import type { Currency } from './currency-type.js';
import { NativeCurrency, nativeCurrencyToSerializableErc20TokenType } from './native-currency.js';
import { WETH } from './common-tokens.js';
import type { SerializableErc20TokenType } from './base-currency.js';

/**
 * Ether is the main usage of a 'native' currency, i.e. for Ethereum mainnet and all testnets
 */
export class Ether extends NativeCurrency {
  protected constructor(chainId: number) {
    super({
      chainId,
      decimals: 18,
      symbol: 'ETH',
      name: 'Ether',
    });
  }

  get wrapped() {
    const chainId = this.chainId;
    const weth = WETH[chainId];
    if (!weth) {
      throw new Error(`No WETH available on chain ${chainId}`);
    }

    return weth;
  }

  private static _etherCache: { [chainId: number]: Ether } = {};

  static onChain(chainId: number): Ether {
    return this._etherCache[chainId] || (this._etherCache[chainId] = new Ether(chainId));
  }

  /**
   * Returns true if the two tokens are equivalent, i.e. have the same chainId and address.
   * @param other other token to compare
   */
  public equals(other: Currency): boolean {
    return other.isNative && this.chainId === other.chainId && this.address === other.address;
  }

  public toObject(): SerializableErc20TokenType {
    return nativeCurrencyToSerializableErc20TokenType(this);
  }
}