/* 
 * Copyright (C) 2025 Petr Mironychev
 *
 * This file is part of QodeAssist.
 *
 * QodeAssist 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 of the License, or
 * (at your option) any later version.
 *
 * QodeAssist 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 QodeAssist. If not, see <https://www.gnu.org/licenses/>.
 */

#include "RulesLoader.hpp"

#include <QDir>
#include <QFile>

#include <coreplugin/editormanager/editormanager.h>
#include <projectexplorer/project.h>
#include <projectexplorer/projectmanager.h>

namespace QodeAssist::LLMCore {

QString RulesLoader::loadRules(const QString &projectPath, RulesContext context)
{
    if (projectPath.isEmpty()) {
        return QString();
    }

    QString combined;
    QString basePath = projectPath + "/.qodeassist/rules";

    combined += loadAllMarkdownFiles(basePath + "/common");

    switch (context) {
    case RulesContext::Completions:
        combined += loadAllMarkdownFiles(basePath + "/completions");
        break;
    case RulesContext::Chat:
        combined += loadAllMarkdownFiles(basePath + "/chat");
        break;
    case RulesContext::QuickRefactor:
        combined += loadAllMarkdownFiles(basePath + "/quickrefactor");
        break;
    }

    return combined;
}

QString RulesLoader::loadRulesForProject(ProjectExplorer::Project *project, RulesContext context)
{
    if (!project) {
        return QString();
    }

    QString projectPath = getProjectPath(project);
    return loadRules(projectPath, context);
}

ProjectExplorer::Project *RulesLoader::getActiveProject()
{
    auto currentEditor = Core::EditorManager::currentEditor();
    if (currentEditor && currentEditor->document()) {
        Utils::FilePath filePath = currentEditor->document()->filePath();
        auto project = ProjectExplorer::ProjectManager::projectForFile(filePath);
        if (project) {
            return project;
        }
    }

    return ProjectExplorer::ProjectManager::startupProject();
}

QString RulesLoader::loadAllMarkdownFiles(const QString &dirPath)
{
    QString combined;
    QDir dir(dirPath);

    if (!dir.exists()) {
        return QString();
    }

    QStringList mdFiles = dir.entryList({"*.md"}, QDir::Files, QDir::Name);

    for (const QString &fileName : mdFiles) {
        QFile file(dir.filePath(fileName));
        if (file.open(QIODevice::ReadOnly | QIODevice::Text)) {
            combined += file.readAll();
            combined += "\n\n";
        }
    }

    return combined;
}

QString RulesLoader::getProjectPath(ProjectExplorer::Project *project)
{
    if (!project) {
        return QString();
    }

    return project->projectDirectory().toUrlishString();
}

} // namespace QodeAssist::LLMCore