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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 <string.h>
#include <stdarg.h>

#include "../common/context.h"
#include "../common/object.h"
#include "container.h"

#include "tree.h"
#include "image.h"


void* ui_strmodel_getvalue(void *elm, int column) {
    return column == 0 ? elm : NULL;
}

static GtkListStore* create_list_store(UiList *list, UiModel *model) {
    int columns = model->columns;
    GType types[2*columns];
    int c = 0;
    for(int i=0;i<columns;i++,c++) {
        switch(model->types[i]) {
            case UI_STRING: 
            case UI_STRING_FREE: types[c] = G_TYPE_STRING; break;
            case UI_INTEGER: types[c] = G_TYPE_INT; break;
            case UI_ICON: types[c] = G_TYPE_OBJECT; break;
            case UI_ICON_TEXT: 
            case UI_ICON_TEXT_FREE: {
                types[c] = G_TYPE_OBJECT;
                types[++c] = G_TYPE_STRING;
            }
        }
    }
    
    GtkListStore *store = gtk_list_store_newv(c, types);
    
    if(list) {
        void *elm = list->first(list);
	while(elm) {
            // insert new row
            GtkTreeIter iter;
            gtk_list_store_insert (store, &iter, -1);
            
            // set column values
            int c = 0;
            for(int i=0;i<columns;i++,c++) {
                void *data = model->getvalue(elm, c);
                
                GValue value = G_VALUE_INIT;
                switch(model->types[i]) {
                    case UI_STRING: 
                    case UI_STRING_FREE: {
                        g_value_init(&value, G_TYPE_STRING);
                        g_value_set_string(&value, data);
                        if(model->types[i] == UI_STRING_FREE) {
                            free(data);
                        }
                        break;
                    }
                    case UI_INTEGER: {
                        g_value_init(&value, G_TYPE_INT);
                        int *intptr = data;
                        g_value_set_int(&value, *intptr);
                        break;
                    }
                    case UI_ICON: {
                        g_value_init(&value, G_TYPE_OBJECT);
                        UiIcon *icon = data;
#if GTK_MAJOR_VERSION >= 4
                        g_value_set_object(&value, icon->info); // TODO: does this work?
#else
                        if(!icon->pixbuf && icon->info) {
                            GError *error = NULL;
                            GdkPixbuf *pixbuf = gtk_icon_info_load_icon(icon->info, &error);
                            icon->pixbuf = pixbuf;
                        }
                        
                        if(icon->pixbuf) {
                            g_value_set_object(&value, icon->pixbuf);
                        }
#endif
                        break;
                    }
                    case UI_ICON_TEXT:
                    case UI_ICON_TEXT_FREE: {
                        UiIcon *icon = data;
                        char *str = model->getvalue(elm, c);
#if GTK_MAJOR_VERSION >= 4
                        GValue iconvalue = G_VALUE_INIT;
                        g_value_init(&iconvalue, G_TYPE_OBJECT);
                        g_value_set_object(&iconvalue, icon->info);
                        gtk_list_store_set_value(store, &iter, c, &iconvalue);
#else
                        GValue pixbufvalue = G_VALUE_INIT;
                        if(!icon->pixbuf && icon->info) {
                            GError *error = NULL;
                            GdkPixbuf *pixbuf = gtk_icon_info_load_icon(icon->info, &error);
                            icon->pixbuf = pixbuf;
                        }
                        g_value_init(&pixbufvalue, G_TYPE_OBJECT);
                        g_value_set_object(&pixbufvalue, icon->pixbuf);
                        gtk_list_store_set_value(store, &iter, c, &pixbufvalue);
#endif
                        c++;
                        g_value_init(&value, G_TYPE_STRING);
                        g_value_set_string(&value, str);
                        if(model->types[i] == UI_ICON_TEXT_FREE) {
                            free(str);
                        }
                        break;
                    }
                }
                
                gtk_list_store_set_value(store, &iter, c, &value);
            }
            
            // next row
            elm = list->next(list);
        }
    }
    
    return store;
}


UIWIDGET ui_listview_create(UiObject *obj, UiListArgs args) {
    UiObject* current = uic_current_obj(obj);
    
