/*
 * titlebar.c - titlebar management
 *
 * Copyright © 2008 Julien Danjou <julien@danjou.info>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */

#include <xcb/xcb.h>
#include <xcb/xcb_aux.h>

#include <math.h>

#include "titlebar.h"
#include "screen.h"
#include "layouts/floating.h"

extern AwesomeConf globalconf;

/** Initialize a titlebar: create the simple_window_t.
 * We still need to update its geometry to have it placed correctly.
 * \param c the client
 */
void
titlebar_init(Client *c)
{
    int width;

    if(!c->titlebar.height)
        c->titlebar.height = 1.5 * MAX(c->titlebar.styles.normal.font->height,
                                       MAX(c->titlebar.styles.focus.font->height,
                                           c->titlebar.styles.urgent.font->height));

    switch(c->titlebar.position)
    {
      case Off:
        return;
      case Auto:
        c->titlebar.position = Off;
        return;
      case Top:
      case Bottom:
        if(!c->titlebar.width)
            width = c->geometry.width + 2 * c->border;
        else
            width = MIN(c->titlebar.width, c->geometry.width);
        c->titlebar.sw = simplewindow_new(globalconf.connection,
                                          c->phys_screen, 0, 0,
                                          width, c->titlebar.height, 0);
        break;
      case Left:
      case Right:
        if(!c->titlebar.width)
            width = c->geometry.height + 2 * c->border;
        else
            width = MIN(c->titlebar.width, c->geometry.height);
        c->titlebar.sw = simplewindow_new(globalconf.connection,
                                          c->phys_screen, 0, 0,
                                          c->titlebar.height, width, 0);
        break;
      default:
        break;
    }
    xcb_map_window(globalconf.connection, c->titlebar.sw->window);
}

/** Add the titlebar geometry to a geometry.
 * \param t the titlebar
 * \param geometry the geometry
 * \return a new geometry bigger if the titlebar is visible
 */
area_t
titlebar_geometry_add(titlebar_t *t, area_t geometry)
{
    if(!t->sw)
        return geometry;

    switch(t->position)
    {
      case Top:
        geometry.y -= t->sw->geometry.height;
        geometry.height += t->sw->geometry.height;
        break;
      case Bottom:
        geometry.height += t->sw->geometry.height;
        break;
      case Left:
        geometry.x -= t->sw->geometry.width;
        geometry.width += t->sw->geometry.width;
        break;
      case Right:
        geometry.width += t->sw->geometry.width;
        break;
      default:
        break;
    }

    return geometry;
}

/** Remove the titlebar geometry to a geometry.
 * \param t the titlebar
 * \param geometry the geometry
 * \return a new geometry smaller if the titlebar is visible
 */
area_t
titlebar_geometry_remove(titlebar_t *t, area_t geometry)
{
    if(!t->sw)
        return geometry;

    switch(t->position)
    {
      case Top:
        geometry.y += t->sw->geometry.height;
        geometry.height -= t->sw->geometry.height;
        break;
      case Bottom:
        geometry.height -= t->sw->geometry.height;
        break;
      case Left:
        geometry.x += t->sw->geometry.width;
        geometry.width -= t->sw->geometry.width;
        break;
      case Right:
        geometry.width -= t->sw->geometry.width;
        break;
      default:
        break;
    }

    return geometry;
}

/** Draw the titlebar content.
 * \param c the client
 */
void
titlebar_draw(Client *c)
{
    xcb_drawable_t dw = 0;
    DrawCtx *ctx;
    style_t style;
    area_t geometry;
    xcb_screen_t *s;

    if(!c->titlebar.sw)
        return;

    s = xcb_aux_get_screen(globalconf.connection,
                           c->titlebar.sw->phys_screen);

    switch(c->titlebar.position)
    {
      case Off:
        return;
      case Right:
      case Left:
        dw = xcb_generate_id(globalconf.connection);
        xcb_create_pixmap(globalconf.connection, s->root_depth,
                          dw,
                          s->root,
                          c->titlebar.sw->geometry.height,
                          c->titlebar.sw->geometry.width);
        ctx = draw_context_new(globalconf.connection, c->titlebar.sw->phys_screen,
                               c->titlebar.sw->geometry.height,
                               c->titlebar.sw->geometry.width,
                               dw);
        geometry.width = c->titlebar.sw->geometry.height;
        geometry.height = c->titlebar.sw->geometry.width;
        break;
      default:
        ctx = draw_context_new(globalconf.connection, c->titlebar.sw->phys_screen,
                               c->titlebar.sw->geometry.width,
                               c->titlebar.sw->geometry.height,
                               c->titlebar.sw->drawable);
        geometry = c->titlebar.sw->geometry;
        break;
    }

