# GradeRecordsJson Example
# Answer questions based on the grade-records.json file

import json

fin = open("grade-records.json", "r")
json_string = fin.read( )
arr = json.loads(json_string)

# Next statement is for debugging
# print(arr)

# Enter desired first and last name.
desired_first_name = input("Enter desired first name: ")
desired_last_name = input("Enter desired last name: ")

# Print the course name and course number
# of all the courses that the desired
# person has taken.
for d in arr:
    if desired_first_name == d["first_name"] and \
       desired_last_name == d["last_name"]:
        print(d["course_number"], d["course_name"])
print( )
        
# Print the total credit hours of the desired person.
total_credit_hours = 0
for d in arr:
    if desired_first_name == d["first_name"] and \
       desired_last_name == d["last_name"]:
        total_credit_hours += d["credit_hours"]
print(f"Total credit hours: {total_credit_hours}")
print( )

# Print the GPA of the desired person.
grade_dict = {'A': 4, 'B': 3, 'C': 2, 'D': 1, 'F': 0} 
total_credit_hours = 0
total_grade_points = 0.0
for d in arr:
    if desired_first_name == d["first_name"] and \
       desired_last_name == d["last_name"]:
        credit_hours = d["credit_hours"]
        grade = d["grade"]
        grade_points = grade_dict[grade] * credit_hours
        total_credit_hours += credit_hours
        total_grade_points += grade_points

gpa = total_grade_points / total_credit_hours
    
print(f"GPA: {round(gpa, 2)}")