import { HardhatRuntimeEnvironment } from "hardhat/types/hre";
import type {
  ForkEnvironment,
  NetworkManager,
  DeployedContract,
  ContractInteraction,
  InteractionResult,
} from "./types.js";

/**
 * Manages blockchain forking and network state manipulation for dynamic analysis
 */
export class ForkManager implements NetworkManager {
  private hre: HardhatRuntimeEnvironment;
  private currentFork?: ForkEnvironment;

  constructor(hre: HardhatRuntimeEnvironment) {
    this.hre = hre;
  }

  /**
   * Fork Ethereum mainnet at a specific block
   */
  async forkMainnet(blockNumber?: number): Promise<ForkEnvironment> {
    try {
      // Reset any existing fork
      await this.resetFork();

      const mainnetRpcUrl =
        process.env.MAINNET_RPC_URL ||
        "https://eth-mainnet.alchemyapi.io/v2/your-api-key";

      // Configure Hardhat Network to fork mainnet (simplified for demo)
      // In a full implementation, this would properly configure the network
      console.log(`🔗 [DEMO] Would fork mainnet with RPC: ${mainnetRpcUrl}`);

      // Mock available accounts for demo
      const accounts = [
        "0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266", // Default Hardhat account
        "0x70997970C51812dc3A010C7d01b50e0d17dc79C8", // Second account
      ];

      this.currentFork = {
        network: "mainnet",
        blockNumber,
        rpcUrl: mainnetRpcUrl,
        accounts,
        provider: null, // Simplified for demo
      };

      console.log(
        `🔗 Forked mainnet ${blockNumber ? `at block ${blockNumber}` : "at latest"}`,
      );
      return this.currentFork;
    } catch (error) {
      throw new Error(`Failed to fork mainnet: ${error}`);
    }
  }

  /**
   * Fork a testnet at a specific block
   */
  async forkTestnet(
    network: string,
    blockNumber?: number,
  ): Promise<ForkEnvironment> {
    const testnetUrls: Record<string, string> = {
      goerli:
        process.env.GOERLI_RPC_URL ||
        "https://eth-goerli.alchemyapi.io/v2/your-api-key",
      sepolia:
        process.env.SEPOLIA_RPC_URL ||
        "https://eth-sepolia.alchemyapi.io/v2/your-api-key",
    };

    const rpcUrl = testnetUrls[network];
    if (!rpcUrl) {
      throw new Error(`Unsupported testnet: ${network}`);
    }

    try {
      await this.resetFork();

      // Demo implementation - would use actual Hardhat network provider
      console.log(`🔗 [DEMO] Would fork ${network} with RPC: ${rpcUrl}`);

      const accounts = [
        "0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266",
        "0x70997970C51812dc3A010C7d01b50e0d17dc79C8",
      ];

      this.currentFork = {
        network,
        blockNumber,
        rpcUrl,
        accounts,
        provider: null, // Simplified for demo
      };

      console.log(
        `🔗 Forked ${network} ${blockNumber ? `at block ${blockNumber}` : "at latest"}`,
      );
      return this.currentFork;
    } catch (error) {
      throw new Error(`Failed to fork ${network}: ${error}`);
    }
  }

  /**
   * Reset the fork to clean state
   */
  async resetFork(): Promise<void> {
    try {
      // Demo implementation
      this.currentFork = undefined;
      console.log("🔄 [DEMO] Reset blockchain fork");
    } catch (error) {
      console.warn(`Warning: Could not reset fork: ${error}`);
    }
  }

  /**
   * Set the balance of an account
   */
  async setBalance(address: string, balance: string): Promise<void> {
    try {
      // Demo implementation
      console.log(`💰 [DEMO] Would set balance of ${address} to ${balance}`);
    } catch (error) {
      throw new Error(`Failed to set balance: ${error}`);
    }
  }

  /**
   * Set storage slot value
   */
  async setStorageAt(
    address: string,
    slot: string,
    value: string,
  ): Promise<void> {
    try {
      // Demo implementation
      console.log(
        `🗃️ [DEMO] Would set storage at ${address}[${slot}] = ${value}`,
      );
    } catch (error) {
      throw new Error(`Failed to set storage: ${error}`);
    }
  }

  /**
   * Mine blocks
   */
  async mine(blocks: number = 1): Promise<void> {
    try {
      // Demo implementation
      console.log(`⛏️ [DEMO] Would mine ${blocks} block(s)`);
    } catch (error) {
      throw new Error(`Failed to mine blocks: ${error}`);
    }
  }

