDefined()
      expect(snippet.language).toBeDefined()
    })

    it('should validate namespace structure', () => {
      const namespace: Namespace = {
        id: 'ns-1',
        name: 'Test Namespace',
        createdAt: Date.now(),
        isDefault: false
      }

      expect(namespace.id).toBeDefined()
      expect(namespace.name).toBeDefined()
      expect(typeof namespace.isDefault).toBe('boolean')
    })
  })

  describe('Mock Setup Verification', () => {
    it('should have proper mock database setup', () => {
      expect(mockDatabase).toBeDefined()
      expect(mockDatabase.transaction).toBeDefined()
      expect(mockDatabase.createObjectStore).toBeDefined()
      expect(mockDatabase.close).toBeDefined()
    })

    it('should have proper mock transaction setup', () => {
      expect(mockTransaction).toBeDefined()
      expect(mockTransaction.objectStore).toBeDefined()
    })

    it('should have proper mock object store setup', () => {
      expect(mockObjectStore).toBeDefined()
      expect(mockObjectStore.add).toBeDefined()
      expect(mockObjectStore.put).toBeDefined()
      expect(mockObjectStore.get).toBeDefined()
      expect(mockObjectStore.delete).toBeDefined()
      expect(mockObjectStore.getAll).toBeDefined()
      expect(mockObjectStore.clear).toBeDefined()
    })

    it('should properly reset mocks between tests', () => {
      expect(mockObjectStore.add).not.toHaveBeenCalled()
      expect(mockObjectStore.put).not.toHaveBeenCalled()
      expect(mockObjectStore.get).not.toHaveBeenCalled()
    })
  })
})
