//! The module including all wrapper types for FFI.

use std::ffi::c_void;
use num_enum::TryFromPrimitive;

// region: HICON

/// The type representing Win32 HICON handle.
/// 
/// In theory, we can fetch HICON type from "windows_sys" crate.
/// However, I don't want to add it as this crate's dependency,
/// because I don't use anything within it except this type.
/// So I check Microsoft document, re-define it in there for this crate.
/// Reference: <https://learn.microsoft.com/en-us/windows/win32/winprog/windows-data-types>
pub type HICON = *mut c_void;

/// The invalid value of Win32 HICON handle.
/// 
/// The same reason like [WFHICON] to re-define it in there.
pub const INVALID_HICON: HICON = std::ptr::null_mut();

// endregion

// region: Scope

/// The FFI wrapper for [wfassoc::Scope].
#[repr(u32)]
#[derive(Debug, Copy, Clone, TryFromPrimitive)]
pub enum Scope {
    User = 0,
    System = 1,
}

impl From<Scope> for wfassoc::Scope {
    fn from(value: Scope) -> Self {
        match value {
            Scope::User => wfassoc::Scope::User,
            Scope::System => wfassoc::Scope::System,
        }
    }
}

// endregion

// region: View

/// The FFI wrapper for [wfassoc::View].
#[repr(u32)]
#[derive(Debug, Copy, Clone, TryFromPrimitive)]
pub enum View {
    User = 0,
    System = 1,
    Hybrid = 2,
}

impl From<View> for wfassoc::View {
    fn from(value: View) -> Self {
        match value {
            View::User => wfassoc::View::User,
            View::System => wfassoc::View::System,
            View::Hybrid => wfassoc::View::Hybrid,
        }
    }
}

// endregion

// region: Misc Types and Constants

/// The invalid value of index.
pub const INVALID_INDEX: usize = usize::MAX;

// endregion