#!/usr/bin/python
#
# Copyright (c) 2018 Yunge Zhu, <yungez@microsoft.com>
#
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

from __future__ import absolute_import, division, print_function
__metaclass__ = type


DOCUMENTATION = '''
---
module: azure_rm_webapp
version_added: "0.1.2"
short_description: Manage Web App instances
description:
    - Create, update and delete instance of Web App.

options:
    resource_group:
        description:
            - Name of the resource group to which the resource belongs.
        required: True
        type: str
    name:
        description:
            - Unique name of the app to create or update. To create or update a deployment slot, use the {slot} parameter.
        required: True
        type: str

    location:
        description:
            - Resource location. If not set, location from the resource group will be used as default.
        type: str

    plan:
        description:
            - App service plan. Required for creation.
            - Can be name of existing app service plan in same resource group as web app.
            - Can be the resource ID of an existing app service plan. For example
              /subscriptions/<subs_id>/resourceGroups/<resource_group>/providers/Microsoft.Web/serverFarms/<plan_name>.
            - Can be a dict containing five parameters, defined below.
            - C(name), name of app service plan.
            - C(resource_group), resource group of the app service plan.
            - C(sku), SKU of app service plan, allowed values listed on U(https://azure.microsoft.com/en-us/pricing/details/app-service/linux/).
            - C(is_linux), whether or not the app service plan is Linux. defaults to C(False).
            - C(number_of_workers), number of workers for app service plan.
        type: raw

    frameworks:
        description:
            - Set of run time framework settings. Each setting is a dictionary.
            - See U(https://docs.microsoft.com/en-us/azure/app-service/app-service-web-overview) for more info.
        type: list
        elements: dict
        suboptions:
            name:
                description:
                    - Name of the framework.
                    - Supported framework list for Windows web app and Linux web app is different.
                    - Windows web apps support C(java), C(net_framework), C(php), C(python), and C(node) from June 2018.
                    - Windows web apps support multiple framework at the same time.
                    - Linux web apps support C(java), C(ruby), C(php), C(python), C(dotnetcore), and C(node) from June 2018.
                    - Linux web apps support only one framework.
                    - Java framework is mutually exclusive with others.
                type: str
                required: true
                choices:
                    - java
                    - net_framework
                    - php
                    - python
                    - ruby
                    - dotnetcore
                    - node
            version:
                description:
                    - Version of the framework. For Linux web app supported value, see U(https://aka.ms/linux-stacks) for more info.
                    - C(net_framework) supported value sample, C(v4.8) for .NET 4.8 and C(v3.5) for .NET 3.5.
                    - C(php) supported value sample, C(8.1), C(8.2).
                    - C(python) supported value sample, C(3.8), C(3.9), C(3.10), C(3.11), C(3.12).
                    - C(node) supported value sample, C(18), C(20).
                    - C(dotnetcore) supported value sample, C(8), C(7), C(6).
                    - C(ruby) supported value sample, C(2.3).
                    - C(java) supported value sample, C(21), C(17), C(11) and C(8).
                type: str
                required: true
            settings:
                description:
                    - List of settings of the framework.
                type: dict
                suboptions:
                    java_container:
                        description:
                            - Name of Java container.
                            - Supported only when I(frameworks=java). Sample values C(Tomcat), C(JavaSE), C(RedHat).
                        type: str
                        required: True
                    java_container_version:
                        description:
                            - Version of Java container.
                            - Supported only when I(frameworks=java).
                            - Sample values for C(Tomcat), C(8.5), C(9.0), C(10.0), C(10.1).
                        type: str
                        required: True

    container_settings:
        description:
            - Web app container settings.
        type: dict
        suboptions:
            name:
                description:
                    - Name of the container, for example C(imagename:tag).
                    - To create a multi-container app, the name should be 'COMPOSE|' or 'KUBE|' followed by base64 encoded configuration.
                type: str
                required: True
            registry_server_url:
                description:
                    - Container registry server URL, for example C(mydockerregistry.io).
                type: str
            registry_server_user:
                description:
                    - The container registry server user name.
                type: str
            registry_server_password:
                description:
                    - The container registry server password.
                type: str

    scm_type:
        description:
            - Repository type of deployment source, for example C(LocalGit), C(GitHub).
            - List of supported values maintained at U(https://docs.microsoft.com/en-us/rest/api/appservice/webapps/createorupdate#scmtype).
        type: str

    always_on:
        description:
            - Keeps the app loaded even when there's no traffic.
        type: bool

    http20_enabled:
        description:
            - Configures a web site to allow clients to connect over HTTP 2.0.
        type: bool

    min_tls_version:
        description:
            - The minimum TLS encryption version required for the app.
        type: str
        choices:
            - '1.0'
            - '1.1'
            - '1.2'

    ftps_state:
        description:
            - The state of the FTP/FTPS service.
        type: str
        choices:
            - AllAllowed
            - FtpsOnly
            - Disabled

    deployment_source:
        description:
            - Deployment source for git.
        type: dict
        suboptions:
            url:
                description:
                    - Repository url of deployment source.
                type: str

            branch:
                description:
                    - The branch name of the repository.
                type: str
    startup_file:
        description:
            - The web's startup file.
            - Used only for Linux web apps.
        type: str

    client_affinity_enabled:
        description:
            - Whether or not to send session affinity cookies, which route client requests in the same session to the same instance.
        type: bool
        default: True

    https_only:
        description:
            - Configures web site to accept only https requests.
        type: bool

    app_settings:
        description:
            - Configure web app application settings. Suboptions are in key value pair format.
        type: dict