    // create treeview
    GtkWidget *view = gtk_tree_view_new();
    GtkCellRenderer *renderer = gtk_cell_renderer_text_new();
    GtkTreeViewColumn *column = gtk_tree_view_column_new_with_attributes(NULL, renderer, "text", 0, NULL);
    gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);
    
    gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(view), FALSE);
#ifdef UI_GTK3
#if GTK_MINOR_VERSION >= 8
    gtk_tree_view_set_activate_on_single_click(GTK_TREE_VIEW(view), TRUE);
#else
    // TODO: implement for older gtk3
#endif
#else
    // TODO: implement for gtk2
#endif
    
    UiModel *model = ui_model(obj->ctx, UI_STRING, "", -1);
    model->getvalue = args.getvalue;
    
    UiVar* var = uic_widget_var(obj->ctx, current->ctx, args.list, args.varname, UI_VAR_LIST);
    
    UiList *list = var ? var->value : NULL;
    GtkListStore *listmodel = create_list_store(list, model);
    gtk_tree_view_set_model(GTK_TREE_VIEW(view), GTK_TREE_MODEL(listmodel));
    
    UiListView *listview = malloc(sizeof(UiListView));
    listview->obj = obj;
    listview->widget = view;
    listview->var = var;
    listview->model = model;
    g_signal_connect(
                view,
                "destroy",
                G_CALLBACK(ui_listview_destroy),
                listview);
    
    // bind var
    list->update = ui_listview_update;
    list->getselection = ui_listview_getselection;
    list->obj = listview;
    
    // add callback
    if(args.onactivate) {
        UiTreeEventData *event = ui_malloc(obj->ctx, sizeof(UiTreeEventData));
        event->obj = obj;
        event->activatedata = args.onactivatedata;
        event->activate = args.onactivate;
        event->selection = NULL;

        g_signal_connect(
                view,
                "row-activated",
                G_CALLBACK(ui_listview_activate_event),
                event);
    }
    
    // add widget to the current container
    GtkWidget *scroll_area = SCROLLEDWINDOW_NEW();
    gtk_scrolled_window_set_policy(
            GTK_SCROLLED_WINDOW(scroll_area),
            GTK_POLICY_AUTOMATIC,
            GTK_POLICY_AUTOMATIC); // GTK_POLICY_ALWAYS  
    SCROLLEDWINDOW_SET_CHILD(scroll_area, view);
    
    UI_APPLY_LAYOUT1(current, args);
    current->container->add(current->container, scroll_area, FALSE);
    
    // ct->current should point to view, not scroll_area, to make it possible
    // to add a context menu
    current->container->current = view;
    
    return scroll_area;
}

/*
static void drag_begin(GtkWidget *widget, GdkDragContext *context, gpointer udata) {
    printf("drag begin\n");
    
}

static void drag_end(
        GtkWidget *widget,
        GdkDragContext *context,
        guint time,
        gpointer udata)
{
    printf("drag end\n");
    
}
*/

/*
static GtkTargetEntry targetentries[] =
    {
      { "STRING",        0, 0 },
      { "text/plain",    0, 1 },
      { "text/uri-list", 0, 2 },
    };
*/

UIWIDGET ui_table_create(UiObject *obj, UiListArgs args) {
    UiObject* current = uic_current_obj(obj);
    
    // create treeview
    GtkWidget *view = gtk_tree_view_new();
    
    UiModel *model = args.model;
    int columns = model ? model->columns : 0;
    
    int addi = 0;
    for(int i=0;i<columns;i++) {
        GtkTreeViewColumn *column = NULL;
        if(model->types[i] == UI_ICON_TEXT) {
            column = gtk_tree_view_column_new();
            gtk_tree_view_column_set_title(column, model->titles[i]);
            
            GtkCellRenderer *iconrenderer = gtk_cell_renderer_pixbuf_new();
            GtkCellRenderer *textrenderer = gtk_cell_renderer_text_new();
            
            gtk_tree_view_column_pack_end(column, textrenderer, TRUE);
            gtk_tree_view_column_pack_start(column, iconrenderer, FALSE);
            
