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#include "jobs.h"

#include "internaljobs.h"
#include "project_p.h"
#include <language/language.h>
#include <tools/launcherinterface.h>
#include <tools/qbsassert.h>

#include <QtCore/qtimer.h>

namespace qbs {
using namespace Internal;

/*!
 * \class AbstractJob
 * \brief The \c AbstractJob class represents an operation relating to a \c Project.
 * Concrete child classes of \c AbstractJob are created by factory functions in the \c Project
 * class. The respective objects represent an operation that is started automatically
 * and is considered "running" until the \c finished() signal has been emitted. Afterwards,
 * callers can find out whether the operation was successful by calling \c hasError(). While
 * the operation is going on, progress information is being provided via \c taskStarted() and
 * \c taskProgress.
 * Note that though a job is being started automatically by its factory function, you are guaranteed
 * to recevieve all signals it emits if you connect to it right after getting the object from the
 * creating function.
 * \sa Project
 */

/*!
 * \enum AbstractJob::State
 * This enum type specifies which states a job can be in.
 * \value StateRunning The respective operation is ongoing.
 * \value StateCanceling The job has been requested to cancel via \c AbstractJob::cancel(),
 *        but the \c AbstractJob::finished() signal has not been emitted yet.
 * \value StateFinished The operation has finished and the \c AbstractJob::finished() signal
 *                      has been emitted.
 */

 /*!
  * \fn AbstractJob::State AbstractJob::state() const
  * \brief Returns the current state of the operation.
  */

 /*!
  * \fn bool AbstractJob::hasError() const
  * \brief Returns true if the operation has finished with an error, otherwise returns false.
  * This function should not be called before the \c finished() signal has been emitted.
  */

/*!
 * \fn void AbstractJob::taskStarted(const QString &description, int maximumProgressValue, qbs::AbstractJob *job)
 * \brief Indicates that a new task has been started.
 * The \a description parameter is a string intended for presentation to a user.
 * The \a maximumProgressValue parameter indicates the maximum value to which subsequent values of
 * \c taskProgress() will go.
 * This signal is typically emitted exactly once for a job that finishes successfully. However,
 * operations might emit it several times if they are made up of subtasks whose overall effort
 * cannot be determined in advance.
 * \sa AbstractJob::taskProgress()
 */

/*!
 * \fn void taskProgress(int newProgressValue, qbs::AbstractJob *job)
 * \brief Indicates progress in executing the operation.
 * The \a newProgressValue parameter represents the current progress. It is always greater than
 * zero, strictly increasing and goes up to the \c maximumProgressValue argument of the last
 * call to \c taskStarted().
 * \sa AbstractJob::taskStarted()
 */

 /*!
  * \fn void finished(bool success, qbs::AbstractJob *job)
  * \brief Indicates that the operation has finished.
  * Check the \a success parameter to find out whether everything went fine or an error occurred.
  */

AbstractJob::AbstractJob(InternalJob *internalJob, QObject *parent)
    : QObject(parent), m_internalJob(internalJob)
{
    m_internalJob->setParent(this);
    connect(m_internalJob, &InternalJob::newTaskStarted,
            this, &AbstractJob::handleTaskStarted, Qt::QueuedConnection);
    connect(m_internalJob, &InternalJob::totalEffortChanged,
            this, &AbstractJob::handleTotalEffortChanged);
    connect(m_internalJob, &InternalJob::taskProgress,
            this, &AbstractJob::handleTaskProgress, Qt::QueuedConnection);
    connect(m_internalJob, &InternalJob::finished, this, &AbstractJob::handleFinished);
    m_state = StateRunning;
}

bool AbstractJob::lockProject(const TopLevelProjectPtr &project)
{
    // The API is not thread-safe, so we don't need a mutex here, as the API requests come in
    // synchronously.
    if (project->locked) {
        internalJob()->setError(tr("Cannot start a job while another one is in progress."));
        QTimer::singleShot(0, this, [this] { emit finished(false, this); });
        return false;
    }
    project->locked = true;
    m_project = project;
    return true;
}

void AbstractJob::unlockProject()
{
    if (!m_project)
        return;
    QBS_ASSERT(m_project->locked, return);
    m_project->locked = false;
}

