import { describe, it, expect } from 'vitest'

/**
 * PR #669 測試: 防止 null token 導致未授權的 API 調用
 *
 * 問題：當用戶未登入時（user/token 為 null），SWR 仍然會使用空 key 發起 API 請求
 * 修復：在 SWR key 中添加 `user && token` 檢查，當未登入時返回 null，阻止 API 調用
 */

describe('API Guard Logic (PR #669)', () => {
  /**
   * 測試 SWR key 生成邏輯
   * 核心修復：key 必須包含 user && token 檢查
   */
  describe('SWR key generation', () => {
    it('should return null when user is null', () => {
      const user = null
      const token = 'valid-token'
      const traderId = '123'
      const currentPage = 'trader'

      const key =
        user && token && currentPage === 'trader' && traderId
          ? `status-${traderId}`
          : null

      expect(key).toBeNull()
    })

    it('should return null when token is null', () => {
      const user = { id: '1', email: 'test@example.com' }
      const token = null
      const traderId = '123'
      const currentPage = 'trader'

      const key =
        user && token && currentPage === 'trader' && traderId
          ? `status-${traderId}`
          : null

      expect(key).toBeNull()
    })

    it('should return null when both user and token are null', () => {
      const user = null
      const token = null
      const traderId = '123'
      const currentPage = 'trader'

      const key =
        user && token && currentPage === 'trader' && traderId
          ? `status-${traderId}`
          : null

      expect(key).toBeNull()
    })

    it('should return null when currentPage is not trader', () => {
      const user = { id: '1', email: 'test@example.com' }
      const token = 'valid-token'
      const traderId = '123'
      const currentPage: string = 'competition' // Not 'trader', so key should be null

      const key =
        user && token && currentPage === 'trader' && traderId
          ? `status-${traderId}`
          : null

      expect(key).toBeNull()
    })

    it('should return null when traderId is not set', () => {
      const user = { id: '1', email: 'test@example.com' }
      const token = 'valid-token'
      const traderId = null
      const currentPage = 'trader'

      const key =
        user && token && currentPage === 'trader' && traderId
          ? `status-${traderId}`
          : null

      expect(key).toBeNull()
    })

    it('should return valid key when all conditions are met', () => {
      const user = { id: '1', email: 'test@example.com' }
      const token = 'valid-token'
      const traderId = '123'
      const currentPage = 'trader'

      const key =
        user && token && currentPage === 'trader' && traderId
          ? `status-${traderId}`
          : null

      expect(key).toBe('status-123')
    })
  })

  /**
   * 測試不同 API 端點的條件邏輯
   * 所有需要認證的端點都應該檢查 user && token
   */
  describe('multiple API endpoints', () => {
    it('should guard status API', () => {
      const user = null
      const token = null
      const traderId = '123'
      const currentPage = 'trader'

      const statusKey =
        user && token && currentPage === 'trader' && traderId
          ? `status-${traderId}`
          : null

      expect(statusKey).toBeNull()
    })

    it('should guard account API', () => {
      const user = null
      const token = null
      const traderId = '123'
      const currentPage = 'trader'

      const accountKey =
        user && token && currentPage === 'trader' && traderId
          ? `account-${traderId}`
          : null

      expect(accountKey).toBeNull()
    })

    it('should guard positions API', () => {
      const user = null
      const token = null
      const traderId = '123'
      const currentPage = 'trader'

      const positionsKey =
        user && token && currentPage === 'trader' && traderId
          ? `positions-${traderId}`
          : null

      expect(positionsKey).toBeNull()
    })

    it('should guard decisions API', () => {
      const user = null
      const token = null
      const traderId = '123'
      const currentPage = 'trader'

      const decisionsKey =
        user && token && currentPage === 'trader' && traderId
          ? `decisions/latest-${traderId}`
          : null

      expect(decisionsKey).toBeNull()
    })

    it('should guard statistics API', () => {
      const user = null
      const token = null
      const traderId = '123'
      const currentPage = 'trader'

      const statsKey =
        user && token && currentPage === 'trader' && traderId
          ? `statistics-${traderId}`
          : null

      expect(statsKey).toBeNull()
    })

    it('should allow all API calls when authenticated', () => {
      const user = { id: '1', email: 'test@example.com' }
      const token = 'valid-token'
      const traderId = '123'
      const currentPage = 'trader'

      const statusKey =
        user && token && currentPage === 'trader' && traderId
          ? `status-${traderId}`
          : null
      const accountKey =
        user && token && currentPage === 'trader' && traderId
          ? `account-${traderId}`
          : null
      const positionsKey =
        user && token && currentPage === 'trader' && traderId
          ? `positions-${traderId}`
          : null

      expect(statusKey).toBe('status-123')
      expect(accountKey).toBe('account-123')
      expect(positionsKey).toBe('positions-123')
    })
  })

