nft-metadata 1.1.0

use crate::{
    assertions::{
        collection::{
            assert_collection_update_is_valid, assert_collection_verify_is_valid,
            assert_has_collection_authority,
        },
        uses::process_use_authority_validation,
    },
    deprecated_processor::{
        process_deprecated_create_metadata_accounts, process_deprecated_update_metadata_accounts,
    },
    error::MetadataError,
    instruction::MetadataInstruction,
    state::{
        CollectionAuthorityRecord, DataV2, Key, MasterEditionV1, MasterEditionV2, Metadata,
        TokenStandard, UseAuthorityRecord, UseMethod, Uses, BURN, COLLECTION_AUTHORITY,
        COLLECTION_AUTHORITY_RECORD_SIZE, EDITION, MAX_MASTER_EDITION_LEN, PREFIX, USER,
        USE_AUTHORITY_RECORD_SIZE,
    },
    utils::{
        assert_currently_holding, assert_data_valid, assert_derivation, assert_initialized,
        assert_mint_authority_matches_mint, assert_owned_by, assert_signer,
        assert_token_program_matches_package, assert_update_authority_is_correct,
        create_or_allocate_account_raw, get_owner_from_token_account,
        process_create_metadata_accounts_logic,
        process_mint_new_edition_from_master_edition_via_token_logic, puff_out_data_fields,
        spl_token_burn, transfer_mint_authority, CreateMetadataAccountsLogicArgs,
        MintNewEditionFromMasterEditionViaTokenLogicArgs, TokenBurnParams,
    },
};
use arrayref::array_ref;
use borsh::{BorshDeserialize, BorshSerialize};
use mpl_token_vault::{error::VaultError, state::VaultState};
use solana_program::{
    account_info::{next_account_info, AccountInfo},
    entrypoint::ProgramResult,
    msg,
    program::invoke,
    program_error::ProgramError,
    pubkey::Pubkey,
};
use spl_token::{
    instruction::{approve, revoke},
    state::{Account, Mint},
};

pub fn process_instruction<'a>(
    program_id: &'a Pubkey,
    accounts: &'a [AccountInfo<'a>],
    input: &[u8],
) -> ProgramResult {
    let instruction = MetadataInstruction::try_from_slice(input)?;
    match instruction {
        MetadataInstruction::CreateMetadataAccount(args) => {
            msg!("(Deprecated as of 1.1.0) Instruction: Create Metadata Accounts");
            process_deprecated_create_metadata_accounts(
                program_id,
                accounts,
                args.data,
                false,
                args.is_mutable,
            )
        }
        MetadataInstruction::UpdateMetadataAccount(args) => {
            msg!("(Deprecated as of 1.1.0) Instruction: Update Metadata Accounts");
            process_deprecated_update_metadata_accounts(
                program_id,
                accounts,
                args.data,
                args.update_authority,
                args.primary_sale_happened,
            )
        }
        MetadataInstruction::CreateMetadataAccountV2(args) => {
            msg!("Instruction: Create Metadata Accounts v2");
            process_create_metadata_accounts_v2(
                program_id,
                accounts,
                args.data,
                false,
                args.is_mutable,
            )
        }
        MetadataInstruction::UpdateMetadataAccountV2(args) => {
            msg!("Instruction: Update Metadata Accounts v2");
            process_update_metadata_accounts_v2(
                program_id,
                accounts,
                args.data,
                args.update_authority,
                args.primary_sale_happened,
                args.is_mutable,
            )
        }
        MetadataInstruction::DeprecatedCreateMasterEdition(_args) => {
            msg!("Instruction: Deprecated Create Master Edition, Removed in 1.1.0");
            Err(MetadataError::Removed.into())
        }
        MetadataInstruction::DeprecatedMintNewEditionFromMasterEditionViaPrintingToken => {
            msg!("Instruction: Deprecated Mint New Edition from Master Edition Via Token, Removed in 1.1.0");
            Err(MetadataError::Removed.into())
        }
        MetadataInstruction::UpdatePrimarySaleHappenedViaToken => {
            msg!("Instruction: Update primary sale via token");
            process_update_primary_sale_happened_via_token(program_id, accounts)
        }
        MetadataInstruction::DeprecatedSetReservationList(_args) => {
            msg!("Instruction: Deprecated Set Reservation List, Removed in 1.1.0");
            Err(MetadataError::Removed.into())
        }
        MetadataInstruction::DeprecatedCreateReservationList => {
            msg!("Instruction: Deprecated Create Reservation List, Removed in 1.1.0");
            Err(MetadataError::Removed.into())
        }
        MetadataInstruction::SignMetadata => {
            msg!("Instruction: Sign Metadata");
            process_sign_metadata(program_id, accounts)
        }
        MetadataInstruction::DeprecatedMintPrintingTokensViaToken(_args) => {
            msg!("Instruction: Deprecated Mint Printing Tokens Via Token, Removed in 1.1.0");
            Err(MetadataError::Removed.into())
        }
        MetadataInstruction::DeprecatedMintPrintingTokens(_args) => {
            msg!("Instruction: Deprecated Mint Printing Tokens, Removed in 1.1.0");
            Err(MetadataError::Removed.into())
        }
        MetadataInstruction::CreateMasterEdition(args) => {
            msg!("(Deprecated as of 1.1.0, please use V3 Create Master Edition)\n V2 Create Master Edition");
            process_create_master_edition(program_id, accounts, args.max_supply)
        }
        MetadataInstruction::CreateMasterEditionV3(args) => {
            msg!("V3 Create Master Edition");
            process_create_master_edition(program_id, accounts, args.max_supply)
        }
        MetadataInstruction::MintNewEditionFromMasterEditionViaToken(args) => {
            msg!("Instruction: Mint New Edition from Master Edition Via Token");
            process_mint_new_edition_from_master_edition_via_token(
                program_id,
                accounts,
                args.edition,
                false,
            )
        }
        MetadataInstruction::ConvertMasterEditionV1ToV2 => {
            msg!("Instruction: Convert Master Edition V1 to V2");
            process_convert_master_edition_v1_to_v2(program_id, accounts)
        }
        MetadataInstruction::MintNewEditionFromMasterEditionViaVaultProxy(args) => {
            msg!("Instruction: Mint New Edition from Master Edition Via Vault Proxy");
            process_mint_new_edition_from_master_edition_via_vault_proxy(
                program_id,
                accounts,
                args.edition,
            )
        }
        MetadataInstruction::PuffMetadata => {
            msg!("Instruction: Puff Metadata");
            process_puff_metadata_account(program_id, accounts)
        }
        MetadataInstruction::VerifyCollection => {
            msg!("Instruction: Verify Collection");
            verify_collection(program_id, accounts)
        }
        MetadataInstruction::UnverifyCollection => {
            msg!("Instruction: Unverify Collection");
            unverify_collection(program_id, accounts)
        }
        MetadataInstruction::Utilize(args) => {
            msg!("Instruction: Use/Utilize Token");
            process_utilize(program_id, accounts, args.number_of_uses)
        }
        MetadataInstruction::ApproveUseAuthority(args) => {
            msg!("Instruction: Approve Use Authority");
            process_approve_use_authority(program_id, accounts, args.number_of_uses)
        }
        MetadataInstruction::RevokeUseAuthority => {
            msg!("Instruction: Revoke Use Authority");
            process_revoke_use_authority(program_id, accounts)
        }
        MetadataInstruction::ApproveCollectionAuthority => {
            msg!("Instruction: Approve Collection Authority");
            process_approve_collection_authority(program_id, accounts)
        }
        MetadataInstruction::RevokeCollectionAuthority => {
            msg!("Instruction: Revoke Collection Authority");
            process_revoke_collection_authority(program_id, accounts)
        }
    }
}

