qml: Implement UTXO snapshot loading infrastructure

- Add SnapshotQml class to encapsulate snapshot loading operations
- Integrate QML properties for UTXO snapshot management
- Wire up snapshot loading functionality with node interface

Author: D33r-Gee

Diff for: src/Makefile.qt.include

@@ -45,6 +45,7 @@ QT_MOC_CPP = \
   qml/models/moc_peerdetailsmodel.cpp \
   qml/models/moc_peerlistsortproxy.cpp \
   qml/models/moc_transaction.cpp \
+  qml/models/moc_snapshotqml.cpp \
   qml/models/moc_walletlistmodel.cpp \
   qml/models/moc_walletqmlmodel.cpp \
   qml/moc_appmode.cpp \
@@ -132,6 +133,7 @@ BITCOIN_QT_H = \
   qml/models/peerdetailsmodel.h \
   qml/models/peerlistsortproxy.h \
   qml/models/transaction.h \
+  qml/models/snapshotqml.h \
   qml/models/walletlistmodel.h \
   qml/models/walletqmlmodel.h \
   qml/appmode.h \
@@ -329,6 +331,7 @@ BITCOIN_QML_BASE_CPP = \
   qml/models/peerdetailsmodel.cpp \
   qml/models/peerlistsortproxy.cpp \
   qml/models/transaction.cpp \
+  qml/models/snapshotqml.cpp \
   qml/models/walletlistmodel.cpp \
   qml/models/walletqmlmodel.cpp \
   qml/imageprovider.cpp \

Diff for: src/qml/components/ConnectionSettings.qml

@@ -11,13 +11,13 @@ ColumnLayout {
     id: root
     signal next
     signal gotoSnapshot
-    property bool snapshotImported: false
-    function setSnapshotImported(imported) {
-        snapshotImported = imported
-    }
+    property bool snapshotImportCompleted: chainModel.isSnapshotActive
+    property bool onboarding: false
+
     spacing: 4
     Setting {
         id: gotoSnapshot
+        visible: !root.onboarding
         Layout.fillWidth: true
         header: qsTr("Load snapshot")
         description: qsTr("Instant use with background sync")
@@ -26,19 +26,22 @@ ColumnLayout {
             height: 26
             CaretRightIcon {
                 anchors.centerIn: parent
-                visible: !snapshotImported
+                visible: !snapshotImportCompleted
                 color: gotoSnapshot.stateColor
             }
             GreenCheckIcon {
                 anchors.centerIn: parent
-                visible: snapshotImported
+                visible: snapshotImportCompleted
                 color: Theme.color.transparent
                 size: 30
             }
         }
         onClicked: root.gotoSnapshot()
     }
-    Separator { Layout.fillWidth: true }
+    Separator {
+        visible: !root.onboarding
+        Layout.fillWidth: true
+    }
     Setting {
         Layout.fillWidth: true
         header: qsTr("Enable listening")

Diff for: src/qml/components/SnapshotSettings.qml

@@ -5,44 +5,28 @@
 import QtQuick 2.15
 import QtQuick.Controls 2.15
 import QtQuick.Layouts 1.15
+import QtQuick.Dialogs 1.3
 
 import "../controls"
 
 ColumnLayout {
-    signal snapshotImportCompleted()
-    property int snapshotVerificationCycles: 0
-    property real snapshotVerificationProgress: 0
-    property bool snapshotVerified: false
-
     id: columnLayout
+    signal back
+    property bool snapshotLoading: nodeModel.snapshotLoading
+    property bool snapshotLoaded: nodeModel.isSnapshotLoaded
+    property bool snapshotImportCompleted: chainModel.isSnapshotActive
+    property bool onboarding: false
+    property bool snapshotVerified: onboarding ? false : chainModel.isSnapshotActive
+    property string snapshotFileName: ""
+    property var snapshotInfo: (snapshotVerified || snapshotLoaded) ? chainModel.getSnapshotInfo() : ({})
+    property string selectedFile: ""
+
     width: Math.min(parent.width, 450)
     anchors.horizontalCenter: parent.horizontalCenter
 
-
-    Timer {
-        id: snapshotSimulationTimer
-        interval: 50 // Update every 50ms
-        running: false
-        repeat: true
-        onTriggered: {
-            if (snapshotVerificationProgress < 1) {
-                snapshotVerificationProgress += 0.01
-            } else {
-                snapshotVerificationCycles++
-                if (snapshotVerificationCycles < 1) {
-                    snapshotVerificationProgress = 0
-                } else {
-                    running = false
-                    snapshotVerified = true
-                    settingsStack.currentIndex = 2
-                }
-            }
-        }
-    }
-
     StackLayout {
         id: settingsStack
-        currentIndex: 0
+        currentIndex: onboarding ? 0 : snapshotLoaded ? 2 : snapshotVerified ? 2 : snapshotLoading ? 1 : 0
 
