commit c46805e77bdb49f62044cff883789a478754a20c
Author: Flinner Yuu <flinner@nand.sh>
Date:   Wed Dec 4 11:51:16 2024 +0300

    feat: init

diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..b4c72df
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,24 @@
+# Minimum required version of CMake
+cmake_minimum_required(VERSION 3.10)
+
+# Project name
+project(ClinicProject)
+
+# Set the C++ standard
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+# Add the executable target for the project
+add_executable(ClinicApp
+    main.cpp
+    Clinic.cpp
+    Patient.cpp
+    Visit.cpp
+
+)
+
+# Include directories if necessary (e.g., for .hpp files)
+include_directories(${CMAKE_SOURCE_DIR})
+
+# If you have any custom configurations or testing requirements,
+# you can define them here, such as linking libraries or adding flags.
diff --git a/Clinic.cpp b/Clinic.cpp
new file mode 100644
index 0000000..a270e6d
--- /dev/null
+++ b/Clinic.cpp
@@ -0,0 +1,172 @@
+#include "Patient.hpp"
+#include <algorithm>
+#include <fstream>
+#include <functional>
+#include <iostream>
+#include <optional>
+#include <sstream>
+#include <sys/types.h>
+
+#ifndef CLINIC_
+#define CLINIC_
+
+enum class MenuChoice {
+  NewPatient = 1,
+  NewVisit = 2,
+  DisplayPatient = 3,
+  Quit = 4,
+};
+
+struct Clinic {
+public:
+  std::vector<Patient> patients;
+  std::string filename;
+
+private:
+  // C++ types are getting crazy here :( I really miss Rust
+  // `std::optional` needed because a patient might not be found
+  // `std::reference_wrapper` because `std::optional` deoesn't accept references
+  // I want to reference because (I want to save cpu cycles from memory copies)
+  std::optional<std::reference_wrapper<Patient>>
+  find_patient(u_int32_t patient_id) {
+    auto it = std::find_if(patients.begin(), patients.end(),
+                           [&id = patient_id](const Patient &p) -> bool {
+                             return p.get_id() == id;
+                           });
+    if (it != patients.end())
+      return *it;
+    return std::nullopt;
+  };
+
+public:
+  Clinic(std::string filename) : filename(filename) {
+    ///  this file contains a list of patient IDs.
+    // 1
+    // 2
+    // 4  (could be non-sequential
+    //     but always sorted!)
+    u_int32_t patient_id;
+    std::ifstream file{filename};
+    if (!file.is_open()) {
+      std::cerr << "File " << filename << " couldn't be opened :(\n";
+      exit(1);
+    }
+
+    while (file >> patient_id)
+      patients.push_back(Patient(patient_id));
+  }
+
+  // writes the patients.txt file containing patient IDs.
+  void write_file() {
+    std::ofstream file{filename};
+    for (auto p : patients)
+      file << p.get_id() << "\n";
+  }
+  u_int32_t generate_id() {
+    u_int32_t id{};
+    // O(n), could be improved by using UUIDs, or store max_id in Clinic
+    for (auto p : patients)
+      id = std::max(id, p.get_id());
+    id++;
+    return id;
+  }
+
+  MenuChoice menu_main() {
+    int choice{};
+    std::cout << "==============================================\n";
+    std::cout << "Please choose a command:\n";
+    std::cout << "1. add new patient\n";
+    std::cout << "2. add new visit\n";
+    std::cout << "3. display patient information\n";
+    std::cout << "4. quit\n";
+    std::cout << ">> ";
+
+    std::cin >> choice;
+
+    while (choice < int(MenuChoice::NewPatient) ||
+           choice > int(MenuChoice::Quit)) {
+      std::cout << "Invalid input! Try again :)\n";
+      std::cout << "Please choose a command:\n";
+      std::cout << "1. add new patient\n";
+      std::cout << "2. add new visit\n";
+      std::cout << "3. display patient information\n";
+      std::cout << "4. quit\n";
+      std::cout << ">> ";
+      std::cin >> choice;
+    }
+    return static_cast<MenuChoice>(choice);
+  }
+
+  void menu_patient_info() {
+    int patient_id;
+    std::cout << "Patient file number: ";
+    std::cin >> patient_id;
+    auto patient = find_patient(patient_id);
+    if (patient.has_value())
+      std::cout << patient.value();
+    else
+      std::cout << "No Patient exists with id= " << patient_id << "\n";
