''' Purpose: demonstrate while loop and dict mappings
'''

# get access to url support
import url

# where is the dog to notoriety mappings
PUPPIES_CSV = 'http://www.cs.virginia.edu/~cs1112/datasets/csv/puppies.csv'

# get csv contents
database = url.get_csv_dataset( PUPPIES_CSV )  # what should database be?

# get data set
header  = database[ 0 ]    # what should header be? what does it represent?
dataset = database[ 1 : ]  # what should dataset be? what does it represent?

# print( header )
# print( dataset )
# print( )

# create a dictionary that helps us find out what a dog "means"
# i.e. what fame the dog is associated with

dog_to_fame = {}

for row in dataset:  # what is row?
    # want to grab 2 pieces of information based on the header
    dog, fame = row  # why don't we need to split the row? ask yourself: is row a string?

    # print( row )

    # we have the information, so let's add this association to our dictionary
    dog_to_fame[ dog ] = fame  # this line maps the fame to the dog and adds this mapping to our dictionary

    # we could have done this with lists and matching indices, but dictionaries make this process easier

# print( dog_to_fame )  # how does dataset differ from dog_to_fame?

# reply = input( "Enter a dog name: " )  # what happens when we enter Odie?
# name = reply.strip()
# fame = dog_to_fame.get( name ) # this line more robust
                               # instead of giving back an error if we don't know about a key,
                                    # it compiles and gives back None
# fame = dog_to_fame[ name ]  # how does this line differ syntactically and semantically
                                    # from dog_to_fame[ dog ] = fame?
# d[ k ] = v assigns v to be associated with v
# v = d[ k ] stores the value of k in v
# print( fame )

# repeatedly get dog names until there are no more
# the word "until" tends to mean we want to use a while loop

looking_for_dog_names = True

while ( looking_for_dog_names == True ):  # could just say while ( looking_for_dog_names ):
    reply = input( "Enter a dog name: " )
    name = reply.strip()
    fame = dog_to_fame.get( name )
    if ( name == '' ):  # if the user entered the empty string, they are no longer looking for dog names
        # == tells us if what is on the left is the same as what is on the right
        looking_for_dog_names = False
    elif ( name not in dog_to_fame.keys() ):  # if the dog is not in our keys, print nothing
        # the in keyword tells us if an element is contained in some kind of sequence or collection
        print()
    else: # there should be a fame, print the fame
        print( fame )
    # you could delineate or express these conditions in a lot of ways;
        # so long as you are changing the condition of the while loop at some point and are
        # returning the appropriate output, you should be good to go