pub fn process_create_metadata_accounts_v2<'a>(
    program_id: &'a Pubkey,
    accounts: &'a [AccountInfo<'a>],
    data: DataV2,
    allow_direct_creator_writes: bool,
    is_mutable: bool,
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let metadata_account_info = next_account_info(account_info_iter)?;
    let mint_info = next_account_info(account_info_iter)?;
    let mint_authority_info = next_account_info(account_info_iter)?;
    let payer_account_info = next_account_info(account_info_iter)?;
    let update_authority_info = next_account_info(account_info_iter)?;
    let system_account_info = next_account_info(account_info_iter)?;
    let rent_info = next_account_info(account_info_iter)?;

    process_create_metadata_accounts_logic(
        &program_id,
        CreateMetadataAccountsLogicArgs {
            metadata_account_info,
            mint_info,
            mint_authority_info,
            payer_account_info,
            update_authority_info,
            system_account_info,
            rent_info,
        },
        data,
        allow_direct_creator_writes,
        is_mutable,
        false,
        true,
    )
}

// Update existing account instruction
pub fn process_update_metadata_accounts_v2(
    program_id: &Pubkey,
    accounts: &[AccountInfo],
    optional_data: Option<DataV2>,
    update_authority: Option<Pubkey>,
    primary_sale_happened: Option<bool>,
    is_mutable: Option<bool>,
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();

    let metadata_account_info = next_account_info(account_info_iter)?;
    let update_authority_info = next_account_info(account_info_iter)?;
    let mut metadata = Metadata::from_account_info(metadata_account_info)?;

    assert_owned_by(metadata_account_info, program_id)?;
    assert_update_authority_is_correct(&metadata, update_authority_info)?;

    if let Some(data) = optional_data {
        if metadata.is_mutable {
            let compatible_data = data.to_v1();
            assert_data_valid(
                &compatible_data,
                update_authority_info.key,
                &metadata,
                false,
                update_authority_info.is_signer,
                true,
            )?;
            metadata.data = compatible_data;
            assert_collection_update_is_valid(&metadata.collection, &data.collection)?;
            metadata.collection = data.collection;
        } else {
            return Err(MetadataError::DataIsImmutable.into());
        }
    }

    if let Some(val) = update_authority {
        metadata.update_authority = val;
    }

