/**
 * Navit, a modular navigation system.
 * Copyright (C) 2005-2010 Navit Team
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * 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.
 */
// style with: clang-format -style=WebKit -i *

#include <QQmlApplicationEngine>
#include <QQmlContext>

#include <glib.h>

extern "C" {
#include "item.h" /* needs to be first, as attr.h depends on it */

#include "attr.h"
#include "bookmarks.h"
#include "callback.h"
#include "color.h"
#include "command.h"
#include "config.h"
#include "coord.h"
#include "coord.h"
#include "country.h"
#include "debug.h"
#include "event.h"

#include "point.h" /* needs to be before graphics.h */

#include "graphics.h"
#include "gui.h"
#include "keys.h"
#include "map.h"
#include "mapset.h"
#include "navit.h"
#include "plugin.h"
#include "route.h"
#include "search.h"
#include "track.h"
#include "transform.h"
#include "vehicle.h"
#include "xmlconfig.h"

#include "layout.h"
}
struct gui_priv {
    /* navit internal handle */
    struct navit* nav;
    /* gui handle */
    struct gui* gui;

    /* attributes given to us */
    struct attr attributes;

    /* list of callbacks to navit */
    struct callback_list* callbacks;
    /* own callbacks *
     * TODO: Why do we need them as members? */
    struct callback* button_cb;
    struct callback* motion_cb;
    struct callback* resize_cb;
    struct callback* keypress_cb;
    struct callback* window_closed_cb;

    /* current graphics */
    struct graphics* gra;
    /* root window */
    struct window* win;
    /* navit root widget dimesnions */
    int w;
    int h;

    /* Qt application instance */
    QQmlApplicationEngine* engine;
    QObject* loader; /* Loader QML component to load our QML parts to the QML engine */

    class Backend* backend;

    /* configuration */
    int menu_on_map_click;
};

#include "backend.h"

static void gui_qt5_qml_button(void* data, int pressed, int button, struct point* p) {
    struct gui_priv* gui_priv = (struct gui_priv*)data;

    /* check if navit wants to handle this */
    if (!navit_handle_button(gui_priv->nav, pressed, button, p, NULL)) {
        dbg(lvl_debug, "navit has handled button");
        return;
    }
    dbg(lvl_debug, "enter %d %d", pressed, button);

    /* check if user requested menu */
    if (button == 1 && gui_priv->menu_on_map_click) {
        dbg(lvl_debug, "navit wants us to enter menu");
        /*TODO: want to emit a signal somewhere? */
        gui_priv->backend->showMenu(p);
    }
}

static void gui_qt5_qml_motion(void* data, struct point* p) {
    struct gui_priv* gui_priv = (struct gui_priv*)data;
    dbg(lvl_debug, "enter (%d, %d)", p->x, p->y);
    /* forward this to navit  */
    navit_handle_motion(gui_priv->nav, p);
}

static void gui_qt5_qml_resize(void* data, int w, int h) {
    struct gui_priv* gui_priv = (struct gui_priv*)data;
    dbg(lvl_debug, "enter");
    /* forward this to navit */
    navit_handle_resize(gui_priv->nav, w, h);
}

static void gui_qml_keypress(void* data, char* key) {
    struct gui_priv* this_ = (struct gui_priv*)data;
    int w, h;
    struct point p;
    transform_get_size(navit_get_trans(this_->nav), &w, &h);
    switch (*key) {
    case NAVIT_KEY_UP:
        dbg(lvl_debug, "got KEY_UP");
        p.x = w / 2;
        p.y = 0;
        navit_set_center_screen(this_->nav, &p, 1);
        break;
    case NAVIT_KEY_DOWN:
        p.x = w / 2;
        p.y = h;
        navit_set_center_screen(this_->nav, &p, 1);
        break;
    case NAVIT_KEY_LEFT:
        p.x = 0;
        p.y = h / 2;
        navit_set_center_screen(this_->nav, &p, 1);
        break;
    case NAVIT_KEY_RIGHT:
        p.x = w;
        p.y = h / 2;
        navit_set_center_screen(this_->nav, &p, 1);
        break;
    case NAVIT_KEY_ZOOM_IN:
        dbg(lvl_debug, "got ZOOM_IN");
        navit_zoom_in(this_->nav, 2, NULL);
        break;
    case NAVIT_KEY_ZOOM_OUT:
        navit_zoom_out(this_->nav, 2, NULL);
        break;
    case NAVIT_KEY_RETURN:
    case NAVIT_KEY_MENU:
        p.x = w / 2;
        p.y = h / 2;
        break;
    }

    return;
}

static int gui_qt5_qml_set_graphics(struct gui_priv* gui_priv, struct graphics* gra) {
    struct transformation* trans;
    dbg(lvl_debug, "enter");

    /* get navit transition */
    trans = navit_get_trans(gui_priv->nav);

