#!/usr/bin/python
#
# This is a free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This Ansible library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this library.  If not, see <http://www.gnu.org/licenses/>.

ANSIBLE_METADATA = {'status': ['preview'],
                    'supported_by': 'community',
                    'version': '1.0'}

DOCUMENTATION = '''
---
module: kinesis_stream
short_description: Manage a Kinesis Stream.
description:
    - Create or Delete a Kinesis Stream.
    - Update the retention period of a Kinesis Stream.
    - Update Tags on a Kinesis Stream.
version_added: "2.2"
author: Allen Sanabria (@linuxdynasty)
options:
  name:
    description:
      - "The name of the Kinesis Stream you are managing."
    default: None
    required: true
  shards:
    description:
      - "The number of shards you want to have with this stream. This can not
      be modified after being created."
      - "This is required when state == present"
    required: false
    default: None
  retention_period:
    description:
      - "The default retention period is 24 hours and can not be less than 24
      hours."
      - "The retention period can be modified during any point in time."
    required: false
    default: None
  state:
    description:
      - "Create or Delete the Kinesis Stream."
    required: false
    default: present
    choices: [ 'present', 'absent' ]
  wait:
    description:
      - Wait for operation to complete before returning.
    required: false
    default: true
  wait_timeout:
    description:
      - How many seconds to wait for an operation to complete before timing out.
    required: false
    default: 300
  tags:
    description:
      - "A dictionary of resource tags of the form: { tag1: value1, tag2: value2 }."
    required: false
    default: null
    aliases: [ "resource_tags" ]
extends_documentation_fragment:
    - aws
    - ec2
'''

EXAMPLES = '''
# Note: These examples do not set authentication details, see the AWS Guide for details.

# Basic creation example:
- name: Set up Kinesis Stream with 10 shards and wait for the stream to become ACTIVE
  kinesis_stream:
    name: test-stream
    shards: 10
    wait: yes
    wait_timeout: 600
  register: test_stream

# Basic creation example with tags:
- name: Set up Kinesis Stream with 10 shards, tag the environment, and wait for the stream to become ACTIVE
  kinesis_stream:
    name: test-stream
    shards: 10
    tags:
      Env: development
    wait: yes
    wait_timeout: 600
  register: test_stream

# Basic creation example with tags and increase the retention period from the default 24 hours to 48 hours:
- name: Set up Kinesis Stream with 10 shards, tag the environment, increase the retention period and wait for the stream to become ACTIVE
  kinesis_stream:
    name: test-stream
    retention_period: 48
    shards: 10
    tags:
      Env: development
    wait: yes
    wait_timeout: 600
  register: test_stream

# Basic delete example:
- name: Delete Kinesis Stream test-stream and wait for it to finish deleting.
  kinesis_stream:
    name: test-stream
    state: absent
    wait: yes
    wait_timeout: 600
  register: test_stream
'''

RETURN = '''
stream_name:
  description: The name of the Kinesis Stream.
  returned: when state == present.
  type: string
  sample: "test-stream"
stream_arn:
  description: The amazon resource identifier
  returned: when state == present.
  type: string
  sample: "arn:aws:kinesis:east-side:123456789:stream/test-stream"
stream_status:
  description: The current state of the Kinesis Stream.
  returned: when state == present.
  type: string
  sample: "ACTIVE"
retention_period_hours:
  description: Number of hours messages will be kept for a Kinesis Stream.
  returned: when state == present.
  type: int
  sample: 24
tags:
  description: Dictionary containing all the tags associated with the Kinesis stream.
  returned: when state == present.
  type: dict
  sample: {
      "Name": "Splunk",
      "Env": "development"
  }
'''

try:
    import botocore
    import boto3
    HAS_BOTO3 = True
except ImportError:
    HAS_BOTO3 = False

import re
import datetime
import time
from functools import reduce


def convert_to_lower(data):
    """Convert all uppercase keys in dict with lowercase_
    Args:
        data (dict): Dictionary with keys that have upper cases in them
            Example.. FooBar == foo_bar
            if a val is of type datetime.datetime, it will be converted to
            the ISO 8601

    Basic Usage:
        >>> test = {'FooBar': []}
        >>> test = convert_to_lower(test)
        {
            'foo_bar': []
        }