/*!
 * \brief Destroys the object, canceling the operation if necessary.
 */
AbstractJob::~AbstractJob()
{
    m_internalJob->disconnect(this);
    cancel();
}

/*!
 * \brief Returns the error which caused this operation to fail, if it did fail.
 */
ErrorInfo AbstractJob::error() const
{
    if (m_error.hasError())
        return m_error;
    return internalJob()->error();
}

/*!
 * \brief Cancels this job.
 * Note that the job might not finish immediately. If you need to make sure it has actually
 * finished, wait for the \c finished() signal.
 * \sa AbstractJob::finished(AbstractJob *);
 */
void AbstractJob::cancel()
{
    if (m_state != StateRunning)
        return;
    m_state = StateCanceling;
    internalJob()->cancel();
}

void AbstractJob::handleTaskStarted(const QString &description, int maximumProgressValue)
{
    emit taskStarted(description, maximumProgressValue, this);
}

void AbstractJob::handleTotalEffortChanged(int totalEffort)
{
    emit totalEffortChanged(totalEffort, this);
}

void AbstractJob::handleTaskProgress(int newProgressValue)
{
    emit taskProgress(newProgressValue, this);
}

void AbstractJob::handleFinished()
{
    QBS_ASSERT(m_state != StateFinished, return);
    finish();
    m_state = StateFinished;
    unlockProject();
    emit finished(!error().hasError(), this);
}


/*!
 * \class SetupProjectJob
 * \brief The \c SetupProjectJob class represents an operation that reads a qbs project file and
 * creates a \c Project object from it.
 * Note that this job can emit the \c taskStarted() signal more than once.
 * \sa AbstractJob::taskStarted()
 */

SetupProjectJob::SetupProjectJob(const Logger &logger, QObject *parent)
    : AbstractJob(new InternalJobThreadWrapper(new InternalSetupProjectJob(logger)), parent)
{
}

/*!
 * \brief Returns the project resulting from this operation.
 * Note that the result is undefined if the job did not finish successfully.
 * \sa AbstractJob::hasError()
 */
Project SetupProjectJob::project() const
{
    const InternalJobThreadWrapper * const wrapper
            = qobject_cast<InternalJobThreadWrapper *>(internalJob());
    const InternalSetupProjectJob * const job
            = qobject_cast<InternalSetupProjectJob *>(wrapper->synchronousJob());
    return Project(job->project(), job->logger());
}

void SetupProjectJob::resolve(const Project &existingProject,
                              const SetupProjectParameters &parameters)
{
    m_existingProject = existingProject;
    const TopLevelProjectPtr &existingInternalProject
            = existingProject.d ? existingProject.d->internalProject : TopLevelProjectPtr();
    if (existingInternalProject && !lockProject(existingInternalProject))
        return;
    InternalJobThreadWrapper * const wrapper
            = qobject_cast<InternalJobThreadWrapper *>(internalJob());
    InternalSetupProjectJob * const job
            = qobject_cast<InternalSetupProjectJob *>(wrapper->synchronousJob());
    job->init(existingInternalProject, parameters);
    wrapper->start();
}

void SetupProjectJob::reportError(const ErrorInfo &error)
{
    InternalJobThreadWrapper * const wrapper
            = qobject_cast<InternalJobThreadWrapper *>(internalJob());
    InternalSetupProjectJob * const job
            = qobject_cast<InternalSetupProjectJob *>(wrapper->synchronousJob());
    job->reportError(error);
}

void SetupProjectJob::finish()
{
    // If the new project was successfully created, invalidate the existing one.
    // The invariant is that there must always be at most one valid Project object
    // for the same build directory, so that exclusive ownership of the build graph lock
    // is ensured.
    // We also need to invalidate the project if an error has occurred after the build data was
    // already transferred.
    if (m_existingProject.isValid()
            && (!error().hasError() || !m_existingProject.d->internalProject->buildData)) {
        m_existingProject.d->internalProject.clear();
    }
}

