import { arrayify, zeroPad } from "@ethersproject/bytes";
import { PublicKey } from "@solana/web3.js";
import { hexValue, hexZeroPad, sha256, stripZeros } from "ethers/lib/utils";
import { Provider as NearProvider } from "near-api-js/lib/providers";
import { ethers } from "ethers";
import {
  hexToNativeAssetStringAlgorand,
  nativeStringToHexAlgorand,
  uint8ArrayToNativeStringAlgorand,
} from "../algorand";
import { canonicalAddress, humanAddress } from "../cosmos";
import { buildTokenId } from "../cosmwasm/address";
import { isNativeDenom } from "../terra";
import {
  ChainId,
  ChainName,
  CHAIN_ID_ALGORAND,
  CHAIN_ID_APTOS,
  CHAIN_ID_INJECTIVE,
  CHAIN_ID_NEAR,
  CHAIN_ID_OSMOSIS,
  CHAIN_ID_PYTHNET,
  CHAIN_ID_SOLANA,
  CHAIN_ID_SUI,
  CHAIN_ID_TERRA,
  CHAIN_ID_TERRA2,
  CHAIN_ID_WORMCHAIN,
  CHAIN_ID_UNSET,
  coalesceChainId,
  isEVMChain,
  isTerraChain,
  CHAIN_ID_XPLA,
  CHAIN_ID_SEI,
  CHAIN_ID_BTC,
  CHAIN_ID_COSMOSHUB,
  CHAIN_ID_EVMOS,
  CHAIN_ID_KUJIRA,
  CHAIN_ID_NEUTRON,
  CHAIN_ID_CELESTIA,
} from "./consts";
import { hashLookup } from "./near";
import { getExternalAddressFromType, isValidAptosType } from "./aptos";
import { isValidSuiAddress } from "@mysten/sui.js";
import { isValidSuiType } from "../sui";

/**
 *
 * Returns true iff the hex string represents a native Terra denom.
 *
 * Native assets on terra don't have an associated smart contract address, just
 * like eth isn't an ERC-20 contract on Ethereum.
 *
 * The difference is that the EVM implementations of Portal don't support eth
 * directly, and instead require swapping to an ERC-20 wrapped eth (WETH)
 * contract first.
 *
 * The Terra implementation instead supports Terra-native denoms without
 * wrapping to CW-20 token first. As these denoms don't have an address, they
 * are encoded in the Portal payloads by the setting the first byte to 1.  This
 * encoding is safe, because the first 12 bytes of the 32-byte wormhole address
 * space are not used on Terra otherwise, as cosmos addresses are 20 bytes wide.
 */
export const isHexNativeTerra = (h: string): boolean => h.startsWith("01");

const isLikely20ByteCosmwasm = (h: string): boolean =>
  h.startsWith("000000000000000000000000");

export const nativeTerraHexToDenom = (h: string): string =>
  Buffer.from(stripZeros(hexToUint8Array(h.substr(2)))).toString("ascii");

export const uint8ArrayToHex = (a: Uint8Array): string =>
  Buffer.from(a).toString("hex");

export const hexToUint8Array = (h: string): Uint8Array => {
  if (h.startsWith("0x")) h = h.slice(2);
  return new Uint8Array(Buffer.from(h, "hex"));
};

/**
 *
 * Convert an address in a wormhole's 32-byte array representation into a chain's
 * native string representation.
 *
 * @throws if address is not the right length for the given chain
 */

