""" Purpose: produce spell-check corrected text
"""

# define annotation markers
CORRECTED_WORD_MARKER = "*"
UNKNOWN_WORD_MARKER   = "_"

# get access to url support
import url

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

# 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 )

# split contents into a list of good words
good_words = contents.split()

# 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()

# what now -- accumulate the spell check output of the user text
output = ""

for current_word in text :
    # look at each word in the given input
    #    if word is good, add it to output
    if ( current_word in good_words ) :
        printed_word = current_word
    #    otherwise if the word is a known misspelling, add the correction to the output
    elif ( current_word in misspellings_dictionary ) :
        correction = misspellings_dictionary.get( current_word )
        printed_word = CORRECTED_WORD_MARKER + correction + CORRECTED_WORD_MARKER
    #    otherwise, add flagged word to output
    else :
        printed_word = UNKNOWN_WORD_MARKER + current_word + UNKNOWN_WORD_MARKER
    # update our accumulator with the necessary output, stored in printed_word
    output = output + printed_word + " "

# print spell check results
print( output )