"""
A wrapper around the requests library to retrieve and update various information
about a commander from inara.cz
"""

from bs4 import BeautifulSoup
import re
import requests_cache
from requests_cache.core import CachedSession

BASE_URL = "http://inara.cz/"
CMDR_URL = BASE_URL + 'cmdr/'

# Some fun exceptions to raise!
class ServerError(Exception):
  pass

class CredentialsError(Exception):
  pass

class LoggingInException(Exception):
  pass

class CmdrNotFoundException(Exception):
  pass


class InaraSession(CachedSession):
  def __init__(self, username, password):
    CachedSession.__init__(self,
                           cache_name='inara',
                           backend='memory',
                           expire_after=600.0,
                           old_data_on_error=True)

    self.username = username
    self.password = password
    self.inara_login()
    
  def inara_login(self):
    if (not self.username or not self.password):
      raise CredentialsError()

    data = {
      "loginid": self.username,
      "loginpass": self.password,
      "formact": "ENT_LOGIN",
      "location": "intro"
    }

    r = self.post(BASE_URL, data=data)
    r.raise_for_status()

  def _inara_is_logged_in(self, soup):
    logout_link = soup.find(href=re.compile('ENT_LOGOUT'))
    return logout_link is not None

  def update_credits(self, credits):
    soup = self.get_soup(CMDR_URL)
    if not self._inara_is_logged_in(soup):
      return False

    oass = int(soup.find(id='oassinput')['value'])
    data = {
      "location": "cmdr",
      "formact": "USER_CREDITS_SET",
      "playercredits": credits,
      "playercreditsassets": credits + oass,
      "oass": oass,
    }
    r = self.post(CMDR_URL, data=data)
    r.raise_for_status()
    return True

  def update_location(self, location):
    data = {
      'formact': 'USER_LOCATION_SET',
      'playercurloc': location
    }
    r = self.post(CMDR_URL, data=data)
    r.raise_for_status()

  def get_cmdr_info(wing_id=None, cmdr_id=None):
    result = {}

    if wing_id is not None and cmdr_id is not None:
      wing_soup = self.get_soup("%s/wing/%s" % (BASE_URL, wing_id))
      result['rank'] = _get_rank(wing_soup, cmdr_id)
      result['location'] = _get_location(wing_soup, cmdr_id)

    if cmdr_id is not None:
      cmdr_soup = self.get_soup("%s/cmdr/%s" % (BASE_URL, cmdr_id))
    else:
      cmdr_soup = self.get_soup(CMDR_URL)
      
    result['balance'] = _get_cmdr_balance(cmdr_soup)
    result['assets'] = _get_cmdr_assets(cmdr_soup)

    return result

  def get_soup(self, url):
    r = self.get(url)
    r.raise_for_status()
    soup = BeautifulSoup(r.text, 'html.parser')

    if not self._inara_is_logged_in(soup):
      self.inara_login()
      # invalidate the cache entry, since we only want logged-in data
      self.cache.delete_url(url)
      raise LoggingInException()

    return soup

  def _get_cmdr_row(soup, cmdr_id):
    link = soup.find(attrs={'class': 'subtable'}).find(
      href=re.compile('/cmdr/' + cmdr_id))

    for parent in link.parents:
      if parent.name == 'tr':
        return parent

    raise CmdrNotFoundException()

  def _get_rank(soup, cmdr_id):
    row = _get_cmdr_row(soup, cmdr_id)
    return row.td.img['title']

  def _get_location(soup, cmdr_id):
    row = _get_cmdr_row(soup, cmdr_id)
    
    location_link = row.find(href=re.compile('market'))
    if not location_link or len(location_link.contents) == 0:
      return "Unknown"
    else:
      return location_link.contents[0]

  def _get_cmdr_balance(soup):
    title_text = soup.find(text="Credit Balance")
    br = title_text.parent.next_sibling
    return br.contents[0]

  def _get_cmdr_assets(soup):
    title_text = soup.find(text="Overall assets")
    br = title_text.parent.next_sibling
    return br.contents[0]