/**
 * R38修复：磁盘空间检查测试
 *
 * 测试内容：
 * - formatBytes 函数
 * - getDiskUsageLevel 函数（逻辑验证）
 * - hasEnoughDiskSpace 函数（逻辑验证）
 * - ensureEnoughDiskSpace 函数（逻辑验证）
 */

import { exec } from 'child_process'
import { promisify } from 'util'
import { formatBytes } from '../disk-space'

const execAsync = promisify(exec)

// Mock child_process.exec at module level
jest.mock('child_process', () => {
  const originalModule = jest.requireActual('child_process')
  return {
    ...originalModule,
    exec: jest.fn(),
  }
})

describe('R38: disk-space', () => {
  beforeEach(() => {
    jest.clearAllMocks()
  })

  describe('formatBytes', () => {
    it('应该正确格式化字节数', () => {
      expect(formatBytes(0)).toBe('0.00 B')
      expect(formatBytes(1024)).toBe('1.00 KB')
      expect(formatBytes(1024 * 1024)).toBe('1.00 MB')
      expect(formatBytes(1024 * 1024 * 1024)).toBe('1.00 GB')
      expect(formatBytes(1024 * 1024 * 1024 * 1024)).toBe('1.00 TB')
      expect(formatBytes(1536)).toBe('1.50 KB')
    })
  })

  describe('getDiskUsageLevel - 逻辑验证', () => {
    it('使用率低于 70% 应该返回 ok', async () => {
      const mockExec = exec as jest.MockedFunction<typeof exec>
      mockExec.mockImplementationOnce((command, options, callback) => {
        if (typeof options === 'function') {
          callback = options
        }
        // 模拟 PowerShell JSON 输出（60% 使用率）
        const stdout = JSON.stringify({ Used: 60000000000, Free: 40000000000 })
        ;(callback as Function)(null, { stdout, stderr: '' })
        return {} as any
      })

      const { getDiskUsageLevel } = require('../disk-space')
      const result = await getDiskUsageLevel()
      expect(result).toBe('ok')
    })

    it('使用率在 70%-90% 之间应该返回 warning', async () => {
      const mockExec = exec as jest.MockedFunction<typeof exec>
      mockExec.mockImplementationOnce((command, options, callback) => {
        if (typeof options === 'function') {
          callback = options
        }
        // 模拟 PowerShell JSON 输出（75% 使用率）
        const stdout = JSON.stringify({ Used: 75000000000, Free: 25000000000 })
        ;(callback as Function)(null, { stdout, stderr: '' })
        return {} as any
      })

      const { getDiskUsageLevel } = require('../disk-space')
      const result = await getDiskUsageLevel()
      expect(result).toBe('warning')
    })

    it('使用率大于 90% 应该返回 critical', async () => {
      const mockExec = exec as jest.MockedFunction<typeof exec>
      mockExec.mockImplementationOnce((command, options, callback) => {
        if (typeof options === 'function') {
          callback = options
        }
        // 模拟 PowerShell JSON 输出（95% 使用率）
        const stdout = JSON.stringify({ Used: 95000000000, Free: 5000000000 })
        ;(callback as Function)(null, { stdout, stderr: '' })
        return {} as any
      })

      const { getDiskUsageLevel } = require('../disk-space')
      const result = await getDiskUsageLevel()
      expect(result).toBe('critical')
    })

    it('无法检查时应该返回 ok', async () => {
      const mockExec = exec as jest.MockedFunction<typeof exec>
      mockExec.mockImplementationOnce((command, options, callback) => {
        if (typeof options === 'function') {
          callback = options
        }
        // 模拟命令失败
        ;(callback as Function)(new Error('Command failed'), null)
        return {} as any
      })

      const { getDiskUsageLevel } = require('../disk-space')
      const result = await getDiskUsageLevel()
      expect(result).toBe('ok')
    })
  })

  describe('hasEnoughDiskSpace - 逻辑验证', () => {
    it('当空间足够时应该返回 true', async () => {
      const mockExec = exec as jest.MockedFunction<typeof exec>
      mockExec.mockImplementationOnce((command, options, callback) => {
        if (typeof options === 'function') {
          callback = options
        }
        // 模拟 PowerShell JSON 输出（20% 使用率，80GB 可用）
        const stdout = JSON.stringify({ Used: 20000000000, Free: 80000000000 })
        ;(callback as Function)(null, { stdout, stderr: '' })
        return {} as any
      })

      const { hasEnoughDiskSpace } = require('../disk-space')
      const result = await hasEnoughDiskSpace(10 * 1024 * 1024 * 1024)
      expect(result).toBe(true)
    })

