/**
 * Integration tests for transaction flow
 */

import { TransactionContext } from "../../contexts/TransactionContext";
import {
  validateTransactionRequest,
  validateAddress,
  validateTransactionValue,
  validateTransactionData,
  RateLimiter,
} from "../../utils/security";
import { TransactionExecutionMethod, TransactionStatus } from "../../types";
import { ethers } from "ethers";
import { TEST_ADDRESSES } from "../test-constants";

// Mock provider
class MockProvider extends ethers.providers.BaseProvider {
  constructor() {
    super(ethers.providers.getNetwork(1)); // Mainnet network
  }
  
  async estimateGas(tx: any) {
    return ethers.BigNumber.from("21000");
  }
  
  async getFeeData() {
    return {
      gasPrice: ethers.BigNumber.from("20000000000"), // 20 gwei
      maxFeePerGas: ethers.BigNumber.from("30000000000"),
      maxPriorityFeePerGas: ethers.BigNumber.from("2000000000"),
      lastBaseFeePerGas: ethers.BigNumber.from("28000000000"), // Required for FeeData type
    };
  }
  
  async getTransactionCount(address: string) {
    return 0;
  }
  
  async perform(method: string, params: any): Promise<any> {
    throw new Error("Not implemented");
  }
}

describe("Transaction Flow Integration Tests", () => {
  let provider: MockProvider;
  let rateLimiter: RateLimiter;

  beforeEach(() => {
    provider = new MockProvider();
    rateLimiter = new RateLimiter(10, 60000);
    if (typeof window !== "undefined") {
      localStorage.clear();
    }
  });

  describe("Transaction Creation Flow", () => {
    it("should create valid transaction", () => {
      const tx = {
        from: TEST_ADDRESSES.ADDRESS_1,
        to: TEST_ADDRESSES.ADDRESS_2,
        value: "1000000000000000000", // 1 ETH
        data: "0x",
      };

      const validation = validateTransactionRequest(tx);
      expect(validation.valid).toBe(true);
      expect(validation.errors.length).toBe(0);
    });

    it("should reject transaction with invalid from address", () => {
      const tx = {
        from: "invalid-address",
        to: TEST_ADDRESSES.ADDRESS_2,
        value: "1000000000000000000",
        data: "0x",
      };

      const validation = validateTransactionRequest(tx);
      expect(validation.valid).toBe(false);
      expect(validation.errors.length).toBeGreaterThan(0);
    });

    it("should reject transaction with invalid to address", () => {
      const tx = {
        from: TEST_ADDRESSES.ADDRESS_1,
        to: "invalid-address",
        value: "1000000000000000000",
        data: "0x",
      };

      const validation = validateTransactionRequest(tx);
      expect(validation.valid).toBe(false);
      expect(validation.errors.length).toBeGreaterThan(0);
    });

    it("should reject transaction with invalid value", () => {
      const tx = {
        from: TEST_ADDRESSES.ADDRESS_1,
        to: TEST_ADDRESSES.ADDRESS_2,
        value: "1000000000000000000000001", // > 1M ETH
        data: "0x",
      };

      const valueValidation = validateTransactionValue(tx.value);
      expect(valueValidation.valid).toBe(false);
    });

    it("should reject transaction with invalid data", () => {
      const tx = {
        from: TEST_ADDRESSES.ADDRESS_1,
        to: TEST_ADDRESSES.ADDRESS_2,
        value: "0",
        data: "0x" + "a".repeat(10001), // Too large
      };

      const dataValidation = validateTransactionData(tx.data);
      expect(dataValidation.valid).toBe(false);
    });

    it("should enforce rate limiting", () => {
      const key = TEST_ADDRESSES.ADDRESS_1;

      // Make 10 requests (at limit)
      for (let i = 0; i < 10; i++) {
        expect(rateLimiter.checkLimit(key)).toBe(true);
      }

