import { Conflux } from "js-conflux-sdk"
// TransactionMeta
import { EventEmitter } from "events";
import { JsonRpcSigner } from "../signers";


export class BaseProvider extends EventEmitter {
  public cfxClient: Conflux;

  /**
   * Call a json rpc method with params
   *
   * @param {object} data
   * @param {string} data.method - Json rpc method name.
   * @param {array} [data.params] - Json rpc method params.
   * @return {Promise<*>} Json rpc method return value.
   *
   */
  public request({ method, params = [] }): Promise<any> {
    let result = this.cfxClient.request({ method, params});
    return result;
  }

  /**
   * Call a json rpc method with params
   *
   * @param {string} method - Json rpc method name.
   * @param {any[]} params - Json rpc method params.
   * @return {Promise<*>} Json rpc method return value.
   *
   */
  public call(method: string, ...params: any[]): Promise<any> {
    return this.cfxClient.provider.call(method, ...params);
  }

  /**
   * Send a json rpc method request
   *
   * @param {string} method - Json rpc method name.
   * @param {array} [params] - Json rpc method params.
   * @return {Promise<*>} Json rpc method return value.
   *
   * @example
   * > await provider.send("cfx_epochNumber");
   * > await provider.send("cfx_getBlockByHash", [blockHash]);
   */
  async send(method: string, params: any[]): Promise<any>  {
    return this.cfxClient.provider.send({ method, params });
  }

  // -------------------------------- epoch -----------------------------------
  /**
   * Returns the epoch number of given parameter.
   *
   * @param {string|number} [epochNumber="latest_state"] - See [format.epochNumber](utils.md#util/format.js/format/(static)epochNumber)
   * @return {Promise<number>} integer of the current epoch number of given parameter.
   *
   * @example
   * > await provider.getEpochNumber();
   443
   */
  public getBlockNumber(): Promise<number> {
    return this.cfxClient.getEpochNumber();
  }

  /**
   * Returns the balance of the account of given address.
   *
   * @param {string} address - The address to get the balance of.
   * @param {string|number} [epochNumber="latest_state"] - See [format.epochNumber](utils.md#util/format.js/format/(static)epochNumber)
   * @return {Promise<BigInt>} The balance in Drip.
   *
   */
  public getBalance(walletAddress: string, epochNumber:string|number = "latest_state"): Promise<BigInt> {
    let balance = this.cfxClient.getBalance(walletAddress, epochNumber);
    return balance;
  }

  /**
   * Returns information about a block by hash.
   *
   * @param {string} blockHash - hash of a block.
   * @param {boolean} [detail=false] - If `true` it returns the full transaction objects, if `false` only the hashes of the transactions.
   * @return {Promise<object|null>} A block object, or null when no block was found:
   * 
   */ 
  public getBlockByHash(blockHash: string, detail: boolean): Promise<object|null> {
    return this.cfxClient.getBlockByHash(blockHash, detail);
  }

  /**
   * Returns information about a block by epoch number.
   *
   * @param {string|number} epochNumber - See [format.epochNumber](utils.md#util/format.js/format/(static)epochNumber)
   * @param {boolean} [detail=false] - If `true` it returns the full transaction objects, if `false` only the hashes of the transactions.
   * @return {Promise<object|null>} See `getBlockByHash`
   *
   */ 
   public getBlockByNumber(blockNumber: string|number, detail: boolean): Promise<object|null> {
    return this.cfxClient.getBlockByEpochNumber(blockNumber, detail);
  }

  /**
   * Returns information about a block by epoch number.
   *
   * @param {string|number} epochNumber - See [format.epochNumber](utils.md#util/format.js/format/(static)epochNumber)
   * @param {boolean} [detail=false] - If `true` it returns the full transaction objects, if `false` only the hashes of the transactions.
   * @return {Promise<object|null>} See `getBlockByHash`
   *
   */ 
  public getBlock(blockNumberOrHash: number | string, detail: boolean): Promise<object|null> {
    if (blockNumberOrHash.toString().startsWith("0x")) {
      return this.getBlockByHash(blockNumberOrHash.toString(), detail);
    } else {
      return this.getBlockByNumber(blockNumberOrHash, detail);
    }
  }

  // -------------------------------- transaction -----------------------------------
    /**
   * Returns the information about a transaction requested by transaction hash.
   *
   * @param {string} transactionHash - hash of a transaction
   * @return {Promise<object|null>} transaction object, or `null` when no transaction was found:
   * 
   */ 
  public getTransactionByHash(blockHash: string): Promise<object|null> {
    return this.cfxClient.getTransactionByHash(blockHash);
  }

  // -------------------------------- special for sponsor -----------------------------------
  /**
   * Returns the sponsor info of given contract.
   *
   * @param {string} address - Address to contract.
   * @param {string|number} [epochNumber="latest_state"] - See [format.epochNumber](utils.md#util/format.js/format/(static)epochNumber)
   * @return {Promise<object>} A sponsor info object
   * 
   */
  public getSponsorInfo(address: string, epochNumber: string|number): Promise<object> {
    return this.cfxClient.getSponsorInfo(address, epochNumber);
  }

  public getAccounts(): Promise<object> {
    return this.cfxClient.request({ method: "cfx_accounts" });
  }

  public getNetwork(ChainIdOrName?: string): Promise<object> {
    return this.cfxClient.getStatus();
  }

  // -------------------------------- signer -----------------------------------
  public async getSigner(addressOrIndex: string | number = 0) {
    var address: string;
    if (typeof (addressOrIndex) === "string") {
      address = addressOrIndex;
      var index = 0;
    } else if (typeof (addressOrIndex) === "number") {
      var index = addressOrIndex;
      const addressArray = await this.cfxClient.request({ method: "cfx_accounts" });
      address = addressArray[addressOrIndex];
    }
    // var accountArray = await this.cfxClient.request({ method: "cfx_requestAccounts" });
    var account = await this.cfxClient.getAccount(address)
    return new JsonRpcSigner(this, address, account);
  }

  // -------------------------------- unimplemented -----------------------------------
  public getChainId(): Promise<number> {
    let result = this.cfxClient.request({ method: "cfx_chainId"});
    return result;
  }
}