import { PublicKey, Connection } from "@solana/web3.js";
import BN from "bn.js"; // eslint-disable-line @typescript-eslint/no-unused-vars
import * as borsh from "@coral-xyz/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 UserStateFields {
  userId: BN;
  farmState: PublicKey;
  owner: PublicKey;
  /** User data to account for rewards */
  legacyStake: BN;
  /**
   * Rewards tally used for computation of gained rewards
   * (scaled from `Decimal` representation).
   */
  rewardsTallyScaled: Array<BN>;
  /** Number of reward tokens ready for claim */
  rewardsIssuedUnclaimed: Array<BN>;
  lastClaimTs: Array<BN>;
  /**
   * User stake deposited and usable, generating rewards and fees.
   * (scaled from `Decimal` representation).
   */
  activeStakeScaled: BN;
  /**
   * User stake deposited but not usable and not generating rewards yet.
   * (scaled from `Decimal` representation).
   */
  pendingDepositStakeScaled: BN;
  /**
   * After this timestamp, pending user stake can be moved to user stake
   * Initialized to now() + delayed user stake period
   */
  pendingDepositStakeTs: BN;
  /**
   * User deposits unstaked, pending for withdrawal, not usable and not generating rewards.
   * (scaled from `Decimal` representation).
   */
  pendingWithdrawalUnstakeScaled: BN;
  /** After this timestamp, user can withdraw their deposit. */
  pendingWithdrawalUnstakeTs: BN;
  /** User bump used for account address validation */
  bump: BN;
  /** Delegatee used for initialisation - useful to check against */
  delegatee: PublicKey;
  lastStakeTs: BN;
  padding: Array<BN>;
}

export interface UserStateJSON {
  userId: string;
  farmState: string;
  owner: string;
  /** User data to account for rewards */
  legacyStake: string;
  /**
   * Rewards tally used for computation of gained rewards
   * (scaled from `Decimal` representation).
   */
  rewardsTallyScaled: Array<string>;
  /** Number of reward tokens ready for claim */
  rewardsIssuedUnclaimed: Array<string>;
  lastClaimTs: Array<string>;
  /**
   * User stake deposited and usable, generating rewards and fees.
   * (scaled from `Decimal` representation).
   */
  activeStakeScaled: string;
  /**
   * User stake deposited but not usable and not generating rewards yet.
   * (scaled from `Decimal` representation).
   */
  pendingDepositStakeScaled: string;
  /**
   * After this timestamp, pending user stake can be moved to user stake
   * Initialized to now() + delayed user stake period
   */
  pendingDepositStakeTs: string;
  /**
   * User deposits unstaked, pending for withdrawal, not usable and not generating rewards.
   * (scaled from `Decimal` representation).
   */
  pendingWithdrawalUnstakeScaled: string;
  /** After this timestamp, user can withdraw their deposit. */
  pendingWithdrawalUnstakeTs: string;
  /** User bump used for account address validation */
  bump: string;
  /** Delegatee used for initialisation - useful to check against */
  delegatee: string;
  lastStakeTs: string;
  padding: Array<string>;
}

export class UserState {
  readonly userId: BN;
  readonly farmState: PublicKey;
  readonly owner: PublicKey;
  /** User data to account for rewards */
  readonly legacyStake: BN;
  /**
   * Rewards tally used for computation of gained rewards
   * (scaled from `Decimal` representation).
   */
  readonly rewardsTallyScaled: Array<BN>;
  /** Number of reward tokens ready for claim */
  readonly rewardsIssuedUnclaimed: Array<BN>;
  readonly lastClaimTs: Array<BN>;
  /**
   * User stake deposited and usable, generating rewards and fees.
   * (scaled from `Decimal` representation).
   */
  readonly activeStakeScaled: BN;
  /**
   * User stake deposited but not usable and not generating rewards yet.
   * (scaled from `Decimal` representation).
   */
  readonly pendingDepositStakeScaled: BN;
  /**
   * After this timestamp, pending user stake can be moved to user stake
   * Initialized to now() + delayed user stake period
   */
  readonly pendingDepositStakeTs: BN;
  /**
   * User deposits unstaked, pending for withdrawal, not usable and not generating rewards.
   * (scaled from `Decimal` representation).
   */
  readonly pendingWithdrawalUnstakeScaled: BN;
  /** After this timestamp, user can withdraw their deposit. */
  readonly pendingWithdrawalUnstakeTs: BN;
  /** User bump used for account address validation */
  readonly bump: BN;
  /** Delegatee used for initialisation - useful to check against */
  readonly delegatee: PublicKey;
  readonly lastStakeTs: BN;
  readonly padding: Array<BN>;

  static readonly discriminator = Buffer.from([
    72, 177, 85, 249, 76, 167, 186, 126,
  ]);