    purge_app_settings:
        description:
            - Purge any existing application settings. Replace web app application settings with app_settings.
        type: bool
        default: False

    app_state:
        description:
            - Start/Stop/Restart the web app.
        type: str
        choices:
            - started
            - stopped
            - restarted
        default: started
    site_auth_settings:
        description:
            - Configuration settings for the Azure App Service Authentication / Authorization feature.
        type: dict
        suboptions:
            kind:
                description:
                    - Kind of resource.
                type: str
            enabled:
                description:
                    - Whether enable or disable the Authentication / Authorization feature for the current app.
                type: bool
            runtime_version:
                description:
                    - The RuntimeVersion of the Authentication / Authorization feature in use for the current app.
                type: str
            unauthenticated_client_action:
                description:
                    - The action to take when an unauthenticated client attempts to access the app.
                type: str
                choices:
                    - RedirectToLoginPage
                    - AllowAnonymous
            token_store_enabled:
                description:
                    - Whether to use App Service Token Store.
                type: bool
            allowed_external_redirect_urls:
                description:
                    - External URLs that can be redirected to as part of logging in or logging out of the app.
                    - Note that the query string part of the URL is ignored.
                type: list
                elements: str
            default_provider:
                description:
                    - The default authentication provider to use when multiple providers are configured.
                type: str
                choices:
                    - AzureActiveDirectory
                    - Facebook
                    - Google
                    - MicrosoftAccount
                    - Twitter
                    - Github
            token_refresh_extension_hours:
                description:
                    - The number of hours after session token expiration that a session token can be used to call the token refresh API.
                type: float
            client_id:
                description:
                    - The Client ID of this relying party application, known as the client_id.
                type: str
            client_secret:
                description:
                    - The Client Secret of this relying party application (in Azure Active Directory, this is also referred to as the Key).
                type: str
            client_secret_setting_name:
                description:
                    - The app setting name that contains the client secret of the relying party application.
                type: str
            client_secret_certificate_thumbprint:
                description:
                    - An alternative to the client secret, that is the thumbprint of a certificate used for signing purposes.
                    - This property acts as a replacement for the Client Secret. It is also optional.
                type: str
            issuer:
                description:
                    - The OpenID Connect Issuer URI that represents the entity which issues access tokens for this application.
                type: str
            allowed_audiences:
                description:
                    - Allowed audience values to consider when validating JWTs issued by Azure Active Directory.
                type: list
                elements: str
            aad_claims_authorization:
                description:
                    - Gets a JSON string containing the Azure AD Acl settings.
                type: str
            additional_login_params:
                description:
                    - Login parameters to send to the OpenID Connect authorization endpoint when a user logs in.
                    - Each parameter must be in the form "key=value".
                type: str
            google_client_id:
                description:
                    - The OpenID Connect Client ID for the Google web application.
                type: str
            google_client_secret:
                description:
                    - The client secret associated with the Google web application.
                type: str
            google_client_secret_setting_name:
                description:
                    - The app setting name that contains the client secret associated with the Google web application.
                type: str
            google_o_auth_scopes:
                description:
                    - The OAuth 2.0 scopes that will be requested as part of Google Sign-In authentication.
                    - This setting is optional. If not specified, "openid", "profile", and "email" are used as default scopes.
                type: list
                elements: str
            facebook_app_id:
                description:
                    - The App ID of the Facebook app used for login.
                type: str
            facebook_app_secret:
                description:
                    - The App Secret of the Facebook app used for Facebook Login.
                type: str
            facebook_app_secret_setting_name:
                description:
                    - The app setting name that contains the app secret used for Facebook Login.
                type: str
            facebook_o_auth_scopes:
                description:
                    - The OAuth 2.0 scopes that will be requested as part of Facebook for Facebook Login.
                type: list
                elements: str
            git_hub_client_id:
                description:
                    - The Client Id of the GitHub app used for login.
                type: str
            git_hub_client_secret:
                description:
                    - The Client Secret of the GitHub app used for Github Login.
                type: str
            git_hub_client_secret_setting_name:
                description:
                    - The app setting name that contains the client secret of the Github app used for GitHub Login.
                type: str
            git_hub_o_auth_scopes:
                description:
                    - The OAuth 2.0 scopes that will be requested as part of GitHub Login authentication.
                    - This setting is optional.
                type: list
                elements: str
            twitter_consumer_key:
                description:
                    - The OAuth 1.0a consumer key of the Twitter application used for sign-in.
                type: str
            twitter_consumer_secret:
                description:
                    - The OAuth 1.0a consumer secret of the Twitter application used for sign-in.
                    - This setting is required for enabling Twitter Sign-In.
                type: str
            twitter_consumer_secret_setting_name:
                description:
                    - The app setting name that contains the OAuth 1.0a consumer secret of the Twitter application used for sign-in.
                type: str
            microsoft_account_client_id:
                description:
                    - The OAuth 2.0 client ID that was created for the app used for authentication.
                    - This setting is required for enabling Microsoft Account authentication.
                type: str
            microsoft_account_client_secret:
                description:
                    - The OAuth 2.0 client secret that was created for the app used for authentication.
                type: str
            microsoft_account_client_secret_setting_name:
                description:
                    - The app setting name containing the OAuth 2.0 client secret that was created for the app used for authentication.
                type: str
            microsoft_account_o_auth_scopes:
                description:
                    - The OAuth 2.0 scopes that will be requested as part of Microsoft Account authentication.
                type: list
                elements: str
            is_auth_from_file:
                description:
                    - If I(is_auth_from_file=true), the auth config settings should be read from a file.
                type: str
                choices:
                    - 'true'
                    - 'false'
            auth_file_path:
                description:
                    - The path of the config file containing auth settings.
                    - If the path is relative, base will the site's root directory.
                type: str
            config_version:
                description:
                    - The ConfigVersion of the Authentication / Authorization feature in use for the current app.
                    - The setting in this value can control the behavior of the control plane for Authentication / Authorization.
                type: str
    state:
        description:
            - State of the Web App.
            - Use C(present) to create or update a Web App and C(absent) to delete it.
        default: present
        type: str
        choices:
            - absent
            - present

