Invoice Generator added

Src/Invoice_Generator_System/InvoiceGenerator.cpp

@@ -0,0 +1,322 @@
+// InvoiceGenerator.cpp
+// Works on Dev-C++, Old MinGW, Linux, Windows
+// Compile: g++ InvoiceGenerator.cpp -o InvoiceGenerator
+
+#include <iostream>
+#include <fstream>
+#include <vector>
+#include <string>
+#include <iomanip>
+#include <sstream>
+
+#ifdef _WIN32
+#include <direct.h> // for _mkdir
+#else
+#include <sys/stat.h> // for mkdir
+#endif
+
+using namespace std;
+
+// ----------- Utility: Create Directory -------------
+void makeDirectory(const string &dirName)
+{
+#ifdef _WIN32
+    _mkdir(dirName.c_str()); // Windows
+#else
+    mkdir(dirName.c_str(), 0777); // Linux
+#endif
+}
+
+// Check if file exists
+bool fileExists(const string &filename)
+{
+    ifstream f(filename.c_str());
+    return f.good();
+}
+
+// ----------- Item Class -------------
+class Item
+{
+public:
+    string name;
+    int quantity;
+    double price;
+
+    Item() : quantity(0), price(0) {}
+
+    Item(string n, int q, double p)
+        : name(n), quantity(q), price(p) {}
+
+    double getTotal() const
+    {
+        return quantity * price;
+    }
+};
+
+// ----------- Invoice Class -------------
+class Invoice
+{
+public:
+    int invoiceID;
+    string customerName;
+    vector<Item> items;
+    double subtotal, tax, total;
+    double taxRate; // NEW: user-entered tax rate %
+
+    Invoice(int id, string cname, double tr)
+        : invoiceID(id), customerName(cname), subtotal(0),
+          tax(0), total(0), taxRate(tr) {}
+
+    void addItem(const Item &it)
+    {
+        items.push_back(it);
+    }
+
+    void calculateTotals()
+    {
+        subtotal = 0;
+        for (auto &it : items)
+            subtotal += it.getTotal();
+
+        tax = subtotal * (taxRate / 100.0);
+        total = subtotal + tax;
+    }
+
+    string filename() const
+    {
+        return "invoices/invoice_" + to_string(invoiceID) + ".txt";
+    }
+
+    void saveToFile()
+    {
+        makeDirectory("invoices");
+
+        ofstream out(filename().c_str());
+        if (!out)
+        {
+            cout << "Error saving invoice file!\n";
+            return;
+        }
+
+        out << "----------------------------------------\n";
+        out << "Invoice ID: " << invoiceID << "\n";
+        out << "Customer Name: " << customerName << "\n";
+        out << "----------------------------------------\n\n";
+
+        out << left << setw(20) << "Item Name"
+            << setw(10) << "Qty"
+            << setw(10) << "Price"
+            << setw(10) << "Total" << "\n";
+        out << "--------------------------------------------------\n";
+
+        for (auto &it : items)
+        {
+            out << left << setw(20) << it.name
+                << setw(10) << it.quantity
+                << setw(10) << fixed << setprecision(2) << it.price
+                << setw(10) << fixed << setprecision(2) << it.getTotal()
+                << "\n";
+        }
+
+        out << "--------------------------------------------------\n\n";
+        out << "Subtotal: " << subtotal << "\n";
+        out << "Tax (" << taxRate << "%): " << tax << "\n";
+        out << "Total: " << total << "\n";
+        out << "----------------------------------------\n";
+
+        out.close();
+    }
+};
+
+// ----------- Invoice Manager -------------
+class InvoiceManager
+{
+public:
+    string indexFile;
+
+    InvoiceManager()
+    {
+        indexFile = "invoices/index.txt";
+        makeDirectory("invoices");
+
+        if (!fileExists(indexFile))
+        {
+            ofstream make(indexFile.c_str());
+            make.close();
+        }
+    }
+
+    int generateID()
+    {
+        ifstream f(indexFile.c_str());
+        string line;
+        int maxID = 1000;
+
+        while (getline(f, line))
+        {
+            if (line.empty())
+                continue;
+
+            stringstream ss(line);
+            string idStr;