    if let Some(val) = primary_sale_happened {
        if val {
            metadata.primary_sale_happened = val
        } else {
            return Err(MetadataError::PrimarySaleCanOnlyBeFlippedToTrue.into());
        }
    }

    if let Some(val) = is_mutable {
        if !val {
            metadata.is_mutable = val
        } else {
            return Err(MetadataError::IsMutableCanOnlyBeFlippedToFalse.into());
        }
    }

    puff_out_data_fields(&mut metadata);

    metadata.serialize(&mut *metadata_account_info.data.borrow_mut())?;
    Ok(())
}
pub fn process_update_primary_sale_happened_via_token(
    program_id: &Pubkey,
    accounts: &[AccountInfo],
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();

    let metadata_account_info = next_account_info(account_info_iter)?;
    let owner_info = next_account_info(account_info_iter)?;
    let token_account_info = next_account_info(account_info_iter)?;

    let token_account: Account = assert_initialized(token_account_info)?;
    let mut metadata = Metadata::from_account_info(metadata_account_info)?;

    assert_owned_by(metadata_account_info, program_id)?;
    assert_owned_by(token_account_info, &spl_token::id())?;

    if !owner_info.is_signer {
        return Err(ProgramError::MissingRequiredSignature);
    }

    if token_account.owner != *owner_info.key {
        return Err(MetadataError::OwnerMismatch.into());
    }

    if token_account.amount == 0 {
        return Err(MetadataError::NoBalanceInAccountForAuthorization.into());
    }

    if token_account.mint != metadata.mint {
        return Err(MetadataError::MintMismatch.into());
    }

    metadata.primary_sale_happened = true;
    metadata.serialize(&mut *metadata_account_info.data.borrow_mut())?;

    Ok(())
}

pub fn process_sign_metadata(program_id: &Pubkey, accounts: &[AccountInfo]) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();

    let metadata_info = next_account_info(account_info_iter)?;
    let creator_info = next_account_info(account_info_iter)?;

    assert_signer(creator_info)?;
    assert_owned_by(metadata_info, program_id)?;

    let mut metadata = Metadata::from_account_info(metadata_info)?;

    if let Some(creators) = &mut metadata.data.creators {
        let mut found = false;
        for creator in creators {
            if creator.address == *creator_info.key {
                creator.verified = true;
                found = true;
                break;
            }
        }
        if !found {
            return Err(MetadataError::CreatorNotFound.into());
        }
    } else {
        return Err(MetadataError::NoCreatorsPresentOnMetadata.into());
    }
    metadata.serialize(&mut *metadata_info.data.borrow_mut())?;

    Ok(())
}

/// Create master edition
pub fn process_create_master_edition(
    program_id: &Pubkey,
    accounts: &[AccountInfo],
    max_supply: Option<u64>,
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();

    let edition_account_info = next_account_info(account_info_iter)?;
    let mint_info = next_account_info(account_info_iter)?;
    let update_authority_info = next_account_info(account_info_iter)?;
    let mint_authority_info = next_account_info(account_info_iter)?;
    let payer_account_info = next_account_info(account_info_iter)?;
    let metadata_account_info = next_account_info(account_info_iter)?;
    let token_program_info = next_account_info(account_info_iter)?;
    let system_account_info = next_account_info(account_info_iter)?;
    let rent_info = next_account_info(account_info_iter)?;

    let metadata = Metadata::from_account_info(metadata_account_info)?;
    let mint: Mint = assert_initialized(mint_info)?;

    let bump_seed = assert_derivation(
        program_id,
        edition_account_info,
        &[
            PREFIX.as_bytes(),
            program_id.as_ref(),
            &mint_info.key.as_ref(),
            EDITION.as_bytes(),
        ],
    )?;

    assert_token_program_matches_package(token_program_info)?;
    assert_mint_authority_matches_mint(&mint.mint_authority, mint_authority_info)?;
    assert_owned_by(metadata_account_info, program_id)?;
    assert_owned_by(mint_info, &spl_token::id())?;

    if metadata.mint != *mint_info.key {
        return Err(MetadataError::MintMismatch.into());
    }

    if mint.decimals != 0 {
        return Err(MetadataError::EditionMintDecimalsShouldBeZero.into());
    }

    assert_update_authority_is_correct(&metadata, update_authority_info)?;

    if mint.supply != 1 {
        return Err(MetadataError::EditionsMustHaveExactlyOneToken.into());
    }

    let edition_authority_seeds = &[
        PREFIX.as_bytes(),
        program_id.as_ref(),
        &mint_info.key.as_ref(),
        EDITION.as_bytes(),
        &[bump_seed],
    ];

    create_or_allocate_account_raw(
        *program_id,
        edition_account_info,
        rent_info,
        system_account_info,
        payer_account_info,
        MAX_MASTER_EDITION_LEN,
        edition_authority_seeds,
    )?;

    let mut edition = MasterEditionV2::from_account_info(edition_account_info)?;

    edition.key = Key::MasterEditionV2;
    edition.supply = 0;
    edition.max_supply = max_supply;
    edition.serialize(&mut *edition_account_info.data.borrow_mut())?;
    if metadata_account_info.is_writable {
        let mut metadata_mut = Metadata::from_account_info(metadata_account_info)?;
        metadata_mut.token_standard = Some(TokenStandard::NonFungible);
        metadata_mut.serialize(&mut *metadata_account_info.data.borrow_mut())?;
    }

