Resend Data capabilities

Closes #29 (closed)

host/host_central_mast/lib/ResendManager/ResendManager.cpp

+//
+// Created by cynthya on 1/5/23.
+//
+
+#include "ResendManager.h"
+#include "Utilities.h"
+
+void ResendManager::init() {
+    createResendDirectory();
+    // log
+    uint lastResendFileId = getLastResendFileId();
+    nextResendFileId = lastResendFileId + 1;
+    esp_log_write(ESP_LOG_INFO, "ResendManager", "nextResendFileId: %d\n", nextResendFileId);
+}
+
+uint ResendManager::getLastResendFileId() const { // get the next file id to be resend
+    auto filesInDirectory = getFilesInDirectory(resendDirectoryPath);
+    // convert the file names to uint
+    std::list<uint> fileUintIDs;
+
+    try {
+        for (const auto &fileName : filesInDirectory) {
+            fileUintIDs.emplace_back(std::stoul(fileName.c_str()));
+        }
+    } catch (std::invalid_argument &e) {
+        esp_log_write(ESP_LOG_ERROR, "getLastResendFileId", "Failed to convert file name to uint\n");
+        throw;
+    }
+    // get the max
+    uint max = 0;
+    for (const auto &fileID : fileUintIDs) {
+        if (fileID > max) {
+            max = fileID;
+        }
+    }
+
+    return max;
+}
+
+void ResendManager::createResendDirectory() const { // create directory if it doesn't exist
+    createDirectory("/resend");
+}
+
+void ResendManager::storeForResend(const String &messageToBeSend) {
+    // create file
+    String filename = String(nextResendFileId);
+    writeFile(messageToBeSend, resendDirectoryPath + "/" + filename);
+    ResendManager::incrementCount();
+}
+
+std::optional<ResendPointType> ResendManager::loadNextToBeResendMessage() {
+    // get first file in resend directory
+    auto filename = getFirstFileNameInDirectory(resendDirectoryPath.c_str());
+
+    if (filename.has_value()) {
+
+        // read file
+        auto message = readFile(resendDirectoryPath + "/" + filename.value().c_str());
+        return ResendPointType{message, filename.value()};
+    }
+    return std::nullopt;
+}
+
+void ResendManager::deleteResendMessage(const String &filename) {
+    auto filePath = resendDirectoryPath + "/" + filename;
+    if (SD.remove(filePath.c_str())) {
+        esp_log_write(ESP_LOG_INFO, "ResendManager", "Deleted file: %s\n", filePath.c_str());
+    } else {
+        esp_log_write(ESP_LOG_ERROR, "ResendManager", "Failed to delete file: %s\n", filePath.c_str());
+        throw;
+    }
+}