/**
 * Contract Test: Aster Signer Interface
 *
 * Tests the IAsterSigner contract to ensure it correctly implements
 * EIP-191 (Ethereum Signed Message Standard) signing for Aster Network.
 */

import { describe, test, expect, beforeEach } from '@jest/globals';
import { Platform, SignResult, ErrorType } from '../../src/types/credential.js';

// ============================================================================
// Interface Contracts to Test
// ============================================================================

/**
 * Aster平台签名器接口
 */
interface IAsterSigner {
  readonly platform: Platform.ASTER;

  /**
   * 对Aster网络交易进行签名
   * @param request Aster签名请求
   * @returns 签名结果，包含EIP-191格式签名
   */
  signTransaction(request: AsterSignRequest): Promise<AsterSignResponse>;

  /**
   * 对任意消息进行签名（EIP-191）
   * @param request 消息签名请求
   * @returns 签名结果
   */
  signMessage(request: AsterMessageSignRequest): Promise<AsterSignResponse>;

  /**
   * 验证Aster签名
   * @param request 验证请求
   * @returns 验证结果
   */
  verifySignature(request: AsterVerifyRequest): Promise<AsterVerifyResponse>;

  /**
   * 获取账户以太坊地址
   * @param accountId 账户ID
   * @returns 以太坊地址 (0x...)
   */
  getAddress(accountId: string): Promise<string>;

  /**
   * 批量签名交易
   * @param requests 批量签名请求
   * @returns 批量签名结果
   */
  signBatch(requests: AsterSignRequest[]): Promise<AsterSignResponse[]>;
}

// ============================================================================
// Request/Response Types
// ============================================================================

interface AsterSignRequest {
  accountId: string;
  transaction: AsterTransaction;
  options?: AsterSignOptions;
}

interface AsterMessageSignRequest {
  accountId: string;
  message: string | Uint8Array;
  options?: AsterSignOptions;
}

interface AsterSignOptions {
  timeout?: number;
  chainId?: number;
  gasLimit?: string;
  gasPrice?: string;
  nonce?: number;
}

interface AsterTransaction {
  to: string;
  value?: string;
  data?: string;
  gasLimit?: string;
  gasPrice?: string;
  nonce?: number;
  chainId?: number;
}

interface AsterSignResponse extends SignResult {
  signature: string;
  algorithm: 'ecdsa-secp256k1' | 'eip-191';
  address: string;
  chainId?: number;
  txHash?: string;
}

interface AsterVerifyRequest {
  message: string | Uint8Array;
  signature: string;
  address: string;
  algorithm?: 'ecdsa-secp256k1' | 'eip-191';
}

interface AsterVerifyResponse {
  valid: boolean;
  algorithm: 'ecdsa-secp256k1' | 'eip-191';
  address: string;
  timestamp: Date;
}

// ============================================================================
// Test Constants
// ============================================================================

const TEST_CREDENTIALS = {
  privateKey: '0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef12',
  address: '0x742d35Cc6634C0532925a3b8D8002a66a30a1234'
};

const SAMPLE_TRANSACTIONS = {
  transfer: {
    to: '0x742d35Cc6634C0532925a3b8D8002a66a30a5678',
    value: '1000000000000000000', // 1 ETH
    gasLimit: '21000',
    gasPrice: '20000000000', // 20 Gwei
    chainId: 592 // Astar Network
  },
  contractCall: {
    to: '0x1234567890123456789012345678901234567890',
    data: '0xa9059cbb000000000000000000000000742d35cc6634c0532925a3b8d8002a66a30a567800000000000000000000000000000000000000000000000000000000000f4240',
    gasLimit: '60000',
    gasPrice: '25000000000',
    chainId: 592
  }
};

const SAMPLE_MESSAGES = {
  simple: 'Hello, Aster Network!',
  json: JSON.stringify({ action: 'verify', timestamp: Date.now() }),
  binary: new Uint8Array([72, 101, 108, 108, 111, 32, 65, 115, 116, 101, 114])
};

// ============================================================================
// Mock Implementation for Testing
// ============================================================================

class MockAsterSigner implements IAsterSigner {
  readonly platform = Platform.ASTER;
  private accounts = new Map<string, any>();

  constructor() {
    // Add test account
    this.accounts.set('aster-test-001', {
      credentials: {
        type: 'aster',
        privateKey: TEST_CREDENTIALS.privateKey
      },
      address: TEST_CREDENTIALS.address
    });
  }

  async signTransaction(request: AsterSignRequest): Promise<AsterSignResponse> {
    const account = this.accounts.get(request.accountId);
    if (!account) {
      throw new Error(`Account ${request.accountId} not found`);
    }

