import { beforeEach, describe, expect, it, vi } from 'vitest'
import { useRuntimeConsole } from '@/composables/useRuntimeConsole'

describe('useRuntimeConsole', () => {
  let console_: ReturnType<typeof useRuntimeConsole>

  beforeEach(() => {
    console_ = useRuntimeConsole()
    console_.clear()
    console_.levelFilter.value = ''
    console_.categoryFilter.value = ''
    console_.searchText.value = ''
  })

  // ──── log() ────

  describe('log() 添加运行日志', () => {
    it('应添加一条日志到列表头部', () => {
      console_.log('INFO', '系统', '启动完成')

      expect(console_.entries.value).toHaveLength(1)
      expect(console_.entries.value[0]).toMatchObject({
        level: 'INFO',
        category: '系统',
        message: '启动完成',
      })
    })

    it('应支持 quality 和 source 可选参数', () => {
      console_.log('WARN', '信号', '信号质量下降', 'BAD', 'PLC-01')

      const entry = console_.entries.value[0]
      expect(entry.quality).toBe('BAD')
      expect(entry.source).toBe('PLC-01')
    })

    it('quality 和 source 未提供时应为 undefined', () => {
      console_.log('INFO', '系统', '正常运行')

      const entry = console_.entries.value[0]
      expect(entry.quality).toBeUndefined()
      expect(entry.source).toBeUndefined()
    })

    it('新日志应排在最前面', () => {
      console_.log('INFO', '系统', '第一条')
      console_.log('ERROR', '告警', '第二条')

      expect(console_.entries.value[0].message).toBe('第二条')
      expect(console_.entries.value[1].message).toBe('第一条')
    })

    it('超过 1000 条时应截断旧日志', () => {
      for (let i = 0; i < 1010; i++) {
        console_.log('INFO', '系统', `消息${i}`)
      }

      expect(console_.entries.value).toHaveLength(1000)
      expect(console_.entries.value[0].message).toBe('消息1009')
    })

    it('每条日志应有唯一 id 和时间戳', () => {
      console_.log('INFO', '系统', '消息A')
      console_.log('INFO', '系统', '消息B')

      const [a, b] = console_.entries.value
      expect(a.id).not.toBe(b.id)
      expect(a.timestamp).toBeTruthy()
      expect(b.timestamp).toBeTruthy()
    })
  })

  // ──── 便捷方法 info/warn/error ────

  describe('info() 便捷方法', () => {
    it('应以 INFO 级别记录', () => {
      console_.info('系统', '信息消息')

      expect(console_.entries.value[0].level).toBe('INFO')
      expect(console_.entries.value[0].message).toBe('信息消息')
    })

    it('应支持 quality 参数', () => {
      console_.info('信号', '信号正常', 'GOOD')

      expect(console_.entries.value[0].quality).toBe('GOOD')
    })
  })

  describe('warn() 便捷方法', () => {
    it('应以 WARN 级别记录', () => {
      console_.warn('系统', '警告消息')

      expect(console_.entries.value[0].level).toBe('WARN')
    })

    it('应支持 quality 参数', () => {
      console_.warn('信号', '信号不确定', 'UNCERTAIN')

      expect(console_.entries.value[0].quality).toBe('UNCERTAIN')
    })
  })

  describe('error() 便捷方法', () => {
    it('应以 ERROR 级别记录', () => {
      console_.error('系统', '错误消息')

      expect(console_.entries.value[0].level).toBe('ERROR')
    })

    it('应支持 source 参数', () => {
      console_.error('通信', '连接超时', 'PLC-02')

      expect(console_.entries.value[0].source).toBe('PLC-02')
    })

    it('quality 应为 undefined（error 不传 quality）', () => {
      console_.error('系统', '错误消息', 'source')

      expect(console_.entries.value[0].quality).toBeUndefined()
    })
  })

  // ──── clear() ────

  describe('clear() 清空日志', () => {
    it('应清空所有条目', () => {
      console_.info('系统', '消息1')
      console_.warn('告警', '消息2')
      console_.clear()

      expect(console_.entries.value).toHaveLength(0)
    })
  })

  // ──── filteredEntries ────

  describe('filteredEntries 过滤逻辑', () => {
    beforeEach(() => {
      console_.info('系统', '系统启动')
      console_.warn('信号', '信号波动')
      console_.error('通信', '连接中断', 'PLC-01')
      console_.info('信号', '信号恢复正常')
    })

    it('无过滤条件时应返回全部', () => {
      expect(console_.filteredEntries.value).toHaveLength(4)
    })

    it('按 levelFilter 过滤级别', () => {
      console_.levelFilter.value = 'INFO'

      expect(console_.filteredEntries.value).toHaveLength(2)
      expect(console_.filteredEntries.value.every(e => e.level === 'INFO')).toBe(true)
    })

    it('按 categoryFilter 过滤分类', () => {
      console_.categoryFilter.value = '信号'

