Add undo/redo commands for importing dive sites

ImportDiveSites adds the provided dive sites to the core dive site table
and stores the source data so it can be undone.

Signed-off-by: Doug Junkins <junkins@foghead.com>

desktop-widgets/command.cpp

@@ -120,6 +120,11 @@ void addDiveSite(const QString &name)
 	execute(new AddDiveSite(name));
 }
 
+void importDiveSites(struct dive_site_table *sites, const QString &source)
+{
+	execute(new ImportDiveSites(sites, source));
+}
+
 void mergeDiveSites(dive_site *ds, const QVector<dive_site *> &sites)
 {
 	execute(new MergeDiveSites(ds, sites));

desktop-widgets/command.h

@@ -48,6 +48,7 @@ void editDiveSiteCountry(dive_site *ds, const QString &value);
 void editDiveSiteLocation(dive_site *ds, location_t value);
 void editDiveSiteTaxonomy(dive_site *ds, taxonomy_data &value); // value is consumed (i.e. will be erased after call)!
 void addDiveSite(const QString &name);
+void importDiveSites(struct dive_site_table *sites, const QString &source);
 void mergeDiveSites(dive_site *ds, const QVector<dive_site *> &sites);
 void purgeUnusedDiveSites();
 

desktop-widgets/command_divesite.cpp

@@ -100,6 +100,42 @@ void AddDiveSite::undo()
 	sitesToAdd = std::move(removeDiveSites(sitesToRemove));
 }
 
+ImportDiveSites::ImportDiveSites(struct dive_site_table *sites, const QString &source)
+{
+	setText(tr("import dive sites from %1").arg(source));
+
+	for (int i = 0; i < sites->nr; ++i) {
+		struct dive_site *new_ds = sites->dive_sites[i];
+
+		// Don't import dive sites that already exist. Currently we only check for
+		// the same name. We might want to be smarter here and merge dive site data, etc.
+		struct dive_site *old_ds = get_same_dive_site(new_ds);
+		if (old_ds) {
+			free_dive_site(new_ds);
+			continue;
+		}
+		sitesToAdd.emplace_back(new_ds);
+	}
+
+	// All site have been consumed
+	sites->nr = 0;
+}
+
+bool ImportDiveSites::workToBeDone()
+{
+	return !sitesToAdd.empty();
+}
+
+void ImportDiveSites::redo()
+{
+	sitesToRemove = std::move(addDiveSites(sitesToAdd));
+}
+
+void ImportDiveSites::undo()
+{
+	sitesToAdd = std::move(removeDiveSites(sitesToRemove));
+}
+
 DeleteDiveSites::DeleteDiveSites(const QVector<dive_site *> &sites) : sitesToRemove(sites.toStdVector())
 {
 	setText(tr("delete %n dive site(s)", "", sites.size()));

desktop-widgets/command_divesite.h

@@ -21,10 +21,26 @@ private:
 
 	// Note: we only add one dive site. Nevertheless, we use vectors so that we
 	// can reuse the dive site deletion code.
-	// For redo
+	// For undo
 	std::vector<dive_site *> sitesToRemove;
 
+	// For redo
+	std::vector<OwningDiveSitePtr> sitesToAdd;
+};
+
+class ImportDiveSites : public Base {
+public:
+	// Note: the dive site table is consumed after the call it will be empty.
+	ImportDiveSites(struct dive_site_table *sites, const QString &source);
+private:
+	bool workToBeDone() override;
+	void undo() override;
+	void redo() override;
+
 	// For undo
+	std::vector<dive_site *> sitesToRemove;
+
+	// For redo
 	std::vector<OwningDiveSitePtr> sitesToAdd;
 };