  static readonly layout = borsh.struct([
    borsh.u64("userId"),
    borsh.publicKey("farmState"),
    borsh.publicKey("owner"),
    borsh.u64("legacyStake"),
    borsh.array(borsh.u128(), 10, "rewardsTallyScaled"),
    borsh.array(borsh.u64(), 10, "rewardsIssuedUnclaimed"),
    borsh.array(borsh.u64(), 10, "lastClaimTs"),
    borsh.u128("activeStakeScaled"),
    borsh.u128("pendingDepositStakeScaled"),
    borsh.u64("pendingDepositStakeTs"),
    borsh.u128("pendingWithdrawalUnstakeScaled"),
    borsh.u64("pendingWithdrawalUnstakeTs"),
    borsh.u64("bump"),
    borsh.publicKey("delegatee"),
    borsh.u64("lastStakeTs"),
    borsh.array(borsh.u64(), 50, "padding"),
  ]);

  constructor(fields: UserStateFields) {
    this.userId = fields.userId;
    this.farmState = fields.farmState;
    this.owner = fields.owner;
    this.legacyStake = fields.legacyStake;
    this.rewardsTallyScaled = fields.rewardsTallyScaled;
    this.rewardsIssuedUnclaimed = fields.rewardsIssuedUnclaimed;
    this.lastClaimTs = fields.lastClaimTs;
    this.activeStakeScaled = fields.activeStakeScaled;
    this.pendingDepositStakeScaled = fields.pendingDepositStakeScaled;
    this.pendingDepositStakeTs = fields.pendingDepositStakeTs;
    this.pendingWithdrawalUnstakeScaled = fields.pendingWithdrawalUnstakeScaled;
    this.pendingWithdrawalUnstakeTs = fields.pendingWithdrawalUnstakeTs;
    this.bump = fields.bump;
    this.delegatee = fields.delegatee;
    this.lastStakeTs = fields.lastStakeTs;
    this.padding = fields.padding;
  }

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

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

    return this.decode(info.data);
  }

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

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

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

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

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

    return new UserState({
      userId: dec.userId,
      farmState: dec.farmState,
      owner: dec.owner,
      legacyStake: dec.legacyStake,
      rewardsTallyScaled: dec.rewardsTallyScaled,
      rewardsIssuedUnclaimed: dec.rewardsIssuedUnclaimed,
      lastClaimTs: dec.lastClaimTs,
      activeStakeScaled: dec.activeStakeScaled,
      pendingDepositStakeScaled: dec.pendingDepositStakeScaled,
      pendingDepositStakeTs: dec.pendingDepositStakeTs,
      pendingWithdrawalUnstakeScaled: dec.pendingWithdrawalUnstakeScaled,
      pendingWithdrawalUnstakeTs: dec.pendingWithdrawalUnstakeTs,
      bump: dec.bump,
      delegatee: dec.delegatee,
      lastStakeTs: dec.lastStakeTs,
      padding: dec.padding,
    });
  }

  toJSON(): UserStateJSON {
    return {
      userId: this.userId.toString(),
      farmState: this.farmState.toString(),
      owner: this.owner.toString(),
      legacyStake: this.legacyStake.toString(),
      rewardsTallyScaled: this.rewardsTallyScaled.map((item) =>
        item.toString(),
      ),
      rewardsIssuedUnclaimed: this.rewardsIssuedUnclaimed.map((item) =>
        item.toString(),
      ),
      lastClaimTs: this.lastClaimTs.map((item) => item.toString()),
      activeStakeScaled: this.activeStakeScaled.toString(),
      pendingDepositStakeScaled: this.pendingDepositStakeScaled.toString(),
      pendingDepositStakeTs: this.pendingDepositStakeTs.toString(),
      pendingWithdrawalUnstakeScaled:
        this.pendingWithdrawalUnstakeScaled.toString(),
      pendingWithdrawalUnstakeTs: this.pendingWithdrawalUnstakeTs.toString(),
      bump: this.bump.toString(),
      delegatee: this.delegatee.toString(),
      lastStakeTs: this.lastStakeTs.toString(),
      padding: this.padding.map((item) => item.toString()),
    };
  }

  static fromJSON(obj: UserStateJSON): UserState {
    return new UserState({
      userId: new BN(obj.userId),
      farmState: new PublicKey(obj.farmState),
      owner: new PublicKey(obj.owner),
      legacyStake: new BN(obj.legacyStake),
      rewardsTallyScaled: obj.rewardsTallyScaled.map((item) => new BN(item)),
      rewardsIssuedUnclaimed: obj.rewardsIssuedUnclaimed.map(
        (item) => new BN(item),
      ),
      lastClaimTs: obj.lastClaimTs.map((item) => new BN(item)),
      activeStakeScaled: new BN(obj.activeStakeScaled),
      pendingDepositStakeScaled: new BN(obj.pendingDepositStakeScaled),
      pendingDepositStakeTs: new BN(obj.pendingDepositStakeTs),
      pendingWithdrawalUnstakeScaled: new BN(
        obj.pendingWithdrawalUnstakeScaled,
      ),
      pendingWithdrawalUnstakeTs: new BN(obj.pendingWithdrawalUnstakeTs),
      bump: new BN(obj.bump),
      delegatee: new PublicKey(obj.delegatee),
      lastStakeTs: new BN(obj.lastStakeTs),
      padding: obj.padding.map((item) => new BN(item)),
    });
  }
}
