import csv
import sys
import os
import tkinter as tk
from tkinter import messagebox
import hashlib
import pickle
import filters.ieeeFilter as IEEE, filters.scopusFilter as Scopus, filters.webScienceFilter as WebOfScience
# titulo, abstract, autores, arquivo&linha, DOI, palavras-chave,palavras-chave extras

FINAL_CSV_HEADERS = ['titulo', 'abstract', 'autores', 'doi', 'keywords','extra_keywords', 'fonte']

def loadFiles (files):
  loadedFiles = []
  for file in files:
    loadedFiles.append((csv.DictReader(open(file['path']), delimiter=file['separator']), file))
  return loadedFiles

def saveAcceptedCSV (data):
  file = open('./accepted.csv', mode='w')
  headers = data['header']
  writer = csv.writer(file, delimiter=',')
  writer.writerow(headers)
  data.pop('header')
  for row in data.values():
    writer.writerow(row)
  file.flush()
  file.close()

def saveRejectedCSV (data):
  file = open('./rejected.csv', mode='w')
  headers = data['header']
  writer = csv.writer(file, delimiter=',')
  writer.writerow(headers)
  data.pop('header')
  for row in data.values():
    writer.writerow(row)
  file.flush()
  file.close()

def writeFinalLog (data):
  file = open("./log.txt", mode='w')
  file.write("accepted: {0}\nrejected: {1}\nduplicated: {2}\n".format(data['accepted'],data['rejected'],data['duplicate']))
  file.flush()
  file.close()

def removeStateFile ():
  try:
    os.remove('./.csvstate')
  except Exception:
    pass

def saveState (data):
  file = open('./.csvstate', mode='wb')
  pickle.dump(data, file)
  file.close()

def loadState (root):
  try:
    file = open('./.csvstate', mode='rb')
    answer = tk.messagebox.askyesno("State lading","Load last session state?")
    if answer:
      data = pickle.load(file)
      file.close()
      return data
  except Exception:
    pass
  return {'file_index':0, 'row_index':0, 'accepted':0, 'rejected':0, 'duplicate': 0}

def loadConfigFile ():
  files = list()
  try:
    file = open('./csvconfig.txt')
    rawData = file.read()
    lines = rawData.split('\n')
    for line in lines:
      parameters = line.split(':')
      separator = parameters[2].encode('utf-8').decode("unicode_escape")
      fileConfig = {'path': parameters[0], 'filter': parameters[1], 'separator': separator}
      files.append(fileConfig)
    file.close()
    return files
  except FileNotFoundError:
    return list()

def getFilter (file):
  if file['filter'] == 'ieee':
    return IEEE.IEEEFilter()
  elif file['filter'] == 'scopus':
    return Scopus.ScopusFilter()
  elif file['filter'] == 'webscience':
    return WebOfScience.WebScience()
  else:
    raise Exception('Undefined filter '+file['filter'])

def restoreAcceptedCSV ():
  try:
    file = open('./accepted.csv')
    rows = list(csv.reader(file))
    data = {}
    if len(rows) == 0:
      return data
    data['header'] = rows[0]
    for i in range(1,len(rows)):
      digest = hashlib.sha256(str.encode(rows[i][0])).hexdigest()
      data[digest] = rows[i]
    return data
  except FileNotFoundError:
    return {}

def restoreRejectedCSV ():
  try:
    file = open('./rejected.csv')
    rows = list(csv.reader(file))
    data = {}
    if len(rows) == 0:
      return data
    data['header'] = rows[0]
    for i in range(1,len(rows)):
      digest = hashlib.sha256(str.encode(rows[i][0])).hexdigest()
      data[digest] = rows[i]
    return data
  except FileNotFoundError:
    return {}