// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0

#include "genericdirectuploadstep.h"
#include "abstractremotelinuxdeploystep.h"

#include "remotelinux_constants.h"
#include "remotelinuxtr.h"

#include <projectexplorer/buildstep.h>
#include <projectexplorer/buildsystem.h>
#include <projectexplorer/deployablefile.h>
#include <projectexplorer/deploymentdata.h>
#include <projectexplorer/devicesupport/filetransfer.h>
#include <projectexplorer/devicesupport/idevice.h>
#include <projectexplorer/projectexplorerconstants.h>
#include <projectexplorer/runconfigurationaspects.h>
#include <projectexplorer/target.h>

#include <utils/qtcprocess.h>
#include <utils/processinterface.h>
#include <utils/qtcassert.h>

#include <QDateTime>

using namespace ProjectExplorer;
using namespace QtTaskTree;
using namespace Utils;

namespace RemoteLinux::Internal {

const int MaxConcurrentStatCalls = 10;

struct UploadStorage
{
    QList<DeployableFile> deployableFiles;
    QList<DeployableFile> filesToUpload;
};

class GenericDirectUploadStep final : public AbstractRemoteLinuxDeployStep
{
public:
    GenericDirectUploadStep(BuildStepList *bsl, Id id)
        : AbstractRemoteLinuxDeployStep(bsl, id)
    {
        incremental.setSettingsKey("RemoteLinux.GenericDirectUploadStep.Incremental");
        incremental.setLabelText(Tr::tr("Incremental deployment"));
        incremental.setLabelPlacement(BoolAspect::LabelPlacement::AtCheckBox);
        incremental.setDefaultValue(true);

        ignoreMissingFiles.setSettingsKey("RemoteLinux.GenericDirectUploadStep.IgnoreMissingFiles");
        ignoreMissingFiles.setLabelText(Tr::tr("Ignore missing files"));
        ignoreMissingFiles.setLabelPlacement(BoolAspect::LabelPlacement::AtCheckBox);

        setInternalInitializer([this] {
            return isDeploymentPossible();
        });
    }

    GroupItem deployRecipe() final;

    QDateTime timestampFromStat(const DeployableFile &file, Process *statProc);

    using FilesToStat = std::function<QList<DeployableFile>(UploadStorage *)>;
    using StatEndHandler
          = std::function<void(UploadStorage *, const DeployableFile &, const QDateTime &)>;
    GroupItem statTask(UploadStorage *storage, const DeployableFile &file,
                       StatEndHandler statEndHandler);
    GroupItem statTree(const Storage<UploadStorage> &storage, FilesToStat filesToStat,
                       StatEndHandler statEndHandler);
    GroupItem uploadTask(const Storage<UploadStorage> &storage);

    BoolAspect incremental{this};
    BoolAspect ignoreMissingFiles{this};
};

static QList<DeployableFile> collectFilesToUpload(const DeployableFile &deployable)
{
    QList<DeployableFile> collected;
    FilePath localFile = deployable.localFilePath();
    if (localFile.isDir()) {
        const FilePaths files = localFile.dirEntries(QDir::Files | QDir::Dirs | QDir::NoDotAndDotDot);
        const QString remoteDir = deployable.remoteDirectory() + '/' + localFile.fileName();
        for (const FilePath &localFilePath : files)
            collected.append(collectFilesToUpload(DeployableFile(localFilePath, remoteDir)));
    } else {
        collected << deployable;
    }
    return collected;
}

QDateTime GenericDirectUploadStep::timestampFromStat(const DeployableFile &file,
                                                     Process *statProc)
{
    bool succeeded = false;
    QString error;
    if (statProc->error() == QProcess::FailedToStart) {
        error = Tr::tr("Failed to start \"stat\": %1").arg(statProc->errorString());
    } else if (statProc->exitStatus() == QProcess::CrashExit) {
        error = Tr::tr("\"stat\" crashed.");
    } else if (statProc->exitCode() != 0) {
        error = Tr::tr("\"stat\" failed with exit code %1: %2")
                .arg(statProc->exitCode()).arg(statProc->cleanedStdErr());
    } else {
        succeeded = true;
    }
    if (!succeeded) {
        addWarningMessage(Tr::tr("Failed to retrieve remote timestamp for file \"%1\". "
                                 "Incremental deployment will not work. Error message was: %2")
                              .arg(file.remoteFilePath(), error));
        return {};
    }
    const QString output = statProc->readAllStandardOutput().trimmed();
    const QString warningString(Tr::tr("Unexpected stat output for remote file \"%1\": %2")
                                .arg(file.remoteFilePath()).arg(output));
    if (!output.startsWith(file.remoteFilePath())) {
        addWarningMessage(warningString);
        return {};
    }
    const QStringList columns = output.mid(file.remoteFilePath().size() + 1).split(' ');
    if (columns.size() < 14) { // Normal Linux stat: 16 columns in total, busybox stat: 15 columns
        addWarningMessage(warningString);
        return {};
    }
    bool isNumber;
    const qint64 secsSinceEpoch = columns.at(11).toLongLong(&isNumber);
    if (!isNumber) {
        addWarningMessage(warningString);
        return {};
    }
    return QDateTime::fromSecsSinceEpoch(secsSinceEpoch);
}

GroupItem GenericDirectUploadStep::statTask(UploadStorage *storage,
                                            const DeployableFile &file,
                                            StatEndHandler statEndHandler)
{
    const auto onSetup = [this, file](Process &process) {
        // We'd like to use --format=%Y, but it's not supported by busybox.
        process.setCommand({deviceConfiguration()->filePath("stat"),
                            {"-t", Utils::ProcessArgs::quoteArgUnix(file.remoteFilePath())}});
    };
    const auto onDone = [this, storage, file, statEndHandler](const Process &process) {
        Process *proc = const_cast<Process *>(&process);
        const QDateTime timestamp = timestampFromStat(file, proc);
        statEndHandler(storage, file, timestamp);
    };
    return ProcessTask(onSetup, onDone);
}

