// FbWindow.cc for FbTk - fluxbox toolkit
// Copyright (c) 2002 - 2006 Henrik Kinnunen (fluxgen at fluxbox dot org)
//
// 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 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.

#include "FbWindow.hh"
#include "FbPixmap.hh"
#include "FbString.hh"

#include "EventManager.hh"
#include "Color.hh"
#include "App.hh"
#include "Transparent.hh"

#include <X11/Xutil.h>
#include <X11/Xatom.h>

#ifdef HAVE_CASSERT
  #include <cassert>
#else
  #include <assert.h>
#endif

#include <limits>

namespace FbTk {

FbWindow::FbWindow():
    FbDrawable(),
    m_parent(0), m_screen_num(0), m_window(0),
    m_x(0), m_y(0), m_width(0), m_height(0),
    m_border_width(0), m_border_color(0),
    m_depth(0), m_destroy(true),
    m_lastbg_color_set(false), m_lastbg_color(0), m_lastbg_pm(0),
    m_renderer(0) {

}

FbWindow::FbWindow(const FbWindow& the_copy):
    FbDrawable(),
    m_parent(the_copy.parent()),
    m_screen_num(the_copy.screenNumber()), m_window(the_copy.window()),
    m_x(the_copy.x()), m_y(the_copy.y()),
    m_width(the_copy.width()), m_height(the_copy.height()),
    m_border_width(the_copy.borderWidth()),
    m_border_color(the_copy.borderColor()),
    m_depth(the_copy.depth()), m_destroy(true),
    m_lastbg_color_set(false), m_lastbg_color(0), m_lastbg_pm(0),
    m_renderer(the_copy.m_renderer) {
    the_copy.m_window = 0;
}

FbWindow::FbWindow(int screen_num,
                   int x, int y,
                   unsigned int width, unsigned int height,
                   long eventmask,
                   bool override_redirect,
                   bool save_unders,
                   unsigned int depth,
                   int class_type,
                   Visual *visual,
                   Colormap cmap):
    FbDrawable(),
    m_parent(0),
    m_screen_num(screen_num),
    m_window(0),
    m_x(0), m_y(0), m_width(1), m_height(1),
    m_border_width(0),
    m_border_color(0),
    m_depth(0),
    m_destroy(true),
    m_lastbg_color_set(false),
    m_lastbg_color(0),
    m_lastbg_pm(0), m_renderer(0) {

    create(RootWindow(display(), screen_num),
           x, y, width, height, eventmask,
           override_redirect, save_unders, depth, class_type, visual, cmap);
}

FbWindow::FbWindow(const FbWindow &parent,
                   int x, int y, unsigned int width, unsigned int height,
                   long eventmask,
                   bool override_redirect,
                   bool save_unders,
                   unsigned int depth,
                   int class_type,
                   Visual *visual,
                   Colormap cmap):
    FbDrawable(),
    m_parent(&parent),
    m_screen_num(parent.screenNumber()),
    m_window(0),
    m_x(0), m_y(0),
    m_width(1), m_height(1),
    m_destroy(true),
    m_lastbg_color_set(false), m_lastbg_color(0),
    m_lastbg_pm(0), m_renderer(0) {

    create(parent.window(), x, y, width, height, eventmask,
           override_redirect, save_unders, depth, class_type, visual, cmap);
}

FbWindow::FbWindow(Window client):
    FbDrawable(),
    m_parent(0), m_screen_num(0), m_window(0),
    m_x(0), m_y(0), m_width(1), m_height(1),
    m_border_width(0), m_border_color(0),
    m_depth(0), m_destroy(false), // don't destroy this window
    m_lastbg_color_set(false), m_lastbg_color(0), m_lastbg_pm(0),
    m_renderer(0) {
    setNew(client);
}

FbWindow::~FbWindow() {

    // Need to free xrender pics before destroying window
    if (m_transparent.get() != 0) {
        removeAlphaWin(*this);
        m_transparent.reset(0);
    }

    if (m_window != 0) {
        // so we don't get any dangling eventhandler for this window
        FbTk::EventManager::instance()->remove(m_window);
        if (m_destroy)
            XDestroyWindow(display(), m_window);
    }

