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use std::{
    ffi::{c_void, OsStr},
    mem::size_of,
    ptr::null,
};

pub use windows::Win32::System::Memory::{
    self, FILE_MAP, FILE_MAP_READ, FILE_MAP_WRITE, MEMORY_BASIC_INFORMATION, PAGE_PROTECTION_FLAGS,
    PAGE_READWRITE,
};

use crate::*;

#[allow(non_snake_case)]
pub fn MapViewOfFile(
    hfilemappingobject: HANDLE,
    dwdesiredaccess: FILE_MAP,
    dwfileoffsethigh: u32,
    dwfileoffsetlow: u32,
    dwnumberofbytestomap: usize,
) -> Result<*mut c_void, Error> {
    let v = unsafe {
        Memory::MapViewOfFile(
            hfilemappingobject,
            dwdesiredaccess,
            dwfileoffsethigh,
            dwfileoffsetlow,
            dwnumberofbytestomap,
        )
    };

    if v.is_null() {
        return Err(Error::from_win32());
    }

    Ok(v)
}

#[allow(non_snake_case)]
pub fn UnmapViewOfFile(lpbaseaddress: *const c_void) -> Result<(), Error> {
    unsafe { Memory::UnmapViewOfFile(lpbaseaddress).ok() }
}

#[allow(non_snake_case)]
pub fn CreateFileMappingW<S: AsRef<OsStr>>(
    hfile: HANDLE,
    lpfilemappingattributes: Option<&SECURITY_ATTRIBUTES>,
    flprotect: PAGE_PROTECTION_FLAGS,
    dwmaximumsizehigh: u32,
    dwmaximumsizelow: u32,
    lpname: S,
) -> Result<HANDLE, Error> {
    let mut wchar_str = utf8_to_wchar(lpname)?;

    let sec_attr = match lpfilemappingattributes {
        Some(s) => s as *const SECURITY_ATTRIBUTES,
        None => null(),
    };

    let h = unsafe {
        Memory::CreateFileMappingW(
            hfile,
            sec_attr,
            flprotect,
            dwmaximumsizehigh,
            dwmaximumsizelow,
            PWSTR(wchar_str.as_mut_ptr()),
        )
    };

    h.ok()
}

#[allow(non_snake_case)]
pub fn VirtualQuery(
    lpaddress: *const c_void,
    lpbuffer: &mut MEMORY_BASIC_INFORMATION,
) -> Result<(), Error> {
    let bytes_written = unsafe {
        Memory::VirtualQuery(
            lpaddress,
            lpbuffer as *mut MEMORY_BASIC_INFORMATION,
            size_of::<MEMORY_BASIC_INFORMATION>(),
        )
    };

    if (bytes_written as usize) < size_of::<MEMORY_BASIC_INFORMATION>() {
        return Err(Error::from_win32());
    }

    Ok(())
}