extends_documentation_fragment:
    - azure.azcollection.azure
    - azure.azcollection.azure_tags
    - azure.azcollection.azure_identity_multiple

author:
    - Yunge Zhu (@yungezz)

'''

EXAMPLES = '''
- name: Create a windows web app with non-exist app service plan
  azure_rm_webapp:
    resource_group: myResourceGroup
    name: myWinWebapp
    plan:
      resource_group: myAppServicePlan_rg
      name: myAppServicePlan
      is_linux: false
      sku: S1

- name: Create a docker web app with some app settings, with docker image
  azure_rm_webapp:
    resource_group: myResourceGroup
    name: myDockerWebapp
    plan:
      resource_group: myAppServicePlan_rg
      name: myAppServicePlan
      is_linux: true
      sku: S1
      number_of_workers: 2
    app_settings:
      testkey: testvalue
      testkey2: testvalue2
    container_settings:
      name: ansible/ansible:ubuntu1404

- name: Create a docker web app with private acr registry
  azure_rm_webapp:
    resource_group: myResourceGroup
    name: myDockerWebapp
    plan: myAppServicePlan
    app_settings:
      testkey: testvalue
    container_settings:
      name: ansible/ubuntu1404
      registry_server_url: myregistry.io
      registry_server_user: user
      registry_server_password: "{{ password }}"

- name: Create a multi-container web app
  azure_rm_webapp:
    resource_group: myResourceGroup
    name: myMultiContainerWebapp
    plan: myAppServicePlan
    app_settings:
      testkey: testvalue
    container_settings:
      name: "COMPOSE|{{ lookup('file', 'docker-compose.yml') | b64encode }}"

- name: Create a linux web app with Node 6.6 framework
  azure_rm_webapp:
    resource_group: myResourceGroup
    name: myLinuxWebapp
    plan:
      resource_group: myAppServicePlan_rg
      name: myAppServicePlan
    app_settings:
      testkey: testvalue
    frameworks:
      - name: "node"
        version: "18"

- name: Create a windows web app with node, php
  azure_rm_webapp:
    resource_group: myResourceGroup
    name: myWinWebapp
    plan:
      resource_group: myAppServicePlan_rg
      name: myAppServicePlan
    app_settings:
      testkey: testvalue
    frameworks:
      - name: "node"
        version: 18
      - name: "php"
        version: 8.2

- name: Create a stage deployment slot for an existing web app
  azure_rm_webapp:
    resource_group: myResourceGroup
    name: myWebapp/slots/stage
    plan:
      resource_group: myAppServicePlan_rg
      name: myAppServicePlan
    app_settings:
      testkey:testvalue

- name: Create a linux web app with java framework
  azure_rm_webapp:
    resource_group: myResourceGroup
    name: myLinuxWebapp
    plan:
      resource_group: myAppServicePlan_rg
      name: myAppServicePlan
    app_settings:
      testkey: testvalue
    frameworks:
      - name: "java"
        version: "8"
        settings:
          java_container: "Tomcat"
          java_container_version: "8.5"

- name: Create a windows web app with site_auth_settings
  azure_rm_webapp:
    resource_group: myResourceGroup
    name: myWindowWebapp
    site_auth_settings:
      client_id: 'xxxxxxxx-xxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx'
      default_provider: 'MicrosoftAccount'
      runtime_version: '-2'
      token_refresh_extension_hours: 120
      unauthenticated_client_action: 'RedirectToLoginPage'
      client_secret: 'xxxxxxxx-xxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx'
      token_store_enabled: false
      enabled: true
      is_auth_from_file: false
    plan:
      resource_group: myResourceGroup
      name: myLinuxwebapp
      is_linux: false
      sku: S1

- name: Create a linux web app with python framework
  azure_rm_webapp:
    resource_group: myResourceGroup
    name: myLinuxWebapp
    plan:
      resource_group: myAppServicePlan_rg
      name: myAppServicePlan
    app_settings:
      testkey: testvalue
    frameworks:
      - name: "python"
        version: "3.10"
'''

