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use {
    crate::{
        check_program_account,
        extension::{
            memo_transfer::{instruction::RequiredMemoTransfersInstruction, MemoTransfer},
            BaseStateWithExtensionsMut, PodStateWithExtensionsMut,
        },
        instruction::decode_instruction_type,
        pod::PodAccount,
        processor::Processor,
    },
    solana_program::{
        account_info::{next_account_info, AccountInfo},
        entrypoint::ProgramResult,
        msg,
        pubkey::Pubkey,
    },
};

/// Toggle the RequiredMemoTransfers extension, initializing the extension if
/// not already present.
fn process_toggle_required_memo_transfers(
    program_id: &Pubkey,
    accounts: &[AccountInfo],
    enable: bool,
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let token_account_info = next_account_info(account_info_iter)?;
    let owner_info = next_account_info(account_info_iter)?;
    let owner_info_data_len = owner_info.data_len();

    let mut account_data = token_account_info.data.borrow_mut();
    let mut account = PodStateWithExtensionsMut::<PodAccount>::unpack(&mut account_data)?;

    Processor::validate_owner(
        program_id,
        &account.base.owner,
        owner_info,
        owner_info_data_len,
        account_info_iter.as_slice(),
    )?;

    let extension = if let Ok(extension) = account.get_extension_mut::<MemoTransfer>() {
        extension
    } else {
        account.init_extension::<MemoTransfer>(true)?
    };
    extension.require_incoming_transfer_memos = enable.into();
    Ok(())
}

pub(crate) fn process_instruction(
    program_id: &Pubkey,
    accounts: &[AccountInfo],
    input: &[u8],
) -> ProgramResult {
    check_program_account(program_id)?;

    match decode_instruction_type(input)? {
        RequiredMemoTransfersInstruction::Enable => {
            msg!("RequiredMemoTransfersInstruction::Enable");
            process_toggle_required_memo_transfers(program_id, accounts, true /* enable */)
        }
        RequiredMemoTransfersInstruction::Disable => {
            msg!("RequiredMemoTransfersInstruction::Disable");
            process_toggle_required_memo_transfers(program_id, accounts, false /* disable */)
        }
    }
}