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 werkzeug.utils import cached_property
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="."
    def __init__(self,app=None,name=None):
        self.default_template="page.html"
        super(FlatPagesIndex, self).__init__(app=app, name=name)

    @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))

    def get_pages(self, paths):
        "get pages for a list of paths"
        if paths is None:
            raise AttributeError("paths for get_pages can't be None")
        return (self.get(p) for p in paths)

        
    @staticmethod
    def get_paths(pages):
        return (p.path for p in pages)

    def __iter__(self):
        return (FlatPagesIndex.page_defaults(p,"",False) for p in super(self.__class__,self).__iter__())
    @cached_property
    def _pages(self):
        d=super(FlatPagesIndex,self)._pages
        for path in d:
            d[path]=FlatPagesIndex.page_defaults(d[path],"")
        return d
    

    def page_defaults(self, page, dirpath, is_index=False):
        is_index = (page.path.split('/')[-1]=='index')
        page.meta["is_index"]=is_index
        dirpath='/'.join(path.split('/')[0:-1]) # remove index from path
        page.meta["dirpath"]=dirpath
        if is_index:
            page.meta["title"]=page.meta.get("title", dirpath.split('/')[-1])
        else:
            page.meta["title"]=page.meta.get("title", page.path.split('/')[-1])
            page.meta["template"]=page.meta.get("template", self.default_template)
        return page


    
    @staticmethod
    def is_subpage(path,root,page_root=""):
        return (path.startswith(root) and  # is a subpage
                path_depth(path)<path_depth(root)+2 and   # only one level 
                ( page_root != path)
        )
    
    @staticmethod
    def is_index_path(path):
        return not ( re.match('.*index',path) is None)

    def get_sub_pages(self, dirpath,page_path=""):
        return (p for p in self
               if  FlatPagesIndex.is_subpage(str(p.path),dirpath, page_path)
                and not FlatPagesIndex.is_index_path(p.path)
        )
    
    # List all index subpages of the current page i.e. all pages in subdirectories
    def get_sub_ipages(self, page ):
        dirpath=page.meta["dirpath"]
        page_path=page.path
        return (p for p in self
                if FlatPagesIndex.is_subpage(str(p.path), dirpath, page_path)
                and FlatPagesIndex.is_index_path(p.path)
        )
 
    def __getitem__(self,key):
        self.get(key)
        
    # load a page from a path information
    def get(self,path):
        if path == '': path='index'
        page = super(FlatPagesIndex,self).get(self,path) # try to load index page
        if page ==None:
            path=pjoin(path,"index")
            page = super(FlatPagesIndex,self).get(self,path) # try to load index page
        return  page

    def load_linklists_for_templates(self, page_path, dirpath,
                                     is_index=True, cfg={},
                                     page_url_for=partial(url_for,'intern.postjson')):
        abspath = pjoin(FlatPagesIndex.FLATPAGES_ROOT,dirpath)
        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(abspath), page_url_for)
        if is_index == True:
            ld,sp,spi=(file_to_link(list_dir_md(abspath), partial(url_for,'intern.post')),
                       page_to_link(self.get_sub_pages(dirpath,page_path), page_url_for),
                       page_to_link(self.get_sub_ipages(dirpath,page_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