    // While you can't mint any more of your master record, you can
    // mint as many limited editions as you like within your max supply.
    transfer_mint_authority(
        edition_account_info.key,
        edition_account_info,
        mint_info,
        mint_authority_info,
        token_program_info,
    )?;

    Ok(())
}

pub fn process_mint_new_edition_from_master_edition_via_token<'a>(
    program_id: &'a Pubkey,
    accounts: &'a [AccountInfo<'a>],
    edition: u64,
    ignore_owner_signer: bool,
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();

    let new_metadata_account_info = next_account_info(account_info_iter)?;
    let new_edition_account_info = next_account_info(account_info_iter)?;
    let master_edition_account_info = next_account_info(account_info_iter)?;
    let mint_info = next_account_info(account_info_iter)?;
    let edition_marker_info = next_account_info(account_info_iter)?;
    let mint_authority_info = next_account_info(account_info_iter)?;
    let payer_account_info = next_account_info(account_info_iter)?;
    let owner_account_info = next_account_info(account_info_iter)?;
    let token_account_info = next_account_info(account_info_iter)?;
    let update_authority_info = next_account_info(account_info_iter)?;
    let master_metadata_account_info = next_account_info(account_info_iter)?;
    let token_program_account_info = next_account_info(account_info_iter)?;
    let system_account_info = next_account_info(account_info_iter)?;
    let rent_info = next_account_info(account_info_iter)?;

    process_mint_new_edition_from_master_edition_via_token_logic(
        &program_id,
        MintNewEditionFromMasterEditionViaTokenLogicArgs {
            new_metadata_account_info,
            new_edition_account_info,
            master_edition_account_info,
            mint_info,
            edition_marker_info,
            mint_authority_info,
            payer_account_info,
            owner_account_info,
            token_account_info,
            update_authority_info,
            master_metadata_account_info,
            token_program_account_info,
            system_account_info,
            rent_info,
        },
        edition,
        ignore_owner_signer,
    )
}

pub fn process_convert_master_edition_v1_to_v2(
    program_id: &Pubkey,
    accounts: &[AccountInfo],
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let master_edition_info = next_account_info(account_info_iter)?;
    let one_time_printing_auth_mint_info = next_account_info(account_info_iter)?;
    let printing_mint_info = next_account_info(account_info_iter)?;

    assert_owned_by(master_edition_info, program_id)?;
    assert_owned_by(one_time_printing_auth_mint_info, &spl_token::id())?;
    assert_owned_by(printing_mint_info, &spl_token::id())?;
    let master_edition: MasterEditionV1 = MasterEditionV1::from_account_info(master_edition_info)?;
    let printing_mint: Mint = assert_initialized(printing_mint_info)?;
    let auth_mint: Mint = assert_initialized(one_time_printing_auth_mint_info)?;
    if master_edition.one_time_printing_authorization_mint != *one_time_printing_auth_mint_info.key
    {
        return Err(MetadataError::OneTimePrintingAuthMintMismatch.into());
    }

    if master_edition.printing_mint != *printing_mint_info.key {
        return Err(MetadataError::PrintingMintMismatch.into());
    }

    if printing_mint.supply != 0 {
        return Err(MetadataError::PrintingMintSupplyMustBeZeroForConversion.into());
    }

    if auth_mint.supply != 0 {
        return Err(MetadataError::OneTimeAuthMintSupplyMustBeZeroForConversion.into());
    }

    MasterEditionV2 {
        key: Key::MasterEditionV2,
        supply: master_edition.supply,
        max_supply: master_edition.max_supply,
    }
    .serialize(&mut *master_edition_info.data.borrow_mut())?;

    Ok(())
}

pub fn process_mint_new_edition_from_master_edition_via_vault_proxy<'a>(
    program_id: &'a Pubkey,
    accounts: &'a [AccountInfo<'a>],
    edition: u64,
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();

    let new_metadata_account_info = next_account_info(account_info_iter)?;
    let new_edition_account_info = next_account_info(account_info_iter)?;
    let master_edition_account_info = next_account_info(account_info_iter)?;
    let mint_info = next_account_info(account_info_iter)?;
    let edition_marker_info = next_account_info(account_info_iter)?;
    let mint_authority_info = next_account_info(account_info_iter)?;
    let payer_info = next_account_info(account_info_iter)?;
    let vault_authority_info = next_account_info(account_info_iter)?;
    let store_info = next_account_info(account_info_iter)?;
    let safety_deposit_info = next_account_info(account_info_iter)?;
    let vault_info = next_account_info(account_info_iter)?;
    let update_authority_info = next_account_info(account_info_iter)?;
    let master_metadata_account_info = next_account_info(account_info_iter)?;
    let token_program_account_info = next_account_info(account_info_iter)?;
    // we cant do much here to prove that this is the right token vault program except to prove that it matches
    // the global one right now. We dont want to force people to use one vault program,
    // so there is a bit of trust involved, but the attack vector here is someone provides
    // an entirely fake vault program that claims to own token account X via it's pda but in order to spoof X's owner
    // and get a free edition. However, we check that the owner of account X is the vault account's pda, so
    // not sure how they would get away with it - they'd need to actually own that account! - J.
    let token_vault_program_info = next_account_info(account_info_iter)?;
    let system_account_info = next_account_info(account_info_iter)?;
    let rent_info = next_account_info(account_info_iter)?;

    let vault_data = vault_info.data.borrow();
    let safety_deposit_data = safety_deposit_info.data.borrow();

