import os
import re
import cherrypy
import stat
import zipfile
from lib.rarfile import rarfile

import mylar

try:
    from PIL import Image
except ImportError:
    logger.debug("WebReader Requested, but PIL or pillow libraries must be installed. Please execute 'pip install pillow', then restart Mylar.")
    return serve_template(templatename="index.html", title="Home", comics=comics, alphaindex=mylar.CONFIG.ALPHAINDEX)
    
from mylar import logger, db, importer, mb, search, filechecker, helpers, updater, parseit, weeklypull, librarysync, moveit, Failed, readinglist, config
from mylar.webserve import serve_template

class WebViewer(object):

    def __init__(self):
        self.ish_id = None
        self.page_num = None
        self.kwargs = None
        self.data = None
        
        if not os.path.exists(os.path.join(mylar.DATA_DIR, 'sessions')):                            
            os.makedirs(os.path.abspath(os.path.join(mylar.DATA_DIR, 'sessions')))   
  
        updatecherrypyconf = {
            'tools.gzip.on': True,
            'tools.gzip.mime_types': ['text/*', 'application/*', 'image/*'],
            'tools.sessions.timeout': 1440,
            'tools.sessions.storage_class': cherrypy.lib.sessions.FileSession,
            'tools.sessions.storage_path': os.path.join(mylar.DATA_DIR, "sessions"),
            'request.show_tracebacks': False,
            'engine.timeout_monitor.on': False,
        }    
        if mylar.CONFIG.HTTP_PASSWORD is None:
            updatecherrypyconf.update({
                'tools.sessions.on': True,
            })

        cherrypy.config.update(updatecherrypyconf)
        cherrypy.engine.signals.subscribe()
        
    def read_comic(self, ish_id = None, page_num = None, size = None):
        logger.debug("WebReader Requested, looking for ish_id %s and page_num %s" % (ish_id, page_num))
        if size == None:
            user_size_pref = 'wide'
        else:
            user_size_pref = size
            
        try:
            ish_id
        except:
            logger.warn("WebReader: ish_id not set!")

        myDB = db.DBConnection()
        comic = myDB.selectone('select comics.ComicLocation, issues.Location from comics, issues where comics.comicid = issues.comicid and issues.issueid = ?' , [ish_id]).fetchone()
        if comic is None:
            logger.warn("WebReader: ish_id %s requested but not in the database!" % ish_id)
            raise cherrypy.HTTPRedirect("home")
#        cherrypy.config.update()
        comic_path = os.path.join(comic['ComicLocation'], comic['Location'])
        logger.debug("WebReader found ish_id %s at %s" % (ish_id, comic_path))

#        cherrypy.session['ish_id'].load()
#        if 'sizepref' not in cherrypy.session:
#            cherrypy.session['sizepref'] = user_size_pref
#        user_size_pref = cherrypy.session['sizepref']
#        logger.debug("WebReader setting user_size_pref to %s" % user_size_pref)
        
        scanner = ComicScanner()
        image_list = scanner.reading_images(ish_id)
        logger.debug("Image list contains %s pages" % (len(image_list)))
        if len(image_list) == 0:
            logger.debug("Unpacking ish_id %s from comic_path %s" % (ish_id, comic_path))
            scanner.user_unpack_comic(ish_id, comic_path)
        else:
            logger.debug("ish_id %s already unpacked." % ish_id)

        num_pages = len(image_list)
        logger.debug("Found %s pages for ish_id %s from comic_path %s" % (num_pages, ish_id, comic_path))
        
        if num_pages == 0:
            image_list = ['images/skipped_icon.png']