    Returns:
        Dictionary
    """
    results = dict()
    if isinstance(data, dict):
        for key, val in data.items():
            key = re.sub(r'(([A-Z]{1,3}){1})', r'_\1', key).lower()
            if key[0] == '_':
                key = key[1:]
            if isinstance(val, datetime.datetime):
                results[key] = val.isoformat()
            elif isinstance(val, dict):
                results[key] = convert_to_lower(val)
            elif isinstance(val, list):
                converted = list()
                for item in val:
                    converted.append(convert_to_lower(item))
                results[key] = converted
            else:
                results[key] = val
    return results


def make_tags_in_proper_format(tags):
    """Take a dictionary of tags and convert them into the AWS Tags format.
    Args:
        tags (list): The tags you want applied.

    Basic Usage:
        >>> tags = [{'Key': 'env', 'Value': 'development'}]
        >>> make_tags_in_proper_format(tags)
        {
            "env": "development",
        }

    Returns:
        Dict
    """
    formatted_tags = dict()
    for tag in tags:
        formatted_tags[tag.get('Key')] = tag.get('Value')

    return formatted_tags


def make_tags_in_aws_format(tags):
    """Take a dictionary of tags and convert them into the AWS Tags format.
    Args:
        tags (dict): The tags you want applied.

    Basic Usage:
        >>> tags = {'env': 'development', 'service': 'web'}
        >>> make_tags_in_proper_format(tags)
        [
            {
                "Value": "web",
                "Key": "service"
             },
            {
               "Value": "development",
               "key": "env"
            }
        ]

    Returns:
        List
    """
    formatted_tags = list()
    for key, val in tags.items():
        formatted_tags.append({
            'Key': key,
            'Value': val
        })

    return formatted_tags


def get_tags(client, stream_name, check_mode=False):
    """Retrieve the tags for a Kinesis Stream.
    Args:
        client (botocore.client.EC2): Boto3 client.
        stream_name (str): Name of the Kinesis stream.

    Kwargs:
        check_mode (bool): This will pass DryRun as one of the parameters to the aws api.
            default=False

    Basic Usage:
        >>> client = boto3.client('kinesis')
        >>> stream_name = 'test-stream'
        >> get_tags(client, stream_name)

    Returns:
        Tuple (bool, str, dict)
    """
    err_msg = ''
    success = False
    params = {
        'StreamName': stream_name,
    }
    results = dict()
    try:
        if not check_mode:
            results = (
                client.list_tags_for_stream(**params)['Tags']
            )
        else:
            results = [
                {
                    'Key': 'DryRunMode',
                    'Value': 'true'
                },
            ]
        success = True
    except botocore.exceptions.ClientError as e:
        err_msg = str(e)

    return success, err_msg, results


def find_stream(client, stream_name, check_mode=False):
    """Retrieve a Kinesis Stream.
    Args:
        client (botocore.client.EC2): Boto3 client.
        stream_name (str): Name of the Kinesis stream.

    Kwargs:
        check_mode (bool): This will pass DryRun as one of the parameters to the aws api.
            default=False

    Basic Usage:
        >>> client = boto3.client('kinesis')
        >>> stream_name = 'test-stream'

    Returns:
        Tuple (bool, str, dict)
    """
    err_msg = ''
    success = False
    params = {
        'StreamName': stream_name,
    }
    results = dict()
    has_more_shards = True
    shards = list()
    try:
        if not check_mode:
            while has_more_shards:
                results = (
                    client.describe_stream(**params)['StreamDescription']
                )
                shards.extend(results.pop('Shards'))
                has_more_shards = results['HasMoreShards']
            results['Shards'] = shards
            results['ShardsCount'] = len(shards)
        else:
            results = {
                'HasMoreShards': True,
                'RetentionPeriodHours': 24,
                'StreamName': stream_name,
                'StreamARN': 'arn:aws:kinesis:east-side:123456789:stream/{0}'.format(stream_name),
                'StreamStatus': 'ACTIVE'
            }
        success = True
    except botocore.exceptions.ClientError as e:
        err_msg = str(e)

    return success, err_msg, results


def wait_for_status(client, stream_name, status, wait_timeout=300,
                    check_mode=False):
    """Wait for the the status to change for a Kinesis Stream.
    Args:
        client (botocore.client.EC2): Boto3 client
        stream_name (str): The name of the kinesis stream.
        status (str): The status to wait for.
            examples. status=available, status=deleted

