1 files changed, 102 insertions, 0 deletions
diff --git a/sqlitebackend.h b/sqlitebackend.h
new file mode 100644
index 0000000..4dfd2f9
--- /dev/null
+++ b/sqlitebackend.h
@@ -0,0 +1,102 @@
+#ifndef SQLITEBACKEND_H
+#define SQLITEBACKEND_H
+
+#include <QObject>
+#include <QPointF>
+#include <QHash>
+#include <QtSql>
+#include <QFile>
+
+enum TagChange {
+    CREATED,
+    CHANGED,
+    DELETED
+};
+
+class Tag
+{
+public:
+    Tag(long long int id, QString name, qreal anchor_x, qreal anchor_y, QByteArray metadata);
+    Tag();
+    Tag(long long int id, const Tag &other);
+
+    long long int id;
+    QString name;
+    QPointF anchor;
+    QVariantMap metadata;
+};
+
+class SQLiteSaveFile : public QObject
+{
+    Q_OBJECT
+public:
+    explicit SQLiteSaveFile(QObject *parent = nullptr, QString filename = ":memory:");
+    bool connect();
+    bool isOpen() { return m_isOpen; }
+
+    QList<Tag> getAllTags();
+
+    QByteArray getImage();
+
+    bool updateTag(Tag tag);
+    bool deleteTag(Tag tag);
+    bool createTag(Tag tag);
+
+    bool setMeta(const QString &key, const QVariant &value);
+    bool setMeta(std::initializer_list<QPair<QString, QVariant>> metas);
+    QVariant getMeta(const QString &key);
+
+    QString errorString() { return lastErrorString; }
+    enum Error {
+        NoError = 0,
+        SQLiteError,
+        ImageOpenError,
+        ImageReadError
+    };
+    inline const static QString errorNames[] =  {
+                [NoError] = "No Error",
+                [SQLiteError] = "Database Error",
+                [ImageOpenError] = "Error Opening Image",
+                [ImageReadError] = "Error Reading Image"
+            };
+
+    Error error();
+    void resetError() { lastError = NoError; lastErrorString = QString(); }
+
+public slots:
+    /** Save this project file under a new name. This changes the backend database this project file object points to, and copies all data.
+     * Callers can continue to use the same project file object afterwards.
+     */
+    bool saveAs(const QString &filename);
+    bool reloadImageFromDisk();
+    bool loadImageFromDisk(const QString &filename);
+    bool clearNew();
+
+signals:
+    void tagChange(TagChange change, const Tag &tag);
+    void fileReload();
+    void fileIOError(Error e, QString errorName, QString description);
+
+private:
+    bool initDb(bool setCreationDate=true);
+    bool runSql(QString query, std::initializer_list<QVariant> bindings={});
+
+    bool setMetaLocked(const QString &key, const QVariant &value);
+    bool setMetaLocked(std::initializer_list<QPair<QString, QVariant>> metas);
+    QVariant getMetaLocked(const QString &key);
+
+    void setError(Error e, QString desc) { lastError = e; lastErrorString = desc; fileIOError(e, errorNames[e], desc); }
+    bool setDatabaseError(const QSqlQuery &q);
+    bool setDatabaseError(const QSqlDatabase &db);
+
+    Error lastError;
+    QString lastErrorString;
+    QSqlDatabase db;
+    QMutex dbMut;
+    QString filename;
+    QByteArray imageData;
+    bool m_isOpen;
+};
+
+
+#endif // SQLITEBACKEND_H