  /**
   * Set next block timestamp
   */
  async setNextBlockTimestamp(timestamp: number): Promise<void> {
    try {
      // Demo implementation
      console.log(`⏰ [DEMO] Would set next block timestamp to ${timestamp}`);
    } catch (error) {
      throw new Error(`Failed to set timestamp: ${error}`);
    }
  }

  /**
   * Deploy a contract for testing
   */
  async deployContract(
    contractName: string,
    constructorArgs: any[] = [],
    deployer?: string,
  ): Promise<DeployedContract> {
    try {
      // Demo implementation - would compile and deploy actual contract
      const mockAddress = `0x${Math.floor(Math.random() * 1000000)
        .toString(16)
        .padStart(40, "0")}`;

      const deployed: DeployedContract = {
        name: contractName,
        address: mockAddress,
        abi: [],
        bytecode: "0x",
        deployer: deployer || "0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266",
        constructorArgs,
      };

      console.log(`📄 [DEMO] Would deploy ${contractName} at ${mockAddress}`);
      return deployed;
    } catch (error) {
      throw new Error(`Failed to deploy ${contractName}: ${error}`);
    }
  }

  /**
   * Execute contract interaction
   */
  async executeInteraction(
    interaction: ContractInteraction,
  ): Promise<InteractionResult> {
    try {
      // Demo implementation - would execute actual contract call
      const success = Math.random() > 0.1; // 90% success rate
      const gasUsed = Math.floor(Math.random() * 100000) + 21000;

      console.log(
        `📞 [DEMO] Would call ${interaction.contract.name}.${interaction.method}(${interaction.params.join(", ")})`,
      );

      return {
        success,
        returnValue: success ? "0x1" : undefined,
        gasUsed,
        events: [],
        trace: undefined,
      };
    } catch (error) {
      return {
        success: false,
        gasUsed: 0,
        events: [],
        error: error instanceof Error ? error.message : String(error),
      };
    }
  }

  /**
   * Get current fork environment
   */
  getCurrentFork(): ForkEnvironment | undefined {
    return this.currentFork;
  }

  /**
   * Convert string amount to hex (for RPC calls)
   */
  private toHex(value: string): string {
    if (value.includes("ether")) {
      const ethAmount = value.replace("ether", "").trim();
      return `0x${(BigInt(ethAmount) * BigInt("1000000000000000000")).toString(16)}`;
    }
    return `0x${BigInt(value).toString(16)}`;
  }

  /**
   * Simulate economic shock (price manipulation)
   */
  async simulatePriceShock(
    oracleAddress: string,
    newPrice: string,
    priceSlot?: string,
  ): Promise<void> {
    try {
      // Demo implementation
      if (priceSlot) {
        await this.setStorageAt(
          oracleAddress,
          priceSlot,
          `0x${BigInt(newPrice).toString(16)}`,
        );
        console.log(
          `📈 [DEMO] Would manipulate oracle price at ${oracleAddress} to ${newPrice}`,
        );
      } else {
        console.warn(
          `⚠️ Cannot manipulate oracle without storage slot information`,
        );
      }
    } catch (error) {
      throw new Error(`Failed to simulate price shock: ${error}`);
    }
  }

  /**
   * Simulate network congestion (high gas prices, slow transactions)
   */
  async simulateNetworkCongestion(
    baseFee: string,
    maxPriorityFee: string,
  ): Promise<void> {
    try {
      // Demo implementation
      console.log(
        `⛽ [DEMO] Would simulate network congestion: baseFee=${baseFee}, priority=${maxPriorityFee}`,
      );
    } catch (error) {
      throw new Error(`Failed to simulate congestion: ${error}`);
    }
  }

  /**
   * Advance time on the blockchain
   */
  async advanceTime(seconds: number): Promise<void> {
    try {
      // Demo implementation
      await this.mine(1); // Mine a block to update timestamp
      console.log(`⏭️ [DEMO] Would advance time by ${seconds} seconds`);
    } catch (error) {
      throw new Error(`Failed to advance time: ${error}`);
    }
  }

  /**
   * Snapshot current state
   */
  async snapshot(): Promise<string> {
    try {
      // Demo implementation
      const snapshotId = `snapshot_${Date.now()}`;
      console.log(`📸 [DEMO] Would create snapshot: ${snapshotId}`);
      return snapshotId;
    } catch (error) {
      throw new Error(`Failed to create snapshot: ${error}`);
    }
  }

  /**
   * Restore from snapshot
   */
  async revert(snapshotId: string): Promise<void> {
    try {
      // Demo implementation
      console.log(`↩️ [DEMO] Would revert to snapshot: ${snapshotId}`);
    } catch (error) {
      throw new Error(`Failed to revert snapshot: ${error}`);
    }
  }
}