import { PublicKey, Connection } from '@solana/web3.js';
import BN from 'bn.js'; // eslint-disable-line @typescript-eslint/no-unused-vars
import * as borsh from '@project-serum/borsh'; // eslint-disable-line @typescript-eslint/no-unused-vars
import * as types from '../types'; // eslint-disable-line @typescript-eslint/no-unused-vars
import { PROGRAM_ID } from '../programId';

export interface OperationStateFields {
  /** Bump to identify PDA */
  bump: number;
  /** Address of the operation owner */
  operationOwners: Array<PublicKey>;
  /** The mint address of whitelist to emmit reward */
  whitelistMints: Array<PublicKey>;
}

export interface OperationStateJSON {
  /** Bump to identify PDA */
  bump: number;
  /** Address of the operation owner */
  operationOwners: Array<string>;
  /** The mint address of whitelist to emmit reward */
  whitelistMints: Array<string>;
}

/** Holds the current owner of the factory */
export class OperationState {
  /** Bump to identify PDA */
  readonly bump: number;
  /** Address of the operation owner */
  readonly operationOwners: Array<PublicKey>;
  /** The mint address of whitelist to emmit reward */
  readonly whitelistMints: Array<PublicKey>;

  static readonly discriminator = Buffer.from([19, 236, 58, 237, 81, 222, 183, 252]);

  static readonly layout = borsh.struct([
    borsh.u8('bump'),
    borsh.array(borsh.publicKey(), 10, 'operationOwners'),
    borsh.array(borsh.publicKey(), 100, 'whitelistMints'),
  ]);

  constructor(fields: OperationStateFields) {
    this.bump = fields.bump;
    this.operationOwners = fields.operationOwners;
    this.whitelistMints = fields.whitelistMints;
  }

  static async fetch(c: Connection, address: PublicKey): Promise<OperationState | null> {
    const info = await c.getAccountInfo(address);

    if (info === null) {
      return null;
    }
    if (!info.owner.equals(PROGRAM_ID)) {
      throw new Error("account doesn't belong to this program");
    }

    return this.decode(info.data);
  }

  static async fetchMultiple(c: Connection, addresses: PublicKey[]): Promise<Array<OperationState | null>> {
    const infos = await c.getMultipleAccountsInfo(addresses);

    return infos.map((info) => {
      if (info === null) {
        return null;
      }
      if (!info.owner.equals(PROGRAM_ID)) {
        throw new Error("account doesn't belong to this program");
      }

      return this.decode(info.data);
    });
  }

  static decode(data: Buffer): OperationState {
    if (!data.slice(0, 8).equals(OperationState.discriminator)) {
      throw new Error('invalid account discriminator');
    }

    const dec = OperationState.layout.decode(data.slice(8));

    return new OperationState({
      bump: dec.bump,
      operationOwners: dec.operationOwners,
      whitelistMints: dec.whitelistMints,
    });
  }

  toJSON(): OperationStateJSON {
    return {
      bump: this.bump,
      operationOwners: this.operationOwners.map((item) => item.toString()),
      whitelistMints: this.whitelistMints.map((item) => item.toString()),
    };
  }

  static fromJSON(obj: OperationStateJSON): OperationState {
    return new OperationState({
      bump: obj.bump,
      operationOwners: obj.operationOwners.map((item) => new PublicKey(item)),
      whitelistMints: obj.whitelistMints.map((item) => new PublicKey(item)),
    });
  }
}