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Task 3 #8

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108c168
Added the filterSuppliers method which uses Supplier.filterSuppliers …
CyrilAshong Aug 8, 2025
56db8da
Add supplier filtering and management to PharmacySystem
CyrilAshong Aug 8, 2025
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244 changes: 177 additions & 67 deletions Pharmacy Inventory Management/src/PharmacySystem.java
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Original file line number Diff line number Diff line change
@@ -1,24 +1,28 @@
import java.io.*;
import java.util.*;
import java.util.stream.Collectors;

// Enhanced system with purchase/sales tracking and file-based persistence
public class PharmacySystem {
static HashMap<String, Drug> drugMap = new HashMap<>();
static HashMap<String, Supplier> supplierMap = new HashMap<>();
static Queue<Transaction> purchaseHistory = new LinkedList<>();
static Stack<Transaction> salesLog = new Stack<>();

static final String DRUG_FILE = "drugs.dat";
static final String SUPPLIER_FILE = "suppliers.dat";
static final String PURCHASE_FILE = "purchases.dat";
static final String SALES_FILE = "sales.dat";

public static void main(String[] args) {
loadData(); // Load saved data
loadData();
Scanner sc = new Scanner(System.in);

while (true) {
System.out.println("\n-- Atinka Meds Pharmacy System --");
System.out.println(
"1. Add Drug\n2. List Drugs\n3. Record Purchase\n4. Record Sale\n5. Search Drug\n6. Sort Drugs\n7. View Purchases\n8. View Sales\n9. Save & Exit");
int choice = safeIntInput(sc, "Choose an option: ");
System.out.println("\n--- Atinka Meds Pharmacy System ---");
System.out.println("1. Add Drug\n2. List Drugs\n3. Record Purchase\n4. Record Sale");
System.out.println("5. Search Drug\n6. Sort Drugs\n7. View Purchases\n8. View Sales");
System.out.println("9. Add Supplier\n10. List Suppliers\n11. Filter Suppliers\n12. Exit");
int choice = safeInt(sc, "Choice: ");

switch (choice) {
case 1 -> addDrug(sc);
Expand All @@ -29,69 +33,93 @@ public static void main(String[] args) {
case 6 -> sortDrugs(sc);
case 7 -> viewPurchases();
case 8 -> viewSales();
case 9 -> {
case 9 -> addSupplier(sc);
case 10 -> listSuppliers();
case 11 -> filterSuppliers(sc);
case 12 -> {
saveData();
System.out.println("Goodbye.");
return;
}
default -> System.out.println("Invalid option.");
}
}
}

// Validate integer input
static int safeIntInput(Scanner sc, String prompt) {
static int safeInt(Scanner sc, String prompt) {
while (true) {
System.out.print(prompt);
if (sc.hasNextInt()) {
int value = sc.nextInt();
sc.nextLine(); // consume newline
return value;
int n = sc.nextInt();
sc.nextLine();
return n;
} else {
System.out.println("Invalid input. Please enter a number.");
sc.nextLine(); // clear input
System.out.println("Invalid number.");
sc.nextLine();
}
}
}

// Validate double input
static double safeDoubleInput(Scanner sc, String prompt) {
static double safeDouble(Scanner sc, String prompt) {
while (true) {
System.out.print(prompt);
if (sc.hasNextDouble()) {
double value = sc.nextDouble();
double d = sc.nextDouble();
sc.nextLine();
return value;
return d;
} else {
System.out.println("Invalid input. Please enter a decimal number.");
System.out.println("Invalid decimal.");
sc.nextLine();
}
}
}

// Add a new drug to inventory
static void addDrug(Scanner sc) {
System.out.print("Name: ");
String name = sc.nextLine();
System.out.print("Code: ");
String code = sc.nextLine();
if (drugMap.containsKey(code)) {
System.out.println("Drug code already exists.");
return;
}
System.out.print("Expiration Date: ");
String exp = sc.nextLine();
double price = safeDoubleInput(sc, "Price: ");
int stock = safeIntInput(sc, "Stock: ");
System.out.print("Suppliers (comma separated): ");
List<String> suppliers = Arrays.asList(sc.nextLine().split(","));
drugMap.put(code, new Drug(name, code, exp, price, stock, suppliers));
double price = safeDouble(sc, "Price: ");
int stock = safeInt(sc, "Stock: ");
System.out.print("Suppliers (comma-separated IDs, or press Enter to skip): ");
String supplierInput = sc.nextLine();
List<String> suppliers = supplierInput.isEmpty() ? new ArrayList<>() : Arrays.asList(supplierInput.split(","));

// Prompt for supplier details if new supplier IDs are provided
for (String sid : suppliers) {
String supplierId = sid.trim();
if (!supplierId.isEmpty() && !supplierMap.containsKey(supplierId)) {
System.out.println("New supplier detected: " + supplierId);
System.out.print("Supplier Name: ");
String supplierName = sc.nextLine();
System.out.print("Supplier Location: ");
String location = sc.nextLine();
int deliveryTime = safeInt(sc, "Delivery Time (days): ");
supplierMap.put(supplierId, new Supplier(supplierName, location, supplierId, deliveryTime));
}
}

