import { AbiItem } from "web3-utils";

import aaveV2ABI from "~/abis/read/aaveV2.json";
import { computed, ref, watch } from "@nuxtjs/composition-api";
import { useDSA } from "./useDSA";
import { useWeb3 } from "./useWeb3";
import BigNumber from "bignumber.js";
import atokensV2 from "~/constant/atokensV2";
import tokens from "~/constant/tokens";
import { Network } from "./useNetwork";
import { useBigNumber } from "./useBigNumber";
const { times, isZero, div, max } = useBigNumber();

const position = ref<any>({
  totalSupplyInEth: new BigNumber(0),
  totalBorrowInEth: new BigNumber(0),
  totalBorrowStableInEth: new BigNumber(0),
  totalBorrowVariableInEth: new BigNumber(0),
  maxBorrowLimitInEth: new BigNumber(0),
  maxBorrowLiquidityLimitInEth: new BigNumber(0),
  ethPriceInUsd: "0"
});
const totalSupply = computed(() =>
  position.value
    ? times(
        position.value.totalSupplyInEth,
        position.value.ethPriceInUsd
      ).toFixed()
    : 0
);

const totalBorrow = computed(() =>
  position.value
    ? times(
        position.value.totalBorrowInEth,
        position.value.ethPriceInUsd
      ).toFixed()
    : 0
);

const status = computed(() => {
  if (!position.value) {
    return "0";
  }

  if (
    isZero(position.value.totalSupplyInEth) &&
    !isZero(position.value.totalBorrowInEth)
  )
    return "1.1";
  if (isZero(position.value.totalSupplyInEth)) return "0";

  return max(
    div(position.value.totalBorrowInEth, position.value.totalSupplyInEth),
    "0"
  ).toFixed();
});

export function useAaveV2Position() {
  const { web3, chainId, networkName } = useWeb3();
  const { activeAccount } = useDSA();

  const resolver =
    chainId.value === 1
      ? "0xFb3a1D56eD56F046721B9aCa749895100754578b"
      : "0xD6E0803d0eB34af8Ea135835512D7E77960b28F1";

  const fetchPosition = async () => {
    if (!web3.value) {
      return;
    }

    if (!activeAccount.value) {
      return;
    }

    const aaveResolverInstance = new web3.value.eth.Contract(
      aaveV2ABI as AbiItem[],
      resolver
    );

    const aaveTokensArr = atokensV2[networkName.value].allTokens.map(
      a => tokens[networkName.value].getTokenByKey(a.root).address
    );

    const aaveRawData = await aaveResolverInstance.methods
      .getPosition(activeAccount.value.address, aaveTokensArr)
      .call();

    const newPos = calculateAavePosition(aaveRawData, networkName.value);

    return newPos;
  };

  watch(
    web3,
    async val => {
      if (val) {
        position.value = await fetchPosition();
      }
    },
    { immediate: true }
  );

  watch(
    activeAccount,
    async val => {
      if (val) {
        position.value = await fetchPosition();
      }
    },
    { immediate: true }
  );

  return {
    position,
    fetchPosition,
    totalSupply,
    totalBorrow,
    status
  };
}

function calculateAavePosition(res: any[], network: Network = Network.Mainnet) {
  try {
    const newPos = {
      totalSupplyInEth: new BigNumber(0),
      totalBorrowInEth: new BigNumber(0),
      totalBorrowStableInEth: new BigNumber(0),
      totalBorrowVariableInEth: new BigNumber(0),
      maxBorrowLimitInEth: new BigNumber(0),
      maxBorrowLiquidityLimitInEth: new BigNumber(0)
      // tokens: {},
    };
    const dataPos = [];
    atokensV2[network].allTokens.forEach((atoken, i) => {
      const key = atoken.address;

      /* eslint-disable no-unused-vars */
      const [
        priceInEthInWei,
        priceInUsdInWei,
        supplyBalanceInWei,
        borrowStableBalanceInWei,
        borrowVariableBalanceInWei,
        supplyRatePerBlock,
        borrowStableRatePerBlock,
        userStableBorrowRatePerBlock,
        borrowVariableRatePerBlock,
        isCollateralEnabled,
        AaveTokenData
      ] = res[0][i];

      const [
        ltv,
        threshold,
        reserveFactor,
        usageAsCollEnabled,
        borrowEnabled,
        stableBorrowEnabled,
        isActive,
        isFrozen,
        totalSupply,
        availableLiquidity,
        totalStableDebt,
        totalVariableDebt,
        collateralEmission,
        debtEmission
      ] = AaveTokenData;
      /* eslint-enable no-unused-vars */

