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

/**
 * SECTION:nmt-newt-entry
 * @short_description: Text entries
 *
 * #NmtNewtEntry implements entry widgets, with optional filtering and
 * validation.
 *
 * See also #NmtNewtEntryNumeric, for numeric-only entries.
 */

#include "nm-default.h"

#include "nmt-newt-entry.h"
#include "nmt-newt-form.h"
#include "nmt-newt-hacks.h"
#include "nmt-newt-utils.h"

G_DEFINE_TYPE(NmtNewtEntry, nmt_newt_entry, NMT_TYPE_NEWT_COMPONENT)

#define NMT_NEWT_ENTRY_GET_PRIVATE(o) \
    (G_TYPE_INSTANCE_GET_PRIVATE((o), NMT_TYPE_NEWT_ENTRY, NmtNewtEntryPrivate))

typedef struct {
    int               width;
    NmtNewtEntryFlags flags;
    char *            text;
    int               last_cursor_pos;
    guint             idle_update;

    NmtNewtEntryFilter filter;
    gpointer           filter_data;

    NmtNewtEntryValidator validator;
    gpointer              validator_data;
} NmtNewtEntryPrivate;

enum {
    PROP_0,
    PROP_TEXT,
    PROP_WIDTH,
    PROP_FLAGS,
    PROP_PASSWORD,

    LAST_PROP
};

/**
 * NmtNewtEntryFlags:
 * @NMT_NEWT_ENTRY_NOSCROLL: the entry content should not scroll left
 *   and right
 * @NMT_NEWT_ENTRY_PASSWORD: the entry should show '*'s instead of its
 *   actual contents
 * @NMT_NEWT_ENTRY_NONEMPTY: the entry should be considered not
 *   #NmtNewtWidget:valid if it is empty.
 *
 * Flags describing an #NmtNewtEntry
 */

/**
 * nmt_newt_entry_new:
 * @width: the width in characters for the entry
 * @flags: flags describing the entry
 *
 * Creates a new #NmtNewtEntry.
 *
 * Returns: a new #NmtNewtEntry
 */
NmtNewtWidget *
nmt_newt_entry_new(int width, NmtNewtEntryFlags flags)
{
    return g_object_new(NMT_TYPE_NEWT_ENTRY, "width", width, "flags", flags, NULL);
}

/**
 * NmtNewtEntryFilter:
 * @entry: the #NmtNewtEntry
 * @text: the current contents of @entry
 * @ch: the character just typed
 * @position: the position of the cursor in @entry
 * @user_data: the data passed to nmt_newt_entry_set_filter()
 *
 * Callback function used to filter the contents of an entry.
 *
 * Returns: %TRUE if @ch should be accepted, %FALSE if not
 */

/**
 * nmt_newt_entry_set_filter:
 * @entry: an #NmtNewtEntry
 * @filter: the function to use to filter the entry
 * @user_data: data for @filter
 *
 * Sets a #NmtNewtEntryFilter on @entry, to allow filtering out
 * certain characters from the entry.
 *
 * Note that @filter will only be called for printable characters (eg,
 * not for cursor-control characters or the like), and that it will
 * only be called for user input, not, eg, for
 * nmt_newt_entry_set_text().
 */
void
nmt_newt_entry_set_filter(NmtNewtEntry *entry, NmtNewtEntryFilter filter, gpointer user_data)
{
    NmtNewtEntryPrivate *priv = NMT_NEWT_ENTRY_GET_PRIVATE(entry);

    priv->filter      = filter;
    priv->filter_data = user_data;
}

static void
nmt_newt_entry_check_valid(NmtNewtEntry *entry)
{
    NmtNewtEntryPrivate *priv = NMT_NEWT_ENTRY_GET_PRIVATE(entry);
    gboolean             valid;

    if ((priv->flags & NMT_NEWT_ENTRY_NONEMPTY) && *priv->text == '\0')
        valid = FALSE;
    else if (priv->validator)
        valid = !!priv->validator(entry, priv->text, priv->validator_data);
    else
        valid = TRUE;

    nmt_newt_widget_set_valid(NMT_NEWT_WIDGET(entry), valid);
}

/**
 * NmtNewtEntryValidator:
 * @entry: the #NmtNewtEntry
 * @text: the current contents of @entry
 * @user_data: the data passed to nmt_newt_entry_set_validator()
 *
 * Callback function used to validate the contents of an entry.
 *
 * Returns: whether the entry is #NmtNewtWidget:valid
 */