}

void FbWindow::setBackgroundColor(const FbTk::Color &bg_color) {
    if (bg_color.isAllocated()) {
        m_lastbg_color = bg_color.pixel();
        m_lastbg_color_set = true;
        m_lastbg_pm = None;
    } else {
        m_lastbg_color_set = false;
    }

    updateBackground(false);
}

void FbWindow::setBackgroundPixmap(Pixmap bg_pixmap) {
    m_lastbg_pm = bg_pixmap;
    if (bg_pixmap != None)
        m_lastbg_color_set = false;

    updateBackground(false);
}

void FbWindow::invalidateBackground() {
    m_lastbg_pm = None;
    m_lastbg_color_set = false;
}

void FbWindow::updateBackground(bool only_if_alpha) {
    Pixmap newbg = m_lastbg_pm;
    int alpha = 255;
    bool free_newbg = false;

    if (m_lastbg_pm == None && !m_lastbg_color_set)
        return;

    if (m_transparent.get() != 0)
        alpha = m_transparent->alpha();

    if (only_if_alpha && alpha == 255) 
        return;

    // still use bg buffer pixmap if not transparent
    // cause it does nice caching things, assuming we have a renderer
    if (m_lastbg_pm != ParentRelative && (m_renderer || alpha != 255)) {
        // update source and destination if needed
        Pixmap root = FbPixmap::getRootPixmap(screenNumber());
        if (alpha != 255 && m_transparent->source() != root)
            m_transparent->setSource(root, screenNumber());

        FbPixmap newpm = FbPixmap(*this, width(), height(), depth());
        free_newbg = true; // newpm gets released to newbg at end of block
        GC gc = XCreateGC(display(), window(), 0, 0);

        if (m_lastbg_pm == None && m_lastbg_color_set) {
            XSetForeground(display(), gc, m_lastbg_color);
            newpm.fillRectangle(gc, 0, 0, width(), height());
        } else {
            // copy from window if no color and no bg...
            newpm.copyArea((m_lastbg_pm == None)?drawable():m_lastbg_pm, gc, 0, 0, 0, 0, width(), height());
        }
        XFreeGC(display(), gc);

        if (alpha != 255)
            m_transparent->setDest(newpm.drawable(), screenNumber());

        // get root position

        const FbWindow *root_parent = parent();
        // our position in parent ("root")
        int root_x = x() + borderWidth(), root_y = y() + borderWidth();
        if (root_parent != 0) {
            root_x += root_parent->x() + root_parent->borderWidth();
            root_y += root_parent->y() + root_parent->borderWidth();
            while (root_parent->parent() != 0) {
                root_parent = root_parent->parent();
                root_x += root_parent->x() + root_parent->borderWidth();
                root_y += root_parent->y() + root_parent->borderWidth();
            }
        }

        // render background image from root pos to our window
        if (alpha != 255)
            m_transparent->render(root_x, root_y,
                                  0, 0,
                                  width(), height());

        // render any foreground items
        if (m_renderer)
            m_renderer->renderForeground(*this, newpm);

        if (alpha != 255)
            m_transparent->freeDest(); // it's only temporary, don't leave it hanging around
        newbg = newpm.release();
    }

    if (newbg != None)
        XSetWindowBackgroundPixmap(display(), m_window, newbg);
    else if (m_lastbg_color_set)
        XSetWindowBackground(display(), m_window, m_lastbg_color);

    if (free_newbg)
        XFreePixmap(display(), newbg);
}

void FbWindow::setBorderColor(const FbTk::Color &border_color) {
    XSetWindowBorder(display(), m_window, border_color.pixel());
    m_border_color = border_color.pixel();
}

void FbWindow::setBorderWidth(unsigned int size) {
    XSetWindowBorderWidth(display(), m_window, size);
    m_border_width = size;
}

void FbWindow::setName(const char *name) {
    XStoreName(display(), m_window, name);
}

void FbWindow::setWindowRole(const char *windowRole) {
    XTextProperty tp;
    XStringListToTextProperty(const_cast<char **>(&windowRole), 1, &tp);
    XSetTextProperty(display(), m_window, &tp, XInternAtom(display(), "WM_WINDOW_ROLE", False));
    XFree(tp.value);
}

void FbWindow::setEventMask(long mask) {
    XSelectInput(display(), m_window, mask);
}

void FbWindow::clear() {
    XClearWindow(display(), m_window);
    if (m_lastbg_pm == ParentRelative && m_renderer)
        m_renderer->renderForeground(*this, *this);

