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#include "optionsparser.h"

#include <QtCore/QCoreApplication>

using namespace ExtensionSystem;
using namespace ExtensionSystem::Internal;

static const char *END_OF_OPTIONS = "--";
const char *OptionsParser::NO_LOAD_OPTION = "-noload";
const char *OptionsParser::TEST_OPTION = "-test";

OptionsParser::OptionsParser(const QStringList &args,
        const QMap<QString, bool> &appOptions,
        QMap<QString, QString> *foundAppOptions,
        QString *errorString,
        PluginManagerPrivate *pmPrivate)
    : m_args(args), m_appOptions(appOptions),
      m_foundAppOptions(foundAppOptions),
      m_errorString(errorString),
      m_pmPrivate(pmPrivate),
      m_it(m_args.constBegin()),
      m_end(m_args.constEnd()),
      m_isDependencyRefreshNeeded(false),
      m_hasError(false)
{
    ++m_it; // jump over program name
    if (m_errorString)
        m_errorString->clear();
    if (m_foundAppOptions)
        m_foundAppOptions->clear();
    m_pmPrivate->arguments.clear();
}

bool OptionsParser::parse()
{
    while (!m_hasError) {
        if (!nextToken()) // move forward
            break;
        if (checkForEndOfOptions())
            break;
        if (checkForNoLoadOption())
            continue;
        if (checkForTestOption())
            continue;
        if (checkForAppOption())
            continue;
        if (checkForPluginOption())
            continue;
        if (checkForUnknownOption())
            break;
        // probably a file or something
        m_pmPrivate->arguments << m_currentArg;
    }
    if (m_isDependencyRefreshNeeded)
        m_pmPrivate->resolveDependencies();
    return !m_hasError;
}

bool OptionsParser::checkForEndOfOptions()
{
    if (m_currentArg != QLatin1String(END_OF_OPTIONS))
        return false;
    while (nextToken()) {
        m_pmPrivate->arguments << m_currentArg;
    }
    return true;
}

bool OptionsParser::checkForTestOption()
{
    if (m_currentArg != QLatin1String(TEST_OPTION))
        return false;
    if (nextToken(RequiredToken)) {
        PluginSpec *spec = m_pmPrivate->pluginByName(m_currentArg);
        if (!spec) {
            if (m_errorString)
                *m_errorString = QCoreApplication::translate("PluginManager",
                                                             "The plugin '%1' does not exist.").arg(m_currentArg);
            m_hasError = true;
        } else {
            m_pmPrivate->testSpecs.append(spec);
        }
    }
    return true;
}

bool OptionsParser::checkForNoLoadOption()
{
    if (m_currentArg != QLatin1String(NO_LOAD_OPTION))
        return false;
    if (nextToken(RequiredToken)) {
        PluginSpec *spec = m_pmPrivate->pluginByName(m_currentArg);
        if (!spec) {
            if (m_errorString)
                *m_errorString = QCoreApplication::translate("PluginManager",
                                                             "The plugin '%1' does not exist.").arg(m_currentArg);
            m_hasError = true;
        } else {
            m_pmPrivate->pluginSpecs.removeAll(spec);
            delete spec;
            m_isDependencyRefreshNeeded = true;
        }
    }
    return true;
}

bool OptionsParser::checkForAppOption()
{
    if (!m_appOptions.contains(m_currentArg))
        return false;
    QString option = m_currentArg;
    QString argument;
    if (m_appOptions.value(m_currentArg) && nextToken(RequiredToken)) {
        //argument required
        argument = m_currentArg;
    }
    if (m_foundAppOptions)
        m_foundAppOptions->insert(option, argument);
    return true;
}

bool OptionsParser::checkForPluginOption()
{
    bool requiresParameter;
    PluginSpec *spec = m_pmPrivate->pluginForOption(m_currentArg, &requiresParameter);
    if (!spec)
        return false;
    spec->addArgument(m_currentArg);
    if (requiresParameter && nextToken(RequiredToken)) {
        spec->addArgument(m_currentArg);
    }
    return true;
}

bool OptionsParser::checkForUnknownOption()
{
    if (!m_currentArg.startsWith(QLatin1Char('-')))
        return false;
    if (m_errorString)
        *m_errorString = QCoreApplication::translate("PluginManager",
                                                     "Unknown option %1").arg(m_currentArg);
    m_hasError = true;
    return true;
}

bool OptionsParser::nextToken(OptionsParser::TokenType type)
{
    if (m_it == m_end) {
        if (type == OptionsParser::RequiredToken) {
            m_hasError = true;
            if (m_errorString)
                *m_errorString = QCoreApplication::translate("PluginManager",
                                                             "The option %1 requires an argument.").arg(m_currentArg);
        }
        return false;
    }
    m_currentArg = *m_it;
    ++m_it;
    return true;
}