use bitflags::bitflags;
use std::{
    error::Error as StdError,
    fmt,
};

pub mod embedder;

pub(crate) const XEMBED_VERSION: u32 = 0;
pub(crate) const XEMBED_INFO_ATOM_NAME: &str = "_XEMBED_INFO";
pub(crate) const XEMBED_MESSAGE_ATOM_NAME: &str = "_XEMBED";

#[allow(dead_code)]
pub(crate) enum XEmbedMessage {
    EmbeddedNotify = 0,
    WindowActivate = 1,
    WindowDeactivate = 2,
    RequestFocus = 3,
    FocusIn = 4,
    FocusOut = 5,
    FocusNext = 6,
    FocusPrev = 7,
    ModalityOn = 10,
    ModalityOff = 11,
    RegisterAccelerator = 12,
    UnregisterAccelerator = 13,
    ActivateAccelerator = 14,
}

pub enum XEmbedFocus {
    Current = 0,
    First = 1,
    Last = 2,
}

bitflags! {
    struct XEmbedFlags: u32 {
        const MAPPED = (1 << 0);
    }

    struct XEmbedModifier: u32 {
        const SHIFT = (1 << 0);
        const CONTROL = (1 << 1);
        const ALT = (1 << 2);
        const SUPER = (1 << 3);
        const HYPER = (1 << 4);
    }

    struct XEmbedAcceleratorFlags: u32 {
        const OVERLOADED = (1 << 0);
    }
}

#[derive(Debug)]
pub enum Error {
    ProtocolError(String),
    Xcb(xcb::Error),
    ClientDestroyed,
}

impl fmt::Display for Error {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::ProtocolError(reason) => write!(f, "XEMBED: Protocol error: {}", reason),
            Self::Xcb(err) => write!(f, "XEMBED: {}", err),
            Self::ClientDestroyed => write!(f, "XEMBED: client destroyed"),
        }
    }
}

impl StdError for Error {
    fn source(&self) -> Option<&(dyn StdError + 'static)> {
        match self {
            Self::Xcb(err) => Some(err),
            _ => None,
        }
    }
}

impl From<xcb::Error> for Error {
    fn from(error: xcb::Error) -> Self {
        Self::Xcb(error)
    }
}

impl From<xcb::ProtocolError> for Error {
    fn from(error: xcb::ProtocolError) -> Self {
        Self::Xcb(xcb::Error::Protocol(error))
    }
}

impl From<xcb::ConnError> for Error {
    fn from(error: xcb::ConnError) -> Self {
        Self::Xcb(xcb::Error::Connection(error))
    }
}