import sys
from flask import Flask, render_template, send_from_directory
from flask_flatpages import FlatPages, pygments_style_defs
from flask_frozen import Freezer
from config import Config
import os
import re
from os.path import isfile, abspath
package_directory = os.path.dirname(os.path.abspath(__file__))

#cfg = Config(file('./config.cfg'))
cfg = Config(file(os.path.join(package_directory, 'config.cfg')))

FLATPAGES_AUTO_RELOAD = cfg.pages_reload
FLATPAGES_EXTENSION = '.md'
FLATPAGES_ROOT = abspath(cfg.pages_root)
FLATPAGES_FP_ROOT = abspath(cfg.pages_root)

app = Flask(__name__)
flatpages = FlatPages(app)
flatpages.get('index')
freezer = Freezer(app)
app.config.from_object(__name__)

def list_dir(mypath):
    return [f for f in os.listdir(mypath) if isfile(os.path.join(mypath, f)) and re.match('.*\.md.*',f) is None]
def get_sub_pages(path, page):
    ppath=page.path
    cc=len(path.split('/'))
    return [p for p in flatpages if p.path.startswith(path) and ( re.match('.*index',p.path) is None) and len(p.path.split('/'))<cc+2 ]


def get_sub_ipages(path, page):
    ppath=page.path
    cc=len(path.split('/'))
    if path=="":
        cc=0
    ps=[p for p in flatpages if p.path.startswith(path) and not ( re.match('.*index',p.path) is None) and  ( re.match(ppath,p.path) is None) and len(p.path.split('/'))<=cc+2 ]
    return ps 


def get_bc(path, page):
    ppath=page.path
    elements=path.split('/')#[0:-1]
    elements2=['index']
    for i in range(0,len(elements)):
        elements2.append(pjoin2(elements[0:i])+u'/index')
    ps=[p for p in flatpages if p.path in elements2 ]
    return ps 



def get_flatpage(path):
    is_index=False
    if path == 'index' or path=='':
        is_index=True
        path=''
        pathi='index'
    else:
        if path.split('/')[-1]=='index':
            is_index=True
            path='/'.join(path.split('/')[0:-1])
        pathi = u'{}/{}'.format(path, 'index')
    page = flatpages.get(pathi)
    if not page is None:
        is_index=True
    else:
        page=flatpages.get(path)
    return (is_index, path, page) 

def pjoin (rt,pth):
     return u'{}/{}'.format(rt,pth)

def pjoin2 (pth):
     return u'/'.join(pth) or u''

def misskey(a,key):
    if not a.has_key(key):
        return True
    return  a[key] is None

def page_defaults(page, is_index, path):
    if misskey(page.meta,"title"):
        page.meta["title"]=path.split('/')[-1]
    if misskey(page.meta, "template"):
        page.meta["template"]='post.html'
    return page
    

@app.route('/<path:name>/')
def post(name='index'):
    is_index, path, page = get_flatpage(name)
    app.logger.info('render'+name)
    path2 = pjoin(FLATPAGES_ROOT,path)
    
    if is_index == True and not page is None:
        ld=list_dir(path2)
        sp=get_sub_pages(path,page)
        spi=get_sub_ipages(path,page)
    else:
        ld=[]
        sp=[]
        spi=[]

    if not page is None:
        page_defaults(page,is_index,path)
        app.logger.info("Render Template"+page["template"] +"for "+path)
        return render_template(page.meta["template"], ld=ld, post=page, sp=sp, spi=spi, pth=path, pagebreadcrumbs=get_bc(path,page))
    
    if os.path.exists(u'{}/{}'.format(FLATPAGES_ROOT,path)):
        return send_from_directory(FLATPAGES_ROOT,path)
    else:
        return send_from_directory('static',path)