refactor+fix: Make FTB install task similar to other install tasks

In particular, this changes the order so that the instance gets created
before downloading the mods (like other install tasks), and the mod download
directly puts the files in the staging folder (like the others), instead
of that weird makeCached and copy stuff.

This fixes some issues with modpack downloads from FTB, like creating an
instance with no mods in it.

Signed-off-by: flow <flowlnlnln@gmail.com>

2 files changed, 64 insertions, 87 deletions

diff --git a/launcher/modplatform/modpacksch/FTBPackInstallTask.cpp b/launcher/modplatform/modpacksch/FTBPackInstallTask.cpp
index 97ce1dc6..cc926d45 100644
--- a/launcher/modplatform/modpacksch/FTBPackInstallTask.cpp
+++ b/launcher/modplatform/modpacksch/FTBPackInstallTask.cpp
@@ -58,6 +58,9 @@ PackInstallTask::PackInstallTask(Modpack pack, QString version, QWidget* parent)
 
 bool PackInstallTask::abort()
 {
+    if (!canAbort())
+        return false;
+
     bool aborted = true;
 
     if (m_net_job)
@@ -65,14 +68,12 @@ bool PackInstallTask::abort()
     if (m_mod_id_resolver_task)
         aborted &= m_mod_id_resolver_task->abort();
 
-    if (aborted)
-        emitAborted();
-
-    return aborted;
+    return aborted ? InstanceTask::abort() : false;
 }
 
 void PackInstallTask::executeTask()
 {
+    setAbortable(true);
     setStatus(tr("Getting the manifest..."));
 
     // Find pack version
@@ -129,6 +130,7 @@ void PackInstallTask::onManifestDownloadSucceeded()
 
 void PackInstallTask::resolveMods()
 {
+    setAbortable(true);
     setStatus(tr("Resolving mods..."));
     setProgress(0, 100);
 
@@ -169,8 +171,6 @@ void PackInstallTask::resolveMods()
 
 void PackInstallTask::onResolveModsSucceeded()
 {
-    m_abortable = false;
-
     QString text;
     QList<QUrl> urls;
     auto anyBlocked = false;
@@ -209,94 +209,23 @@ void PackInstallTask::onResolveModsSucceeded()
                                                    urls);
 
         if (message_dialog->exec() == QDialog::Accepted)
-            downloadPack();
+            createInstance();
         else
             abort();
     } else {
-        downloadPack();
-    }
-}
-
-void PackInstallTask::downloadPack()
-{
-    setStatus(tr("Downloading mods..."));
-
-    auto* jobPtr = new NetJob(tr("Mod download"), APPLICATION->network());
-    for (auto const& file : m_version.files) {
-        if (file.serverOnly || file.url.isEmpty())
-            continue;
-
-        QFileInfo file_info(file.name);
-        auto cacheName = file_info.completeBaseName() + "-" + file.sha1 + "." + file_info.suffix();
-
-        auto entry = APPLICATION->metacache()->resolveEntry("ModpacksCHPacks", cacheName);
-        entry->setStale(true);
-
-        auto relpath = FS::PathCombine("minecraft", file.path, file.name);
-        auto path = FS::PathCombine(m_stagingPath, relpath);
-
-        if (m_files_to_copy.contains(path)) {
-            qWarning() << "Ignoring" << file.url << "as a file of that path is already downloading.";
-            continue;
-        }
-
-        qDebug() << "Will download" << file.url << "to" << path;
-        m_files_to_copy[path] = entry->getFullPath();
-
-        auto dl = Net::Download::makeCached(file.url, entry);
-        if (!file.sha1.isEmpty()) {
-            auto rawSha1 = QByteArray::fromHex(file.sha1.toLatin1());
-            dl->addValidator(new Net::ChecksumValidator(QCryptographicHash::Sha1, rawSha1));
-        }
-
-        jobPtr->addNetAction(dl);
+        createInstance();
     }
-
-    connect(jobPtr, &NetJob::succeeded, this, &PackInstallTask::onModDownloadSucceeded);
-    connect(jobPtr, &NetJob::failed, this, &PackInstallTask::onModDownloadFailed);
-    connect(jobPtr, &NetJob::progress, this, &PackInstallTask::setProgress);
-
-    m_net_job = jobPtr;
-    jobPtr->start();
-
-    m_abortable = true;
 }
 