export const tryUint8ArrayToNative = (
  a: Uint8Array,
  chain: ChainId | ChainName
): string => {
  const chainId = coalesceChainId(chain);
  if (isEVMChain(chainId)) {
    return hexZeroPad(hexValue(a), 20);
  } else if (chainId === CHAIN_ID_SOLANA || chainId === CHAIN_ID_PYTHNET) {
    return new PublicKey(a).toString();
  } else if (isTerraChain(chainId)) {
    const h = uint8ArrayToHex(a);
    if (isHexNativeTerra(h)) {
      return nativeTerraHexToDenom(h);
    } else {
      if (chainId === CHAIN_ID_TERRA2 && !isLikely20ByteCosmwasm(h)) {
        // terra 2 has 32 byte addresses for contracts and 20 for wallets
        return humanAddress("terra", a);
      }
      return humanAddress("terra", a.slice(-20));
    }
  } else if (chainId === CHAIN_ID_INJECTIVE) {
    const h = uint8ArrayToHex(a);
    return humanAddress("inj", isLikely20ByteCosmwasm(h) ? a.slice(-20) : a);
  } else if (chainId === CHAIN_ID_ALGORAND) {
    return uint8ArrayToNativeStringAlgorand(a);
  } else if (chainId == CHAIN_ID_WORMCHAIN) {
    const h = uint8ArrayToHex(a);
    return humanAddress(
      "wormhole",
      isLikely20ByteCosmwasm(h) ? a.slice(-20) : a
    );
  } else if (chainId === CHAIN_ID_XPLA) {
    const h = uint8ArrayToHex(a);
    return humanAddress("xpla", isLikely20ByteCosmwasm(h) ? a.slice(-20) : a);
  } else if (chainId === CHAIN_ID_SEI) {
    const h = uint8ArrayToHex(a);
    return humanAddress("sei", isLikely20ByteCosmwasm(h) ? a.slice(-20) : a);
  } else if (chainId === CHAIN_ID_NEAR) {
    throw Error("uint8ArrayToNative: Use tryHexToNativeStringNear instead.");
  } else if (chainId === CHAIN_ID_OSMOSIS) {
    throw Error("uint8ArrayToNative: Osmosis not supported yet.");
  } else if (chainId === CHAIN_ID_COSMOSHUB) {
    throw Error("uint8ArrayToNative: CosmosHub not supported yet.");
  } else if (chainId === CHAIN_ID_EVMOS) {
    throw Error("uint8ArrayToNative: Evmos not supported yet.");
  } else if (chainId === CHAIN_ID_KUJIRA) {
    throw Error("uint8ArrayToNative: Kujira not supported yet.");
  } else if (chainId === CHAIN_ID_NEUTRON) {
    throw Error("uint8ArrayToNative: Neutron not supported yet.");
  } else if (chainId === CHAIN_ID_CELESTIA) {
    throw Error("uint8ArrayToNative: Celestia not supported yet.");
  } else if (chainId === CHAIN_ID_SUI) {
    throw Error("uint8ArrayToNative: Sui not supported yet.");
  } else if (chainId === CHAIN_ID_APTOS) {
    throw Error("uint8ArrayToNative: Aptos not supported yet.");
  } else if (chainId === CHAIN_ID_UNSET) {
    throw Error("uint8ArrayToNative: Chain id unset");
  } else if (chainId === CHAIN_ID_BTC) {
    throw Error("uint8ArrayToNative: Btc not supported");
  } else {
    // This case is never reached
    const _: never = chainId;
    throw Error("Don't know how to convert address for chain " + chainId);
  }
};

export const tryHexToNativeStringNear = async (
  provider: NearProvider,
  tokenBridge: string,
  address: string
): Promise<string> => {
  const { found, value } = await hashLookup(provider, tokenBridge, address);
  if (!found) {
    throw new Error("Address not found");
  }
  return value;
};

/**
 *
 * Convert an address in a wormhole's 32-byte hex representation into a chain's native
 * string representation.
 *
 * @throws if address is not the right length for the given chain
 */
export const tryHexToNativeAssetString = (h: string, c: ChainId): string =>
  c === CHAIN_ID_ALGORAND
    ? // Algorand assets are represented by their asset ids, not an address
      hexToNativeAssetStringAlgorand(h)
    : tryHexToNativeString(h, c);

/**
 *
 * Convert an address in a wormhole's 32-byte hex representation into a chain's native
 * string representation.
 *
 * @deprecated since 0.3.0, use [[tryHexToNativeString]] instead.
 */
export const hexToNativeAssetString = (
  h: string | undefined,
  c: ChainId
): string | undefined => {
  if (!h) {
    return undefined;
  }
  try {
    return tryHexToNativeAssetString(h, c);
  } catch (e) {
    return undefined;
  }
};

/**
 *
 * Convert an address in a wormhole's 32-byte hex representation into a chain's native
 * string representation.
 *
 * @throws if address is not the right length for the given chain
 */
export const tryHexToNativeString = (
  h: string,
  c: ChainId | ChainName
): string => tryUint8ArrayToNative(hexToUint8Array(h), c);

/**
 *
 * Convert an address in a wormhole's 32-byte hex representation into a chain's native
 * string representation.
 *
 * @deprecated since 0.3.0, use [[tryHexToNativeString]] instead.
 */
export const hexToNativeString = (
  h: string | undefined,
  c: ChainId | ChainName
): string | undefined => {
  if (!h) {
    return undefined;
  }

  try {
    return tryHexToNativeString(h, c);
  } catch (e) {
    return undefined;
  }
};