+    std::cout << "--------------------\n\n";
+  }
+
+  void menu_add_new_patient() {
+    std::string reading_string;
+    std::string input_string;
+    Patient patient{};
+    std::stringstream patient_stream;
+
+    // not the most optimal way, but the lazy way
+    // see: https://ammar.engineer/posts/2023/06/03/laziness/
+    // this "emulates" a file so that I can resuse my >> operator
+    reading_string += std::to_string(generate_id()) + "\n";
+    std::cout << "Generate " << reading_string;
+    std::cout << "First name (no spaces): ";
+    std::cin >> input_string;
+    reading_string += input_string + "\n";
+    std::cout << "Last name (no spaces): ";
+    std::cin >> input_string;
+    reading_string += input_string + "\n";
+    std::cout << "Gender (M or F): ";
+    std::cin >> input_string;
+    reading_string += input_string + "\n";
+    std::cout << "Age: ";
+    std::cin >> input_string;
+    reading_string += input_string + "\n";
+    std::cout << reading_string;
+    patient_stream = std::stringstream(reading_string);
+
+    // all of that just for this moment:
+    patient_stream >> patient;
+    patients.push_back(patient); // save in memory
+    patient.write_patient();     // write to file
+    write_file();
+  }
+  void menu_add_vist() {
+    std::string reading_string;
+    std::string input_string;
+    int patient_id;
+
+    std::cout << "Patient file number: ";
+    std::cin >> patient_id;
+    std::cout << "Date:";
+    std::cin >> input_string;
+    reading_string += input_string + " ";
+    std::cout << "Doctor's First Name: ";
+    std::cin >> input_string;
+    reading_string += input_string + " ";
+    std::cout << "Doctors's Last Name: ";
+    std::cin >> input_string;
+    reading_string += input_string + " ";
+
+    std::stringstream visit_stream = std::stringstream(reading_string);
+    Visit visit;
+    visit_stream >> visit;
+    auto patient = find_patient(patient_id);
+    if (patient.has_value())
+      patient.value().get().add_visit(visit);
+    else
+      std::cout << "No Patient exists with id= " << patient_id << "\n";
+  }
+};
+
+#endif
diff --git a/Patient.cpp b/Patient.cpp
new file mode 100644
index 0000000..5ae863a
--- /dev/null
+++ b/Patient.cpp
@@ -0,0 +1,111 @@
+// The class Patient stores the personal information of a patient as well as
+// his/her history of medical visits as a vector of Visit objects, all as
+// private data members. The class interface allows user code to:
+
+// - Instantiate a Patient object given (as parameters) all his/her
+//   personal information. No visit history is required. The same
+//   function should also create a patient record file according to
+//   the format specified above.
+
+// - Instantiate a Patient object given (as parameter) his/her ID
+//   number. The personal information as well as the visit history of
+//   the patients to be read from his existing record file.
+
+// - Add one Visit record given a Visit object as parameter. The same
+//   function should record the Visit in the patient file.
+
+// - Print the patient record according to the format specified in
+//   the files above using the << operator (including history)
+
+#include "Patient.hpp"
+#include "Visit.hpp"
+#include <fstream>
+#include <iostream>
+#include <istream>
+#include <ostream>
+#include <sstream>
+#include <string>
+#include <sys/types.h>
+#include <vector>
+
+////////////////////////////////////
+// File: patient_files/3.txt      //
+// 3                              //
+// Amirah                         //
+// Asaad                          //
+// F                              //
+// 26                             //
+// 3 1/1/2018 Abdullah Alshareef  //
+// 9 4/1/2018 Helen Philips       //
+// 14 8/1/2018 Abdullah Alshareef //
+////////////////////////////////////
+
+Patient::Patient(u_int32_t id) : id(id) {
+  auto patient_file_path = "patient_files/" + std::to_string(id) + ".txt";
+  std::ifstream patient_file{patient_file_path};
+  if (patient_file.is_open()) {
+    patient_file >> *this;
+  } else {
+    std::cerr << "Failed to read patient file at: " + patient_file_path;