  /**
   * 測試 EquityChart 組件的條件邏輯
   * PR #669 同時修復了 EquityChart 中的相同問題
   */
  describe('EquityChart API guard', () => {
    it('should return null key when user is not authenticated', () => {
      const user = null
      const token = null
      const traderId = '123'

      const equityKey =
        user && token && traderId ? `equity-history-${traderId}` : null

      expect(equityKey).toBeNull()
    })

    it('should return null key when traderId is missing', () => {
      const user = { id: '1', email: 'test@example.com' }
      const token = 'valid-token'
      const traderId = null

      const equityKey =
        user && token && traderId ? `equity-history-${traderId}` : null

      expect(equityKey).toBeNull()
    })

    it('should return valid key when authenticated with traderId', () => {
      const user = { id: '1', email: 'test@example.com' }
      const token = 'valid-token'
      const traderId = '123'

      const equityKey =
        user && token && traderId ? `equity-history-${traderId}` : null
      const accountKey =
        user && token && traderId ? `account-${traderId}` : null

      expect(equityKey).toBe('equity-history-123')
      expect(accountKey).toBe('account-123')
    })
  })

  /**
   * 測試邊界情況和特殊值
   */
  describe('edge cases', () => {
    it('should treat empty string token as falsy', () => {
      const user = { id: '1', email: 'test@example.com' }
      const token = ''
      const traderId = '123'
      const currentPage = 'trader'

      const key =
        user && token && currentPage === 'trader' && traderId
          ? `status-${traderId}`
          : null

      expect(key).toBeNull()
    })

    it('should treat empty string traderId as falsy', () => {
      const user = { id: '1', email: 'test@example.com' }
      const token = 'valid-token'
      const traderId = ''
      const currentPage = 'trader'

      const key =
        user && token && currentPage === 'trader' && traderId
          ? `status-${traderId}`
          : null

      expect(key).toBeNull()
    })

    it('should handle undefined user', () => {
      const user = undefined
      const token = 'valid-token'
      const traderId = '123'
      const currentPage = 'trader'

      const key =
        user && token && currentPage === 'trader' && traderId
          ? `status-${traderId}`
          : null

      expect(key).toBeNull()
    })

    it('should handle undefined token', () => {
      const user = { id: '1', email: 'test@example.com' }
      const token = undefined
      const traderId = '123'
      const currentPage = 'trader'

      const key =
        user && token && currentPage === 'trader' && traderId
          ? `status-${traderId}`
          : null

      expect(key).toBeNull()
    })

    it('should handle numeric traderId', () => {
      const user = { id: '1', email: 'test@example.com' }
      const token = 'valid-token'
      const traderId = 123 // 數字而非字串
      const currentPage = 'trader'

      const key =
        user && token && currentPage === 'trader' && traderId
          ? `status-${traderId}`
          : null

      expect(key).toBe('status-123')
    })

    it('should handle zero traderId as falsy', () => {
      const user = { id: '1', email: 'test@example.com' }
      const token = 'valid-token'
      const traderId = 0
      const currentPage = 'trader'

      const key =
        user && token && currentPage === 'trader' && traderId
          ? `status-${traderId}`
          : null

      expect(key).toBeNull() // 0 is falsy
    })
  })

  /**
   * 測試防止 API 調用的邏輯流程
   */
  describe('API call prevention flow', () => {
    it('should prevent API call when key is null', () => {
      const key = null
      const shouldCallAPI = key !== null

      expect(shouldCallAPI).toBe(false)
    })

    it('should allow API call when key is valid', () => {
      const key = 'status-123'
      const shouldCallAPI = key !== null

      expect(shouldCallAPI).toBe(true)
    })

    it('should simulate SWR behavior with null key', () => {
      // SWR 不會在 key 為 null 時發起請求
      const key = null
      const fetcher = (k: string) => `API response for ${k}`

      // 模擬 SWR 行為：key 為 null 時不調用 fetcher
      const data = key ? fetcher(key) : undefined

      expect(data).toBeUndefined()
    })

    it('should simulate SWR behavior with valid key', () => {
      const key = 'status-123'
      const fetcher = (k: string) => `API response for ${k}`

      const data = key ? fetcher(key) : undefined

      expect(data).toBe('API response for status-123')
    })
  })
})