}

void FbWindow::clearArea(int x, int y,
                         unsigned int width, unsigned int height,
                         bool exposures) {
    // TODO: probably could call renderForeground here (with x,y,w,h)
    if (m_lastbg_pm == ParentRelative && m_renderer)
        FbWindow::clear();
    else
        XClearArea(display(), window(), x, y, width, height, exposures);
}

// If override_is_offset, then dest_override is a pixmap located at the_x, the_y
// with size the_width x the_height  in the target window.

void FbWindow::updateTransparent(int the_x, int the_y, unsigned int the_width, unsigned int the_height, Pixmap dest_override, bool override_is_offset) {
#ifdef HAVE_XRENDER
    if (!m_transparent.get())
        return;

    if (width() == 0 || height() == 0)
        return;

    if (!dest_override && ((the_width == 0 && the_height == 0) ||
        (the_width == width() && the_height == height())) &&
        the_x <= 0 && the_y <= 0) {
        // do the whole thing
        updateBackground(true);
        return;
    }

    if (!dest_override)
        dest_override = window();

    if (the_width == 0 || the_height == 0) {
        the_width = width();
        the_height = height();
    }

    if (the_x < 0 || the_y < 0) {
        the_x = 0;
        the_y = 0;
    }

    // update source and destination if needed
    Pixmap root = FbPixmap::getRootPixmap(screenNumber());
    if (m_transparent->source() != root)
        m_transparent->setSource(root, screenNumber());

    if (m_transparent->dest() != dest_override)
        m_transparent->setDest(dest_override, screenNumber());

    // get root position

    const FbWindow *root_parent = parent();
    // our position in parent ("root")
    int root_x = x() + borderWidth(), root_y = y() + borderWidth();
    if (root_parent != 0) {
        root_x += root_parent->x() + root_parent->borderWidth();
        root_y += root_parent->y() + root_parent->borderWidth();
        while (root_parent->parent() != 0) {
            root_parent = root_parent->parent();
            root_x += root_parent->x() + root_parent->borderWidth();
            root_y += root_parent->y() + root_parent->borderWidth();
        }

    } // else toplevel window so we already have x, y set

    // render background image from root pos to our window
    m_transparent->render(root_x + the_x, root_y + the_y,
                          override_is_offset?0:the_x, override_is_offset?0:the_y,
                          the_width, the_height);
#endif // HAVE_XRENDER
}

void FbWindow::setAlpha(int alpha) {
#ifdef HAVE_XRENDER
    if (FbTk::Transparent::haveComposite()) {
        if (m_transparent.get() != 0) {
            removeAlphaWin(*this);
            m_transparent.reset(0);
        }

        // don't setOpaque, let controlling objects do that
        // since it's only needed on toplevel windows
    } else {
        if (!FbTk::Transparent::haveRender()) 
            alpha = 255;

        if (m_transparent.get() == 0 && alpha < 255) {
            m_transparent.reset(new Transparent(FbPixmap::getRootPixmap(screenNumber()), window(), alpha, screenNumber()));
            addAlphaWin(*this);
        } else if (alpha < 255 && alpha != m_transparent->alpha())
            m_transparent->setAlpha(alpha);
        else if (alpha == 255) {
            removeAlphaWin(*this);
            m_transparent.reset(0); // destroy transparent object
        }
    }
#endif // HAVE_XRENDER
}

int FbWindow::alpha() const {
#ifdef HAVE_XRENDER
    if (m_transparent.get())
        return m_transparent->alpha();
#endif // HAVE_XRENDER
    return 255;
}

FbWindow &FbWindow::operator = (const FbWindow &win) {
    m_parent = win.parent();
    m_screen_num = win.screenNumber();
    m_window = win.window();
    m_x = win.x();
    m_y = win.y();
    m_width = win.width();
    m_height = win.height();
    m_border_width = win.borderWidth();
    m_border_color = win.borderColor();
    m_depth = win.depth();
    // take over this window
    win.m_window = 0;
    return *this;
}

FbWindow &FbWindow::operator = (Window win) {
    setNew(win);
    return *this;
}

void FbWindow::setNew(Window win) {

    if (m_window != 0 && m_destroy)
        XDestroyWindow(display(), m_window);

    m_window = win;

    if (m_window != 0) {
        updateGeometry();
        XWindowAttributes attr;
        attr.screen = 0;
        //get screen number
        if (XGetWindowAttributes(display(),
                                 m_window,
                                 &attr) != 0 && attr.screen != 0) {
            m_screen_num = XScreenNumberOfScreen(attr.screen);
            if (attr.width <= 0)
                m_width = 1;
            else
                m_width = attr.width;

            if (attr.height <= 0)
                m_height = 1;
            else
                m_height = attr.height;

            m_x = attr.x;
            m_y = attr.y;
            m_depth = attr.depth;
            m_border_width = attr.border_width;
        }

