import { readFileSync } from "node:fs";
import path from "node:path";
import { $ } from "bun";
import { CHAIN_CONFIGS, loadChainConfig } from "configs/contracts/config";
import invariant from "tiny-invariant";
import { logger, parseDeploymentsFile, runShellCommandWithLogger } from "utils";
import type { ParameterCollection } from "utils/parameters";
import { encodeFunctionData } from "viem";
import { privateKeyToAccount } from "viem/accounts";
import { dataHavenServiceManagerAbi } from "../contract-bindings/generated";

interface ContractDeploymentOptions {
  chain?: string;
  environment?: string;
  rpcUrl?: string;
  privateKey?: string | undefined;
  verified?: boolean;
  blockscoutBackendUrl?: string;
  avsOwnerAddress?: string;
  avsOwnerKey?: string;
  txExecution?: boolean;
}

/**
 * Builds the network identifier from chain and optional environment
 * When environment is specified: {environment}-{chain} (e.g., "stagenet-hoodi")
 * When environment is not specified: {chain} (e.g., "hoodi")
 */
export const buildNetworkId = (chain: string, environment?: string): string => {
  return environment ? `${environment}-${chain}` : chain;
};

/**
 * Validates deployment parameters
 */
export const validateDeploymentParams = (options: ContractDeploymentOptions) => {
  const { rpcUrl, verified, blockscoutBackendUrl } = options;

  invariant(rpcUrl, "❌ RPC URL is required");
  if (verified) {
    invariant(blockscoutBackendUrl, "❌ Blockscout backend URL is required for verification");
  }
};

/**
 * Builds smart contracts using forge
 */
export const buildContracts = async () => {
  logger.info("🛳️ Building contracts...");
  const {
    exitCode: buildExitCode,
    stderr: buildStderr,
    stdout: buildStdout
  } = await $`forge build`.cwd("../contracts").nothrow().quiet();

  if (buildExitCode !== 0) {
    logger.error(buildStderr.toString());
    throw Error("❌ Contracts have failed to build properly.");
  }
  logger.debug(buildStdout.toString());
};

/**
 * Constructs the deployment command
 */
export const constructDeployCommand = (options: ContractDeploymentOptions): string => {
  const { chain, environment, rpcUrl, verified, blockscoutBackendUrl } = options;

  const deploymentScript =
    !chain || chain === "anvil"
      ? "script/deploy/DeployLocal.s.sol"
      : "script/deploy/DeployLive.s.sol";

  // Build the network identifier for display and environment variable
  const networkId = buildNetworkId(chain || "anvil", environment);

  logger.info(`🚀 Deploying contracts to ${networkId} using ${deploymentScript}`);

  let deployCommand = `forge script ${deploymentScript} --rpc-url ${rpcUrl} --color never -vv --no-rpc-rate-limit --non-interactive --broadcast`;

  // Add environment variables for network (used by Solidity scripts for config/output file naming)
  if (chain) {
    deployCommand = `NETWORK=${networkId} ${deployCommand}`;
  }

  if (verified && blockscoutBackendUrl) {
    // TODO: Allow for other verifiers like Etherscan.
    deployCommand += ` --verify --verifier blockscout --verifier-url ${blockscoutBackendUrl}/api/ --delay 0`;
    logger.info("🔍 Contract verification enabled");
  }

  return deployCommand;
};

/**
 * Executes contract deployment
 * Supports multiple calling patterns for backwards compatibility:
 */
export const executeDeployment = async (
  deployCommand: string,
  parameterCollection?: ParameterCollection,
  chain?: string,
  env?: Record<string, string>
) => {
  logger.info("⌛️ Deploying contracts (this might take a few minutes)...");

  // Using custom shell command to improve logging with forge's stdoutput
  await runShellCommandWithLogger(deployCommand, {
    cwd: "../contracts",
    env
  });

  // After deployment, read the Gateway address and add it to parameters if collection is provided
  if (parameterCollection) {
    await updateParameters(parameterCollection, chain);
  }

  logger.success("Contracts deployed successfully");
};

