// Copyright 2013-2015, The Gtk-rs Project Developers.
// See the COPYRIGHT file at the top-level directory of this distribution.
// Licensed under the MIT license, see the LICENSE file or <http://opensource.org/licenses/MIT>

use cairo::{self, Surface};
use gdk_pixbuf;
use gdk_sys;
use glib::object::IsA;
use glib::translate::*;
use libc::{c_char, c_int};
use std::ptr;
use Cursor;
use EventMask;
use Visual;
use Window;

use {WindowType, WindowTypeHint, WindowWindowClass};

pub struct WindowAttr {
    pub title: Option<String>,
    pub event_mask: EventMask,
    pub x: Option<i32>,
    pub y: Option<i32>,
    pub width: i32,
    pub height: i32,
    pub wclass: WindowWindowClass,
    pub visual: Option<Visual>,
    pub window_type: WindowType,
    pub cursor: Option<Cursor>,
    pub override_redirect: bool,
    pub type_hint: Option<WindowTypeHint>,
}

impl Default for WindowAttr {
    fn default() -> WindowAttr {
        skip_assert_initialized!();
        WindowAttr {
            title: None,
            event_mask: EventMask::empty(),
            x: None,
            y: None,
            width: 400,
            height: 300,
            wclass: WindowWindowClass::InputOutput,
            visual: None,
            window_type: WindowType::Toplevel,
            cursor: None,
            override_redirect: false,
            type_hint: None,
        }
    }
}

impl WindowAttr {
    fn get_mask(&self) -> u32 {
        let mut mask: gdk_sys::GdkWindowAttributesType = 0;
        if self.title.is_some() {
            mask |= gdk_sys::GDK_WA_TITLE;
        }
        if self.x.is_some() {
            mask |= gdk_sys::GDK_WA_X;
        }
        if self.y.is_some() {
            mask |= gdk_sys::GDK_WA_Y;
        }
        if self.cursor.is_some() {
            mask |= gdk_sys::GDK_WA_CURSOR;
        }
        if self.visual.is_some() {
            mask |= gdk_sys::GDK_WA_VISUAL;
        }
        if self.override_redirect {
            mask |= gdk_sys::GDK_WA_NOREDIR;
        }
        if self.type_hint.is_some() {
            mask |= gdk_sys::GDK_WA_TYPE_HINT;
        }
        mask
    }
}

#[cfg_attr(feature = "cargo-clippy", allow(type_complexity))]
impl<'a> ToGlibPtr<'a, *mut gdk_sys::GdkWindowAttr> for WindowAttr {
    type Storage = (
        Box<gdk_sys::GdkWindowAttr>,
        Stash<'a, *mut gdk_sys::GdkVisual, Option<Visual>>,
        Stash<'a, *mut gdk_sys::GdkCursor, Option<Cursor>>,
        Stash<'a, *const c_char, Option<String>>,
    );

    fn to_glib_none(&'a self) -> Stash<'a, *mut gdk_sys::GdkWindowAttr, Self> {
        let title = self.title.to_glib_none();
        let visual = self.visual.to_glib_none();
        let cursor = self.cursor.to_glib_none();

        let mut attrs = Box::new(gdk_sys::GdkWindowAttr {
            title: title.0 as *mut c_char,
            event_mask: self.event_mask.bits() as i32,
            x: self.x.unwrap_or(0),
            y: self.y.unwrap_or(0),
            width: self.width,
            height: self.height,
            wclass: self.wclass.to_glib(),
            visual: visual.0,
            window_type: self.window_type.to_glib(),
            cursor: cursor.0,
            wmclass_name: ptr::null_mut(),
            wmclass_class: ptr::null_mut(),
            override_redirect: self.override_redirect.to_glib(),
            type_hint: self.type_hint.unwrap_or(WindowTypeHint::Normal).to_glib(),
        });

        Stash(&mut *attrs, (attrs, visual, cursor, title))
    }
}

impl Window {
    /// Creates a new `Window` using the attributes from
    /// `attributes`. See `WindowAttr` and `WindowAttributesType` for
    /// more details. Note: to use this on displays other than the default
    /// display, `parent` must be specified.
    /// ## `parent`
    /// a `Window`, or `None` to create the window as a child of
    ///  the default root window for the default display.
    /// ## `attributes`
    /// attributes of the new window
    /// ## `attributes_mask`
    /// mask indicating which
    ///  fields in `attributes` are valid
    ///
    /// # Returns
    ///
    /// the new `Window`
    pub fn new(parent: Option<&Window>, attributes: &WindowAttr) -> Window {
        assert_initialized_main_thread!();
        unsafe {
            from_glib_full(gdk_sys::gdk_window_new(
                parent.to_glib_none().0,
                attributes.to_glib_none().0,
                attributes.get_mask() as c_int,
            ))
        }
    }

    pub fn create_similar_surface(
        &self,
        content: cairo::Content,
        width: i32,
        height: i32,
    ) -> Option<Surface> {
        unsafe {
            from_glib_full(gdk_sys::gdk_window_create_similar_surface(
                self.to_glib_none().0,
                content.into(),
                width,
                height,
            ))
        }
    }
}

