/*
 *   moocommand-script.c
 *
 *   Copyright (C) 2004-2006 by Yevgen Muntyan <muntyan@math.tamu.edu>
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   See COPYING file that comes with this distribution.
 */

#define MOOEDIT_COMPILATION
#include "mooedit/moocommand-script.h"
#include "mooedit/mooedit-script.h"
#include "mooedit/mooedittools-glade.h"
#include "mooedit/mooeditor.h"
#include "mooedit/mootext-private.h"
#include "mooscript/mooscript-parser.h"
#include "mooutils/mooi18n.h"
#include "mooutils/mooglade.h"
#include "mooutils/mooutils-misc.h"
#include "mooutils/mootype-macros.h"
#include <string.h>


struct _MooCommandScriptPrivate {
    MSNode *script;
};

G_DEFINE_TYPE (MooCommandScript, moo_command_script, MOO_TYPE_COMMAND)

typedef MooCommandFactory MooCommandFactoryScript;
typedef MooCommandFactoryClass MooCommandFactoryScriptClass;
MOO_DEFINE_TYPE_STATIC (MooCommandFactoryScript, _moo_command_factory_script, MOO_TYPE_COMMAND_FACTORY)


static MooCommand  *moo_command_script_new  (const char         *script,
                                             MooCommandOptions   options);


static void
set_variable (const char   *name,
              const GValue *value,
              gpointer      data)
{
    MSContext *ctx = data;
    MSValue *ms_value;

    ms_value = ms_value_from_gvalue (value);
    g_return_if_fail (ms_value != NULL);

    ms_context_assign_variable (ctx, name, ms_value);
    ms_value_unref (ms_value);
}


static void
moo_command_script_run (MooCommand        *cmd_base,
                        MooCommandContext *ctx)
{
    gpointer doc;
    MSValue *ret;
    MSContext *script_ctx;
    MooCommandScript *cmd = MOO_COMMAND_SCRIPT (cmd_base);
    GtkTextBuffer *buffer;

    g_return_if_fail (cmd->priv->script != NULL);

    script_ctx = moo_edit_script_context_new (moo_command_context_get_doc (ctx),
                                              moo_command_context_get_window (ctx));
    g_return_if_fail (script_ctx != NULL);

    moo_command_context_foreach (ctx, set_variable, script_ctx);

    doc = moo_command_context_get_doc (ctx);
    buffer = doc ? gtk_text_view_get_buffer (doc) : NULL;

    if (buffer)
        gtk_text_buffer_begin_user_action (buffer);

    ret = ms_top_node_eval (cmd->priv->script, script_ctx);

    if (buffer)
        gtk_text_buffer_end_user_action (buffer);

    if (!ret)
    {
        g_print ("%s\n", ms_context_get_error_msg (script_ctx));
        ms_context_clear_error (script_ctx);
    }

    ms_value_unref (ret);
    g_object_unref (script_ctx);
}


static void
moo_command_script_dispose (GObject *object)
{
    MooCommandScript *cmd = MOO_COMMAND_SCRIPT (object);

    if (cmd->priv)
    {
        ms_node_unref (cmd->priv->script);
        cmd->priv = NULL;
    }

    G_OBJECT_CLASS(moo_command_script_parent_class)->dispose (object);
}


static MooCommand *
script_factory_create_command (G_GNUC_UNUSED MooCommandFactory *factory,
                               MooCommandData *data,
                               const char     *options)
{
    MooCommand *cmd;
    const char *code;

    code = moo_command_data_get_code (data);

    g_return_val_if_fail (code && *code, NULL);

    cmd = moo_command_script_new (code, moo_command_options_parse (options));
    g_return_val_if_fail (cmd != NULL, NULL);

    return cmd;
}


static GtkWidget *
script_factory_create_widget (G_GNUC_UNUSED MooCommandFactory *factory)
{
    GtkWidget *page;
    MooGladeXML *xml;
    MooTextView *textview;

