import xml.etree.ElementTree as ET
import json
import datetime
import sys
import re

import glob

# Parse Tellico's XML and get a library struct,
# a stripped version of our library in a Python-friendly format
def getLibrary(path, lastUpdate):
    namespace = {'tellico': 'http://periapsis.org/tellico/' }

    xml = ET.parse(path)
    root = xml.getroot()

    collection = root.find('tellico:collection', namespace)

    library = dict()
    library['lastupdate'] = lastUpdate
    library['books'] = list()

    for i in collection.findall('tellico:entry', namespace):
        newbook = dict()
        newbook['id'] = int(i.attrib['id'])
        # these `for` overwrite previous values,
        # but it is not an issue since actually these are one shot only elements
        # actually there is no 1to1 conversion between XML and JSON, so this operation
        # can not be made automagically without doing some preliminary assumptions
        # (Possibly useful module: https://github.com/martinblech/xmltodict)
        for j in i.iterfind('tellico:title', namespace):
            newbook['title'] = j.text
        for j in i.iterfind('tellico:publisher', namespace):
            newbook['publisher'] = j.text
        for j in i.iterfind('tellico:pub_year', namespace):
            match = re.search('[0-9]{4}', j.text)
            newbook['year'] = int(match.group())
        for j in i.iterfind('tellico:isbn', namespace):
            newbook['isbn'] = j.text.replace('-', '')
        for j in i.iterfind('tellico:pages', namespace):
            newbook['pages'] = int(j.text)
        for j in i.iterfind('tellico:cover', namespace):
            newbook['cover'] = j.text
        newbook['authors'] = list()
        for j in i.iterfind('tellico:authors', namespace):
            for k in j.findall('tellico:author', namespace):
                newbook['authors'].append(k.text)

        library['books'].append(newbook)

    return library

# Filter results using following filter functions and order by title
####################################################################
def filter(library, title='', author=''):
    resultBookList = list()

    for i in library['books']:
        if filterTitle(i, title) and filterAuthor(i, author):
            resultBookList.append(i)

    sortedResultBookList = sorted(resultBookList, key=lambda k: k.get('title', ''))

    result = dict()
    result['lastupdate'] = library['lastupdate']
    result['books'] = sortedResultBookList

    return result

# Filter by title
def filterTitle(book, filter):
    return filter.lower() in book['title'].lower()

# Filter by author
def filterAuthor(book, filter):
    for i in book['authors']:
        if filter.lower() in i.lower():
            return True
    return False