pub trait WindowExtManual: 'static {
    /// For most purposes this function is deprecated in favor of
    /// `gobject::Object::set_data`. However, for historical reasons GTK+ stores
    /// the ``GtkWidget`` that owns a `Window` as user data on the
    /// `Window`. So, custom widget implementations should use
    /// this function for that. If GTK+ receives an event for a `Window`,
    /// and the user data for the window is non-`None`, GTK+ will assume the
    /// user data is a ``GtkWidget``, and forward the event to that widget.
    /// ## `user_data`
    /// user data
    unsafe fn set_user_data<T>(&self, user_data: &mut T);

    /// Retrieves the user data for `self`, which is normally the widget
    /// that `self` belongs to. See `Window::set_user_data`.
    /// ## `data`
    /// return location for user data
    #[cfg_attr(feature = "cargo-clippy", allow(mut_from_ref))]
    unsafe fn get_user_data<T>(&self) -> &mut T;

    fn get_default_root_window() -> Window;

    fn offscreen_window_set_embedder(&self, embedder: &Window);

    fn offscreen_window_get_embedder(&self) -> Option<Window>;

    fn offscreen_window_get_surface(&self) -> Option<Surface>;

    fn get_pixbuf(
        &self,
        src_x: i32,
        src_y: i32,
        width: i32,
        height: i32,
    ) -> Option<gdk_pixbuf::Pixbuf>;

    /// Gets the pattern used to clear the background on `self`.
    ///
    /// # Deprecated since 3.22
    ///
    /// Don't use this function
    ///
    /// # Returns
    ///
    /// The pattern to use for the
    /// background or `None` if there is no background.
    fn get_background_pattern(&self) -> Option<cairo::Pattern>;

    /// Sets the background of `self`.
    ///
    /// A background of `None` means that the window won't have any background. On the
    /// X11 backend it's also possible to inherit the background from the parent
    /// window using `gdk_x11_get_parent_relative_pattern`.
    ///
    /// The windowing system will normally fill a window with its background
    /// when the window is obscured then exposed.
    ///
    /// # Deprecated since 3.22
    ///
    /// Don't use this function
    /// ## `pattern`
    /// a pattern to use, or `None`
    fn set_background_pattern(&self, pattern: Option<&cairo::Pattern>);
}

impl<O: IsA<Window>> WindowExtManual for O {
    unsafe fn set_user_data<T>(&self, user_data: &mut T) {
        gdk_sys::gdk_window_set_user_data(
            self.as_ref().to_glib_none().0,
            user_data as *mut T as *mut _,
        )
    }

    unsafe fn get_user_data<T>(&self) -> &mut T {
        let mut pointer = ::std::ptr::null_mut();
        gdk_sys::gdk_window_get_user_data(self.as_ref().to_glib_none().0, &mut pointer);
        &mut *(pointer as *mut T)
    }

    fn get_default_root_window() -> Window {
        assert_initialized_main_thread!();
        unsafe { from_glib_none(gdk_sys::gdk_get_default_root_window()) }
    }

    fn offscreen_window_set_embedder(&self, embedder: &Window) {
        unsafe {
            gdk_sys::gdk_offscreen_window_set_embedder(
                self.as_ref().to_glib_none().0,
                embedder.to_glib_none().0,
            )
        }
    }

    fn offscreen_window_get_embedder(&self) -> Option<Window> {
        unsafe {
            from_glib_none(gdk_sys::gdk_offscreen_window_get_embedder(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    fn offscreen_window_get_surface(&self) -> Option<Surface> {
        skip_assert_initialized!();
        unsafe {
            from_glib_none(gdk_sys::gdk_offscreen_window_get_surface(
                self.as_ref().to_glib_none().0,
            ))
        }
    }

    fn get_pixbuf(
        &self,
        src_x: i32,
        src_y: i32,
        width: i32,
        height: i32,
    ) -> Option<gdk_pixbuf::Pixbuf> {
        skip_assert_initialized!();
        unsafe {
            from_glib_full(gdk_sys::gdk_pixbuf_get_from_window(
                self.as_ref().to_glib_none().0,
                src_x,
                src_y,
                width,
                height,
            ))
        }
    }

    fn get_background_pattern(&self) -> Option<cairo::Pattern> {
        unsafe {
            let ret = gdk_sys::gdk_window_get_background_pattern(self.as_ref().to_glib_none().0);
            if ret.is_null() {
                None
            } else {
                Some(cairo::Pattern::from_raw_none(ret))
            }
        }
    }

    fn set_background_pattern(&self, pattern: Option<&cairo::Pattern>) {
        unsafe {
            let ptr = if let Some(pattern) = pattern {
                pattern.to_raw_none()
            } else {
                ::std::ptr::null_mut()
            };
            gdk_sys::gdk_window_set_background_pattern(self.as_ref().to_glib_none().0, ptr);
        }
    }
}