import React from 'react'
import { render, fireEvent } from '@testing-library/react-native'

import { MessageTabBar, TAB_ITEMS } from './MessageTabBar'
import type { MessageType } from './MessageTabBar'

describe('MessageTabBar Constants', () => {
  describe('TAB_ITEMS', () => {
    it('should have 4 tabs', () => {
      expect(TAB_ITEMS).toHaveLength(4)
    })

    it('should have correct tab keys', () => {
      const keys = TAB_ITEMS.map((tab) => tab.key)
      expect(keys).toEqual(['all', 'activity', 'system', 'billing'])
    })

    it('should have correct tab labels', () => {
      const labels = TAB_ITEMS.map((tab) => tab.label)
      expect(labels).toEqual(['全部', '互动', '系统', '账单'])
    })

    it('should have correct tab types', () => {
      const types = TAB_ITEMS.map((tab) => tab.type)
      expect(types).toEqual([undefined, 'ACTIVITY', 'SYSTEM', 'BILLING'])
    })
  })
})

describe('MessageTabBar Component', () => {
  const mockOnTabChange = jest.fn()

  beforeEach(() => {
    jest.clearAllMocks()
  })

  describe('Rendering', () => {
    it('should render all 4 tabs', () => {
      const { getByText } = render(
        <MessageTabBar activeTab={undefined} onTabChange={mockOnTabChange} />
      )

      expect(getByText('全部')).toBeTruthy()
      expect(getByText('互动')).toBeTruthy()
      expect(getByText('系统')).toBeTruthy()
      expect(getByText('账单')).toBeTruthy()
    })

    it('should render with testID for each tab', () => {
      const { getByTestId } = render(
        <MessageTabBar activeTab={undefined} onTabChange={mockOnTabChange} />
      )

      expect(getByTestId('tab-all')).toBeTruthy()
      expect(getByTestId('tab-activity')).toBeTruthy()
      expect(getByTestId('tab-system')).toBeTruthy()
      expect(getByTestId('tab-billing')).toBeTruthy()
    })
  })

  describe('Active Tab Highlighting', () => {
    it('should highlight "全部" tab when activeTab is undefined', () => {
      const { getByTestId } = render(
        <MessageTabBar activeTab={undefined} onTabChange={mockOnTabChange} />
      )

      const allTab = getByTestId('tab-all')
      const activityTab = getByTestId('tab-activity')

      // Check that all tab has active indicator
      expect(getByTestId('tab-all-active-indicator')).toBeTruthy()
      // Check that activity tab does not have active indicator
      expect(() => getByTestId('tab-activity-active-indicator')).toThrow()
    })

    it('should highlight "互动" tab when activeTab is ACTIVITY', () => {
      const { getByTestId } = render(
        <MessageTabBar activeTab="ACTIVITY" onTabChange={mockOnTabChange} />
      )

      expect(getByTestId('tab-activity-active-indicator')).toBeTruthy()
      expect(() => getByTestId('tab-all-active-indicator')).toThrow()
    })

    it('should highlight "系统" tab when activeTab is SYSTEM', () => {
      const { getByTestId } = render(
        <MessageTabBar activeTab="SYSTEM" onTabChange={mockOnTabChange} />
      )

      expect(getByTestId('tab-system-active-indicator')).toBeTruthy()
      expect(() => getByTestId('tab-all-active-indicator')).toThrow()
    })

    it('should highlight "账单" tab when activeTab is BILLING', () => {
      const { getByTestId } = render(
        <MessageTabBar activeTab="BILLING" onTabChange={mockOnTabChange} />
      )

      expect(getByTestId('tab-billing-active-indicator')).toBeTruthy()
      expect(() => getByTestId('tab-all-active-indicator')).toThrow()
    })
  })

  describe('Tab Press Interaction', () => {
    it('should call onTabChange with undefined when "全部" tab is pressed', () => {
      const { getByTestId } = render(
        <MessageTabBar activeTab="ACTIVITY" onTabChange={mockOnTabChange} />
      )

      fireEvent.press(getByTestId('tab-all'))
      expect(mockOnTabChange).toHaveBeenCalledWith(undefined)
    })

    it('should call onTabChange with ACTIVITY when "互动" tab is pressed', () => {
      const { getByTestId } = render(
        <MessageTabBar activeTab={undefined} onTabChange={mockOnTabChange} />
      )

      fireEvent.press(getByTestId('tab-activity'))
      expect(mockOnTabChange).toHaveBeenCalledWith('ACTIVITY')
    })

    it('should call onTabChange with SYSTEM when "系统" tab is pressed', () => {
      const { getByTestId } = render(
        <MessageTabBar activeTab={undefined} onTabChange={mockOnTabChange} />
      )

      fireEvent.press(getByTestId('tab-system'))
      expect(mockOnTabChange).toHaveBeenCalledWith('SYSTEM')
    })

    it('should call onTabChange with BILLING when "账单" tab is pressed', () => {
      const { getByTestId } = render(
        <MessageTabBar activeTab={undefined} onTabChange={mockOnTabChange} />
      )

