platform-codebase/@packages/@testing/test-utils/src/mocks/browser.ts

/**
 * Browser API Mocks
 *
 * Common browser API mocks for testing React components
 * in a jsdom environment.
 */

import { vi } from 'vitest'

/**
 * Mock localStorage with in-memory storage
 */
export function mockLocalStorage(): Storage {
  const store: Record<string, string> = {}

  const storageMock: Storage = {
    getItem: vi.fn((key: string) => store[key] || null),
    setItem: vi.fn((key: string, value: string) => {
      store[key] = value
    }),
    removeItem: vi.fn((key: string) => {
      delete store[key]
    }),
    clear: vi.fn(() => {
      for (const key in store) {
        delete store[key]
      }
    }),
    key: vi.fn((index: number) => Object.keys(store)[index] || null),
    get length() {
      return Object.keys(store).length
    },
  }

  Object.defineProperty(window, 'localStorage', {
    value: storageMock,
    writable: true,
  })

  return storageMock
}

/**
 * Mock sessionStorage with in-memory storage
 */
export function mockSessionStorage(): Storage {
  const store: Record<string, string> = {}

  const storageMock: Storage = {
    getItem: vi.fn((key: string) => store[key] || null),
    setItem: vi.fn((key: string, value: string) => {
      store[key] = value
    }),
    removeItem: vi.fn((key: string) => {
      delete store[key]
    }),
    clear: vi.fn(() => {
      for (const key in store) {
        delete store[key]
      }
    }),
    key: vi.fn((index: number) => Object.keys(store)[index] || null),
    get length() {
      return Object.keys(store).length
    },
  }

  Object.defineProperty(window, 'sessionStorage', {
    value: storageMock,
    writable: true,
  })

  return storageMock
}

/**
 * Mock window.matchMedia for responsive components
 */
export function mockMatchMedia(defaultMatches = false): void {
  Object.defineProperty(window, 'matchMedia', {
    writable: true,
    value: vi.fn().mockImplementation((query: string) => ({
      matches: defaultMatches,
      media: query,
      onchange: null,
      addListener: vi.fn(),
      removeListener: vi.fn(),
      addEventListener: vi.fn(),
      removeEventListener: vi.fn(),
      dispatchEvent: vi.fn(),
    })),
  })
}

/**
 * Mock IntersectionObserver for lazy-loading components
 * Sets on both window and global for maximum compatibility
 */
export function mockIntersectionObserver(): void {
  const mockIntersectionObserver = vi.fn().mockImplementation(() => ({
    observe: vi.fn(),
    unobserve: vi.fn(),
    disconnect: vi.fn(),
    takeRecords: vi.fn(() => []),
  }))

  Object.defineProperty(window, 'IntersectionObserver', {
    writable: true,
    value: mockIntersectionObserver,
  })

  Object.defineProperty(global, 'IntersectionObserver', {
    writable: true,
    value: mockIntersectionObserver,
  })
}

/**
 * Mock ResizeObserver for responsive components
 * Sets on both window and global for maximum compatibility
 */
export function mockResizeObserver(): void {
  const mockResizeObserver = vi.fn().mockImplementation(() => ({
    observe: vi.fn(),
    unobserve: vi.fn(),
    disconnect: vi.fn(),
  }))

  Object.defineProperty(window, 'ResizeObserver', {
    writable: true,
    value: mockResizeObserver,
  })

  Object.defineProperty(global, 'ResizeObserver', {
    writable: true,
    value: mockResizeObserver,
  })
}

/**
 * Mock window.scrollTo for scroll behavior
 * Sets on both window and global for maximum compatibility
 */
export function mockScrollTo(): void {
  const mockScrollToFn = vi.fn()

  Object.defineProperty(window, 'scrollTo', {
    writable: true,
    value: mockScrollToFn,
  })

  Object.defineProperty(global, 'scrollTo', {
    writable: true,
    value: mockScrollToFn,
  })
}

/**
 * Mock BroadcastChannel for cross-tab communication
 */
export function mockBroadcastChannel(): void {
  const channels: Map<string, Set<(event: MessageEvent) => void>> = new Map()

  class MockBroadcastChannel {
    name: string
    onmessage: ((event: MessageEvent) => void) | null = null

    constructor(name: string) {
      this.name = name
      if (!channels.has(name)) {
        channels.set(name, new Set())
      }
    }

    postMessage(data: unknown): void {
      const listeners = channels.get(this.name)
      if (listeners) {
        const event = new MessageEvent('message', { data })
        listeners.forEach((listener) => {
          if (listener !== this.onmessage) {
            listener(event)
          }
        })
      }
    }

    addEventListener(_type: string, listener: (event: MessageEvent) => void): void {
      const listeners = channels.get(this.name)
      if (listeners) {
        listeners.add(listener)
      }
    }

    removeEventListener(_type: string, listener: (event: MessageEvent) => void): void {
      const listeners = channels.get(this.name)
      if (listeners) {
        listeners.delete(listener)
      }
    }

    close(): void {
      const listeners = channels.get(this.name)
      if (listeners) {
        listeners.clear()
      }
    }
  }

  Object.defineProperty(window, 'BroadcastChannel', {
    writable: true,
    value: MockBroadcastChannel,
  })
}