From 7d11099e5afd1f16c811ccbe954a158105be36ab Mon Sep 17 00:00:00 2001
From: Daniel Teichmann <daniel.teichmann@das-netzwerkteam.de>
Date: Sat, 18 Jul 2020 16:45:50 +0200
Subject: Add pinChange() function

---
 main.cpp | 33 +++++++++++++++++++++++++++++++++
 main.qml | 10 ++++++++--
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/main.cpp b/main.cpp
index 6889e8d..091f649 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,8 +1,14 @@
 #include <QGuiApplication>
 #include <QQmlApplicationEngine>
+#include <QQmlComponent>
+#include <QQmlProperty>
+#include <QQuickItem>
 #include <QTranslator>
 #include <QDebug>
 
+void changePin(QString pin, QQmlApplicationEngine &engine);
+void gen_random(char *s, const int len);
+
 int main(int argc, char *argv[])
 {
     QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
@@ -25,5 +31,32 @@ int main(int argc, char *argv[])
     if (engine.rootObjects().isEmpty())
         return -1;
 
+    #define PIN_LENGTH 5
+    // The char array in which the random pin will be written to
+    char rand_pin[PIN_LENGTH+1];
+    gen_random(rand_pin, PIN_LENGTH);
+    changePin(rand_pin, engine);
+
     return app.exec();
 }
+
+void changePin(QString pin, QQmlApplicationEngine &engine){
+    QQuickItem *item = engine.rootObjects().at(0)->findChild<QQuickItem*>("pin_text");
+    if (item)
+        item->setProperty("pin", pin);
+}
+
+void gen_random(char *s, const int len) {
+    // Initialize random generator
+    srand( static_cast<unsigned>(time(NULL)));
+
+    static const char alphanum[] =
+        "0123456789"
+        "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+
+    for (int i = 0; i < len; ++i) {
+        s[i] = alphanum[rand() % static_cast<int>(sizeof(alphanum) - 1)];
+    }
+
+    s[len] = 0;
+}
diff --git a/main.qml b/main.qml
index 20a1da6..1e6b242 100644
--- a/main.qml
+++ b/main.qml
@@ -84,8 +84,14 @@ Window {
         id: pin_text
         x: 235
         width: 210
-        height: 50
-        text: qsTr("0 1 A 2 3 B")
+        height: 28
+        // ':' translation info
+        //: Do not translate!
+        //: This is just the pin which is used to authenticate to remote web app (django) frontend
+        text: qsTr("%1").arg(pin)
+        property string pin: "-----"
+        font.letterSpacing: 10
+        anchors.horizontalCenterOffset: 0
         font.pixelSize: 26
         anchors.horizontalCenter: your_pin_text.horizontalCenter
         anchors.top: your_pin_text.bottom
-- 
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