#!/usr/bin/env python
#    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 os
import sys
import traceback
import yaml


def exit_usage():
    print('Usage %s <yaml file or directory>' % sys.argv[0])
    sys.exit(1)


def validate_service(filename, tpl):
    if 'outputs' in tpl and 'role_data' in tpl['outputs']:
        if 'value' not in tpl['outputs']['role_data']:
            print('ERROR: invalid role_data for filename: %s'
                  % filename)
            return 1
        role_data = tpl['outputs']['role_data']['value']
        if 'service_name' not in role_data:
            print('ERROR: service_name is required in role_data for %s.'
                  % filename)
            return 1
        # service_name must match the filename, but with an underscore
        if (role_data['service_name'] !=
                os.path.basename(filename).split('.')[0].replace("-", "_")):
            print('ERROR: service_name should match file name for service: %s.'
                  % filename)
            return 1
    if 'parameters' in tpl:
        required_params = ['EndpointMap', 'ServiceNetMap', 'DefaultPasswords']
        for param in required_params:
            if param not in tpl['parameters']:
                print('ERROR: parameter %s is required for %s.'
                      % (param, filename))
                return 1
    return 0


def validate(filename):
    print('Validating %s' % filename)
    retval = 0
    try:
        tpl = yaml.load(open(filename).read())

        if (filename.startswith('./puppet/services/') and
                filename != './puppet/services/services.yaml'):
            retval = validate_service(filename, tpl)

    except Exception:
        print(traceback.format_exc())
        return 1
    # yaml is OK, now walk the parameters and output a warning for unused ones
    for p in tpl.get('parameters', {}):
        str_p = '\'%s\'' % p
        in_resources = str_p in str(tpl.get('resources', {}))
        in_outputs = str_p in str(tpl.get('outputs', {}))
        if not in_resources and not in_outputs:
            print('Warning: parameter %s in template %s appears to be unused'
                  % (p, filename))

    return retval

if len(sys.argv) < 2:
    exit_usage()

path_args = sys.argv[1:]
exit_val = 0
failed_files = []

for base_path in path_args:
    if os.path.isdir(base_path):
        for subdir, dirs, files in os.walk(base_path):
            for f in files:
                if f.endswith('.yaml'):
                    file_path = os.path.join(subdir, f)
                    failed = validate(file_path)
                    if failed:
                        failed_files.append(file_path)
                    exit_val |= failed
    elif os.path.isfile(base_path) and base_path.endswith('.yaml'):
        failed = validate(base_path)
        if failed:
            failed_files.append(base_path)
        exit_val |= failed
    else:
        print('Unexpected argument %s' % base_path)
        exit_usage()

if failed_files:
    print('Validation failed on:')
    for f in failed_files:
        print(f)
else:
    print('Validation successful!')
sys.exit(exit_val)