import { PublicKey } from '@solana/web3.js';
import * as fs from 'fs';

import {
  _coinsUrl,
  _mainnetChainId,
  _path,
  _stablecoinsUrl,
  _tokenListUrl,
} from './constants';
import { CoinMap, Json } from './types';
import {
  CoingeckoCoinsSchema,
  CoingeckoStablecoinsSchema,
  CoingeckoStablecoinSchema,
  CoingeckoTokenListSchema,
  CoingeckoTokenListSchemaToken,
  CoingeckoCoinSchema,
} from './schema';
import { create } from 'superstruct';
import axios from 'axios';
import { fetchOldTokens } from '../tokenRegistry/tokenList';
import config from '../config';

async function fetchTokensAndWriteToFile() {
  // get the coingecko token Public keys and their coingecko ids.
  const coins = await fetchCoins();
  // get the coingecko tokens from the tokenlist and match them with the coingecko ids.
  const coingecko = await matchTokens(coins);
  // filter out unwanted tokens
  const filteredTokens = filterUndesiredTokens(coingecko);
  // write the coingecko tokens to the tokenlist file.
  await writeToFile(filteredTokens);
}

function notEmpty<TValue>(value: TValue | null | undefined): value is TValue {
  return value !== null && value !== undefined;
}

async function fetchCoins(): Promise<CoinMap> {
  const config = {
    headers: {
      'Accept-Encoding': '*',
    },
  };

  const responses = await Promise.all(
    [_coinsUrl, _stablecoinsUrl].map((url) => axios.get(url, config))
  );

  const coins = create(responses[0], CoingeckoCoinsSchema).data;

  /* console.log("coins: ", coins); */

  const stablecoins = create(responses[1], CoingeckoStablecoinsSchema).data;

  /* console.log("stablecoins: ", stablecoins); */

  const ct = coins
    .map((coin) => {
      const solAddress = coin.platforms?.solana;
      if (typeof solAddress !== 'string') return null;

      const coingeckoId = coin?.id;
      if (typeof coingeckoId !== 'string') return null;

      const isStablecoin = stablecoins.some((st) => st.id === coingeckoId);

      return { [solAddress]: { coingeckoId, isStablecoin } };
    })
    .filter(notEmpty)
    .reduce((prev, curr) => ({ ...prev, ...curr }), {});

  /* console.log("ct: ", JSON.stringify(ct, null, 4)); */

  return ct;
}

function addSolanaToken(coins: any) {
  const solanaToken = {
    chainId: 101,
    address: PublicKey.default.toString(),
    name: 'Solana',
    symbol: 'SOL',
    decimals: 9,
    logoURI:
      'https://assets.coingecko.com/coins/images/21629/thumb/solana.jpg?1639626543',
    extensions: { coingeckoId: 'solana' },
  };

  coins.push(solanaToken);

  return coins;
}

function filterUndesiredTokens(tokens: any) {
  function isUndesired(coin: CoingeckoCoinSchema | CoingeckoStablecoinSchema) {
    if (!coin?.name || !coin?.symbol) return true;

    const undesiredWords = config.undesiredWords;

    const isInName = undesiredWords.some(function (word) {
      return coin.name.toLowerCase().trim().indexOf(word) !== -1;
    });

    const isInSymbol = undesiredWords.some(function (word) {
      return coin.symbol.toLowerCase().trim().indexOf(word) !== -1;
    });

    return isInName || isInSymbol;
  }

  return {
    ...tokens,
    tokens: tokens.tokens.filter((token: any) => !isUndesired(token)),
  };
}

function matchCoingeckoAndOldTokens(cgData: CoingeckoTokenListSchema) {
  const coingecko = create(cgData, CoingeckoTokenListSchema);

  // set the chainId to 101 for the coingecko tokens
  for (const token of coingecko.tokens) {
    token.chainId = 101;
  }

  const oldTokens = fetchOldTokens();

  // gets the tokens from both lists, but if the token is in both lists, it will take the one from the old list.
  // I do this to get the devnet and testnet tokens, that are not present in the coingecko URL

  const allTokens = [...coingecko.tokens];

  for (const oldToken of oldTokens.tokens) {
    const found = allTokens.find(
      (token) =>
        token.address === oldToken.address && token.chainId === oldToken.chainId
    );

    if (!found) {
      /* console.log("oldToken: ", oldToken); */
      allTokens.push(oldToken);
    }
  }

  /* console.log("allTOkens: ", JSON.stringify(allTokens, null, 4)); */

  coingecko.tokens = allTokens;

  return coingecko;
}

async function matchTokens(coins: CoinMap) /* : Promise<Json> */ {
  const config = {
    headers: {
      'Accept-Encoding': '*',
    },
  };
  const rawCoingecko = await axios.get(_tokenListUrl, config);

  /* console.log("responses: ", rawCoingecko.data); */

  const coingecko =
    /* create(rawCoingecko.data, CoingeckoTokenListSchema); */ matchCoingeckoAndOldTokens(
      rawCoingecko.data
    );

  coingecko.tokens = coingecko.tokens
    .filter((token) => typeof token === 'object')
    .map((token) => updateToken(token, coins));

  const newCgTokens = addSolanaToken(coingecko.tokens);

  coingecko.tokens = newCgTokens;

  return coingecko;
}

function updateToken(
  token: CoingeckoTokenListSchemaToken,
  coins: CoinMap
): CoingeckoTokenListSchemaToken {
  const address = token.address;

  const coinData = address ? coins[address] : undefined;

  const coingeckoId = coinData?.coingeckoId;
  const isStablecoin = coinData?.isStablecoin || false;

  if (coingeckoId != null) token.extensions = { coingeckoId };
  if (isStablecoin) token.tags = ['stablecoin'];

  /* if (token.chainId == 103) console.log("token: ", token); */

  if (!token.chainId) token.chainId = _mainnetChainId;

  token.logoURI =
    typeof token.logoURI === 'string' ? updateLogoUri(token.logoURI) : '';

  return token;
}

function updateLogoUri(uri: string): string {
  if (uri == '') return '';

  try {
    const url = new URL(uri);
    url.pathname = url.pathname.replace('thumb', 'large');

    return url.toString();
  } catch (error) {
    console.log('Invalid URI:', uri);
    throw error;
  }
}

async function writeToFile(coingecko: Json): Promise<void> {
  const file = _path;

  let nonMainnetTokens: Json[] | undefined;
  try {
    const contents = fs.readFileSync(file, 'utf8');
    const data = JSON.parse(contents);
    nonMainnetTokens = data.tokens.filter(
      (token: { chainId: number }) => token.chainId !== _mainnetChainId
    );
  } catch (error) {
    // do nothing
  }

  const allTokens = {
    ...coingecko,
    tokens: [...(coingecko.tokens || []), ...(nonMainnetTokens || [])],
  };

  /*   console.log("allTokens: ", JSON.stringify(allTokens, null, 4));
  console.log("non-mainnet: ", JSON.stringify(nonMainnetTokens, null, 4)); */

  await fs.promises.writeFile(file, JSON.stringify(allTokens));
}

export default fetchTokensAndWriteToFile;