main.cpp

#include <bits/stdc++.h>
using namespace std;

// Constants
const int MAX_TASKS = 100;

// Task Data
struct Task {
    int ID;
    string Title;
    string Description;
    int Priority;         // 1 (High) to 5 (Low)
    string DueDate;       // Format: YYYY-MM-DD
    set<string> Tags;     // Unique tags
};

// Function Prototypes
void Input_One_Task(Task &Cur_Task, int id);
void Input_Tasks(vector<Task> &Tasks);
void Display_Header();
void Display_Task(const Task &Cur_Task);
void Display_All_Tasks(const vector<Task> &Tasks);
void Sort_Tasks_By_Priority(vector<Task> &Tasks);
void Search_By_Tag(const vector<Task> &Tasks);
void Run_Task_System();

// --- Function Definitions ---

// Input a single task
void Input_One_Task(Task &Cur_Task, int id) {
    Cur_Task.ID = id;
    cin.ignore();
    cout << "Enter Title: ";
    getline(cin, Cur_Task.Title);

    cout << "Enter Description: ";
    getline(cin, Cur_Task.Description);

    cout << "Enter Priority (1-5): ";
    cin >> Cur_Task.Priority;
    cin.ignore();

    cout << "Enter Due Date (YYYY-MM-DD): ";
    getline(cin, Cur_Task.DueDate);

    cout << "Enter Tags (space-separated): ";
    string line, tag;
    getline(cin, line);
    stringstream ss(line);
    while (ss >> tag) {
        Cur_Task.Tags.insert(tag);
    }
}

// Input multiple tasks
void Input_Tasks(vector<Task> &Tasks) {
    char choice;
    do {
        if (Tasks.size() >= MAX_TASKS) {
            cout << "Reached Maximum Task Capacity\n";
            break;
        }
        Task t;
        Input_One_Task(t, Tasks.size() + 1);
        Tasks.push_back(t);
        cout << "Add another task? (Y/N): ";
        cin >> choice;
    } while (choice == 'Y' || choice == 'y');
}

// Display table header
void Display_Header() {
    cout << left << setw(5) << "ID"
         << setw(20) << "Title"
         << setw(12) << "Priority"
         << setw(15) << "Due Date"
         << "Tags\n";
    cout << "--------------------------------------------------------------\n";
}

// Display a single task
void Display_Task(const Task &Cur_Task) {
    cout << left << setw(5) << Cur_Task.ID
         << setw(20) << Cur_Task.Title
         << setw(12) << Cur_Task.Priority
         << setw(15) << Cur_Task.DueDate;
    for (const string &tag : Cur_Task.Tags) {
        cout << tag << " ";
    }
    cout << "\n";
}

// Display all tasks
void Display_All_Tasks(const vector<Task> &Tasks) {
    cout << "\n===== Task Records =====\n";
    Display_Header();
    for (const Task &t : Tasks) {
        Display_Task(t);
    }
}

// Sort tasks by priority
void Sort_Tasks_By_Priority(vector<Task> &Tasks) {
    sort(Tasks.begin(), Tasks.end(), [](const Task &a, const Task &b) {
        return a.Priority < b.Priority;
    });
    cout << "✅ Sorted by Priority.\n";
}

// Search tasks by tag
void Search_By_Tag(const vector<Task> &Tasks) {
    string tag;
    cout << "Enter tag to search: ";
    cin >> tag;
    cin.ignore();

    bool found = false;
    cout << "\n--- Tasks With Tag [" << tag << "] ---\n";
    for (const Task &t : Tasks) {
        if (t.Tags.count(tag)) {
            Display_Task(t);
            found = true;
        }
    }

    if (!found) {
        cout << "❌ No tasks found with that tag.\n";
    }
}

// Control system
void Run_Task_System() {
    vector<Task> Tasks;
    int choice;

    do {
        cout << "\n=== Task Management System ===\n";
        cout << "1. Add Tasks\n";
        cout << "2. View All Tasks\n";
        cout << "3. Sort by Priority\n";
        cout << "4. Search by Tag\n";
        cout << "5. Exit\n";
        cout << "Choose an option: ";
        cin >> choice;

        switch (choice) {
            case 1:
                Input_Tasks(Tasks);
                break;
            case 2:
                Display_All_Tasks(Tasks);
                break;
            case 3:
                Sort_Tasks_By_Priority(Tasks);
                break;
            case 4:
                Search_By_Tag(Tasks);
                break;
            case 5:
                cout << "👋 Exiting...\n";
                break;
            default:
                cout << "❌ Invalid choice.\n";
        }

    } while (choice != 5);
}

// Main function
int main() {
    Run_Task_System();
    return 0;
}