# $Id$
# $URL$

websiteConfig = configs['website']

# FIXME: Move to config!
NR_OF_PAGES=5
RESULTS_PER_PAGE=10

def _paginatorLink(pageNumber, text, arguments):
    offset = (pageNumber-1) * RESULTS_PER_PAGE
    linkArguments = arguments.copy()
    linkArguments['offset'] = offset
    encodedArguments = escapeHtml(urlencode(linkArguments)).replace('"', '"')
    yield """<a href="?%(args)s">%(text)s</a> """ % {'args': encodedArguments, 'text': text}

def paginate(offset, nrOfResults, resultsPerPage=RESULTS_PER_PAGE, nrOfPages=NR_OF_PAGES):
    currentPage = offset / resultsPerPage + 1
    firstPage = max(1, currentPage - nrOfPages)
    lastPage = min(currentPage + nrOfPages, int(ceil(nrOfResults / float(resultsPerPage))))
    return range(firstPage, currentPage), currentPage, range(currentPage+1, lastPage+1)

def main(offset, nrOfResults, headers={}, arguments={}, path='', *args, **kwargs):
    language = 'en' # path.startswith('/en/') and 'en' or 'nl'
    websiteConfig.setDefaults(section='paginate',language=language)

    next = websiteConfig.get('next',default='next')
    prev = websiteConfig.get('previous',default='previous')

    if nrOfResults > RESULTS_PER_PAGE:
        yield """<div class="paginator">\n"""
        firstPages, currentPage, lastPages = paginate(offset, nrOfResults)
        if firstPages:
            yield _paginatorLink(currentPage-1, prev, arguments)
        for pageNumber in firstPages:
            yield _paginatorLink(pageNumber, pageNumber, arguments)
        yield """<span class="current">%s</span> """ % currentPage
        for pageNumber in lastPages:
            yield _paginatorLink(pageNumber, pageNumber, arguments)
        if lastPages:
            yield _paginatorLink(currentPage+1, next , arguments)
        yield """</div>\n"""