import optparse
import os

import xml_parser
import reqif_conv


class reqif_dict(dict):
    KEY_TITLE = 'titel'
    KEY_COMMENT = 'comment'
    KEY_ITEM_DICT = 'item_dict'
    KEY_UID_LIST_SORTED = 'uid_list_sorted'

    def __init__(self, filename, specification_key, specification_identifier):
        dict.__init__(self)
        self.rd = reqif(filename)
        self[self.KEY_TITLE] = self.rd.get_title()
        self[self.KEY_COMMENT] = self.rd.get_comment()
        self[self.KEY_UID_LIST_SORTED] = []
        for specification in self.rd.get_specifications():
            if specification.get(specification_key) == specification_identifier:
                sw_spec = specification
                break
        #
        self[self.KEY_ITEM_DICT] = {}
        for obj_id in sw_spec.children:
            item = self.rd.get_spec_object(obj_id)
            req_id = item.get('system_uid')
            self[self.KEY_ITEM_DICT][req_id] = item
            if req_id is not None:
                self[self.KEY_UID_LIST_SORTED].append(req_id)


class reqif(object):
    def __init__(self, filename):
        self._data = xml_parser.parse(filename)

    def get_comment(self):
        return self._data._comment

    def get_data_types(self):
        return self._data._datatypes

    def get_relations_by_id(self, obj_id):
        rv = dict()
        rv['incomming'] = list()
        rv['outgoing'] = list()
        for relation in self._data._relations:
            if obj_id == relation[xml_parser.KEY_SOURCE]:
                rv['outgoing'].append(relation)
            elif obj_id == relation[xml_parser.KEY_TARGET]:
                rv['incomming'].append(relation)
        return rv

    def get_specifications(self):
        return self._data._specifications

    def get_specification_by_id(self, obj_id):
        for specification in self._data._specifications:
            if obj_id == specification[xml_parser.KEY_SYSTEM_UID]:
                return specification

    def get_spec_object(self, obj_id):
        return self._data._spec_objects[obj_id]

    def get_spec_types(self):
        return self._data._spec_types

    def get_title(self):
        return self._data._title


if __name__ == '__main__':
    parser = optparse.OptionParser("usage: %%prog reqif_file [options]")
    (options, args) = parser.parse_args()

    #
    # Check options and args
    if len(args) != 1 or not os.path.isfile(args[0]):
        parser.print_help()
    else:
        reqif_path = args[0]
        tex_path = os.path.abspath(os.path.splitext(reqif_path)[0] + '.tex')
        reqif_data = reqif_dict(reqif_path, 'Heading', 'Software Specification')
        reqif_conv.tex_gen(reqif_data, tex_path)
        reqif_conv.pdf_gen(tex_path)