# Create and write file
with open("students.txt", "w") as file:
    file.write("Ali,17.8\n")
    file.write("Sara,18.5\n")
    file.write("Reza,15.2\n")
    file.write("Nima,18.1\n")
    file.write("Parsa,16.4\n")

# Read file
students = []

with open("students.txt", "r") as file:
    for line in file:
        name, gpa = line.strip().split(",")
        students.append((name, float(gpa)))

# Total students
total_students = len(students)

# Calculate average GPA
total_gpa = 0
top_student = ""
top_gpa = -1

for name, gpa in students:
    total_gpa += gpa

    if gpa > top_gpa:
        top_gpa = gpa
        top_student = name

average_gpa = total_gpa / total_students

# Bonus: students above 18
above_18 = []

for name, gpa in students:
    if gpa > 18:
        above_18.append((name, gpa))

# Output
print("Total Students:", total_students)
print("Average GPA:", round(average_gpa, 1))

print("\nTop Student:")
print(f"{top_student} ({top_gpa})")

print("\nStudents with GPA > 18:")
for name, gpa in above_18:
    print(f"{name} ({gpa})")

import csv
class Student:
    def __init__(self, name, gpa, credits):
        self.name = name
        self.gpa = gpa
        self.credits = credits

    def get_status(self):
        if self.credits >= 120:
            return "Graduated"

        return "In Progress"

    def show_info(self):
        print(f"Name: {self.name}")
        print(f"GPA: {self.gpa}")
        print(f"Credits: {self.credits}")
        print(f"Status: {self.get_status()}")

def load_students(filename):
    students = []

    try:
        with open(filename, "r", encoding="utf-8") as file:
            reader = csv.DictReader(file)

            for row in reader:
                student = Student(
                    name=row["name"].strip(),
                    gpa=float(row["gpa"]),
                    credits=int(row["credits"])
                )
                students.append(student)

    except FileNotFoundError:
        print(f"Error: {filename} was not found.")

    except (ValueError, KeyError):
        print("Error: Invalid data in CSV file.")

    except OSError as error:
        print(f"Error reading file: {error}")

    return students

def show_summary(students):
    if not students:
        print("No student data available.")
        return

    average_gpa = sum(student.gpa for student in students) / len(students)
    top_student = max(students, key=lambda student: student.gpa)

    high_gpa_students = [
        student for student in students
        if student.gpa >= 18
    ]

    low_gpa_students = [
        student for student in students
        if student.gpa < 16
    ]

    print("\n= Student Analysis System =")

    print(f"\nTotal Students: {len(students)}")
    print(f"Average GPA: {average_gpa:.2f}")
    print(
        f"Top Student: {top_student.name} "
        f"({top_student.gpa})"
    )

    print("\nStudents With GPA >= 18:")

    for student in high_gpa_students:
        print(student.name)

    print(f"\nCount: {len(high_gpa_students)}")

    print("\nStudents With GPA < 16:")

    for student in low_gpa_students:
        print(student.name)

    print(f"\nCount: {len(low_gpa_students)}")


def search_student(students):
    name = input("\nEnter student name: ").strip()

    if not name:
        print("Please enter a valid name.")
        return

    for student in students:
        if student.name.lower() == name.lower():
            print()
            student.show_info()
            return

    print("Student not found!")

def show_top_students(students):
    top_students = sorted(
        students,
        key=lambda student: student.gpa,
        reverse=True
    )

    print("\n= Top Students =")

    for rank, student in enumerate(top_students, start=1):
        print(f"{rank}. {student.name} - {student.gpa}")


def show_graduated_students(students):
    graduated_students = [
        student for student in students
        if student.get_status() == "Graduated"
    ]

    print("\n= Graduated Students =")

    if not graduated_students:
        print("No graduated students found.")
        return

    for student in graduated_students:
        print(
            f"{student.name} - "
            f"{student.credits} Credits"
        )

def show_menu():
    print("\n===== Student Analysis Menu =====")
    print("1. Show Summary")
    print("2. Search Student")
    print("3. Show Top Students")
    print("4. Show Graduated Students")
    print("5. Exit")

def main():
    students = load_students("students.csv")

    if not students:
        return

    while True:
        show_menu()
        choice = input("\nEnter your choice: ").strip()

        if choice == "1":
            show_summary(students)

        elif choice == "2":
            search_student(students)

        elif choice == "3":
            show_top_students(students)

        elif choice == "4":
            show_graduated_students(students)

        elif choice == "5":
            print("\nProgram closed.")
            break
        else:
            print("\nInvalid choice. Please select 1 to 5.")
if __name__ == "__main__":
    main()