    }
}

void FbWindow::show() {
    XMapWindow(display(), m_window);
}

void FbWindow::showSubwindows() {
    XMapSubwindows(display(), m_window);
}

void FbWindow::hide() {
    XUnmapWindow(display(), m_window);
}

void FbWindow::lower() {
    XLowerWindow(display(), window());
}

void FbWindow::raise() {
    XRaiseWindow(display(), window());
}

void FbWindow::setInputFocus(int revert_to, int time) {
    XSetInputFocus(display(), window(), revert_to, time);
}

void FbWindow::setCursor(Cursor cur) {
    XDefineCursor(display(), window(), cur);
}

void FbWindow::reparent(const FbWindow &parent, int x, int y, bool continuing) {
    XReparentWindow(display(), window(), parent.window(), x, y);
    m_parent = &parent;
    if (continuing) // we will continue managing this window after reparent
        updateGeometry();
}

namespace {
struct TextPropPtr {
    TextPropPtr(XTextProperty& prop):m_prop(prop) {}
    ~TextPropPtr() {
        if (m_prop.value != 0) {
            XFree(m_prop.value);
            m_prop.value = 0;
        }
    }
    XTextProperty& m_prop;
};
}

long FbWindow::cardinalProperty(Atom prop,bool*exists) const {
    Atom type;
    int format;
    unsigned long nitems, bytes_after;
    long* num;
    long ret=0;
    if (exists) *exists=false;
    if (property(prop, 0, 1, False, XA_CARDINAL, &type, &format, &nitems, &bytes_after, reinterpret_cast<unsigned char**>(&num))) {
        if (type == XA_CARDINAL && nitems) {
            ret = *num;
            if (exists) *exists=true;
        }
        XFree(num);
    }
    return ret;
}

FbTk::FbString FbWindow::textProperty(Atom prop,bool*exists) const {
    XTextProperty text_prop;
    TextPropPtr helper(text_prop);
    char ** stringlist = 0;
    int count = 0;
    FbTk::FbString ret;

    static const Atom utf8string = XInternAtom(display(), "UTF8_STRING", False);

    if (exists) *exists=false;
    if (XGetTextProperty(display(), window(), &text_prop, prop) == 0 || text_prop.value == 0 || text_prop.nitems == 0) {
        return "";
    }


    if (text_prop.encoding == XA_STRING) {
        if (XTextPropertyToStringList(&text_prop, &stringlist, &count) == 0 || count == 0) {
            return "";
        }
        ret = FbStringUtil::XStrToFb(stringlist[0]);
    } else if (text_prop.encoding == utf8string && text_prop.format == 8) {
#ifdef X_HAVE_UTF8_STRING
        Xutf8TextPropertyToTextList(display(), &text_prop, &stringlist, &count);
        if (count == 0 || stringlist == 0) {
            return "";
        }
#else
        if (XTextPropertyToStringList(&text_prop, &stringlist, &count) == 0 || count == 0 || stringlist == 0) {
            return "";
        }
#endif
        ret = stringlist[0];
    } else {
        // still returns a "StringList" despite the different name
        XmbTextPropertyToTextList(display(), &text_prop, &stringlist, &count);
        if (count == 0 || stringlist == 0) {
            return "";
        }
        ret = FbStringUtil::LocaleStrToFb(stringlist[0]);
    }

    // they all use stringlist
    if (stringlist) {
        XFreeStringList(stringlist);
    }
    if (exists) *exists=true;
    return ret;
}

bool FbWindow::property(Atom prop,
                        long long_offset, long long_length,
                        bool do_delete,
                        Atom req_type,
                        Atom *actual_type_return,
                        int *actual_format_return,
                        unsigned long *nitems_return,
                        unsigned long *bytes_after_return,
                        unsigned char **prop_return) const {
    if (XGetWindowProperty(display(), window(),
                           prop, long_offset, long_length, do_delete,
                           req_type, actual_type_return,
                           actual_format_return, nitems_return,
                           bytes_after_return, prop_return) == Success)
        return true;

    return false;
}

void FbWindow::changeProperty(Atom prop, Atom type,
                              int format,
                              int mode,
                              unsigned char *data,
                              int nelements) {