/**
 * nmt_newt_entry_set_validator:
 * @entry: an #NmtNewtEntry
 * @validator: the function to use to validate the entry
 * @user_data: data for @validator
 *
 * Sets a #NmtNewtEntryValidator on @entry, to allow validation of
 * the entry contents. If @validator returns %FALSE, then the entry
 * will not be considered #NmtNewtWidget:valid.
 */
void
nmt_newt_entry_set_validator(NmtNewtEntry *        entry,
                             NmtNewtEntryValidator validator,
                             gpointer              user_data)
{
    NmtNewtEntryPrivate *priv = NMT_NEWT_ENTRY_GET_PRIVATE(entry);

    priv->validator      = validator;
    priv->validator_data = user_data;

    nmt_newt_entry_check_valid(entry);
}

static void
nmt_newt_entry_set_text_internal(NmtNewtEntry *entry, const char *text, newtComponent co)
{
    NmtNewtEntryPrivate *priv = NMT_NEWT_ENTRY_GET_PRIVATE(entry);

    if (!text)
        text = "";

    if (!strcmp(priv->text, text))
        return;

    g_free(priv->text);
    priv->text = g_strdup(text);

    if (co) {
        char *text_lc;

        text_lc = priv->text ? nmt_newt_locale_from_utf8(priv->text) : NULL;
        newtEntrySet(co, text_lc, TRUE);
        g_free(text_lc);
        priv->last_cursor_pos = -1;
    }

    g_object_freeze_notify(G_OBJECT(entry));
    nmt_newt_entry_check_valid(entry);
    g_object_notify(G_OBJECT(entry), "text");
    g_object_thaw_notify(G_OBJECT(entry));
}

/**
 * nmt_newt_entry_set_text:
 * @entry: an #NmtNewtEntry
 * @text: the new text
 *
 * Updates @entry's text. Note that this skips the entry's
 * #NmtNewtEntryFilter, but will cause its #NmtNewtEntryValidator to
 * be re-run.
 */
void
nmt_newt_entry_set_text(NmtNewtEntry *entry, const char *text)
{
    newtComponent co;

    co = nmt_newt_component_get_component(NMT_NEWT_COMPONENT(entry));
    nmt_newt_entry_set_text_internal(entry, text, co);
}

/**
 * nmt_newt_entry_get_text:
 * @entry: an #NmtNewtEntry
 *
 * Gets @entry's text
 *
 * Returns: @entry's text
 */
const char *
nmt_newt_entry_get_text(NmtNewtEntry *entry)
{
    NmtNewtEntryPrivate *priv = NMT_NEWT_ENTRY_GET_PRIVATE(entry);

    return priv->text;
}

/**
 * nmt_newt_entry_set_width:
 * @entry: an #NmtNewtEntpry
 * @widget: the new width
 *
 * Updates @entry's width
 */
void
nmt_newt_entry_set_width(NmtNewtEntry *entry, int width)
{
    NmtNewtEntryPrivate *priv = NMT_NEWT_ENTRY_GET_PRIVATE(entry);