RETURN = '''
id:
    description:
        - ID of current web app.
    returned: always
    type: str
    sample: "/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourceGroups/myResourceGroup/providers/Microsoft.Web/sites/myWebApp"
'''

from ansible_collections.azure.azcollection.plugins.module_utils.azure_rm_common_ext import AzureRMModuleBaseExt

try:
    from azure.core.exceptions import ResourceNotFoundError
    from azure.core.polling import LROPoller
    from azure.core.exceptions import HttpResponseError
    from azure.mgmt.web.models import Site, AppServicePlan, SkuDescription, NameValuePair, SiteSourceControl, \
        StringDictionary, ManagedServiceIdentity, UserAssignedIdentity
except ImportError:
    # This is handled in azure_rm_common
    pass

container_settings_spec = dict(
    name=dict(type='str', required=True),
    registry_server_url=dict(type='str'),
    registry_server_user=dict(type='str'),
    registry_server_password=dict(type='str', no_log=True)
)

deployment_source_spec = dict(
    url=dict(type='str'),
    branch=dict(type='str')
)


framework_settings_spec = dict(
    java_container=dict(type='str', required=True),
    java_container_version=dict(type='str', required=True)
)


framework_spec = dict(
    name=dict(
        type='str',
        required=True,
        choices=['net_framework', 'java', 'php', 'node', 'python', 'dotnetcore', 'ruby']),
    version=dict(type='str', required=True),
    settings=dict(type='dict', options=framework_settings_spec)
)


site_auth_settings_spec = dict(
    kind=dict(type='str'),
    enabled=dict(type='bool'),
    runtime_version=dict(type='str'),
    unauthenticated_client_action=dict(type='str', choices=["RedirectToLoginPage", "AllowAnonymous"]),
    token_store_enabled=dict(type='bool'),
    allowed_external_redirect_urls=dict(type='list', elements='str'),
    default_provider=dict(type='str', choices=["Facebook", "Google", "MicrosoftAccount", "Twitter", "Github", "AzureActiveDirectory"]),
    token_refresh_extension_hours=dict(type='float', no_log=True),
    client_id=dict(type='str'),
    client_secret=dict(type='str', no_log=True),
    client_secret_setting_name=dict(type='str'),
    client_secret_certificate_thumbprint=dict(type='str', no_log=True),
    issuer=dict(type='str'),
    allowed_audiences=dict(type='list', elements='str'),
    additional_login_params=dict(type='str'),
    aad_claims_authorization=dict(type='str'),
    google_client_id=dict(type='str'),
    google_client_secret=dict(type='str', no_log=True),
    google_client_secret_setting_name=dict(type='str'),
    google_o_auth_scopes=dict(type='list', elements='str'),
    facebook_app_id=dict(type='str'),
    facebook_app_secret=dict(type='str', no_log=True),
    facebook_app_secret_setting_name=dict(type='str'),
    facebook_o_auth_scopes=dict(type='list', elements='str'),
    git_hub_client_id=dict(type='str'),
    git_hub_client_secret=dict(type='str', no_log=True),
    git_hub_client_secret_setting_name=dict(type='str'),
    git_hub_o_auth_scopes=dict(type='list', elements='str'),
    twitter_consumer_key=dict(type='str', no_log=True),
    twitter_consumer_secret=dict(type='str', no_log=True),
    twitter_consumer_secret_setting_name=dict(type='str'),
    microsoft_account_client_id=dict(type='str'),
    microsoft_account_client_secret=dict(type='str', no_log=True),
    microsoft_account_client_secret_setting_name=dict(type='str'),
    microsoft_account_o_auth_scopes=dict(type='list', elements='str'),
    is_auth_from_file=dict(type='str', choices=['true', 'false']),
    auth_file_path=dict(type='str'),
    config_version=dict(type='str')
)


def _normalize_sku(sku):
    if sku is None:
        return sku

    sku = sku.upper()
    if sku == 'FREE':
        return 'F1'
    elif sku == 'SHARED':
        return 'D1'
    return sku


def get_sku_name(tier):
    tier = tier.upper()
    if tier == 'F1' or tier == "FREE":
        return 'FREE'
    elif tier == 'D1' or tier == "SHARED":
        return 'SHARED'
    elif tier in ['B1', 'B2', 'B3', 'BASIC']:
        return 'BASIC'
    elif tier in ['S1', 'S2', 'S3']:
        return 'STANDARD'
    elif tier in ['P1', 'P2', 'P3']:
        return 'PREMIUM'
    elif tier in ['P1V2', 'P2V2', 'P3V2']:
        return 'PREMIUMV2'
    else:
        return None


def appserviceplan_to_dict(plan):
    return dict(
        id=plan.id,
        name=plan.name,
        kind=plan.kind,
        location=plan.location,
        reserved=plan.reserved,
        is_linux=plan.reserved,
        provisioning_state=plan.provisioning_state,
        tags=plan.tags if plan.tags else None
    )


def webapp_to_dict(webapp):
    return dict(
        id=webapp.id,
        name=webapp.name,
        location=webapp.location,
        client_cert_enabled=webapp.client_cert_enabled,
        enabled=webapp.enabled,
        reserved=webapp.reserved,
        client_affinity_enabled=webapp.client_affinity_enabled,
        server_farm_id=webapp.server_farm_id,
        host_names_disabled=webapp.host_names_disabled,
        https_only=webapp.https_only if hasattr(webapp, 'https_only') else None,
        skip_custom_domain_verification=webapp.skip_custom_domain_verification if hasattr(webapp, 'skip_custom_domain_verification') else None,
        ttl_in_seconds=webapp.ttl_in_seconds if hasattr(webapp, 'ttl_in_seconds') else None,
        state=webapp.state,
        identity=webapp.identity.as_dict() if webapp.identity else None,
        tags=webapp.tags if webapp.tags else None
    )


class Actions:
    CreateOrUpdate, UpdateAppSettings, UpdateAuthSettings, Delete = range(4)


class AzureRMWebApps(AzureRMModuleBaseExt):
    """Configuration class for an Azure RM Web App resource"""