      expect(console_.filteredEntries.value).toHaveLength(2)
      expect(console_.filteredEntries.value.every(e => e.category === '信号')).toBe(true)
    })

    it('按 searchText 模糊搜索 message', () => {
      console_.searchText.value = '连接'

      expect(console_.filteredEntries.value).toHaveLength(1)
      expect(console_.filteredEntries.value[0].message).toBe('连接中断')
    })

    it('按 searchText 模糊搜索 source', () => {
      console_.searchText.value = 'PLC'

      expect(console_.filteredEntries.value).toHaveLength(1)
      expect(console_.filteredEntries.value[0].source).toBe('PLC-01')
    })

    it('按 searchText 模糊搜索 category', () => {
      console_.searchText.value = '通信'

      expect(console_.filteredEntries.value).toHaveLength(1)
      expect(console_.filteredEntries.value[0].category).toBe('通信')
    })

    it('searchText 不区分大小写', () => {
      console_.log('INFO', 'System', 'Connection OK', undefined, 'Device-A')
      console_.searchText.value = 'connection'

      expect(console_.filteredEntries.value).toHaveLength(1)
      expect(console_.filteredEntries.value[0].message).toBe('Connection OK')
    })

    it('多个过滤条件组合使用', () => {
      console_.levelFilter.value = 'INFO'
      console_.categoryFilter.value = '信号'

      expect(console_.filteredEntries.value).toHaveLength(1)
      expect(console_.filteredEntries.value[0].message).toBe('信号恢复正常')
    })

    it('三个过滤条件同时使用', () => {
      console_.levelFilter.value = 'INFO'
      console_.categoryFilter.value = '信号'
      console_.searchText.value = '恢复'

      expect(console_.filteredEntries.value).toHaveLength(1)
      expect(console_.filteredEntries.value[0].message).toBe('信号恢复正常')
    })

    it('过滤条件无匹配时返回空数组', () => {
      console_.levelFilter.value = 'ERROR'
      console_.categoryFilter.value = '系统'

      expect(console_.filteredEntries.value).toHaveLength(0)
    })
  })

  // ──── categories ────

  describe('categories 计算属性', () => {
    it('空日志时返回空数组', () => {
      expect(console_.categories.value).toEqual([])
    })

    it('应返回去重排序后的分类列表', () => {
      console_.info('系统', '消息1')
      console_.info('信号', '消息2')
      console_.warn('系统', '消息3')
      console_.error('通信', '消息4')

      expect(console_.categories.value).toEqual(['信号', '系统', '通信'])
    })
  })

  // ──── levelCounts ────

  describe('levelCounts 计算属性', () => {
    it('空日志时所有计数为零', () => {
      expect(console_.levelCounts.value).toEqual({ INFO: 0, WARN: 0, ERROR: 0 })
    })

    it('应正确统计各级别数量', () => {
      console_.info('系统', '消息1')
      console_.info('系统', '消息2')
      console_.warn('告警', '消息3')
      console_.error('通信', '消息4')
      console_.error('通信', '消息5')
      console_.error('通信', '消息6')

      expect(console_.levelCounts.value).toEqual({
        INFO: 2,
        WARN: 1,
        ERROR: 3,
      })
    })
  })

  // ──── exportJSON() ────

  describe('exportJSON() 导出日志', () => {
    it('应创建 Blob 下载并清理', () => {
      console_.info('系统', '测试消息')

      const mockClick = vi.fn()
      const mockAppendChild = vi.spyOn(document.body, 'appendChild').mockImplementation(node => node)
      const mockRemoveChild = vi.spyOn(document.body, 'removeChild').mockImplementation(node => node)
      const mockCreateElement = vi.spyOn(document, 'createElement').mockReturnValue({
        get href() { return '' },
        set href(_: string) {},
        get download() { return '' },
        set download(_: string) {},
        click: mockClick,
      } as unknown as HTMLAnchorElement)
      const mockRevokeObjectURL = vi.spyOn(URL, 'revokeObjectURL').mockImplementation(() => {})
      const mockCreateObjectURL = vi.spyOn(URL, 'createObjectURL').mockReturnValue('blob:test')

      console_.exportJSON()

      expect(mockCreateObjectURL).toHaveBeenCalled()
      expect(mockClick).toHaveBeenCalled()
      expect(mockRevokeObjectURL).toHaveBeenCalledWith('blob:test')

      mockAppendChild.mockRestore()
      mockRemoveChild.mockRestore()
      mockCreateElement.mockRestore()
      mockRevokeObjectURL.mockRestore()
      mockCreateObjectURL.mockRestore()
    })
  })

  // ──── 单例共享 ────

  describe('单例模式', () => {
    it('多次调用 useRuntimeConsole() 应共享同一份状态', () => {
      const c1 = useRuntimeConsole()
      const c2 = useRuntimeConsole()

      c1.info('系统', '测试')

      expect(c2.entries.value).toHaveLength(c1.entries.value.length)
      expect(c2.entries.value[0].id).toBe(c1.entries.value[0].id)
    })
  })
})