#!/usr/bin/env python
# -*- coding: utf-8 -*-

# Python Imports
import os
import re
import cgi
import sys


def usage():
    print """Usage: %s content.html [template.html] slides/
Content should be HTML containing <h1> tags.
A new page will be created for each <h1> tag.
    """ % (os.path.basename(sys.argv[0]))

class Slide:
    def __init__(self, title, atts):
        assert title
        self.lines=[]
        self.title=title
        self.atts=atts
        self.text=None

def fill_template(tmpl, mydict):
    assert mydict.get('title')
    tmpl=re.sub(r'%([^(])', r'%%\1', tmpl)
    return tmpl % mydict

def main():
    args=list(sys.argv[1:])
    if len(args)!=3:
        usage()
        sys.exit(1)
    htmlfile=args[0]
    templatefile=args[1]
    template=open(templatefile).read()
    outdir=args[2]
    if not os.path.isdir(outdir):
        raise ValueError("%s is not a directory." % outdir)

    fd=open(htmlfile)
    slides=[]
    def endslide(slides, slide):
        slide.text=''.join(slide.lines)
        slide.lines=None
    slide=None
    comments=0
    linecount=0
    for line in fd:
        linecount+=1
        match=re.match(r'^(.*?)<h1(.*?)>(.*?)</h1>(.*)$', line)
        if match:
            if match.group(1):
                raise ValueError("Text before <h1>: '%s'" % (match.group(1)))
            if match.group(4):
                raise ValueError("Text after </h1>: '%s'" % (match.group(4)))
            attr=match.group(2)
            title=match.group(3)
            if slides:
                endslide(slides, slide)
            slide=Slide(title, attr)
            slides.append(slide)
            continue
        (line, n)=re.subn(r'\(#', '<span class="comment">', line)
        if n and comments:
            raise ValueError("Comments (# ..#) mustnot be nested %s line %s" % (
                htmlfile, linecount))
        comments+=n
        (line, n)=re.subn(r'#\)', '</span>', line)
        comments-=n
        if n and comments!=0:
            raise ValueError("Closing comment '#)' without opening comment. %s line %s" % (
                htmlfile, linecount))
            
        if not slides:
            continue
        slide.lines.append(line)
    if not comments==0:
        raise ValueError("Number of opening comments '(#' "
                         "does not match number of closing comments '#)'")
    if not slide:
        raise ValueError('No line with "<h1>...</h1>" found: %s' % htmlfile)
    endslide(slides, slide)
    i=0
    all_titles=[]
    all_slides=[]
    bottom=""
    css=""
    for slide in slides:
        i+=1
        title=cgi.escape(slide.title)
        if i>1:
            prev='<a id="prev" href="slide_%03d.html">[Prev]</a>' % (
                i-1)
        else:
            prev='<a id="prev" href="index.html">[Index]</a>'
        if i!=len(slides):
            next='<a id="next" href="slide_%03d.html">[Next]</a>' % (
                i+1)
        else:
            next='<a id="next" href="index.html">[Index]</a>'
        toc='<a href="index.html">%dv%d</a>' % (
            i, len(slides))
        main=slide.text
        all_slides.append(main)
        outfile=os.path.join(outdir, "slide_%03d.html" % i)
        fd=open(outfile, "wt")
        html=fill_template(template, locals())
        fd.write(html)
        fd.close()
        all_titles.append('<tr><td align="right">%d</td><td><a href="slide_%03d.html">%s</a></td></tr>' % (
            i, i, title))
    print "Created slides in %s" % outdir
    indexfile=os.path.join(outdir, "index.html")
    main='''
     <table>
      %s
     </table>''' % '\n'.join(all_titles)
    toc=""
    prev='<a id="prev" href="slide_%03d.html">[End]</a>' % len(slides)
    next='<a id="next" href="slide_001.html">[Start]</a>'
    title="Index"
    bottom='<a href="all.html">All</a>'
    css=""
    index=fill_template(template, locals())
    fd=open(indexfile, "wt")
    fd.write(index)
    fd.close()
    print "Created TOC %s" % indexfile
    
    # The page with all slides
    prev=""
    next=""
    title=""
    bottom=""
    css='''
    <style type="text/css">
    .hide {
     display: block;
     font-family: monospace;
     white-space: pre;
     }
    </style>'''
    toc='<a href="index.html">Index</a>'
    title='Index'
    main='<hr class="pagesep">'.join(all_slides)
    main=main.replace('<span class="comment">', '<span class="comment_show">')
    allfile=os.path.join(outdir, "all.html")
    fd=open(allfile, "wt")
    fd.write(fill_template(template, locals()))
    fd.close()
    print "Created All Pages (incl. Comments): %s" % allfile
if __name__=="__main__":
    main()

template='''<html>
 <head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <link rel="stylesheet" type="text/css" href="misc/style.css">
  <script src="misc/slides.js" type="text/javascript"></script>
  %(css)s
  <title>%(title)s</title>
 </head>
 <body onKeyUp="keyhandler(event)">
<table id="all" border="0" width="100%" height="100%">
 <tr style="height: 1%">
  <td width="33%" align="left"></td>
  <td width="33%" align="center">%(toc)s</td>
  <td width="33%" align="right"><img src="misc/logo.gif"></td>
 </tr>
 <tr style="height: 98%">
  <td colspan="3" valign="top">
   <h1>%(title)s</h1>
    <table id="main" width="100%" border="0">
     <tr>
      <td width="20%"></td>
      <td width="60%">%(main)s</td>
      <td width="20%"></td>
     </tr>
    </table>
  </td>
 </tr>
 <tr style="height: 1%">
  <td width="33%" align="left">%(prev)s</td>
  <td width="33%" align="center">%(bottom)s</td>
  <td width="33%" align="right">%(next)s</td>
 </tr>
</table>
 </body>
</html>
'''