    def __init__(self):
        self.module_arg_spec = dict(
            resource_group=dict(
                type='str',
                required=True
            ),
            name=dict(
                type='str',
                required=True
            ),
            location=dict(
                type='str'
            ),
            plan=dict(
                type='raw'
            ),
            frameworks=dict(
                type='list',
                elements='dict',
                options=framework_spec
            ),
            container_settings=dict(
                type='dict',
                options=container_settings_spec
            ),
            scm_type=dict(
                type='str',
            ),
            always_on=dict(
                type='bool',
            ),
            http20_enabled=dict(
                type='bool',
            ),
            min_tls_version=dict(
                type='str',
                choices=['1.0', '1.1', '1.2'],
            ),
            ftps_state=dict(
                type='str',
                choices=['AllAllowed', 'FtpsOnly', 'Disabled'],
            ),
            deployment_source=dict(
                type='dict',
                options=deployment_source_spec
            ),
            startup_file=dict(
                type='str'
            ),
            client_affinity_enabled=dict(
                type='bool',
                default=True
            ),
            https_only=dict(
                type='bool'
            ),
            app_settings=dict(
                type='dict'
            ),
            purge_app_settings=dict(
                type='bool',
                default=False
            ),
            app_state=dict(
                type='str',
                choices=['started', 'stopped', 'restarted'],
                default='started'
            ),
            site_auth_settings=dict(
                type='dict',
                options=site_auth_settings_spec
            ),
            identity=dict(
                type='dict',
                options=self.managed_identity_multiple_spec
            ),
            state=dict(
                type='str',
                default='present',
                choices=['present', 'absent']
            )
        )

        mutually_exclusive = [['container_settings', 'frameworks']]

        self.resource_group = None
        self.name = None
        self.location = None

        # update in create_or_update as parameters
        self.client_affinity_enabled = True
        self.https_only = None

        self.tags = None

        # Managed Identity
        self.identity = None

        # site config, e.g app settings, ssl
        self.site_config = dict()
        self.app_settings = dict()
        self.app_settings_strDic = None
        self.site_auth_settings = None

        # app service plan
        self.plan = None

        # siteSourceControl
        self.deployment_source = dict()

        # site, used at level creation, or update. e.g windows/linux, client_affinity etc first level args
        self.site = None

        # property for internal usage, not used for sdk
        self.container_settings = None

        self.purge_app_settings = False
        self.app_state = 'started'

        self.results = dict(
            changed=False,
            id=None,
        )
        self.state = None
        self.to_do = []

        self.frameworks = None

        # set site_config value from kwargs
        self.site_config_updatable_properties = ["net_framework_version",
                                                 "java_version",
                                                 "php_version",
                                                 "python_version",
                                                 "scm_type",
                                                 "always_on",
                                                 "http20_enabled",
                                                 "min_tls_version",
                                                 "ftps_state"]

        # updatable_properties
        self.updatable_properties = ["client_affinity_enabled",
                                     "https_only"]

        self.supported_linux_frameworks = ['ruby', 'php', 'python', 'dotnetcore', 'node', 'java']
        self.supported_windows_frameworks = ['net_framework', 'php', 'python', 'node', 'java', 'dotnetcore']

        self._managed_identity = None

        super(AzureRMWebApps, self).__init__(derived_arg_spec=self.module_arg_spec,
                                             mutually_exclusive=mutually_exclusive,
                                             supports_check_mode=True,
                                             supports_tags=True)

    @property
    def managed_identity(self):
        if not self._managed_identity:
            self._managed_identity = {"identity": ManagedServiceIdentity,
                                      "user_assigned": UserAssignedIdentity
                                      }
        return self._managed_identity

    def exec_module(self, **kwargs):
        """Main module execution method"""

        for key in list(self.module_arg_spec.keys()) + ['tags']:
            if hasattr(self, key):
                setattr(self, key, kwargs[key])
            elif kwargs[key] is not None:
                if key in ["scm_type", "always_on", "http20_enabled", "min_tls_version", "ftps_state"]:
                    self.site_config[key] = kwargs[key]

        old_response = None
        response = None
        to_be_updated = False

        # set location
        resource_group = self.get_resource_group(self.resource_group)
        if not self.location:
            self.location = resource_group.location

        # get existing web app
        old_response = self.get_webapp()

        if old_response:
            self.results['id'] = old_response['id']
            self.results['site_auth_settings'] = self.get_auth_settings()

        if self.state == 'present':
            if not self.plan and not old_response:
                self.fail("Please specify plan for newly created web app.")

            if not self.plan:
                self.plan = old_response['server_farm_id']

            self.plan = self.parse_resource_to_dict(self.plan)

            # get app service plan
            is_linux = False
            old_plan = self.get_app_service_plan()
            if old_plan:
                is_linux = old_plan['reserved']
            else:
                is_linux = self.plan['is_linux'] if 'is_linux' in self.plan else False

            if self.frameworks:
                # java is mutually exclusive with other frameworks
                if len(self.frameworks) > 1 and any(f['name'] == 'java' for f in self.frameworks):
                    self.fail('Java is mutually exclusive with other frameworks.')

                if is_linux:
                    if len(self.frameworks) != 1:
                        self.fail('Can specify one framework only for Linux web app.')

                    if self.frameworks[0]['name'] not in self.supported_linux_frameworks:
                        self.fail('Unsupported framework {0} for Linux web app.'.format(self.frameworks[0]['name']))

                    self.site_config['linux_fx_version'] = (self.frameworks[0]['name'] + '|' + self.frameworks[0]['version']).upper()

                    if self.frameworks[0]['name'] == 'java':
                        if self.frameworks[0]['version'] not in ['8', '11', '17', '21']:
                            self.fail("Linux web app only supports java 8, 11, 17 and 21.")
                        if self.frameworks[0]['settings'] and self.frameworks[0]['settings']['java_container'].lower() != 'tomcat':
                            self.fail("Linux web app only supports tomcat container.")