    Kwargs:
        wait_timeout (int): Number of seconds to wait, until this timeout is reached.
        check_mode (bool): This will pass DryRun as one of the parameters to the aws api.
            default=False

    Basic Usage:
        >>> client = boto3.client('kinesis')
        >>> stream_name = 'test-stream'
        >>> wait_for_status(client, stream_name, 'ACTIVE', 300)

    Returns:
        Tuple (bool, str, dict)
    """
    polling_increment_secs = 5
    wait_timeout = time.time() + wait_timeout
    status_achieved = False
    stream = dict()
    err_msg = ""

    while wait_timeout > time.time():
        try:
            find_success, find_msg, stream = (
                find_stream(client, stream_name, check_mode=check_mode)
            )
            if check_mode:
                status_achieved = True
                break

            elif status != 'DELETING':
                if find_success and stream:
                    if stream.get('StreamStatus') == status:
                        status_achieved = True
                        break

            elif status == 'DELETING' and not check_mode:
                if not find_success:
                    status_achieved = True
                    break

            else:
                time.sleep(polling_increment_secs)
        except botocore.exceptions.ClientError as e:
            err_msg = str(e)

    if not status_achieved:
        err_msg = "Wait time out reached, while waiting for results"
    else:
        err_msg = "Status {0} achieved successfully".format(status)

    return status_achieved, err_msg, stream


def tags_action(client, stream_name, tags, action='create', check_mode=False):
    """Create or delete multiple tags from a Kinesis Stream.
    Args:
        client (botocore.client.EC2): Boto3 client.
        resource_id (str): The Amazon resource id.
        tags (list): List of dictionaries.
            examples.. [{Name: "", Values: [""]}]

    Kwargs:
        action (str): The action to perform.
            valid actions == create and delete
            default=create
        check_mode (bool): This will pass DryRun as one of the parameters to the aws api.
            default=False

    Basic Usage:
        >>> client = boto3.client('ec2')
        >>> resource_id = 'pcx-123345678'
        >>> tags = {'env': 'development'}
        >>> update_tags(client, resource_id, tags)
        [True, '']

    Returns:
        List (bool, str)
    """
    success = False
    err_msg = ""
    params = {'StreamName': stream_name}
    try:
        if not check_mode:
            if action == 'create':
                params['Tags'] = tags
                client.add_tags_to_stream(**params)
                success = True
            elif action == 'delete':
                params['TagKeys'] = tags.keys()
                client.remove_tags_from_stream(**params)
                success = True
            else:
                err_msg = 'Invalid action {0}'.format(action)
        else:
            if action == 'create':
                success = True
            elif action == 'delete':
                success = True
            else:
                err_msg = 'Invalid action {0}'.format(action)

    except botocore.exceptions.ClientError as e:
        err_msg = str(e)

    return success, err_msg


def recreate_tags_from_list(list_of_tags):
    """Recreate tags from a list of tuples into the Amazon Tag format.
    Args:
        list_of_tags (list): List of tuples.

    Basic Usage:
        >>> list_of_tags = [('Env', 'Development')]
        >>> recreate_tags_from_list(list_of_tags)
        [
            {
                "Value": "Development",
                "Key": "Env"
            }
        ]

    Returns:
        List
    """
    tags = list()
    i = 0
    list_of_tags = list_of_tags
    for i in range(len(list_of_tags)):
        key_name = list_of_tags[i][0]
        key_val = list_of_tags[i][1]
        tags.append(
            {
                'Key': key_name,
                'Value': key_val
            }
        )
    return tags


def update_tags(client, stream_name, tags, check_mode=False):
    """Update tags for an amazon resource.
    Args:
        resource_id (str): The Amazon resource id.
        tags (dict): Dictionary of tags you want applied to the Kinesis stream.