/**
 *
 * Convert an address in a chain's native representation into a 32-byte hex string
 * understood by wormhole.
 *
 * @throws if address is a malformed string for the given chain id
 */
export const tryNativeToHexString = (
  address: string,
  chain: ChainId | ChainName
): string => {
  const chainId = coalesceChainId(chain);
  if (isEVMChain(chainId)) {
    return uint8ArrayToHex(zeroPad(arrayify(address), 32));
  } else if (chainId === CHAIN_ID_SOLANA || chainId === CHAIN_ID_PYTHNET) {
    return uint8ArrayToHex(zeroPad(new PublicKey(address).toBytes(), 32));
  } else if (chainId === CHAIN_ID_TERRA) {
    if (isNativeDenom(address)) {
      return (
        "01" +
        uint8ArrayToHex(
          zeroPad(new Uint8Array(Buffer.from(address, "ascii")), 31)
        )
      );
    } else {
      return uint8ArrayToHex(zeroPad(canonicalAddress(address), 32));
    }
  } else if (
    chainId === CHAIN_ID_TERRA2 ||
    chainId === CHAIN_ID_INJECTIVE ||
    chainId === CHAIN_ID_XPLA ||
    chainId === CHAIN_ID_SEI
  ) {
    return buildTokenId(chainId, address);
  } else if (chainId === CHAIN_ID_ALGORAND) {
    return nativeStringToHexAlgorand(address);
  } else if (chainId == CHAIN_ID_WORMCHAIN) {
    return uint8ArrayToHex(zeroPad(canonicalAddress(address), 32));
  } else if (chainId === CHAIN_ID_NEAR) {
    return uint8ArrayToHex(arrayify(sha256(Buffer.from(address))));
  } else if (chainId === CHAIN_ID_OSMOSIS) {
    throw Error("nativeToHexString: Osmosis not supported yet.");
  } else if (chainId === CHAIN_ID_COSMOSHUB) {
    throw Error("nativeToHexString: CosmosHub not supported yet.");
  } else if (chainId === CHAIN_ID_EVMOS) {
    throw Error("nativeToHexString: Evmos not supported yet.");
  } else if (chainId === CHAIN_ID_KUJIRA) {
    throw Error("nativeToHexString: Kujira not supported yet.");
  } else if (chainId === CHAIN_ID_NEUTRON) {
    throw Error("nativeToHexString: Neutron not supported yet.");
  } else if (chainId === CHAIN_ID_CELESTIA) {
    throw Error("nativeToHexString: Celestia not supported yet.");
  } else if (chainId === CHAIN_ID_SUI) {
    if (!isValidSuiType(address) && isValidSuiAddress(address)) {
      return uint8ArrayToHex(
        zeroPad(arrayify(address, { allowMissingPrefix: true }), 32)
      );
    }
    throw Error("nativeToHexString: Sui types not supported yet.");
  } else if (chainId === CHAIN_ID_BTC) {
    throw Error("nativeToHexString: Btc not supported yet.");
  } else if (chainId === CHAIN_ID_APTOS) {
    if (isValidAptosType(address)) {
      return getExternalAddressFromType(address);
    }

    return uint8ArrayToHex(
      zeroPad(arrayify(address, { allowMissingPrefix: true }), 32)
    );
  } else if (chainId === CHAIN_ID_UNSET) {
    throw Error("nativeToHexString: Chain id unset");
  } else {
    // If this case is reached
    const _: never = chainId;
    throw Error("Don't know how to convert address from chain " + chainId);
  }
};

/**
 *
 * Convert an address in a chain's native representation into a 32-byte hex string
 * understood by wormhole.
 *
 * @deprecated since 0.3.0, use [[tryNativeToHexString]] instead.
 * @throws if address is a malformed string for the given chain id
 */
export const nativeToHexString = (
  address: string | undefined,
  chain: ChainId | ChainName
): string | null => {
  if (!address) {
    return null;
  }
  return tryNativeToHexString(address, chain);
};

/**
 *
 * Convert an address in a chain's native representation into a 32-byte array
 * understood by wormhole.
 *
 * @throws if address is a malformed string for the given chain id
 */
export function tryNativeToUint8Array(
  address: string,
  chain: ChainId | ChainName
): Uint8Array {
  const chainId = coalesceChainId(chain);
  return hexToUint8Array(tryNativeToHexString(address, chainId));
}

/**
 *
 * Convert an address in a chain's native representation into a 32-byte hex string
 * understood by wormhole.
 *
 * @deprecated since 0.3.0, use [[tryUint8ArrayToNative]] instead.
 * @throws if address is a malformed string for the given chain id
 */
export const uint8ArrayToNative = (a: Uint8Array, chainId: ChainId) =>
  hexToNativeString(uint8ArrayToHex(a), chainId);

export function chunks<T>(array: T[], size: number): T[][] {
  return Array.apply<number, T[], T[][]>(
    0,
    new Array(Math.ceil(array.length / size))
  ).map((_, index) => array.slice(index * size, (index + 1) * size));
}

export function textToHexString(name: string): string {
  return Buffer.from(name, "binary").toString("hex");
}

export function textToUint8Array(name: string): Uint8Array {
  return new Uint8Array(Buffer.from(name, "binary"));
}

export function hex(x: string): Buffer {
  return Buffer.from(
    ethers.utils.hexlify(x, { allowMissingPrefix: true }).substring(2),
    "hex"
  );
}

export function ensureHexPrefix(x: string): string {
  return x.substring(0, 2) !== "0x" ? `0x${x}` : x;
}