import { render, screen, fireEvent } from '@testing-library/react'
import { describe, test, expect, vi } from 'vitest'
import React from 'react'

describe('User Flow Tests', () => {
  test('create project flow mock', () => {
    const MockCreateProject = () => {
      const [project, setProject] = React.useState('')
      return (
        <div>
          <h1>Create Project</h1>
          <input 
            placeholder="Project title"
            value={project}
            onChange={(e) => setProject(e.target.value)}
          />
          <button>Create</button>
        </div>
      )
    }
    
    render(<MockCreateProject />)
    expect(screen.getByText('Create Project')).toBeInTheDocument()
    expect(screen.getByPlaceholderText('Project title')).toBeInTheDocument()
    expect(screen.getByRole('button', { name: 'Create' })).toBeInTheDocument()
  })

  test('search functionality mock', () => {
    const MockSearch = () => {
      const [query, setQuery] = React.useState('')
      return (
        <div>
          <h1>Search</h1>
          <input 
            placeholder="Search knowledge base"
            value={query}
            onChange={(e) => setQuery(e.target.value)}
          />
          {query && <div>Results for: {query}</div>}
        </div>
      )
    }
    
    render(<MockSearch />)
    const input = screen.getByPlaceholderText('Search knowledge base')
    fireEvent.change(input, { target: { value: 'test query' } })
    expect(screen.getByText('Results for: test query')).toBeInTheDocument()
  })

  test('settings toggle mock', () => {
    const MockSettings = () => {
      const [theme, setTheme] = React.useState('light')
      return (
        <div>
          <h1>Settings</h1>
          <button onClick={() => setTheme(theme === 'light' ? 'dark' : 'light')}>
            Theme: {theme}
          </button>
        </div>
      )
    }
    
    render(<MockSettings />)
    const button = screen.getByText('Theme: light')
    fireEvent.click(button)
    expect(screen.getByText('Theme: dark')).toBeInTheDocument()
  })

  test('file upload mock', () => {
    const MockUpload = () => {
      const [uploaded, setUploaded] = React.useState(false)
      return (
        <div>
          <h1>Upload Documents</h1>
          <input type="file" onChange={() => setUploaded(true)} data-testid="file-input" />
          {uploaded && <div>File uploaded successfully</div>}
        </div>
      )
    }
    
    render(<MockUpload />)
    const input = screen.getByTestId('file-input')
    fireEvent.change(input)
    expect(screen.getByText('File uploaded successfully')).toBeInTheDocument()
  })

  test('connection status mock', () => {
    const MockConnection = () => {
      const [connected, setConnected] = React.useState(true)
      return (
        <div>
          <h1>Connection Status</h1>
          <div>{connected ? 'Connected' : 'Disconnected'}</div>
          <button onClick={() => setConnected(!connected)}>
            Toggle Connection
          </button>
        </div>
      )
    }
    
    render(<MockConnection />)
    expect(screen.getByText('Connected')).toBeInTheDocument()
    
    fireEvent.click(screen.getByText('Toggle Connection'))
    expect(screen.getByText('Disconnected')).toBeInTheDocument()
  })

  test('task management mock', () => {
    const MockTasks = () => {
      const [tasks, setTasks] = React.useState(['Task 1', 'Task 2'])
      const addTask = () => setTasks([...tasks, `Task ${tasks.length + 1}`])
      
      return (
        <div>
          <h1>Task Management</h1>
          <button onClick={addTask}>Add Task</button>
          <ul>
            {tasks.map((task, index) => (
              <li key={index}>{task}</li>
            ))}
          </ul>
        </div>
      )
    }
    
    render(<MockTasks />)
    expect(screen.getByText('Task 1')).toBeInTheDocument()
    
    fireEvent.click(screen.getByText('Add Task'))
    expect(screen.getByText('Task 3')).toBeInTheDocument()
  })

  test('navigation mock', () => {
    const MockNav = () => {
      const [currentPage, setCurrentPage] = React.useState('home')
      return (
        <div>
          <nav>
            <button onClick={() => setCurrentPage('projects')}>Projects</button>
            <button onClick={() => setCurrentPage('settings')}>Settings</button>
          </nav>
          <main>
            <h1>Current page: {currentPage}</h1>
          </main>
        </div>
      )
    }
    
    render(<MockNav />)
    expect(screen.getByText('Current page: home')).toBeInTheDocument()
    
    fireEvent.click(screen.getByText('Projects'))
    expect(screen.getByText('Current page: projects')).toBeInTheDocument()
  })

  test('form validation mock', () => {
    const MockForm = () => {
      const [email, setEmail] = React.useState('')
      const [error, setError] = React.useState('')
      
      const handleSubmit = () => {
        if (!email.includes('@')) {
          setError('Invalid email')
        } else {
          setError('')
        }
      }
      
      return (
        <div>
          <h1>Form Validation</h1>
          <input 
            placeholder="Email"
            value={email}
            onChange={(e) => setEmail(e.target.value)}
          />
          <button onClick={handleSubmit}>Submit</button>
          {error && <div role="alert">{error}</div>}
        </div>
      )
    }
    
    render(<MockForm />)
    const input = screen.getByPlaceholderText('Email')
    
    fireEvent.change(input, { target: { value: 'invalid' } })
    fireEvent.click(screen.getByText('Submit'))
    expect(screen.getByRole('alert')).toHaveTextContent('Invalid email')
  })

  test('theme switching mock', () => {
    const MockTheme = () => {
      const [isDark, setIsDark] = React.useState(false)
      return (
        <div className={isDark ? 'dark' : 'light'}>
          <h1>Theme Test</h1>
          <button onClick={() => setIsDark(!isDark)}>
            Switch to {isDark ? 'Light' : 'Dark'}
          </button>
        </div>
      )
    }
    
    render(<MockTheme />)
    const button = screen.getByText('Switch to Dark')
    fireEvent.click(button)
    expect(screen.getByText('Switch to Light')).toBeInTheDocument()
  })

  test('data filtering mock', () => {
    const MockFilter = () => {
      const [filter, setFilter] = React.useState('')
      const items = ['Apple', 'Banana', 'Cherry']
      const filtered = items.filter(item => 
        item.toLowerCase().includes(filter.toLowerCase())
      )
      
      return (
        <div>
          <h1>Filter Test</h1>
          <input 
            placeholder="Filter items"
            value={filter}
            onChange={(e) => setFilter(e.target.value)}
          />
          <ul>
            {filtered.map((item, index) => (
              <li key={index}>{item}</li>
            ))}
          </ul>
        </div>
      )
    }
    
    render(<MockFilter />)
    const input = screen.getByPlaceholderText('Filter items')
    
    fireEvent.change(input, { target: { value: 'a' } })
    expect(screen.getByText('Apple')).toBeInTheDocument()
    expect(screen.getByText('Banana')).toBeInTheDocument()
    expect(screen.queryByText('Cherry')).not.toBeInTheDocument()
  })
})