feat: optimise search in history

src/persistence/history.cpp

@@ -326,7 +326,7 @@ QList<History::DateMessages> History::getChatHistoryCounts(const ToxPk& friendPk
     return counts;
 }
 
-QDateTime History::getStartDateChatHistory(const QString& friendPk)
+QDateTime History::getDateWhereFindPhrase(const QString& friendPk, const QDateTime& from, const QString& phrase)
 {
     QList<QDateTime> counts;
     auto rowCallback = [&counts](const QVector<QVariant>& row) {
@@ -338,8 +338,13 @@ QDateTime History::getStartDateChatHistory(const QString& friendPk)
                 "FROM history "
                 "LEFT JOIN faux_offline_pending ON history.id = faux_offline_pending.id "
                 "JOIN peers chat ON chat_id = chat.id "
-                "WHERE chat.public_key='%1' ORDER BY timestamp ASC LIMIT 1;")
-            .arg(friendPk);
+                "WHERE chat.public_key='%1' "
+                "AND message LIKE '%%2%' "
+                "AND timestamp < '%3' ORDER BY timestamp DESC LIMIT 1;")
+            .arg(friendPk)
+            .arg(phrase)
+            .arg(from.toMSecsSinceEpoch());
+
 
     db->execNow({queryText, rowCallback});
 

src/persistence/history.h

@@ -82,7 +82,7 @@ public:
                                       const QDateTime& to);
 
     QList<DateMessages> getChatHistoryCounts(const ToxPk& friendPk, const QDate& from, const QDate& to);
-    QDateTime getStartDateChatHistory(const QString& friendPk);
+    QDateTime getDateWhereFindPhrase(const QString& friendPk, const QDateTime& from, const QString& phrase);
 
     void markAsSent(qint64 messageId);
 

src/widget/form/chatform.cpp

@@ -502,18 +502,12 @@ void ChatForm::onSearchUp(const QString& phrase)
 
     if (startLine == 0) {
         QString pk = f->getPublicKey().toString();
-        QDateTime startDate = history->getStartDateChatHistory(pk);
+        QDateTime newBaseData = history->getDateWhereFindPhrase(pk, earliestMessage, phrase);
 
-        if (!startDate.isValid() || startDate == earliestMessage) {
+        if (!newBaseData.isValid()) {
             return;
         }
 
-        QDateTime newBaseData = earliestMessage.addDays(-1);
-
-        if (startDate > newBaseData) {
-            newBaseData = startDate;
-        }
-
         searchAfterLoadHistory = true;
         loadHistory(newBaseData);
 
@@ -524,17 +518,12 @@ void ChatForm::onSearchUp(const QString& phrase)
 
     if (!isSearch) {
         QString pk = f->getPublicKey().toString();
-        QDateTime startDate = history->getStartDateChatHistory(pk);
-        QDateTime newBaseData = earliestMessage.addDays(-1);
+        QDateTime newBaseData = history->getDateWhereFindPhrase(pk, earliestMessage, phrase);
 
-        if (!startDate.isValid()) {
+        if (!newBaseData.isValid()) {
             return;
         }
 
-        if (startDate > newBaseData) {
-            newBaseData = startDate;
-        }
-
         searchPoint.setX(numLines);
         searchAfterLoadHistory = true;
         loadHistory(newBaseData);