// import BN from 'bn.js';

// import { Spl, SPL_ACCOUNT_LAYOUT } from '../spl';
// import { TOKEN_PROGRAM_ID } from './id';

import {
  AccountInfo,
  AddressLookupTableAccount,
  Commitment,
  Connection,
  Keypair,
  PublicKey,
  SimulatedTransactionResponse,
  Transaction,
  TransactionInstruction,
  TransactionMessage,
} from '@solana/web3.js'

import {
  ComputeBudgetConfig,
  InnerSimpleLegacyTransaction,
  InnerSimpleV0Transaction,
  InnerTransaction,
  TxVersion,
} from '../base'
import { addComputeBudget } from '../base/instrument'

import { chunkArray } from './lodash'
import { Logger } from './logger'

const logger = Logger.from('common/web3')

interface MultipleAccountsJsonRpcResponse {
  jsonrpc: string
  id: string
  error?: {
    code: number
    message: string
  }
  result: {
    context: { slot: number }
    value: { data: Array<string>; executable: boolean; lamports: number; owner: string; rentEpoch: number }[]
  }
}

export interface GetMultipleAccountsInfoConfig {
  batchRequest?: boolean
  commitment?: Commitment
}

// export async function batchGetMultipleAccountsInfo() {}

export async function getMultipleAccountsInfo(
  connection: Connection,
  publicKeys: PublicKey[],
  config?: GetMultipleAccountsInfoConfig,
): Promise<(AccountInfo<Buffer> | null)[]> {
  const { batchRequest, commitment } = {
    // default
    ...{
      batchRequest: false,
    },
    // custom
    ...config,
  }

  const chunkedKeys = chunkArray(publicKeys, 100)
  let results: (AccountInfo<Buffer> | null)[][] = new Array(chunkedKeys.length).fill([])

  if (batchRequest) {
    const batch = chunkedKeys.map((keys) => {
      const args = connection._buildArgs([keys.map((key) => key.toBase58())], commitment, 'base64')
      return {
        methodName: 'getMultipleAccounts',
        args,
      }
    })
    const _batch = chunkArray(batch, 10)

    const unsafeResponse: MultipleAccountsJsonRpcResponse[] = await (
      await Promise.all(
        _batch.map(
          async (i) =>
            // eslint-disable-next-line @typescript-eslint/ban-ts-comment
            // @ts-ignore
            await connection._rpcBatchRequest(i),
        ),
      )
    ).flat()
    results = unsafeResponse.map((unsafeRes: MultipleAccountsJsonRpcResponse) => {
      if (unsafeRes.error) {
        return logger.throwError('failed to get info for multiple accounts', Logger.errors.RPC_ERROR, {
          message: unsafeRes.error.message,
        })
      }

      return unsafeRes.result.value.map((accountInfo) => {
        if (accountInfo) {
          const { data, executable, lamports, owner, rentEpoch } = accountInfo

          if (data.length !== 2 && data[1] !== 'base64') {
            return logger.throwError('info must be base64 encoded', Logger.errors.RPC_ERROR)
          }

          return {
            data: Buffer.from(data[0], 'base64'),
            executable,
            lamports,
            owner: new PublicKey(owner),
            rentEpoch,
          }
        } else {
          return null
        }
      })
    })
  } else {
    try {
      results = (await Promise.all(
        chunkedKeys.map((keys) => connection.getMultipleAccountsInfo(keys, commitment)),
      )) as (AccountInfo<Buffer> | null)[][]
    } catch (error) {
      if (error instanceof Error) {
        return logger.throwError('failed to get info for multiple accounts', Logger.errors.RPC_ERROR, {
          message: error.message,
        })
      }
    }
  }

  return results.flat()
}

export async function getMultipleAccountsInfoWithCustomFlags<T extends { pubkey: PublicKey }>(
  connection: Connection,
  publicKeysWithCustomFlag: T[],
  config?: GetMultipleAccountsInfoConfig,
): Promise<({ accountInfo: AccountInfo<Buffer> | null } & T)[]> {
  const multipleAccountsInfo = await getMultipleAccountsInfo(
    connection,
    publicKeysWithCustomFlag.map((o) => o.pubkey),
    config,
  )

  return publicKeysWithCustomFlag.map((o, idx) => ({ ...o, accountInfo: multipleAccountsInfo[idx] }))
}

export interface GetTokenAccountsByOwnerConfig {
  commitment?: Commitment
}

// export async function getTokenAccountsByOwner(
//   connection: Connection,
//   owner: PublicKey,
//   config?: GetTokenAccountsByOwnerConfig
// ) {
//   const defaultConfig = {};
//   const customConfig = { ...defaultConfig, ...config };

