// ============================================================
// Usage 页面测试
// ============================================================

import { describe, it, expect, beforeEach, afterEach } from 'vitest'
import { render, screen, waitFor } from '@testing-library/react'
import { http, HttpResponse } from 'msw'
import { setupServer } from 'msw/node'
import { QueryClient, QueryClientProvider } from '@tanstack/react-query'

import Usage from '@/pages/Usage'

// ── Mock data ────────────────────────────────────────────────

const mockDailyStats = [
  {
    day: '2026-03-28',
    request_count: 120,
    input_tokens: 24000,
    output_tokens: 8000,
    unique_devices: 5,
  },
  {
    day: '2026-03-29',
    request_count: 80,
    input_tokens: 16000,
    output_tokens: 5000,
    unique_devices: 3,
  },
  {
    day: '2026-03-30',
    request_count: 200,
    input_tokens: 40000,
    output_tokens: 12000,
    unique_devices: 7,
  },
]

const mockModelStats = [
  {
    model_id: 'gpt-4o',
    request_count: 300,
    input_tokens: 60000,
    output_tokens: 18000,
    avg_latency_ms: 450.3,
    success_rate: 0.98,
  },
  {
    model_id: 'claude-sonnet-4-20250514',
    request_count: 100,
    input_tokens: 20000,
    output_tokens: 7000,
    avg_latency_ms: 620.7,
    success_rate: 0.95,
  },
]

// ── MSW server ───────────────────────────────────────────────

const server = setupServer()

beforeEach(() => {
  server.listen({ onUnhandledRequest: 'bypass' })
})

afterEach(() => {
  server.close()
})

// ── Helper: render with QueryClient ──────────────────────────

function renderWithProviders(ui: React.ReactElement) {
  const queryClient = new QueryClient({
    defaultOptions: {
      queries: { retry: false },
    },
  })
  return render(
    <QueryClientProvider client={queryClient}>
      {ui}
    </QueryClientProvider>,
  )
}

// ── Tests ────────────────────────────────────────────────────

describe('Usage page', () => {
  it('renders page title and summary cards', async () => {
    server.use(
      http.get('*/api/v1/telemetry/daily', () => {
        return HttpResponse.json(mockDailyStats)
      }),
      http.get('*/api/v1/telemetry/stats', () => {
        return HttpResponse.json(mockModelStats)
      }),
    )

    renderWithProviders(<Usage />)

    expect(screen.getByText('用量统计')).toBeInTheDocument()
    expect(screen.getByText('查看模型使用情况和 Token 消耗')).toBeInTheDocument()

    // Summary card titles
    expect(screen.getByText('总请求数')).toBeInTheDocument()
    expect(screen.getByText('总 Token 数')).toBeInTheDocument()

    // Total requests: 120 + 80 + 200 = 400
    await waitFor(() => {
      expect(screen.getByText('400')).toBeInTheDocument()
    })

    // Total tokens: (24000+8000) + (16000+5000) + (40000+12000) = 105,000
    expect(screen.getByText('105,000')).toBeInTheDocument()
  })

  it('fetches and displays daily stats table', async () => {
    server.use(
      http.get('*/api/v1/telemetry/daily', () => {
        return HttpResponse.json(mockDailyStats)
      }),
      http.get('*/api/v1/telemetry/stats', () => {
        return HttpResponse.json(mockModelStats)
      }),
    )

    renderWithProviders(<Usage />)

    // Table column headers
    expect(screen.getByText('每日统计')).toBeInTheDocument()

    // Wait for data rows to render
    await waitFor(() => {
      expect(screen.getByText('2026-03-28')).toBeInTheDocument()
    })

    // Formatted request counts
    expect(screen.getByText('120')).toBeInTheDocument()
    expect(screen.getByText('80')).toBeInTheDocument()
    expect(screen.getByText('200')).toBeInTheDocument()

    // Device counts
    expect(screen.getByText('5')).toBeInTheDocument()
  })

  it('fetches and displays model stats table', async () => {
    server.use(
      http.get('*/api/v1/telemetry/daily', () => {
        return HttpResponse.json(mockDailyStats)
      }),
      http.get('*/api/v1/telemetry/stats', () => {
        return HttpResponse.json(mockModelStats)
      }),
    )

    renderWithProviders(<Usage />)

    expect(screen.getByText('按模型统计')).toBeInTheDocument()

    await waitFor(() => {
      expect(screen.getByText('gpt-4o')).toBeInTheDocument()
    })

    expect(screen.getByText('claude-sonnet-4-20250514')).toBeInTheDocument()

    // Success rate: 0.98 -> "98.0%"
    expect(screen.getByText('98.0%')).toBeInTheDocument()

    // Avg latency: 450.3 -> "450ms"
    expect(screen.getByText('450ms')).toBeInTheDocument()
  })

  it('shows loading spinner before data loads', async () => {
    server.use(
      http.get('*/api/v1/telemetry/daily', async () => {
        await new Promise((resolve) => setTimeout(resolve, 500))
        return HttpResponse.json(mockDailyStats)
      }),
      http.get('*/api/v1/telemetry/stats', async () => {
        await new Promise((resolve) => setTimeout(resolve, 500))
        return HttpResponse.json(mockModelStats)
      }),
    )

    renderWithProviders(<Usage />)

    // Ant Design Spin component renders a .ant-spin element
    const spinner = document.querySelector('.ant-spin')
    expect(spinner).toBeTruthy()

    // Wait for loading to complete so afterEach cleanup is clean
    await waitFor(() => {
      expect(screen.getByText('用量统计')).toBeInTheDocument()
    })
  })

  it('shows ErrorState when daily stats request fails', async () => {
    server.use(
      http.get('*/api/v1/telemetry/daily', () => {
        return HttpResponse.json(
          { error: 'internal_error', message: '服务器内部错误' },
          { status: 500 },
        )
      }),
      http.get('*/api/v1/telemetry/stats', () => {
        return HttpResponse.json(mockModelStats)
      }),
    )

    renderWithProviders(<Usage />)

    await waitFor(() => {
      expect(screen.getByText('服务器内部错误')).toBeInTheDocument()
    })

    // ErrorState renders a retry button (antd v6 may split Chinese characters)
    expect(screen.getByRole('button', { name: /重.*试/ })).toBeInTheDocument()
  })

  it('calculates totals correctly from daily data', async () => {
    server.use(
      http.get('*/api/v1/telemetry/daily', () => {
        return HttpResponse.json([
          {
            day: '2026-03-30',
            request_count: 1500,
            input_tokens: 10000,
            output_tokens: 3000,
            unique_devices: 2,
          },
        ])
      }),
      http.get('*/api/v1/telemetry/stats', () => {
        return HttpResponse.json([])
      }),
    )

    renderWithProviders(<Usage />)

    // Total requests: 1500 (formatted as "1,500" by Statistic)
    await waitFor(() => {
      const elements = screen.getAllByText('1,500')
      expect(elements.length).toBeGreaterThanOrEqual(1)
    })

    // Total tokens: 10000 + 3000 = 13,000
    expect(screen.getAllByText('13,000').length).toBeGreaterThanOrEqual(1)
  })
})