    // Simulate ECDSA signing
    const signature = this.computeEcdsaSignature(
      this.serializeTransaction(request.transaction),
      account.credentials.privateKey
    );

    return {
      success: true,
      signature,
      algorithm: 'ecdsa-secp256k1',
      address: account.address,
      chainId: request.transaction.chainId,
      timestamp: new Date(),
      txHash: this.computeTransactionHash(request.transaction)
    };
  }

  async signMessage(request: AsterMessageSignRequest): Promise<AsterSignResponse> {
    const account = this.accounts.get(request.accountId);
    if (!account) {
      throw new Error(`Account ${request.accountId} not found`);
    }

    const message = typeof request.message === 'string'
      ? request.message
      : new TextDecoder().decode(request.message);

    // Simulate EIP-191 message signing
    const eip191Message = `\x19Ethereum Signed Message:\n${message.length}${message}`;
    const signature = this.computeEcdsaSignature(eip191Message, account.credentials.privateKey);

    return {
      success: true,
      signature,
      algorithm: 'eip-191',
      address: account.address,
      timestamp: new Date()
    };
  }

  async verifySignature(request: AsterVerifyRequest): Promise<AsterVerifyResponse> {
    // Simulate signature verification
    const isValid = this.verifyEcdsaSignature(
      request.message,
      request.signature,
      request.address
    );

    return {
      valid: isValid,
      algorithm: request.algorithm || 'eip-191',
      address: request.address,
      timestamp: new Date()
    };
  }

  async getAddress(accountId: string): Promise<string> {
    const account = this.accounts.get(accountId);
    if (!account) {
      throw new Error(`Account ${accountId} not found`);
    }
    return account.address;
  }

  async signBatch(requests: AsterSignRequest[]): Promise<AsterSignResponse[]> {
    return Promise.all(requests.map(req => this.signTransaction(req)));
  }

  private serializeTransaction(tx: AsterTransaction): string {
    return JSON.stringify({
      to: tx.to,
      value: tx.value || '0',
      data: tx.data || '0x',
      gasLimit: tx.gasLimit,
      gasPrice: tx.gasPrice,
      nonce: tx.nonce,
      chainId: tx.chainId
    });
  }

  private computeEcdsaSignature(message: string, privateKey: string): string {
    // Simulate ECDSA signature computation
    const hash = this.keccak256(message);
    return `0x${hash.substring(0, 130)}01`; // Mock signature with recovery id
  }

  private verifyEcdsaSignature(message: string | Uint8Array, signature: string, address: string): boolean {
    // Simulate signature verification
    return signature.length === 132 && address.length === 42 && signature.startsWith('0x');
  }

  private computeTransactionHash(tx: AsterTransaction): string {
    return this.keccak256(this.serializeTransaction(tx));
  }

  private keccak256(data: string): string {
    // Simulate Keccak256 hash
    return `0x${data.length.toString(16).padStart(64, '0')}${Date.now().toString(16).padStart(64, '0')}`;
  }
}

// ============================================================================
// Contract Tests
// ============================================================================

describe('IAsterSigner Contract Tests', () => {
  let signer: IAsterSigner;

  beforeEach(() => {
    signer = new MockAsterSigner();
  });

  describe('Platform Identification', () => {
    test('should identify as ASTER platform', () => {
      expect(signer.platform).toBe(Platform.ASTER);
    });
  });

  describe('Transaction Signing', () => {
    test('should sign ETH transfer transaction', async () => {
      const request: AsterSignRequest = {
        accountId: 'aster-test-001',
        transaction: SAMPLE_TRANSACTIONS.transfer
      };

      const result = await signer.signTransaction(request);

      expect(result.success).toBe(true);
      expect(result.signature).toBeDefined();
      expect(result.signature).toMatch(/^0x[0-9a-fA-F]{130}$/);
      expect(result.algorithm).toBe('ecdsa-secp256k1');
      expect(result.address).toBe(TEST_CREDENTIALS.address);
      expect(result.chainId).toBe(592);
      expect(result.txHash).toBeDefined();
    });

    test('should sign contract call transaction', async () => {
      const request: AsterSignRequest = {
        accountId: 'aster-test-001',
        transaction: SAMPLE_TRANSACTIONS.contractCall
      };

