// This file was generated with the assistance of an AI coding tool.
/********************************************************************************
 *                                                                              *
 * This file is part of Bonsai.                                                 *
 *                                                                              *
 * Bonsai 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 3.0 of the License, or          *
 * (at your option) any later version.                                          *
 *                                                                              *
 * Bonsai 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 General Public License for more details.                                 *
 *                                                                              *
 * You should have received a copy of the GNU General Public License            *
 * along with this program. If not, see <http://www.gnu.org/licenses/>.         *
 *                                                                              *
 ********************************************************************************/

#include "ElementRegistry.h"

#include "../ifcviewer/GeometryStreamer.h"
#include "../ifcviewer/SceneLoader.h"
#include "../ifcviewer/SidecarCache.h"

namespace bonsaiviewer {

ElementRegistry::ElementRegistry(QObject* parent)
    : QObject(parent)
{
}

void ElementRegistry::bindLoader(SceneLoader* loader) {
    loader_ = loader;
    connect(loader, &SceneLoader::sidecarElementsReady,
            this, &ElementRegistry::onSidecarElementsReady);
    connect(loader, &SceneLoader::streamedElementsReady,
            this, &ElementRegistry::onStreamedElementsReady);
}

void ElementRegistry::clear() {
    elements_.clear();
}

void ElementRegistry::removeModel(uint32_t session_model_id) {
    for (auto it = elements_.begin(); it != elements_.end();) {
        if (it->second.session_model_id == session_model_id) {
            it = elements_.erase(it);
        } else {
            ++it;
        }
    }
}

std::vector<BasicElementInfo> ElementRegistry::basicElementInfoForModel(uint32_t session_model_id) const {
    std::vector<BasicElementInfo> result;
    result.reserve(elements_.size());
    for (const auto& [object_id, info] : elements_) {
        (void)object_id;
        if (info.session_model_id != session_model_id) continue;
        result.push_back(info);
    }
    return result;
}

std::optional<BasicElementInfo> ElementRegistry::findBasicElementInfo(uint32_t object_id) const {
    auto it = elements_.find(object_id);
    if (it == elements_.end()) return std::nullopt;
    return it->second;
}

std::optional<express::Base> ElementRegistry::findEntity(uint32_t object_id) const {
    if (!loader_) return std::nullopt;

    auto info = findBasicElementInfo(object_id);
    if (!info) return std::nullopt;

    auto* file = loader_->ifcFile(info->session_model_id);
    if (!file) return std::nullopt;

    try {
        auto instance = file->instance_by_id(info->ifc_id);
        if (!instance) return std::nullopt;
        return instance;
    } catch (...) {
        return std::nullopt;
    }
}

void ElementRegistry::onSidecarElementsReady(uint32_t /*session_model_id*/,
                                             std::vector<ElementTableRecord> elements,
                                             std::string string_table) {
    auto string_from_table = [&](uint32_t offset, uint32_t length) -> QString {
        if (length == 0 || offset + length > string_table.size()) return {};
        return QString::fromStdString(string_table.substr(offset, length));
    };

    for (const auto& packed_element : elements) {
        BasicElementInfo info;
        info.object_id = packed_element.object_id;
        info.session_model_id = packed_element.session_model_id;
        info.ifc_id = packed_element.ifc_id;
        info.guid = string_from_table(packed_element.guid_offset, packed_element.guid_length);
        info.name = string_from_table(packed_element.name_offset, packed_element.name_length);
        info.type = string_from_table(packed_element.type_offset, packed_element.type_length);
        elements_[info.object_id] = info;
    }
}

void ElementRegistry::onStreamedElementsReady(uint32_t /*session_model_id*/, std::vector<ElementInfo> elements) {
    for (const auto& element : elements) {
        BasicElementInfo info;
        info.object_id = element.object_id;
        info.session_model_id = element.session_model_id;
        info.ifc_id = element.ifc_id;
        info.guid = QString::fromStdString(element.guid);
        info.name = QString::fromStdString(element.name);
        info.type = QString::fromStdString(element.type);
        elements_[info.object_id] = info;
    }
}

} // namespace bonsaiviewer