/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (C) 2013 Red Hat, Inc.
 */

/**
 * SECTION:nmt-newt-stack
 * @short_description: A stack of alternative widgets
 *
 * #NmtNewtStack implements a stack of widgets, only one of which is
 * visible at any time.
 *
 * The height and width of the widget is determined only by its
 * visible child. Likewise, the widget's #NmtNewtWidget:valid is
 * determined only by the validity of its visible child, not its other
 * children.
 */

#include "libnm/nm-default-client.h"

#include "nmt-newt-stack.h"

G_DEFINE_TYPE(NmtNewtStack, nmt_newt_stack, NMT_TYPE_NEWT_CONTAINER)

#define NMT_NEWT_STACK_GET_PRIVATE(o) \
    (G_TYPE_INSTANCE_GET_PRIVATE((o), NMT_TYPE_NEWT_STACK, NmtNewtStackPrivate))

typedef struct {
    GPtrArray *children;
    GPtrArray *ids;

    guint active;
} NmtNewtStackPrivate;

enum {
    PROP_0,
    PROP_ACTIVE,
    PROP_ACTIVE_ID,

    LAST_PROP
};

/**
 * nmt_newt_stack_new:
 *
 * Creates a new #NmtNewtStack
 *
 * Returns: a new #NmtNewtStack
 */
NmtNewtWidget *
nmt_newt_stack_new(void)
{
    return g_object_new(NMT_TYPE_NEWT_STACK, NULL);
}

static void
nmt_newt_stack_init(NmtNewtStack *stack)
{
    NmtNewtStackPrivate *priv = NMT_NEWT_STACK_GET_PRIVATE(stack);

    priv->children = g_ptr_array_new();
    priv->ids      = g_ptr_array_new_with_free_func(g_free);
}

static void
nmt_newt_stack_finalize(GObject *object)
{
    NmtNewtStackPrivate *priv = NMT_NEWT_STACK_GET_PRIVATE(object);

    g_ptr_array_unref(priv->children);
    g_ptr_array_unref(priv->ids);

    G_OBJECT_CLASS(nmt_newt_stack_parent_class)->finalize(object);
}

static newtComponent *
nmt_newt_stack_get_components(NmtNewtWidget *widget)
{
    NmtNewtStackPrivate *priv = NMT_NEWT_STACK_GET_PRIVATE(widget);

    if (priv->active > priv->children->len)
        return NULL;

    return nmt_newt_widget_get_components(priv->children->pdata[priv->active]);
}

static void
nmt_newt_stack_size_request(NmtNewtWidget *widget, int *width, int *height)
{
    NmtNewtStack *       stack = NMT_NEWT_STACK(widget);
    NmtNewtStackPrivate *priv  = NMT_NEWT_STACK_GET_PRIVATE(stack);
    int                  i, child_width, child_height;

    if (priv->active > priv->children->len) {
        *width = *height = 0;
        return;
    }

    /* We size-request all pages so that embedded NmtPageGrids will
     * participate in their size-grouping (so that switching pages
     * won't result in the column widths changing).
     */
    for (i = 0; i < priv->children->len; i++) {
        nmt_newt_widget_size_request(priv->children->pdata[i], &child_width, &child_height);
        if (i == priv->active) {
            *width  = child_width;
            *height = child_height;
        }
    }
}

static void
nmt_newt_stack_size_allocate(NmtNewtWidget *widget, int x, int y, int width, int height)
{
    NmtNewtStackPrivate *priv = NMT_NEWT_STACK_GET_PRIVATE(widget);

    if (priv->active > priv->children->len)
        return;

    nmt_newt_widget_size_allocate(priv->children->pdata[priv->active], x, y, width, height);
}

/**
 * nmt_newt_stack_add:
 * @stack: an #NmtNewtStack
 * @id: the ID for the new page
 * @widget: the widget to add
 *
 * Adds @widget to @stack with the given @id.
 */
void
nmt_newt_stack_add(NmtNewtStack *stack, const char *id, NmtNewtWidget *widget)
{
    NmtNewtStackPrivate *priv = NMT_NEWT_STACK_GET_PRIVATE(stack);

    g_ptr_array_add(priv->children, widget);
    g_ptr_array_add(priv->ids, g_strdup(id));

    NMT_NEWT_CONTAINER_CLASS(nmt_newt_stack_parent_class)->add(NMT_NEWT_CONTAINER(stack), widget);
}

static void
nmt_newt_stack_remove(NmtNewtContainer *container, NmtNewtWidget *widget)
{
    NmtNewtStack *       stack = NMT_NEWT_STACK(container);
    NmtNewtStackPrivate *priv  = NMT_NEWT_STACK_GET_PRIVATE(stack);
    int                  i;

    NMT_NEWT_CONTAINER_CLASS(nmt_newt_stack_parent_class)->remove(container, widget);

    for (i = 0; i < priv->children->len; i++) {
        if (priv->children->pdata[i] == widget) {
            g_ptr_array_remove_index(priv->children, i);
            g_ptr_array_remove_index(priv->ids, i);
            return;
        }
    }
}

static void
nmt_newt_stack_child_validity_changed(NmtNewtContainer *container, NmtNewtWidget *widget)
{
    NmtNewtStackPrivate *priv = NMT_NEWT_STACK_GET_PRIVATE(container);

    if (priv->active > priv->children->len)
        return;

    if (priv->children->pdata[priv->active] == (gpointer) widget) {
        NMT_NEWT_CONTAINER_CLASS(nmt_newt_stack_parent_class)
            ->child_validity_changed(container, widget);
    }
}