//   const solReq = connection.getAccountInfo(owner, customConfig.commitment);
//   const tokenReq = connection.getTokenAccountsByOwner(
//     owner,
//     {
//       programId: TOKEN_PROGRAM_ID
//     },
//     customConfig.commitment
//   );

//   const [solResp, tokenResp] = await Promise.all([solReq, tokenReq]);

//   const accounts: {
//     publicKey?: PublicKey;
//     mint?: PublicKey;
//     isAssociated?: boolean;
//     amount: BN;
//     isNative: boolean;
//   }[] = [];

//   for (const { pubkey, account } of tokenResp.value) {
//     // double check layout length
//     if (account.data.length !== SPL_ACCOUNT_LAYOUT.span) {
//       return logger.throwArgumentError('invalid token account layout length', 'publicKey', pubkey);
//     }

//     const { mint, amount } = SPL_ACCOUNT_LAYOUT.decode(account.data);
//     const associatedTokenAddress = await Spl.getAssociatedTokenAddress({ mint, owner });

//     accounts.push({
//       publicKey: pubkey,
//       mint,
//       isAssociated: associatedTokenAddress.equals(pubkey),
//       amount,
//       isNative: false
//     });
//   }

//   if (solResp) {
//     accounts.push({
//       amount: new BN(solResp.lamports),
//       isNative: true
//     });
//   }

//   return accounts;
// }

/**
 * Forecast transaction size
 */
export function forecastTransactionSize(instructions: TransactionInstruction[], signers: PublicKey[]) {
  if (instructions.length < 1) {
    return logger.throwArgumentError('no instructions provided', 'instructions', instructions)
  }
  if (signers.length < 1) {
    return logger.throwArgumentError('no signers provided', 'signers', signers)
  }

  const transaction = new Transaction({
    recentBlockhash: '11111111111111111111111111111111',
    feePayer: signers[0],
  })

  transaction.add(...instructions)

  try {
    return Buffer.from(transaction.serialize({ verifySignatures: false })).toString('base64').length < MAX_BASE64_SIZE
  } catch (error) {
    return false
  }
}

/**
 * Simulates multiple instruction
 */
export async function simulateMultipleInstruction(
  connection: Connection,
  instructions: TransactionInstruction[],
  keyword: string,
  batchRequest = true,
) {
  const feePayer = new PublicKey('RaydiumSimuLateTransaction11111111111111111')

  const transactions: Transaction[] = []

  let transaction = new Transaction()
  transaction.feePayer = feePayer

  for (const instruction of instructions) {
    if (!forecastTransactionSize([...transaction.instructions, instruction], [feePayer])) {
      transactions.push(transaction)
      transaction = new Transaction()
      transaction.feePayer = feePayer
    }
    transaction.add(instruction)
  }
  if (transaction.instructions.length > 0) {
    transactions.push(transaction)
  }

  let results: SimulatedTransactionResponse[] = []

  try {
    results = await simulateTransaction(connection, transactions, batchRequest)
    if (results.find((i) => i.err !== null)) throw Error('rpc simulateTransaction error')
  } catch (error) {
    if (error instanceof Error) {
      return logger.throwError('failed to simulate for instructions', Logger.errors.RPC_ERROR, {
        message: error.message,
      })
    }
  }

  const logs: string[] = []
  for (const result of results) {
    logger.debug('simulate result:', result)

    if (result.logs) {
      const filteredLog = result.logs.filter((log) => log && log.includes(keyword))
      logger.debug('filteredLog:', logs)

      logger.assertArgument(filteredLog.length !== 0, 'simulate log not match keyword', 'keyword', keyword)

      logs.push(...filteredLog)
    }
  }

  return logs
}

export function parseSimulateLogToJson(log: string, keyword: string) {
  const results = log.match(/{["\w:,]+}/g)
  if (!results || results.length !== 1) {
    return logger.throwArgumentError('simulate log fail to match json', 'keyword', keyword)
  }

  return results[0]
}

export function parseSimulateValue(log: string, key: string) {
  const reg = new RegExp(`"${key}":(\\d+)`, 'g')

  const results = reg.exec(log)
  if (!results || results.length !== 2) {
    return logger.throwArgumentError('simulate log fail to match key', 'key', key)
  }

  return results[1]
}

export async function simulateTransaction(connection: Connection, transactions: Transaction[], batchRequest?: boolean) {
  let results: any[] = []
  if (batchRequest) {
    const getLatestBlockhash = await connection.getLatestBlockhash()

    const encodedTransactions: string[] = []
    for (const transaction of transactions) {
      transaction.recentBlockhash = getLatestBlockhash.blockhash
      transaction.lastValidBlockHeight = getLatestBlockhash.lastValidBlockHeight

      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
      // @ts-ignore
      const message = transaction._compile()
      const signData = message.serialize()