/**
 * Gets the current code version from contracts/VERSION file
 * This is the single source of truth for the code version
 */
export const getCurrentVersion = async (): Promise<string> => {
  const cwd = process.cwd();
  const repoRoot = path.basename(cwd) === "test" ? path.join(cwd, "..") : cwd;
  const versionFile = path.join(repoRoot, "contracts", "VERSION");

  try {
    const version = readFileSync(versionFile, "utf8").trim();
    if (!version) {
      throw new Error("VERSION file is empty");
    }
    return version;
  } catch (error) {
    throw new Error(`Failed to read contracts/VERSION: ${error}`);
  }
};

/**
 * Read the parameters from the deployed contracts and add it to the collection.
 */
export const updateParameters = async (
  parameterCollection: ParameterCollection,
  chain?: string
) => {
  const deployments = await parseDeploymentsFile(chain);
  const gatewayAddress = deployments.Gateway;
  const serviceManagerAddress = deployments.ServiceManager;

  if (gatewayAddress) {
    logger.debug(`📝 Adding EthereumGatewayAddress parameter: ${gatewayAddress}`);

    parameterCollection.addParameter({
      name: "EthereumGatewayAddress",
      value: gatewayAddress
    });
  } else {
    logger.warn("⚠️ Gateway address not found in deployments file");
  }

  if (serviceManagerAddress) {
    logger.debug(`📝 Adding DatahavenServiceManagerAddress parameter: ${serviceManagerAddress}`);
    parameterCollection.addParameter({
      name: "DatahavenServiceManagerAddress",
      value: serviceManagerAddress
    });
  } else {
    logger.warn("⚠️ ServiceManager address not found in deployments file");
  }
};

/**
 * Main function to deploy contracts with simplified interface
 * This is the main entry point for CLI handlers
 */
export const deployContracts = async (options: {
  chain: string;
  environment?: string;
  rpcUrl?: string;
  privateKey?: string | undefined;
  verified?: boolean;
  blockscoutBackendUrl?: string;
  avsOwnerKey?: string;
  avsOwnerAddress?: string;
  txExecution?: boolean;
}) => {
  const chainConfig = CHAIN_CONFIGS[options.chain as keyof typeof CHAIN_CONFIGS];

  if (!chainConfig) {
    throw new Error(`Unsupported chain: ${options.chain}`);
  }

  // Build network identifier for config/deployment file naming
  const networkId = buildNetworkId(options.chain, options.environment);

  const finalRpcUrl = options.rpcUrl || chainConfig.RPC_URL;
  const isLocalChain = options.chain === "anvil";
  const txExecutionEnabled = options.txExecution ?? isLocalChain;
  const normalizedOwnerKey = normalizePrivateKey(
    options.avsOwnerKey || process.env.AVS_OWNER_PRIVATE_KEY
  );

  let resolvedAvsOwnerAddress = options.avsOwnerAddress;
  if (!resolvedAvsOwnerAddress && normalizedOwnerKey) {
    resolvedAvsOwnerAddress = privateKeyToAccount(normalizedOwnerKey).address;
  }

  if (!resolvedAvsOwnerAddress && isLocalChain) {
    const config = await loadChainConfig(options.chain, options.environment);
    resolvedAvsOwnerAddress = config?.avs?.avsOwner;
  }

  if (!resolvedAvsOwnerAddress) {
    throw new Error(
      "AVS owner address is required. Provide --avs-owner-address, --avs-owner-key, or AVS_OWNER_ADDRESS."
    );
  }

  if (txExecutionEnabled && !normalizedOwnerKey) {
    throw new Error(
      "Executing AVS owner transactions requires --avs-owner-key or AVS_OWNER_PRIVATE_KEY to be set."
    );
  }

  const deploymentOptions: ContractDeploymentOptions = {
    chain: options.chain,
    environment: options.environment,
    rpcUrl: finalRpcUrl,
    privateKey: options.privateKey,
    verified: options.verified,
    blockscoutBackendUrl: options.blockscoutBackendUrl,
    avsOwnerAddress: resolvedAvsOwnerAddress,
    avsOwnerKey: normalizedOwnerKey,
    txExecution: txExecutionEnabled
  };

  // Validate parameters
  validateDeploymentParams(deploymentOptions);

  // Build contracts
  await buildContracts();

