#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.


import logging.config
import os
import sys

from toscaparser.tosca_template import ToscaTemplate
from toscaparser.utils.gettextutils import _
from toscaparser.utils.urlutils import UrlUtils
from translator.hot.tosca_translator import TOSCATranslator

"""
Test the heat-translator translation from command line as:
#heat-translator
  --template-file=<path to the YAML template>
  --template-type=<type of template e.g. tosca>
  --parameters="purpose=test"
Takes three user arguments,
1. type of translation (e.g. tosca) (required)
2. Path to the file that needs to be translated (required)
3. Input parameters (optional)

In order to use heat-translator to only validate template,
without actual translation, pass --validate-only=true along with
other required arguments.

"""

log = logging.getLogger("heat-translator")


class TranslatorShell(object):

    SUPPORTED_TYPES = ['tosca']

    def _validate(self, args):
        if len(args) < 2:
            msg = _("The program requires minimum two arguments. "
                    "Please refer to the usage documentation.")
            raise ValueError(msg)
        if "--template-file=" not in args[0]:
            msg = _("The program expects --template-file as first argument. "
                    "Please refer to the usage documentation.")
            raise ValueError(msg)
        if "--template-type=" not in args[1]:
            msg = _("The program expects --template-type as second argument. "
                    "Please refer to the usage documentation.")
            raise ValueError(msg)

    def main(self, args):
        self._validate(args)
        path = args[0].split('--template-file=')[1]
        # e.g. --template_file=translator/tests/data/tosca_helloworld.yaml
        template_type = args[1].split('--template-type=')[1]
        # e.g. --template_type=tosca
        if not template_type:
            raise ValueError(_("Template type is needed. "
                               "For example, 'tosca'"))
        elif template_type not in self.SUPPORTED_TYPES:
            raise ValueError(_("%(value)s is not a valid template type.")
                             % {'value': template_type})
        parsed_params = {}
        validate_only = None
        output_file = None
        if len(args) > 2:
            parameters = None
            for arg in args:
                if "--validate-only=" in arg:
                    validate_only = arg
                if "--parameters=" in arg:
                    parameters = arg
                if "--output-file=" in arg:
                    output = arg
                    output_file = output.split('--output-file=')[1]
            if parameters:
                parsed_params = self._parse_parameters(parameters)
        a_file = os.path.isfile(path)
        a_url = UrlUtils.validate_url(path) if not a_file else False
        if a_file or a_url:
            run_only_validation = False
            if validate_only:
                value = validate_only.split('-validate-only=')[1].lower()
                if template_type == 'tosca' and value == 'true':
                    run_only_validation = True
            if run_only_validation:
                ToscaTemplate(path, parsed_params, a_file)
            else:
                heat_tpl = self._translate(template_type, path, parsed_params,
                                           a_file)
                if heat_tpl:
                    self._write_output(heat_tpl, output_file)
        else:
            raise ValueError(_("The path %(path)s is not a valid file"
                               " or URL.") % {'path': path})

    def _parse_parameters(self, parameter_list):
        parsed_inputs = {}
        if parameter_list.startswith('--parameters'):
            # Parameters are semi-colon separated
            inputs = parameter_list.split('--parameters=')[1].\
                replace('"', '').split(';')
            # Each parameter should be an assignment
            for param in inputs:
                keyvalue = param.split('=')
                # Validate the parameter has both a name and value
                if keyvalue.__len__() is 2:
                    # Assure parameter name is not zero-length or whitespace
                    stripped_name = keyvalue[0].strip()
                    if not stripped_name:
                        raise ValueError(_("'%(param)s' is not a well-formed "
                                         "parameter.") % {'param': param})
                    # Add the valid parameter to the dictionary
                    parsed_inputs[keyvalue[0]] = keyvalue[1]
                else:
                    raise ValueError(_("'%(param)s' is not a well-formed "
                                     "parameter.") % {'param': param})
        else:
            raise ValueError(_("'%(list)s' is not a valid parameter list.")
                             % {'list': parameter_list})
        return parsed_inputs

    def _translate(self, sourcetype, path, parsed_params, a_file):
        output = None
        if sourcetype == "tosca":
            tosca = ToscaTemplate(path, parsed_params, a_file)
            translator = TOSCATranslator(tosca, parsed_params)
            output = translator.translate()
        return output

    def _write_output(self, output, output_file=None):
        if output:
            if output_file:
                with open(output_file, 'w+') as f:
                    f.write(output)
            else:
                print(output)


def main(args=None):
    if args is None:
        args = sys.argv[1:]
    TranslatorShell().main(args)


if __name__ == '__main__':
    main()