      fireEvent.press(getByTestId('tab-billing'))
      expect(mockOnTabChange).toHaveBeenCalledWith('BILLING')
    })

    it('should call onTabChange even when pressing the already active tab', () => {
      const { getByTestId } = render(
        <MessageTabBar activeTab={undefined} onTabChange={mockOnTabChange} />
      )

      fireEvent.press(getByTestId('tab-all'))
      expect(mockOnTabChange).toHaveBeenCalledWith(undefined)
    })
  })

  describe('Unread Badge Display', () => {
    it('should show unread badge on "全部" tab when all count > 0', () => {
      const { getByTestId, getByText } = render(
        <MessageTabBar
          activeTab={undefined}
          onTabChange={mockOnTabChange}
          unreadCounts={{ all: 5 }}
        />
      )

      expect(getByTestId('tab-all-badge')).toBeTruthy()
      expect(getByText('5')).toBeTruthy()
    })

    it('should show unread badge on "互动" tab when activity count > 0', () => {
      const { getByTestId, getByText } = render(
        <MessageTabBar
          activeTab={undefined}
          onTabChange={mockOnTabChange}
          unreadCounts={{ activity: 3 }}
        />
      )

      expect(getByTestId('tab-activity-badge')).toBeTruthy()
      expect(getByText('3')).toBeTruthy()
    })

    it('should show unread badge on "系统" tab when system count > 0', () => {
      const { getByTestId, getByText } = render(
        <MessageTabBar
          activeTab={undefined}
          onTabChange={mockOnTabChange}
          unreadCounts={{ system: 10 }}
        />
      )

      expect(getByTestId('tab-system-badge')).toBeTruthy()
      expect(getByText('10')).toBeTruthy()
    })

    it('should show unread badge on "账单" tab when billing count > 0', () => {
      const { getByTestId, getByText } = render(
        <MessageTabBar
          activeTab={undefined}
          onTabChange={mockOnTabChange}
          unreadCounts={{ billing: 2 }}
        />
      )

      expect(getByTestId('tab-billing-badge')).toBeTruthy()
      expect(getByText('2')).toBeTruthy()
    })

    it('should show multiple badges when multiple counts > 0', () => {
      const { getByTestId } = render(
        <MessageTabBar
          activeTab={undefined}
          onTabChange={mockOnTabChange}
          unreadCounts={{ all: 15, activity: 5, system: 8, billing: 2 }}
        />
      )

      expect(getByTestId('tab-all-badge')).toBeTruthy()
      expect(getByTestId('tab-activity-badge')).toBeTruthy()
      expect(getByTestId('tab-system-badge')).toBeTruthy()
      expect(getByTestId('tab-billing-badge')).toBeTruthy()
    })

    it('should show "99+" when count exceeds 99', () => {
      const { getByText } = render(
        <MessageTabBar
          activeTab={undefined}
          onTabChange={mockOnTabChange}
          unreadCounts={{ all: 150 }}
        />
      )

      expect(getByText('99+')).toBeTruthy()
    })
  })

  describe('No Badge Display', () => {
    it('should not show badge when unreadCounts is not provided', () => {
      const { queryByTestId } = render(
        <MessageTabBar activeTab={undefined} onTabChange={mockOnTabChange} />
      )

      expect(queryByTestId('tab-all-badge')).toBeNull()
      expect(queryByTestId('tab-activity-badge')).toBeNull()
      expect(queryByTestId('tab-system-badge')).toBeNull()
      expect(queryByTestId('tab-billing-badge')).toBeNull()
    })

    it('should not show badge when count is 0', () => {
      const { queryByTestId } = render(
        <MessageTabBar
          activeTab={undefined}
          onTabChange={mockOnTabChange}
          unreadCounts={{ all: 0, activity: 0, system: 0, billing: 0 }}
        />
      )

      expect(queryByTestId('tab-all-badge')).toBeNull()
      expect(queryByTestId('tab-activity-badge')).toBeNull()
      expect(queryByTestId('tab-system-badge')).toBeNull()
      expect(queryByTestId('tab-billing-badge')).toBeNull()
    })

    it('should not show badge when count is undefined', () => {
      const { queryByTestId } = render(
        <MessageTabBar
          activeTab={undefined}
          onTabChange={mockOnTabChange}
          unreadCounts={{}}
        />
      )

      expect(queryByTestId('tab-all-badge')).toBeNull()
      expect(queryByTestId('tab-activity-badge')).toBeNull()
      expect(queryByTestId('tab-system-badge')).toBeNull()
      expect(queryByTestId('tab-billing-badge')).toBeNull()
    })
  })
})

describe('MessageTabBar Types', () => {
  it('should accept valid MessageType values', () => {
    const types: MessageType[] = [undefined, 'ACTIVITY', 'SYSTEM', 'BILLING']
    types.forEach((type) => {
      expect([undefined, 'ACTIVITY', 'SYSTEM', 'BILLING']).toContain(type)
    })
  })
})