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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2017 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>

#include "button.h"
#include "container.h"
#include <cx/allocator.h>
#include "../common/context.h"
#include "../common/object.h"

void ui_button_set_icon_name(GtkWidget *button, const char *icon) {
    if(!icon) {
        return;
    }
    
#ifdef UI_GTK4
    gtk_button_set_icon_name(GTK_BUTTON(button), icon);
#else
#if GTK_CHECK_VERSION(2, 6, 0)
    GtkWidget *image = gtk_image_new_from_icon_name(icon, GTK_ICON_SIZE_BUTTON);
    if(image) {
        gtk_button_set_image(GTK_BUTTON(button), image);
    }
#else
    // TODO
#endif
#endif
}

GtkWidget* ui_create_button(
        UiObject *obj,
        const char *label,
        const char *icon,
        ui_callback onclick,
        void *userdata,
        int event_value,
        bool activate_event)
{
    GtkWidget *button = gtk_button_new_with_label(label);
    ui_button_set_icon_name(button, icon);
    
    if(onclick) {
        UiEventData *event = malloc(sizeof(UiEventData));
        event->obj = obj;
        event->userdata = userdata;
        event->callback = onclick;
        event->value = event_value;
        event->customdata = NULL;

        g_signal_connect(
                button,
                "clicked",
                G_CALLBACK(ui_button_clicked),
                event);
        g_signal_connect(
                button,
                "destroy",
                G_CALLBACK(ui_destroy_userdata),
                event);
        if(activate_event) {
            g_signal_connect(
                button,
                "activate",
                G_CALLBACK(ui_button_clicked),
                event);
        }
    }
    
    return button;
}

UIWIDGET ui_button_create(UiObject *obj, UiButtonArgs args) {
    UiObject* current = uic_current_obj(obj);
    GtkWidget *button = ui_create_button(obj, args.label, args.icon, args.onclick, args.onclickdata, 0, FALSE);
    ui_set_name_and_style(button, args.name, args.style_class);
    ui_set_widget_groups(obj->ctx, button, args.groups);
    UI_APPLY_LAYOUT1(current, args);
    current->container->add(current->container, button, FALSE);
    return button;
}


void ui_button_clicked(GtkWidget *widget, UiEventData *event) {
    UiEvent e;
    e.obj = event->obj;
    e.window = event->obj->window;
    e.document = event->obj->ctx->document;
    e.eventdata = NULL;
    e.intval = event->value;
    event->callback(&e, event->userdata);
}

int64_t ui_toggle_button_get(UiInteger *integer) {
    GtkToggleButton *button = integer->obj;
    integer->value = (int)gtk_toggle_button_get_active(button);
    return integer->value;
}

void ui_toggle_button_set(UiInteger *integer, int64_t value) {
    GtkToggleButton *button = integer->obj;
    integer->value = value;
    gtk_toggle_button_set_active(button, value != 0 ? TRUE : FALSE);
}

void ui_toggled_obs(void *widget, UiVarEventData *event) {
    UiInteger *i = event->var->value;
    UiEvent e;
    e.obj = event->obj;
    e.window = event->obj->window;
    e.document = event->obj->ctx->document;
    e.eventdata = event->var->value;
    e.intval = i->get(i);  
    
    ui_notify_evt(i->observers, &e);
}

static void ui_toggled_callback(GtkToggleButton *widget, UiEventData *event) {
    UiEvent e;
    e.obj = event->obj;
    e.window = event->obj->window;
    e.document = event->obj->ctx->document;
    e.eventdata = NULL;
    e.intval = gtk_toggle_button_get_active(widget);
    event->callback(&e, event->userdata);    
}

static void ui_togglebutton_enable_state_callback(GtkToggleButton *widget, UiEventData *event) {
    if(gtk_toggle_button_get_active(widget)) {
        ui_set_group(event->obj->ctx, event->value);
    } else {
        ui_unset_group(event->obj->ctx, event->value);
    }
}