      const decimals = tokens[network].getTokenByKey(atoken.root).decimals;
      const root = atoken.root;
      const factor = new BigNumber(ltv).dividedBy(1e4);
      const priceInEth = new BigNumber(priceInEthInWei).dividedBy(1e18);
      const priceInUsd = new BigNumber(priceInUsdInWei)
        .dividedBy(1e18)
        .toFixed();
      const supply = new BigNumber(supplyBalanceInWei).dividedBy(
        10 ** decimals
      );
      const borrowStable = new BigNumber(borrowStableBalanceInWei).dividedBy(
        10 ** decimals
      );
      const borrowVariable = new BigNumber(
        borrowVariableBalanceInWei
      ).dividedBy(10 ** decimals);
      const supplyRate = new BigNumber(supplyRatePerBlock)
        .dividedBy(1e27)
        .toFixed();
      const supplyYield = supplyRate;
      const borrowStableRate = new BigNumber(borrowStableRatePerBlock)
        .dividedBy(1e27)
        .toFixed();
      const userBorrowStableRate = new BigNumber(userStableBorrowRatePerBlock)
        .dividedBy(1e27)
        .toFixed();
      const borrowVariableRate = new BigNumber(borrowVariableRatePerBlock)
        .dividedBy(1e27)
        .toFixed();
      const borrowStableYield = borrowStableRate;
      const borrowVariableYield = borrowVariableRate;
      const liquidity = new BigNumber(availableLiquidity)
        .dividedBy(10 ** decimals)
        .multipliedBy(0.9999)
        .toFixed();
      const totalSupplied = new BigNumber(totalSupply)
        .dividedBy(10 ** decimals)
        .multipliedBy(priceInUsd);
      const totalDebt = new BigNumber(totalVariableDebt)
        .dividedBy(10 ** decimals)
        .multipliedBy(priceInUsd);
      const supplyRewardRate = new BigNumber(collateralEmission)
        .multipliedBy(31536000)
        .dividedBy(1e18)
        .dividedBy(totalSupplied)
        .toFixed();
      const borrowRewardRate = new BigNumber(debtEmission)
        .multipliedBy(31536000)
        .dividedBy(1e18)
        .dividedBy(totalDebt)
        .toFixed();

      newPos.totalSupplyInEth = newPos.totalSupplyInEth.plus(
        supply.multipliedBy(priceInEth)
      );
      newPos.maxBorrowLimitInEth = newPos.maxBorrowLimitInEth.plus(
        supply.multipliedBy(priceInEth).multipliedBy(factor)
      );
      newPos.maxBorrowLiquidityLimitInEth = newPos.maxBorrowLiquidityLimitInEth.plus(
        supply
          .multipliedBy(priceInEth)
          .multipliedBy((threshold / 10000).toString())
      );
      newPos.totalBorrowInEth = newPos.totalBorrowInEth.plus(
        borrowStable.plus(borrowVariable).multipliedBy(priceInEth)
      );
      newPos.totalBorrowStableInEth = newPos.totalBorrowStableInEth.plus(
        borrowStable.multipliedBy(priceInEth)
      );
      newPos.totalBorrowVariableInEth = newPos.totalBorrowVariableInEth.plus(
        borrowVariable.multipliedBy(priceInEth)
      );

      dataPos.push({
        key: root,
        aTokenAddr: key,
        aTokenBal: supplyBalanceInWei,
        aTokenKey: atoken.key,
        aDecimals: atoken.decimals.toString(),
        priceInEth: priceInEth.toFixed(),
        priceInUsd,
        supply: supply.toFixed(),
        borrowStable: borrowStable.toFixed(),
        borrow: borrowVariable.toFixed(), // TODO: change later
        supplyRate,
        supplyYield,
        borrowStableRate,
        userBorrowStableRate,
        borrowStableYield,
        borrowRate: borrowVariableRate, // TODO: change later
        borrowYield: borrowVariableYield, // TODO: change later
        factor: factor.toFixed(),
        liquidation: (threshold / 10000).toString(),
        isEnabledAsCollateral: isCollateralEnabled,
        borrowEnabled,
        stableBorrowEnabled,
        availableLiquidity: liquidity,
        supplyRewardRate,
        borrowRewardRate
      });
    });

    const totalSupplyInEthIsZero = newPos.totalSupplyInEth.isZero();
    const status = totalSupplyInEthIsZero
      ? 0
      : newPos.totalBorrowInEth.dividedBy(newPos.totalSupplyInEth).toFixed();
    const liquidation = totalSupplyInEthIsZero
      ? 0
      : newPos.maxBorrowLimitInEth.dividedBy(newPos.totalSupplyInEth).toFixed();
    const maxLiquidation = totalSupplyInEthIsZero
      ? 0
      : newPos.maxBorrowLiquidityLimitInEth
          .dividedBy(newPos.totalSupplyInEth)
          .toFixed();
    const ethPrice = new BigNumber(res[1].ethPriceInUsd)
      .dividedBy(1e8)
      .toFixed();
    const pendingRewards = new BigNumber(res[1].pendingRewards)
      .dividedBy(1e18)
      .toFixed();

    // @ts-ignore
    newPos.totalSupplyInEth = newPos.totalSupplyInEth.toFixed();
    // @ts-ignore
    newPos.totalBorrowInEth = newPos.totalBorrowInEth.toFixed();
    // @ts-ignore
    newPos.maxBorrowLimitInEth = newPos.maxBorrowLimitInEth.toFixed();
    // @ts-ignore
    newPos.totalBorrowStableInEth = newPos.totalBorrowStableInEth.toFixed();
    // @ts-ignore
    newPos.maxBorrowLiquidityLimitInEth = newPos.maxBorrowLiquidityLimitInEth.toFixed();
    // @ts-ignore
    newPos.totalBorrowVariableInEth = newPos.totalBorrowVariableInEth.toFixed();

    // @ts-ignore
    newPos.status = status;
    // @ts-ignore
    newPos.liquidation = liquidation;
    // @ts-ignore
    newPos.maxLiquidation = maxLiquidation;
    // @ts-ignore
    newPos.ethPriceInUsd = ethPrice;
    // @ts-ignore
    newPos.pendingRewards = pendingRewards;
    // @ts-ignore
    newPos.data = dataPos;

    return newPos;
  } catch (error) {
    console.error(error);
    return Promise.reject(error);
  }
}