import { expect } from 'chai'
import * as path from 'path'
import * as bcrypt from 'bcryptjs'
import * as crypto from 'crypto'

describe('Security Tests', () => {
  describe('Path Sanitization', () => {
    it('should reject path traversal attempts with ../', () => {
      const testCases = [
        '../../../etc/passwd',
        '..\\..\\..\\windows\\system32',
        'file/../../../etc/passwd',
        '....//....//etc/passwd',
      ]

      testCases.forEach(testCase => {
        // path.basename removes directories but may still leave .. in some cases
        const basename = path.basename(testCase)
        // Our sanitization should reject these patterns
        const hasDotDot = basename.includes('..')
        // Note: path.basename on Windows paths may keep ..
        // This is why we need additional sanitization beyond basename
        expect(testCase).to.include('..') // Original path should contain ..
      })
    })

    it('should reject paths with null bytes', () => {
      const maliciousPath = 'file.txt\0.jpg'
      const sanitized = maliciousPath.replace(/\0/g, '')
      expect(sanitized).to.not.include('\0')
    })

    it('should reject empty filenames', () => {
      const emptyNames = ['', ' ', '\t', '\n']
      emptyNames.forEach(name => {
        const trimmed = name.trim()
        expect(trimmed.length).to.equal(0)
      })
    })

    it('should reject filenames that are too long', () => {
      const longFilename = 'a'.repeat(300)
      expect(longFilename.length).to.be.greaterThan(255)
    })

    it('should allow safe filenames', () => {
      const safeFilenames = ['document.txt', 'certificate.pem', 'config.json', 'data-file-123.csv']

      safeFilenames.forEach(filename => {
        expect(filename).to.match(/^[a-zA-Z0-9._-]+$/)
        expect(filename.length).to.be.lessThan(256)
      })
    })
  })

  describe('Input Validation', () => {
    it('should validate file size limits', () => {
      const maxSize = 16 * 1024 * 1024 // 16MB
      const testSizes = [
        { size: 1024, shouldPass: true },
        { size: maxSize, shouldPass: true },
        { size: maxSize + 1, shouldPass: false },
        { size: 100 * 1024 * 1024, shouldPass: false },
      ]

      testSizes.forEach(({ size, shouldPass }) => {
        if (shouldPass) {
          expect(size).to.be.lessThanOrEqual(maxSize)
        } else {
          expect(size).to.be.greaterThan(maxSize)
        }
      })
    })

    it('should validate base64 encoded data', () => {
      const validBase64 = Buffer.from('test data').toString('base64')
      const decoded = Buffer.from(validBase64, 'base64')
      expect(decoded.toString()).to.equal('test data')
    })

    it('should handle invalid base64 gracefully', () => {
      const invalidBase64 = 'not valid base64!!!'
      const decoded = Buffer.from(invalidBase64, 'base64')
      // Should not throw, but result won't match original
      expect(decoded).to.exist
    })
  })

  describe('Authentication Security', () => {
    it('should require both username and password', () => {
      const testCases = [
        { username: undefined, password: 'pass', shouldFail: true },
        { username: 'user', password: undefined, shouldFail: true },
        { username: '', password: 'pass', shouldFail: true },
        { username: 'user', password: '', shouldFail: true },
        { username: 'user', password: 'pass', shouldFail: false },
      ]

      testCases.forEach(({ username, password, shouldFail }) => {
        const isValid = !!(username && password && username.length > 0 && password.length > 0)
        if (shouldFail) {
          expect(isValid).to.be.false
        } else {
          expect(isValid).to.be.true
        }
      })
    })

    it('should use secure password hashing', () => {
      const password = 'testPassword123'
      const hash = bcrypt.hashSync(password, 10)

      // Hash should be different from password
      expect(hash).to.not.equal(password)

      // Should be bcrypt format
      expect(hash).to.match(/^\$2[aby]\$\d{2}\$/)

      // Should verify correctly
      expect(bcrypt.compareSync(password, hash)).to.be.true
      expect(bcrypt.compareSync('wrongPassword', hash)).to.be.false
    })

    it('should use constant-time comparison for strings', () => {
      const str1 = 'testuser'
      const str2 = 'testuser'
      const str3 = 'wronguser'

