from __future__ import unicode_literals

import json

from moto.core.responses import BaseResponse
from .models import kinesis_backends


class KinesisResponse(BaseResponse):

    @property
    def parameters(self):
        return json.loads(self.body.decode("utf-8"))

    @property
    def kinesis_backend(self):
        return kinesis_backends[self.region]

    @property
    def is_firehose(self):
        host = self.headers.get('host') or self.headers['Host']
        return host.startswith('firehose')

    def create_stream(self):
        stream_name = self.parameters.get('StreamName')
        shard_count = self.parameters.get('ShardCount')
        self.kinesis_backend.create_stream(stream_name, shard_count, self.region)
        return ""

    def describe_stream(self):
        stream_name = self.parameters.get('StreamName')
        stream = self.kinesis_backend.describe_stream(stream_name)
        return json.dumps(stream.to_json())

    def list_streams(self):
        streams = self.kinesis_backend.list_streams()

        return json.dumps({
            "HasMoreStreams": False,
            "StreamNames": [stream.stream_name for stream in streams],
        })

    def delete_stream(self):
        stream_name = self.parameters.get("StreamName")
        self.kinesis_backend.delete_stream(stream_name)

        return ""

    def get_shard_iterator(self):
        stream_name = self.parameters.get("StreamName")
        shard_id = self.parameters.get("ShardId")
        shard_iterator_type = self.parameters.get("ShardIteratorType")
        starting_sequence_number = self.parameters.get("StartingSequenceNumber")

        shard_iterator = self.kinesis_backend.get_shard_iterator(
            stream_name, shard_id, shard_iterator_type, starting_sequence_number,
        )

        return json.dumps({
            "ShardIterator": shard_iterator
        })

    def get_records(self):
        shard_iterator = self.parameters.get("ShardIterator")
        limit = self.parameters.get("Limit")

        next_shard_iterator, records = self.kinesis_backend.get_records(shard_iterator, limit)

        return json.dumps({
            "NextShardIterator": next_shard_iterator,
            "Records": [record.to_json() for record in records]
        })

    def put_record(self):
        if self.is_firehose:
            return self.firehose_put_record()
        stream_name = self.parameters.get("StreamName")
        partition_key = self.parameters.get("PartitionKey")
        explicit_hash_key = self.parameters.get("ExplicitHashKey")
        sequence_number_for_ordering = self.parameters.get("SequenceNumberForOrdering")
        data = self.parameters.get("Data")

        sequence_number, shard_id = self.kinesis_backend.put_record(
            stream_name, partition_key, explicit_hash_key, sequence_number_for_ordering, data
        )

        return json.dumps({
            "SequenceNumber": sequence_number,
            "ShardId": shard_id,
        })

    def put_records(self):
        if self.is_firehose:
            return self.firehose_put_record()
        stream_name = self.parameters.get("StreamName")
        records = self.parameters.get("Records")

        response = self.kinesis_backend.put_records(
            stream_name, records
        )

        return json.dumps(response)

    ''' Firehose '''
    def create_delivery_stream(self):
        stream_name = self.parameters['DeliveryStreamName']
        redshift_config = self.parameters.get('RedshiftDestinationConfiguration')

        if redshift_config:
            redshift_s3_config = redshift_config['S3Configuration']
            stream_kwargs = {
                'redshift_username': redshift_config['Username'],
                'redshift_password': redshift_config['Password'],
                'redshift_jdbc_url': redshift_config['ClusterJDBCURL'],
                'redshift_role_arn': redshift_config['RoleARN'],
                'redshift_copy_command': redshift_config['CopyCommand'],

                'redshift_s3_role_arn': redshift_s3_config['RoleARN'],
                'redshift_s3_bucket_arn': redshift_s3_config['BucketARN'],
                'redshift_s3_prefix': redshift_s3_config['Prefix'],
                'redshift_s3_compression_format': redshift_s3_config.get('CompressionFormat'),
                'redshift_s3_buffering_hings': redshift_s3_config['BufferingHints'],
            }
        stream = self.kinesis_backend.create_delivery_stream(stream_name, **stream_kwargs)
        return json.dumps({
            'DeliveryStreamARN': stream.arn
        })

    def describe_delivery_stream(self):
        stream_name = self.parameters["DeliveryStreamName"]
        stream = self.kinesis_backend.get_delivery_stream(stream_name)
        return json.dumps(stream.to_dict())

    def list_delivery_streams(self):
        streams = self.kinesis_backend.list_delivery_streams()
        return json.dumps({
            "DeliveryStreamNames": [
                stream.name for stream in streams
            ],
            "HasMoreDeliveryStreams": False
        })

    def delete_delivery_stream(self):
        stream_name = self.parameters['DeliveryStreamName']
        self.kinesis_backend.delete_delivery_stream(stream_name)
        return json.dumps({})

    def firehose_put_record(self):
        stream_name = self.parameters['DeliveryStreamName']
        record_data = self.parameters['Record']['Data']

        record = self.kinesis_backend.put_firehose_record(stream_name, record_data)
        return json.dumps({
            "RecordId": record.record_id,
        })

    def put_record_batch(self):
        stream_name = self.parameters['DeliveryStreamName']
        records = self.parameters['Records']

        request_responses = []
        for record in records:
            record_response = self.kinesis_backend.put_firehose_record(stream_name, record['Data'])
            request_responses.append({
                "RecordId": record_response.record_id
            })
        return json.dumps({
            "FailedPutCount": 0,
            "RequestResponses": request_responses,
        })