import fs from 'node:fs';
import path from 'node:path';
import { type Connection, Keypair, LAMPORTS_PER_SOL, PublicKey } from '@solana/web3.js';

// define some default locations
const DEFAULT_KEY_DIR_NAME = '.local_keys';
const DEFAULT_PUBLIC_KEY_FILE = 'keys.json';
const DEFAULT_DEMO_DATA_FILE = 'demo.json';

/*
  Load locally stored PublicKey addresses
  TODO: use the helpers library and delete this function
*/
export function loadPublicKeysFromFile(absPath = `${DEFAULT_KEY_DIR_NAME}/${DEFAULT_PUBLIC_KEY_FILE}`) {
  try {
    if (!absPath) throw Error('No path provided');
    if (!fs.existsSync(absPath)) throw Error('File does not exist.');

    // load the public keys from the file
    const data = JSON.parse(fs.readFileSync(absPath, { encoding: 'utf-8' })) || {};

    // convert all loaded keyed values into valid public keys
    for (const [key, value] of Object.entries(data)) {
      data[key] = new PublicKey(value as string) ?? '';
    }

    return data;
  } catch (err) {
    console.warn('Unable to load local file');
  }
  // always return an object
  return {};
}

/*
  Locally save a demo data to the filesystem for later retrieval
*/
export function saveDemoDataToFile(name: string, newData: any, absPath = `${DEFAULT_KEY_DIR_NAME}/${DEFAULT_DEMO_DATA_FILE}`) {
  try {
    let data: object = {};

    // fetch all the current values, when the storage file exists
    if (fs.existsSync(absPath)) data = JSON.parse(fs.readFileSync(absPath, { encoding: 'utf-8' })) || {};

    data = { ...data, [name]: newData };

    // actually save the data to the file
    fs.writeFileSync(absPath, JSON.stringify(data), {
      encoding: 'utf-8',
    });

    return data;
  } catch (err) {
    console.warn('Unable to save to file');
    console.warn(err);
  }

  // always return an object
  return {};
}

/*
  Locally save a PublicKey addresses to the filesystem for later retrieval
*/
export function savePublicKeyToFile(name: string, publicKey: PublicKey, absPath = `${DEFAULT_KEY_DIR_NAME}/${DEFAULT_PUBLIC_KEY_FILE}`) {
  try {
    // if (!absPath) throw Error("No path provided");
    // if (!fs.existsSync(absPath)) throw Error("File does not exist.");

    // fetch all the current values
    let data: any = loadPublicKeysFromFile(absPath);

    // convert all loaded keyed values from PublicKeys to strings
    for (const [key, value] of Object.entries(data)) {
      data[key as any] = (value as PublicKey).toBase58();
    }
    data = { ...data, [name]: publicKey.toBase58() };

    // actually save the data to the file
    fs.writeFileSync(absPath, JSON.stringify(data), {
      encoding: 'utf-8',
    });

    // reload the keys for sanity
    data = loadPublicKeysFromFile(absPath);

    return data;
  } catch (err) {
    console.warn('Unable to save to file');
  }
  // always return an object
  return {};
}

/*
  Load a locally stored JSON keypair file and convert it to a valid Keypair
*/
export function loadKeypairFromFile(absPath: string) {
  try {
    if (!absPath) throw Error('No path provided');
    if (!fs.existsSync(absPath)) throw Error('File does not exist.');

    // load the keypair from the file
    const keyfileBytes = JSON.parse(fs.readFileSync(absPath, { encoding: 'utf-8' }));
    // parse the loaded secretKey into a valid keypair
    const keypair = Keypair.fromSecretKey(new Uint8Array(keyfileBytes));
    return keypair;
  } catch (err) {
    console.error('loadKeypairFromFile:', err);
    throw err;
  }
}

/*
  Save a locally stored JSON keypair file for later importing
  TODO: delete this function and use the helpers library
*/
export function saveKeypairToFile(keypair: Keypair, relativeFileName: string, dirName: string = DEFAULT_KEY_DIR_NAME) {
  const fileName = path.join(dirName, `${relativeFileName}.json`);

  // create the `dirName` directory, if it does not exists
  if (!fs.existsSync(`./${dirName}/`)) fs.mkdirSync(`./${dirName}/`);

  // remove the current file, if it already exists
  if (fs.existsSync(fileName)) fs.unlinkSync(fileName);

