#!/usr/bin/python3
# -*- coding: UTF-8 -*-

# GET me using a web browser,
# executing my code with a Python interpreter called by a CGI-compliant webserver!
# Example URI:
#   http://www.example.org/path/main.py?title=title&author=author
# where:
#   title:
#       title of the book to filter (optional)
#   author:
#       author of the book to filter (optional)
#
#   Every parameter is optional.
#   Please note that not providing filters results in all books in the library.

# Useful libraries (no pun intended)
import xml.etree.ElementTree as ET
import json
import sys
import cgitb, cgi
import zipfile
import shutil as sh
import os
import time

# Our custom library (again no pun intended)
import tcparser

import glob

# Start CGI handling for webserver
cgitb.enable()
inputvars = cgi.FieldStorage()

print('Content-Type: text/json; charset=utf-8')
print('Access-Control-Allow-Origin: *')
print()
### End of HTTP headers:  it is now safe to output things
##########################################################

# Create output directory and temporary files if they do not exist
if not os.path.exists(glob.conf['default']['outdir']):
    os.mkdir(glob.conf['default']['outdir'])
if not os.path.exists(glob.conf['default']['outdir'] + '/lastupdate.txt'):
    luh = open(glob.conf['default']['outdir'] + '/lastupdate.txt', 'w')
    luh.write('0')
    luh.close()

# Retrieve last database update timestamp
luh = open(glob.conf['default']['outdir'] + '/lastupdate.txt', 'r')
lu = int(float(luh.read()))
luh.close()

mtime = os.path.getmtime(glob.conf['default']['path'])

if int(lu) < int(mtime):
    # Unzip Tellico .tc database
    zipHandler = zipfile.ZipFile(glob.conf['default']['path'], 'r')
    zipHandler.extractall(glob.conf['default']['outdir'])
    zipHandler.close()
    luh = open(glob.conf['default']['outdir'] + '/lastupdate.txt', 'w')
    luh.write(str(time.time()))
    luh.close()

# Get a Python-friendly library struct from XML file
library = tcparser.getLibrary(glob.conf['default']['outdir'] + "/tellico.xml", lu)

### Get filters to search for books ###
try:
    title = inputvars['title'].value
except KeyError:
    title = ''

try:
    author = inputvars['author'].value
except KeyError:
    author = ''


result = tcparser.filter(library, title=title, author=author)

# Wanna get a pretty JSON encoded library to do your nasty things offline at home? ;-)
print(json.dumps(result, indent=4))