        cookie_comic = re.sub(r'\W+', '', comic_path)
        cookie_comic    = "wv_" + cookie_comic.decode('unicode_escape')
        logger.debug("about to drop a cookie for " + cookie_comic + " which represents " + comic_path)
        cookie_check = cherrypy.request.cookie
        if cookie_comic not in cookie_check:
            logger.debug("Cookie Creation")
            cookie_path = '/'
            cookie_maxage = '2419200'
            cookie_set = cherrypy.response.cookie
            cookie_set['cookie_comic'] = 0
            cookie_set['cookie_comic']['path'] = cookie_path.decode('unicode_escape')
            cookie_set['cookie_comic']['max-age'] = cookie_maxage.decode('unicode_escape')
            next_page = page_num + 1
            prev_page = page_num - 1
        else:
            logger.debug("Cookie Read")
            page_num = int(cherrypy.request.cookie['cookie_comic'].value)
            logger.debug("Cookie Set To %d" % page_num)
            next_page = page_num + 1
            prev_page = page_num - 1

        logger.info("Reader Served")
        logger.debug("Serving comic " + comic['Location'] + " page number " + str(page_num))

        return serve_template(templatename="read.html", pages=image_list, current_page=page_num, np=next_page, pp=prev_page, nop=num_pages, size=user_size_pref, cc=cookie_comic, comicpath=comic_path, ish_id=ish_id)

    def up_size_pref(self, pref):
        cherrypy.session.load()
        cherrypy.session['sizepref'] = pref
        cherrypy.session.save()
        return

class ComicScanner(object):

    # This method will handle scanning the directories and returning a list of them all.
    def dir_scan(self):
        logger.debug("Dir Scan Requested")
        full_paths = []
        full_paths.append(mylar.CONFIG.DESTINATION_DIR)
        for root, dirs, files in os.walk(mylar.CONFIG.DESTINATION_DIR):
            full_paths.extend(os.path.join(root, d) for d in dirs)

        logger.info("Dir Scan Completed")
        logger.info("%i Dirs Found" % (len(full_paths)))
        return full_paths

    def user_unpack_comic(self, ish_id, comic_path):
        logger.info("%s unpack requested" % comic_path)
        for root, dirs, files in os.walk(os.path.join(mylar.CONFIG.CACHE_DIR, "webviewer", ish_id), topdown=False):
            for f in files:
                os.chmod(os.path.join(root, f), stat.S_IRWXU | stat.S_IRWXG | stat.S_IRWXO)  # 0777
                os.remove(os.path.join(root, f))
        for root, dirs, files in os.walk(os.path.join(mylar.CONFIG.CACHE_DIR, "webviewer", ish_id), topdown=False):
            for d in dirs:
                os.chmod(os.path.join(root, d), stat.S_IRWXU | stat.S_IRWXG | stat.S_IRWXO)  # 0777
                os.rmdir(os.path.join(root, d))
        if comic_path.endswith(".cbr"):
            opened_rar = rarfile.RarFile(comic_path)
            opened_rar.extractall(os.path.join(mylar.CONFIG.CACHE_DIR, "webviewer", ish_id))
        elif comic_path.endswith(".cbz"):
            opened_zip = zipfile.ZipFile(comic_path)
            opened_zip.extractall(os.path.join(mylar.CONFIG.CACHE_DIR, "webviewer", ish_id))
        return

    # This method will return a list of .jpg files in their numberical order to be fed into the reading view.
    def reading_images(self, ish_id):
        logger.debug("Image List Requested")
        image_list = []
        image_src = os.path.join(mylar.CONFIG.CACHE_DIR, "webviewer", ish_id)
        image_loc = os.path.join(mylar.CONFIG.HTTP_ROOT, 'cache', "webviewer", ish_id)
        for root, dirs, files in os.walk(image_src):
            for f in files:
                if f.endswith((".png", ".gif", ".bmp", ".dib", ".jpg", ".jpeg", ".jpe", ".jif", ".jfif", ".jfi", ".tiff", ".tif")):
                    image_list.append( os.path.join(image_loc, f) )
                    image_list.sort()
        logger.debug("Image List Created")
        return image_list