#!/usr/bin/python
# Copyright 2016 Google Inc. All Rights Reserved.
#
# 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.

# PHP detection script.

import json
import os
import posixpath
import sys

def get_config():
    """Requests the current runtime configuration.

    Returns:
        A dictionary containing the current runtime configuration.

    Raises:
        IOError: An error occurred writing to the controller.
    """
    json.dump({'type': 'get_config'}, sys.stdout)
    sys.stdout.write('\n')
    sys.stdout.flush()

    return json.loads(sys.stdin.readline())

def main(args):
    if len(args) != 2:
        print 'Invalid Usage: {} <source-root-directory>'.format(args[0])
        return 1

    config = get_config()
    params = config['params']
    appinfo = params['appinfo']
    entrypoint = None
    if appinfo and 'entrypoint' in appinfo:
        entrypoint = appinfo['entrypoint']
        if isinstance(entrypoint, list):
          entrypoint = json.dumps(entrypoint)

    root = '.'
    document_root = '/app'
    if appinfo and 'runtime_config' in appinfo:
        if 'document_root' in appinfo['runtime_config']:
            root = appinfo['runtime_config']['document_root']
            document_root = posixpath.normpath(posixpath.join('/app', root))

    directory = args[1]
    for dirpath, _, filenames in os.walk(directory):
        for filename in filenames:
            if filename.endswith('.php'):
                # "appinfo" writes to the app.yaml when it's generated, and
		# "runtime_data" writes to the Dockerfile
                json_config = {
                    'type': 'runtime_parameters',
                    'appinfo': {
                        'runtime': 'custom' if params['custom'] else 'php',
                        'env': 'flex',
                        'runtime_config': {
                            'document_root': root,
                        },
                    },
                    'runtime_data': {
                        'entrypoint': entrypoint,
                        'document_root': document_root,
                    },
                }
                # Prevent "entrypoint: null" in generated app.yaml
                #if entrypoint:
                #    json_config['appinfo']['entrypoint'] = entrypoint
                json.dump(json_config, sys.stdout)
                sys.stdout.write('\n')
                sys.stdout.flush()
                return 0

    return 1

if __name__ == '__main__':
    sys.exit(main(sys.argv))