+            getline(ss, idStr, '|');
+
+            int id = stoi(idStr);
+            if (id > maxID)
+                maxID = id;
+        }
+        return maxID + 1;
+    }
+
+    void saveToIndex(int id, string cname, string fname)
+    {
+        ofstream f(indexFile.c_str(), ios::app);
+        f << id << "|" << cname << "|" << fname << "\n";
+        f.close();
+    }
+
+    void createInvoice()
+    {
+        cin.ignore();
+        cout << "Enter customer name: ";
+        string cname;
+        getline(cin, cname);
+
+        cout << "Enter tax percentage (%): ";
+        double taxPercent;
+        cin >> taxPercent;
+        cin.ignore();
+
+        int id = generateID();
+        Invoice inv(id, cname, taxPercent);
+
+        while (true)
+        {
+            cout << "\nEnter item name (leave blank to finish): ";
+            string iname;
+            getline(cin, iname);
+
+            if (iname.empty())
+                break;
+
+            cout << "Quantity: ";
+            int qty;
+            cin >> qty;
+
+            cout << "Price: ";
+            double price;
+            cin >> price;
+            cin.ignore();
+
+            inv.addItem(Item(iname, qty, price));
+        }
+
+        if (inv.items.empty())
+        {
+            cout << "No items added. Invoice cancelled.\n";
+            return;
+        }
+
+        inv.calculateTotals();
+        inv.saveToFile();
+
+        saveToIndex(inv.invoiceID, inv.customerName, inv.filename());
+
+        cout << "\nInvoice created and saved successfully!\n";
+    }
+
+    void viewInvoiceByID()
+    {
+        cout << "Enter Invoice ID: ";
+        int id;
+        cin >> id;
+
+        ifstream f(indexFile.c_str());
+        string line;
+
+        while (getline(f, line))
+        {
+            stringstream ss(line);
+            string idStr, cname, fname;
+
+            getline(ss, idStr, '|');
+            getline(ss, cname, '|');
+            getline(ss, fname, '|');
+
+            if (stoi(idStr) == id)
+            {
+                ifstream invFile(fname.c_str());
+                cout << "\n----- Invoice Content -----\n\n";
+                string ln;
+                while (getline(invFile, ln))
+                    cout << ln << "\n";
+                return;
+            }
+        }
+
+        cout << "Invoice not found!\n";
+    }
+
+    void showAllInvoices()
+    {
+        ifstream f(indexFile.c_str());
+        string line;
+
+        cout << "\nStored Invoices:\n";
+        cout << "-------------------------------------------\n";
+
+        while (getline(f, line))
+        {
+            if (line.empty())
+                continue;
+
+            stringstream ss(line);
+            string id, cname, fname;
+            getline(ss, id, '|');
+            getline(ss, cname, '|');
+            getline(ss, fname, '|');
+
+            cout << "ID: " << id << " | Name: " << cname
+                 << " | File: " << fname << "\n";
+        }
+    }
+};
+
+// ----------- MAIN MENU -------------
+int main()
+{
+    InvoiceManager manager;
+
+    while (true)
+    {
+        cout << "\n----------------------------------------\n";
+        cout << "         INVOICE GENERATOR SYSTEM        \n";
+        cout << "----------------------------------------\n";
+        cout << "1. Create Invoice\n";
+        cout << "2. View Invoice by ID\n";
+        cout << "3. Show All Invoices\n";
+        cout << "4. Exit\n";
+        cout << "Enter choice: ";
+
+        int choice;
+        cin >> choice;
+
+        switch (choice)
+        {
+        case 1:
+            manager.createInvoice();
+            break;
+        case 2:
+            manager.viewInvoiceByID();
+            break;
+        case 3:
+            manager.showAllInvoices();
+            break;
+        case 4:
+            cout << "Exiting...\n";
+            return 0;
+        default:
+            cout << "Invalid choice!\n";
+        }
+    }
+}