    /* Tell navit to ignore events from graphics. We will hook the ones being supported. */
    navit_ignore_graphics_events(gui_priv->nav, 1);

    /* remeber graphics */
    gui_priv->gra = gra;

    /* hook button callback */
    gui_priv->button_cb = callback_new_attr_1(callback_cast(gui_qt5_qml_button), attr_button, gui_priv);
    graphics_add_callback(gra, gui_priv->button_cb);

    /* hook motion callback */
    gui_priv->motion_cb = callback_new_attr_1(callback_cast(gui_qt5_qml_motion), attr_motion, gui_priv);
    graphics_add_callback(gra, gui_priv->motion_cb);

    gui_priv->keypress_cb = callback_new_attr_1(callback_cast(gui_qml_keypress), attr_keypress, gui_priv);
    graphics_add_callback(gra, gui_priv->keypress_cb);

    /* hook resize callback. Will be called imediately! */
    gui_priv->resize_cb = callback_new_attr_1(callback_cast(gui_qt5_qml_resize), attr_resize, gui_priv);
    graphics_add_callback(gra, gui_priv->resize_cb);

    /* get main navit window */
    gui_priv->win = (struct window*)graphics_get_data(gra, "window");
    if (!gui_priv->win) {
        dbg(lvl_error, "failed to obtain window from graphics plugin, cannot set graphics");
        return 1;
    }

    /* expect to have qt5 graphics. So get the qml engine prepared by graphics */
    gui_priv->engine = (QQmlApplicationEngine*)graphics_get_data(gra, "engine");
    if (gui_priv->engine == NULL) {
        dbg(lvl_error, "Graphics doesn't seem to be qt5, or doesn't have QML. Cannot set graphics");
        return 1;
    }

    gui_priv->backend = new Backend();
    gui_priv->backend->set_navit(gui_priv->nav);
    gui_priv->backend->set_engine(gui_priv->engine);

    gui_priv->engine->rootContext()->setContextProperty("backend", gui_priv->backend);
    // gui_priv->engine->rootContext()->setContextProperty("myModel", QVariant::fromValue(dataList));

    /* find the loader component */
    gui_priv->loader = gui_priv->engine->rootObjects().value(0)->findChild<QObject*>("navit_loader");
    if (gui_priv->loader != NULL) {
        dbg(lvl_debug, "navit_loader found");
        /* load our root window into the loader component */
        gui_priv->loader->setProperty("source", "qrc:///skins/modern/main.qml");
    }

    transform_get_size(trans, &gui_priv->w, &gui_priv->h);
    dbg(lvl_debug, "navit provided geometry: (%d, %d)", gui_priv->w, gui_priv->h);

    /* Was resize callback already issued? */
    //    if (navit_get_ready(gui_priv->nav) & 2)
    //        gui_internal_setup(this);

    /* allow navit to draw */
    navit_draw(gui_priv->nav);

    return 0;
}

static int gui_qt5_qml_get_attr(struct gui_priv* gui_priv, enum attr_type type, struct attr* attr) {
    dbg(lvl_debug, "enter");
    return 1;
}

static int gui_qt5_qml_set_attr(struct gui_priv* gui_priv, struct attr* attr) {
    dbg(lvl_debug, "enter");
    return 1;
}

struct gui_methods gui_qt5_qml_methods = {
    NULL,
    NULL,
    gui_qt5_qml_set_graphics,
    NULL,
    NULL,
    NULL,
    NULL,
    gui_qt5_qml_get_attr,
    NULL,
    gui_qt5_qml_set_attr,
};

static struct gui_priv* gui_qt5_qml_new(struct navit* nav, struct gui_methods* meth, struct attr** attrs,
                                        struct gui* gui) {
    struct gui_priv* gui_priv;
    struct attr* attr;

    dbg(lvl_debug, "enter");

    /* tell navit our methods */
    *meth = gui_qt5_qml_methods;

    /* allocate gui private structure */
    gui_priv = g_new0(struct gui_priv, 1);

    /* default config */
    gui_priv->menu_on_map_click = 1;

    /* read config */
    if ((attr = attr_search(attrs, attr_menu_on_map_click)))
        gui_priv->menu_on_map_click = attr->u.num;

    /* remember navit internal handle */
    gui_priv->nav = nav;
    /* remember our gui handle */
    gui_priv->gui = gui;

    /* remember the attributes given to us */
    gui_priv->attributes.type = attr_gui;
    gui_priv->attributes.u.gui = gui;

    /* create new callbacks */
    gui_priv->callbacks = callback_list_new();

    /* return self */
    return gui_priv;
}

void plugin_init(void) {
    Q_INIT_RESOURCE(gui_qt5_qml);
    plugin_register_category_gui("qt5_qml", gui_qt5_qml_new);
}