Add calendar Parsing

NewDisplayDriver/esphub/esphub.ino

@@ -58,6 +58,7 @@ SPIClass hspi(HSPI);
 Config conf;
 ActiveFeatures activeFeatures;
 int loopIteration = 0;
+std::vector<Calendar> cals; // Contains Calendar data
 
 void setup()
 {
@@ -123,11 +124,7 @@ void setup()
     activeFeatures.weather = false;
   }
   text_y += line_height;
-  // Check Nextcloud reachable here
-    // Nextcloud dev check:
-    StartEnd timestamp = calculateStartEnd();
-    String cal_test = downloadICSFile(conf.calUrls[0], String(timestamp.start), String(timestamp.end), conf.calUser, conf.calKey);
-    Serial.println(cal_test);
+  activeFeatures.calendar = true;
   displayActiveFeatures(activeFeatures);
   bootMsg("Weather Icons sourced from flaticon.com", text_y);
   text_y += 2 * line_height;
@@ -156,7 +153,12 @@ void loop() {
 
     // Fetch calendar data if it is active
     if (activeFeatures.calendar) {
-      // FETCH CALENDAR DATA HERE
+      StartEnd se = calculateStartEnd();
+      cals = std::vector<Calendar>(); // Clear the vector
+      for (const String& url : conf.calUrls) {
+        Calendar cal = downloadICSFile(url, String(se.start), String(se.end), conf.calUser, conf.calKey);
+        cals.push_back(cal);
+      }
     }
 
     Serial.printf("Loop iteration %d\n", loopIteration);
@@ -169,8 +171,8 @@ void loop() {
       if (activeFeatures.weather && weather.latitude != 0 && weather.longitude != 0) {
         displayWeather(weather);
       }
-      if (!activeFeatures.calendar) { // Temporarily inverse the statenment during tests
-        displayCalendar(timeinfo);
+      if (activeFeatures.calendar) { // Temporarily inverse the statenment during tests
+        displayCalendar(timeinfo, cals);
       }
     } while (display.nextPage());
   }
@@ -458,7 +460,7 @@ void displayFullScreenArt() {
   while (display.nextPage());
 }
 
-void displayCalendar(struct tm timeinfo) {
+void displayCalendar(struct tm timeinfo, std::vector<Calendar> cals) {
   const int cal_y = 80;
   const int cal_head = 30;
   const int cal_margin = 30;
@@ -489,4 +491,26 @@ void displayCalendar(struct tm timeinfo) {
     display.setCursor(3, cal_head + i * 74 + 96);
     display.print(weekDays[dayOfWk]);
   }
+
+  // Print Calendar Data
+  if (!cals.empty()) {
+    Calendar firstCal = cals[0];
+
+    int eventCount = 0;
+    int cursorY = 150;
+    int cursorX = 50;
+    for (const VEvent& event : firstCal.events) {
+      if (eventCount >= 2) break;
+      display.setCursor(cursorX, cursorY);
+      display.print(event.dtstamp);
+      display.setCursor(cursorX, cursorY + 20);
+      display.print(event.dtstart);
+      display.setCursor(cursorX, cursorY + 40);
+      display.print(event.dtend);
+      display.setCursor(cursorX, cursorY + 60);
+      display.print(event.summary);
+      eventCount++;
+      cursorX = cursorX + 300;
+    }
+  }
 }

NewDisplayDriver/esphub/nextcloud_cal.cpp

@@ -6,7 +6,7 @@
 #include "nextcloud_cal.h"
 #include "tls_certificates.h"
 
-String downloadICSFile(const String& url, const String& startTime, const String& endTime, const String& username, const String& password) {
+Calendar downloadICSFile(const String& url, const String& startTime, const String& endTime, const String& username, const String& password) {
     WiFiClientSecure client;
     client.setCACert(letsencrypt_root_ca);
 
@@ -24,7 +24,7 @@ String downloadICSFile(const String& url, const String& startTime, const String&
         Serial.println("Connection failed!");
         Serial.print("Host: ");
         Serial.println(host);
-        return "";
+        return Calendar{};
     }
 
     // Encode credentials in Base64
@@ -54,10 +54,10 @@ String downloadICSFile(const String& url, const String& startTime, const String&
         if (headerEnd != -1) {
             response = response.substring(headerEnd + 4);
         }
-        return response;
+        return parseVCalendar(response);
     } else {
         Serial.println("Failed to fetch: " + String(statusCode));
-        return "";
+        return Calendar{};
     }
 }
 
@@ -85,3 +85,44 @@ StartEnd calculateStartEnd() {
     StartEnd result = {startTimestamp, endTimestamp};
     return result;
 }
+
+Calendar parseVCalendar(String vcalData) {
+  Calendar calendar;
+  VEvent currentEvent;
+  bool inEvent = false;
+
+  int startPos = 0;
+  while (startPos < vcalData.length()) {
+    int endPos = vcalData.indexOf("\n", startPos);
+    if (endPos == -1) endPos = vcalData.length();
+
+    String line = vcalData.substring(startPos, endPos);
+    line.trim();
+
+    if (line.startsWith("X-WR-CALNAME:")) {
+      calendar.name = line.substring(13);
+    } else if (line.startsWith("X-APPLE-CALENDAR-COLOR:")) {
+      calendar.color = line.substring(25);
+    } else if (line.startsWith("BEGIN:VEVENT")) {
+      inEvent = true;
+      currentEvent = VEvent();
+    } else if (line.startsWith("END:VEVENT")) {
+      inEvent = false;
+      calendar.events.push_back(currentEvent);
+    } else if (inEvent) {
+      if (line.startsWith("DTSTAMP:")) {
+        currentEvent.dtstamp = line.substring(8);
+      } else if (line.startsWith("DTSTART:")) {
+        currentEvent.dtstart = line.substring(8);
+      } else if (line.startsWith("DTEND:")) {
+        currentEvent.dtend = line.substring(6);
+      } else if (line.startsWith("SUMMARY:")) {
+        currentEvent.summary = line.substring(8);
+      }
+    }
+
+    startPos = endPos + 1;
+  }
+
+  return calendar;
+}

NewDisplayDriver/esphub/nextcloud_cal.h

@@ -9,7 +9,22 @@ struct StartEnd {
     time_t end;
 };
 
+struct VEvent {
+  String dtstamp;
+  String dtstart;
+  String dtend;
+  String summary;
+};
+
+struct Calendar {
+  String name;
+  String color;
+  std::vector<VEvent> events;
+};
+
 struct StartEnd calculateStartEnd();
-String downloadICSFile(const String& url, const String& startTime, const String& endTime, const String& username, const String& password);
+Calendar downloadICSFile(const String& url, const String& startTime, const String& endTime, const String& username, const String& password);
+
+Calendar parseVCalendar(String vcalData);
 
 #endif