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

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

// Import types from contract (this import will fail until types are implemented)
import type {
  IPacificaSigner,
  PacificaSignRequest,
  PacificaSignResponse,
  PacificaVerifyRequest,
  PacificaVerifyResponse,
  PacificaOrderType,
  PacificaOrderMessage,
  PacificaCancelMessage,
  PacificaSignerMetrics,
  PACIFICA_CONSTANTS
} from '@/specs/001-credential-manager/contracts/pacifica-signer';
import type { Platform } from '@/specs/001-credential-manager/contracts/credential-manager';

describe('IPacificaSigner Contract Tests', () => {
  let pacificaSigner: IPacificaSigner;
  const testAccountId = 'test-pacifica-account';

  beforeEach(async () => {
    // This will fail until PacificaSigner is implemented
    const { PacificaSigner } = await import('@/core/credential-manager/signers/PacificaSigner');
    pacificaSigner = new PacificaSigner();
  });

  afterEach(() => {
    // Cleanup if needed
  });

  describe('Interface Properties', () => {
    test('should have correct platform type', () => {
      expect(pacificaSigner.platform).toBe(Platform.PACIFICA);
    });
  });

  describe('Order Signing', () => {
    test('should sign market order successfully', async () => {
      // Arrange
      const orderMessage: PacificaOrderMessage = {
        order_type: PacificaOrderType.MARKET,
        symbol: 'BTC-USD',
        side: 'buy',
        size: '0.1',
        timestamp: Date.now()
      };

      const signRequest: PacificaSignRequest = {
        accountId: testAccountId,
        message: new TextEncoder().encode(JSON.stringify(orderMessage)),
        orderType: PacificaOrderType.MARKET,
        options: {
          timeout: 5000,
          includeTimestamp: true,
          encoding: 'base64'
        }
      };

      // Act
      const result: PacificaSignResponse = await pacificaSigner.signOrder(signRequest);

      // Assert
      expect(result).toBeDefined();
      expect(result.success).toBe(true);
      expect(result.algorithm).toBe('ed25519');
      expect(result.orderType).toBe(PacificaOrderType.MARKET);
      expect(typeof result.signature).toBe('string');
      expect(result.signature.length).toBe(PACIFICA_CONSTANTS.SIGNATURE_BASE64_LENGTH);
      expect(typeof result.publicKey).toBe('string');
      expect(result.publicKey.length).toBe(PACIFICA_CONSTANTS.PUBLIC_KEY_BASE58_LENGTH);
      expect(result.timestamp).toBeInstanceOf(Date);
    });

    test('should sign limit order successfully', async () => {
      // Arrange
      const orderMessage: PacificaOrderMessage = {
        order_type: PacificaOrderType.LIMIT,
        symbol: 'ETH-USD',
        side: 'sell',
        size: '1.0',
        price: '2000.50',
        client_id: 'test-order-001',
        timestamp: Date.now()
      };

      const signRequest: PacificaSignRequest = {
        accountId: testAccountId,
        message: new TextEncoder().encode(JSON.stringify(orderMessage)),
        orderType: PacificaOrderType.LIMIT
      };

      // Act
      const result: PacificaSignResponse = await pacificaSigner.signOrder(signRequest);

      // Assert
      expect(result.success).toBe(true);
      expect(result.algorithm).toBe('ed25519');
      expect(result.orderType).toBe(PacificaOrderType.LIMIT);
      expect(typeof result.signature).toBe('string');
      expect(typeof result.publicKey).toBe('string');
    });

    test('should sign cancel order successfully', async () => {
      // Arrange
      const cancelMessage: PacificaCancelMessage = {
        order_type: 'cancel',
        order_id: 'order-123',
        timestamp: Date.now()
      };

      const signRequest: PacificaSignRequest = {
        accountId: testAccountId,
        message: new TextEncoder().encode(JSON.stringify(cancelMessage)),
        orderType: PacificaOrderType.CANCEL
      };

      // Act
      const result: PacificaSignResponse = await pacificaSigner.signOrder(signRequest);

