//    Copyright (C) 2020 Jakub Melka
//
//    This file is part of PdfForQt.
//
//    PdfForQt 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
//    (at your option) any later version.
//
//    PdfForQt 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 PDFForQt.  If not, see <https://www.gnu.org/licenses/>.

#include "pdftoolabstractapplication.h"

#include <QCommandLineParser>

namespace pdftool
{

class PDFToolHelpApplication : public PDFToolAbstractApplication
{
public:
    PDFToolHelpApplication() : PDFToolAbstractApplication(true) { }

    virtual QString getStandardString(StandardString standardString) const override;
    virtual int execute(const PDFToolOptions& options) override;
    virtual Options getOptionsFlags() const override;
};

static PDFToolHelpApplication s_helpApplication;

QString PDFToolHelpApplication::getStandardString(StandardString standardString) const
{
    switch (standardString)
    {
        case Command:
            return "help";

        case Name:
            return PDFToolTranslationContext::tr("Help");

        case Description:
            return PDFToolTranslationContext::tr("Show list of all available commands.");

        default:
            Q_ASSERT(false);
            break;
    }

    return QString();
}

int PDFToolHelpApplication::execute(const PDFToolOptions& options)
{
    PDFOutputFormatter formatter(options.outputStyle);
    formatter.beginDocument("help", PDFToolTranslationContext::tr("PDFTool help"));
    formatter.endl();

    formatter.beginTable("commands", PDFToolTranslationContext::tr("List of available commands"));

    // Table header
    formatter.beginTableHeaderRow("header");
    formatter.writeTableHeaderColumn("command", PDFToolTranslationContext::tr("Command"));
    formatter.writeTableHeaderColumn("tool", PDFToolTranslationContext::tr("Tool"));
    formatter.writeTableHeaderColumn("description", PDFToolTranslationContext::tr("Description"));
    formatter.endTableHeaderRow();

    struct Info
    {
        bool operator<(const Info& other) const
        {
            return command < other.command;
        }

        QString command;
        QString name;
        QString description;
    };

    std::vector<Info> infos;
    for (PDFToolAbstractApplication* application : PDFToolApplicationStorage::getApplications())
    {
        Info info;

        info.command = application->getStandardString(Command);
        info.name = application->getStandardString(Name);
        info.description = application->getStandardString(Description);

        infos.emplace_back(qMove(info));
    }
    qSort(infos);

    for (const Info& info : infos)
    {
        formatter.beginTableRow("command");
        formatter.writeTableColumn("command", info.command);
        formatter.writeTableColumn("name", info.name);
        formatter.writeTableColumn("description", info.description);
        formatter.endTableRow();
    }

    formatter.endTable();

    formatter.endDocument();

    PDFConsole::writeText(formatter.getString());
    return ExitSuccess;
}

PDFToolAbstractApplication::Options PDFToolHelpApplication::getOptionsFlags() const
{
    return ConsoleFormat;
}

PDFToolAbstractApplication::PDFToolAbstractApplication(bool isDefault)
{
    PDFToolApplicationStorage::registerApplication(this, isDefault);
}

void PDFToolAbstractApplication::initializeCommandLineParser(QCommandLineParser* parser) const
{
    Options optionFlags = getOptionsFlags();

    if (optionFlags.testFlag(ConsoleFormat))
    {
        parser->addOption(QCommandLineOption("console-format", "Console output text format (valid values: text|xml|html).", "console-format", "text"));
    }
}

PDFToolOptions PDFToolAbstractApplication::getOptions(QCommandLineParser* parser) const
{
    PDFToolOptions options;

    Options optionFlags = getOptionsFlags();
    if (optionFlags.testFlag(ConsoleFormat))
    {
        QString consoleFormat = parser->value("console-format");
        if (consoleFormat == "text")
        {
            options.outputStyle = PDFOutputFormatter::Style::Text;
        }
        else if (consoleFormat == "xml")
        {
            options.outputStyle = PDFOutputFormatter::Style::Xml;
        }
        else if (consoleFormat == "html")
        {
            options.outputStyle = PDFOutputFormatter::Style::Html;
        }
        else
        {
            options.outputStyle = PDFOutputFormatter::Style::Text;
        }
    }

    return options;
}

PDFToolAbstractApplication* PDFToolApplicationStorage::getApplicationByCommand(const QString& command)
{
    for (PDFToolAbstractApplication* application : getInstance()->m_applications)
    {
        if (application->getStandardString(PDFToolAbstractApplication::Command) == command)
        {
            return application;
        }
    }

    return nullptr;
}

void PDFToolApplicationStorage::registerApplication(PDFToolAbstractApplication* application, bool isDefault)
{
    PDFToolApplicationStorage* storage = getInstance();
    storage->m_applications.push_back(application);

    if (isDefault)
    {
        storage->m_defaultApplication = application;
    }
}

PDFToolAbstractApplication* PDFToolApplicationStorage::getDefaultApplication()
{
    return getInstance()->m_defaultApplication;
}

const std::vector<PDFToolAbstractApplication*>& PDFToolApplicationStorage::getApplications()
{
    return getInstance()->m_applications;
}

PDFToolApplicationStorage* PDFToolApplicationStorage::getInstance()
{
    static PDFToolApplicationStorage storage;
    return &storage;
}

}   // pdftool