#!/usr/bin/python
#
# Copyright (c) 2016 Matt Davis, <mdavis@ansible.com>
#                    Chris Houseknecht, <house@redhat.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_storageblob
short_description: Manage blob containers and blob objects
version_added: "0.0.1"
description:
    - Create, update and delete blob containers and blob objects.
    - Use to upload a file and store it as a blob object, or download a blob object to a file(upload and download mode)
    - Use to upload a batch of files under a given directory(batch upload mode)
    - In the batch upload mode, the existing blob object will be overwritten if a blob object with the same name is to be created.
    - the module can work exclusively in three modes, when C(batch_upload_src) is set, it is working in batch upload mode;
      when C(src) is set, it is working in upload mode and when C(dst) is set, it is working in dowload mode.
options:
    auth_mode:
        description:
            - The mode in which to run the command. C(login) mode will directly use your login credentials for the authentication.
            - The legacy C(key) mode will attempt to query for an account key if no authentication parameters for the account are provided.
            - Can also be set via the environment variable C(AZURE_STORAGE_AUTH_MODE).
        default: key
        type: str
        choices:
            - key
            - login
        version_added: "1.19.0"
    storage_account_name:
        description:
            - Name of the storage account to use.
        required: true
        type: str
        aliases:
            - account_name
            - storage_account
    blob:
        description:
            - Name of a blob object within the container.
        aliases:
            - blob_name
        type: str
    blob_type:
        description:
            - Type of blob object.
        default: block
        type: str
        choices:
            - block
            - page
        version_added: "0.0.1"
    container:
        description:
            - Name of a blob container within the storage account.
        required: true
        type: str
        aliases:
            - container_name
    content_type:
        description:
            - Set the blob content-type header. For example C(image/png).
        type: str
    cache_control:
        description:
            - Set the blob cache-control header.
        type: str
    content_disposition:
        description:
            - Set the blob content-disposition header.
        type: str
    content_encoding:
        description:
            - Set the blob encoding header.
        type: str
    content_language:
        description:
            - Set the blob content-language header.
        type: str
    content_md5:
        description:
            - Set the blob md5 hash value.
        type: str
    dest:
        description:
            - Destination file path. Use with state C(present) to download a blob.
        aliases:
            - destination
        type: path
    force:
        description:
            - Overwrite existing blob or file when uploading or downloading. Force deletion of a container that contains blobs.
        type: bool
        default: no
    resource_group:
        description:
            - Name of the resource group to use.
        required: true
        type: str
        aliases:
            - resource_group_name
    src:
        description:
            - Source file path. Use with state C(present) to upload a blob.
        type: str
        aliases:
            - source
    batch_upload_src:
        description:
            - Batch upload source directory. Use with state C(present) to upload batch of files under the directory.
        type: path
    batch_upload_dst:
        description:
            - Base directory in container when upload batch of files.
        type: path
    state:
        description:
            - State of a container or blob.
            - Use state C(absent) with a container value only to delete a container. Include a blob value to remove
              a specific blob. A container will not be deleted, if it contains blobs. Use the I(force) option to override,
              deleting the container and all associated blobs.
            - Use state C(present) to create or update a container and upload or download a blob. If the container
              does not exist, it will be created. If it exists, it will be updated with configuration options. Provide
              a blob name and either src or dest to upload or download. Provide a src path to upload and a dest path
              to download. If a blob (uploading) or a file (downloading) already exists, it will not be overwritten
              unless I(force=true).
        default: present
        type: str
        choices:
            - absent
            - present
    public_access:
        description:
            - A container's level of public access. By default containers are private.
            - Can only be set at time of container creation.
        type: str
        choices:
            - container
            - blob

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

author:
    - Chris Houseknecht (@chouseknecht)
    - Matt Davis (@nitzmahone)

'''

EXAMPLES = '''
- name: Remove container foo
  azure_rm_storageblob:
    resource_group: myResourceGroup
    storage_account_name: clh0002
    container: foo
    state: absent

- name: Create container foo and upload a file
  azure_rm_storageblob:
    resource_group: myResourceGroup
    storage_account_name: clh0002
    container: foo
    blob: graylog.png
    src: ./files/graylog.png
    public_access: container
    content_type: 'application/image'

- name: Download the file
  azure_rm_storageblob:
    resource_group: myResourceGroup
    storage_account_name: clh0002
    container: foo
    blob: graylog.png
    dest: ~/tmp/images/graylog.png
'''