                        if self.frameworks[0]['settings'] and self.frameworks[0]['settings']['java_container'].lower() == 'tomcat':
                            self.site_config['linux_fx_version'] = 'TOMCAT|' + self.frameworks[0]['settings']['java_container_version'] + '-jre8'
                        else:
                            self.site_config['linux_fx_version'] = 'JAVA|{0}-jre{0}'.format(self.frameworks[0]['version'])
                else:
                    for fx in self.frameworks:
                        if fx.get('name') not in self.supported_windows_frameworks:
                            self.fail('Unsupported framework {0} for Windows web app.'.format(fx.get('name')))
                        else:
                            self.site_config[fx.get('name') + '_version'] = fx.get('version')

                        if 'settings' in fx and fx['settings'] is not None:
                            for key, value in fx['settings'].items():
                                self.site_config[key] = value

            if not self.app_settings:
                self.app_settings = dict()

            if self.container_settings:
                linux_fx_version = 'DOCKER|'

                if self.container_settings.get('registry_server_url'):
                    self.app_settings['DOCKER_REGISTRY_SERVER_URL'] = 'https://' + self.container_settings['registry_server_url']

                    linux_fx_version += self.container_settings['registry_server_url'] + '/'

                linux_fx_version += self.container_settings['name']

                # Use given name as is if it starts with allowed values of multi-container application
                if self.container_settings['name'].startswith('COMPOSE|') or self.container_settings['name'].startswith('KUBE|'):
                    linux_fx_version = self.container_settings['name']

                self.site_config['linux_fx_version'] = linux_fx_version

                if self.container_settings.get('registry_server_user'):
                    self.app_settings['DOCKER_REGISTRY_SERVER_USERNAME'] = self.container_settings['registry_server_user']

                if self.container_settings.get('registry_server_password'):
                    self.app_settings['DOCKER_REGISTRY_SERVER_PASSWORD'] = self.container_settings['registry_server_password']

            # init site
            self.site = Site(location=self.location, site_config=self.site_config)

            if self.https_only is not None:
                self.site.https_only = self.https_only

            self.site.client_affinity_enabled = self.client_affinity_enabled

            # check if the web app already present in the resource group
            if not old_response:
                self.log("Web App instance doesn't exist")

                to_be_updated = True
                self.to_do.append(Actions.CreateOrUpdate)
                if self.site_auth_settings is not None:
                    self.to_do.append(Actions.UpdateAuthSettings)
                self.site.tags = self.tags

                if self.identity:
                    update_identity, self.site.identity = self.update_managed_identity(new_identity=self.identity)

                # service plan is required for creation
                if not self.plan:
                    self.fail("Please specify app service plan in plan parameter.")

                if not old_plan:
                    # no existing service plan, create one
                    if (not self.plan.get('name') or not self.plan.get('sku')):
                        self.fail('Please specify name, is_linux, sku in plan')

                    if 'location' not in self.plan:
                        plan_resource_group = self.get_resource_group(self.plan['resource_group'])
                        self.plan['location'] = plan_resource_group.location

                    old_plan = self.create_app_service_plan()

                self.site.server_farm_id = old_plan['id']

                # if linux, setup startup_file
                if old_plan['is_linux']:
                    if hasattr(self, 'startup_file'):
                        self.site_config['app_command_line'] = self.startup_file

                # set app setting
                if self.app_settings:
                    app_settings = []
                    for key in self.app_settings.keys():
                        app_settings.append(NameValuePair(name=key, value=self.app_settings[key]))

                    self.site_config['app_settings'] = app_settings
            else:
                # existing web app, do update
                self.log("Web App instance already exists")

                self.log('Result: {0}'.format(old_response))

                if self.identity:
                    update_identity, self.site.identity = self.update_managed_identity(new_identity=self.identity,
                                                                                       curr_identity=old_response.get('identity', None))

                    if update_identity:
                        to_be_updated = True
                        self.to_do.append(Actions.CreateOrUpdate)

                update_tags, self.site.tags = self.update_tags(old_response.get('tags', None))

                if update_tags:
                    to_be_updated = True
                    self.to_do.append(Actions.CreateOrUpdate)

                # check if root level property changed
                if self.is_updatable_property_changed(old_response):
                    to_be_updated = True
                    self.to_do.append(Actions.CreateOrUpdate)

                # check if site_config changed
                old_config = self.get_webapp_configuration()

                if self.is_site_config_changed(old_config):
                    to_be_updated = True
                    self.to_do.append(Actions.CreateOrUpdate)

                # check if linux_fx_version changed
                if old_config.linux_fx_version != self.site_config.get('linux_fx_version', ''):
                    to_be_updated = True
                    self.to_do.append(Actions.CreateOrUpdate)

                self.app_settings_strDic = self.list_app_settings()

                # purge existing app_settings:
                if self.purge_app_settings:
                    to_be_updated = True
                    self.app_settings_strDic = dict()
                    self.to_do.append(Actions.UpdateAppSettings)