         ColumnLayout {
             Layout.alignment: Qt.AlignHCenter
@@ -77,11 +61,22 @@ ColumnLayout {
                 Layout.bottomMargin: 20
                 Layout.alignment: Qt.AlignCenter
                 text: qsTr("Choose snapshot file")
-                onClicked: {
-                    settingsStack.currentIndex = 1
-                    snapshotSimulationTimer.start()
+                onClicked: fileDialog.open()
+            }
+
+            FileDialog {
+                id: fileDialog
+                folder: shortcuts.home
+                selectMultiple: false
+                selectExisting: true
+                nameFilters: ["Snapshot files (*.dat)", "All files (*)"]
+                onAccepted: {
+                    selectedFile = fileUrl.toString()
+                    snapshotFileName = selectedFile
+                    nodeModel.snapshotLoadThread(snapshotFileName)
                 }
             }
+            // TODO: Handle file error signal
         }
 
         ColumnLayout {
@@ -102,14 +97,15 @@ ColumnLayout {
                 Layout.leftMargin: 20
                 Layout.rightMargin: 20
                 header: qsTr("Loading Snapshot")
+                description: qsTr("This might take a while...")
             }
 
             ProgressIndicator {
                 id: progressIndicator
                 Layout.topMargin: 20
                 width: 200
                 height: 20
-                progress: snapshotVerificationProgress
+                progress: nodeModel.snapshotProgress
                 Layout.alignment: Qt.AlignCenter
                 progressColor: Theme.color.blue
             }
@@ -137,8 +133,11 @@ ColumnLayout {
                 descriptionColor: Theme.color.neutral6
                 descriptionSize: 17
                 descriptionLineHeight: 1.1
-                description: qsTr("It contains transactions up to January 12, 2024. Newer transactions still need to be downloaded." +
-                " The data will be verified in the background.")
+                description: snapshotInfo && snapshotInfo["date"] ?
+                    qsTr("It contains transactions up to %1. Newer transactions still need to be downloaded." +
+                    " The data will be verified in the background.").arg(snapshotInfo["date"]) :
+                    qsTr("It contains transactions up to DEBUG. Newer transactions still need to be downloaded." +
+                    " The data will be verified in the background.")
             }
 
             ContinueButton {
@@ -147,9 +146,8 @@ ColumnLayout {
                 Layout.alignment: Qt.AlignCenter
                 text: qsTr("Done")
                 onClicked: {
-                    snapshotImportCompleted()
-                    connectionSwipe.decrementCurrentIndex()
-                    connectionSwipe.decrementCurrentIndex()
+                    chainModel.isSnapshotActiveChanged()
+                    back()
                 }
             }
 
@@ -188,14 +186,17 @@ ColumnLayout {
                         font.pixelSize: 14
                     }
                     CoreText {
-                        text: qsTr("200,000")
+                        text: snapshotInfo && snapshotInfo["height"] ?
+                            snapshotInfo["height"] : qsTr("DEBUG")
                         Layout.alignment: Qt.AlignRight
                         font.pixelSize: 14
                     }
                 }
                 Separator { Layout.fillWidth: true }
                 CoreText {
-                    text: qsTr("Hash: 0x1234567890abcdef...")
+                    text: snapshotInfo && snapshotInfo["hashSerialized"] ?
+                        qsTr("Hash: %1").arg(snapshotInfo["hashSerialized"].substring(0, 13) + "...") :
+                        qsTr("Hash: DEBUG")
                     font.pixelSize: 14
                 }
             }

Diff for: src/qml/models/chainmodel.cpp

@@ -9,9 +9,13 @@
 #include <QThread>
 #include <QTime>
 #include <interfaces/chain.h>
+#include <node/utxo_snapshot.h>
+#include <kernel/chainparams.h>
+#include <validation.h>
 
 ChainModel::ChainModel(interfaces::Chain& chain)
     : m_chain{chain}
+    //   m_params{Params()}
 {
     QTimer* timer = new QTimer();
     connect(timer, &QTimer::timeout, this, &ChainModel::setCurrentTimeRatio);
@@ -101,3 +105,22 @@ void ChainModel::setCurrentTimeRatio()
 
