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// Copyright 2020-2022 Clemens Lutz
//
// 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 datagen::error::Error as DatagenError;
use numa_gpu::error::Error as NumaGpuError;
use rayon::ThreadPoolBuildError;
use rustacuda::error::CudaError;
use std::convert::From;

pub type Result<T> = std::result::Result<T, Error>;

#[derive(Debug)]
pub enum ErrorKind {
    CsvError(csv::Error),
    CudaError(CudaError),
    DatagenError(DatagenError),
    IntegerOverflow(String),
    InvalidArgument(String),
    InvalidConversion(String),
    IoError(::std::io::Error),
    LogicError(String),
    NumaGpuError(NumaGpuError),
    RuntimeError(String),
    RayonThreadPoolBuildError(ThreadPoolBuildError),
}

#[derive(Debug)]
pub struct Error {
    kind: ErrorKind,
}

impl std::error::Error for Error {}

impl std::fmt::Display for Error {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        std::fmt::Display::fmt(&self.kind, f)
    }
}

impl From<csv::Error> for Error {
    fn from(error: csv::Error) -> Self {
        Self {
            kind: ErrorKind::CsvError(error),
        }
    }
}

impl From<CudaError> for Error {
    fn from(error: CudaError) -> Self {
        Self {
            kind: ErrorKind::CudaError(error),
        }
    }
}

impl From<DatagenError> for Error {
    fn from(error: DatagenError) -> Self {
        Self {
            kind: ErrorKind::DatagenError(error),
        }
    }
}

impl From<::std::io::Error> for Error {
    fn from(error: ::std::io::Error) -> Self {
        Self {
            kind: ErrorKind::IoError(error),
        }
    }
}

impl From<NumaGpuError> for Error {
    fn from(error: NumaGpuError) -> Self {
        Self {
            kind: ErrorKind::NumaGpuError(error),
        }
    }
}

impl From<ThreadPoolBuildError> for Error {
    fn from(error: ThreadPoolBuildError) -> Self {
        Self {
            kind: ErrorKind::RayonThreadPoolBuildError(error),
        }
    }
}

impl From<ErrorKind> for Error {
    fn from(kind: ErrorKind) -> Self {
        Self { kind }
    }
}

impl std::fmt::Display for ErrorKind {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            ErrorKind::CsvError(ref e) => e.fmt(f),
            ErrorKind::CudaError(ref e) => e.fmt(f),
            ErrorKind::DatagenError(ref e) => e.fmt(f),
            ErrorKind::IntegerOverflow(ref s) => write!(f, "Integer overflow: {}", s),
            ErrorKind::InvalidArgument(ref s) => write!(f, "Invalid argument: {}", s),
            ErrorKind::InvalidConversion(ref s) => write!(f, "Invalid conversion: {}", s),
            ErrorKind::IoError(ref e) => e.fmt(f),
            ErrorKind::LogicError(ref s) => write!(f, "Logic error: {}", s),
            ErrorKind::NumaGpuError(ref e) => e.fmt(f),
            ErrorKind::RuntimeError(ref s) => write!(f, "Runtime error: {}", s),
            ErrorKind::RayonThreadPoolBuildError(ref e) => e.fmt(f),
        }
    }
}