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use winapi::shared::windef::{HWND, HMENU};
use crate::win32::window_helper as wh;


/**
    Inner handle type used internally by each control.
*/
#[derive(Debug, Clone, Copy)]
pub enum ControlHandle {
    NoHandle,
    Hwnd(HWND),

    /// (Parent menu / Menu). 
    /// Parent menu must be there as WINAPI does not have any function to fetch the parent
    Menu(HMENU, HMENU),

    /// (Parent window / Menu). 
    PopMenu(HWND, HMENU),

    /// (Parent menu / Unique ID). 
    MenuItem(HMENU, u32),

    /// Notice control
    Notice(HWND, u32),

    /// Timer control
    Timer(HWND, u32),

    /// System tray control
    SystemTray(HWND)
}

impl ControlHandle {

    /// Destroy the underlying object and set the handle to `NoHandle`
    /// Can be used to "reset" a UI component
    pub fn destroy(&mut self) {
        match self {
            &mut ControlHandle::Hwnd(h) => wh::destroy_window(h),
            _ => {}
        }

        *self = ControlHandle::NoHandle;
    }

    pub fn blank(&self) -> bool {
        match self {
            &ControlHandle::NoHandle => true,
            _ => false
        }
    }

    pub fn hwnd(&self) -> Option<HWND> {
        match self {
            &ControlHandle::Hwnd(h) => Some(h),
            _ => None,
        }
    }

    pub fn hmenu(&self) -> Option<(HMENU, HMENU)> {
        match self {
            &ControlHandle::Menu(h1, h2) => Some((h1, h2)),
            _ => None,
        }
    }

    pub fn pop_hmenu(&self) -> Option<(HWND, HMENU)> {
        match self {
            &ControlHandle::PopMenu(h1, h2) => Some((h1, h2)),
            _ => None,
        }
    }

    pub fn hmenu_item(&self) -> Option<(HMENU, u32)> {
        match self {
            &ControlHandle::MenuItem(h, i) => Some((h, i)),
            _ => None,
        }
    }

    pub fn timer(&self) -> Option<(HWND, u32)> {
        match self {
            &ControlHandle::Timer(h, i) => Some((h, i)),
            _ => None,
        }
    }

    pub fn notice(&self) -> Option<(HWND, u32)> {
        match self {
            &ControlHandle::Notice(h, i) => Some((h, i)),
            _ => None,
        }
    }

    pub fn tray(&self) -> Option<HWND> {
        match self {
            &ControlHandle::SystemTray(h) => Some(h),
            _ => None,
        }
    }

}


impl Default for ControlHandle {

    fn default() -> ControlHandle {
        ControlHandle::NoHandle
    }

}

impl PartialEq for ControlHandle {
    fn eq(&self, other: &Self) -> bool {
        match self {
            // NoHandle
            &ControlHandle::NoHandle => match other {
                &ControlHandle::NoHandle => true,
                _ => false
            },
            // HWND
            &ControlHandle::Hwnd(hwnd1) => match other {
                &ControlHandle::Hwnd(hwnd2) => hwnd1 == hwnd2,
                _ => false
            },
            // HMENU
            &ControlHandle::Menu(_, h1) => match other {
                &ControlHandle::Menu(_, h2) => h1 == h2,
                _ => false
            },
            // HMENU
            &ControlHandle::PopMenu(_, h1) => match other {
                &ControlHandle::Menu(_, h2) => h1 == h2,
                _ => false
            },
            // HMENU / ITEM
            &ControlHandle::MenuItem(_, id1) => match other {
                &ControlHandle::MenuItem(_, id2) => id1 == id2,
                _ => false
            },
            // TIMER 
            &ControlHandle::Timer(hwnd1, id1) => match other {
                &ControlHandle::Timer(hwnd2, id2) => hwnd1 == hwnd2 && id1 == id2,
                _ => false
            },
            // Notice
            &ControlHandle::Notice(hwnd1, id1) => match other {
                &ControlHandle::Notice(hwnd2, id2) => hwnd1 == hwnd2 && id1 == id2,
                _ => false
            },
            // System tray
            &ControlHandle::SystemTray(hwnd1) => match other {
                &ControlHandle::SystemTray(hwnd2) => hwnd1 == hwnd2,
                _ => false
            }
        }
    }
}

impl Eq for ControlHandle {}

impl From<&ControlHandle> for ControlHandle {
    fn from(control: &ControlHandle) -> Self { *control }
}