    /* Check if the client is focused/urgent/normal */
    if(globalconf.focus->client == c)
        style = c->titlebar.styles.focus;
    else if(c->isurgent)
        style = c->titlebar.styles.urgent;
    else
        style = c->titlebar.styles.normal;

    geometry.x = geometry.y = 0;

    draw_text(ctx, geometry, c->titlebar.text_align, style.font->height / 2,
              c->name, style);

    switch(c->titlebar.position)
    {
      case Left:
        draw_rotate(ctx, c->titlebar.sw->drawable, ctx->height, ctx->width,
                    - M_PI_2, 0, c->titlebar.sw->geometry.height);
        xcb_free_pixmap(globalconf.connection, dw);
        break;
      case Right:
        draw_rotate(ctx, c->titlebar.sw->drawable, ctx->height, ctx->width,
                    M_PI_2, c->titlebar.sw->geometry.width, 0);
        xcb_free_pixmap(globalconf.connection, dw);
      default:
        break;
    }

    simplewindow_refresh_drawable(c->titlebar.sw);

    draw_context_delete(&ctx);
}

/** Update the titlebar geometry for a floating client.
 * \param c the client
 */
void
titlebar_update_geometry_floating(Client *c)
{
    int width, x_offset = 0, y_offset = 0;

    if(!c->titlebar.sw)
        return;

    switch(c->titlebar.position)
    {
      default:
        return;
      case Off:
        return;
      case Top:
        if(!c->titlebar.width)
            width = c->geometry.width + 2 * c->border;
        else
            width = MIN(c->titlebar.width, c->geometry.width);
        switch(c->titlebar.align)
        {
          default:
            break;
          case AlignRight:
            x_offset = 2 * c->border + c->geometry.width - width;
            break;
          case AlignCenter:
            x_offset = (c->geometry.width - width) / 2;
            break;
        }
        simplewindow_move_resize(c->titlebar.sw,
                                 c->geometry.x + x_offset,
                                 c->geometry.y - c->titlebar.sw->geometry.height,
                                 width,
                                 c->titlebar.sw->geometry.height);
        break;
      case Bottom:
        if(!c->titlebar.width)
            width = c->geometry.width + 2 * c->border;
        else
            width = MIN(c->titlebar.width, c->geometry.width);
        switch(c->titlebar.align)
        {
          default:
            break;
          case AlignRight:
            x_offset = 2 * c->border + c->geometry.width - width;
            break;
          case AlignCenter:
            x_offset = (c->geometry.width - width) / 2;
            break;
        }
        simplewindow_move_resize(c->titlebar.sw,
                                 c->geometry.x + x_offset,
                                 c->geometry.y + c->geometry.height + 2 * c->border,
                                 width,
                                 c->titlebar.sw->geometry.height);
        break;
      case Left:
        if(!c->titlebar.width)
            width = c->geometry.height + 2 * c->border;
        else
            width = MIN(c->titlebar.width, c->geometry.height);
        switch(c->titlebar.align)
        {
          default:
            break;
          case AlignRight:
            y_offset = 2 * c->border + c->geometry.height - width;
            break;
          case AlignCenter:
            y_offset = (c->geometry.height - width) / 2;
            break;
        }
        simplewindow_move_resize(c->titlebar.sw,
                                 c->geometry.x - c->titlebar.sw->geometry.width,
                                 c->geometry.y + y_offset,
                                 c->titlebar.sw->geometry.width,
                                 width);
        break;
      case Right:
        if(!c->titlebar.width)
            width = c->geometry.height + 2 * c->border;
        else
            width = MIN(c->titlebar.width, c->geometry.height);
        switch(c->titlebar.align)
        {
          default:
            break;
          case AlignRight:
            y_offset = 2 * c->border + c->geometry.height - width;
            break;
          case AlignCenter:
            y_offset = (c->geometry.height - width) / 2;
            break;
        }
        simplewindow_move_resize(c->titlebar.sw,
                                 c->geometry.x + c->geometry.width + 2 * c->border,
                                 c->geometry.y + y_offset,
                                 c->titlebar.sw->geometry.width,
                                 width);
        break;
    }

