import { describe, it, expect, vi, beforeEach } from 'vitest'
import { render, screen, fireEvent } from '@testing-library/react'
import { ProgressTracker } from '../ui/ProgressTracker'

describe('ProgressTracker', () => {
  const mockOnShowTaskList = vi.fn()

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

  describe('基礎渲染', () => {
    it('應該正確顯示進度文字', () => {
      render(
        <ProgressTracker
          completedTests={3}
          totalTests={10}
          onShowTaskList={mockOnShowTaskList}
        />
      )

      expect(screen.getByText('學習進度')).toBeInTheDocument()
      expect(screen.getByText('測驗: 3/10')).toBeInTheDocument()
    })

    it('應該在沒有測驗時顯示 0/0', () => {
      render(
        <ProgressTracker
          completedTests={0}
          totalTests={0}
          onShowTaskList={mockOnShowTaskList}
        />
      )

      expect(screen.getByText('測驗: 0/0')).toBeInTheDocument()
    })
  })

  describe('進度百分比計算', () => {
    it('應該正確計算進度百分比', () => {
      render(
        <ProgressTracker
          completedTests={5}
          totalTests={10}
          onShowTaskList={mockOnShowTaskList}
        />
      )

      // 檢查進度條寬度 (50%) - 使用實際的 div 元素
      const progressBar = document.querySelector('.bg-blue-500')
      expect(progressBar).toHaveStyle({ width: '50%' })
    })

    it('應該處理 100% 完成的情況', () => {
      render(
        <ProgressTracker
          completedTests={10}
          totalTests={10}
          onShowTaskList={mockOnShowTaskList}
        />
      )

      const progressBar = document.querySelector('.bg-blue-500')
      expect(progressBar).toHaveStyle({ width: '100%' })
    })

    it('應該處理 0% 完成的情況', () => {
      render(
        <ProgressTracker
          completedTests={0}
          totalTests={5}
          onShowTaskList={mockOnShowTaskList}
        />
      )

      const progressBar = document.querySelector('.bg-blue-500')
      expect(progressBar).toHaveStyle({ width: '0%' })
    })

    it('應該處理除零情況 (totalTests = 0)', () => {
      render(
        <ProgressTracker
          completedTests={0}
          totalTests={0}
          onShowTaskList={mockOnShowTaskList}
        />
      )

      const progressBar = document.querySelector('.bg-blue-500')
      expect(progressBar).toHaveStyle({ width: '0%' })
    })
  })

  describe('交互功能', () => {
    it('應該在點擊按鈕時調用 onShowTaskList', () => {
      render(
        <ProgressTracker
          completedTests={3}
          totalTests={10}
          onShowTaskList={mockOnShowTaskList}
        />
      )

      const button = screen.getByText('測驗: 3/10')
      fireEvent.click(button)

      expect(mockOnShowTaskList).toHaveBeenCalledTimes(1)
    })

    it('應該在點擊進度條時也調用 onShowTaskList', () => {
      render(
        <ProgressTracker
          completedTests={5}
          totalTests={10}
          onShowTaskList={mockOnShowTaskList}
        />
      )

      const progressBarContainer = document.querySelector('.cursor-pointer.hover\\:bg-gray-300')
      fireEvent.click(progressBarContainer!)

      expect(mockOnShowTaskList).toHaveBeenCalledTimes(1)
    })
  })

  describe('邊界值測試', () => {
    it('應該處理負數輸入', () => {
      render(
        <ProgressTracker
          completedTests={-1}
          totalTests={5}
          onShowTaskList={mockOnShowTaskList}
        />
      )

      expect(screen.getByText('測驗: -1/5')).toBeInTheDocument()
    })

    it('應該處理 completedTests > totalTests 的情況', () => {
      render(
        <ProgressTracker
          completedTests={15}
          totalTests={10}
          onShowTaskList={mockOnShowTaskList}
        />
      )

      expect(screen.getByText('測驗: 15/10')).toBeInTheDocument()
      const progressBar = document.querySelector('.bg-blue-500')
      expect(progressBar).toHaveStyle({ width: '150%' })
    })
  })

  describe('可訪問性', () => {
    it('應該有正確的 aria 屬性', () => {
      render(
        <ProgressTracker
          completedTests={3}
          totalTests={10}
          onShowTaskList={mockOnShowTaskList}
        />
      )

      const button = screen.getByRole('button')
      expect(button).toHaveAttribute('title', '點擊查看詳細進度')
    })

    it('應該有正確的進度條元素', () => {
      render(
        <ProgressTracker
          completedTests={5}
          totalTests={10}
          onShowTaskList={mockOnShowTaskList}
        />
      )

      const progressBar = document.querySelector('.bg-blue-500')
      expect(progressBar).toBeInTheDocument()
    })
  })
})