    // Since we're crunching out borsh for CPU units, do type checks this way
    if vault_data[0] != mpl_token_vault::state::Key::VaultV1 as u8 {
        return Err(VaultError::DataTypeMismatch.into());
    }

    if safety_deposit_data[0] != mpl_token_vault::state::Key::SafetyDepositBoxV1 as u8 {
        return Err(VaultError::DataTypeMismatch.into());
    }

    // skip deserialization to keep things cheap on CPU
    let token_program = Pubkey::new_from_array(*array_ref![vault_data, 1, 32]);
    let vault_authority = Pubkey::new_from_array(*array_ref![vault_data, 65, 32]);
    let store_on_sd = Pubkey::new_from_array(*array_ref![safety_deposit_data, 65, 32]);
    let vault_on_sd = Pubkey::new_from_array(*array_ref![safety_deposit_data, 1, 32]);

    let owner = get_owner_from_token_account(store_info)?;

    let seeds = &[
        mpl_token_vault::state::PREFIX.as_bytes(),
        token_vault_program_info.key.as_ref(),
        vault_info.key.as_ref(),
    ];
    let (authority, _) = Pubkey::find_program_address(seeds, token_vault_program_info.key);

    if owner != authority {
        return Err(MetadataError::InvalidOwner.into());
    }

    assert_signer(vault_authority_info)?;

    // Since most checks happen next level down in token program, we only need to verify
    // that the vault authority signer matches what's expected on vault to authorize
    // use of our pda authority, and that the token store is right for the safety deposit.
    // Then pass it through.
    assert_owned_by(vault_info, token_vault_program_info.key)?;
    assert_owned_by(safety_deposit_info, token_vault_program_info.key)?;
    assert_owned_by(store_info, token_program_account_info.key)?;

    if &token_program != token_program_account_info.key {
        return Err(VaultError::TokenProgramProvidedDoesNotMatchVault.into());
    }

    if !vault_authority_info.is_signer {
        return Err(VaultError::AuthorityIsNotSigner.into());
    }
    if *vault_authority_info.key != vault_authority {
        return Err(VaultError::AuthorityDoesNotMatch.into());
    }

    if vault_data[195] != VaultState::Combined as u8 {
        return Err(VaultError::VaultShouldBeCombined.into());
    }

    if vault_on_sd != *vault_info.key {
        return Err(VaultError::SafetyDepositBoxVaultMismatch.into());
    }

    if *store_info.key != store_on_sd {
        return Err(VaultError::StoreDoesNotMatchSafetyDepositBox.into());
    }

    let args = MintNewEditionFromMasterEditionViaTokenLogicArgs {
        new_metadata_account_info,
        new_edition_account_info,
        master_edition_account_info,
        mint_info,
        edition_marker_info,
        mint_authority_info,
        payer_account_info: payer_info,
        owner_account_info: vault_authority_info,
        token_account_info: store_info,
        update_authority_info,
        master_metadata_account_info,
        token_program_account_info,
        system_account_info,
        rent_info,
    };

    process_mint_new_edition_from_master_edition_via_token_logic(program_id, args, edition, true)
}

/// Puff out the variable length fields to a fixed length on a metadata
/// account in a permissionless way.
pub fn process_puff_metadata_account(
    program_id: &Pubkey,
    accounts: &[AccountInfo],
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();

    let metadata_account_info = next_account_info(account_info_iter)?;
    let mut metadata = Metadata::from_account_info(metadata_account_info)?;

    assert_owned_by(metadata_account_info, program_id)?;

    puff_out_data_fields(&mut metadata);

    let edition_seeds = &[
        PREFIX.as_bytes(),
        program_id.as_ref(),
        metadata.mint.as_ref(),
        EDITION.as_bytes(),
    ];
    let (_, edition_bump_seed) = Pubkey::find_program_address(edition_seeds, program_id);
    metadata.edition_nonce = Some(edition_bump_seed);

    metadata.serialize(&mut *metadata_account_info.data.borrow_mut())?;
    Ok(())
}

pub fn verify_collection(program_id: &Pubkey, accounts: &[AccountInfo]) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let metadata_info = next_account_info(account_info_iter)?;
    let collection_authority_info = next_account_info(account_info_iter)?;
    let payer_info = next_account_info(account_info_iter)?;
    let collection_mint = next_account_info(account_info_iter)?;
    let collection_info = next_account_info(account_info_iter)?;
    let edition_account_info = next_account_info(account_info_iter)?;
    let using_delegated_collection_authority = accounts.len() == 7;
    assert_signer(collection_authority_info)?;
    assert_signer(payer_info)?;

