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// Copyright 2018 Cloudbase Solutions Srl
//
// 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.

#![allow(non_camel_case_types)]

use std::error::Error;
use std::fmt;
use std::os::raw::{c_int, c_uchar, c_uint, c_ulonglong, c_ushort, c_void};

pub type HRESULT = c_int;
pub type UINT8 = c_uchar;
pub type UINT16 = c_ushort;
pub type UINT32 = c_uint;
pub type UINT64 = c_ulonglong;
pub type VOID = c_void;
pub type BOOL = c_int;
pub type DWORD = c_uint;
pub type SIZE_T = c_ulonglong;

pub const FALSE: i32 = 0;
pub const TRUE: i32 = 1;

pub const S_OK: HRESULT = 0;
pub const E_FAIL: HRESULT = -2147467259; // 0x80004005;
pub const ERROR_HV_NOT_PRESENT: HRESULT = -1070264320; // 0xC0351000
pub const E_INVALIDARG: HRESULT = -2147024809; // 0x80070057

#[derive(Debug)]
pub struct WHPError {
    result: HRESULT,
}

impl WHPError {
    pub fn new(result: HRESULT) -> WHPError {
        WHPError { result: result }
    }

    pub fn result(&self) -> HRESULT {
        self.result
    }
}

impl Error for WHPError {
    fn description(&self) -> &str {
        "WHP error"
    }
}

impl fmt::Display for WHPError {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "WHP error code: 0x{:X}", self.result)
    }
}

// TODO (alexpilotti): transform into a macro
pub fn check_result(res: HRESULT) -> Result<(), WHPError> {
    match res {
        S_OK => Ok(()),
        _ => Err(WHPError::new(res)),
    }
}

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

    #[test]
    fn test_check_result_ok() {
        check_result(S_OK).unwrap();
    }

    #[test]
    #[should_panic]
    fn test_check_result_fail() {
        check_result(E_INVALIDARG).unwrap();
    }
}