      // eslint-disable-next-line @typescript-eslint/ban-ts-comment
      // @ts-ignore
      const wireTransaction = transaction._serialize(signData)
      const encodedTransaction = wireTransaction.toString('base64')

      encodedTransactions.push(encodedTransaction)
    }

    const batch = encodedTransactions.map((keys) => {
      const args = connection._buildArgs([keys], undefined, 'base64')
      return {
        methodName: 'simulateTransaction',
        args,
      }
    })

    const reqData: { methodName: string; args: any[] }[][] = []
    const itemReqIndex = 20
    for (let i = 0; i < Math.ceil(batch.length / itemReqIndex); i++) {
      reqData.push(batch.slice(i * itemReqIndex, (i + 1) * itemReqIndex))
    }

    results = await (
      await Promise.all(
        reqData.map(async (i) => {
          // eslint-disable-next-line @typescript-eslint/ban-ts-comment
          // @ts-ignore
          const d: any[] = await connection._rpcBatchRequest(i)
          return d.map((ii) => ii.result.value)
        }),
      )
    ).flat()
  } else {
    try {
      results = await Promise.all(
        transactions.map(async (transaction) => await (await connection.simulateTransaction(transaction)).value),
      )
    } catch (error) {
      if (error instanceof Error) {
        return logger.throwError('failed to get info for multiple accounts', Logger.errors.RPC_ERROR, {
          message: error.message,
        })
      }
    }
  }

  return results
}

export async function splitTxAndSigners<T extends TxVersion>({
  connection,
  makeTxVersion,
  innerTransaction,
  lookupTableCache,
  computeBudgetConfig,
  payer,
}: {
  connection: Connection
  makeTxVersion: T
  innerTransaction: InnerTransaction[]
  lookupTableCache?: CacheLTA
  computeBudgetConfig?: ComputeBudgetConfig
  payer: PublicKey
}): Promise<(T extends typeof TxVersion.LEGACY ? InnerSimpleLegacyTransaction : InnerSimpleV0Transaction)[]> {
  const lookupTableAddressAccount = lookupTableCache ?? {}
  const allLTA = [
    ...new Set<string>(innerTransaction.map((i) => (i.lookupTableAddress ?? []).map((ii) => ii.toString())).flat()),
  ]
  const needCacheLTA: PublicKey[] = []
  for (const item of allLTA) {
    if (lookupTableAddressAccount[item] === undefined) needCacheLTA.push(new PublicKey(item))
  }

  const newCacheLTA = await getMultipleLookupTableInfo({ connection, address: needCacheLTA })

  for (const [key, value] of Object.entries(newCacheLTA)) lookupTableAddressAccount[key] = value

  const addComputeBudgetInnerTx = computeBudgetConfig
    ? addComputeBudget(computeBudgetConfig).innerTransaction
    : undefined

  const transactions: (T extends typeof TxVersion.LEGACY ? InnerSimpleLegacyTransaction : InnerSimpleV0Transaction)[] =
    []

  let itemIns: InnerTransaction[] = []

  for (const itemInnerTx of innerTransaction) {
    if (itemInnerTx.instructions.length === 0) continue
    const _itemIns = [...itemIns, itemInnerTx]
    const _addComputeBudgetInnerTx = addComputeBudgetInnerTx ? [addComputeBudgetInnerTx, ..._itemIns] : _itemIns

    if (
      itemIns.length < 12 &&
      (checkTx({ makeTxVersion, innerIns: _addComputeBudgetInnerTx, payer, lookupTableAddressAccount }) ||
        checkTx({ makeTxVersion, innerIns: _itemIns, payer, lookupTableAddressAccount }))
    ) {
      itemIns.push(itemInnerTx)
    } else {
      if (itemIns.length === 0) throw Error(' item ins too big ')

      let lookupTableAddress: undefined | CacheLTA = undefined
      if (makeTxVersion === TxVersion.V0) {
        lookupTableAddress = {}
        for (const item of [
          ...new Set<string>(
            itemIns
              .map((i) => i.lookupTableAddress ?? [])
              .flat()
              .map((i) => i.toString()),
          ),
        ]) {
          if (lookupTableAddressAccount[item] !== undefined) lookupTableAddress[item] = lookupTableAddressAccount[item]
        }
      }
      if (
        checkTx({
          makeTxVersion,
          innerIns: addComputeBudgetInnerTx ? [addComputeBudgetInnerTx, ...itemIns] : itemIns,
          payer,
          lookupTableAddressAccount,
        })
      ) {
        // add fee is ok
        const _i = addComputeBudgetInnerTx ? [addComputeBudgetInnerTx, ...itemIns] : itemIns
        transactions.push({
          instructionTypes: _i.map((i) => i.instructionTypes).flat(),
          instructions: _i.map((i) => i.instructions).flat(),
          signers: itemIns.map((i) => i.signers).flat(),
          lookupTableAddress,
        } as any)
      } else {
        transactions.push({
          instructionTypes: itemIns.map((i) => i.instructionTypes).flat(),
          instructions: itemIns.map((i) => i.instructions).flat(),
          signers: itemIns.map((i) => i.signers).flat(),
          lookupTableAddress,
        } as any)
      }