void ui_setup_togglebutton(
        UiObject *obj,
        GtkWidget *togglebutton,
        const char *label,
        const char *icon,
        const char *varname,
        UiInteger *value,
        ui_callback onchange,
        void *onchangedata,
        int enable_state)
{
    if(label) {
        gtk_button_set_label(GTK_BUTTON(togglebutton), label);
    }
    ui_button_set_icon_name(togglebutton, icon);
    
    ui_bind_togglebutton(
            obj,
            togglebutton,
            ui_toggle_button_get,
            ui_toggle_button_set,
            varname,
            value,
            (ui_toggled_func)ui_toggled_callback,
            onchange,
            onchangedata,
            (ui_toggled_func)ui_togglebutton_enable_state_callback,
            enable_state
            );
}

void ui_bind_togglebutton(
        UiObject *obj,
        GtkWidget *widget,
        int64_t (*getfunc)(UiInteger*),
        void (*setfunc)(UiInteger*, int64_t),
        const char *varname,
        UiInteger *value,
        void (*toggled_callback)(void*, void*),
        ui_callback onchange,
        void *onchangedata,
        void (*enable_state_func)(void*, void*),
        int enable_state)
{
    UiObject* current = uic_current_obj(obj);
    UiVar* var = uic_widget_var(obj->ctx, current->ctx, value, varname, UI_VAR_INTEGER);
    if (var) {
        UiInteger* value = (UiInteger*)var->value;
        value->obj = widget;
        value->get = getfunc;
        value->set = setfunc;
        
        UiVarEventData *event = malloc(sizeof(UiVarEventData));
        event->obj = obj;
        event->var = var;
        event->observers = NULL;
        event->callback = NULL;
        event->userdata = NULL;

        g_signal_connect(
                widget,
                "toggled",
                G_CALLBACK(ui_toggled_obs),
                event);
        g_signal_connect(
                widget,
                "destroy",
                G_CALLBACK(ui_destroy_vardata),
                event);
    }
    
    if(onchange) {
        UiEventData *event = malloc(sizeof(UiEventData));
        event->obj = obj;
        event->userdata = onchangedata;
        event->callback = onchange;
        event->value = 0;
        event->customdata = NULL;
        
        g_signal_connect(
                widget,
                "toggled",
                G_CALLBACK(toggled_callback),
                event);
        g_signal_connect(
                widget,
                "destroy",
                G_CALLBACK(ui_destroy_userdata),
                event);
    }
    
    if(enable_state > 0) {
        UiEventData *event = malloc(sizeof(UiEventData));
        event->obj = obj;
        event->userdata = NULL;
        event->callback = NULL;
        event->value = enable_state;
        event->customdata = NULL;
        
        g_signal_connect(
                widget,
                "toggled",
                G_CALLBACK(enable_state_func),
                event);
        g_signal_connect(
                widget,
                "destroy",
                G_CALLBACK(ui_destroy_userdata),
                event);
    }
}

static UIWIDGET togglebutton_create(UiObject *obj, GtkWidget *widget, UiToggleArgs args) {
    UiObject* current = uic_current_obj(obj);
    
    ui_setup_togglebutton(
            current,
            widget,
            args.label,
            args.icon,
            args.varname,
            args.value,
            args.onchange,
            args.onchangedata,
            args.enable_group);
    ui_set_name_and_style(widget, args.name, args.style_class);
    ui_set_widget_groups(obj->ctx, widget, args.groups);
    
    UI_APPLY_LAYOUT1(current, args);
    current->container->add(current->container, widget, FALSE);
    
    return widget;
}

UIWIDGET ui_togglebutton_create(UiObject* obj, UiToggleArgs args) {
    return togglebutton_create(obj, gtk_toggle_button_new(), args);
}

#if GTK_MAJOR_VERSION >= 4

int64_t ui_check_button_get(UiInteger *integer) {
    GtkCheckButton *button = integer->obj;
    integer->value = (int)gtk_check_button_get_active(button);
    return integer->value;
}

void ui_check_button_set(UiInteger *integer, int64_t value) {
    GtkCheckButton *button = integer->obj;
    integer->value = value;
    gtk_check_button_set_active(button, value != 0 ? TRUE : FALSE);
}

static void ui_checkbox_callback(GtkCheckButton *widget, UiEventData *event) {
    UiEvent e;
    e.obj = event->obj;
    e.window = event->obj->window;
    e.document = event->obj->ctx->document;
    e.eventdata = NULL;
    e.intval = gtk_check_button_get_active(widget);
    event->callback(&e, event->userdata);    
}

static void ui_checkbox_enable_state(GtkCheckButton *widget, UiEventData *event) {
    if(gtk_check_button_get_active(widget)) {
        ui_set_group(event->obj->ctx, event->value);
    } else {
        ui_unset_group(event->obj->ctx, event->value);
    }
}