    assert_owned_by(metadata_info, program_id)?;
    assert_owned_by(collection_info, program_id)?;
    assert_owned_by(collection_mint, &spl_token::id())?;
    assert_owned_by(edition_account_info, program_id)?;

    let mut metadata = Metadata::from_account_info(metadata_info)?;
    let collection_data = Metadata::from_account_info(collection_info)?;
    assert_collection_verify_is_valid(
        &metadata,
        &collection_data,
        collection_mint,
        edition_account_info,
    )?;
    if using_delegated_collection_authority {
        let collection_authority_record = next_account_info(account_info_iter)?;
        assert_has_collection_authority(
            collection_authority_info,
            &collection_data,
            collection_mint.key,
            Some(collection_authority_record),
        )?;
    } else {
        assert_has_collection_authority(
            collection_authority_info,
            &collection_data,
            collection_mint.key,
            None,
        )?;
    }
    if let Some(collection) = &mut metadata.collection {
        collection.verified = true;
    }
    metadata.serialize(&mut *metadata_info.data.borrow_mut())?;
    Ok(())
}

pub fn unverify_collection(program_id: &Pubkey, accounts: &[AccountInfo]) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let metadata_info = next_account_info(account_info_iter)?;
    let collection_authority_info = next_account_info(account_info_iter)?;
    let collection_mint = next_account_info(account_info_iter)?;
    let collection_info = next_account_info(account_info_iter)?;
    let edition_account_info = next_account_info(account_info_iter)?;
    let using_delegated_collection_authority = accounts.len() == 6;

    assert_signer(collection_authority_info)?;
    assert_owned_by(metadata_info, program_id)?;
    assert_owned_by(collection_info, program_id)?;
    assert_owned_by(collection_mint, &spl_token::id())?;
    assert_owned_by(edition_account_info, program_id)?;

    let mut metadata = Metadata::from_account_info(metadata_info)?;
    let collection_data = Metadata::from_account_info(collection_info)?;
    assert_collection_verify_is_valid(
        &metadata,
        &collection_data,
        collection_mint,
        edition_account_info,
    )?;
    if using_delegated_collection_authority {
        let collection_authority_record = next_account_info(account_info_iter)?;
        assert_has_collection_authority(
            collection_authority_info,
            &collection_data,
            collection_mint.key,
            Some(collection_authority_record),
        )?;
    } else {
        assert_has_collection_authority(
            collection_authority_info,
            &collection_data,
            collection_mint.key,
            None,
        )?;
    }
    if let Some(collection) = &mut metadata.collection {
        collection.verified = false;
    }
    metadata.serialize(&mut *metadata_info.data.borrow_mut())?;
    Ok(())
}

pub fn process_approve_use_authority(
    program_id: &Pubkey,
    accounts: &[AccountInfo],
    number_of_uses: u64,
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let use_authority_record_info = next_account_info(account_info_iter)?;
    let owner_info = next_account_info(account_info_iter)?;
    let payer = next_account_info(account_info_iter)?;
    let user_info = next_account_info(account_info_iter)?;
    let token_account_info = next_account_info(account_info_iter)?;
    let metadata_info = next_account_info(account_info_iter)?;
    let mint_info = next_account_info(account_info_iter)?;
    let program_as_burner = next_account_info(account_info_iter)?;
    let token_program_account_info = next_account_info(account_info_iter)?;
    let system_account_info = next_account_info(account_info_iter)?;
    let rent_info = next_account_info(account_info_iter)?;
    let metadata = Metadata::from_account_info(metadata_info)?;
    if metadata.uses.is_none() {
        return Err(MetadataError::Unusable.into());
    }
    if *token_program_account_info.key != spl_token::id() {
        return Err(MetadataError::InvalidTokenProgram.into());
    }
    assert_signer(&owner_info)?;
    assert_signer(&payer)?;
    assert_currently_holding(
        program_id,
        owner_info,
        metadata_info,
        &metadata,
        mint_info,
        token_account_info,
    )?;

    let bump_seed = process_use_authority_validation(
        program_id,
        use_authority_record_info,
        user_info,
        mint_info,
        true,
    )?;

    let metadata_uses = metadata.uses.unwrap();
    let use_authority_seeds = &[
        PREFIX.as_bytes(),
        program_id.as_ref(),
        &mint_info.key.as_ref(),
        USER.as_bytes(),
        &user_info.key.as_ref(),
        &[bump_seed],
    ];

