import random

# Author:  James Tam
# Version: November 4, 2021
# Learning objective: illustrating the proper approach to copy data from one
# list to another (via a deep copy).


MAX_ROWS = 2
MAX_COLUMNS = 20
PERCENTAGE_BOOST = 10 

# args(reference to a list
# increases each grade by the amount specified by PERCENTAGE_BOOST
# return(nothing)
def boostGrades(aList):
    r = -1
    c = -1
    bonus = -1
    for r in range(0,MAX_ROWS,1):
        for c in range(0,MAX_COLUMNS,1):
            bonus = aList[r][c] * (PERCENTAGE_BOOST/100)
            aList[r][c] = aList[r][c] + bonus

# args(2List)
# return (float)
# Function calculates and returns the average of the grades in the list
def calculateAverage(aList):
    r = -1
    c = -1
    gradeAverage = -1
    gradeTotal = 0
    r = 0
    while (r < MAX_ROWS):
        c = 0
        while (c < MAX_COLUMNS):
            gradeTotal = gradeTotal + aList[r][c]
            c = c + 1
        r = r + 1
    gradeAverage = gradeTotal / (MAX_ROWS * MAX_COLUMNS)
    return(gradeAverage)

# args(none)
# Creates a 2D list using the repetition operator
# return (reference to the list, integer,integer)
def createList():
    #Declare variables for function
    aList = []
    tempRow = []
    tempGrade = -1
    r = -1
    c = -1

    for r in range(0,MAX_ROWS,1):
        tempGrade = random.randrange(0,5)
        tempRow = [tempGrade] * MAX_COLUMNS
        aList.append(tempRow)
    return(aList)

# args(reference to a list, float
# displays each element of list with a row on it's own line and with the grade average
# return(nothing)
def display(aList,anAverage):
    #Declare variables for function
    r = -1
    c = -1

    print("Average GPA=%.2f" %(anAverage))
    # Each iteration of the outter loop accesses another row
    r = 0
    while (r < MAX_ROWS):
        c = 0
        # Each iteration of the inner loop accesses another element along that row
        while (c < MAX_COLUMNS):
            #Display each element along a row on the same line
            print("%.2f " %(aList[r][c]),end="")
            c = c + 1
        print("<EOL>")  #After each row printed add a new line (EOL)
        r = r + 1

# args(reference to a list
# displays each element of list with a row on it's own line
# return(a new list with a copy of data in the elements of original list)
def makeCopy(original):
    r = -1
    c = -1
    copy = createList()
    for r in range(0,MAX_ROWS,1):
        for c in range(0,MAX_COLUMNS,1):
            copy[r][c] = original[r][c]
    return(copy)

#Starting execution point for the program
def start():
    #Declare variables local to start
    originalGrades = []
    boostedGrades = []
    originalAverage = -1
    boostedAverage = -1

    originalGrades = createList()
    originalAverage = calculateAverage(originalGrades)
    boostedGrades = makeCopy(originalGrades)
    boostGrades(boostedGrades)
    boostedAverage = calculateAverage(boostedGrades)
    print("Original grades and the average GPA")
    display(originalGrades,originalAverage)
    print()
    print("Boosted grades and the boosted average GPA")
    display(boostedGrades,boostedAverage)    

start()