      // 11th request should be rejected
      expect(rateLimiter.checkLimit(key)).toBe(false);
    });
  });

  describe("Transaction Approval Flow", () => {
    it("should track approvals correctly", () => {
      const transactionId = "tx_123";
      const approvals: Array<{ approver: string; approved: boolean }> = [];
      const threshold = 2;

      // First approval
      approvals.push({
        approver: "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb",
        approved: true,
      });
      expect(approvals.filter(a => a.approved).length).toBe(1);
      expect(approvals.filter(a => a.approved).length).toBeLessThan(threshold);

      // Second approval
      approvals.push({
        approver: "0x8ba1f109551bD432803012645Hac136c22C9e8",
        approved: true,
      });
      expect(approvals.filter(a => a.approved).length).toBe(2);
      expect(approvals.filter(a => a.approved).length).toBeGreaterThanOrEqual(threshold);
    });

    it("should prevent duplicate approvals", () => {
      const approvals: Array<{ approver: string; approved: boolean }> = [];
      const approver = TEST_ADDRESSES.ADDRESS_1;

      // First approval
      approvals.push({ approver, approved: true });

      // Check for duplicate
      const isDuplicate = approvals.some(
        a => a.approver.toLowerCase() === approver.toLowerCase() && a.approved
      );
      expect(isDuplicate).toBe(true);

      // Should not allow duplicate
      if (isDuplicate) {
        // In real implementation, this would throw an error
        expect(true).toBe(true);
      }
    });

    it("should handle rejection", () => {
      const approvals: Array<{ approver: string; approved: boolean }> = [];

      approvals.push({
        approver: TEST_ADDRESSES.ADDRESS_1,
        approved: false,
      });

      expect(approvals.filter(a => a.approved).length).toBe(0);
    });
  });

  describe("Transaction Execution Flow", () => {
    it("should estimate gas correctly", async () => {
      const tx = {
        from: TEST_ADDRESSES.ADDRESS_1,
        to: TEST_ADDRESSES.ADDRESS_2,
        value: "1000000000000000000",
        data: "0x",
      };

      const gasEstimate = await provider.estimateGas(tx);
      expect(gasEstimate.gt(0)).toBe(true);
      expect(gasEstimate.gte(21000)).toBe(true); // Minimum gas
    });

    it("should get fee data", async () => {
      const feeData = await provider.getFeeData();
      expect(feeData.gasPrice).toBeDefined();
      expect(feeData.gasPrice!.gt(0)).toBe(true);
    });

    it("should validate transaction before execution", () => {
      // Use valid Ethereum addresses from test constants
      const tx = {
        from: TEST_ADDRESSES.ADDRESS_1,
        to: TEST_ADDRESSES.ADDRESS_2,
        value: "1000000000000000000",
        data: "0x",
      };

      const validation = validateTransactionRequest(tx);
      expect(validation.valid).toBe(true);

      // Transaction should only execute if valid
      if (validation.valid) {
        expect(true).toBe(true); // Would proceed to execution
      }
    });
  });

  describe("Transaction Deduplication", () => {
    it("should detect duplicate transactions", () => {
      // Use valid Ethereum addresses from test constants
      const from = TEST_ADDRESSES.ADDRESS_1;
      const to = TEST_ADDRESSES.ADDRESS_2;
      
      const tx1 = {
        from,
        to,
        value: "1000000000000000000",
        data: "0x",
        nonce: 0,
      };

      const tx2 = {
        from,
        to,
        value: "1000000000000000000",
        data: "0x",
        nonce: 0,
      };

      // Generate hash for comparison
      const hash1 = ethers.utils.keccak256(
        ethers.utils.defaultAbiCoder.encode(
          ["address", "address", "uint256", "bytes", "uint256"],
          [tx1.from, tx1.to, tx1.value, tx1.data, tx1.nonce]
        )
      );

      const hash2 = ethers.utils.keccak256(
        ethers.utils.defaultAbiCoder.encode(
          ["address", "address", "uint256", "bytes", "uint256"],
          [tx2.from, tx2.to, tx2.value, tx2.data, tx2.nonce]
        )
      );

      expect(hash1).toBe(hash2); // Same transaction
    });
  });
});