    Kwargs:
        check_mode (bool): This will pass DryRun as one of the parameters to the aws api.
            default=False

    Basic Usage:
        >>> client = boto3.client('ec2')
        >>> stream_name = 'test-stream'
        >>> tags = {'env': 'development'}
        >>> update_tags(client, stream_name, tags)
        [True, '']

    Return:
        Tuple (bool, str)
    """
    success = False
    changed = False
    err_msg = ''
    tag_success, tag_msg, current_tags = (
        get_tags(client, stream_name, check_mode=check_mode)
    )
    if current_tags:
        tags = make_tags_in_aws_format(tags)
        current_tags_set = (
            set(
                reduce(
                    lambda x, y: x + y,
                    [make_tags_in_proper_format(current_tags).items()]
                )
            )
        )

        new_tags_set = (
            set(
                reduce(
                    lambda x, y: x + y,
                    [make_tags_in_proper_format(tags).items()]
                )
            )
        )
        tags_to_delete = list(current_tags_set.difference(new_tags_set))
        tags_to_update = list(new_tags_set.difference(current_tags_set))
        if tags_to_delete:
            tags_to_delete = make_tags_in_proper_format(
                recreate_tags_from_list(tags_to_delete)
            )
            delete_success, delete_msg = (
                tags_action(
                    client, stream_name, tags_to_delete, action='delete',
                    check_mode=check_mode
                )
            )
            if not delete_success:
                return delete_success, changed, delete_msg
        if tags_to_update:
            tags = make_tags_in_proper_format(
                recreate_tags_from_list(tags_to_update)
            )
        else:
            return True, changed, 'Tags do not need to be updated'

    if tags:
        create_success, create_msg = (
            tags_action(
                client, stream_name, tags, action='create',
                check_mode=check_mode
            )
        )
        if create_success:
            changed = True
        return create_success, changed, create_msg

    return success, changed, err_msg


def stream_action(client, stream_name, shard_count=1, action='create',
                  timeout=300, check_mode=False):
    """Create or Delete an Amazon Kinesis Stream.
    Args:
        client (botocore.client.EC2): Boto3 client.
        stream_name (str): The name of the kinesis stream.

    Kwargs:
        shard_count (int): Number of shards this stream will use.
        action (str): The action to perform.
            valid actions == create and delete
            default=create
        check_mode (bool): This will pass DryRun as one of the parameters to the aws api.
            default=False

    Basic Usage:
        >>> client = boto3.client('kinesis')
        >>> stream_name = 'test-stream'
        >>> shard_count = 20
        >>> stream_action(client, stream_name, shard_count, action='create')

    Returns:
        List (bool, str)
    """
    success = False
    err_msg = ''
    params = {
        'StreamName': stream_name
    }
    try:
        if not check_mode:
            if action == 'create':
                params['ShardCount'] = shard_count
                client.create_stream(**params)
                success = True
            elif action == 'delete':
                client.delete_stream(**params)
                success = True
            else:
                err_msg = 'Invalid action {0}'.format(action)
        else:
            if action == 'create':
                success = True
            elif action == 'delete':
                success = True
            else:
                err_msg = 'Invalid action {0}'.format(action)

    except botocore.exceptions.ClientError as e:
        err_msg = str(e)

    return success, err_msg


def retention_action(client, stream_name, retention_period=24,
                     action='increase', check_mode=False):
    """Increase or Decreaste the retention of messages in the Kinesis stream.
    Args:
        client (botocore.client.EC2): Boto3 client.
        stream_name (str): The

    Kwargs:
        retention_period (int): This is how long messages will be kept before
            they are discarded. This can not be less than 24 hours.
        action (str): The action to perform.
            valid actions == create and delete
            default=create
        check_mode (bool): This will pass DryRun as one of the parameters to the aws api.
            default=False

    Basic Usage:
        >>> client = boto3.client('kinesis')
        >>> stream_name = 'test-stream'
        >>> retention_period = 48
        >>> stream_action(client, stream_name, retention_period, action='create')

