''' Purpose: produce spell-check corrected text
'''
# define annotation markers
CORRECTED_WORD_START_MARKER = "*"
CORRECTED_WORD_END_MARKER   = "*"

UNKNOWN_WORD_START_MARKER = "?"
UNKNOWN_WORD_END_MARKER   = "?"

# get access to url support
import url

# CS 1112 most common words
MOST_COMMON_URL = "http://www.cs.virginia.edu/~cs1112/words/most-common"

# CS 1112 words correctsions CSV
CORRECTIONS_URL = "http://www.cs.virginia.edu/~cs1112/words/corrections"

# get contents of most common words url
contents = url.get_contents( MOST_COMMON_URL )  # get_contents() returns a large string of everything on the webpage

# split contents into a list of good words
good_words = contents.split()   # url.get_words( MOST_COMMON_URL ) # This is a list of words now

# get corrections dictionary
misspellings_dictionary  = url.get_dictionary( CORRECTIONS_URL )

# get the user text to be checked
reply = input( "Enter text: " )

# convert reply into a list of words
text = reply.split()    # list of words is stored in text

# what now -- accumulate the spell check output of the user text
output = '' # Accumulator where we wanna build up this string with our words list

for current_word in text:
    # Find out if the current word is correctly spelled
    if ( current_word in good_words ):  # If it's aleady correctly spelled, just use the word!
        meaning = current_word
    # Find out if the current word is commonly misspelled and find the correct spelling using the dictionary
    elif ( current_word in misspellings_dictionary ): # If it's not correctly spelling, try to find the right spelling!
        meaning = misspellings_dictionary.get( current_word ) # Get the dictionary mapping of the current_word
        meaning = '*' + meaning + '*'
    # We can't find the correct spelling (unknown)
    else:   # It's misspelled and we can't find the dictionary, it's an unknown spelling
        meaning = '?' + current_word + '?'
    output = output + meaning + ' ' # Add the converted meanings of each word (correct spellings) to our output string

# print spell check results
print( output )