                # check if app settings changed
                if self.purge_app_settings or self.is_app_settings_changed():
                    to_be_updated = True
                    self.to_do.append(Actions.UpdateAppSettings)

                    if self.app_settings:
                        for key in self.app_settings.keys():
                            self.app_settings_strDic[key] = self.app_settings[key]

                if self.site_auth_settings is not None:
                    result = dict(compare=[])
                    if not self.default_compare({}, self.site_auth_settings, self.results['site_auth_settings'], '', dict(compare=[])):
                        to_be_updated = True
                        self.to_do.append(Actions.UpdateAuthSettings)

        elif self.state == 'absent':
            if old_response:
                self.log("Delete Web App instance")
                self.results['changed'] = True

                if self.check_mode:
                    return self.results

                self.delete_webapp()

                self.log('Web App instance deleted')

            else:
                self.log("Web app {0} not exists.".format(self.name))

        if to_be_updated:
            self.log('Need to Create/Update web app')
            self.results['changed'] = True

            if self.check_mode:
                return self.results

            if Actions.CreateOrUpdate in self.to_do:
                response = self.create_update_webapp()

                self.results['id'] = response['id']

            if Actions.UpdateAppSettings in self.to_do:
                update_response = self.update_app_settings()
                self.results['id'] = update_response.id

            if Actions.UpdateAuthSettings in self.to_do:
                auth_settings = self.update_auth_settings(self.site_auth_settings)
                self.results['site_auth_settings'] = auth_settings
            else:
                self.results['site_auth_settings'] = self.get_auth_settings()

        webapp = None
        if old_response:
            webapp = old_response
        if response:
            webapp = response

        if webapp:
            if (webapp['state'] != 'Stopped' and self.app_state == 'stopped') or \
               (webapp['state'] != 'Running' and self.app_state == 'started') or \
               self.app_state == 'restarted':

                self.results['changed'] = True
                if self.check_mode:
                    return self.results

                self.set_webapp_state(self.app_state)

        return self.results

    # compare existing web app with input, determine weather it's update operation
    def is_updatable_property_changed(self, existing_webapp):
        for property_name in self.updatable_properties:
            if hasattr(self, property_name) and getattr(self, property_name) is not None and \
                    getattr(self, property_name) != existing_webapp.get(property_name, None):
                return True

        return False

    # compare xxx_version
    def is_site_config_changed(self, existing_config):
        for updatable_property in self.site_config_updatable_properties:
            if updatable_property in self.site_config:
                if not getattr(existing_config, updatable_property) or \
                        str(getattr(existing_config, updatable_property)).upper() != str(self.site_config.get(updatable_property)).upper():
                    return True

        return False

    # comparing existing app setting with input, determine whether it's changed
    def is_app_settings_changed(self):
        if self.app_settings:
            if self.app_settings_strDic:
                for key in self.app_settings.keys():
                    if self.app_settings[key] != self.app_settings_strDic.get(key, None):
                        return True
            else:
                return True
        return False

    # comparing deployment source with input, determine wheather it's changed
    def is_deployment_source_changed(self, existing_webapp):
        if self.deployment_source:
            if self.deployment_source.get('url') \
                    and self.deployment_source['url'] != existing_webapp.get('site_source_control')['url']:
                return True

            if self.deployment_source.get('branch') \
                    and self.deployment_source['branch'] != existing_webapp.get('site_source_control')['branch']:
                return True

        return False

    def create_update_webapp(self):
        '''
        Creates or updates Web App with the specified configuration.

        :return: deserialized Web App instance state dictionary
        '''
        self.log(
            "Creating / Updating the Web App instance {0}".format(self.name))

        try:
            response = self.web_client.web_apps.begin_create_or_update(resource_group_name=self.resource_group,
                                                                       name=self.name,
                                                                       site_envelope=self.site)
            if isinstance(response, LROPoller):
                response = self.get_poller_result(response)

        except Exception as exc:
            self.log('Error attempting to create the Web App instance.')
            self.fail("Error creating the Web App instance: {0}".format(str(exc)))
        return webapp_to_dict(response)

    def delete_webapp(self):
        '''
        Deletes specified Web App instance in the specified subscription and resource group.

        :return: True
        '''
        self.log("Deleting the Web App instance {0}".format(self.name))
        try:
            self.web_client.web_apps.delete(resource_group_name=self.resource_group, name=self.name)
        except Exception as e:
            self.log('Error attempting to delete the Web App instance.')
            self.fail("Error deleting the Web App instance: {0}".format(str(e)))

        return True

    def get_webapp(self):
        '''
        Gets the properties of the specified Web App.

        :return: deserialized Web App instance state dictionary
        '''
        self.log(
            "Checking if the Web App instance {0} is present".format(self.name))

        response = None

        try:
            response = self.web_client.web_apps.get(resource_group_name=self.resource_group, name=self.name)

            # Newer SDK versions (0.40.0+) seem to return None if it doesn't exist instead of raising error
            if response is not None:
                self.log("Response : {0}".format(response))
                self.log("Web App instance : {0} found".format(response.name))
                return webapp_to_dict(response)

        except ResourceNotFoundError:
            pass

        self.log("Didn't find web app {0} in resource group {1}".format(self.name, self.resource_group))

        return False

    def get_app_service_plan(self):
        '''
        Gets app service plan
        :return: deserialized app service plan dictionary
        '''
        self.log("Get App Service Plan {0}".format(self.plan['name']))

        try:
            response = self.web_client.app_service_plans.get(
                resource_group_name=self.plan['resource_group'],
                name=self.plan['name'])

