# -*- coding: utf-8 -*-
"""
Injects the needed javascript to make custom fields depend on selected
component.

License: BSD

(c) 2008      ::: UfSoft.org - Pedro Algarvio(ufs@ufsoft.org)
"""

from trac.core import *
from trac.web.api import ITemplateStreamFilter

from genshi.filters.transform import Transformer
from genshi.builder import tag

from api import CustomFields


class ComponentDependableCustomTickets(Component):
    implements(ITemplateStreamFilter)

    def filter_stream(self, req, method, filename, stream, data):
        if not (req.path_info.startswith('/newticket') or \
           req.path_info.startswith('/ticket')):
            return stream

        cfapi = CustomFields(self.env)
        fields = {}
        for f in cfapi.get_custom_fields(self.env):
            components_field = '%s.components' % f['name']
            self.env.log.debug("Gathering components from field %s",
                               components_field)
            components = self.config.get('ticket-custom',
                                         components_field, '').split('|')
            self.env.log.debug("Gathered %r", components)
            fields["field-%s" % f['name']] = components

        js = """\
jQuery(document).ready( function() {
  jQuery("#field-component").change( function() {
    switch (this.value) {
"""
        for f in fields.keys():
            for c in fields[f]:
                js +='      case "%s":\n' % c
                js +='        jQuery("#%s").enable(true);\n' % f
                for k in fields.keys():
                    if k != f:
                        js += '        jQuery("#%s").enable(false);\n' % k
                js += '        break;\n'

        js += '      default:\n'
        for f in fields.keys():
            js += '        jQuery("#%s").enable(false);\n' % f
        js += '    };\n'
        js += '  });\n'
        js += '  jQuery("#field-component").change();\n'
        js += '  jQuery("#field-component").submit( function() {\n'
        for f in fields.keys():
            js += '    jQuery("#%s").enable(true);\n' % f
        js += '  });\n'
        js += '});\n'
        return stream | Transformer('body').\
                append(tag.script(js, type="text/javascript"))