#!/usr/bin/env python

# Copyright 2016 Google, Inc
#
# 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.

"""Analyzes text using the Google Cloud Natural Language API."""

import argparse
import json
import sys

import googleapiclient.discovery


def get_native_encoding_type():
    """Returns the encoding type that matches Python's native strings."""
    if sys.maxunicode == 65535:
        return 'UTF16'
    else:
        return 'UTF32'


def analyze_entities(text, encoding='UTF32'):
    body = {
        'document': {
            'type': 'PLAIN_TEXT',
            'content': text,
        },
        'encoding_type': encoding,
    }

    service = googleapiclient.discovery.build('language', 'v1')

    request = service.documents().analyzeEntities(body=body)
    response = request.execute()

    return response


def analyze_sentiment(text, encoding='UTF32'):
    body = {
        'document': {
            'type': 'PLAIN_TEXT',
            'content': text,
        },
        'encoding_type': encoding
    }

    service = googleapiclient.discovery.build('language', 'v1')

    request = service.documents().analyzeSentiment(body=body)
    response = request.execute()

    return response


def analyze_syntax(text, encoding='UTF32'):
    body = {
        'document': {
            'type': 'PLAIN_TEXT',
            'content': text,
        },
        'encoding_type': encoding
    }

    service = googleapiclient.discovery.build('language', 'v1')

    request = service.documents().analyzeSyntax(body=body)
    response = request.execute()

    return response


if __name__ == '__main__':
    parser = argparse.ArgumentParser(
        description=__doc__,
        formatter_class=argparse.RawDescriptionHelpFormatter)
    parser.add_argument('command', choices=[
        'entities', 'sentiment', 'syntax'])
    parser.add_argument('text')

    args = parser.parse_args()

    if args.command == 'entities':
        result = analyze_entities(args.text, get_native_encoding_type())
    elif args.command == 'sentiment':
        result = analyze_sentiment(args.text, get_native_encoding_type())
    elif args.command == 'syntax':
        result = analyze_syntax(args.text, get_native_encoding_type())

    print(json.dumps(result, indent=2))