+    exit(1);
+  }
+}
+
+void Patient::write_patient() {
+  // create patient's file
+  // this will overwrite any patient with the same id
+  auto patient_file_path = "patient_files/" + std::to_string(id) + ".txt";
+  std::ofstream patient_file{patient_file_path};
+  if (patient_file.is_open()) {
+    patient_file << *this;
+  } else {
+    std::cerr << "Failed to create patient file at: " + patient_file_path;
+    exit(1);
+  }
+}
+
+u_int32_t Patient::get_id() const { return id; }
+
+void Patient::add_visit(Visit const &visit) {
+  visits.push_back(visit);
+  // could have logic to append data and not re-write the whole thing, but not
+  // worth it
+  // this rewrites the entire file each time a visits gets added
+  write_patient();
+}
+
+std::ostream &operator<<(std::ostream &out, Patient &patient) {
+  // clang-format off
+    out << patient.id                                     << "\n";
+    out << patient.first_name << "\n"<< patient.last_name << "\n";
+    out << patient.gender_char()                          << "\n";
+    out << patient.age                                    << "\n";
+    for (auto visit : patient.visits)
+      out << visit << "\n";
+    return out;
+  // clang-format on
+}
+std::istream &operator>>(std::istream &in, Patient &patient) {
+  char gender_char{};
+  in >> patient.id;
+  in >> patient.first_name >> patient.last_name;
+  in >> gender_char;
+  in >> patient.age;
+
+  patient.gender = gender_char == 'M' ? true : false;
+
+  std::string visit_string;
+  Visit visit{};
+
+  // read to string, convert to string stream, read from that stream again
+  // weird C++ gymnastics (or bad design by me)
+  getline(in, visit_string); // first string is always empty for some reason
+  while (getline(in, visit_string)) {
+    std::stringstream visit_stream(visit_string);
+    visit_stream >> visit;
+    patient.visits.push_back(visit);
+  }
+
+  return in;
+  // clang-format on
+}
diff --git a/Patient.hpp b/Patient.hpp
new file mode 100644
index 0000000..3708b95
--- /dev/null
+++ b/Patient.hpp
@@ -0,0 +1,53 @@
+#ifndef PATIENT_HPP
+#define PATIENT_HPP
+
+#include "Visit.hpp"
+#include <iostream>
+#include <istream>
+#include <ostream>
+#include <string>
+#include <sys/types.h>
+#include <vector>
+
+////////////////////////////////////
+// File: patient_files/3.txt      //
+// 3                              //
+// Amirah                         //
+// Asaad                          //
+// F                              //
+// 26                             //
+// 3 1/1/2018 Abdullah Alshareef  //
+// 9 4/1/2018 Helen Philips       //
+// 14 8/1/2018 Abdullah Alshareef //
+////////////////////////////////////
+
+class Patient {
+private:
+  // clang-format off
+  u_int32_t          id;
+  std::string        first_name;
+  std::string        last_name;
+  bool               gender; // true gender = M, false gender = F
+  u_int32_t          age;
+  std::vector<Visit> visits;
+
+  char gender_char() { return gender ? 'M' : 'F'; }
+
+public:
+  void write_patient();
+  Patient(){};
+  Patient(u_int32_t id, std::string first_name, std::string last_name,    bool gender, u_int age)
+               : id(id), first_name(first_name),  last_name(last_name), gender(gender),  age(age) {
+    // clang-format on
+    write_patient();
+  }
+  Patient(u_int32_t id);
+  u_int32_t get_id() const;
+
+public:
+  void add_visit(Visit const &visit);
+  friend std::ostream &operator<<(std::ostream &out, Patient &patient);
+  friend std::istream &operator>>(std::istream &in, Patient &patient);
+};
+
+#endif
diff --git a/Visit.cpp b/Visit.cpp
new file mode 100644
index 0000000..0f7bdca
--- /dev/null
+++ b/Visit.cpp
@@ -0,0 +1,23 @@
+#include <iostream>
+#include <istream>
+#include <ostream>
+#include <sys/types.h>
+
+#include "Visit.hpp"
+
+std::istream &operator>>(std::istream &in, Visit &visit) {
+  in >> visit.visit_id;
+  in >> visit.date;
+  in >> visit.doctor_first_name;
+  in >> visit.doctor_last_name;
+  return in;
+}
+
+std::ostream &operator<<(std::ostream &out, Visit &visit) {
+  auto v = visit;
+  out << v.visit_id << " "          //