      // Assert
      expect(result.success).toBe(true);
      expect(result.orderType).toBe(PacificaOrderType.CANCEL);
    });

    test('should handle signing failure gracefully', async () => {
      // Arrange - invalid account
      const signRequest: PacificaSignRequest = {
        accountId: 'non-existent-account',
        message: new Uint8Array([1, 2, 3]),
        orderType: PacificaOrderType.MARKET
      };

      // Act
      const result: PacificaSignResponse = await pacificaSigner.signOrder(signRequest);

      // Assert
      expect(result.success).toBe(false);
      expect(typeof result.error).toBe('string');
      expect(result.signature).toBeUndefined();
    });

    test('should meet performance requirements for signing', async () => {
      // Performance requirement: signing < 50ms
      const signRequest: PacificaSignRequest = {
        accountId: testAccountId,
        message: new Uint8Array([1, 2, 3, 4, 5]),
        orderType: PacificaOrderType.MARKET
      };

      const startTime = Date.now();
      await pacificaSigner.signOrder(signRequest);
      const duration = Date.now() - startTime;

      // Performance contract: < 50ms
      expect(duration).toBeLessThan(50);
    });
  });

  describe('Signature Verification', () => {
    test('should verify valid signature', async () => {
      // Arrange
      const message = new Uint8Array([1, 2, 3, 4, 5]);
      const signRequest: PacificaSignRequest = {
        accountId: testAccountId,
        message,
        orderType: PacificaOrderType.MARKET
      };

      // First, create a signature
      const signResult = await pacificaSigner.signOrder(signRequest);
      expect(signResult.success).toBe(true);

      const verifyRequest: PacificaVerifyRequest = {
        accountId: testAccountId,
        message,
        signature: signResult.signature!,
        publicKey: signResult.publicKey!,
        orderType: PacificaOrderType.MARKET
      };

      // Act
      const verifyResult: PacificaVerifyResponse = await pacificaSigner.verifySignature(verifyRequest);

      // Assert
      expect(verifyResult.isValid).toBe(true);
      expect(verifyResult.algorithm).toBe('ed25519');
      expect(verifyResult.publicKey).toBe(signResult.publicKey);
    });

    test('should reject invalid signature', async () => {
      // Arrange
      const verifyRequest: PacificaVerifyRequest = {
        accountId: testAccountId,
        message: new Uint8Array([1, 2, 3, 4, 5]),
        signature: 'invalid-signature',
        publicKey: 'invalid-public-key'
      };

      // Act
      const result: PacificaVerifyResponse = await pacificaSigner.verifySignature(verifyRequest);

      // Assert
      expect(result.isValid).toBe(false);
      expect(result.algorithm).toBe('ed25519');
    });
  });

  describe('Public Key Management', () => {
    test('should get public key for valid account', async () => {
      // Act
      const publicKey = await pacificaSigner.getPublicKey(testAccountId);

      // Assert
      expect(typeof publicKey).toBe('string');
      expect(publicKey.length).toBe(PACIFICA_CONSTANTS.PUBLIC_KEY_BASE58_LENGTH);
    });

    test('should handle non-existent account', async () => {
      // Act & Assert
      await expect(pacificaSigner.getPublicKey('non-existent-account'))
        .rejects.toThrow();
    });
  });

  describe('Batch Signing', () => {
    test('should sign multiple orders in batch', async () => {
      // Arrange
      const requests: PacificaSignRequest[] = [
        {
          accountId: testAccountId,
          message: new Uint8Array([1, 2, 3]),
          orderType: PacificaOrderType.MARKET
        },
        {
          accountId: testAccountId,
          message: new Uint8Array([4, 5, 6]),
          orderType: PacificaOrderType.LIMIT
        },
        {
          accountId: testAccountId,
          message: new Uint8Array([7, 8, 9]),
          orderType: PacificaOrderType.CANCEL
        }
      ];

      // Act
      const results: PacificaSignResponse[] = await pacificaSigner.signBatch(requests);