  // Construct and execute deployment
  const deployCommand = constructDeployCommand(deploymentOptions);
  const env = buildDeploymentEnv(deploymentOptions);
  await executeDeployment(deployCommand, undefined, networkId, env);

  if (!txExecutionEnabled) {
    await emitOwnerTransactionCalldata(networkId);
  }

  logger.success(`DataHaven contracts deployed successfully to ${networkId}`);
};

const normalizePrivateKey = (key?: string): `0x${string}` | undefined => {
  if (!key) {
    return undefined;
  }
  return (key.startsWith("0x") ? key : `0x${key}`) as `0x${string}`;
};

const buildDeploymentEnv = (options: ContractDeploymentOptions) => {
  const env: Record<string, string> = {};

  if (options.privateKey) {
    env.DEPLOYER_PRIVATE_KEY = options.privateKey;
  }

  if (options.avsOwnerKey) {
    env.AVS_OWNER_PRIVATE_KEY = options.avsOwnerKey;
  }

  if (options.avsOwnerAddress) {
    env.AVS_OWNER_ADDRESS = options.avsOwnerAddress;
  }

  if (typeof options.txExecution === "boolean") {
    env.TX_EXECUTION = options.txExecution ? "true" : "false";
  }

  return env;
};

const emitOwnerTransactionCalldata = async (chain?: string) => {
  try {
    const deployments = await parseDeploymentsFile(chain);

    const serviceManager = deployments.ServiceManager;

    if (!serviceManager) {
      logger.warn("⚠️ Missing ServiceManager address; cannot produce multisig calldata.");
      return;
    }

    const calls = [
      {
        label: "Set metadata URI",
        description: 'DataHavenServiceManager.updateAVSMetadataURI("")',
        to: serviceManager,
        value: "0",
        data: encodeFunctionData({
          abi: dataHavenServiceManagerAbi,
          functionName: "updateAVSMetadataURI",
          args: [""]
        })
      }
    ];

    logger.info(
      "🔐 On-chain owner transactions were deferred. Submit the following calls via your multisig:"
    );
    calls.forEach((call, index) => {
      logger.info(`\n#${index + 1} ${call.label}`);
      logger.info(call.description);
      logger.info(JSON.stringify(call, null, 2));
    });
  } catch (error) {
    logger.warn(`⚠️ Failed to build multisig calldata: ${error}`);
  }
};

// Allow script to be run directly with CLI arguments
if (import.meta.main) {
  const args = process.argv.slice(2);

  // Extract RPC URL
  const rpcUrlIndex = args.indexOf("--rpc-url");
  invariant(rpcUrlIndex !== -1, "❌ --rpc-url flag is required");
  invariant(rpcUrlIndex + 1 < args.length, "❌ --rpc-url flag requires an argument");

  // Extract private key
  const privateKeyIndex = args.indexOf("--private-key");
  invariant(privateKeyIndex !== -1, "❌ --private-key flag is required");
  invariant(privateKeyIndex + 1 < args.length, "❌ --private-key flag requires an argument");

  const options: {
    rpcUrl: string;
    privateKey: string;
    verified: boolean;
    blockscoutBackendUrl?: string;
  } = {
    rpcUrl: args[rpcUrlIndex + 1],
    privateKey: args[privateKeyIndex + 1],
    verified: args.includes("--verified")
  };

  // Extract Blockscout URL if verification is enabled
  if (options.verified) {
    const blockscoutUrlIndex = args.indexOf("--blockscout-url");
    if (blockscoutUrlIndex !== -1 && blockscoutUrlIndex + 1 < args.length) {
      options.blockscoutBackendUrl = args[blockscoutUrlIndex + 1];
    }
  }

  if (!options.rpcUrl) {
    console.error("Error: --rpc-url parameter is required");
    process.exit(1);
  }

  if (options.verified && !options.blockscoutBackendUrl) {
    console.error("Error: --blockscout-url parameter is required when using --verified");
    process.exit(1);
  }

  validateDeploymentParams(options);

  await buildContracts();

  const deployCommand = constructDeployCommand(options);
  const directEnv = options.privateKey ? { DEPLOYER_PRIVATE_KEY: options.privateKey } : undefined;
  await executeDeployment(deployCommand, undefined, undefined, directEnv);
}