/*!
 * \class ProcessResult
 * \brief The \c ProcessResult class represents the result of one external program run by Qbs.
 *
 * The \c ProcessResult class represents all the information on one external program that was
 * run by Qbs. It includes the command line used to start the program, the working directory
 * as well as output and exit codes.
 */

/*!
 * \class BuildJob
 * \brief The \c BuildJob class represents a build operation.
 */

/*!
 * \fn void BuildJob::reportCommandDescription(const QString &highlight, const QString &message)
 * \brief Signals that a new command is being worked on.
 * The \a highlight parameter is used to decide on the colors and font styles to be used to
 * print the message.
 * The \a message parameter is the localized message to print.
 */

/*!
 * \fn void BuildJob::reportProcessResult(const qbs::ProcessResult &result)
 * \brief Signals that an external command has finished.
 * The \a result parameter contains all details on the process that was run by Qbs.
 */

BuildJob::BuildJob(const Logger &logger, QObject *parent)
    : AbstractJob(new InternalBuildJob(logger), parent)
{
    connect(&LauncherInterface::instance(), &LauncherInterface::errorOccurred,
            this, &BuildJob::handleLauncherError);
    InternalBuildJob *job = static_cast<InternalBuildJob *>(internalJob());
    connect(job, &BuildGraphTouchingJob::reportCommandDescription,
            this, &BuildJob::reportCommandDescription);
    connect(job, &BuildGraphTouchingJob::reportProcessResult,
            this, &BuildJob::reportProcessResult);
}

void BuildJob::build(const TopLevelProjectPtr &project, const QList<ResolvedProductPtr> &products,
                     const BuildOptions &options)
{
    if (!lockProject(project))
        return;
    LauncherInterface::startLauncher();
    qobject_cast<InternalBuildJob *>(internalJob())->build(project, products, options);
}

void BuildJob::handleLauncherError(const ErrorInfo &error)
{
    setError(error);
    cancel();
}

void BuildJob::finish()
{
    LauncherInterface::stopLauncher();
}


/*!
 * \class CleanJob
 * \brief The \c CleanJob class represents an operation removing build artifacts.
 */

CleanJob::CleanJob(const Logger &logger, QObject *parent)
    : AbstractJob(new InternalJobThreadWrapper(new InternalCleanJob(logger)), parent)
{
}

void CleanJob::clean(const TopLevelProjectPtr &project, const QList<ResolvedProductPtr> &products,
                     const qbs::CleanOptions &options)
{
    if (!lockProject(project))
        return;
    InternalJobThreadWrapper * wrapper = qobject_cast<InternalJobThreadWrapper *>(internalJob());
    qobject_cast<InternalCleanJob *>(wrapper->synchronousJob())->init(project, products, options);
    wrapper->start();
}

/*!
 * \class InstallJob
 * \brief The \c InstallJob class represents an operation installing files.
 */

InstallJob::InstallJob(const Logger &logger, QObject *parent)
    : AbstractJob(new InternalJobThreadWrapper(new InternalInstallJob(logger)), parent)
{
}

void InstallJob::install(const TopLevelProjectPtr &project,
                         const QList<ResolvedProductPtr> &products, const InstallOptions &options)
{
    if (!lockProject(project))
        return;
    InternalJobThreadWrapper *wrapper = qobject_cast<InternalJobThreadWrapper *>(internalJob());
    InternalInstallJob *installJob = qobject_cast<InternalInstallJob *>(wrapper->synchronousJob());
    installJob->init(project, products, options);
    wrapper->start();
}

} // namespace qbs