  // write the `secretKey` value as a string
  fs.writeFileSync(fileName, `[${keypair.secretKey.toString()}]`, {
    encoding: 'utf-8',
  });

  return fileName;
}

/*
  Attempt to load a keypair from the filesystem, or generate and save a new one
*/
export function loadOrGenerateKeypair(fileName: string, dirName: string = DEFAULT_KEY_DIR_NAME) {
  try {
    // compute the path to locate the file
    const searchPath = path.join(dirName, `${fileName}.json`);
    let keypair = Keypair.generate();

    // attempt to load the keypair from the file
    if (fs.existsSync(searchPath)) keypair = loadKeypairFromFile(searchPath);
    // when unable to locate the keypair, save the new one
    else saveKeypairToFile(keypair, fileName, dirName);

    return keypair;
  } catch (err) {
    console.error('loadOrGenerateKeypair:', err);
    throw err;
  }
}

/*
  Compute the Solana explorer address for the various data
*/
export function explorerURL({
  address,
  txSignature,
  cluster,
}: {
  address?: string;
  txSignature?: string;
  cluster?: 'devnet' | 'testnet' | 'mainnet' | 'mainnet-beta';
}) {
  let baseUrl: string;
  //
  if (address) baseUrl = `https://explorer.solana.com/address/${address}`;
  else if (txSignature) baseUrl = `https://explorer.solana.com/tx/${txSignature}`;
  else return '[unknown]';

  // auto append the desired search params
  const url = new URL(baseUrl);
  url.searchParams.append('cluster', cluster || 'devnet');
  return `${url.toString()}\n`;
}

/**
 * Auto airdrop the given wallet of of a balance of < 0.5 SOL
 */
export async function airdropOnLowBalance(connection: Connection, keypair: Keypair, forceAirdrop = false) {
  // get the current balance
  const balance = await connection.getBalance(keypair.publicKey);

  // define the low balance threshold before airdrop
  const MIN_BALANCE_TO_AIRDROP = LAMPORTS_PER_SOL / 2; // current: 0.5 SOL

  // check the balance of the two accounts, airdrop when low
  if (forceAirdrop === true || balance < MIN_BALANCE_TO_AIRDROP) {
    console.log(`Requesting airdrop of 1 SOL to ${keypair.publicKey.toBase58()}...`);
    await connection.requestAirdrop(keypair.publicKey, LAMPORTS_PER_SOL).then((sig) => {
      console.log('Tx signature:', sig);
      // balance = balance + LAMPORTS_PER_SOL;
    });

    // fetch the new balance
    // const newBalance = await connection.getBalance(keypair.publicKey);
    // return newBalance;
  }
  // else console.log("Balance of:", balance / LAMPORTS_PER_SOL, "SOL");

  return balance;
}

/*
  Helper function to extract a transaction signature from a failed transaction's error message
*/
export async function extractSignatureFromFailedTransaction(connection: Connection, err: any, fetchLogs?: boolean) {
  if (err?.signature) return err.signature;

  // extract the failed transaction's signature
  const failedSig = new RegExp(/^((.*)?Error: )?(Transaction|Signature) ([A-Z0-9]{32,}) /gim).exec(err?.message?.toString())?.[4];

  // ensure a signature was found
  if (failedSig) {
    // when desired, attempt to fetch the program logs from the cluster
    if (fetchLogs)
      await connection
        .getTransaction(failedSig, {
          maxSupportedTransactionVersion: 0,
        })
        .then((tx) => {
          console.log(`\n==== Transaction logs for ${failedSig} ====`);
          console.log(explorerURL({ txSignature: failedSig }), '');
          console.log(tx?.meta?.logMessages ?? 'No log messages provided by RPC');
          console.log('==== END LOGS ====\n');
        });
    else {
      console.log('\n========================================');
      console.log(explorerURL({ txSignature: failedSig }));
      console.log('========================================\n');
    }
  }

  // always return the failed signature value
  return failedSig;
}

/*
  Standard number formatter
*/
export function numberFormatter(num: number, forceDecimals = false) {
  // set the significant figures
  const minimumFractionDigits = num < 1 || forceDecimals ? 10 : 2;

  // do the formatting
  return new Intl.NumberFormat(undefined, {
    minimumFractionDigits,
  }).format(num);
}

/*
  Display a separator in the console, with our without a message
*/
export function printConsoleSeparator(message?: string) {
  console.log('\n===============================================');
  console.log('===============================================\n');
  if (message) console.log(message);
}