Drug d = new Drug(name, code, exp, price, stock, suppliers);
drugMap.put(code, d);
System.out.println("Drug added.");
}

// Display all drugs
static void listDrugs() {
if (drugMap.isEmpty()) {
System.out.println("No drugs found.");
return;
}
for (Drug d : drugMap.values()) {
System.out.println(d.code + " | " + d.name + " | Price: " + d.price + " | Stock: " + d.stock);
System.out.printf("%s | %s | ₵%.2f | Stock: %d\n", d.code, d.name, d.price, d.stock);
}
}

// Record a new purchase (incoming stock)
static void recordPurchase(Scanner sc) {
System.out.print("Drug Code: ");
String code = sc.nextLine();
Expand All @@ -100,17 +128,18 @@ static void recordPurchase(Scanner sc) {
System.out.println("Drug not found.");
return;
}
int qty = safeIntInput(sc, "Quantity: ");
int qty = safeInt(sc, "Quantity: ");
System.out.print("Buyer ID: ");
String buyer = sc.nextLine();
String time = new Date().toString();
double total = d.price * qty;
d.stock += qty;
purchaseHistory.add(new Transaction(code, qty, time, buyer, total));

Transaction t = new Transaction(code, qty, time, buyer, total);
purchaseHistory.add(t);
System.out.println("Purchase recorded.");
}

// Record a sale (outgoing stock)
static void recordSale(Scanner sc) {
System.out.print("Drug Code: ");
String code = sc.nextLine();
Expand All @@ -119,85 +148,166 @@ static void recordSale(Scanner sc) {
System.out.println("Drug not found.");
return;
}
int qty = safeIntInput(sc, "Quantity: ");
int qty = safeInt(sc, "Quantity: ");
if (qty > d.stock) {
System.out.println("Insufficient stock.");
System.out.println("Not enough stock.");
return;
}
System.out.print("Buyer ID: ");
String buyer = sc.nextLine();
String time = new Date().toString();
double total = d.price * qty;
d.stock -= qty;
salesLog.push(new Transaction(code, qty, time, buyer, total));

Transaction t = new Transaction(code, qty, time, buyer, total);
salesLog.push(t);
System.out.println("Sale recorded.");
}

// Search for a drug by name or code
static void searchDrug(Scanner sc) {
System.out.print("Enter drug name/code: ");
String query = sc.nextLine().toLowerCase();
System.out.print("Search by name/code: ");
String q = sc.nextLine().toLowerCase();
boolean found = false;
for (Drug d : drugMap.values()) {
if (d.name.toLowerCase().contains(query) || d.code.toLowerCase().contains(query)) {
System.out.println(d.code + " | " + d.name + " | Price: " + d.price + " | Stock: " + d.stock);
if (d.name.toLowerCase().contains(q) || d.code.toLowerCase().contains(q)) {
System.out.printf("%s | %s | ₵%.2f | Stock: %d\n", d.code, d.name, d.price, d.stock);
found = true;
}
}
if (!found) {
System.out.println("No drugs found.");
}
}

// Sort and display drugs by name or price
static void sortDrugs(Scanner sc) {
List<Drug> list = new ArrayList<>(drugMap.values());
System.out.println("Sort by: 1) Name 2) Price");
int opt = safeIntInput(sc, "Choice: ");
if (opt == 1) {
DrugSearchAndSort.insertionSortByName(list);
} else {
DrugSearchAndSort.insertionSortByPrice(list);
if (list.isEmpty()) {
System.out.println("No drugs to sort.");
return;
}
System.out.println("Sort by: 1) Name 2) Price");
int opt = safeInt(sc, "Option: ");
if (opt == 1) insertionSortByName(list);
else insertionSortByPrice(list);

for (Drug d : list) {
System.out.println(d.code + " | " + d.name + " | Price: " + d.price);
System.out.printf("%s | %s | ₵%.2f\n", d.code, d.name, d.price);
}
}

static void insertionSortByName(List<Drug> list) {
for (int i = 1; i < list.size(); i++) {
Drug key = list.get(i);
int j = i - 1;
while (j >= 0 && list.get(j).name.compareToIgnoreCase(key.name) > 0) {
list.set(j + 1, list.get(j));
j--;
}
list.set(j + 1, key);
}
}

static void insertionSortByPrice(List<Drug> list) {
for (int i = 1; i < list.size(); i++) {
Drug key = list.get(i);
int j = i - 1;
while (j >= 0 && list.get(j).price > key.price) {
list.set(j + 1, list.get(j));
j--;
}
list.set(j + 1, key);
}
}

