/*
 * Copyright (C) 2021 Linux Studio Plugins Project <https://lsp-plug.in/>
 *           (C) 2021 Vladimir Sadovnikov <sadko4u@gmail.com>
 *
 * This file is part of lsp-plugin-fw
 * Created on: 10 апр. 2021 г.
 *
 * lsp-plugin-fw is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 *
 * lsp-plugin-fw is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with lsp-plugin-fw. If not, see <https://www.gnu.org/licenses/>.
 */

#include <private/ui/xml/SetNode.h>
#include <private/ui/xml/NodeFactory.h>

namespace lsp
{
    namespace ui
    {
        namespace xml
        {
            //-----------------------------------------------------------------
            NODE_FACTORY_IMPL_START(SetNode)
                size_t flags;
                if (name->equals_ascii("ui:set"))
                    flags = expr::Expression::FLAG_STRING;
                else if (name->equals_ascii("ui:eval"))
                    flags = expr::Expression::FLAG_NONE;
                else
                    return STATUS_NOT_FOUND;

                *child = new SetNode(context, parent, flags);
                return (*child != NULL) ? STATUS_OK : STATUS_NO_MEM;
            NODE_FACTORY_IMPL_END(SetNode)

            //-----------------------------------------------------------------
            SetNode::SetNode(UIContext *ctx, Node *parent, size_t flags): Node(ctx, parent)
            {
                nFlags = flags;
            }

            status_t SetNode::enter(const LSPString * const *atts)
            {
                enum node_flags_t
                {
                    F_ID_SET    = 1 << 0,
                    F_VALUE_SET = 1 << 1
                };

                status_t res;
                size_t flags = 0;
                LSPString v_name;
                expr::value_t v_value;
                expr::init_value(&v_value);

                for ( ; *atts != NULL; atts += 2)
                {
                    const LSPString *name   = atts[0];
                    const LSPString *value  = atts[1];

                    if ((name == NULL) || (value == NULL))
                        continue;

                    if (name->equals_ascii("id"))
                    {
                        if (flags & F_ID_SET)
                        {
                            lsp_error("Duplicate attributes '%s': %s", name->get_native(), value->get_native());
                            expr::destroy_value(&v_value);
                            return STATUS_BAD_FORMAT;
                        }
                        flags      |= F_ID_SET;
                        if ((res = pContext->eval_string(&v_name, value)) != STATUS_OK)
                        {
                            lsp_error("Could not evaluate expression attribute '%s': %s", name->get_native(), value->get_native());
                            expr::destroy_value(&v_value);
                            return res;
                        }
                    }
                    else if (name->equals_ascii("value"))
                    {
                        if (flags & F_VALUE_SET)
                        {
                            lsp_error("Duplicate attributes '%s': %s", name->get_native(), value->get_native());
                            expr::destroy_value(&v_value);
                            return STATUS_BAD_FORMAT;
                        }
                        flags      |= F_VALUE_SET;
                        if ((res = pContext->evaluate(&v_value, value, nFlags)) != STATUS_OK)
                        {
                            lsp_error("Could not evaluate expression attribute '%s': %s", name->get_native(), value->get_native());
                            expr::destroy_value(&v_value);
                            return res;
                        }
                    }
                    else
                    {
                        lsp_error("Unknown attribute: '%s'", name->get_utf8());
                        expr::destroy_value(&v_value);
                        return STATUS_CORRUPTED;
                    }
                }

                if (flags != (F_ID_SET | F_VALUE_SET))
                {
                    lsp_error("Not all attributes are set");
                    expr::destroy_value(&v_value);
                    return STATUS_CORRUPTED;
                }

                // Set variable and destroy value
                res = pContext->vars()->set(&v_name, &v_value);
                expr::destroy_value(&v_value);
                return res;
            }

        }
    }
}