            
            gtk_tree_view_column_add_attribute(column, iconrenderer, "pixbuf", i);
            gtk_tree_view_column_add_attribute(column, textrenderer, "text", i+1);
            
            addi++;
        } else if (model->types[i] == UI_ICON) {
            GtkCellRenderer *iconrenderer = gtk_cell_renderer_pixbuf_new();
            column = gtk_tree_view_column_new_with_attributes(
                model->titles[i],
                iconrenderer,
                "pixbuf",
                i + addi,
                NULL);
        } else {
            GtkCellRenderer *renderer = gtk_cell_renderer_text_new();
            column = gtk_tree_view_column_new_with_attributes(
                model->titles[i],
                renderer,
                "text",
                i + addi,
                NULL);
        }
        gtk_tree_view_column_set_resizable(column, TRUE);
        gtk_tree_view_append_column(GTK_TREE_VIEW(view), column);
    }
    
    //gtk_tree_view_set_headers_visible(GTK_TREE_VIEW(view), FALSE);
#ifdef UI_GTK3
    //gtk_tree_view_set_activate_on_single_click(GTK_TREE_VIEW(view), TRUE);
#else
    
#endif
    
    UiVar* var = uic_widget_var(obj->ctx, current->ctx, args.list, args.varname, UI_VAR_LIST);
    
    UiList *list = var ? var->value : NULL;
    GtkListStore *listmodel = create_list_store(list, model);
    gtk_tree_view_set_model(GTK_TREE_VIEW(view), GTK_TREE_MODEL(listmodel));
    
    //g_signal_connect(view, "drag-begin", G_CALLBACK(drag_begin), NULL);
    //g_signal_connect(view, "drag-end", G_CALLBACK(drag_end), NULL);
       
    // add TreeView as observer to the UiList to update the TreeView if the
    // data changes
    UiListView *tableview = malloc(sizeof(UiListView));
    tableview->obj = obj;
    tableview->widget = view;
    tableview->var = var;
    tableview->model = model;
    g_signal_connect(
                view,
                "destroy",
                G_CALLBACK(ui_listview_destroy),
                tableview);
    
    // bind var
    list->update = ui_listview_update;
    list->getselection = ui_listview_getselection;
    list->obj = tableview;
    
    // add callback
    UiTreeEventData *event = ui_malloc(obj->ctx, sizeof(UiTreeEventData));
    event->obj = obj;
    event->activate = args.onactivate;
    event->selection = args.onselection;
    event->activatedata = args.onactivatedata;
    event->selectiondata = args.onselectiondata;
    if(args.onactivate) {
        g_signal_connect(
                view,
                "row-activated",
                G_CALLBACK(ui_listview_activate_event),
                event);
    }
    if(args.onselection) {
        GtkTreeSelection *selection = gtk_tree_view_get_selection(
                GTK_TREE_VIEW(view));
        g_signal_connect(
                selection,
                "changed",
                G_CALLBACK(ui_listview_selection_event),
                event);
    }
    // TODO: destroy callback

    
    GtkTreeSelection *selection = gtk_tree_view_get_selection (GTK_TREE_VIEW(view));
    gtk_tree_selection_set_mode(selection, GTK_SELECTION_MULTIPLE);
    
    // add widget to the current container
    GtkWidget *scroll_area = SCROLLEDWINDOW_NEW();
    gtk_scrolled_window_set_policy(
            GTK_SCROLLED_WINDOW(scroll_area),
            GTK_POLICY_AUTOMATIC,
            GTK_POLICY_AUTOMATIC); // GTK_POLICY_ALWAYS  
    SCROLLEDWINDOW_SET_CHILD(scroll_area, view);
    
    UI_APPLY_LAYOUT1(current, args);
    current->container->add(current->container, scroll_area, FALSE);
    
    // ct->current should point to view, not scroll_area, to make it possible
    // to add a context menu
    current->container->current = view;
    
    return scroll_area;
}


GtkWidget* ui_get_tree_widget(UIWIDGET widget) {
    return SCROLLEDWINDOW_GET_CHILD(widget);
}

static char** targets2array(char *target0, va_list ap, int *nelm) {
    int al = 16;
    char **targets = calloc(16, sizeof(char*));
    targets[0] = target0;
    
    int i = 1;
    char *target;
    while((target = va_arg(ap, char*)) != NULL) {
        if(i >= al) {
            al *= 2;
            targets = realloc(targets, al*sizeof(char*));
        }
        targets[i] = target;
        i++;
    }
    