// View all recorded purchases
static void viewPurchases() {
if (purchaseHistory.isEmpty()) {
System.out.println("No purchases recorded.");
return;
}
for (Transaction t : purchaseHistory) {
System.out.println(t.timestamp + " | " + t.drugCode + " | Qty: " + t.quantity + " | Buyer: " + t.buyerId);
System.out.printf("%s | %s | Qty: %d | ₵%.2f | Buyer: %s\n",
t.timestamp, t.drugCode, t.quantity, t.totalCost, t.buyerId);
}
}

// View all sales records
static void viewSales() {
if (salesLog.isEmpty()) {
System.out.println("No sales recorded.");
return;
}
for (Transaction t : salesLog) {
System.out.println(t.timestamp + " | " + t.drugCode + " | Qty: " + t.quantity + " | Buyer: " + t.buyerId);
System.out.printf("%s | %s | Qty: %d | ₵%.2f | Buyer: %s\n",
t.timestamp, t.drugCode, t.quantity, t.totalCost, t.buyerId);
}
}

static void addSupplier(Scanner sc) {
System.out.print("Supplier ID: ");
String id = sc.nextLine();
if (supplierMap.containsKey(id)) {
System.out.println("Supplier ID already exists.");
return;
}
System.out.print("Name: ");
String name = sc.nextLine();
System.out.print("Location: ");
String location = sc.nextLine();
int deliveryTime = safeInt(sc, "Delivery Time (days): ");
supplierMap.put(id, new Supplier(name, location, id, deliveryTime));
System.out.println("Supplier added.");
}

static void listSuppliers() {
if (supplierMap.isEmpty()) {
System.out.println("No suppliers found.");
return;
}
for (Supplier s : supplierMap.values()) {
System.out.printf("%s | %s | %s | Delivery: %d days\n", s.id, s.name, s.location, s.deliveryTimeDays);
}
}

static void filterSuppliers(Scanner sc) {
System.out.print("Enter location to search (or press Enter to skip): ");
String location = sc.nextLine();
int maxDeliveryDays = safeInt(sc, "Enter max delivery time (days, or -1 to skip): ");
List<Supplier> filtered = Supplier.filterSuppliers(new ArrayList<>(supplierMap.values()), location, maxDeliveryDays);
if (filtered.isEmpty()) {
System.out.println("No suppliers match the criteria.");
} else {
for (Supplier s : filtered) {
System.out.printf("%s | %s | %s | Delivery: %d days\n", s.id, s.name, s.location, s.deliveryTimeDays);
}
}
}

// Save all program data to files
static void saveData() {
try (ObjectOutputStream o1 = new ObjectOutputStream(new FileOutputStream(DRUG_FILE));
ObjectOutputStream o2 = new ObjectOutputStream(new FileOutputStream(PURCHASE_FILE));
ObjectOutputStream o3 = new ObjectOutputStream(new FileOutputStream(SALES_FILE))) {
o1.writeObject(drugMap);
o2.writeObject(purchaseHistory);
o3.writeObject(salesLog);
try (ObjectOutputStream out1 = new ObjectOutputStream(new FileOutputStream(DRUG_FILE));
ObjectOutputStream out2 = new ObjectOutputStream(new FileOutputStream(PURCHASE_FILE));
ObjectOutputStream out3 = new ObjectOutputStream(new FileOutputStream(SALES_FILE));
ObjectOutputStream out4 = new ObjectOutputStream(new FileOutputStream(SUPPLIER_FILE))) {
out1.writeObject(drugMap);
out2.writeObject(purchaseHistory);
out3.writeObject(salesLog);
out4.writeObject(supplierMap);
System.out.println("Data saved.");
} catch (IOException e) {
System.out.println("Error saving data.");
}
}

// Load saved data from disk into memory
static void loadData() {
try (ObjectInputStream o1 = new ObjectInputStream(new FileInputStream(DRUG_FILE));
ObjectInputStream o2 = new ObjectInputStream(new FileInputStream(PURCHASE_FILE));
ObjectInputStream o3 = new ObjectInputStream(new FileInputStream(SALES_FILE))) {
drugMap = (HashMap<String, Drug>) o1.readObject();
purchaseHistory = (Queue<Transaction>) o2.readObject();
salesLog = (Stack<Transaction>) o3.readObject();
try (ObjectInputStream in1 = new ObjectInputStream(new FileInputStream(DRUG_FILE));
ObjectInputStream in2 = new ObjectInputStream(new FileInputStream(PURCHASE_FILE));
ObjectInputStream in3 = new ObjectInputStream(new FileInputStream(SALES_FILE));
ObjectInputStream in4 = new ObjectInputStream(new FileInputStream(SUPPLIER_FILE))) {
drugMap = (HashMap<String, Drug>) in1.readObject();
purchaseHistory = (Queue<Transaction>) in2.readObject();
salesLog = (Stack<Transaction>) in3.readObject();
supplierMap = (HashMap<String, Supplier>) in4.readObject();
System.out.println("Data loaded.");
} catch (Exception e) {
System.out.println("No previous data found. Starting fresh.");
System.out.println("Starting with empty system...");
}
}
}
}
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