UIWIDGET ui_checkbox_create(UiObject* obj, UiToggleArgs args) {
    UiObject* current = uic_current_obj(obj);
    
    GtkWidget *widget = gtk_check_button_new_with_label(args.label); 
    ui_bind_togglebutton(
            obj,
            widget,
            ui_check_button_get,
            ui_check_button_set,
            args.varname,
            args.value,
            (ui_toggled_func)ui_checkbox_callback,
            args.onchange,
            args.onchangedata,
            (ui_toggled_func)ui_checkbox_enable_state,
            args.enable_group);
    
    ui_set_name_and_style(widget, args.name, args.style_class);
    ui_set_widget_groups(obj->ctx, widget, args.groups);
    
    UI_APPLY_LAYOUT1(current, args);
    current->container->add(current->container, widget, FALSE);
    
    return widget;
}

#else
UIWIDGET ui_checkbox_create(UiObject* obj, UiToggleArgs args) {
    return togglebutton_create(obj, gtk_check_button_new(), args);
}
#endif

UIWIDGET ui_switch_create(UiObject* obj, UiToggleArgs args) {
#ifdef UI_GTK3
    return NULL; // TODO
#else
    return ui_checkbox_create(obj, args);
#endif
}

#if GTK_MAJOR_VERSION >= 4
#define RADIOBUTTON_NEW(group, label) gtk_check_button_new_with_label(label)
#define RADIOBUTTON_SET_GROUP(button, group) 
#define RADIOBUTTON_GET_GROUP(button) GTK_CHECK_BUTTON(button)
#define RADIOBUTTON_GET_ACTIVE(button) gtk_check_button_get_active(GTK_CHECK_BUTTON(button))
#else
#define RADIOBUTTON_NEW(group, label) gtk_radio_button_new_with_label(group, label)
#define RADIOBUTTON_SET_GROUP(button, group) /* noop */
#define RADIOBUTTON_GET_GROUP(button) gtk_radio_button_get_group(GTK_RADIO_BUTTON(button))
#define RADIOBUTTON_GET_ACTIVE(button) gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(button))
#endif

static void radiobutton_toggled(void *widget, UiEventData *event) {
    UiEvent e;
    e.obj = event->obj;
    e.window = event->obj->window;
    e.document = event->obj->ctx->document;
    e.eventdata = NULL;
    e.intval = RADIOBUTTON_GET_ACTIVE(widget);
    event->callback(&e, event->userdata);    
}

typedef struct UiRadioButtonData {
    UiInteger *value;
    UiVarEventData *eventdata;
    UiBool first;
} UiRadioButtonData;

static void destroy_radiobutton(GtkWidget *w, UiRadioButtonData *data) {
    ui_destroy_vardata(w, data->eventdata);
    if(data->first) {
        g_slist_free(data->value->obj);
        data->value->obj = NULL;
        data->value->get = NULL;
        data->value->set = NULL;
    }
    free(data);
}

UIWIDGET ui_radiobutton_create(UiObject *obj, UiToggleArgs args) {
    UiObject* current = uic_current_obj(obj);
    
    GSList *rg = NULL;
    UiInteger *rgroup;
    
    UiVar* var = uic_widget_var(obj->ctx, current->ctx, args.value, args.varname, UI_VAR_INTEGER);
    
    UiBool first = FALSE;
    if(var) {
        rgroup = var->value;
        rg = rgroup->obj;
        if(!rg) {
            first = TRUE;
        }
    }
    