    *nelm = i;
    return targets;
}

/*
static GtkTargetEntry* targetstr2gtktargets(char **str, int nelm) {
    GtkTargetEntry *targets = calloc(nelm, sizeof(GtkTargetEntry));
    for(int i=0;i<nelm;i++) {
        targets[i].target = str[i];
    }
    return targets;
}
*/

void ui_table_dragsource(UIWIDGET tablewidget, int actions, char *target0, ...) { 
    va_list ap;
    va_start(ap, target0);
    int nelm;
    char **targets = targets2array(target0, ap, &nelm);
    va_end(ap);
    
    // disabled
    //ui_table_dragsource_a(tablewidget, actions, targets, nelm);
    
    free(targets);
}

/*
void ui_table_dragsource_a(UIWIDGET tablewidget, int actions, char **targets, int nelm) {
    GtkTargetEntry* t = targetstr2gtktargets(targets, nelm);
    gtk_tree_view_enable_model_drag_source(
            GTK_TREE_VIEW(ui_get_tree_widget(tablewidget)),
            GDK_BUTTON1_MASK,
            t,
            nelm,
            GDK_ACTION_COPY|GDK_ACTION_MOVE|GDK_ACTION_LINK);
    free(t);
}


void ui_table_dragdest(UIWIDGET tablewidget, int actions, char *target0, ...) {
    va_list ap;
    va_start(ap, target0);
    int nelm;
    char **targets = targets2array(target0, ap, &nelm);
    va_end(ap);
    ui_table_dragdest_a(tablewidget, actions, targets, nelm);
    free(targets);
}

void ui_table_dragdest_a(UIWIDGET tablewidget, int actions, char **targets, int nelm) {
    GtkTargetEntry* t = targetstr2gtktargets(targets, nelm);
    gtk_tree_view_enable_model_drag_dest(
            GTK_TREE_VIEW(ui_get_tree_widget(tablewidget)),
            t,
            nelm,
            GDK_ACTION_COPY|GDK_ACTION_MOVE|GDK_ACTION_LINK);
    free(t);
}
*/
 
void ui_listview_update(UiList *list, int i) {
    UiListView *view = list->obj;
    GtkListStore *store = create_list_store(list, view->model);
    gtk_tree_view_set_model(GTK_TREE_VIEW(view->widget), GTK_TREE_MODEL(store));
    g_object_unref(G_OBJECT(store));
    // TODO: free old model
}

UiListSelection ui_listview_getselection(UiList *list) {
    UiListView *view = list->obj;
    UiListSelection selection = ui_listview_selection(
            gtk_tree_view_get_selection(GTK_TREE_VIEW(view->widget)),
            NULL);
    return selection;
}

void ui_listview_destroy(GtkWidget *w, UiListView *v) {
    gtk_tree_view_set_model(GTK_TREE_VIEW(w), NULL);
    ui_destroy_boundvar(v->obj->ctx, v->var);
    // TODO: destroy model?
    free(v);
}

void ui_combobox_destroy(GtkWidget *w, UiListView *v) {
    gtk_combo_box_set_model(GTK_COMBO_BOX(w), NULL);
    ui_destroy_boundvar(v->obj->ctx, v->var);
    // TODO: destroy model?
    free(v);
}


void ui_listview_activate_event(
        GtkTreeView *treeview,
        GtkTreePath *path,
        GtkTreeViewColumn *column,
        UiTreeEventData *event)
{
    UiListSelection selection = ui_listview_selection(
            gtk_tree_view_get_selection(treeview),
            event);
    
    UiEvent e;
    e.obj = event->obj;
    e.window = event->obj->window;
    e.document = event->obj->ctx->document;
    e.eventdata = &selection;
    e.intval = selection.count > 0 ? selection.rows[0] : -1;
    event->activate(&e, event->activatedata);
    
    if(selection.count > 0) {
        free(selection.rows);
    }
}

void ui_listview_selection_event(
        GtkTreeSelection *treeselection,
        UiTreeEventData *event)
{
    UiListSelection selection = ui_listview_selection(treeselection, event);
    