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

    priv->width = width;
    nmt_newt_widget_needs_rebuild(NMT_NEWT_WIDGET(entry));

    g_object_notify(G_OBJECT(entry), "width");
}

/**
 * nmt_newt_entry_get_width:
 * @entry: an #NmtNewtEntry
 *
 * Gets @entry's width
 *
 * Returns: @entry's width
 */
int
nmt_newt_entry_get_width(NmtNewtEntry *entry)
{
    NmtNewtEntryPrivate *priv = NMT_NEWT_ENTRY_GET_PRIVATE(entry);

    return priv->width;
}

static void
nmt_newt_entry_init(NmtNewtEntry *entry)
{
    NmtNewtEntryPrivate *priv = NMT_NEWT_ENTRY_GET_PRIVATE(entry);

    priv->text            = g_strdup("");
    priv->last_cursor_pos = -1;
}

static void
nmt_newt_entry_constructed(GObject *object)
{
    nmt_newt_entry_check_valid(NMT_NEWT_ENTRY(object));

    G_OBJECT_CLASS(nmt_newt_entry_parent_class)->constructed(object);
}

static void
nmt_newt_entry_finalize(GObject *object)
{
    NmtNewtEntryPrivate *priv = NMT_NEWT_ENTRY_GET_PRIVATE(object);

    g_free(priv->text);
    if (priv->idle_update)
        g_source_remove(priv->idle_update);

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

static gboolean
idle_update_entry(gpointer entry)
{
    NmtNewtEntryPrivate *priv = NMT_NEWT_ENTRY_GET_PRIVATE(entry);
    newtComponent        co   = nmt_newt_component_get_component(entry);
    char *               text;

    priv->idle_update = 0;
    if (!co)
        return FALSE;

    priv->last_cursor_pos = newtEntryGetCursorPosition(co);

    text = nmt_newt_locale_to_utf8(newtEntryGetValue(co));
    nmt_newt_entry_set_text_internal(entry, text, NULL);
    g_free(text);

    return FALSE;
}

static int
entry_filter(newtComponent entry, void *self, int ch, int cursor)
{
    NmtNewtEntryPrivate *priv = NMT_NEWT_ENTRY_GET_PRIVATE(self);

    if (g_ascii_isprint(ch)) {
        if (priv->filter) {
            char *text = nmt_newt_locale_to_utf8(newtEntryGetValue(entry));

            if (!priv->filter(self, text, ch, cursor, priv->filter_data)) {
                g_free(text);
                return 0;
            }
            g_free(text);
        }
    }

    if (!priv->idle_update)
        priv->idle_update = g_idle_add(idle_update_entry, self);
    return ch;
}

static guint
convert_flags(NmtNewtEntryFlags flags)
{
    guint newt_flags = NEWT_FLAG_RETURNEXIT;

    if (!(flags & NMT_NEWT_ENTRY_NOSCROLL))
        newt_flags |= NEWT_FLAG_SCROLL;
    if (flags & NMT_NEWT_ENTRY_PASSWORD)
        newt_flags |= NEWT_FLAG_PASSWORD;

    return newt_flags;
}

static newtComponent
nmt_newt_entry_build_component(NmtNewtComponent *component, gboolean sensitive)
{
    NmtNewtEntryPrivate *priv = NMT_NEWT_ENTRY_GET_PRIVATE(component);
    newtComponent        co;
    char *               text_lc;
    int                  flags;

    flags = convert_flags(priv->flags);
    if (!sensitive)
        flags |= NEWT_FLAG_DISABLED;

    text_lc = priv->text ? nmt_newt_locale_from_utf8(priv->text) : NULL;
    co      = newtEntry(-1, -1, text_lc, priv->width, NULL, flags);
    g_free(text_lc);

    if (priv->last_cursor_pos != -1)
        newtEntrySetCursorPosition(co, priv->last_cursor_pos);

    newtEntrySetFilter(co, entry_filter, component);
    return co;
}

static void
nmt_newt_entry_activated(NmtNewtWidget *widget)
{
    NmtNewtEntryPrivate *priv = NMT_NEWT_ENTRY_GET_PRIVATE(widget);

    if (priv->idle_update) {
        g_source_remove(priv->idle_update);
        idle_update_entry(widget);
    }

