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/*
 * Copyright 2018 Intel Corporation
 *
 * 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 std::error::Error;
use std::fmt;

use crate::protos::ProtoConversionError;
use cbor::decoder::DecodeError;
use cbor::encoder::EncodeError;
use protobuf::ProtobufError;

use crate::database::error::DatabaseError;

#[derive(Debug)]
pub enum StateDatabaseError {
    NotFound(String),
    DeserializationError(DecodeError),
    SerializationError(EncodeError),
    ChangeLogEncodingError(String),
    InvalidRecord,
    InvalidHash(String),
    InvalidChangeLogIndex(String),
    DatabaseError(DatabaseError),
    ProtobufConversionError(ProtoConversionError),
    UnknownError,
}

impl fmt::Display for StateDatabaseError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            StateDatabaseError::NotFound(ref msg) => write!(f, "Value not found: {}", msg),
            StateDatabaseError::DeserializationError(ref err) => {
                write!(f, "Unable to deserialize entry: {}", err)
            }
            StateDatabaseError::SerializationError(ref err) => {
                write!(f, "Unable to serialize entry: {}", err)
            }
            StateDatabaseError::ChangeLogEncodingError(ref msg) => {
                write!(f, "Unable to serialize change log entry: {}", msg)
            }
            StateDatabaseError::InvalidRecord => write!(f, "A node was malformed"),
            StateDatabaseError::InvalidHash(ref msg) => {
                write!(f, "The given hash is invalid: {}", msg)
            }
            StateDatabaseError::InvalidChangeLogIndex(ref msg) => {
                write!(f, "A change log entry was missing or malformed: {}", msg)
            }
            StateDatabaseError::DatabaseError(ref err) => {
                write!(f, "A database error occurred: {}", err)
            }
            StateDatabaseError::ProtobufConversionError(ref err) => {
                write!(f, "A protobuf conversion error occurred: {}", err)
            }
            StateDatabaseError::UnknownError => write!(f, "An unknown error occurred"),
        }
    }
}

impl Error for StateDatabaseError {
    fn description(&self) -> &str {
        match *self {
            StateDatabaseError::NotFound(ref msg) => &msg,
            StateDatabaseError::DeserializationError(ref err) => err.description(),
            StateDatabaseError::SerializationError(ref err) => err.description(),
            StateDatabaseError::ChangeLogEncodingError(ref msg) => &msg,
            StateDatabaseError::InvalidRecord => "Invalid record",
            StateDatabaseError::InvalidHash(ref msg) => &msg,
            StateDatabaseError::InvalidChangeLogIndex(ref msg) => &msg,
            StateDatabaseError::DatabaseError(ref err) => err.description(),
            StateDatabaseError::ProtobufConversionError(ref err) => err.description(),
            StateDatabaseError::UnknownError => "Unknown Error",
        }
    }

    fn cause(&self) -> Option<&Error> {
        match *self {
            StateDatabaseError::NotFound(_) => None,
            StateDatabaseError::DeserializationError(ref err) => Some(err),
            StateDatabaseError::SerializationError(ref err) => Some(err),
            StateDatabaseError::ChangeLogEncodingError(_) => None,
            StateDatabaseError::InvalidRecord => None,
            StateDatabaseError::InvalidHash(_) => None,
            StateDatabaseError::InvalidChangeLogIndex(_) => None,
            StateDatabaseError::DatabaseError(ref err) => Some(err),
            StateDatabaseError::ProtobufConversionError(ref err) => Some(err),
            StateDatabaseError::UnknownError => None,
        }
    }
}

impl From<DatabaseError> for StateDatabaseError {
    fn from(err: DatabaseError) -> Self {
        StateDatabaseError::DatabaseError(err)
    }
}

impl From<EncodeError> for StateDatabaseError {
    fn from(err: EncodeError) -> Self {
        StateDatabaseError::SerializationError(err)
    }
}

impl From<DecodeError> for StateDatabaseError {
    fn from(err: DecodeError) -> Self {
        StateDatabaseError::DeserializationError(err)
    }
}

impl From<ProtobufError> for StateDatabaseError {
    fn from(error: ProtobufError) -> Self {
        use self::ProtobufError::*;
        match error {
            IoError(err) => StateDatabaseError::ChangeLogEncodingError(format!("{}", err)),
            WireError(err) => StateDatabaseError::ChangeLogEncodingError(format!("{:?}", err)),
            Utf8(err) => StateDatabaseError::ChangeLogEncodingError(format!("{}", err)),
            MessageNotInitialized { message: err } => {
                StateDatabaseError::ChangeLogEncodingError(err.to_string())
            }
        }
    }
}

impl From<ProtoConversionError> for StateDatabaseError {
    fn from(err: ProtoConversionError) -> Self {
        StateDatabaseError::ProtobufConversionError(err)
    }
}