    UiEvent e;
    e.obj = event->obj;
    e.window = event->obj->window;
    e.document = event->obj->ctx->document;
    e.eventdata = &selection;
    e.intval = selection.count > 0 ? selection.rows[0] : -1;
    event->selection(&e, event->selectiondata);
    
    if(selection.count > 0) {
        free(selection.rows);
    }
}

UiListSelection ui_listview_selection(
        GtkTreeSelection *selection,
        UiTreeEventData *event)
{
    GList *rows = gtk_tree_selection_get_selected_rows(selection, NULL);
    
    UiListSelection ls;
    ls.count = g_list_length(rows);
    ls.rows = calloc(ls.count, sizeof(int));
    GList *r = rows;
    int i = 0;
    while(r) {
        GtkTreePath *path = r->data;
        ls.rows[i] = ui_tree_path_list_index(path);
        r = r->next;
        i++;
    }
    return ls;
}

int ui_tree_path_list_index(GtkTreePath *path) {
    int depth = gtk_tree_path_get_depth(path);
    if(depth == 0) {
        fprintf(stderr, "UiError: treeview selection: depth == 0\n");
        return -1;
    }
    int *indices = gtk_tree_path_get_indices(path);
    return indices[depth - 1];
}


/* --------------------------- ComboBox ---------------------------  */

UIWIDGET ui_combobox_create(UiObject *obj, UiListArgs args) {
    UiObject* current = uic_current_obj(obj);
    
    UiModel *model = ui_model(obj->ctx, UI_STRING, "", -1);
    model->getvalue = args.getvalue;
    
    UiVar* var = uic_widget_var(obj->ctx, current->ctx, args.list, args.varname, UI_VAR_LIST);
    
    GtkWidget *combobox = ui_create_combobox(obj, model, var, args.onactivate, args.onactivatedata);
    UI_APPLY_LAYOUT1(current, args);
    current->container->add(current->container, combobox, FALSE);
    current->container->current = combobox;
    return combobox;
}

GtkWidget* ui_create_combobox(UiObject *obj, UiModel *model, UiVar *var, ui_callback f, void *udata) {
    GtkWidget *combobox = gtk_combo_box_new();
     
    UiListView *uicbox = malloc(sizeof(UiListView));
    uicbox->obj = obj;
    uicbox->widget = combobox;
    
    UiList *list = var ? var->value : NULL;
    GtkListStore *listmodel = create_list_store(list, model);
    
    if(listmodel) {
        gtk_combo_box_set_model(GTK_COMBO_BOX(combobox), GTK_TREE_MODEL(listmodel));
    }
    
    uicbox->var = var;
    uicbox->model = model;
    
    g_signal_connect(
                combobox,
                "destroy",
                G_CALLBACK(ui_combobox_destroy),
                uicbox);
    
    // bind var
    if(list) {
        list->update = ui_combobox_modelupdate;
        // TODO: combobox getselection
        list->obj = uicbox;
    }
    
    GtkCellRenderer *renderer = gtk_cell_renderer_text_new();
    gtk_cell_layout_pack_start(GTK_CELL_LAYOUT(combobox), renderer, TRUE);
    gtk_cell_layout_set_attributes(
            GTK_CELL_LAYOUT(combobox),
            renderer,
            "text",
            0,
            NULL);
    gtk_combo_box_set_active(GTK_COMBO_BOX(combobox), 0);
    
    // add callback
    if(f) {
        UiEventData *event = ui_malloc(obj->ctx, sizeof(UiEventData));
        event->obj = obj;
        event->userdata = udata;
        event->callback = f;
        event->value = 0;
        event->customdata = NULL;

        g_signal_connect(
                combobox,
                "changed",
                G_CALLBACK(ui_combobox_change_event),
                event);
    }
    
    return combobox;
}

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

void ui_combobox_modelupdate(UiList *list, int i) {
    UiListView *view = list->obj;
    GtkListStore *store = create_list_store(view->var->value, view->model);
    gtk_combo_box_set_model(GTK_COMBO_BOX(view->widget), GTK_TREE_MODEL(store));
}