    NMT_NEWT_WIDGET_CLASS(nmt_newt_entry_parent_class)->activated(widget);
}

static void
nmt_newt_entry_set_property(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
    NmtNewtEntry *       entry = NMT_NEWT_ENTRY(object);
    NmtNewtEntryPrivate *priv  = NMT_NEWT_ENTRY_GET_PRIVATE(entry);

    switch (prop_id) {
    case PROP_TEXT:
        nmt_newt_entry_set_text(entry, g_value_get_string(value));
        break;
    case PROP_WIDTH:
        nmt_newt_entry_set_width(entry, g_value_get_int(value));
        break;
    case PROP_FLAGS:
        priv->flags = g_value_get_uint(value);
        nmt_newt_widget_needs_rebuild(NMT_NEWT_WIDGET(entry));
        break;
    case PROP_PASSWORD:
        if (g_value_get_boolean(value))
            priv->flags |= NMT_NEWT_ENTRY_PASSWORD;
        else
            priv->flags &= ~NMT_NEWT_ENTRY_PASSWORD;
        nmt_newt_widget_needs_rebuild(NMT_NEWT_WIDGET(entry));
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
        break;
    }
}

static void
nmt_newt_entry_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
    NmtNewtEntry *       entry = NMT_NEWT_ENTRY(object);
    NmtNewtEntryPrivate *priv  = NMT_NEWT_ENTRY_GET_PRIVATE(entry);

    switch (prop_id) {
    case PROP_TEXT:
        g_value_set_string(value, nmt_newt_entry_get_text(entry));
        break;
    case PROP_WIDTH:
        g_value_set_int(value, priv->width);
        break;
    case PROP_FLAGS:
        g_value_set_uint(value, priv->flags);
        break;
    case PROP_PASSWORD:
        g_value_set_boolean(value, (priv->flags & NMT_NEWT_ENTRY_PASSWORD) != 0);
        break;
    default:
        G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
        break;
    }
}

static void
nmt_newt_entry_class_init(NmtNewtEntryClass *entry_class)
{
    GObjectClass *         object_class    = G_OBJECT_CLASS(entry_class);
    NmtNewtWidgetClass *   widget_class    = NMT_NEWT_WIDGET_CLASS(entry_class);
    NmtNewtComponentClass *component_class = NMT_NEWT_COMPONENT_CLASS(entry_class);

    g_type_class_add_private(entry_class, sizeof(NmtNewtEntryPrivate));

    /* virtual methods */
    object_class->constructed  = nmt_newt_entry_constructed;
    object_class->set_property = nmt_newt_entry_set_property;
    object_class->get_property = nmt_newt_entry_get_property;
    object_class->finalize     = nmt_newt_entry_finalize;

    widget_class->activated = nmt_newt_entry_activated;

    component_class->build_component = nmt_newt_entry_build_component;

    /**
     * NmtNewtEntry:text
     *
     * The entry's text
     */
    g_object_class_install_property(
        object_class,
        PROP_TEXT,
        g_param_spec_string("text", "", "", NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
    /**
     * NmtNewtEntry:width
     *
     * The entry's width in characters
     */
    g_object_class_install_property(
        object_class,
        PROP_WIDTH,
        g_param_spec_int("width", "", "", -1, 80, -1, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
    /**
     * NmtNewtEntry:flags
     *
     * The entry's #NmtNewtEntryFlags
     */
    g_object_class_install_property(
        object_class,
        PROP_FLAGS,
        g_param_spec_uint("flags",
                          "",
                          "",
                          0,
                          0xFFFF,
                          0,
                          G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY | G_PARAM_STATIC_STRINGS));
    /**
     * NmtNewtEntry:password
     *
     * %TRUE if #NmtNewtEntry:flags contains %NMT_NEWT_ENTRY_PASSWORD,
     * %FALSE if not.
     */
    g_object_class_install_property(
        object_class,
        PROP_PASSWORD,
        g_param_spec_boolean("password",
                             "",
                             "",
                             FALSE,
                             G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}