from flask import render_template, request, jsonify
from www import app
import json, logging, os, glob
from lxml import etree as et
import config

def list_all(d, ext):

	if not os.path.isdir(d):
		logging.error(d + " is not a valid directory.")
		return None

	return [os.path.basename(f) for f in glob.glob(os.path.join(d, "*." + ext))]

def read_xml(d, fn):
	fp = os.path.join(d, fn)
	if not os.path.isfile(fp):
		return None

	root = et.parse(fp).getroot()
	xml_data = []
	for m in root.findall('mails/mail'):
		nbr_str = m.find('nbr').text
		date_str = m.find('date').text
		from_str = m.find('from').text
		subject_str = m.find('subject').text
		xml_data.append({'nbr': nbr_str, 'date': date_str, 'from': from_str, 'subject': subject_str})

	# sort
	xml_data[:] = sorted(xml_data, key=lambda x: parse_nbr_xml(x['nbr']))
	return xml_data


def parse_nbr_xml(nbr_str):
	if '-' in nbr_str:
		nbr_str = nbr_str.split('-')[0]
	# split number and return a tuple
	# ex. 15.4 -> (15, 4)
	tok = nbr_str.split('.')
	tup = (int(tok[0]), int(tok[1]))
	return tup

def update_nbr_xml(d, fn, nbr, new_nbr, date):
	fp = os.path.join(d, fn)
	if not os.path.isfile(fp):
		return False

	tr = et.parse(fp)
	m = tr.xpath(".//nbr[text()='" + nbr + "']")

	if m is None:
		return False

	mm = None
	for k in m:
		if k.getparent().find('date').text == date:
			mm = k
			break

	if mm is None:
		return False

	# replace nbr
	mm.text = new_nbr

	# order all mails according to their nbr
	mails = tr.find('mails')
	mails[:] = sorted(mails, key=lambda x: parse_nbr_xml(x.find('nbr').text))

	tr.write(fp)
	return True


def delete_nbr_xml(d, fn, nbr, date):
	fp = os.path.join(d, fn)
	if not os.path.isfile(fp):
		return False

	tr = et.parse(fp)
	m = tr.xpath(".//nbr[text()='" + nbr + "']")

	if m is None:
		return False

	mm = None
	for k in m:
		if k.getparent().find('date').text == date:
			mm = k
			break

	if mm is None:
		return False

	mail = mm.getparent()
	mail.getparent().remove(mail)

	tr.write(fp)
	return True


@app.route('/')
def index():
	return render_template("index.html")

@app.route('/xml', methods = ['GET', 'POST'])
def xml():
	if request.method == 'GET':
		li = list_all(config.xml['path'], 'xml')
		li = sorted(li, key=lambda x: int(x.split('.')[0]))
		return render_template("xml_all.html", files=li)

@app.route('/xml/<path:fn>', methods = ['GET', 'POST'])
def xmlfn(fn):
	if request.method == 'GET':
		data = read_xml(config.xml['path'], fn)
		if data is not None:
			return render_template("xml.html", fn=fn, data=data)
		else:
			return "File: " + fn + "does not exist."
	elif request.method == 'POST':
		data = request.form		
		a = data.get('action')
		if a == "update":
			logging.info("POST UPDATE " + fn + " -- " + data.get('nbr') + " ++ " + data.get('new_nbr'))
			if update_nbr_xml(config.xml['path'], fn, data.get('nbr'), data.get('new_nbr'), data.get('date')):
				return "ok"
		elif a == "delete":
			logging.info("POST DELETE " + fn + " -- " + data.get('nbr'))
			if delete_nbr_xml(config.xml['path'], fn, data.get('nbr'), data.get('date')):
				return "ok"
		return "-"