# -*- coding: UTF-8 -*-
'''
rtx - RetroText
rtxPwage: Klasse zur Benutzung einer CEPT-Seite
by Anna Christina Naß <acn@acn.wtf>
released under GPL
'''

import os
import re
import config
import logging

class rtxPage:
    """ Klasse zur Benutzung einer CEPT-Seite
    """

    die_seite = ""
    seiten_nummer = -1
    link_liste = {}

    def __init__(self, page = None):
        """ create a new page object for the page 'page' 
        returns False if the page cannot be found
        returns True if the page has been loaded
        """
        if page == None:
            return
        else:
            self.die_seite = ""
            self.seiten_nummer = -1
            self.link_liste = {}
            self._load_page(page)

    @staticmethod
    def exists(page):
        """ checks if the page (i.e. the file) exists """
        for path in config.PAGES:
            if os.path.isfile(path + page) or os.path.isfile(path + page + ".cept"):
              return True
        return False

    def get_page(self):
        """ returns the page if loaded 
        returns False if no page has been loaded
        """
        if self.die_seite != "":
            return self.die_seite
        else:
            return False

    def set_page(self,pagedata):
        """ write the pagedata as the new page and (probably) the link list """
        self.die_seite = pagedata
        self.link_liste = self._get_link_list()

    def get_links(self):
        """ returns the list of links found in this page """
        return self.link_liste

    def get_link(self, link):
        """ returns the target for a given link
        returns False if this link does not exist 
        """
        if link in self.link_liste:
            return self.link_liste[link]
        else:
            return False

    def get_page_id(self):
        """ returns the id of the current page """
        return self.seiten_nummer

    def _load_page(self, page):
        """ Load a CEPT page from the file system 
        returns False if the page cannot be found
        returns True if the page has been loaded
        """
        for path in config.PAGES:
            if os.path.isfile(path + page):
                filename = path + page
                """ page has been found, now exit the for loop """
                break
            if os.path.isfile(path + page + ".cept"):
                filename = path + page + ".cept"
                """ page has been found - with .cept extension """
                break
        else:
            """ page does not exist anywhere, so exit the function """
            return False
        
        with open(filename, "rb") as f:
            self.die_seite = f.read()
        self.seiten_nummer = page
        self.link_liste = self._get_link_list()
        return True

    def _get_link_list(self):
        """ private function which parses the CEPT page and extracts the link list
        returns True if links have been found
        returns False if no links have been found
        """
        links = []
        links = re.findall("\x1f\x3d([^\x1f\x9b\x1b]+)", str(self.die_seite, "latin-1"))
        liste = {}

        for item in links:
            if item[0] != "0":
                link = item[1:3].strip()
                target = item[3:].strip()
                liste[link] = target

        logging.info(liste)

        return liste