    it('当可用空间不足时应该返回 false', async () => {
      const mockExec = exec as jest.MockedFunction<typeof exec>
      mockExec.mockImplementationOnce((command, options, callback) => {
        if (typeof options === 'function') {
          callback = options
        }
        // 模拟 PowerShell JSON 输出（90% 使用率，10GB 可用）
        const stdout = JSON.stringify({ Used: 90000000000, Free: 10000000000 })
        ;(callback as Function)(null, { stdout, stderr: '' })
        return {} as any
      })

      const { hasEnoughDiskSpace } = require('../disk-space')
      const result = await hasEnoughDiskSpace(20 * 1024 * 1024 * 1024)
      expect(result).toBe(false)
    })

    it('当磁盘使用率过高时应该返回 false', async () => {
      const mockExec = exec as jest.MockedFunction<typeof exec>
      mockExec.mockImplementationOnce((command, options, callback) => {
        if (typeof options === 'function') {
          callback = options
        }
        // 模拟 PowerShell JSON 输出（95% 使用率，5GB 可用）
        const stdout = JSON.stringify({ Used: 95000000000, Free: 5000000000 })
        ;(callback as Function)(null, { stdout, stderr: '' })
        return {} as any
      })

      const { hasEnoughDiskSpace } = require('../disk-space')
      const result = await hasEnoughDiskSpace(100 * 1024 * 1024)
      expect(result).toBe(false)
    })

    it('当无法检查时应该返回 true（保守处理）', async () => {
      const mockExec = exec as jest.MockedFunction<typeof exec>
      mockExec.mockImplementationOnce((command, options, callback) => {
        if (typeof options === 'function') {
          callback = options
        }
        // 模拟命令失败
        ;(callback as Function)(new Error('Command failed'), null)
        return {} as any
      })

      const { hasEnoughDiskSpace } = require('../disk-space')
      const result = await hasEnoughDiskSpace(10 * 1024 * 1024 * 1024)
      expect(result).toBe(true)
    })
  })

  describe('ensureEnoughDiskSpace - 逻辑验证', () => {
    it('当空间足够时不应该抛出错误', async () => {
      const mockExec = exec as jest.MockedFunction<typeof exec>
      mockExec.mockImplementationOnce((command, options, callback) => {
        if (typeof options === 'function') {
          callback = options
        }
        // 模拟 PowerShell JSON 输出（20% 使用率，80GB 可用）
        const stdout = JSON.stringify({ Used: 20000000000, Free: 80000000000 })
        ;(callback as Function)(null, { stdout, stderr: '' })
        return {} as any
      })

      const { ensureEnoughDiskSpace } = require('../disk-space')
      await expect(ensureEnoughDiskSpace(10 * 1024 * 1024 * 1024, '测试操作')).resolves.not.toThrow()
    })

    it('当空间不足时应该抛出错误', async () => {
      const mockExec = exec as jest.MockedFunction<typeof exec>
      mockExec.mockImplementationOnce((command, options, callback) => {
        if (typeof options === 'function') {
          callback = options
        }
        // 模拟 PowerShell JSON 输出（90% 使用率，10GB 可用）
        const stdout = JSON.stringify({ Used: 90000000000, Free: 10000000000 })
        ;(callback as Function)(null, { stdout, stderr: '' })
        return {} as any
      })

      const { ensureEnoughDiskSpace } = require('../disk-space')
      await expect(ensureEnoughDiskSpace(20 * 1024 * 1024 * 1024, '测试操作')).rejects.toThrow('磁盘空间不足')
    })

    it('当无法检查时不应该抛出错误', async () => {
      const mockExec = exec as jest.MockedFunction<typeof exec>
      mockExec.mockImplementationOnce((command, options, callback) => {
        if (typeof options === 'function') {
          callback = options
        }
        // 模拟命令失败
        ;(callback as Function)(new Error('Command failed'), null)
        return {} as any
      })

      const { ensureEnoughDiskSpace } = require('../disk-space')
      await expect(ensureEnoughDiskSpace(10 * 1024 * 1024 * 1024, '测试操作')).resolves.not.toThrow()
    })
  })

  describe('数值计算验证', () => {
    it('应该正确计算使用率百分比', () => {
      const total = 100000000000
      const used = 70000000000
      const usePercent = (used / total) * 100

      expect(usePercent).toBe(70)
    })

    it('应该正确计算保留空间', () => {
      const total = 100000000000
      const usePercent = 90
      const minReserved = Math.max(total * 0.1, 5 * 1024 * 1024 * 1024)

      expect(minReserved).toBeGreaterThanOrEqual(5 * 1024 * 1024 * 1024) // 至少 5GB
    })

    it('应该正确格式化字节大小', () => {
      const bytes = 10 * 1024 * 1024 * 1024
      expect(formatBytes(bytes)).toBe('10.00 GB')
    })
  })
})