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use solana_program::{
    account_info::AccountInfo,
    entrypoint::ProgramResult,
    msg,
    program::{invoke, invoke_signed},
    pubkey::Pubkey,
    rent::Rent,
    system_instruction,
    sysvar::Sysvar,
};

/// Create account almost from scratch, lifted from
/// <https://github.com/solana-labs/solana-program-library/tree/master/associated-token-account/program/src/processor.rs#L51-L98>
#[inline(always)]
pub fn create_or_allocate_account_raw<'a>(
    program_id: Pubkey,
    new_account_info: &AccountInfo<'a>,
    system_program_info: &AccountInfo<'a>,
    payer_info: &AccountInfo<'a>,
    size: usize,
    signer_seeds: &[&[u8]],
) -> ProgramResult {
    let rent = &Rent::get()?;
    let required_lamports = rent
        .minimum_balance(size)
        .max(1)
        .saturating_sub(new_account_info.lamports());

    if required_lamports > 0 {
        msg!("Transfer {} lamports to the new account", required_lamports);
        invoke(
            &system_instruction::transfer(payer_info.key, new_account_info.key, required_lamports),
            &[
                payer_info.clone(),
                new_account_info.clone(),
                system_program_info.clone(),
            ],
        )?;
    }

    let accounts = &[new_account_info.clone(), system_program_info.clone()];

    msg!("Allocate space for the account");
    invoke_signed(
        &system_instruction::allocate(new_account_info.key, size.try_into().unwrap()),
        accounts,
        &[signer_seeds],
    )?;

    msg!("Assign the account to the owning program");
    invoke_signed(
        &system_instruction::assign(new_account_info.key, &program_id),
        accounts,
        &[signer_seeds],
    )?;

    Ok(())
}

/// Resize an account using realloc, lifted from Solana Cookbook
#[inline(always)]
pub fn resize_or_reallocate_account_raw<'a>(
    target_account: &AccountInfo<'a>,
    funding_account: &AccountInfo<'a>,
    system_program: &AccountInfo<'a>,
    new_size: usize,
) -> ProgramResult {
    let rent = Rent::get()?;
    let new_minimum_balance = rent.minimum_balance(new_size);

    let lamports_diff = new_minimum_balance.saturating_sub(target_account.lamports());
    invoke(
        &system_instruction::transfer(funding_account.key, target_account.key, lamports_diff),
        &[
            funding_account.clone(),
            target_account.clone(),
            system_program.clone(),
        ],
    )?;

    target_account.realloc(new_size, false)?;

    Ok(())
}

/// Close src_account and transfer lamports to dst_account, lifted from Solana Cookbook
#[inline(always)]
pub fn close_account_raw<'a>(
    dest_account_info: &AccountInfo<'a>,
    src_account_info: &AccountInfo<'a>,
) -> ProgramResult {
    let dest_starting_lamports = dest_account_info.lamports();
    **dest_account_info.lamports.borrow_mut() = dest_starting_lamports
        .checked_add(src_account_info.lamports())
        .unwrap();
    **src_account_info.lamports.borrow_mut() = 0;

    let mut src_data = src_account_info.data.borrow_mut();
    src_data.fill(0);

    Ok(())
}