#!/usr/bin/env python
"""\
Usage: %prog -x TRANSFORM CONTENT

  TRANSFORM is the compiled theme transform
  CONTENT is an html file.

Usage: %prog -r RULES [options] CONTENT
"""
import logging
import sys
import os.path
from lxml import etree
from six import string_types
from diazo.compiler import compile_theme
from diazo.utils import AC_READ_NET, AC_READ_FILE, _createOptionParser
from diazo.utils import split_params, quote_param
import diazo.runtrace

logger = logging.getLogger('diazo')
usage = __doc__


class RunResolver(etree.Resolver):
    def __init__(self, directory):
        self.directory = directory

    def resolve(self, url, id, context):
        # libxml2 does not do this correctly on it's own with the HTMLParser
        # but it does work in Apache
        if '://' in url or url.startswith('/'):
            # It seems we must explicitly resolve the url here
            return self.resolve_filename(url, context)
        url = os.path.join(self.directory, url)
        return self.resolve_filename(url, context)


def main():
    """Called from console script
    """
    op = _createOptionParser(usage=usage)
    op.add_option("-x", "--xsl",
                  metavar="transform.xsl",
                  help="XSL transform",
                  dest="xsl",
                  default=None)
    op.add_option("--path",
                  metavar="PATH",
                  help="URI path",
                  dest="path",
                  default=None)
    op.add_option("--parameters",
                  metavar="param1=val1,param2=val2",
                  help="Set the values of arbitrary parameters",
                  dest="parameters",
                  default=None)
    op.add_option("--runtrace-xml",
                  metavar="runtrace.xml",
                  help="Write an xml format runtrace to file",
                  dest="runtrace_xml",
                  default=None)
    op.add_option("--runtrace-html",
                  metavar="runtrace.html",
                  help="Write an html format runtrace to file",
                  dest="runtrace_html",
                  default=None)
    (options, args) = op.parse_args()

    if len(args) > 2:
        op.error("Wrong number of arguments.")
    elif len(args) == 2:
        if options.xsl or options.rules:
            op.error("Wrong number of arguments.")
        path, content = args
        if path.lower().endswith('.xsl'):
            options.xsl = path
        else:
            options.rules = path
    elif len(args) == 1:
        content, = args
    else:
        op.error("Wrong number of arguments.")
    if options.rules is None and options.xsl is None:
        op.error("Must supply either options or rules")

    if options.trace:
        logger.setLevel(logging.DEBUG)

    runtrace = False
    if options.runtrace_xml or options.runtrace_html:
        runtrace = True

    parser = etree.HTMLParser()
    parser.resolvers.add(RunResolver(os.path.dirname(content)))

    if options.xsl is not None:
        output_xslt = etree.parse(options.xsl)
    else:

        xsl_params = None
        if options.xsl_params:
            xsl_params = split_params(options.xsl_params)

        output_xslt = compile_theme(
            rules=options.rules,
            theme=options.theme,
            extra=options.extra,
            parser=parser,
            read_network=options.read_network,
            absolute_prefix=options.absolute_prefix,
            includemode=options.includemode,
            indent=options.pretty_print,
            xsl_params=xsl_params,
            runtrace=runtrace,
        )

    if content == '-':
        content = sys.stdin

    if options.read_network:
        access_control = AC_READ_NET
    else:
        access_control = AC_READ_FILE

    transform = etree.XSLT(output_xslt, access_control=access_control)
    content_doc = etree.parse(content, parser=parser)
    params = {}
    if options.path is not None:
        params['path'] = "'%s'" % options.path

    if options.parameters:
        for key, value in split_params(options.parameters).items():
            params[key] = quote_param(value)

    output_html = transform(content_doc, **params)
    if isinstance(options.output, string_types):
        out = open(options.output, 'wt')
    else:
        out = options.output
    out.write(str(output_html))

    if runtrace:
        runtrace_doc = diazo.runtrace.generate_runtrace(
            rules=options.rules,
            error_log=transform.error_log)
        if options.runtrace_xml:
            if options.runtrace_xml == '-':
                out = sys.stdout
            else:
                out = open(options.runtrace_xml, 'wt')
            runtrace_doc.write(out, encoding='utf-8',
                               pretty_print=options.pretty_print)
        if options.runtrace_html:
            if options.runtrace_html == '-':
                out = sys.stdout
            else:
                out = open(options.runtrace_html, 'wt')
            out.write(str(diazo.runtrace.runtrace_to_html(runtrace_doc)))

    for msg in transform.error_log:
        if not msg.message.startswith('<runtrace '):
            logger.warn(msg)


if __name__ == '__main__':
    main()