    Returns:
        Tuple (bool, str)
    """
    success = False
    err_msg = ''
    params = {
        'StreamName': stream_name
    }
    try:
        if not check_mode:
            if action == 'increase':
                params['RetentionPeriodHours'] = retention_period
                client.increase_stream_retention_period(**params)
                success = True
                err_msg = (
                    'Retention Period increased successfully to {0}'
                    .format(retention_period)
                )
            elif action == 'decrease':
                params['RetentionPeriodHours'] = retention_period
                client.decrease_stream_retention_period(**params)
                success = True
                err_msg = (
                    'Retention Period decreased successfully to {0}'
                    .format(retention_period)
                )
            else:
                err_msg = 'Invalid action {0}'.format(action)
        else:
            if action == 'increase':
                success = True
            elif action == 'decrease':
                success = True
            else:
                err_msg = 'Invalid action {0}'.format(action)

    except botocore.exceptions.ClientError as e:
        err_msg = str(e)

    return success, err_msg


def update(client, current_stream, stream_name, retention_period=None,
           tags=None, wait=False, wait_timeout=300, check_mode=False):
    """Update an Amazon Kinesis Stream.
    Args:
        client (botocore.client.EC2): Boto3 client.
        stream_name (str): The name of the kinesis stream.

    Kwargs:
        retention_period (int): This is how long messages will be kept before
            they are discarded. This can not be less than 24 hours.
        tags (dict): The tags you want applied.
        wait (bool): Wait until Stream is ACTIVE.
            default=False
        wait_timeout (int): How long to wait until this operation is considered failed.
            default=300
        check_mode (bool): This will pass DryRun as one of the parameters to the aws api.
            default=False

    Basic Usage:
        >>> client = boto3.client('kinesis')
        >>> current_stream = {
            'HasMoreShards': True,
            'RetentionPeriodHours': 24,
            'StreamName': 'test-stream',
            'StreamARN': 'arn:aws:kinesis:us-west-2:123456789:stream/test-stream',
            'StreamStatus': "ACTIVE'
        }
        >>> stream_name = 'test-stream'
        >>> retention_period = 48
        >>> stream_action(client, current_stream, stream_name,
                          retention_period, action='create' )

    Returns:
        Tuple (bool, bool, str)
    """
    success = True
    changed = False
    err_msg = ''
    if retention_period:
        if wait:
            wait_success, wait_msg, current_stream = (
                wait_for_status(
                    client, stream_name, 'ACTIVE', wait_timeout,
                    check_mode=check_mode
                )
            )
            if not wait_success:
                return wait_success, False, wait_msg

        if current_stream['StreamStatus'] == 'ACTIVE':
            retention_changed = False
            if retention_period > current_stream['RetentionPeriodHours']:
                retention_changed, retention_msg = (
                    retention_action(
                        client, stream_name, retention_period, action='increase',
                        check_mode=check_mode
                    )
                )

            elif retention_period < current_stream['RetentionPeriodHours']:
                retention_changed, retention_msg = (
                    retention_action(
                        client, stream_name, retention_period, action='decrease',
                        check_mode=check_mode
                    )
                )

            elif retention_period == current_stream['RetentionPeriodHours']:
                retention_msg = (
                    'Retention {0} is the same as {1}'
                    .format(
                        retention_period,
                        current_stream['RetentionPeriodHours']
                    )
                )
                success = True

            if retention_changed:
                success = True
                changed = True

            err_msg = retention_msg
            if changed and wait:
                wait_success, wait_msg, current_stream = (
                    wait_for_status(
                        client, stream_name, 'ACTIVE', wait_timeout,
                        check_mode=check_mode
                    )
                )
                if not wait_success:
                    return wait_success, False, wait_msg
            elif changed and not wait:
                stream_found, stream_msg, current_stream = (
                    find_stream(client, stream_name, check_mode=check_mode)
                )
                if stream_found:
                    if current_stream['StreamStatus'] != 'ACTIVE':
                        err_msg = (
                            'Retention Period for {0} is in the process of updating'
                            .format(stream_name)
                        )
                        return success, changed, err_msg
        else:
            err_msg = (
                'StreamStatus has to be ACTIVE in order to modify the retention period. Current status is {0}'
                .format(current_stream['StreamStatus'])
            )
            return success, changed, err_msg

