from flask_flatpages import FlatPages, pygments_style_defs
import flask_flatpages
from flask import url_for
import re
from utils import path_depth,pjoin2,pjoin,list_dir, page_to_link, file_to_link
from functools import partial

from collections import namedtuple

FileLists=namedtuple("FileLists", ["list_files", "list_images", "sub_pages", "sub_index_pages", "breadcrumbs"])



# List all non *.md files within the directory
list_dir_md=partial(list_dir, not_ext=["md","~"])

# List all jpg images within the directory
list_dir_img=partial(list_dir, ext=["jpg", "jpeg","JPG"])


class FlatPagesIndex(FlatPages):
    FLATPAGES_ROOT="."
    @staticmethod
    def get_breadcrumb_paths(path):
        """
        breadcrumbs decompose the path
        a/b/index -> [a/index a/b/index]
        """
        elements = path.split('/')
        print "i: %s" % elements

        elements2 = ['index']
        if len(elements)>2:
            for i in range(1,len(elements)):
                print "i: %s" % elements[0:i]
                elements2.append(pjoin2(elements[0:i])+u'/index')
        return elements2
   

    def breadcrumbs(self, page):
        "Parse a path or the path of a page into breadcrumbs"
        if type(page) is flask_flatpages.Page:
            return self.get_pages( FlatPagesIndex.get_breadcrumb_paths(page.path))
        else:
            return self.get_pages(FlatPagesIndex.get_breadcrumb_paths(page))

    @staticmethod
    def get_paths(pages):
        return (p.path for p in pages)
 
    def get_pages(self, paths):
        if paths is None:
            raise AttributeError("paths for get_pages can't be None")
        return (self.get(p) for p in paths)

    def get_sub_pages(self, path):
        def is_subpage(path, root):
            return (path.startswith(root) and  # is a subpage
                ( re.match('.*index',path) is None) and # is no index
                path_depth(path)<path_depth(root)+2
            )
        return (p for p in self
               if  is_subpage(str(p.path),path))
    
    # List all index subpages of the current page i.e. all pages in subdirectories
    def get_sub_ipages(self, path):
        cc=path_depth(path)
        ppath="index" if path=="" else pjoin2([path,"index"])
        ps=(p for p in self
            if (p.path.startswith(path) and # subpages of this page
                not ( re.match('.*index',p.path) is None) and # only index
                ( ppath != p.path) and # not identical page
                len(p.path.split('/'))<=cc+2) ) # only one level
        return ps 


    # load a page from a path information
    def get_flatpage(self,path):
        is_index = path=='' or path.split('/')[-1]=='index'
        if path == 'index' or path=='': 
            is_index=True
            path=''
            pathi='index'
        else:
            if path.split('/')[-1]=='index': # last element is "index" ?
                is_index=True
                path='/'.join(path.split('/')[0:-1]) # remove index from path
            pathi = u'{}/{}'.format(path, 'index') # try to add index to the path
        page = FlatPages.get(self,pathi) # try to load index page
        if not page is None: # if successful it is a index
            is_index=True
        else: 
            page=FlatPages.get(self,path)
        return (is_index, path, page) 

    

    def load_linklists_for_templates(self,page_path, rel_path, is_index=True, cfg={}, page_url_for=partial(url_for,'intern.postjson')):
        abspath = pjoin(FlatPagesIndex.FLATPAGES_ROOT,rel_path)
  #      if not is_index:
        dirpath= pjoin(FlatPagesIndex.FLATPAGES_ROOT,"/".join(page_path.split('/')[:-1]))

        bc =  page_to_link( self.breadcrumbs(page_path), page_url_for)
        il=[]
        if (cfg.get("has_img",False) ):
            il=file_to_link(list_dir_img(dirpath), page_url_for)
        if is_index == True:
            ld,sp,spi=(file_to_link(list_dir_md(abspath),page_url_for),
                       page_to_link(self.get_sub_pages(rel_path),page_url_for),
                       page_to_link(self.get_sub_ipages(rel_path),page_url_for))
        else:
            ld,sp,spi=([],[],[])

        fl=FileLists(list_files=ld, list_images=il, sub_pages=sp, sub_index_pages=spi, breadcrumbs=bc)
        return fl



    def load_lists_for_templates(self,path,is_index=True, cfg={}):
        path2 = pjoin(FlatPagesIndex.FLATPAGES_ROOT,path)
        if not is_index:
            path="/".join(path2.split('/')[:-1])
          
        # List all subpages of the current page 
        #    get_sub_pages =  partial(FlatPagesIndex.get_sub_pages, self)
        #    get_sub_ipages =  partial(FlatPagesIndex.get_sub_ipages, self)
        bc= self.breadcrumbs(path)
        il=[]
        if (cfg.get("has_img",False) ):
            print "path2: %s" % path2
            il=list_dir_img(mpath)
        if is_index == True:
            ld=list_dir_md(path2)
            sp=self.get_sub_pages(path)
            spi=self.get_sub_ipages(path)
        else:
            ld=[]
            sp=[]
            spi=[]

        fl=FileLists(list_files=ld, list_images=il, sub_pages=sp, sub_index_pages=spi, breadcrumbs=bc)
        return fl