     Q_EMIT timeRatioListChanged();
 }
+
+// TODO: Change this once a better solution has been found.
+// Using hardcoded snapshot info to display in SnapshotSettings.qml
+QVariantMap ChainModel::getSnapshotInfo() {
+    QVariantMap snapshot_info;
+
+   const MapAssumeutxo& valid_assumeutxos_map = Params().Assumeutxo();
+    if (!valid_assumeutxos_map.empty()) {
+        const int height = valid_assumeutxos_map.rbegin()->first;
+        const auto& hash_serialized = valid_assumeutxos_map.rbegin()->second.hash_serialized;
+        int64_t date = m_chain.getBlockTime(height);
+
+        snapshot_info["height"] = height;
+        snapshot_info["hashSerialized"] = QString::fromStdString(hash_serialized.ToString());
+        snapshot_info["date"] = QDateTime::fromSecsSinceEpoch(date).toString("MMMM d yyyy");
+    }
+
+    return snapshot_info;
+}

Diff for: src/qml/models/chainmodel.h

@@ -27,6 +27,7 @@ class ChainModel : public QObject
     Q_PROPERTY(quint64 assumedBlockchainSize READ assumedBlockchainSize CONSTANT)
     Q_PROPERTY(quint64 assumedChainstateSize READ assumedChainstateSize CONSTANT)
     Q_PROPERTY(QVariantList timeRatioList READ timeRatioList NOTIFY timeRatioListChanged)
+    Q_PROPERTY(bool isSnapshotActive READ isSnapshotActive NOTIFY isSnapshotActiveChanged)
 
 public:
     explicit ChainModel(interfaces::Chain& chain);
@@ -36,18 +37,21 @@ class ChainModel : public QObject
     quint64 assumedBlockchainSize() const { return m_assumed_blockchain_size; };
     quint64 assumedChainstateSize() const { return m_assumed_chainstate_size; };
     QVariantList timeRatioList() const { return m_time_ratio_list; };
-
+    bool isSnapshotActive() const { return m_chain.hasAssumedValidChain(); };
     int timestampAtMeridian();
 
     void setCurrentTimeRatio();
 
+    Q_INVOKABLE QVariantMap getSnapshotInfo();
+
 public Q_SLOTS:
     void setTimeRatioList(int new_time);
     void setTimeRatioListInitial();
 
 Q_SIGNALS:
     void timeRatioListChanged();
     void currentNetworkNameChanged();
+    void isSnapshotActiveChanged();
 
 private:
     QString m_current_network_name;

Diff for: src/qml/models/nodemodel.cpp

@@ -3,6 +3,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #include <qml/models/nodemodel.h>
+#include <qml/models/snapshotqml.h>
 
 #include <interfaces/node.h>
 #include <net.h>
@@ -14,14 +15,19 @@
 
 #include <QDateTime>
 #include <QMetaObject>
+#include <QObject>
 #include <QTimerEvent>
 #include <QString>
+#include <QUrl>
+#include <QThread>
+#include <QDebug>
 
 NodeModel::NodeModel(interfaces::Node& node)
     : m_node{node}
 {
     ConnectToBlockTipSignal();
     ConnectToNumConnectionsChangedSignal();
+    ConnectToSnapshotLoadProgressSignal();
 }
 
 void NodeModel::setBlockTipHeight(int new_height)
@@ -176,3 +182,44 @@ QString NodeModel::defaultProxyAddress()
 {
     return QString::fromStdString(m_node.defaultProxyAddress());
 }
+
+void NodeModel::ConnectToSnapshotLoadProgressSignal()
+{
+    assert(!m_handler_snapshot_load_progress);
+
+    m_handler_snapshot_load_progress = m_node.handleSnapshotLoadProgress(
+        [this](double progress) {
+            setSnapshotProgress(progress);
+        });
+}
+
+void NodeModel::snapshotLoadThread(QString path_file) {
+    m_snapshot_loading = true;
+    Q_EMIT snapshotLoadingChanged();
+
+    path_file = QUrl(path_file).toLocalFile();
+
+    QThread* snapshot_thread = QThread::create([this, path_file]() {
+        SnapshotQml loader(m_node, path_file);
+        bool result = loader.processPath();
+        if (!result) {
+            m_snapshot_loading = false;
+            Q_EMIT snapshotLoadingChanged();
+        } else {
+            m_snapshot_loaded = true;
+            Q_EMIT snapshotLoaded(result);
+            Q_EMIT snapshotLoadingChanged();
+        }
+    });
+
+    connect(snapshot_thread, &QThread::finished, snapshot_thread, &QThread::deleteLater);
+
+    snapshot_thread->start();
+}
+
+void NodeModel::setSnapshotProgress(double new_progress) {
+    if (new_progress != m_snapshot_progress) {
+        m_snapshot_progress = new_progress;
+        Q_EMIT snapshotProgressChanged();
+    }
+}