    if tags:
        _, _, err_msg = (
            update_tags(client, stream_name, tags, check_mode=check_mode)
        )
    if wait:
        success, err_msg, _ = (
            wait_for_status(
                client, stream_name, 'ACTIVE', wait_timeout,
                check_mode=check_mode
            )
        )
    if success and changed:
        err_msg = 'Kinesis Stream {0} updated successfully.'.format(stream_name)
    elif success and not changed:
        err_msg = 'Kinesis Stream {0} did not changed.'.format(stream_name)

    return success, changed, err_msg


def create_stream(client, stream_name, number_of_shards=1, retention_period=None,
                  tags=None, wait=False, wait_timeout=300, check_mode=False):
    """Create an Amazon Kinesis Stream.
    Args:
        client (botocore.client.EC2): Boto3 client.
        stream_name (str): The name of the kinesis stream.

    Kwargs:
        number_of_shards (int): Number of shards this stream will use.
            default=1
        retention_period (int): Can not be less than 24 hours
            default=None
        tags (dict): The tags you want applied.
            default=None
        wait (bool): Wait until Stream is ACTIVE.
            default=False
        wait_timeout (int): How long to wait until this operation is considered failed.
            default=300
        check_mode (bool): This will pass DryRun as one of the parameters to the aws api.
            default=False

    Basic Usage:
        >>> client = boto3.client('kinesis')
        >>> stream_name = 'test-stream'
        >>> number_of_shards = 10
        >>> tags = {'env': 'test'}
        >>> create_stream(client, stream_name, number_of_shards, tags=tags)

    Returns:
        Tuple (bool, bool, str, dict)
    """
    success = False
    changed = False
    err_msg = ''
    results = dict()

    stream_found, stream_msg, current_stream = (
        find_stream(client, stream_name, check_mode=check_mode)
    )
    if stream_found and not check_mode:
        if current_stream['ShardsCount'] != number_of_shards:
            err_msg = 'Can not change the number of shards in a Kinesis Stream'
            return success, changed, err_msg, results

    if stream_found and current_stream['StreamStatus'] == 'DELETING' and wait:
        wait_success, wait_msg, current_stream = (
            wait_for_status(
                client, stream_name, 'ACTIVE', wait_timeout,
                check_mode=check_mode
            )
        )
    if stream_found and current_stream['StreamStatus'] != 'DELETING':
        success, changed, err_msg = update(
            client, current_stream, stream_name, retention_period, tags,
            wait, wait_timeout, check_mode=check_mode
        )
    else:
        create_success, create_msg = (
            stream_action(
                client, stream_name, number_of_shards, action='create',
                check_mode=check_mode
            )
        )
        if create_success:
            changed = True
            if wait:
                wait_success, wait_msg, results = (
                    wait_for_status(
                        client, stream_name, 'ACTIVE', wait_timeout,
                        check_mode=check_mode
                    )
                )
                err_msg = (
                    'Kinesis Stream {0} is in the process of being created'
                    .format(stream_name)
                )
                if not wait_success:
                    return wait_success, True, wait_msg, results
            else:
                err_msg = (
                    'Kinesis Stream {0} created successfully'
                    .format(stream_name)
                )

            if tags:
                changed, err_msg = (
                    tags_action(
                        client, stream_name, tags, action='create',
                        check_mode=check_mode
                    )
                )
                if changed:
                    success = True
                if not success:
                    return success, changed, err_msg, results

            stream_found, stream_msg, current_stream = (
                find_stream(client, stream_name, check_mode=check_mode)
            )
            if retention_period and current_stream['StreamStatus'] == 'ACTIVE':
                changed, err_msg = (
                    retention_action(
                        client, stream_name, retention_period, action='increase',
                        check_mode=check_mode
                    )
                )
                if changed:
                    success = True
                if not success:
                    return success, changed, err_msg, results
            else:
                err_msg = (
                    'StreamStatus has to be ACTIVE in order to modify the retention period. Current status is {0}'
                    .format(current_stream['StreamStatus'])
                )
                success = create_success
                changed = True

    if success:
        _, _, results = (
            find_stream(client, stream_name, check_mode=check_mode)
        )
        _, _, current_tags = (
            get_tags(client, stream_name, check_mode=check_mode)
        )
        if current_tags and not check_mode:
            current_tags = make_tags_in_proper_format(current_tags)
            results['Tags'] = current_tags
        elif check_mode and tags:
            results['Tags'] = tags
        else:
            results['Tags'] = dict()
        results = convert_to_lower(results)

    return success, changed, err_msg, results


def delete_stream(client, stream_name, wait=False, wait_timeout=300,
                  check_mode=False):
    """Delete an Amazon Kinesis Stream.
    Args:
        client (botocore.client.EC2): Boto3 client.
        stream_name (str): The name of the kinesis stream.