      const result = await signer.signTransaction(request);

      expect(result.success).toBe(true);
      expect(result.signature).toBeDefined();
      expect(result.algorithm).toBe('ecdsa-secp256k1');
      expect(result.address).toBe(TEST_CREDENTIALS.address);
    });

    test('should fail for non-existent account', async () => {
      const request: AsterSignRequest = {
        accountId: 'non-existent-account',
        transaction: SAMPLE_TRANSACTIONS.transfer
      };

      await expect(signer.signTransaction(request)).rejects.toThrow('Account non-existent-account not found');
    });

    test('should handle transaction with options', async () => {
      const request: AsterSignRequest = {
        accountId: 'aster-test-001',
        transaction: SAMPLE_TRANSACTIONS.transfer,
        options: {
          timeout: 10000,
          chainId: 592,
          gasLimit: '25000'
        }
      };

      const result = await signer.signTransaction(request);

      expect(result.success).toBe(true);
      expect(result.chainId).toBe(592);
    });
  });

  describe('Message Signing (EIP-191)', () => {
    test('should sign string message', async () => {
      const request: AsterMessageSignRequest = {
        accountId: 'aster-test-001',
        message: SAMPLE_MESSAGES.simple
      };

      const result = await signer.signMessage(request);

      expect(result.success).toBe(true);
      expect(result.signature).toBeDefined();
      expect(result.algorithm).toBe('eip-191');
      expect(result.address).toBe(TEST_CREDENTIALS.address);
    });

    test('should sign JSON message', async () => {
      const request: AsterMessageSignRequest = {
        accountId: 'aster-test-001',
        message: SAMPLE_MESSAGES.json
      };

      const result = await signer.signMessage(request);

      expect(result.success).toBe(true);
      expect(result.algorithm).toBe('eip-191');
    });

    test('should sign binary message', async () => {
      const request: AsterMessageSignRequest = {
        accountId: 'aster-test-001',
        message: SAMPLE_MESSAGES.binary
      };

      const result = await signer.signMessage(request);

      expect(result.success).toBe(true);
      expect(result.algorithm).toBe('eip-191');
    });

    test('should fail for non-existent account', async () => {
      const request: AsterMessageSignRequest = {
        accountId: 'non-existent-account',
        message: SAMPLE_MESSAGES.simple
      };

      await expect(signer.signMessage(request)).rejects.toThrow('Account non-existent-account not found');
    });
  });

  describe('Signature Verification', () => {
    test('should verify valid signature', async () => {
      const request: AsterVerifyRequest = {
        message: SAMPLE_MESSAGES.simple,
        signature: '0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef121234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef1201',
        address: TEST_CREDENTIALS.address
      };

      const result = await signer.verifySignature(request);

      expect(result.valid).toBe(true);
      expect(result.algorithm).toBe('eip-191');
      expect(result.address).toBe(TEST_CREDENTIALS.address);
      expect(result.timestamp).toBeInstanceOf(Date);
    });

    test('should reject invalid signature format', async () => {
      const request: AsterVerifyRequest = {
        message: SAMPLE_MESSAGES.simple,
        signature: 'invalid_signature',
        address: TEST_CREDENTIALS.address
      };

      const result = await signer.verifySignature(request);

      expect(result.valid).toBe(false);
    });

    test('should handle binary message verification', async () => {
      const request: AsterVerifyRequest = {
        message: SAMPLE_MESSAGES.binary,
        signature: '0x1234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef121234567890abcdef1234567890abcdef1234567890abcdef1234567890abcdef1201',
        address: TEST_CREDENTIALS.address,
        algorithm: 'eip-191'
      };

      const result = await signer.verifySignature(request);

      expect(result.algorithm).toBe('eip-191');
    });
  });

  describe('Address Management', () => {
    test('should return address for valid account', async () => {
      const address = await signer.getAddress('aster-test-001');

      expect(address).toBe(TEST_CREDENTIALS.address);
      expect(address).toMatch(/^0x[0-9a-fA-F]{40}$/);
    });

    test('should fail for non-existent account', async () => {
      await expect(signer.getAddress('non-existent-account')).rejects.toThrow('Account non-existent-account not found');
    });
  });

  describe('Batch Operations', () => {
    test('should handle batch transaction signing', async () => {
      const requests: AsterSignRequest[] = [
        {
          accountId: 'aster-test-001',
          transaction: SAMPLE_TRANSACTIONS.transfer
        },
        {
          accountId: 'aster-test-001',
          transaction: SAMPLE_TRANSACTIONS.contractCall
        }
      ];

      const results = await signer.signBatch(requests);

      expect(results).toHaveLength(2);
      expect(results[0].success).toBe(true);
      expect(results[1].success).toBe(true);
      expect(results[0].algorithm).toBe('ecdsa-secp256k1');
      expect(results[1].algorithm).toBe('ecdsa-secp256k1');
    });

