From 36502ffbafc38c3d818d6bcc9138400e8ca4635b Mon Sep 17 00:00:00 2001
From: Sebastian Brosch <i23009@hb.dhbw-stuttgart.de>
Date: Fri, 1 Nov 2024 13:51:56 +0100
Subject: [PATCH] added solution for phonebook with file save and load

---
 VL03-03-01/main.cc       | 160 +++++++++++++++++++++++++++++++++++++++
 VL03-03-01/phonebook.txt |   6 ++
 2 files changed, 166 insertions(+)
 create mode 100644 VL03-03-01/main.cc
 create mode 100644 VL03-03-01/phonebook.txt

diff --git a/VL03-03-01/main.cc b/VL03-03-01/main.cc
new file mode 100644
index 0000000..74a9b3d
--- /dev/null
+++ b/VL03-03-01/main.cc
@@ -0,0 +1,160 @@
+#include <iostream>
+#include <vector>
+#include <fstream>
+
+typedef struct phonebook_entry {
+  std::string firstname;
+  std::string lastname;
+  std::string phone;
+} phonebook_entry;
+
+int showMenuSelection() {
+  std::cout << std::endl << std::endl;
+  std::cout << "-- Phonebook --" << std::endl;
+  std::cout << "\t 1 - New Entry" << std::endl;
+  std::cout << "\t 2 - Search" << std::endl;
+  std::cout << "\t 3 - Clear" << std::endl;
+  std::cout << "\t 4 - List" << std::endl;
+  std::cout << "\t 9 - Exit" << std::endl;
+  std::cout << std::endl << "Selection: ";
+  int selection;
+  std::cin >> selection;
+  return selection;
+}
+
+void clear(std::vector<phonebook_entry*> &phonebook) {
+  for (phonebook_entry* entry : phonebook) {
+    delete entry;
+  }
+  phonebook.clear();
+  phonebook.shrink_to_fit();
+}
+
+std::vector<phonebook_entry*> getPhonebookFromFile(std::string filename) {
+  std::ifstream file(filename);
+  std::string line;
+  int rownumber = 0;
+  std::vector<phonebook_entry*> phonebook;
+  phonebook_entry* entry;
+
+  if (file.is_open()) {
+    while (file >> line) {
+      switch (rownumber % 3) {
+        case 0:
+          entry = new phonebook_entry;
+          entry->firstname = line;
+          break;
+
+        case 1:
+          entry->lastname = line;
+          break;
+    
+        case 2:
+          entry->phone = line;
+          phonebook.push_back(entry);
+          break;
+      }
+      rownumber++;
+    }
+
+    file.close();
+  } else {
+    std::cout << "Error opening file!" << std::endl;
+  }
+
+  return phonebook;
+}
+
+void listPhonebook(std::vector<phonebook_entry*> &phonebook) {
+  for (phonebook_entry* entry : phonebook) {
+    std::cout << "Firstname: " << entry->firstname << std::endl;
+    std::cout << "Lastname: " << entry->lastname << std::endl;
+    std::cout << "Phone: " << entry->phone << std::endl; 
+    std::cout << std::endl;
+  }
+}
+
+int main() {
+  std::vector<phonebook_entry*> phonebook;
+  phonebook = getPhonebookFromFile("phonebook.txt");
+
+  while (int selection = showMenuSelection()) {
+    phonebook_entry* entry = new phonebook_entry;
+
+    switch (selection) {
+      case 1: {
+        std::cout << "-- New Entry (Phonebook) --" << std::endl;
+        std::cout << "Firstname: ";
+        std::cin >> entry->firstname;
+        std::cout << "Lastname: ";
+        std::cin >> entry->lastname;
+        std::cout << "Phone: ";
+        std::cin >> entry->phone;
+        phonebook.push_back(entry);
+      } break;
+
+      case 2: {
+        std::cout << std::endl << std::endl;
+        std::cout << "-- Search (Phonebook) --" << std::endl;
+        std::cout << "Lastname: ";
+        std::string lastname;
+        std::cin >> lastname;
+  
+        bool found = false;
+    
+        std::cout << std::endl << std::endl;
+        std::cout << "-- Search Result --" << std::endl;
+
+        for (phonebook_entry* entry : phonebook) {
+          if (entry->lastname == lastname) {
+            std::cout << "Lastname: " << entry->firstname << std::endl;
+            std::cout << "Firstname: " << entry->lastname << std::endl;
+            std::cout << "Phone: " << entry->phone << std::endl;
+            found = true;
+          }
+        }
+
+        if (found == false) {
+          std::cout << "No entry found!" << std::endl;
+        }
+      } break;
+
+      case 3: {
+        clear(phonebook);
+      } break;
+
+      case 4: {
+        std::cout << std::endl << std::endl;
+        std::cout << "-- List --" << std::endl;
+        listPhonebook(phonebook);
+      } break;
+
+      case 9: {
+        std::ofstream file("phonebook.txt");
+        
+        if (file.is_open()) {
+          if (phonebook.empty() == false) {
+            for (phonebook_entry* entry : phonebook) {
+              file << entry->firstname << std::endl;
+              file << entry->lastname << std::endl;
+              file << entry->phone << std::endl;
+            }
+          } else {
+            file.clear();
+          }
+          
+          file.close();
+        }
+
+        clear(phonebook);
+        return 0;
+      } break;
+
+      default:
+        std::cout << std::endl << std::endl;
+        std::cout << "Unknown selection. Please try again!";
+    }
+  }
+
+  return 0;
+}
\ No newline at end of file
diff --git a/VL03-03-01/phonebook.txt b/VL03-03-01/phonebook.txt
new file mode 100644
index 0000000..1851605
--- /dev/null
+++ b/VL03-03-01/phonebook.txt
@@ -0,0 +1,6 @@
+Mary
+Johnson
+714-895-2324
+Christopher
+Smith
+205-448-1563