''' Purpose: determine a rough estimate of the geocenter of the
        continental USA
'''

# get access to web-based data support
import url

# specify dataset web location
CSV_WEB_FOLDER = 'http://www.cs.virginia.edu/~cs1112/datasets/csv/'

USA_DATASET    = CSV_WEB_FOLDER + 'continental-usa.csv'

# get the dataset of interest
dataset = url.get_dataset( USA_DATASET )

# print(dataset)
# determine webfile header and location data
header    = dataset[ 0 ] # THE FIRST ROW IN OUR DATASET
# ['Zip Code', 'City','State','Latitude','Longitude']
locations = dataset[ 1 : ] # all of the other rows (the data with specific
# information with cities and everything)

# determine geocenter

# a loop that might be helpful for solving the problem
latitudes = []
longitudes = []
for entry in locations :
    # print('Entry=', entry) # entry is each row in our locations list [[],[]..]
    zipcode, town, state, latitude, longitude = entry # Assign 5 variables to
                                                       # small parts of entry
    latitudes.append( latitude )
    longitudes.append( longitude )

    # Your lists can consist of anything: ints, floats, strings, more lists
    # etc.
    # So you're gonna get a list of floats (decimals) of latitudes and longitudes

n = len( latitudes ) # The number of latitudes and longitudes and entries I have
sum_latitudes = sum( latitudes ) # sum function sums up every value in list
sum_longitudes = sum( longitudes ) # sum function sums up every value in list
average_latitude = sum_latitudes / n
average_longitude = sum_longitudes / n
guess1_lat , guess1_long = average_latitude, average_longitude

min_latitude = min( latitudes )
min_longitude = min( longitudes )
max_latitude = max( latitudes )
max_longitude = max( longitudes )
guess2_lat = ( max_latitude + min_latitude ) / 2
guess2_long = ( max_longitude + min_longitude ) / 2

middle_index = n//2
sorted_latitudes = sorted( latitudes )
sorted_longitudes = sorted( longitudes )
guess3_lat = sorted_latitudes[middle_index]
guess3_long = sorted_longitudes[middle_index]

print(guess1_lat, guess1_long)
print(guess2_lat, guess2_long)
print(guess3_lat, guess3_long)

s = ['abc','xyz','123','ABC']
t = sorted( s )
print( t )
# if you do a,b = ['banana', 'apple'] then a is assigned banana
# and b is assigned apple
# s = 'banana apple'
# a, b = s.split() -> a, b = ['banana', 'apple']