/**
 * Contract test for IPacificaSigner interface
 *
 * This test verifies that any implementation of IPacificaSigner
 * adheres to the contract defined in the pacifica-signer specifications.
 *
 * Tests MUST FAIL initially until implementation is provided.
 */

import { describe, test, expect, beforeEach } from '@jest/globals'

// Import types that will be implemented
import { Platform, SignatureType } from '@/types/credential'
import type { PacificaSigner } from '@/core/credential-manager/signers/PacificaSigner'

describe('IPacificaSigner Contract Tests', () => {
  let pacificaSigner: PacificaSigner

  beforeEach(async () => {
    // Import the implemented PacificaSigner
    const { PacificaSigner: PacificaSignerClass } = await import('@/core/credential-manager/signers/PacificaSigner')
    pacificaSigner = new PacificaSignerClass()
  })

  describe('Platform Identification', () => {
    test('should identify as Pacifica platform', () => {
      expect(pacificaSigner.platform).toBe(Platform.PACIFICA)
    })

    test('should use Ed25519 signature algorithm', () => {
      expect(pacificaSigner.algorithm).toBe(SignatureType.ED25519)
    })
  })

  describe('Key Management', () => {
    test('should validate private key format', async () => {
      // Valid 64-character hex key
      const validKey = 'f26670e2ca334117f8859f9f32e50251641953a30b54f6ffcf82db836cfdfea5'
      const result = await pacificaSigner.validatePrivateKey(validKey)
      expect(result).toBe(true)
    })

    test('should reject invalid private key format', async () => {
      // Invalid key (too short)
      const invalidKey = 'invalidkey123'
      const result = await pacificaSigner.validatePrivateKey(invalidKey)
      expect(result).toBe(false)
    })

    test('should derive public key from private key', async () => {
      const privateKey = 'f26670e2ca334117f8859f9f32e50251641953a30b54f6ffcf82db836cfdfea5'
      const publicKey = await pacificaSigner.derivePublicKey(privateKey)

      expect(publicKey).toBeDefined()
      expect(typeof publicKey).toBe('string')
      expect(publicKey.length).toBeGreaterThan(0)
    })
  })

  describe('Signing Operations', () => {
    test('should sign message successfully', async () => {
      const credentials = {
        type: 'ed25519' as const,
        privateKey: 'f26670e2ca334117f8859f9f32e50251641953a30b54f6ffcf82db836cfdfea5'
      }
      const message = new TextEncoder().encode('Hello Pacifica!')

      const signature = await pacificaSigner.sign(message, credentials)

      expect(typeof signature).toBe('string')
      expect(signature.length).toBeGreaterThan(0)
    })

    test('should meet performance requirements for signing', async () => {
      const credentials = {
        type: 'ed25519' as const,
        privateKey: 'f26670e2ca334117f8859f9f32e50251641953a30b54f6ffcf82db836cfdfea5'
      }
      const message = new TextEncoder().encode('Performance test message')

      const startTime = Date.now()
      await pacificaSigner.sign(message, credentials)
      const duration = Date.now() - startTime

      // Performance requirement: signing < 50ms
      expect(duration).toBeLessThan(50)
    })

    test('should handle signing errors gracefully', async () => {
      const invalidCredentials = {
        type: 'ed25519' as const,
        privateKey: 'invalid_key'
      }
      const message = new TextEncoder().encode('Test message')

      await expect(pacificaSigner.sign(message, invalidCredentials))
        .rejects.toThrow()
    })
  })

  describe('Verification Operations', () => {
    test('should verify valid signature', async () => {
      const credentials = {
        type: 'ed25519' as const,
        privateKey: 'f26670e2ca334117f8859f9f32e50251641953a30b54f6ffcf82db836cfdfea5'
      }
      const message = new TextEncoder().encode('Hello Pacifica!')

      // Sign message
      const signature = await pacificaSigner.sign(message, credentials)

      // Derive public key for verification
      const publicKey = await pacificaSigner.derivePublicKey(credentials.privateKey)

      // Verify signature
      const isValid = await pacificaSigner.verify(message, signature, publicKey)
      expect(isValid).toBe(true)
    })

    test('should reject invalid signature', async () => {
      const message = new TextEncoder().encode('Hello Pacifica!')
      const invalidSignature = 'invalid_signature_string'
      const publicKey = 'valid_public_key'

      const isValid = await pacificaSigner.verify(message, invalidSignature, publicKey)
      expect(isValid).toBe(false)
    })
  })

  describe('Batch Operations', () => {
    test('should support batch signing', async () => {
      const credentials = {
        type: 'ed25519' as const,
        privateKey: 'f26670e2ca334117f8859f9f32e50251641953a30b54f6ffcf82db836cfdfea5'
      }

      const messages = [
        new TextEncoder().encode('Message 1'),
        new TextEncoder().encode('Message 2'),
        new TextEncoder().encode('Message 3')
      ]

      if (typeof pacificaSigner.signBatch === 'function') {
        const signatures = await pacificaSigner.signBatch(messages, credentials)

        expect(Array.isArray(signatures)).toBe(true)
        expect(signatures.length).toBe(messages.length)
        signatures.forEach(sig => {
          expect(typeof sig).toBe('string')
          expect(sig.length).toBeGreaterThan(0)
        })
      } else {
        // If batch signing not implemented, should fall back to individual signing
        const signatures = await Promise.all(
          messages.map(msg => pacificaSigner.sign(msg, credentials))
        )

        expect(signatures.length).toBe(messages.length)
      }
    })
  })

  describe('Error Handling', () => {
    test('should handle malformed credentials gracefully', async () => {
      const malformedCredentials = {
        type: 'invalid' as any,
        privateKey: null as any
      }
      const message = new TextEncoder().encode('Test message')

      await expect(pacificaSigner.sign(message, malformedCredentials))
        .rejects.toThrow()
    })

    test('should handle empty messages gracefully', async () => {
      const credentials = {
        type: 'ed25519' as const,
        privateKey: 'f26670e2ca334117f8859f9f32e50251641953a30b54f6ffcf82db836cfdfea5'
      }
      const emptyMessage = new Uint8Array(0)

      // Should either succeed or throw a clear error
      try {
        const signature = await pacificaSigner.sign(emptyMessage, credentials)
        expect(typeof signature).toBe('string')
      } catch (error) {
        expect(error).toBeInstanceOf(Error)
      }
    })
  })

  describe('Contract Compliance', () => {
    test('should implement all required methods', () => {
      // Check that all required methods exist
      expect(typeof pacificaSigner.sign).toBe('function')
      expect(typeof pacificaSigner.verify).toBe('function')
      expect(typeof pacificaSigner.validatePrivateKey).toBe('function')
      expect(typeof pacificaSigner.derivePublicKey).toBe('function')
    })

    test('should have proper platform and algorithm properties', () => {
      expect(pacificaSigner.platform).toBeDefined()
      expect(pacificaSigner.algorithm).toBeDefined()
      expect(pacificaSigner.platform).toBe(Platform.PACIFICA)
      expect(pacificaSigner.algorithm).toBe(SignatureType.ED25519)
    })
  })
})