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// Copyright (C) Parity Technologies (UK) Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use derive_more::From;

#[cfg(any(feature = "std", test, doc))]
use crate::engine::off_chain::OffChainError;

/// Errors that can be encountered upon environmental interaction.
#[derive(Debug, From, PartialEq, Eq)]
pub enum Error {
    /// Error upon decoding an encoded value.
    Decode(scale::Error),
    /// The static buffer used during ABI encoding or ABI decoding is too small.
    BufferTooSmall,
    /// An error that can only occur in the off-chain environment.
    #[cfg(any(feature = "std", test, doc))]
    OffChain(OffChainError),
    /// The call to another contract has trapped.
    CalleeTrapped,
    /// The call to another contract has been reverted.
    CalleeReverted,
    /// The queried contract storage entry is missing.
    KeyNotFound,
    /// Deprecated and no longer returned: There is only the minimum balance.
    _BelowSubsistenceThreshold,
    /// Transfer failed for other not further specified reason. Most probably
    /// reserved or locked balance of the sender that was preventing the transfer.
    TransferFailed,
    /// Deprecated and no longer returned: Endowment is no longer required.
    _EndowmentTooLow,
    /// No code could be found at the supplied code hash.
    CodeNotFound,
    /// The account that was called is no contract, but a plain account.
    NotCallable,
    /// An unknown error has occurred.
    Unknown,
    /// The call to `debug_message` had no effect because debug message
    /// recording was disabled.
    LoggingDisabled,
    /// The call dispatched by `call_runtime` was executed but returned an error.
    CallRuntimeFailed,
    /// ECDSA pubkey recovery failed. Most probably wrong recovery id or signature.
    EcdsaRecoveryFailed,
    /// sr25519 signature verification failed.
    Sr25519VerifyFailed,
}

/// A result of environmental operations.
pub type Result<T> = core::result::Result<T, Error>;