    create_or_allocate_account_raw(
        *program_id,
        use_authority_record_info,
        rent_info,
        system_account_info,
        payer,
        USE_AUTHORITY_RECORD_SIZE,
        use_authority_seeds,
    )?;
    if number_of_uses > metadata_uses.remaining {
        return Err(MetadataError::NotEnoughUses.into());
    }
    if metadata_uses.use_method == UseMethod::Burn {
        invoke(
            &approve(
                &token_program_account_info.key,
                &token_account_info.key,
                &program_as_burner.key,
                &owner_info.key,
                &[],
                1,
            )
            .unwrap(),
            &[
                token_program_account_info.clone(),
                token_account_info.clone(),
                program_as_burner.clone(),
                owner_info.clone(),
            ],
        )?;
    }
    let mut record = UseAuthorityRecord::from_account_info(use_authority_record_info)?;
    record.key = Key::UseAuthorityRecord;
    record.allowed_uses = number_of_uses;
    record.serialize(&mut *use_authority_record_info.data.borrow_mut())?;
    Ok(())
}

pub fn process_revoke_use_authority(
    program_id: &Pubkey,
    accounts: &[AccountInfo],
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let use_authority_record_info = next_account_info(account_info_iter)?;
    let owner_info = next_account_info(account_info_iter)?;
    let user_info = next_account_info(account_info_iter)?;
    let token_account_info = next_account_info(account_info_iter)?;
    let mint_info = next_account_info(account_info_iter)?;
    let metadata_info = next_account_info(account_info_iter)?;
    let token_program_account_info = next_account_info(account_info_iter)?;
    let metadata = Metadata::from_account_info(metadata_info)?;
    if metadata.uses.is_none() {
        return Err(MetadataError::Unusable.into());
    }
    if *token_program_account_info.key != spl_token::id() {
        return Err(MetadataError::InvalidTokenProgram.into());
    }
    assert_signer(&owner_info)?;
    assert_currently_holding(
        program_id,
        owner_info,
        metadata_info,
        &metadata,
        mint_info,
        token_account_info,
    )?;
    process_use_authority_validation(
        program_id,
        use_authority_record_info,
        user_info,
        mint_info,
        false,
    )?;
    let metadata_uses = metadata.uses.unwrap();
    if metadata_uses.use_method == UseMethod::Burn {
        invoke(
            &revoke(
                &token_program_account_info.key,
                &token_account_info.key,
                &owner_info.key,
                &[],
            )
            .unwrap(),
            &[
                token_program_account_info.clone(),
                token_account_info.clone(),
                owner_info.clone(),
            ],
        )?;
    }
    let lamports = use_authority_record_info.lamports();
    **use_authority_record_info.lamports.borrow_mut() = 0;
    **owner_info.lamports.borrow_mut() = owner_info
        .lamports()
        .checked_add(lamports)
        .ok_or(MetadataError::NumericalOverflowError)?;
    let mut data = use_authority_record_info.try_borrow_mut_data()?;
    data[0] = 0;

    Ok(())
}

pub fn process_utilize(
    program_id: &Pubkey,
    accounts: &[AccountInfo],
    number_of_uses: u64,
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let metadata_info = next_account_info(account_info_iter)?;
    let token_account_info = next_account_info(account_info_iter)?;
    let mint_info = next_account_info(account_info_iter)?;
    let user_info = next_account_info(account_info_iter)?;
    let owner_info = next_account_info(account_info_iter)?;
    let token_program_account_info = next_account_info(account_info_iter)?;
    let _ata_program_account_info = next_account_info(account_info_iter)?;
    let _system_account_info = next_account_info(account_info_iter)?;
    let _rent_info = next_account_info(account_info_iter)?;
    let metadata = Metadata::from_account_info(metadata_info)?;
    let approved_authority_is_using = accounts.len() == 11;
    if metadata.uses.is_none() {
        return Err(MetadataError::Unusable.into());
    }
    if *token_program_account_info.key != spl_token::id() {
        return Err(MetadataError::InvalidTokenProgram.into());
    }

    assert_signer(&user_info)?;
    assert_currently_holding(
        program_id,
        owner_info,
        metadata_info,
        &metadata,
        mint_info,
        token_account_info,
    )?;
    let mut metadata = Metadata::from_account_info(metadata_info)?;
    let metadata_uses = metadata.uses.unwrap();
    let must_burn = metadata_uses.use_method == UseMethod::Burn;
    if number_of_uses > metadata_uses.total || number_of_uses > metadata_uses.remaining {
        return Err(MetadataError::NotEnoughUses.into());
    }
    let remaining_uses = metadata_uses
        .remaining
        .checked_sub(number_of_uses)
        .ok_or(MetadataError::NotEnoughUses)?;
    metadata.uses = Some(Uses {
        use_method: metadata_uses.use_method,
        total: metadata_uses.total,
        remaining: remaining_uses,
    });
    if approved_authority_is_using {
        let use_authority_record_info = next_account_info(account_info_iter)?;
        process_use_authority_validation(
            program_id,
            use_authority_record_info,
            user_info,
            mint_info,
            false,
        )?;
        assert_owned_by(use_authority_record_info, program_id)?;
        let mut record = UseAuthorityRecord::from_account_info(use_authority_record_info)?;
        record.allowed_uses = record
            .allowed_uses
            .checked_sub(number_of_uses)
            .ok_or(MetadataError::NotEnoughUses)?;
        record.serialize(&mut *use_authority_record_info.data.borrow_mut())?;
    }
    metadata.serialize(&mut *metadata_info.data.borrow_mut())?;
    if remaining_uses <= 0 && must_burn {
        if approved_authority_is_using {
            let burn_path = &[PREFIX.as_bytes(), program_id.as_ref(), BURN.as_bytes()];
            let burn_authority_info = next_account_info(account_info_iter)?;
            let burn_bump_ref = &[
                PREFIX.as_bytes(),
                program_id.as_ref(),
                BURN.as_bytes(),
                &[assert_derivation(
                    &program_id,
                    burn_authority_info,
                    burn_path,
                )?],
            ];
            spl_token_burn(TokenBurnParams {
                mint: mint_info.clone(),
                amount: 1,
                authority: burn_authority_info.clone(),
                token_program: token_program_account_info.clone(),
                source: token_account_info.clone(),
                authority_signer_seeds: Some(burn_bump_ref),
            })?;
        } else {
            spl_token_burn(TokenBurnParams {
                mint: mint_info.clone(),
                amount: 1,
                authority: owner_info.clone(),
                token_program: token_program_account_info.clone(),
                source: token_account_info.clone(),
                authority_signer_seeds: None,
            })?;
        }
    }
    Ok(())
}