/**
 * nmt_newt_stack_set_active:
 * @stack: an #NmtNewtStack
 * @active: the index of the new active page
 *
 * Sets the active page on @stack to @active.
 */
void
nmt_newt_stack_set_active(NmtNewtStack *stack, guint active)
{
    NmtNewtStackPrivate *priv = NMT_NEWT_STACK_GET_PRIVATE(stack);

    if (priv->active == active)
        return;

    priv->active = active;
    g_object_notify(G_OBJECT(stack), "active");
    g_object_notify(G_OBJECT(stack), "active-id");
    nmt_newt_widget_needs_rebuild(NMT_NEWT_WIDGET(stack));
}

/**
 * nmt_newt_stack_get_active:
 * @stack: an #NmtNewtStack
 *
 * Gets the index of the active page on @stack
 *
 * Returns: the index of the active page on @stack
 */
guint
nmt_newt_stack_get_active(NmtNewtStack *stack)
{
    NmtNewtStackPrivate *priv = NMT_NEWT_STACK_GET_PRIVATE(stack);

    return priv->active;
}

/**
 * nmt_newt_stack_set_active_id:
 * @stack: an #NmtNewtStack
 * @active_id: the ID of the new active page
 *
 * Sets the active page on @stack to @active_id.
 */
void
nmt_newt_stack_set_active_id(NmtNewtStack *stack, const char *id)
{
    NmtNewtStackPrivate *priv = NMT_NEWT_STACK_GET_PRIVATE(stack);
    int                  i;

    if (!g_strcmp0(priv->ids->pdata[priv->active], id))
        return;

    for (i = 0; i < priv->ids->len; i++) {
        if (!g_strcmp0(priv->ids->pdata[i], id)) {
            priv->active = i;
            g_object_notify(G_OBJECT(stack), "active");
            g_object_notify(G_OBJECT(stack), "active-id");
            nmt_newt_widget_needs_rebuild(NMT_NEWT_WIDGET(stack));
            return;
        }
    }
}

/**
 * nmt_newt_stack_get_active_id:
 * @stack: an #NmtNewtStack
 *
 * Gets the ID of the active page on @stack
 *
 * Returns: the ID of the active page on @stack
 */
const char *
nmt_newt_stack_get_active_id(NmtNewtStack *stack)
{
    NmtNewtStackPrivate *priv = NMT_NEWT_STACK_GET_PRIVATE(stack);

    if (priv->active > priv->children->len)
        return NULL;

    return priv->ids->pdata[priv->active];
}

static void
nmt_newt_stack_set_property(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
    NmtNewtStack *stack = NMT_NEWT_STACK(object);

    switch (prop_id) {
    case PROP_ACTIVE:
        nmt_newt_stack_set_active(stack, g_value_get_uint(value));
        break;
    case PROP_ACTIVE_ID:
        nmt_newt_stack_set_active_id(stack, g_value_get_string(value));
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
        break;
    }
}

static void
nmt_newt_stack_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
    NmtNewtStack *stack = NMT_NEWT_STACK(object);

    switch (prop_id) {
    case PROP_ACTIVE:
        g_value_set_uint(value, nmt_newt_stack_get_active(stack));
        break;
    case PROP_ACTIVE_ID:
        g_value_set_string(value, nmt_newt_stack_get_active_id(stack));
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
        break;
    }
}

static void
nmt_newt_stack_class_init(NmtNewtStackClass *stack_class)
{
    GObjectClass *         object_class    = G_OBJECT_CLASS(stack_class);
    NmtNewtWidgetClass *   widget_class    = NMT_NEWT_WIDGET_CLASS(stack_class);
    NmtNewtContainerClass *container_class = NMT_NEWT_CONTAINER_CLASS(stack_class);

    g_type_class_add_private(stack_class, sizeof(NmtNewtStackPrivate));

    /* virtual methods */
    object_class->set_property = nmt_newt_stack_set_property;
    object_class->get_property = nmt_newt_stack_get_property;
    object_class->finalize     = nmt_newt_stack_finalize;

    widget_class->get_components = nmt_newt_stack_get_components;
    widget_class->size_request   = nmt_newt_stack_size_request;
    widget_class->size_allocate  = nmt_newt_stack_size_allocate;

    container_class->remove                 = nmt_newt_stack_remove;
    container_class->child_validity_changed = nmt_newt_stack_child_validity_changed;

    /**
     * NmtNewtStack:active:
     *
     * The index of the active page
     */
    g_object_class_install_property(object_class,
                                    PROP_ACTIVE,
                                    g_param_spec_uint("active",
                                                      "",
                                                      "",
                                                      0,
                                                      G_MAXUINT,
                                                      0,
                                                      G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
    /**
     * NmtNewtStack:active-id:
     *
     * The ID of the active page
     */
    g_object_class_install_property(
        object_class,
        PROP_ACTIVE_ID,
        g_param_spec_string("active-id", "", "", NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}