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#include "rulesevaluationcontext.h"

#include "artifact.h"
#include "rulecommands.h"
#include "transformer.h"
#include <language/language.h>
#include <language/scriptengine.h>
#include <logging/translator.h>
#include <tools/error.h>
#include <tools/progressobserver.h>
#include <tools/qbsassert.h>

#include <QtCore/qvariant.h>

namespace qbs {
namespace Internal {

RulesEvaluationContext::RulesEvaluationContext(const Logger &logger)
    : m_logger(logger),
      m_engine(new ScriptEngine(m_logger, EvalContext::RuleExecution)),
      m_observer(0),
      m_initScopeCalls(0)
{
    m_prepareScriptScope = m_engine->newObject();
    m_prepareScriptScope.setPrototype(m_engine->globalObject());
    ProcessCommand::setupForJavaScript(m_prepareScriptScope);
    JavaScriptCommand::setupForJavaScript(m_prepareScriptScope);
}

RulesEvaluationContext::~RulesEvaluationContext()
{
    delete m_engine;
}

void RulesEvaluationContext::initializeObserver(const QString &description, int maximumProgress)
{
    if (m_observer)
        m_observer->initialize(description, maximumProgress);
}

void RulesEvaluationContext::incrementProgressValue()
{
    if (m_observer)
        m_observer->incrementProgressValue();
}

void RulesEvaluationContext::checkForCancelation()
{
    if (Q_UNLIKELY(m_observer && m_observer->canceled()))
        throw ErrorInfo(Tr::tr("Build canceled."));
}

void RulesEvaluationContext::initScope()
{
    if (m_initScopeCalls++ > 0)
        return;

    m_engine->setActive(true);
    m_scope = m_engine->newObject();
    m_scope.setPrototype(m_prepareScriptScope);
    m_engine->setGlobalObject(m_scope);
}

void RulesEvaluationContext::cleanupScope()
{
    QBS_CHECK(m_initScopeCalls > 0);
    if (--m_initScopeCalls > 0)
        return;

    m_scope = QScriptValue();
    m_engine->setGlobalObject(m_prepareScriptScope.prototype());
    m_engine->setActive(false);
}

RulesEvaluationContext::Scope::Scope(RulesEvaluationContext *evalContext)
    : m_evalContext(evalContext)
{
    evalContext->initScope();
}

RulesEvaluationContext::Scope::~Scope()
{
    m_evalContext->cleanupScope();
}

} // namespace Internal
} // namespace qbs
