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

"""Run templatisation on a template name or file

`CreoleCat` support two modes:

  - run on a template name with option -t: the name is looked up in
    ``/usr/share/eole/creole/distrib/``. The output files are
    calculated unless you explicitely specify ``-o``.

  - run on a file with options -s: this mode requires the use of
    ``-o`` option.

"""

import sys
import os
import argparse

from os.path import basename, join, split

from pyeole import scriptargs
from pyeole.log import init_logging

from creole.template import CreoleTemplateEngine
import creole.config as cfg
from creole.client import CreoleClient, CreoleClientError
from pyeole.ihm import only_root

only_root()

client = CreoleClient()

def parse_cmdline():
    """Parse commande line.
    """
    parser = argparse.ArgumentParser(description="Instancie un template creole",
                                     parents=[scriptargs.container(),
                                              scriptargs.logging()])
    parser.add_argument("-t", "--template", metavar="NAME",
                  help=u"nom du fichier template creole présent "
                        "dans /usr/share/eole/creole/distrib")
    parser.add_argument("-s", "--source", metavar="PATH",
                  help=u"chemin d’un fichier template")
    parser.add_argument("-o", "--output", metavar="OUTPUTFILE",
                  help=u"chemin du fichier généré")

    opts = parser.parse_args()

    if (opts.template is None and opts.source is None) \
       or (opts.template and opts.source):
        parser.error("Vous devez spécifier une des options"
                     "'--template' ou '--source'.")

    if opts.source is not None and not os.access(opts.source, os.F_OK):
        parser.error("Fichier source inexistant"
                     " ou illisible: {0}".format(opts.source))

    if opts.output is None:
        if opts.source is not None:
            opts.output = ""
    else:
        if opts.template is not None \
           and opts.output == join(cfg.distrib_dir, opts.template):
            parser.error("Le fichier de sortie ne peut écraser"
                         " le fichier template: {0}".format(opts.output) )
        if opts.source is not None and opts.output == opts.source:
            parser.error("Le fichier de sortie ne peut écraser"
                         " le fichier source: {0}".format(opts.output) )

    if opts.verbose:
        opts.log_level = 'info'
    if opts.debug:
        opts.log_level = 'debug'

    return opts


def _find_file(name, ctx):
    candidates = client.to_grouped_lists(ctx['files'], keyname='source')
    for source, filevar in candidates.items():
        if name != basename(source):
            continue
        elif filevar[0].get('activate', False):
            return filevar[0]


def main():
    """Setup environnment and run templatisation.
    """

    options = parse_cmdline()
    try:
        log = init_logging(level=options.log_level)

        engine = CreoleTemplateEngine()

        filevar = { 'source': options.source,
                    'name': options.output,
                    'full_name': options.output,
                    'activate' : True,
                    'del_comment': u'',
                    'mkdir' : False,
                    'rm' : False,
        }

        if options.container is not None:
            # force container context
            groups = [client.get_container_infos(options.container)]
        elif options.output is not None:
            # Source without container, for root context
            groups = [client.get_container_infos('root')]
        else:
            groups = []
            for group in client.get_groups():
                groups.append(client.get_group_infos(group))

        instanciated_files = []
        for group in groups:
            if filevar['source'] is not None:
                instanciated_files.append(filevar)
                engine.process(filevar, group)
            elif options.template is not None:
                found_file = _find_file(options.template, group)
                if found_file:
                    instanciated_files.append(found_file)
                    if options.output is None:
                        engine._instance_file(found_file, group)
                    else:
                        # Override output
                        found_file['name'] = options.output
                        found_file['full_name'] = options.output
                        # Do not get through verify and
                        # change_properties
                        engine._copy_to_template_dir(found_file)
                        engine.process(found_file, group)

        if not instanciated_files:
            # No file get instanciated
            raise CreoleClientError("Fichier template inexistant:"
                                    " {0}".format(options.template))

    except Exception, err:
        if options.debug:
            log.debug(err, exc_info=True)
        else:
            log.error(err)
        sys.exit(1)
    sys.exit(0)

if __name__ == '__main__':
    main()