    xml = moo_glade_xml_new_empty (GETTEXT_PACKAGE);
    moo_glade_xml_map_id (xml, "textview", MOO_TYPE_TEXT_VIEW);
    moo_glade_xml_parse_memory (xml, MOO_EDIT_TOOLS_GLADE_XML, -1, "moo_script_page", NULL);
    page = moo_glade_xml_get_widget (xml, "moo_script_page");
    g_return_val_if_fail (page != NULL, NULL);

    textview = moo_glade_xml_get_widget (xml, "textview");
    moo_text_view_set_font_from_string (textview, "Monospace");
    moo_text_view_set_lang_by_id (textview, "mooscript");

    g_object_set_data_full (G_OBJECT (page), "moo-glade-xml", xml, g_object_unref);
    return page;
}


static void
script_factory_load_data (G_GNUC_UNUSED MooCommandFactory *factory,
                          GtkWidget      *page,
                          MooCommandData *data)
{
    MooGladeXML *xml;
    GtkTextView *textview;
    GtkTextBuffer *buffer;
    const char *code;

    xml = g_object_get_data (G_OBJECT (page), "moo-glade-xml");
    textview = moo_glade_xml_get_widget (xml, "textview");
    buffer = gtk_text_view_get_buffer (textview);

    code = moo_command_data_get_code (data);
    gtk_text_buffer_set_text (buffer, code ? code : "", -1);
}


static gboolean
script_factory_save_data (G_GNUC_UNUSED MooCommandFactory *factory,
                          GtkWidget      *page,
                          MooCommandData *data)
{
    MooGladeXML *xml;
    GtkTextView *textview;
    const char *code;
    char *new_code;
    gboolean changed = FALSE;

    xml = g_object_get_data (G_OBJECT (page), "moo-glade-xml");
    textview = moo_glade_xml_get_widget (xml, "textview");
    g_assert (GTK_IS_TEXT_VIEW (textview));

    new_code = moo_text_view_get_text (textview);
    code = moo_command_data_get_code (data);

    if (!_moo_str_equal (code, new_code))
    {
        moo_command_data_set_code (data, new_code);
        changed = TRUE;
    }

    g_free (new_code);
    return changed;
}


static gboolean
script_factory_data_equal (G_GNUC_UNUSED MooCommandFactory *factory,
                           MooCommandData *data1,
                           MooCommandData *data2)
{
    const char *val1 = moo_command_data_get_code (data1);
    const char *val2 = moo_command_data_get_code (data2);
    return _moo_str_equal (val1, val2);
}


static void
_moo_command_factory_script_init (G_GNUC_UNUSED MooCommandFactory *factory)
{
}

static void
_moo_command_factory_script_class_init (MooCommandFactoryClass *klass)
{
    klass->create_command = script_factory_create_command;
    klass->create_widget = script_factory_create_widget;
    klass->load_data = script_factory_load_data;
    klass->save_data = script_factory_save_data;
    klass->data_equal = script_factory_data_equal;
}


static void
moo_command_script_class_init (MooCommandScriptClass *klass)
{
    MooCommandFactory *factory;

    G_OBJECT_CLASS(klass)->dispose = moo_command_script_dispose;
    MOO_COMMAND_CLASS(klass)->run = moo_command_script_run;

    g_type_class_add_private (klass, sizeof (MooCommandScriptPrivate));

    factory = g_object_new (_moo_command_factory_script_get_type (), NULL);
    moo_command_factory_register ("moo-script", _("MooScript"), factory, NULL);
    g_object_unref (factory);
}


static void
moo_command_script_init (MooCommandScript *cmd)
{
    cmd->priv = G_TYPE_INSTANCE_GET_PRIVATE (cmd,
                                             MOO_TYPE_COMMAND_SCRIPT,
                                             MooCommandScriptPrivate);
}


static MooCommand *
moo_command_script_new (const char       *script,
                        MooCommandOptions options)
{
    MooCommandScript *cmd;
    MSNode *node;

    g_return_val_if_fail (script != NULL, NULL);

    node = ms_script_parse (script);
    g_return_val_if_fail (node != NULL, NULL);

    cmd = g_object_new (MOO_TYPE_COMMAND_SCRIPT, "options", options, NULL);
    cmd->priv->script = node;

    return MOO_COMMAND (cmd);
}