    titlebar_draw(c);
}


/** Update the titlebar geometry for a tiled client.
 * \param c the client
 * \param geometry the geometry the client will receive
 */
void
titlebar_update_geometry(Client *c, area_t geometry)
{
    int width, x_offset = 0 , y_offset = 0;

    if(!c->titlebar.sw)
        return;

    switch(c->titlebar.position)
    {
      default:
        return;
      case Off:
        return;
      case Top:
        if(!c->titlebar.width)
            width = geometry.width + 2 * c->border;
        else
            width = MIN(c->titlebar.width, geometry.width);
        switch(c->titlebar.align)
        {
          default:
            break;
          case AlignRight:
            x_offset = 2 * c->border + geometry.width - width;
            break;
          case AlignCenter:
            x_offset = (geometry.width - width) / 2;
            break;
        }
        simplewindow_move_resize(c->titlebar.sw,
                                 geometry.x + x_offset,
                                 geometry.y,
                                 width,
                                 c->titlebar.sw->geometry.height);
        break;
      case Bottom:
        if(!c->titlebar.width)
            width = geometry.width + 2 * c->border;
        else
            width = MIN(c->titlebar.width, geometry.width);
        switch(c->titlebar.align)
        {
          default:
            break;
          case AlignRight:
            x_offset = 2 * c->border + geometry.width - width;
            break;
          case AlignCenter:
            x_offset = (geometry.width - width) / 2;
            break;
        }
        simplewindow_move_resize(c->titlebar.sw,
                                 geometry.x + x_offset,
                                 geometry.y + geometry.height
                                     - c->titlebar.sw->geometry.height + 2 * c->border,
                                 width,
                                 c->titlebar.sw->geometry.height);
        break;
      case Left:
        if(!c->titlebar.width)
            width = geometry.height + 2 * c->border;
        else
            width = MIN(c->titlebar.width, geometry.height);
        switch(c->titlebar.align)
        {
          default:
            break;
          case AlignRight:
            y_offset = 2 * c->border + geometry.height - width;
            break;
          case AlignCenter:
            y_offset = (geometry.height - width) / 2;
            break;
        }
        simplewindow_move_resize(c->titlebar.sw,
                                 geometry.x,
                                 geometry.y + y_offset,
                                 c->titlebar.sw->geometry.width,
                                 width);
        break;
      case Right:
        if(!c->titlebar.width)
            width = geometry.height + 2 * c->border;
        else
            width = MIN(c->titlebar.width, geometry.height);
        switch(c->titlebar.align)
        {
          default:
            break;
          case AlignRight:
            y_offset = 2 * c->border + geometry.height - width;
            break;
          case AlignCenter:
            y_offset = (geometry.height - width) / 2;
            break;
        }
        simplewindow_move_resize(c->titlebar.sw,
                                 geometry.x + geometry.width
                                     - c->titlebar.sw->geometry.width + 2 * c->border,
                                 geometry.y + y_offset,
                                 c->titlebar.sw->geometry.width,
                                 width);
        break;
    }

    titlebar_draw(c);
}

void
titlebar_position_set(titlebar_t *t, Position p)
{
    if(!t->sw)
        return;

    if((t->position = p))
        xcb_map_window(globalconf.connection, t->sw->window);
    else
        xcb_unmap_window(globalconf.connection, t->sw->window);
}

/** Toggle the visibility of the focused window's titlebar.
 * \param screen screen number (unused)
 * \param arg unused argument
 * \ingroup ui_callback
 */
void
uicb_client_toggletitlebar(int screen __attribute__ ((unused)), char *arg __attribute__ ((unused)))
{
    Client *c = globalconf.focus->client;

    if(!c || !c->titlebar.sw)
        return;

    if(!c->titlebar.position)
        titlebar_position_set(&c->titlebar, c->titlebar.dposition);
    else
        titlebar_position_set(&c->titlebar, Off);

    if(c->isfloating || layout_get_current(screen)->arrange == layout_floating)
        titlebar_update_geometry_floating(c);
    else
        globalconf.screens[c->screen].need_arrange = true;
}

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