    Kwargs:
        wait (bool): Wait until Stream is ACTIVE.
            default=False
        wait_timeout (int): How long to wait until this operation is considered failed.
            default=300
        check_mode (bool): This will pass DryRun as one of the parameters to the aws api.
            default=False

    Basic Usage:
        >>> client = boto3.client('kinesis')
        >>> stream_name = 'test-stream'
        >>> delete_stream(client, stream_name)

    Returns:
        Tuple (bool, bool, str, dict)
    """
    success = False
    changed = False
    err_msg = ''
    results = dict()
    stream_found, stream_msg, current_stream = (
        find_stream(client, stream_name, check_mode=check_mode)
    )
    if stream_found:
        success, err_msg = (
            stream_action(
                client, stream_name, action='delete', check_mode=check_mode
            )
        )
        if success:
            changed = True
            if wait:
                success, err_msg, results = (
                    wait_for_status(
                        client, stream_name, 'DELETING', wait_timeout,
                        check_mode=check_mode
                    )
                )
                err_msg = 'Stream {0} deleted successfully'.format(stream_name)
                if not success:
                    return success, True, err_msg, results
            else:
                err_msg = (
                    'Stream {0} is in the process of being deleted'
                    .format(stream_name)
                )
    else:
        success = True
        changed = False
        err_msg = 'Stream {0} does not exist'.format(stream_name)

    return success, changed, err_msg, results


def main():
    argument_spec = ec2_argument_spec()
    argument_spec.update(
        dict(
            name=dict(default=None, required=True),
            shards=dict(default=None, required=False, type='int'),
            retention_period=dict(default=None, required=False, type='int'),
            tags=dict(default=None, required=False, type='dict', aliases=['resource_tags']),
            wait=dict(default=True, required=False, type='bool'),
            wait_timeout=dict(default=300, required=False, type='int'),
            state=dict(default='present', choices=['present', 'absent']),
        )
    )
    module = AnsibleModule(
        argument_spec=argument_spec,
        supports_check_mode=True,
    )

    retention_period = module.params.get('retention_period')
    stream_name = module.params.get('name')
    shards = module.params.get('shards')
    state = module.params.get('state')
    tags = module.params.get('tags')
    wait = module.params.get('wait')
    wait_timeout = module.params.get('wait_timeout')

    if state == 'present' and not shards:
        module.fail_json(msg='Shards is required when state == present.')

    if retention_period:
        if retention_period < 24:
            module.fail_json(msg='Retention period can not be less than 24 hours.')

    if not HAS_BOTO3:
        module.fail_json(msg='boto3 is required.')

    check_mode = module.check_mode
    try:
        region, ec2_url, aws_connect_kwargs = (
            get_aws_connection_info(module, boto3=True)
        )
        client = (
            boto3_conn(
                module, conn_type='client', resource='kinesis',
                region=region, endpoint=ec2_url, **aws_connect_kwargs
            )
        )
    except botocore.exceptions.ClientError as e:
        err_msg = 'Boto3 Client Error - {0}'.format(str(e.msg))
        module.fail_json(
            success=False, changed=False, result={}, msg=err_msg
        )

    if state == 'present':
        success, changed, err_msg, results = (
            create_stream(
                client, stream_name, shards, retention_period, tags,
                wait, wait_timeout, check_mode
            )
        )
    elif state == 'absent':
        success, changed, err_msg, results = (
            delete_stream(client, stream_name, wait, wait_timeout, check_mode)
        )

    if success:
        module.exit_json(
            success=success, changed=changed, msg=err_msg, **results
        )
    else:
        module.fail_json(
            success=success, changed=changed, msg=err_msg, result=results
        )

# import module snippets
from ansible.module_utils.basic import *
from ansible.module_utils.ec2 import *

if __name__ == '__main__':
    main()