''' Purpose: translate user text to English

    given a text, try top-down approach to translate it
    translate text --> translate line by line --> translate word by word
'''

import url

DEFAULT_URL = 'http://www.cs.virginia.edu/~cs1112/words/babel'

DEFAULT_DICTIONARY = url.get_dictionary( DEFAULT_URL )

def passage( text, dictionary = DEFAULT_DICTIONARY ) :
    ''' returns a translation of text according to dictionary, where
        text may have embedded \n's

        default dictionary is the babel dictionary if not given a dictionary
    '''
    # text is a giant string where there are multiple lines separated by "\n"

    # convert the text into lines so we can translate each line at a time
    # split on new line character ("\n")
    lines = text.split( "\n" )

    # we want our result, which is the translated version of text, to be a giant string as well
    # we need to build this up (accumulation )because we don't have the capability to
    # translate the entire text for now
    result = ''    # string accumulation --> every time we translate a line, we add on to this string

    for phrase in lines:
        # need to translate each phrase in lines
        convert = line( phrase, dictionary )   # we have a function (line 48)
                                   # that will translate a line/phhrase and return that translation as a string

        # we add the translated phrase to the string accumulator
        # since this is a line, we separate each line by a newline character ('\n') at the end
        result = result + convert + "\n"

    # we've broken down the giant text into lines --> for each of those lines, we translate each phrase at a time
    # breaking things down to smaller and smaller problems
    # we can't use phrase in a dictionary because the dictionary only contains word --> word translation
    # so we need another function to handle this
    return result



def line( string, dictionary = DEFAULT_DICTIONARY ) :
    ''' returns a translation of string according to dictionary, where
        string is composed of zero or more words

        Translate a single line of text given (string)
    '''

    # convert the string into a list of words
    # string is a phrase, each word separated by space
    words = string.split()

    # need to hand back the translated sentence after translated word by word
    # need to accumulate the definition of each word in words
    result = ''

    # for each word in words, we need to translate it
    for w in words:
        conversion = word( w, dictionary )
        # we have another function called word() where we can pass in a single word
        # and it will hand back the translation for that single word

        # then we add the translation/conversion to our accumulator and add a space at the end
        # to separate each word
        result = result + conversion + ' '

    return result

def word( string, dictionary = DEFAULT_DICTIONARY) :
    ''' returns a translation of the string according to dictionary,
        where string is composed of a single word.  if the translation
        is unknown the function return the word within <>

        translate a single word from our dictionary
    '''

    # if string/word is in the dictionary, then hand back the translation
    if ( string in dictionary ):
        result = dictionary.get( string )  # get the translation of the string

    # otherwise, put <> around the original word
    else:
        result = '<' + string + '>'

    return result

if ( __name__ == '__main__' ) :
    translation = word( 'lapiz' )
    print( translation )
    print()

    translation = line( 'como esta eso' )
    print( translation )
    print()

    translation = passage( 'tun vous savez hvor\nmi pencil ist' )
    print( translation )
    print()

    DIGIT_URL = 'http://www.cs.virginia.edu/~cs1112/words/digits'

    d = {'0': 'zero', '1': 'one', '2': 'two', '3': 'three', '4': 'four', '5': 'five', '6': 'six', '7': 'seven', '8': 'eight', '9': 'nine'}

    translation =  passage( '0 O 1 2 3 4 5', dictionary = d )
    print( translation )
    print()

    text = ''' dubailte dubailte kesusahan und guaio
               umlilo adolebitque und ketel bombolla
               umucu di una pantanoso neidr
               dans der ketel bouyi und cuire
               oog di tritons und kaki di rano
               yun di fledermoyz und lingua di chien
               viperae foarke und blyn cuc stik
               moo fotur und ovlet tis
               pre eng viehatys di voimakas guaio
               mag un inferno salda bouyi und bombolla
    '''

    translation = passage( text )
    print( translation )