import type {
  AccountMeta,
  Cluster,
  TransactionInstruction,
} from "@solana/web3.js";
import { PublicKey, Transaction } from "@solana/web3.js";

/**
 * Instruction that can be serialized to JSON.
 */
export interface SerializableInstruction {
  programId: string;
  keys: (Omit<AccountMeta, "pubkey"> & { publicKey: string })[];
  data: string;
}

/**
 * Stub of a recent blockhash that can be used to simulate transactions.
 */
export const RECENT_BLOCKHASH_STUB =
  "GfVcyD4kkTrj4bKc7WA9sZCin9JDbdT4Zkd3EittNR1W";

/**
 * Builds a transaction with a fake `recentBlockhash` and `feePayer` for the purpose
 * of simulating a sequence of instructions.
 *
 * @param cluster
 * @param ixs
 * @returns
 */
export const buildStubbedTransaction = (
  cluster: Cluster,
  ixs: TransactionInstruction[]
): Transaction => {
  const tx = new Transaction();
  tx.recentBlockhash = RECENT_BLOCKHASH_STUB;

  // random keys that always have money in them
  tx.feePayer =
    cluster === "devnet"
      ? new PublicKey("A2jaCHPzD6346348JoEym2KFGX9A7uRBw6AhCdX7gTWP")
      : new PublicKey("9u9iZBWqGsp5hXBxkVZtBTuLSGNAG9gEQLgpuVw39ASg");
  tx.instructions = ixs;
  return tx;
};

/**
 * Serializes a {@link Transaction} to base64 format without checking signatures.
 * @param tx
 * @returns
 */
export const serializeToBase64Unchecked = (tx: Transaction): string =>
  tx
    .serialize({
      requireAllSignatures: false,
      verifySignatures: false,
    })
    .toString("base64");

/**
 * Generates a link for inspecting the contents of a transaction.
 *
 * @returns URL
 */
export const generateInspectLinkFromBase64 = (
  cluster: Cluster,
  base64TX: string
): string => {
  return `https://${
    cluster === "mainnet-beta" ? "" : `${cluster}.`
  }anchor.so/tx/inspector?message=${encodeURIComponent(base64TX)}`;
};

/**
 * Generates a link for inspecting the contents of a transaction, not checking for
 * or requiring valid signatures.
 *
 * @returns URL
 */
export const generateUncheckedInspectLink = (
  cluster: Cluster,
  tx: Transaction
): string => {
  return generateInspectLinkFromBase64(cluster, serializeToBase64Unchecked(tx));
};