      // Pad strings to same length for constant-time comparison
      const buf1 = Buffer.from(str1.padEnd(256, '\0'))
      const buf2 = Buffer.from(str2.padEnd(256, '\0'))
      const buf3 = Buffer.from(str3.padEnd(256, '\0'))

      expect(() => crypto.timingSafeEqual(buf1, buf2)).to.not.throw()
      expect(crypto.timingSafeEqual(buf1, buf2)).to.be.true
      expect(crypto.timingSafeEqual(buf1, buf3)).to.be.false
    })
  })

  describe('CORS Configuration', () => {
    it('should validate origin strings', () => {
      const allowedOrigins = ['http://localhost:3000', 'https://example.com']
      const testOrigins = [
        { origin: 'http://localhost:3000', shouldAllow: true },
        { origin: 'https://example.com', shouldAllow: true },
        { origin: 'http://evil.com', shouldAllow: false },
        { origin: 'https://malicious.site', shouldAllow: false },
      ]

      testOrigins.forEach(({ origin, shouldAllow }) => {
        const isAllowed = allowedOrigins.includes(origin)
        expect(isAllowed).to.equal(shouldAllow)
      })
    })

    it('should handle wildcard origin appropriately', () => {
      const allowedOrigins = ['*']
      const isProduction = process.env.NODE_ENV === 'production'

      if (isProduction && allowedOrigins[0] === '*') {
        // In production, wildcard should be rejected
        expect(true).to.be.true // Would need actual server validation
      } else {
        // In development, wildcard is allowed
        expect(allowedOrigins[0]).to.equal('*')
      }
    })
  })

  describe('Rate Limiting', () => {
    it('should track failed authentication attempts', () => {
      const failedAttempts = new Map<string, { count: number; lastAttempt: number }>()
      const clientIp = '192.168.1.100'
      const maxAttempts = 5
      const windowMs = 15 * 60 * 1000 // 15 minutes

      // Simulate failed attempts
      for (let i = 0; i < 6; i++) {
        const attempts = failedAttempts.get(clientIp) || { count: 0, lastAttempt: 0 }
        attempts.count++
        attempts.lastAttempt = Date.now()
        failedAttempts.set(clientIp, attempts)
      }

      const attempts = failedAttempts.get(clientIp)!
      expect(attempts.count).to.be.greaterThan(maxAttempts)
    })

    it('should reset attempts after time window', () => {
      const now = Date.now()
      const windowMs = 15 * 60 * 1000 // 15 minutes
      const oldAttempt = now - windowMs - 1000 // 1 second past window
      const recentAttempt = now - 1000 // 1 second ago

      // Old attempt should be outside window
      expect(now - oldAttempt).to.be.greaterThan(windowMs)

      // Recent attempt should be inside window
      expect(now - recentAttempt).to.be.lessThan(windowMs)
    })
  })

  describe('Error Handling', () => {
    it('should not leak sensitive information in errors', () => {
      const sensitiveError = new Error('Database connection failed at 192.168.1.100:5432')
      const safeError = new Error('Failed to process request')

      // Errors should be generic in production
      expect(safeError.message).to.not.include('192.168.1.100')
      expect(safeError.message).to.not.include('Database')
    })

    it('should handle file operation errors safely', () => {
      const errorMessages = {
        generic: 'Failed to write file',
        detailed: "ENOENT: no such file or directory, open '/etc/passwd'",
      }

      // Production should use generic messages
      const isProduction = process.env.NODE_ENV === 'production'
      const errorToShow = isProduction ? errorMessages.generic : errorMessages.detailed

      if (isProduction) {
        expect(errorToShow).to.not.include('/etc/passwd')
      }
    })
  })

  describe('Data Sanitization', () => {
    it('should sanitize path separators', () => {
      const maliciousPaths = ['file/path/traversal.txt', 'file\\windows\\path.txt', 'mixed/path\\separators.txt']

      maliciousPaths.forEach(maliciousPath => {
        const sanitized = maliciousPath.replace(/[/\\]/g, '')
        expect(sanitized).to.not.include('/')
        expect(sanitized).to.not.include('\\')
      })
    })

    it('should handle unicode and special characters', () => {
      const specialChars = [
        'file\u0000name.txt', // Null byte
        'file\u202Ename.txt', // Right-to-left override
        'file<script>.txt', // HTML injection attempt
      ]

      specialChars.forEach(name => {
        // Should be sanitized or rejected
        expect(name).to.exist // Placeholder for actual sanitization logic
      })
    })
  })
})
