// SPDX-License-Identifier: LGPL-2.1-or-later

#include <Python.h>
#include <gtk/gtk.h>
#include <stdlib.h>

static void helloWorld(GtkWidget* wid, GtkWidget* win)
{
    PyObject* mmod = PyImport_AddModule("__main__");
    PyObject* dict = PyModule_GetDict(mmod);
    PyRun_String(
        "import sys\n"
        "sys.path.append(\"/home/werner/FreeCAD/lib\")",
        Py_file_input,
        dict,
        dict
    );
    PyObject* result = PyRun_String(
        "import FreeCADGui\n"
        "FreeCADGui.showMainWindow()",
        Py_file_input,
        dict,
        dict
    );
    if (result) {
        Py_DECREF(result);
    }
    else {
        PyObject *ptype, *pvalue, *ptrace;
        PyErr_Fetch(&ptype, &pvalue, &ptrace);
        PyObject* pystring = PyObject_Str(pvalue);
        const char* error = PyUnicode_AsUTF8(pystring);

        GtkWidget* dialog = NULL;
        dialog = gtk_message_dialog_new(
            GTK_WINDOW(win),
            GTK_DIALOG_MODAL,
            GTK_MESSAGE_INFO,
            GTK_BUTTONS_CLOSE,
            "%s",
            error
        );
        gtk_window_set_position(GTK_WINDOW(dialog), GTK_WIN_POS_CENTER);
        gtk_dialog_run(GTK_DIALOG(dialog));
        gtk_widget_destroy(dialog);

        Py_DECREF(pystring);
    }
    Py_DECREF(dict);
}

int main(int argc, char* argv[])
{
    GtkWidget* button = NULL;
    GtkWidget* win = NULL;
    GtkWidget* vbox = NULL;

    /* Init Python */
    wchar_t* program = Py_DecodeLocale(argv[0], NULL);
    if (program == NULL) {
        fprintf(stderr, "Fatal error: cannot decode argv[0]\n");
        exit(1);
    }

    Py_SetProgramName(program);
    Py_Initialize();
    PyEval_InitThreads();

    wchar_t* args[argc];
    for (int i = 0; i < argc; i++) {
        args[i] = Py_DecodeLocale(argv[i], NULL);
    }
    PySys_SetArgv(argc, args);

    /* Initialize GTK+ */
    g_log_set_handler("Gtk", G_LOG_LEVEL_WARNING, (GLogFunc)gtk_false, NULL);
    gtk_init(&argc, &argv);
    g_log_set_handler("Gtk", G_LOG_LEVEL_WARNING, g_log_default_handler, NULL);

    /* Create the main window */
    win = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    gtk_container_set_border_width(GTK_CONTAINER(win), 8);
    gtk_window_set_title(GTK_WINDOW(win), "Hello World");
    gtk_window_set_position(GTK_WINDOW(win), GTK_WIN_POS_CENTER);
    gtk_widget_realize(win);
    g_signal_connect(win, "destroy", gtk_main_quit, NULL);

    /* Create a vertical box with buttons */
    vbox = gtk_box_new(TRUE, 6);
    gtk_container_add(GTK_CONTAINER(win), vbox);

    button = gtk_button_new_from_icon_name("document-open", GTK_ICON_SIZE_BUTTON);
    gtk_button_set_label((GtkButton*)button, "Load module");
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(helloWorld), (gpointer)win);
    gtk_box_pack_start(GTK_BOX(vbox), button, TRUE, TRUE, 0);

    button = gtk_button_new_from_icon_name("window-close", GTK_ICON_SIZE_BUTTON);
    gtk_button_set_label((GtkButton*)button, "Close");
    g_signal_connect(button, "clicked", gtk_main_quit, NULL);
    gtk_box_pack_start(GTK_BOX(vbox), button, TRUE, TRUE, 0);

    /* Enter the main loop */
    gtk_widget_show_all(win);
    gtk_main();
    return 0;
}