    XChangeProperty(display(), m_window, prop, type,
                    format, mode,
                    data, nelements);
}

void FbWindow::deleteProperty(Atom prop) {
    XDeleteProperty(display(), m_window, prop);
}

void FbWindow::addToSaveSet() {
    XAddToSaveSet(display(), m_window);
}

void FbWindow::removeFromSaveSet() {
    XRemoveFromSaveSet(display(), m_window);
}

int FbWindow::screenNumber() const {
    return m_screen_num;
}

long FbWindow::eventMask() const {
    XWindowAttributes attrib;
    XGetWindowAttributes(display(), window(),
                         &attrib);
    return attrib.your_event_mask;

}

void FbWindow::setOpaque(int alpha) {
#ifdef HAVE_XRENDER
    static const Atom alphaatom = XInternAtom(display(), "_NET_WM_WINDOW_OPACITY", False);
    unsigned long opacity = alpha * 0x1010101;
    changeProperty(alphaatom, XA_CARDINAL, 32, PropModeReplace, (unsigned char *) &opacity, 1l);
#endif // HAVE_XRENDER
}

bool FbWindow::updateGeometry() {
    if (m_window == 0)
        return false;

    int old_x = m_x, old_y = m_y;
    unsigned int old_width = m_width, old_height = m_height;

    Window root;
    unsigned int border_width, depth;
    if (XGetGeometry(display(), m_window, &root, &m_x, &m_y,
                     &m_width, &m_height, &border_width, &depth))
        m_depth = depth;

    return (old_x != m_x || old_y != m_y || old_width != m_width ||
            old_height != m_height);
}

void FbWindow::create(Window parent, int x, int y,
                      unsigned int width, unsigned int height,
                      long eventmask, bool override_redirect,
                      bool save_unders, unsigned int depth, int class_type,
                      Visual *visual, Colormap cmap) {
    m_border_width = 0;
    m_border_color = 0;

    long valmask = CWEventMask;
    XSetWindowAttributes values;
    values.event_mask = eventmask;

    if (override_redirect) {
        valmask |= CWOverrideRedirect;
        values.override_redirect = True;
    }

    if (save_unders) {
        valmask |= CWSaveUnder;
        values.save_under = True;
    }

    if (cmap != CopyFromParent) {
        valmask |= CWColormap | CWBackPixel | CWBorderPixel;
        values.colormap = cmap;
        values.background_pixel = XWhitePixel(display(), 0);
        values.border_pixel = XBlackPixel(display(), 0);
    }

    m_window = XCreateWindow(display(), parent, x, y, width, height,
                             0, // border width
                             depth, // depth
                             class_type, // class
                             visual, // visual
                             valmask, // create mask
                             &values); // create atrribs

    assert(m_window);

    updateGeometry();
}


void FbWindow::sendConfigureNotify(int x, int y, 
                                   unsigned int width, unsigned int height,
                                   unsigned int bw) {
    Display *disp = FbTk::App::instance()->display();
    XEvent event;
    event.type = ConfigureNotify;

    event.xconfigure.display = disp;
    event.xconfigure.event = window();
    event.xconfigure.window = window();
    event.xconfigure.x = x;
    event.xconfigure.y = y;
    event.xconfigure.width = width;
    event.xconfigure.height = height;
    event.xconfigure.border_width = bw;
    event.xconfigure.above = None; 
    event.xconfigure.override_redirect = false;

    XSendEvent(disp, window(), False, StructureNotifyMask, &event);

}

FbWindow::FbWinList FbWindow::m_alpha_wins;

void FbWindow::addAlphaWin(FbWindow &win) {
    m_alpha_wins.insert(&win);
}

void FbWindow::removeAlphaWin(FbWindow &win) {
    FbWinList::iterator it = m_alpha_wins.find(&win);
    if (it != m_alpha_wins.end())
        m_alpha_wins.erase(it);
}

void FbWindow::updatedAlphaBackground(int screen) {
    FbWinList::iterator it = m_alpha_wins.begin();
    FbWinList::iterator it_end = m_alpha_wins.end();
    for (; it != it_end; ++it) {
        if ((*it)->screenNumber() == screen) {
            (*it)->updateBackground(false);
            (*it)->clear();
        }
    }
}

bool operator == (Window win, const FbWindow &fbwin) {
    return win == fbwin.window();
}

}