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

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

  describe('Performance Requirements', () => {
    test('should complete transaction signing within 50ms', async () => {
      const request: AsterSignRequest = {
        accountId: 'aster-test-001',
        transaction: SAMPLE_TRANSACTIONS.transfer
      };

      const startTime = Date.now();
      const result = await signer.signTransaction(request);
      const duration = Date.now() - startTime;

      expect(result.success).toBe(true);
      expect(duration).toBeLessThan(50);
    });

    test('should complete message signing within 50ms', async () => {
      const request: AsterMessageSignRequest = {
        accountId: 'aster-test-001',
        message: SAMPLE_MESSAGES.simple
      };

      const startTime = Date.now();
      const result = await signer.signMessage(request);
      const duration = Date.now() - startTime;

      expect(result.success).toBe(true);
      expect(duration).toBeLessThan(50);
    });

    test('should handle concurrent requests', async () => {
      const requests = Array.from({ length: 10 }, () => ({
        accountId: 'aster-test-001',
        transaction: SAMPLE_TRANSACTIONS.transfer
      }));

      const startTime = Date.now();
      const results = await Promise.all(
        requests.map(req => signer.signTransaction(req))
      );
      const duration = Date.now() - startTime;

      expect(results).toHaveLength(10);
      expect(results.every(r => r.success)).toBe(true);
      expect(duration).toBeLessThan(200); // 10 concurrent requests < 200ms
    });
  });

  describe('Error Handling', () => {
    test('should handle malformed transaction gracefully', async () => {
      const request = {
        accountId: 'aster-test-001',
        transaction: {
          to: 'invalid_address',
          value: 'invalid_value'
        } as any
      };

      // Should not throw, but might return error in response
      try {
        const result = await signer.signTransaction(request);
        // If it succeeds, check success flag
        if (!result.success) {
          expect(result.error).toBeDefined();
        }
      } catch (error) {
        // If it throws, that's also acceptable
        expect(error).toBeInstanceOf(Error);
      }
    });

    test('should handle empty message', async () => {
      const request: AsterMessageSignRequest = {
        accountId: 'aster-test-001',
        message: ''
      };

      const result = await signer.signMessage(request);

      expect(result.success).toBe(true);
      expect(result.algorithm).toBe('eip-191');
    });

    test('should handle large message', async () => {
      const largeMessage = 'A'.repeat(10000); // 10KB message

      const request: AsterMessageSignRequest = {
        accountId: 'aster-test-001',
        message: largeMessage
      };

      const result = await signer.signMessage(request);

      expect(result.success).toBe(true);
    });
  });
});

// ============================================================================
// Integration Hints for Implementation
// ============================================================================

/**
 * Implementation Notes:
 *
 * 1. ECDSA secp256k1 Algorithm:
 *    - Use ethers.js or noble-secp256k1 library
 *    - Generate recoverable signatures (v, r, s format)
 *    - Support both transaction and message signing
 *
 * 2. EIP-191 Message Signing:
 *    - Prefix: "\x19Ethereum Signed Message:\n{message_length}{message}"
 *    - Use Keccak256 for hashing
 *    - Return signature in 0x format
 *
 * 3. Transaction Serialization:
 *    - RLP encoding for raw transactions
 *    - Include chainId for EIP-155 protection
 *    - Handle legacy and EIP-1559 transaction types
 *
 * 4. Performance Requirements:
 *    - Individual signing: < 50ms
 *    - Batch operations: optimize for concurrent requests
 *    - Consider WebWorkers for CPU-intensive operations
 *
 * 5. Security Considerations:
 *    - Validate transaction parameters
 *    - Check gas limits and prices
 *    - Implement replay protection
 *    - Never log private keys
 *
 * 6. Aster Network Specifics:
 *    - Chain ID: 592 (mainnet), 81 (testnet)
 *    - Support for both EVM and WASM contracts
 *    - Gas mechanics similar to Ethereum
 */