      // Assert
      expect(results).toHaveLength(3);
      results.forEach((result, index) => {
        expect(result.success).toBe(true);
        expect(result.algorithm).toBe('ed25519');
        expect(result.orderType).toBe(requests[index].orderType);
        expect(typeof result.signature).toBe('string');
        expect(typeof result.publicKey).toBe('string');
      });
    });

    test('should handle empty batch', async () => {
      // Act
      const results = await pacificaSigner.signBatch([]);

      // Assert
      expect(results).toHaveLength(0);
    });

    test('should enforce batch size limits', async () => {
      // Arrange - exceed max batch size
      const requests: PacificaSignRequest[] = Array(PACIFICA_CONSTANTS.MAX_BATCH_SIZE + 1)
        .fill(null)
        .map((_, index) => ({
          accountId: testAccountId,
          message: new Uint8Array([index]),
          orderType: PacificaOrderType.MARKET
        }));

      // Act & Assert
      await expect(pacificaSigner.signBatch(requests))
        .rejects.toThrow();
    });

    test('should meet performance requirements for batch signing', async () => {
      // Performance requirement: batch of 10 should complete < 200ms
      const requests: PacificaSignRequest[] = Array(10)
        .fill(null)
        .map((_, index) => ({
          accountId: testAccountId,
          message: new Uint8Array([index]),
          orderType: PacificaOrderType.MARKET
        }));

      const startTime = Date.now();
      await pacificaSigner.signBatch(requests);
      const duration = Date.now() - startTime;

      // Performance contract: batch of 10 < 200ms
      expect(duration).toBeLessThan(200);
    });
  });

  describe('Error Handling', () => {
    test('should handle invalid message format', async () => {
      // Arrange
      const signRequest: PacificaSignRequest = {
        accountId: testAccountId,
        message: new Uint8Array(PACIFICA_CONSTANTS.MAX_MESSAGE_SIZE + 1), // Too large
        orderType: PacificaOrderType.MARKET
      };

      // Act
      const result = await pacificaSigner.signOrder(signRequest);

      // Assert
      expect(result.success).toBe(false);
      expect(typeof result.error).toBe('string');
    });

    test('should handle timeout gracefully', async () => {
      // Arrange
      const signRequest: PacificaSignRequest = {
        accountId: testAccountId,
        message: new Uint8Array([1, 2, 3]),
        orderType: PacificaOrderType.MARKET,
        options: {
          timeout: 1 // Very short timeout
        }
      };

      // Act
      const result = await pacificaSigner.signOrder(signRequest);

      // Assert - either succeeds quickly or fails with timeout
      if (!result.success) {
        expect(typeof result.error).toBe('string');
      }
    });

    test('should validate order types', async () => {
      // Test all valid order types
      const orderTypes = Object.values(PacificaOrderType);

      for (const orderType of orderTypes) {
        const signRequest: PacificaSignRequest = {
          accountId: testAccountId,
          message: new Uint8Array([1, 2, 3]),
          orderType
        };

        const result = await pacificaSigner.signOrder(signRequest);
        // Should not throw, may succeed or fail based on account state
        expect(typeof result.success).toBe('boolean');
      }
    });
  });

  describe('Constants Validation', () => {
    test('should have correct constant values', () => {
      expect(PACIFICA_CONSTANTS.PRIVATE_KEY_LENGTH).toBe(32);
      expect(PACIFICA_CONSTANTS.PUBLIC_KEY_LENGTH).toBe(32);
      expect(PACIFICA_CONSTANTS.SIGNATURE_LENGTH).toBe(64);
      expect(PACIFICA_CONSTANTS.PRIVATE_KEY_HEX_LENGTH).toBe(64);
      expect(PACIFICA_CONSTANTS.PUBLIC_KEY_BASE58_LENGTH).toBe(44);
      expect(PACIFICA_CONSTANTS.SIGNATURE_BASE64_LENGTH).toBe(88);
      expect(PACIFICA_CONSTANTS.MAX_MESSAGE_SIZE).toBe(1024 * 1024);
      expect(PACIFICA_CONSTANTS.DEFAULT_SIGN_TIMEOUT).toBe(30000);
      expect(PACIFICA_CONSTANTS.MAX_BATCH_SIZE).toBe(100);
    });
  });
});