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 ConfigFields {
  tokenBridge: PublicKey
  coreBridge: PublicKey
  authority: PublicKey
  validationConfig: types.RaydiumValidationConfigFields
}

export interface ConfigJSON {
  tokenBridge: string
  coreBridge: string
  authority: string
  validationConfig: types.RaydiumValidationConfigJSON
}

export class Config {
  readonly tokenBridge: PublicKey
  readonly coreBridge: PublicKey
  readonly authority: PublicKey
  readonly validationConfig: types.RaydiumValidationConfig

  static readonly discriminator = Buffer.from([
    155, 12, 170, 224, 30, 250, 204, 130,
  ])

  static readonly layout = borsh.struct([
    borsh.publicKey("tokenBridge"),
    borsh.publicKey("coreBridge"),
    borsh.publicKey("authority"),
    types.RaydiumValidationConfig.layout("validationConfig"),
  ])

  constructor(fields: ConfigFields) {
    this.tokenBridge = fields.tokenBridge
    this.coreBridge = fields.coreBridge
    this.authority = fields.authority
    this.validationConfig = new types.RaydiumValidationConfig({
      ...fields.validationConfig,
    })
  }

  static async fetch(
    c: Connection,
    address: PublicKey
  ): Promise<Config | 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<Config | 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): Config {
    if (!data.slice(0, 8).equals(Config.discriminator)) {
      throw new Error("invalid account discriminator")
    }

    const dec = Config.layout.decode(data.slice(8))

    return new Config({
      tokenBridge: dec.tokenBridge,
      coreBridge: dec.coreBridge,
      authority: dec.authority,
      validationConfig: types.RaydiumValidationConfig.fromDecoded(
        dec.validationConfig
      ),
    })
  }

  toJSON(): ConfigJSON {
    return {
      tokenBridge: this.tokenBridge.toString(),
      coreBridge: this.coreBridge.toString(),
      authority: this.authority.toString(),
      validationConfig: this.validationConfig.toJSON(),
    }
  }

  static fromJSON(obj: ConfigJSON): Config {
    return new Config({
      tokenBridge: new PublicKey(obj.tokenBridge),
      coreBridge: new PublicKey(obj.coreBridge),
      authority: new PublicKey(obj.authority),
      validationConfig: types.RaydiumValidationConfig.fromJSON(
        obj.validationConfig
      ),
    })
  }
}