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cfg_if::cfg_if! {
    if #[cfg(all(target_arch = "wasm32", target_os = "wasi"))] {
        mod wasi;
        use wasi as imp;
    } else {
        mod ext;
        use ext as imp;
    }
}

pub use imp::{
    address, balance, code, emit, err, input, payer, read, ret, sender, transact, value, write,
};

#[derive(Debug, Eq, PartialEq, failure::Fail)]
pub enum Error {
    #[fail(display = "Unknown error occured.")]
    Unknown,

    #[fail(display = "Not enough funds to pay for transaction.")]
    InsufficientFunds,

    #[fail(display = "Invalid input provided to a transaction.")]
    InvalidInput,

    #[fail(display = "No account at destination of transaction.")]
    NoAccount,

    #[fail(display = "Transaction failed with status code {}.", code)]
    Execution { code: u32, payload: Vec<u8> },
}