pub fn process_approve_collection_authority(
    program_id: &Pubkey,
    accounts: &[AccountInfo],
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let collection_authority_record = next_account_info(account_info_iter)?;
    let new_collection_authority = next_account_info(account_info_iter)?;
    let update_authority = next_account_info(account_info_iter)?;
    let payer = next_account_info(account_info_iter)?;
    let metadata_info = next_account_info(account_info_iter)?;
    let mint_info = next_account_info(account_info_iter)?;
    let system_account_info = next_account_info(account_info_iter)?;
    let rent_info = next_account_info(account_info_iter)?;

    let metadata = Metadata::from_account_info(metadata_info)?;
    assert_owned_by(metadata_info, program_id)?;
    assert_owned_by(mint_info, &spl_token::id())?;
    assert_signer(&update_authority)?;
    assert_signer(&payer)?;
    if metadata.update_authority != *update_authority.key {
        return Err(MetadataError::UpdateAuthorityIncorrect.into());
    }
    if metadata.mint != *mint_info.key {
        return Err(MetadataError::MintMismatch.into());
    }
    let collection_authority_info_empty = collection_authority_record.try_data_is_empty()?;
    if !collection_authority_info_empty {
        return Err(MetadataError::CollectionAuthorityRecordAlreadyExists.into());
    }
    let collection_authority_path = Vec::from([
        PREFIX.as_bytes(),
        program_id.as_ref(),
        &mint_info.key.as_ref(),
        COLLECTION_AUTHORITY.as_bytes(),
        &new_collection_authority.key.as_ref(),
    ]);
    let collection_authority_bump_seed = &[assert_derivation(
        program_id,
        collection_authority_record,
        &collection_authority_path,
    )?];
    let mut collection_authority_seeds = collection_authority_path.clone();
    collection_authority_seeds.push(collection_authority_bump_seed);
    create_or_allocate_account_raw(
        *program_id,
        collection_authority_record,
        rent_info,
        system_account_info,
        payer,
        COLLECTION_AUTHORITY_RECORD_SIZE,
        &collection_authority_seeds,
    )?;

    let mut record = CollectionAuthorityRecord::from_account_info(collection_authority_record)?;
    record.key = Key::CollectionAuthorityRecord;
    record.serialize(&mut *collection_authority_record.data.borrow_mut())?;
    Ok(())
}

pub fn process_revoke_collection_authority(
    program_id: &Pubkey,
    accounts: &[AccountInfo],
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let collection_authority_record = next_account_info(account_info_iter)?;
    let new_collection_authority = next_account_info(account_info_iter)?;
    let update_authority = next_account_info(account_info_iter)?;
    let metadata_info = next_account_info(account_info_iter)?;
    let mint_info = next_account_info(account_info_iter)?;
    let metadata = Metadata::from_account_info(metadata_info)?;
    assert_owned_by(metadata_info, program_id)?;
    assert_owned_by(mint_info, &spl_token::id())?;
    assert_signer(&update_authority)?;
    if metadata.update_authority != *update_authority.key {
        return Err(MetadataError::UpdateAuthorityIncorrect.into());
    }
    if metadata.mint != *mint_info.key {
        return Err(MetadataError::MintMismatch.into());
    }
    let collection_authority_info_empty = collection_authority_record.try_data_is_empty()?;
    if collection_authority_info_empty {
        return Err(MetadataError::CollectionAuthorityDoesNotExist.into());
    }
    assert_has_collection_authority(
        new_collection_authority,
        &metadata,
        &mint_info.key,
        Some(collection_authority_record),
    )?;
    let lamports = **collection_authority_record.lamports.borrow();
    **collection_authority_record.lamports.borrow_mut() = 0;
    **update_authority.lamports.borrow_mut() = lamports;
    let mut data = collection_authority_record.try_borrow_mut_data()?;
    data[0] = 0;
    Ok(())
}