#include <stdio.h>
#include <gtk-4.0/gtk/gtk.h>

#include "warm.h"
#include "cold.h"
#include "display.h"
#include "contain.h"
#include "texts.h"

//  https://docs.gtk.org/gtk4/visual_index.html  <  widgets gallery
//  https://docs.gtk.org/gtk4/section-text-widget.html
//  https://docs.gtk.org/gtk4/class.Widget.html#height-for-width-geometry-management
//  GTK_ORIENTATION_VERTICAL       GTK_ORIENTATION_HORIZONTAL


static struct TreeNode_t {gchar *text; struct TreeNode_t *child, *next;};

static struct TreeNode_t *create_tree_node (const gchar* text){
    struct TreeNode_t *node = g_malloc0 (sizeof(struct TreeNode_t));
    node->text = g_strdup(text);
    node->child = NULL;       //  if (0) printf("create_tree_node  %s\n", text);
    return node;
}

static void add_child_node (struct TreeNode_t *parent, struct TreeNode_t *child){
    if (parent->child) {
        struct TreeNode_t *cur = parent->child;
        while (cur && cur->next) {cur = cur->next;}
        cur->next = child;
    } else parent->child = child;
}

void on_experimental_tree_expander_toggled(GtkExpander *expander, gpointer user_data)
{
    // This is a conceptual callback for when an expander is toggled
    GtkTreeListRow *row = GTK_TREE_LIST_ROW(user_data);
    gboolean is_expanded = gtk_tree_list_row_get_expanded(row);
    gtk_tree_list_row_set_expanded(row, !is_expanded);
}

static void on_experimental_tree_bind_factory (GtkSignalListItemFactory *factory, GObject* object, gpointer user_data){
    GtkListItem *list_item = GTK_LIST_ITEM (object);
    GtkTreeListRow *row = gtk_list_item_get_item (list_item);
    if (row != NULL) {
        const gchar *text = gtk_string_object_get_string (GTK_STRING_OBJECT (gtk_tree_list_row_get_item (row)));
        GtkWidget *expander = gtk_list_item_get_child (list_item);
        gtk_expander_set_label (GTK_EXPANDER (expander), text);
        g_signal_handlers_disconnect_by_func(expander, G_CALLBACK(on_experimental_tree_expander_toggled), row);
        g_signal_connect(expander, "activate", G_CALLBACK(on_experimental_tree_expander_toggled), row);
        gtk_widget_set_margin_start(expander, gtk_tree_list_row_get_depth(row)*20);
        gboolean is_expanded = gtk_tree_list_row_get_expanded(row);
        if (0) printf("[on_experimental_tree_bind_factory] row content is [%s] and expander is [%d]\n", text, is_expanded);
    } else if (0) printf("[on_experimental_tree_bind_factory] row == NULL\n");
}

void on_experimental_tree_setup_factory (GtkSignalListItemFactory *factory,
                            GObject* object, gpointer user_data){
    GtkWidget* expander = gtk_expander_new (NULL);
    gtk_list_item_set_child (GTK_LIST_ITEM(object), expander);
    if (0) printf("[on_experimental_tree_setup_factory] here is an expander\n");
}

static GListModel* get_experimental_tree_model_child (struct TreeNode_t *parent){
    GtkStringList *list = NULL;
    if (parent) {
        if (0) printf("[get_experimental_tree_model_child] here is %s content : ", parent->text);
        struct TreeNode_t *child = parent->child;
        if (child) {list = gtk_string_list_new(NULL);}
        while(child) {
             gtk_string_list_append(list, child->text);
             if (0) printf("%s ", child->text);
             child = child->next;
        }
    }
    if (0) printf("\n");
    return G_LIST_MODEL(list);
}

GListModel* create_experimental_tree_model (GObject *item, gpointer root){
    struct TreeNode_t *cur = (struct TreeNode_t *)root;
    struct TreeNode_t *parent = root;
    const gchar *string =  gtk_string_object_get_string (GTK_STRING_OBJECT(item));
    while (cur) {
        if (strcmp(string, cur->text) == 0) break;
        cur = cur->next;
        if (cur == NULL) {cur = parent->child; parent = cur;}
    }
    if (0) printf("[create_experimental_tree_model] looked for %s in %s item\n", cur->text, string);
    return get_experimental_tree_model_child (cur);
}

void create_experimental_tree (GtkBox *experimental_box){
    struct TreeNode_t *tree_root = create_tree_node("hello");
    struct TreeNode_t *it_s_me   = create_tree_node("it's me");   add_child_node(tree_root, it_s_me);
    struct TreeNode_t *remember  = create_tree_node("do you remember ?");  add_child_node(it_s_me, remember);

    GtkStringList *model = gtk_string_list_new(NULL);
    gtk_string_list_append (model, tree_root->text);
    GtkSignalListItemFactory *factory = GTK_SIGNAL_LIST_ITEM_FACTORY (gtk_signal_list_item_factory_new());
    g_signal_connect (factory, "setup", G_CALLBACK(on_experimental_tree_setup_factory), NULL);
    g_signal_connect (factory, "bind", G_CALLBACK(on_experimental_tree_bind_factory), NULL);

    GtkTreeListModel *tree_model = gtk_tree_list_model_new(
        G_LIST_MODEL (model),
        FALSE, // Passthrough - False in actual usage with dynamic children retrieval
        FALSE, // autoexpand
        (GtkTreeListModelCreateModelFunc) &create_experimental_tree_model,
        tree_root,
        NULL // (GDestroyNotify) free_tree_node
    );

    GtkSingleSelection *selection_model = gtk_single_selection_new (G_LIST_MODEL (tree_model));
    gtk_single_selection_set_autoselect (selection_model, FALSE);
    gtk_single_selection_set_can_unselect (selection_model, TRUE);
    GtkWidget *list_view = gtk_list_view_new (GTK_SELECTION_MODEL (selection_model), GTK_LIST_ITEM_FACTORY (factory));
    GtkScrolledWindow *experimental_scrolled_window = GTK_SCROLLED_WINDOW (gtk_scrolled_window_new());
    gtk_scrolled_window_set_child(experimental_scrolled_window, list_view);
    gtk_scrolled_window_set_policy (experimental_scrolled_window, GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
    gtk_widget_set_vexpand(GTK_WIDGET(experimental_scrolled_window), TRUE);
    assert(experimental_box);
    gtk_box_append(GTK_BOX(experimental_box), GTK_WIDGET(experimental_scrolled_window));
    gtk_widget_set_visible(GTK_WIDGET(experimental_scrolled_window), TRUE);
    gtk_widget_set_visible(GTK_WIDGET(list_view), TRUE);
}