GroupItem GenericDirectUploadStep::statTree(const Storage<UploadStorage> &storage,
                                            FilesToStat filesToStat, StatEndHandler statEndHandler)
{
    const auto onSetup = [this, storage, filesToStat, statEndHandler](QTaskTree &tree) {
        UploadStorage *storagePtr = storage.activeStorage();
        const QList<DeployableFile> files = filesToStat(storagePtr);
        GroupItems statList{finishAllAndSuccess, ParallelLimit(MaxConcurrentStatCalls)};
        for (const DeployableFile &file : std::as_const(files)) {
            QTC_ASSERT(file.isValid(), continue);
            statList.append(statTask(storagePtr, file, statEndHandler));
        }
        tree.setRecipe({statList});
    };
    return QTaskTreeTask(onSetup);
}

GroupItem GenericDirectUploadStep::uploadTask(const Storage<UploadStorage> &storage)
{
    const auto onSetup = [this, storage](FileTransfer &transfer) {
        if (storage->filesToUpload.isEmpty()) {
            addProgressMessage(Tr::tr("No files need to be uploaded."));
            return SetupResult::StopWithSuccess;
        }
        addProgressMessage(Tr::tr("%n file(s) need to be uploaded.", "",
                                  storage->filesToUpload.size()));
        FilesToTransfer files;
        for (const DeployableFile &file : std::as_const(storage->filesToUpload)) {
            if (!file.localFilePath().exists()) {
                const QString message = Tr::tr("Local file \"%1\" does not exist.")
                                              .arg(file.localFilePath().toUserOutput());
                if (ignoreMissingFiles()) {
                    addWarningMessage(message);
                    continue;
                }
                addErrorMessage(message);
                return SetupResult::StopWithError;
            }
            const FilePermissions permissions = file.isExecutable()
                ? FilePermissions::ForceExecutable : FilePermissions::Default;
            files.append({file.localFilePath(),
                          deviceConfiguration()->filePath(file.remoteFilePath()), permissions});
        }
        if (files.isEmpty()) {
            addProgressMessage(Tr::tr("No files need to be uploaded."));
            return SetupResult::StopWithSuccess;
        }
        transfer.setFilesToTransfer(files);
        QObject::connect(&transfer, &FileTransfer::progress,
                         this, &GenericDirectUploadStep::addProgressMessage);
        return SetupResult::Continue;
    };
    const auto onError = [this](const FileTransfer &transfer) {
        addErrorMessage(transfer.resultData().m_errorString);
    };

    return FileTransferTask(onSetup, onError, CallDoneFlag::OnError);
}

GroupItem GenericDirectUploadStep::deployRecipe()
{
    const Storage<UploadStorage> storage;

    const auto setupHandler = [this, storage] {
        const QList<DeployableFile> deployableFiles = buildSystem()->deploymentData().allFiles();
        QList<DeployableFile> collected;
        for (const DeployableFile &file : deployableFiles)
            collected.append(collectFilesToUpload(file));

        QTC_CHECK(collected.size() >= deployableFiles.size());
        if (collected.isEmpty()) {
            addSkipDeploymentMessage();
            return SetupResult::StopWithSuccess;
        }
        storage->deployableFiles = collected;
        return SetupResult::Continue;
    };

    const auto preFilesToStat = [this](UploadStorage *storage) {
        QList<DeployableFile> filesToStat;
        for (const DeployableFile &file : std::as_const(storage->deployableFiles)) {
            if (!incremental() || hasLocalFileChanged(file)) {
                storage->filesToUpload.append(file);
                continue;
            }
            filesToStat << file;
        }
        return filesToStat;
    };
    const auto preStatEndHandler = [this](UploadStorage *storage, const DeployableFile &file,
                                          const QDateTime &timestamp) {
        if (!timestamp.isValid() || hasRemoteFileChanged(file, timestamp))
            storage->filesToUpload.append(file);
    };

    const auto postFilesToStat = [](UploadStorage *storage) {
        return storage->filesToUpload;
    };
    const auto postStatEndHandler = [this](UploadStorage *storage, const DeployableFile &file,
                                           const QDateTime &timestamp) {
        Q_UNUSED(storage)
        if (timestamp.isValid())
            saveDeploymentTimeStamp(file, timestamp);
    };
    const auto doneHandler = [this] {
        addProgressMessage(Tr::tr("All files successfully deployed."));
    };

    const Group root {
        storage,
        onGroupSetup(setupHandler),
        statTree(storage, preFilesToStat, preStatEndHandler),
        uploadTask(storage),
        statTree(storage, postFilesToStat, postStatEndHandler),
        onGroupDone(doneHandler, CallDoneFlag::OnSuccess)
    };
    return root;
}

// Factory

class GenericDirectUploadStepFactory final : public BuildStepFactory
{
public:
    GenericDirectUploadStepFactory()
    {
        registerStep<GenericDirectUploadStep>(Constants::DirectUploadStepId);
        setDisplayName(Tr::tr("Upload files via SFTP"));
        setSupportedStepList(ProjectExplorer::Constants::BUILDSTEPS_DEPLOY);
        setSupportedDeviceType(RemoteLinux::Constants::GenericLinuxOsType);
    }
};

void setupGenericDirectUploadStep()
{
    static GenericDirectUploadStepFactory theGenericDirectUploadStepFactory;
}

} // RemoteLinux::Internal