+      << v.date << " "              //
+      << v.doctor_first_name << " " //
+      << v.doctor_last_name;
+  return out;
+}
diff --git a/Visit.hpp b/Visit.hpp
new file mode 100644
index 0000000..531615a
--- /dev/null
+++ b/Visit.hpp
@@ -0,0 +1,35 @@
+#ifndef VISIT_HPP
+#define VISIT_HPP
+
+#include <iostream>
+#include <istream>
+#include <ostream>
+#include <string>
+#include <sys/types.h>
+
+class Visit {
+  // clang-format off
+private:
+  u_int32_t          visit_id{};
+  u_int32_t          patient_id{};//.txt
+  std::string        date{}; //"dd/mm/yyyy"
+  std::string        doctor_first_name{};
+  std::string        doctor_last_name{};
+
+  // clang-format on
+public:
+  Visit() {}
+  Visit(u_int32_t visit_id, u_int32_t patient_id, std::string date,
+        std::string doctor_first_name, std::string doctor_last_name)
+      : visit_id(visit_id), patient_id(patient_id), date(date),
+        doctor_first_name(doctor_first_name),
+        doctor_last_name(doctor_last_name) {}
+  // clang-format off
+  // clang-format on
+
+  friend std::istream &operator>>(std::istream &in, Visit &visit);
+
+  friend std::ostream &operator<<(std::ostream &out, Visit &visit);
+};
+
+#endif
diff --git a/linkedList.cpp b/linkedList.cpp
new file mode 100644
index 0000000..2829d12
--- /dev/null
+++ b/linkedList.cpp
@@ -0,0 +1,201 @@
+#include <cstddef>
+#include <iostream>
+#ifndef LINKED_LIST
+#define LINKED_LIST
+
+using namespace std;
+
+struct node {
+  int data;
+  node *next;
+  node *previous;
+};
+
+class List {
+  // private:
+public:
+  node *head{};
+  node *tail{};
+
+public:
+  // A default constructor, which creates an empty list
+  List() {}
+  // Not specified in the HW, but needed in my opinion
+  List(node *head, node *tail) : head(head), tail(tail) {}
+  // A parametrized constructor, which creates a list out of the elements of an
+  // array, keeping them in the same given order.
+  List(char *data, size_t n) {
+    for (int i{0}; i < n; i++)
+      appendList(data[i]);
+  }
+  // A copy constructor.
+  List(List const &list) {
+    auto h = list.head;
+    while (h != list.tail->next) {
+      appendList(h->data);
+      h = h->next;
+    }
+  }
+
+  bool isEmptyList();
+  std::ostream &printList(std::ostream &out);
+  void prependList(int);
+  void appendList(int);
+  bool findInList(int);
+  void pop();
+  void popBack();
+  void removeFromList(node *);
+  void removeFromList(int);
+
+  friend List operator+(int const a, List const list) {
+    // copy
+    List newlist(list);
+    newlist.prependList(a);
+    return newlist;
+  }
+  friend List operator+(List const list, int a) {
+    // copy
+    List newlist(list);
+    newlist.appendList(a);
+    return newlist;
+  }
+  friend List operator+(List const list1, List const list2) {
+    // copies
+    List newlist1(list1);
+    node *h = list2.head;
+    while (h != list2.tail->next) {
+      newlist1.appendList(h->data);
+      h = h->next;
+    }
+
+    return newlist1;
+  }
+
+  node operator[](int i) {
+    auto h = head;
+    for (int j{0}; j < i; j++)
+      h = h->next;
+    return *h;
+  }
+};
+std::ostream &operator<<(std::ostream &out, List list) {
+  return list.printList(out);
+}
+
+bool List::isEmptyList() {
+  if (head == nullptr && tail == nullptr)
+    return true;
+  return false;
+}
+void List::appendList(int data) {
+  node *node1 = new node{data, nullptr, tail};
+  if (head == nullptr && tail == nullptr) {
+    head = node1;
+    tail = node1;
+  } else {
+    tail->next = node1;
+    tail = node1;
+  }
+}
+
+std::ostream &List::printList(std::ostream &out) {
+  if (isEmptyList()) {
+    out << "List is empty" << endl;
+    return out;
+  }
+  node *traveller = head;
+  while (traveller != tail) {
+    out << traveller->data << "=>";
+    traveller = traveller->next;
+  }
+  out << tail->data << endl;
+  return out;
+}
+
+void List::prependList(int data) {
+  node *node1 = new node{data, head, nullptr};
+  if (head == nullptr && tail == nullptr) {
+    head = node1;
+    tail = node1;
+  } else {
+    head->previous = node1;
+    head = node1;
+  }
+}
+
+bool List::findInList(int key) {