-void PackInstallTask::onModDownloadSucceeded()
+void PackInstallTask::createInstance()
 {
-    m_net_job.reset();
-    install();
-}
-
-void PackInstallTask::install()
-{
-    setStatus(tr("Copying modpack files..."));
-    setProgress(0, m_files_to_copy.size());
-    QCoreApplication::processEvents();
-
-    m_abortable = false;
-
-    int i = 0;
-    for (auto iter = m_files_to_copy.constBegin(); iter != m_files_to_copy.constEnd(); iter++) {
-        auto& to = iter.key();
-        auto& from = iter.value();
-        FS::copy fileCopyOperation(from, to);
-        if (!fileCopyOperation()) {
-            qWarning() << "Failed to copy" << from << "to" << to;
-            emitFailed(tr("Failed to copy files"));
-            return;
-        }
-
-        setProgress(i++, m_files_to_copy.size());
-        QCoreApplication::processEvents();
-    }
+    setAbortable(false);
 
-    setStatus(tr("Installing modpack..."));
+    setStatus(tr("Creating the instance..."));
     QCoreApplication::processEvents();
 
     auto instanceConfigPath = FS::PathCombine(m_stagingPath, "instance.cfg");
     auto instanceSettings = std::make_shared<INISettingsObject>(instanceConfigPath);
-    instanceSettings->suspendSave();
 
     MinecraftInstance instance(m_globalSettings, instanceSettings, m_stagingPath);
     auto components = instance.getPackProfile();
@@ -337,8 +266,53 @@ void PackInstallTask::install()
     instance.setName(name());
     instance.setIconKey(m_instIcon);
     instance.setManagedPack("modpacksch", QString::number(m_pack.id), m_pack.name, QString::number(m_version.id), m_version.name);
-    instanceSettings->resumeSave();
 
+    instance.saveNow();
+
+    onCreateInstanceSucceeded();
+}
+
+void PackInstallTask::onCreateInstanceSucceeded()
+{
+    downloadPack();
+}
+
+void PackInstallTask::downloadPack()
+{
+    setAbortable(true);
+
+    setStatus(tr("Downloading mods..."));
+
+    auto* jobPtr = new NetJob(tr("Mod download"), APPLICATION->network());
+    for (auto const& file : m_version.files) {
+        if (file.serverOnly || file.url.isEmpty())
+            continue;
+
+        auto path = FS::PathCombine(m_stagingPath, ".minecraft", file.path, file.name);
+        qDebug() << "Will try to download" << file.url << "to" << path;
+
+        QFileInfo file_info(file.name);
+
+        auto dl = Net::Download::makeFile(file.url, path);
+        if (!file.sha1.isEmpty()) {
+            auto rawSha1 = QByteArray::fromHex(file.sha1.toLatin1());
+            dl->addValidator(new Net::ChecksumValidator(QCryptographicHash::Sha1, rawSha1));
+        }
+
+        jobPtr->addNetAction(dl);
+    }
+
+    connect(jobPtr, &NetJob::succeeded, this, &PackInstallTask::onModDownloadSucceeded);
+    connect(jobPtr, &NetJob::failed, this, &PackInstallTask::onModDownloadFailed);
+    connect(jobPtr, &NetJob::progress, this, &PackInstallTask::setProgress);
+
+    m_net_job = jobPtr;
+    jobPtr->start();
+}
+
+void PackInstallTask::onModDownloadSucceeded()
+{
+    m_net_job.reset();
     emitSucceeded();
 }
 
@@ -352,6 +326,10 @@ void PackInstallTask::onResolveModsFailed(QString reason)
     m_net_job.reset();
     emitFailed(reason);
 }
+void PackInstallTask::onCreateInstanceFailed(QString reason)
+{
+    emitFailed(reason);
+}
 void PackInstallTask::onModDownloadFailed(QString reason)
 {
     m_net_job.reset();
diff --git a/launcher/modplatform/modpacksch/FTBPackInstallTask.h b/launcher/modplatform/modpacksch/FTBPackInstallTask.h
index e63ca0df..7c6fbeb9 100644
--- a/launcher/modplatform/modpacksch/FTBPackInstallTask.h
+++ b/launcher/modplatform/modpacksch/FTBPackInstallTask.h
@@ -56,7 +56,6 @@ public:
     explicit PackInstallTask(Modpack pack, QString version, QWidget* parent = nullptr);
     ~PackInstallTask() override = default;
 
-    bool canAbort() const override { return m_abortable; }
     bool abort() override;
 
 protected:
@@ -65,20 +64,20 @@ protected:
 private slots:
     void onManifestDownloadSucceeded();
     void onResolveModsSucceeded();
+    void onCreateInstanceSucceeded();
     void onModDownloadSucceeded();
 
     void onManifestDownloadFailed(QString reason);
     void onResolveModsFailed(QString reason);
+    void onCreateInstanceFailed(QString reason);
     void onModDownloadFailed(QString reason);
 
 private:
     void resolveMods();
+    void createInstance();
     void downloadPack();
-    void install();
 
 private:
-    bool m_abortable = true;
-
     NetJob::Ptr m_net_job = nullptr;
     shared_qobject_ptr<Flame::FileResolvingTask> m_mod_id_resolver_task = nullptr;