refactor: extract common code in mod pages and model

This creates a hierarchy in which ModPage and ModModel are the parents
of every mod provider, providing the basic functionality common to all
of them.

It also imposes a unique .ui file (they were already equal before, just
duplicated basically) on all mod providers.

launcher/ui/pages/modplatform/ModPage.cpp

@@ -0,0 +1,152 @@
+#include "ModPage.h"
+#include "ui_ModPage.h"
+
+#include <QKeyEvent>
+
+#include "ui/dialogs/ModDownloadDialog.h"
+
+ModPage::ModPage(ModDownloadDialog* dialog, BaseInstance* instance)
+    : QWidget(dialog), m_instance(instance), ui(new Ui::ModPage), dialog(dialog)
+{
+    ui->setupUi(this);
+    connect(ui->searchButton, &QPushButton::clicked, this, &ModPage::triggerSearch);
+    ui->searchEdit->installEventFilter(this);
+
+    ui->versionSelectionBox->view()->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
+    ui->versionSelectionBox->view()->parentWidget()->setMaximumHeight(300);
+
+}
+
+ModPage::~ModPage()
+{
+    delete ui;
+}
+
+void ModPage::openedImpl()
+{
+    updateSelectionButton();
+    triggerSearch();
+}
+
+bool ModPage::eventFilter(QObject* watched, QEvent* event)
+{
+    if (watched == ui->searchEdit && event->type() == QEvent::KeyPress) {
+        QKeyEvent* keyEvent = static_cast<QKeyEvent*>(event);
+        if (keyEvent->key() == Qt::Key_Return) {
+            triggerSearch();
+            keyEvent->accept();
+            return true;
+        }
+    }
+    return QWidget::eventFilter(watched, event);
+}
+
+void ModPage::updateSelectionButton()
+{
+    if (!isOpened || selectedVersion < 0) {
+        ui->modSelectionButton->setEnabled(false);
+        return;
+    }
+
+    ui->modSelectionButton->setEnabled(true);
+    auto& version = current.versions[selectedVersion];
+    if (!dialog->isModSelected(current.name, version.fileName)) {
+        ui->modSelectionButton->setText(tr("Select mod for download"));
+    } else {
+        ui->modSelectionButton->setText(tr("Deselect mod for download"));
+    }
+}
+
+void ModPage::triggerSearch()
+{
+    listModel->searchWithTerm(ui->searchEdit->text(), ui->sortByBox->currentIndex());
+}
+
+void ModPage::onSelectionChanged(QModelIndex first, QModelIndex second)
+{
+    ui->versionSelectionBox->clear();
+
+    if (!first.isValid()) { return; }
+
+    current = listModel->data(first, Qt::UserRole).value<ModPlatform::IndexedPack>();
+    QString text = "";
+    QString name = current.name;
+
+    if (current.websiteUrl.isEmpty())
+        text = name;
+    else
+        text = "<a href=\"" + current.websiteUrl + "\">" + name + "</a>";
+    
+    if (!current.authors.empty()) {
+        auto authorToStr = [](ModPlatform::ModpackAuthor& author) {
+            if (author.url.isEmpty()) { return author.name; }
+            return QString("<a href=\"%1\">%2</a>").arg(author.url, author.name);
+        };
+        QStringList authorStrs;
+        for (auto& author : current.authors) {
+            authorStrs.push_back(authorToStr(author));
+        }
+        text += "<br>" + tr(" by ") + authorStrs.join(", ");
+    }
+    text += "<br><br>";
+
+    ui->packDescription->setHtml(text + current.description);
+
+    if (!current.versionsLoaded) {
+        qDebug() << QString("Loading %1 mod versions").arg(debugName());
+
+        ui->modSelectionButton->setText(tr("Loading versions..."));
+        ui->modSelectionButton->setEnabled(false);
+
+        auto netJob = new NetJob(QString("%1::ModVersions(%2)").arg(debugName()).arg(current.name), APPLICATION->network());
+        auto response = new QByteArray();
+        QString addonId = current.addonId.toString();
+        //FIXME
+        if(debugName() == "Modrinth")
+            netJob->addNetAction(
+                Net::Download::makeByteArray(QString("https://api.modrinth.com/v2/project/%1/version").arg(addonId), response));
+        else
+            netJob->addNetAction(
+                Net::Download::makeByteArray(QString("https://addons-ecs.forgesvc.net/api/v2/addon/%1/files").arg(addonId), response));
+
+        QObject::connect(netJob, &NetJob::succeeded, this, [this, response, addonId]{
+            onModVersionSucceed(this, response, addonId);
+        });
+
+        QObject::connect(netJob, &NetJob::finished, this, [response, netJob] {
+            netJob->deleteLater();
+            delete response;
+        });
+
+        netJob->start();
+    } else {
+        for (int i = 0; i < current.versions.size(); i++) {
+            ui->versionSelectionBox->addItem(current.versions[i].version, QVariant(i));
+        }
+        if (ui->versionSelectionBox->count() == 0) { ui->versionSelectionBox->addItem(tr("No Valid Version found !"), QVariant(-1)); }
+
+        updateSelectionButton();
+    }
+}
+
+void ModPage::onVersionSelectionChanged(QString data)
+{
+    if (data.isNull() || data.isEmpty()) {
+        selectedVersion = -1;
+        return;
+    }
+    selectedVersion = ui->versionSelectionBox->currentData().toInt();
+    updateSelectionButton();
+}
+
+void ModPage::onModSelected()
+{
+    auto& version = current.versions[selectedVersion];
+    if (dialog->isModSelected(current.name, version.fileName)) {
+        dialog->removeSelectedMod(current.name);
+    } else {
+        dialog->addSelectedMod(current.name, new ModDownloadTask(version.downloadUrl, version.fileName, dialog->mods));
+    }
+
+    updateSelectionButton();
+}