    GtkWidget *rbutton = RADIOBUTTON_NEW(rg, args.label); 
    ui_set_name_and_style(rbutton, args.name, args.style_class);
    ui_set_widget_groups(obj->ctx, rbutton, args.groups);
    if(rgroup) {
#if GTK_MAJOR_VERSION >= 4
        if(rg) {
            gtk_check_button_set_group(GTK_CHECK_BUTTON(rbutton), rg->data);
        }
        rg = g_slist_prepend(rg, rbutton);
#else
        gtk_radio_button_set_group(GTK_RADIO_BUTTON(rbutton), rg);
        rg = gtk_radio_button_get_group(GTK_RADIO_BUTTON(rbutton));
#endif
        
        rgroup->obj = rg;
        rgroup->get = ui_radiobutton_get;
        rgroup->set = ui_radiobutton_set;
        
        ui_radiobutton_set(rgroup, rgroup->value);
        
        UiVarEventData *event = malloc(sizeof(UiVarEventData));
        event->obj = obj;
        event->var = var;
        event->observers = NULL;
        event->callback = NULL;
        event->userdata = NULL;
        
        UiRadioButtonData *rbdata = malloc(sizeof(UiRadioButtonData));
        rbdata->value = rgroup;
        rbdata->eventdata = event;
        rbdata->first = first;
        
        g_signal_connect(
                rbutton,
                "toggled",
                G_CALLBACK(ui_radio_obs),
                event);
        g_signal_connect(
                rbutton,
                "destroy",
                G_CALLBACK(destroy_radiobutton),
                rbdata);
    }
    
    if(args.onchange) {
        UiEventData *event = malloc(sizeof(UiEventData));
        event->obj = obj;
        event->userdata = args.onchangedata;
        event->callback = args.onchange;
        event->value = 0;
        event->customdata = NULL;
        
        g_signal_connect(
                rbutton,
                "toggled",
                G_CALLBACK(radiobutton_toggled),
                event);
        g_signal_connect(
                rbutton,
                "destroy",
                G_CALLBACK(ui_destroy_userdata),
                event);
    }
    
    UI_APPLY_LAYOUT1(current, args);
    current->container->add(current->container, rbutton, FALSE);
    
    return rbutton;
}

void ui_radio_obs(GtkToggleButton *widget, UiVarEventData *event) {
    UiInteger *i = event->var->value;
    
    UiEvent e;
    e.obj = event->obj;
    e.window = event->obj->window;
    e.document = event->obj->ctx->document;
    e.eventdata = NULL;
    e.intval = i->get(i);
    
    ui_notify_evt(i->observers, &e);
}

#if GTK_MAJOR_VERSION >= 4
int64_t ui_radiobutton_get(UiInteger *value) {
    int selection = 0;
    GSList *ls = value->obj;
    int i = 0;
    guint len = g_slist_length(ls);
    while(ls) {
        if(gtk_check_button_get_active(GTK_CHECK_BUTTON(ls->data))) {
            selection = len - i - 1;
            break;
        }
        ls = ls->next;
        i++;
    }
    
    value->value = selection;
    return selection;
}

void ui_radiobutton_set(UiInteger *value, int64_t i) {
    GSList *ls = value->obj;
    int s = g_slist_length(ls) - 1 - i;
    int j = 0;
    while(ls) {
        if(j == s) {
            gtk_check_button_set_active(GTK_CHECK_BUTTON(ls->data), TRUE);
            break;
        }
        ls = ls->next;
        j++;
    }
    
    value->value = i;
}
#else
int64_t ui_radiobutton_get(UiInteger *value) {
    int selection = 0;
    GSList *ls = value->obj;
    int i = 0;
    guint len = g_slist_length(ls);
    while(ls) {
        if(gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(ls->data))) {
            selection = len - i - 1;
            break;
        }
        ls = ls->next;
        i++;
    }
    
    value->value = selection;
    return selection;
}

void ui_radiobutton_set(UiInteger *value, int64_t i) {
    GSList *ls = value->obj;
    int s = g_slist_length(ls) - 1 - i;
    int j = 0;
    while(ls) {
        if(j == s) {
            gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(ls->data), TRUE);
            break;
        }
        ls = ls->next;
        j++;
    }
    
    value->value = i;
}
#endif