Patient.java

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/*
 * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
 * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
 */
package hospitalmanagementsystem;

/**
 *
 * @author egehanhatipoglu
 */

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class Patient {
    private int id;
    private String firstName;
    private String lastName;
    private String nationalId;
    private String phone;
    private LocalDate birthDate;
    
    // Head of the Singly Linked List that stores the patient's medical history.
    // Each node in this list represents a past visit/examination.
    private Visit head; 

    // ============================================
    // INNER CLASS: Visit (Linked List Node)
    // ============================================
    // Represents a single node in the medical history chain. 
    // Contains the visit details (data) and a pointer to the next visit (next).
    private class Visit {
        LocalDateTime date;
        Doctor doctor;
        String notes;
        Visit next;

        Visit(LocalDateTime date, Doctor doctor, String notes) {
            this.date = date;
            this.doctor = doctor;
            this.notes = notes;
            this.next = null;
        }

        
        public String toString() {
            DateTimeFormatter f = DateTimeFormatter.ofPattern("dd/MM/yyyy HH:mm");
            return "Date: " + date.format(f) + 
                   ", Doctor: Dr. " + doctor.getFirstName() + " " + doctor.getLastName() + 
                   ", Notes: " + notes;
        }
    }

    public Patient(int id, String firstName, String lastName, String nationalId, String phone, LocalDate birthDate) {
        this.id = id;
        this.firstName = firstName;
        this.lastName = lastName;
        this.nationalId = nationalId;
        this.phone = phone;
        this.birthDate = birthDate;
        this.head = null;
    }

    // Adds a new medical record to the end of the Linked List.
    // Traverses the list to find the last node and links the new visit.
    // Time Complexity: O(n) (where n is the number of past visits).
    public void addVisit(LocalDateTime date, Doctor doctor, String notes) {
        
         if (doctor == null) {
            System.out.println("✗ Error: Doctor cannot be null!");
            return;
        }
        
        if (date == null) {
            System.out.println("✗ Error: Date cannot be null!");
            return;
        }
        
        Visit newVisit = new Visit(date,doctor, notes);
        
        // Case 1: List is empty, new node becomes head
        if (head == null) {
            head = newVisit;
        } else {
            // Case 2: Traverse to the end and append
            Visit current = head;
            while (current.next != null) {
                current = current.next;
            }
            current.next = newVisit;
        }
    }

    // Traverses the Linked List from head to tail to display the full medical history.
    // Essential for doctors to review past treatments.
    public void printHistory() {
        if (head == null) {
            System.out.println("  No medical history available.");
            return;
        }
        Visit current = head;
        int count = 1;
        while (current != null) {
            System.out.println("  " + count + ". " + current);
            current = current.next;
            count++;
        }
    }

    public void setId(int id) {
        this.id = id;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public void setNationalId(String nationalId) {
        this.nationalId = nationalId;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public void setBirthDate(LocalDate birthDate) {
        this.birthDate = birthDate;
    }

    public void setHead(Visit head) {
        this.head = head;
    }

    
    // Getters
    public int getId() { return id; }
    public String getFirstName() { return firstName; }
    public String getLastName() { return lastName; }
    public String getNationalId() { return nationalId; }
    public String getPhone() { return phone; }
    public LocalDate getBirthDate() { return birthDate; }
    
    
    
}