            # Newer SDK versions (0.40.0+) seem to return None if it doesn't exist instead of raising error
            if response is not None:
                self.log("Response : {0}".format(response))
                self.log("App Service Plan : {0} found".format(response.name))

                return appserviceplan_to_dict(response)
        except ResourceNotFoundError:
            pass

        self.log("Didn't find app service plan {0} in resource group {1}".format(
            self.plan['name'], self.plan['resource_group']))

        return False

    def create_app_service_plan(self):
        '''
        Creates app service plan
        :return: deserialized app service plan dictionary
        '''
        self.log("Create App Service Plan {0}".format(self.plan['name']))

        try:
            # normalize sku
            sku = _normalize_sku(self.plan['sku'])

            sku_def = SkuDescription(tier=get_sku_name(
                sku), name=sku, capacity=(self.plan.get('number_of_workers', None)))
            plan_def = AppServicePlan(
                location=self.plan['location'], app_service_plan_name=self.plan['name'], sku=sku_def, reserved=(self.plan.get('is_linux', None)))

            poller = self.web_client.app_service_plans.begin_create_or_update(
                resource_group_name=self.plan['resource_group'], name=self.plan['name'], app_service_plan=plan_def)

            if isinstance(poller, LROPoller):
                response = self.get_poller_result(poller)

            self.log("Response : {0}".format(response))

            return appserviceplan_to_dict(response)
        except Exception as ex:
            self.fail("Failed to create app service plan {0} in resource group {1}: {2}".format(
                self.plan['name'], self.plan['resource_group'], str(ex)))

    def list_app_settings(self):
        '''
        List application settings
        :return: deserialized list response
        '''
        self.log("List application setting")

        try:
            response = self.web_client.web_apps.list_application_settings(resource_group_name=self.resource_group, name=self.name)
            self.log("Response : {0}".format(response))

            return response.properties
        except Exception as ex:
            self.fail("Failed to list application settings for web app {0} in resource group {1}: {2}".format(
                self.name, self.resource_group, str(ex)))

    def update_auth_settings(self, body):
        '''
        Update web app auth settings
        :return: deserialized updating response
        '''
        self.log("Update web app auth settings")

        try:
            response = self.web_client.web_apps.update_auth_settings(self.resource_group, self.name, body)
            self.log("Response : {0}".format(response))
            return response.as_dict()
        except HttpResponseError as ex:
            self.fail("Failed to update web app auth settings for web app {0} in resource group {1}: {2}".format(
                self.name, self.resource_group, str(ex)))

    def get_auth_settings(self):
        '''
        Get the web app auth settings
        :return: deserialized updating response
        '''
        self.log("Get the web app auth settings")

        try:
            response = self.web_client.web_apps.get_auth_settings(self.resource_group, self.name)
            self.log("Response : {0}".format(response))
            return response.as_dict()
        except HttpResponseError as ex:
            self.log("Failed to Get web app auth settings for web app {0} in resource group {1}: {2}".format(
                     self.name, self.resource_group, str(ex)))

    def update_app_settings(self):
        '''
        Update application settings
        :return: deserialized updating response
        '''
        self.log("Update application setting")

        try:
            settings = StringDictionary(
                properties=self.app_settings_strDic
            )
            response = self.web_client.web_apps.update_application_settings(
                resource_group_name=self.resource_group, name=self.name, app_settings=settings)
            self.log("Response : {0}".format(response))
            return response
        except HttpResponseError as ex:
            self.fail("Failed to update application settings for web app {0} in resource group {1}: {2}".format(
                self.name, self.resource_group, str(ex)))

    def create_or_update_source_control(self):
        '''
        Update site source control
        :return: deserialized updating response
        '''
        self.log("Update site source control")

        if self.deployment_source is None:
            return False

        self.deployment_source['is_manual_integration'] = False
        self.deployment_source['is_mercurial'] = False

        try:
            site_source_control = SiteSourceControl(
                repo_url=self.deployment_source.get('url'),
                branch=self.deployment_source.get('branch')
            )
            response = self.web_client.web_apps.begin_create_or_update_source_control(
                resource_group_name=self.resource_group, name=self.name, site_source_control=site_source_control)
            self.log("Response : {0}".format(response))

            return response.as_dict()
        except Exception:
            self.fail("Failed to update site source control for web app {0} in resource group {1}".format(
                self.name, self.resource_group))

    def get_webapp_configuration(self):
        '''
        Get  web app configuration
        :return: deserialized  web app configuration response
        '''
        self.log("Get web app configuration")

        try:
            response = self.web_client.web_apps.get_configuration(
                resource_group_name=self.resource_group, name=self.name)
            self.log("Response : {0}".format(response))

            return response
        except ResourceNotFoundError as ex:
            self.log("Failed to get configuration for web app {0} in resource group {1}: {2}".format(
                self.name, self.resource_group, str(ex)))

            return False

    def set_webapp_state(self, appstate):
        '''
        Start/stop/restart web app
        :return: deserialized updating response
        '''
        try:
            if appstate == 'started':
                response = self.web_client.web_apps.start(resource_group_name=self.resource_group, name=self.name)
            elif appstate == 'stopped':
                response = self.web_client.web_apps.stop(resource_group_name=self.resource_group, name=self.name)
            elif appstate == 'restarted':
                response = self.web_client.web_apps.restart(resource_group_name=self.resource_group, name=self.name)
            else:
                self.fail("Invalid web app state {0}".format(appstate))

            self.log("Response : {0}".format(response))

            return response
        except Exception as ex:
            request_id = ex.request_id if ex.request_id else ''
            self.log("Failed to {0} web app {1} in resource group {2}, request_id {3} - {4}".format(
                appstate, self.name, self.resource_group, request_id, str(ex)))


def main():
    """Main execution"""
    AzureRMWebApps()


if __name__ == '__main__':
    main()