      itemIns = [itemInnerTx]
    }
  }

  if (itemIns.length > 0) {
    let lookupTableAddress: undefined | CacheLTA = undefined
    if (makeTxVersion === TxVersion.V0) {
      lookupTableAddress = {}
      for (const item of [
        ...new Set<string>(
          itemIns
            .map((i) => i.lookupTableAddress ?? [])
            .flat()
            .map((i) => i.toString()),
        ),
      ]) {
        if (lookupTableAddressAccount[item] !== undefined) lookupTableAddress[item] = lookupTableAddressAccount[item]
      }
    }
    if (
      checkTx({
        makeTxVersion,
        innerIns: addComputeBudgetInnerTx ? [addComputeBudgetInnerTx, ...itemIns] : itemIns,
        payer,
        lookupTableAddressAccount,
      })
    ) {
      const _i = addComputeBudgetInnerTx ? [addComputeBudgetInnerTx, ...itemIns] : itemIns
      transactions.push({
        instructionTypes: _i.map((i) => i.instructionTypes).flat(),
        instructions: _i.map((i) => i.instructions).flat(),
        signers: itemIns.map((i) => i.signers).flat(),
        lookupTableAddress,
      } as any)
    } else {
      transactions.push({
        instructionTypes: itemIns.map((i) => i.instructionTypes).flat(),
        instructions: itemIns.map((i) => i.instructions).flat(),
        signers: itemIns.map((i) => i.signers).flat(),
        lookupTableAddress,
      } as any)
    }
  }

  return transactions
}

function checkTx({
  makeTxVersion,
  innerIns,
  payer,
  lookupTableAddressAccount,
}: {
  makeTxVersion: TxVersion
  innerIns: InnerTransaction[]
  payer: PublicKey
  lookupTableAddressAccount?: CacheLTA
}) {
  const instructions = innerIns.map((i) => i.instructions).flat()
  const signers = [
    ...new Set<string>(
      innerIns
        .map((i) => i.signers)
        .flat()
        .map((i) => i.publicKey.toString()),
    ),
  ].map((i) => new PublicKey(i))
  const needLTA = innerIns
    .map((i) => i.lookupTableAddress ?? [])
    .flat()
    .map((i) => i.toString())
  const lTaCache: CacheLTA = {}
  const _lookupTableAddressAccount = lookupTableAddressAccount ?? {}
  for (const item of needLTA) {
    if (_lookupTableAddressAccount[item] !== undefined) {
      lTaCache[item] = _lookupTableAddressAccount[item]
    }
  }
  return makeTxVersion === TxVersion.V0
    ? _checkV0Tx({ instructions, payer, lookupTableAddressAccount: lTaCache })
    : _checkLegacyTx({ instructions, payer, signers })
}

export const MAX_BASE64_SIZE = 1644

function _checkLegacyTx({
  instructions,
  payer,
  signers,
}: {
  instructions: TransactionInstruction[]
  payer: PublicKey
  signers: PublicKey[]
}) {
  return forecastTransactionSize(instructions, [payer, ...signers])
}
function _checkV0Tx({
  instructions,
  payer,
  lookupTableAddressAccount,
}: {
  instructions: TransactionInstruction[]
  payer: PublicKey
  lookupTableAddressAccount?: CacheLTA
}) {
  const transactionMessage = new TransactionMessage({
    payerKey: payer,
    recentBlockhash: Keypair.generate().publicKey.toString(),
    instructions,
  })

  const messageV0 = transactionMessage.compileToV0Message(Object.values(lookupTableAddressAccount ?? {}))
  try {
    return Buffer.from(messageV0.serialize()).toString('base64').length < MAX_BASE64_SIZE
  } catch (error) {
    return false
  }
}

export interface CacheLTA {
  [key: string]: AddressLookupTableAccount
}
export async function getMultipleLookupTableInfo({
  connection,
  address,
}: {
  connection: Connection
  address: PublicKey[]
}) {
  const dataInfos = await getMultipleAccountsInfo(
    connection,
    [...new Set<string>(address.map((i) => i.toString()))].map((i) => new PublicKey(i)),
  )

  const outDict: CacheLTA = {}
  for (let i = 0; i < address.length; i++) {
    const info = dataInfos[i]
    const key = address[i]
    if (!info) continue
    outDict[key.toString()] = new AddressLookupTableAccount({
      key,
      state: AddressLookupTableAccount.deserialize(info.data),
    })
  }

  return outDict
}