# /bin/python
# -*- coding:utf-8 -*-
import time
import sys
import requests
from bs4 import BeautifulSoup
from mail import sendmail

__author__ = 'xy'

# 主類
class FUCK():
 def __init__(self, username, password, seatNO, mailto):
 """
  以四個參數初始化，用戶名，密碼，要預約的座位號，接受預約結果提醒郵件的郵箱
 """
  self.username = username
  self.password = password
  self.seatNO = seatNO
  self.mailto = mailto
  self.base_url = 'http://yuyue.juneberry.cn'
  self.login_url = 'http://yuyue.juneberry.cn'
  self.order_url = self._get_order_url()

  self.login_content = ''
  self.middle_content = ''
  self.final_content = ''

  self.s = requests.session() # 創建可傳遞cookies的會話

  # post data for login
  self.data1 = {
   'subCmd': 'Login',
   'txt_LoginID': self.username, # S+學號
   'txt_Password': self.password, # 密碼
   'selSchool': 60, # 60表示北京交通大學
  }

  # post data for order a seat
  self.data2 = {
   'subCmd': 'query',
  }

  # 自定義http頭，然而我在程序里并沒有使用
  self.headers = {
   'Connection': 'keep-alive',
   'Content-Type': 'application/x-www-form-urlencoded',
  }

  self.login()
  self.run()
  self._is_success(self.final_content)

  # 懷疑程序出錯時，取消下行注釋，可打印一些參數
  # self._debug()

 def _get_date_str(self):
  s = time.localtime(time.time())
  ########333
  date_str = str(s.tm_year) + '%2f' + str(s.tm_mon) + '%2f' + str(s.tm_mday + 1)
  date_str = date_str.replace('%2f1%2f32', '%2f2%2f1') \
   .replace('%2f2%2f29', '%2f3%2f1') \
   .replace('%2f3%2f32', '%2f4%2f1') \
   .replace('%2f4%2f31', '%2f5%2f1') \
   .replace('%2f5%2f32', '%2f6%2f1') \
   .replace('%2f6%2f31', '%2f7%2f1') \
   .replace('%2f7%2f32', '%2f8%2f1') \
   .replace('%2f8%2f32', '%2f9%2f1') \
   .replace('%2f9%2f31', '%2f10%2f1') \
   .replace('%2f10%2f32', '%2f11%2f1') \
   .replace('%2f11%2f31', '%2f12%2f1') \
   .replace('%2f12%2f32', '%2f1%2f1')
  return date_str

 def _get_order_url(self):
  return "http://yuyue.juneberry.cn/BookSeat/BookSeatMessage.aspx?seatNo=101001" + self.seatNO + "&seatShortNo=01" + self.seatNO + "&roomNo=101001&date=" + self._get_date_str()

 def _get_static_post_attr(self, page_content, data_dict):
  """
  拿到<input type='hidden'>的post參數，并添加到post_data中
  """
  soup = BeautifulSoup(page_content, "html.parser")
  for each in soup.find_all('input'):
   if 'value' in each.attrs and 'name' in each.attrs:
    data_dict[each['name']] = each['value'] # 添加到login的post_data中
    # self.data2[each['name']] = each['value'] # 添加到order的post_data中
  return data_dict

 def _debug(self):

  print self.order_url
  print self.data1
  print self.data2
  print self.headers
  print self.s.cookies

  # print self.login_content
  # print self.middle_content
  print self.final_content

 def login(self):
  homepage_content = self.s.get(self.base_url).content
  self.data1 = self._get_static_post_attr(homepage_content, self.data1)
  r = self.s.post(self.login_url, self.data1)
  self.login_content = r.content

 def run(self):

  # 這個get的意思是：原先的cookie沒有預約權限，
  # 訪問這個get之后，會使cookie擁有預約權限，從而執行下一個post
  self.middle_content = self.s.get('http://yuyue.juneberry.cn/BookSeat/BookSeatListForm.aspx').content

  # 經測試，這個post只需要一個subCmd的參數就可以正常返回，因此不必根據get內容更新post參數
  # self.data2 = self._get_static_post_attr(middle_content, self.data2)

  # 這個post請求完成了預約功能！
  r = self.s.post(self.order_url, self.data2)

  self.final_content = r.content

 def _is_success(self, text):
  """
  接受最終的html內容，判斷是否成功，并觸發日志記錄和郵件提醒
  """
  if '<h6 id="MessageTip">已經存在有效的預約記錄。</h6>' in text:
   self.clear_error_once('[done!] You already ordered a seat!')
  elif '<h6 id="MessageTip">選擇的日期不允許預約。</h6>' in text:
   self.clear_error_once('[done!] Date is wrong!')
  elif '<h6 id="MessageTip">所選座位已經被預約。</h6>' in text:
   self.clear_error_once('[done!] This seat is not available, maybe taken by others!')
  elif '<h6 id="MessageTip">座位預約成功' in text:
   self.clear_error_once('[done!] Success! An email is sending to you!')
   sendmail.send_mail('BJTU Library Seat_NO:' + self.seatNO + 'ordered!',
        'Sending by robot. Do not reply this mail!', self.mailto)
  else:
   self.error_log_once('Error! 302 to login page')

 def error_log_once(self, text='default error (once)'):
  try:
   is_error_file = open('./isopen_xy.txt', 'r')
  except:
   is_error_file = open('./isopen_xy.txt', 'w')
  if '1' not in is_error_file.read():
   print 'writting error to log...'
   self.error_log(text)
  else:
   print 'already written to log'
  is_error_file.close()
  sendmail.send_mail('BJTU_Library system error once !', 'error text!')

 def error_log(self, text='default error'):
  is_error_file = open('./isopen_xy.txt', 'w')
  is_error_file.write('1\n')
  is_error_file.close()

  f = open("./log_xy.txt", 'a')
  f.write(time.strftime("%Y-%m-%d %X", time.localtime()) + text + '\n')
  f.close()

 def clear_error_once(self, text='success'):
  print text
  is_error_file = open('./isopen_xy.txt', 'w')
  is_error_file.write('0\n')
  is_error_file.close()


if __name__ == '__main__':
 if len(sys.argv) < 5:
  print 'Usage: python library.py [username] [password] [seat_NO] [email]'
  print 'eg. python library.py S13280001 123456 003 XXXX@qq.com\n'
  print 'Any problems, mail to: i[at]cdxy.me'
  print '#-*- Edit by cdxy 16.03.24 -*-'
  sys.exit(0)
 else:
  FUCK(sys.argv[1], sys.argv[2], sys.argv[3], sys.argv[4])