+  // returns a pointer to the first occurrence of the key in the list
+  node *traveller = head;
+  while (traveller != tail->next) {
+    if (traveller->data == key) {
+      // return traveller;
+      return true;
+    }
+    traveller = traveller->next;
+  }
+  return false;
+}
+void List::pop() {
+  if (isEmptyList())
+    return;
+  if (head == tail) // one node
+  {
+    delete head;
+    head = nullptr;
+    tail = nullptr;
+    return;
+  }
+  node *firstNode = head;
+  head = head->next;
+  head->previous = nullptr;
+  delete firstNode;
+}
+
+void List::popBack() {
+  if (isEmptyList())
+    return;
+  if (head == tail) // one node
+  {
+    delete head;
+    head = nullptr;
+    tail = nullptr;
+    return;
+  }
+  node *lastNode = tail;
+  tail = tail->previous;
+  tail->next = nullptr;
+  delete lastNode;
+}
+
+void List::removeFromList(node *node1) {
+  if (node1 == head) {
+    pop();
+    return;
+  }
+  if (node1 == tail) {
+    popBack();
+    return;
+  }
+  if (node1) {
+    node *tempPrev = node1->previous;
+    node *tempNext = node1->next;
+    tempPrev->next = tempNext;
+    tempNext->previous = tempPrev;
+    delete node1;
+  }
+}
+
+void List::removeFromList(int key) {
+  node *traveller = head;
+  while (traveller != tail->next) {
+    if (traveller->data == key) {
+      removeFromList(traveller);
+      return;
+    }
+    traveller = traveller->next;
+  }
+
+  // note that this deletes only the first occurrence of the key in the list
+}
+
+#endif
diff --git a/main.cpp b/main.cpp
new file mode 100644
index 0000000..46451bf
--- /dev/null
+++ b/main.cpp
@@ -0,0 +1,73 @@
+#include "Clinic.cpp"
+#include "Patient.hpp"
+#include "linkedList.cpp"
+#include <algorithm>
+#include <fstream>
+#include <functional>
+#include <iostream>
+#include <optional>
+#include <sstream>
+#include <sys/types.h>
+
+int main() {
+  // this program implements the sieve of Erathosthenes using linked lists
+  // it does not use/test all the list functions
+  List primes{nullptr, nullptr};
+  for (int i = 2; i <= 20; i++) {
+    primes.appendList(i);
+  }
+  node *p = primes.head;
+  while (p != primes.tail) {
+    int prime = p->data;
+    int tailData = primes.tail->data;
+    for (int composite = 2 * prime; composite <= tailData; composite += prime) {
+      primes.removeFromList(
+          composite); // if the composite is not in the list, nothing happens
+    }
+    p = p->next;
+  }
+  std::cout << primes;
+
+  // testing copy
+  List primes_copy(primes);
+  std::cout << "primes: " << primes;
+  std::cout << "primes: " << primes_copy + 1;
+  std::cout << "primes+primes: " << primes_copy + primes_copy;
+
+  // should return 5
+  std::cout << "primes[2] = ";
+  std::cout << primes_copy[2].data << std::endl;
+
+  return 0;
+}
+
+// int main() {
+//   Clinic clinic("patients.txt");
+//   std::cout << "Welcome to patient management\n\n";
+
+//   // run util main_menu recieves a non-exit value
+//   MenuChoice choice;
+//   Patient patient{};
+//   std::string reading_string;
+//   std::string input_string;
+
+//   while (1) {
+//     choice = clinic.menu_main();
+//     switch (choice) {
+//     case MenuChoice::NewPatient:
+//       clinic.menu_add_new_patient();
+//       break;
+//     case MenuChoice::NewVisit:
+//       clinic.menu_add_vist();
+//       break;
+//     case MenuChoice::DisplayPatient:
+//       clinic.menu_patient_info();
+//       break;
+//     case MenuChoice::Quit:
+//       return 0;
+//       break;
+//     }
+//   }
+
+//   return 0;
+// }
diff --git a/patient_files/1.txt b/patient_files/1.txt
new file mode 100644
index 0000000..4b8790c
--- /dev/null
+++ b/patient_files/1.txt
@@ -0,0 +1,9 @@
+1
+Joe
+Doe
+M
+18
+1 11/12/103 Mike WWW
+1 11/12/103 Mike WWW
+1 11/12/103 Mike WWW
+77 /88/9999 Doctr Last
diff --git a/patient_files/6.txt b/patient_files/6.txt
new file mode 100644
index 0000000..5bcc488
--- /dev/null
+++ b/patient_files/6.txt
@@ -0,0 +1,6 @@
+6
+Karim
+Alaswad
+M
+14
+16 12/1/2018 Helen Philips
diff --git a/patients.txt b/patients.txt
new file mode 100644
index 0000000..9364ec4
--- /dev/null
+++ b/patients.txt
@@ -0,0 +1,3 @@
+1
+3
+4