import os, os.path, stat, sys
import urllib, hashlib
from datetime import datetime
import pylog_config as cfg
import subprocess,tempfile
import markdown

from HTMLParser import HTMLParser

def dir_begin(path,hidden,depth):
    if depth!=0:
        print '<li>'
    print '<ul',
    if hidden:
        print 'class="hidden"',
    print'>'
def dir_end(path,hidden,depth):
    print '</ul>'
    if depth!=0:
        print '</li>'
def dir_link(name,f,depth,hidden):
    script = sys.argv[0][sys.argv[0].rindex('/')+1:]
    print '  <li class="link level'+str(depth),
    if hidden: 
        print ' hidden',
    print '">'
    print '    <a class="menulink" href="'+script+'?'+ urllib.urlencode({'path': os.path.normpath(f)}).replace('&','&amp;') +'">'+name+'</a>'
    print '  </li>'
def file_link(name,f,depth,hidden):
    script = sys.argv[0][sys.argv[0].rindex('/')+1:]
    print '  <li class="entry level'+str(depth),
    if hidden: 
        print ' hidden',
    print '">'
    print '    <a class="menulink" href="'+script+'?'+ urllib.urlencode({'path': os.path.normpath(os.path.dirname(f)), 'disp':os.path.normpath(f)}).replace('&','&amp;') +'">'+name+'</a>'
    print '  </li>'
            
def disp_txt(path):
    print '<div class="entrytext">'
    f = open(path)
    print markdown.markdown(f.read(),extensions=['math'])
    f.close()
    print '</div>'

class BodyParser(HTMLParser):
    body=False
    src=''
    blacklist = ['script']
    def handle_starttag(self, tag, attrs):
        if self.body and not(tag in self.blacklist):
            self.src+='<'+tag
            for attr in attrs:
                self.src+=' '+attr[0]+'="'+attr[1]+'"'
            self.src+='>'
        if tag=='body':
            self.body=True
    def handle_endtag(self, tag): 
        if tag=='body':
            self.body=False
        if self.body and not(tag in self.blacklist):
            self.src+='</'+tag+'>'
    def handle_data(self, data):
        if self.body:
            self.src+=data
    def handle_entityref(self,ref):
        self.handle_charref(ref)
    def handle_charref(self,ref):
        if self.body:
            self.src += '&'+ref+';'

def get_source_html(path):
    tmpdir = os.path.join(tempfile.gettempdir(),"pylog")
    cache=False
    if not os.path.exists(tmpdir):
        os.mkdir(tmpdir,0700)
        
    if os.path.exists(tmpdir):
        s=os.stat(tmpdir)
        if s.st_mode & stat.S_IRWXU == stat.S_IRWXU and \
          s.st_mode & stat.S_IRWXG == 0 and \
          s.st_mode & stat.S_IRWXO == 0 and \
          os.path.isdir(tmpdir):
            f=open(path,'r')
            tmpfile=os.path.join(tmpdir,hashlib.sha256(f.read()).hexdigest())
            f.close()
            cache=True
            
    if not cache:
        tmpfile=tempfile.mkstemp(prefix="pylog",dir=tmpdir)[1]
    
    if not cache or (cache and not os.path.exists(tmpfile)):
        #we use a fork of vim to generate a nice syntax highlighted html file
        #TODO this requires further testing
        p=subprocess.Popen(["/usr/bin/vim",path,\
            "-nEs",\
            "+syn on",\
            "+let html_no_progress=1",\
            "+let html_use_css=1",\
            "+let html_number_lines=1",\
            "+run! syntax/2html.vim",\
            "+w! "+tmpfile,\
            "+q!",\
            "+q!"],\
            stdout=subprocess.PIPE,stderr=subprocess.PIPE)
            
        p.stdout.close()
        p.stderr.close()
        p.wait() #wait for child to terminate
        
    f=open(tmpfile,"r")
    bp=BodyParser()
    bp.feed(f.read())
    src = bp.src
    f.close()   
    #delete tmp file but only if it's not a secure cached file
    if not cache:
        os.remove(tmpfile)
    return src
    
def disp_source(path):
    print '<div class="sourcecode">'
    print get_source_html(path)
    #print source
    print '</div>'

def disp(path):
    print '<div class="entrytext">'
    f = open(path)
    print f.read()
    f.close()
    print '</div>'

def get_n_words(fi,n):
    i=0
    txt=""
    c=" "
    space=False
    while i<40 and len(c)==1:
        c = fi.read(1)
        txt+=c
        if c==" " and not space:
            i+=1
            space=True
        else:
            space=False
        
    if i==40:
        return (txt,True)
    return (txt,False)

def prev(path):
    fi = open(path)
    txt=get_n_words(fi,40)
    print '<div class="preview">'+txt[0]
    if txt[1]:
        print '<i>&nbsp;...</i>'
    print '</div>'
    fi.close()
    
def prev_txt(path):
    fi = open(path)
    txt=get_n_words(fi,40)
    print '<div class="preview">'+markdown.markdown(txt[0],extensions=['math'])
    if txt[1]:
        print '<i>&nbsp;...</i>'
    print '</div>'
    fi.close()
    
def prev_source(path):
    return