import * as anchor from "@project-serum/anchor";
import {
  getAssociatedTokenAddress,
  getAccount,
  createAssociatedTokenAccountInstruction,
} from "@solana/spl-token";
import { getStrikr, getStrikrAuthority } from "../../utils";
import {
  TOKEN_METADATA_PROGRAM_ID,
  STRIKR_COLLECTION_MINT,
} from "../../constants";
import { requestComputeUnits } from "../../actions/request-compute-units";
import { getFloorOption } from "./get-floor-option";
import { Response } from "../../types/types";

/**
 * Exercise the put option
 * @param provider Anchor provider
 * @param optionKey Option key representing a unique option
 * @param assetNftMint Asset NFT which underlies the option
 * @param whitelistProof The Merkle proof of the NFT wrt the mint list tree
 * @param assetNftTokenAccount Optional: The token account of the user wrt the NFT
 * @returns Promise resolving to the transaction signature
 */
export const floorExercisePutOption = async (
  provider: anchor.AnchorProvider,
  optionKey: anchor.web3.PublicKey,
  assetNftMint: anchor.web3.PublicKey,
  whitelistProof: number[][],
  assetNftTokenAccount?: anchor.web3.PublicKey
): Promise<Response> => {
  const strikr = getStrikr(provider);
  const depositTransaction = new anchor.web3.Transaction();
  const exerciseTransaction = new anchor.web3.Transaction();

  const strikrAuthority = await getStrikrAuthority();
  const optionState = await getFloorOption(provider.connection, optionKey);

  // Request additional compute units and attach the instruction
  const computeUnitsIx = requestComputeUnits(provider, 400_000, 0);

  depositTransaction.add(computeUnitsIx);
  exerciseTransaction.add(computeUnitsIx);

  const strikrAssetNftTokenAccount = await getAssociatedTokenAddress(
    assetNftMint,
    strikrAuthority,
    true
  );

  const buyerPositionNftTokenAccount = await getAssociatedTokenAddress(
    optionState.buyerPositionNftMint,
    provider.wallet.publicKey,
    true
  );

  if (!optionState.isCollateralDeposited) {
    // Use wallet's ATA as the NFT token account if not passed as argument
    if (!assetNftTokenAccount) {
      assetNftTokenAccount = await getAssociatedTokenAddress(
        assetNftMint,
        provider.wallet.publicKey
      );
      // Check if ATA exists, otherwise initialize it
      try {
        await getAccount(provider.connection, assetNftTokenAccount);
      } catch {
        depositTransaction.add(
          createAssociatedTokenAccountInstruction(
            provider.wallet.publicKey,
            assetNftTokenAccount,
            provider.wallet.publicKey,
            assetNftMint
          )
        );
      }
    }

    depositTransaction.add(
      await strikr.methods
        .floorDepositAssetBeforeExercise(whitelistProof)
        .accounts({
          signer: provider.wallet.publicKey,
          optionKey: optionKey,
          collectionIdentifierKey: optionState.collectionIdentifierKey,
          assetNftMint: assetNftMint,
          strikrCollectionMint: STRIKR_COLLECTION_MINT,
          signerAssetNftTokenAccount: assetNftTokenAccount,
          strikrAssetNftTokenAccount: strikrAssetNftTokenAccount,
          tokenMetadataProgram: TOKEN_METADATA_PROGRAM_ID,
        })
        .instruction()
    );

    await provider.sendAndConfirm(depositTransaction);
  }

  exerciseTransaction.add(
    await strikr.methods
      .floorExercisePutOption()
      .accounts({
        signer: provider.wallet.publicKey,
        optionKey: optionKey,
        collectionIdentifierKey: optionState.collectionIdentifierKey,
        strikrCollectionMint: STRIKR_COLLECTION_MINT,
        buyerPositionNftMint: optionState.buyerPositionNftMint,
        buyerPositionNftTokenAccount: buyerPositionNftTokenAccount,
        tokenMetadataProgram: TOKEN_METADATA_PROGRAM_ID,
      })
      .instruction()
  );

  const signature = await provider.sendAndConfirm(exerciseTransaction);

  return {
    signature,
    optionKey: optionState.optionKey,
  };
};