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use solana_program::{
    account_info::AccountInfo,
    entrypoint::ProgramResult,
    msg,
    program::{invoke, invoke_signed},
    program_memory::sol_memcmp,
    pubkey::{Pubkey, PUBKEY_BYTES},
    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(())
}

pub fn cmp_pubkeys(a: &Pubkey, b: &Pubkey) -> bool {
    sol_memcmp(a.as_ref(), b.as_ref(), PUBKEY_BYTES) == 0
}

#[cfg(test)]
pub mod tests {
    use super::*;

    #[test]
    fn check_keys_equal() {
        let key1 = Pubkey::new_unique();
        assert!(cmp_pubkeys(&key1, &key1));
    }

    #[test]
    fn check_keys_not_equal() {
        let key1 = Pubkey::new_unique();
        let key2 = Pubkey::new_unique();
        assert!(!cmp_pubkeys(&key1, &key2));
    }
}