//! Some libxkbcommon bindings.
//!
//! We do not wrap the full funcionality of xkb, as wlc handles
//! most of the setup.

pub mod keysyms;

/*
 * Copyright 1985, 1987, 1990, 1998  The Open Group
 * Copyright 2008  Dan Nicholson
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * Except as contained in this notice, the names of the authors or their
 * institutions shall not be used in advertising or otherwise to promote the
 * sale, use or other dealings in this Software without prior written
 * authorization from the authors.
 */

/************************************************************
 * Copyright (c) 1993 by Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for any purpose and without
 * fee is hereby granted, provided that the above copyright
 * notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting
 * documentation, and that the name of Silicon Graphics not be
 * used in advertising or publicity pertaining to distribution
 * of the software without specific prior written permission.
 * Silicon Graphics makes no representation about the suitability
 * of this software for any purpose. It is provided "as is"
 * without any express or implied warranty.
 *
 * SILICON GRAPHICS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
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/*
 * Copyright © 2009-2012 Daniel Stone
 * Copyright © 2012 Intel Corporation
 * Copyright © 2012 Ran Benita
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Author: Daniel Stone <daniel@fooishbar.org>
 */

// Keysym utils functions

// An xkb keycode.
// Keycodes are handled by wlc
// #[derive(Debug, Clone, PartialEq, Eq)]
// pub struct Keycode(u32);

/// An xkb keysym.
///
/// # From xkb
/// A number used to represent the symbols generated from a key on a keyboard.
///
/// A key, represented by a keycode, may generate different symbols according
/// to keyboard state.  For example, on a QWERTY keyboard, pressing the key
/// labled \<A\> generates the symbol 'a'.  If the Shift key is held, it
/// generates the symbol 'A'.  If a different layout is used, say Greek,
/// it generates the symbol 'α'.  And so on.
///
/// Each such symbol is represented by a keysym.  Note that keysyms are
/// somewhat more general, in that they can also represent some "function",
/// such as "Left" or "Right" for the arrow keys.  For more information,
/// see:
/// http://www.x.org/releases/X11R7.7/doc/xproto/x11protocol.html#keysym_encoding
///
/// Specifically named keysyms can be found in the
/// `xkbcommon/xkbcommon-keysyms.h` header file.  Their name does not include
/// the XKB_KEY_ prefix.
///
/// Besides those, any Unicode/ISO 10646 character in the range U0100 to
/// U10FFFF can be represented by a keysym value in the range 0x01000100 to
/// 0x0110FFFF.  The name of Unicode keysyms is "U<codepoint>", e.g. "UA1B2".
///
/// The name of other unnamed keysyms is the hexadecimal representation of
/// their value, e.g. "0xabcd1234". Keysym names are case-sensitive.
///
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct Keysym(u32);

/// Represents flags used for `Keysym::from_name`
#[repr(C)]
#[derive(Debug, Clone, PartialEq, Eq)]
pub enum NameFlags {
    /// None, or "Case sensitive"
    None = 0,
    /// Case insensitive name search
    CaseInsensitive = 1
}

/// Opaque keyboard state object.
///
/// State objects contain the active state of a keyboard (or keyboards), such
/// as the currently effective layout and the active modifiers.  It acts as a
/// simple state machine, wherein key presses and releases are the input, and
/// key symbols (keysyms) are the output.
#[repr(C)]
pub struct XKBState;

/// Opaque compiled keymap object.
///
/// The keymap object holds all of the static keyboard information obtained
/// from compiling XKB files.
///
/// A keymap is immutable after it is created (besides reference counts, etc.);
/// if you need to change it, you must create a new one.
#[repr(C)]
pub struct XKBKeymap;

impl Keysym {

    /// Whether this keysym is a valid keysym.
    ///
    /// This checks whether the Keysym's value isn't `0` or `0xffffffff`.
    ///
    /// Tested on `libxkbcommon 0.5.0-1`, keysyms less than `0x20000000`
    /// stopped having meaningful names (`.get_name()` returned `None`).
    ///
    /// # Validity
    /// If a call to `Keysym::from_name(some_name)` returns a `Some(named_sym)`
    /// , `named_sym.is_valid()` will return true.
    ///
    /// In general, whenever a Keysym `sym` passes `sym.is_valid()`,
    /// `sym.get_name()` will be a `Some` (for keysyms less than 0x20000000).
    ///
    /// In addition, if `sym.get_name()` is a `Some(name)`,
    /// `Keysym::from_name(name)` will also return a valid Keysym.
    /// # Examples
    /// ```rust
    /// use rustwlc::xkb::Keysym;
    ///
    /// let sym = Keysym::from(0x41); // Something
    /// assert!(sym.is_valid());
    /// ```
    #[inline]
    pub fn is_valid(&self) -> bool {
        self.0 != 0 && self.0 != 0xffffffff
    }

    /// Whether a Keysym is invalid.
    ///
    /// See `is_valid()`.
    #[inline]
    pub fn is_invalid(&self) -> bool {
        self.0 == 0 || self.0 == 0xffffffff
    }

    /// Gets the `Keysym` as a `u32`.
    pub fn get_code(&self) -> u32 {
        self.0
    }

    /// Gets the Keysym for the given name.
    ///
    /// # Arguments
    /// name: The name of a keysym. See docs for `get_name`.
    /// This function will accept any name returned by that function.
    ///
    /// flags: A set of flags controlling how the search is done.
    /// If the KeyboardFlags::CaseInsensitive flag is used and two keysym names
    /// differ only by case, then the lower-case keysym is returned.  For
    /// instance, for KEY_a and KEY_A, this function would return KEY_a for the
    /// case-insensitive search.  If this functionality is needed, it is
    /// recommended to first call this function without this flag, and if that
    /// fails, only then to try with this flag, while possibly warning the user
    /// that they have misspelled the name, and might get wrong results.
    ///
    /// returns: The keysym. If the name is invalid, returns None.
    ///
    /// # Examples
    /// ```no-run
    /// use rustwlc::xkb::{Keysym, NameFlags};
    ///
    /// let key_match_a = Keysym::from_name("a".to_string(), NameFlags::None);
    /// assert!(key_match_a.is_some());
    ///
    /// let key_a = key_match_a.unwrap();
    /// assert!(key_a.is_valid());
    /// ```
    pub fn from_name(name: String, flags: NameFlags) -> Option<Keysym> {
        None
    }

    /// Gets name name of the keysym.
    ///
    /// # Examples
    /// ```no-run
    /// use rustwlc::xkb::{Keysym, NameFlags};
    ///
    /// let key = Keysym::from_name("a".to_string(), NameFlags::None).unwrap();
    ///
    /// assert_eq!(key.get_name(), Some("a".to_string()));
    /// ```
    pub fn get_name(&self) -> Option<String> {
        None
    }

    /// Gets the Unicode/UTF8 representation of this keysym.
    pub fn to_utf8(&self) -> Option<String> {
        None
    }

    /// Gets the Unicode/UTF32 representation of this keysym.
    pub fn to_utf32(&self) -> u32 {
        unimplemented!()
    }
}

/// An error returned from attempting to crete a Keysym.
///
/// Returned by `Keysym::from()`, `Keysym::from_name()`
pub struct KeysymParseError;

impl From<u32> for Keysym {

    #[inline]
    fn from(value: u32) -> Self {
        Keysym(value)
    }
}