import { ethers, MaxUint256, formatUnits } from "ethers"

const maxUint256 = MaxUint256

export function newWallet() {
  return ethers.Wallet.createRandom()
}

export function bigNumberify(n: any) {
  return BigInt(n)
}

export function expandDecimals(n: any, decimals: number) {
  return BigInt(n) * (BigInt(10)**bigNumberify(decimals))
}

export async function send(provider: any, method: string, params: any[] = []) {
  await provider.send(method, params)
}

export async function mineBlock(provider: any) {
  await send(provider, "evm_mine")
}

export async function increaseTime(provider: any, seconds: number) {
  await send(provider, "evm_increaseTime", [seconds])
}

export async function gasUsed(provider: any, tx: any) {
  return (await provider.getTransactionReceipt(tx.hash)).gasUsed
}

export async function getNetworkFee(provider: any, tx: any) {
  const gas = await gasUsed(provider, tx)
  return gas.mul(tx.gasPrice)
}

export async function reportGasUsed(provider: any, tx: any, label: any) {
  const { gasUsed } = await provider.getTransactionReceipt(tx.hash)
  console.info(label, gasUsed.toString())
  return gasUsed
}

export async function getBlockTime(provider: any) {
  const blockNumber = await provider.getBlockNumber()
  const block = await provider.getBlock(blockNumber)
  return BigInt(block.timestamp)
}

export async function getTxnBalances(provider: any, user: any, txn: any, callback: any) {
    const balance0 = await provider.getBalance(user.address)
    const tx = await txn()
    const fee = await getNetworkFee(provider, tx)
    const balance1 = await provider.getBalance(user.address)
    callback(balance0, balance1, fee)
}

export function print(label: any, value: any, decimals: any) {
  if (decimals === 0) {
    console.log(label, value.toString())
    return
  }
  const valueStr = formatUnits(value, decimals)
  console.log(label, valueStr)
}

// export function getPriceBitArray(prices: number[]) {
//   let priceBitArray = []
//   let shouldExit = false

//   for (let i = 0; i < parseInt((prices.length - 1) / 8) + 1; i++) {
//     let priceBits = 0n
//     for (let j = 0; j < 8; j++) {
//       let index = i * 8 + j
//       if (index >= prices.length) {
//         shouldExit = true
//         break
//       }

//       const price = BigInt(prices[index])
//       if (price.gt(BigInt("2147483648"))) { // 2^31
//         throw new Error(`price exceeds bit limit ${price.toString()}`)
//       }
//       priceBits = priceBits.or(price.shln(j * 32))
//     }

//     priceBitArray.push(priceBits.toString())

//     if (shouldExit) { break }
//   }

//   return priceBitArray
// }

// export function getPriceBits(prices: any) {
//   if (prices.length > 8) {
//     throw new Error("max prices.length exceeded")
//   }

//   let priceBits = BigInt('0')

//   for (let j = 0; j < 8; j++) {
//     let index = j
//     if (index >= prices.length) {
//       break
//     }

//     const price = BigInt(prices[index])
//     if (price.gt(BigInt("2147483648"))) { // 2^31
//       throw new Error(`price exceeds bit limit ${price.toString()}`)
//     }

//     priceBits = priceBits.or(price.shln(j * 32))
//   }

//   return priceBits.toString()
// }

const limitDecimals = (amount: number, maxDecimals: number) => {
  let amountStr = amount.toString();
  if (maxDecimals === undefined) {
    return amountStr;
  }
  if (maxDecimals === 0) {
    return amountStr.split(".")[0];
  }
  const dotIndex = amountStr.indexOf(".");
  if (dotIndex !== -1) {
    let decimals = amountStr.length - dotIndex - 1;
    if (decimals > maxDecimals) {
      amountStr = amountStr.substr(0, amountStr.length - (decimals - maxDecimals));
    }
  }
  return amountStr;
}

const padDecimals = (amount: number, minDecimals: number) => {
  let amountStr = amount.toString();
  const dotIndex = amountStr.indexOf(".");
  if (dotIndex !== -1) {
    const decimals = amountStr.length - dotIndex - 1;
    if (decimals < minDecimals) {
      amountStr = amountStr.padEnd(amountStr.length + (minDecimals - decimals), "0");
    }
  } else {
    amountStr = amountStr + ".0000";
  }
  return amountStr;
}

// const parseValue = (value: number, tokenDecimals: number) => {
//   const pValue = parseFloat(value);
//   if (isNaN(pValue)) {
//     return undefined;
//   }
//   value = limitDecimals(value, tokenDecimals);
//   const amount = ethers.utils.parseUnits(value, tokenDecimals);
//   return bigNumberify(amount);
// }

export function numberWithCommas(x: any) {
  if (!x) {
    return "...";
  }
  var parts = x.toString().split(".");
  parts[0] = parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",");
  return parts.join(".");
}

// const formatAmount = (amount: number, tokenDecimals: number, displayDecimals: number, useCommas: any, defaultValue: any) => {
//   if (!defaultValue) {
//     defaultValue = "...";
//   }
//   if (amount === undefined || amount.toString().length === 0) {
//     return defaultValue;
//   }
//   if (displayDecimals === undefined) {
//     displayDecimals = 4;
//   }
//   let amountStr = formatUnits(amount, tokenDecimals);
//   amountStr = limitDecimals(amountStr, displayDecimals);
//   if (displayDecimals !== 0) {
//     amountStr = padDecimals(amountStr, displayDecimals);
//   }
//   if (useCommas) {
//     return numberWithCommas(amountStr);
//   }
//   return amountStr;
// };