from django.template import Template, RequestContext
from django.http import HttpResponse, Http404
from django.conf import settings
from django.shortcuts import render

from os import path

def articleVars(fn):
    file, url = file_for_url(fn)
    vars = {}
    with open(file, 'r') as f:
        l = f.readline().strip()
        while l:
            ll = l.split(':', 1)
            h = ll[0].strip()
            if len(ll) > 1:
                v = ll[1].strip()
            else:
                v = ""
            vars[h.lower()] = v
            l = f.readline().strip()
        return vars

def loadArticle(request, url, f):
    vars = {'url': url}
    l = f.readline().strip()
    while l:
        ll = l.split(':', 1)
        h = ll[0].strip()
        if len(ll) > 1:
            v = ll[1].strip()
        else:
            v = ""
        if h.lower() == "display":
            return showarticle(request, v)
        vars[h.lower()] = v
        l = f.readline().strip()
    vars['article_text'] = f.read()
    if vars.get('previousfile'):
        f = vars['previousfile']
        print(f)
        vars['previous_url'] = '/' + f
        prev = articleVars(f)
        vars['previous_article'] = prev.get('title', '')
    if vars.get('nextfile'):
        f = vars['nextfile']
        vars['next_url'] = '/' + f
        nxt = articleVars(f)
        vars['next_article'] = nxt.get('title', '')
    return render(request, 'article.html', vars)

def file_for_url(file):
    if file.startswith('/'):
        file = file[1:]
    full_path = path.join(settings.DOC_ROOT, file)
    if not path.exists(full_path):
        raise Http404
    if path.isdir(full_path):
        full_path = path.join(full_path, 'index')
    return full_path, '/' + file
    

def showarticle(request, file):
    full_path, url = file_for_url(file)
    with open(full_path, 'r') as f:
        return loadArticle(request, url, f)