'''
2021-05-22
To Dead Code
Previously Entitled: utilities_email_refactored

Created on Mar 7, 2019
@author: Brett Paufler
Copyright Brett Paufler

Utility Functions

text_iterator_eml()
    sequentially returns text utilizing
 
        get_raw_text()
            returns a simple email's raw textual content

        strip_text()
            strips header and footer from raw email texts 

'''

import email

from os import listdir
from os.path import join as path_join


TEST_EML = '.\\input\\test.eml'

def get_list_of_emails(dir_in = '.\\input\\'):
    '''Returns a list of email files
    in input directory'''
    list_of_emails = [path_join(dir_in, f) for
                 f in listdir(dir_in)
                 if f.endswith('.eml')]
    return list_of_emails

def get_raw_text(path_to_email):
    '''Returns an email's text.
    Presumes a simple text only email.'''
    
    msg = email.message_from_file(
        open(path_to_email))
    attachments = msg.get_payload()
    raw_email_text = str(attachments[0])
    return raw_email_text


def strip_raw_text(raw_email_text):
    '''Removes default headers and footers
    from raw_email_text    
    '''
    
    #Reverse Markup Encodings
    no_blanks = raw_email_text.replace('=20', '')
    no_returns = no_blanks.replace('=\n', '')
    unescaped_text = no_returns
    
    #Into a List
    line_items = unescaped_text.split('\n')
    
    #Removes Headers, Footers, and Blank Items
    no_header = line_items[5:] #Strips Header
    no_footer = [i for i in no_header
                    if 'Love, Brett' not in i]
    no_blank_lines = [i for i in no_footer              
                     if i != '']
    
    #Re-Assemble into Text Block from Lines
    stripped_text = '\n'.join(no_blank_lines)
    return stripped_text

def text_iterator_eml():
    '''Sequentially yields text
    of all emails in ./input'''
    for next_email_path in get_list_of_emails():
        raw_text = get_raw_text(next_email_path)
        working_text = strip_raw_text(raw_text)
        yield working_text



if __name__ == '__main__':
    for text in text_iterator_eml():
        print text
    #print working_text
    #print working_text
    #print working_text