RETURN = '''
blob:
    description:
        - Facts about the current state of the blob.
    returned: when a blob is operated on
    type: dict
    sample: {
        "content_length": 136532,
        "content_settings": {
            "cache_control": null,
            "content_disposition": null,
            "content_encoding": null,
            "content_language": null,
            "content_md5": null,
            "content_type": "application/image"
        },
        "last_modified": "09-Mar-2016 22:08:25 +0000",
        "name": "graylog.png",
        "tags": {},
        "type": "BlockBlob"
    }
container:
    description:
        - Facts about the current state of the selected container.
    returned: always
    type: dict
    sample: {
        "last_modified": "09-Mar-2016 19:28:26 +0000",
        "name": "foo",
        "tags": {}
    }
'''

import os
import mimetypes

try:
    from azure.storage.blob._models import BlobType, ContentSettings
    from azure.core.exceptions import ResourceNotFoundError
except ImportError:
    # This is handled in azure_rm_common
    pass

from ansible_collections.azure.azcollection.plugins.module_utils.azure_rm_common import AzureRMModuleBase
from ansible.module_utils.basic import env_fallback


class AzureRMStorageBlob(AzureRMModuleBase):

    def __init__(self):

        self.module_arg_spec = dict(
            auth_mode=dict(
                type='str',
                choices=['key', 'login'],
                fallback=(env_fallback, ['AZURE_STORAGE_AUTH_MODE']),
                default="key"
            ),
            storage_account_name=dict(required=True, type='str', aliases=['account_name', 'storage_account']),
            blob=dict(type='str', aliases=['blob_name']),
            blob_type=dict(type='str', default='block', choices=['block', 'page']),
            container=dict(required=True, type='str', aliases=['container_name']),
            dest=dict(type='path', aliases=['destination']),
            force=dict(type='bool', default=False),
            resource_group=dict(required=True, type='str', aliases=['resource_group_name']),
            src=dict(type='str', aliases=['source']),
            batch_upload_src=dict(type='path'),
            batch_upload_dst=dict(type='path'),
            state=dict(type='str', default='present', choices=['absent', 'present']),
            public_access=dict(type='str', choices=['container', 'blob']),
            content_type=dict(type='str'),
            content_encoding=dict(type='str'),
            content_language=dict(type='str'),
            content_disposition=dict(type='str'),
            cache_control=dict(type='str'),
            content_md5=dict(type='str'),
        )

        mutually_exclusive = [('src', 'dest'), ('src', 'batch_upload_src'), ('dest', 'batch_upload_src')]

        self.blob_service_client = None
        self.blob_details = None
        self.storage_account_name = None
        self.blob = None
        self.blob_obj = None
        self.blob_type = None
        self.container = None
        self.container_obj = None
        self.dest = None
        self.force = None
        self.resource_group = None
        self.src = None
        self.batch_upload_src = None
        self.batch_upload_dst = None
        self.state = None
        self.tags = None
        self.public_access = None
        self.results = dict(
            changed=False,
            actions=[],
            container=dict(),
            blob=dict()
        )

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

    def exec_module(self, **kwargs):

        for key in list(self.module_arg_spec.keys()) + ['tags']:
            setattr(self, key, kwargs[key])

        self.results['check_mode'] = self.check_mode

        # add file path validation

        self.blob_service_client = self.get_blob_service_client(self.resource_group, self.storage_account_name, self.auth_mode)
        self.container_obj = self.get_container()
        if self.blob:
            self.blob_obj = self.get_blob()

        if self.state == 'present':
            if not self.container_obj:
                # create the container
                self.create_container()
            elif self.container_obj and not self.blob:
                # update container attributes
                update_tags, self.container_obj['tags'] = self.update_tags(self.container_obj.get('tags'))
                if update_tags:
                    self.update_container_tags(self.container_obj['tags'])

            if self.batch_upload_src:
                self.batch_upload()
                return self.results

            if self.blob:
                # create, update or download blob
                if self.src and self.src_is_valid():
                    if self.blob_obj and not self.force:
                        self.log("Cannot upload to {0}. Blob with that name already exists. Use the force option".format(self.blob))
                    else:
                        self.upload_blob()
                elif self.dest and self.dest_is_valid():
                    self.download_blob()

                update_tags, self.blob_obj['tags'] = self.update_tags(self.blob_obj.get('tags'))
                if update_tags:
                    self.update_blob_tags(self.blob_obj['tags'])

                if self.blob_content_settings_differ():
                    self.update_blob_content_settings()

        elif self.state == 'absent':
            if self.container_obj and not self.blob:
                # Delete container
                if self.container_has_blobs():
                    if self.force:
                        self.delete_container()
                    else:
                        self.log("Cannot delete container {0}. It contains blobs. Use the force option.".format(
                            self.container))
                else:
                    self.delete_container()
            elif self.container_obj and self.blob_obj:
                # Delete blob
                self.delete_blob()

        # until we sort out how we want to do this globally
        del self.results['actions']
        return self.results

    def batch_upload(self):

        def _glob_files_locally(folder_path):

            len_folder_path = len(folder_path) + 1

            for root, v, files in os.walk(folder_path):
                for f in files:
                    full_path = os.path.join(root, f)
                    yield full_path, full_path[len_folder_path:]

        def _normalize_blob_file_path(path, name):
            path_sep = '/'
            if path:
                name = path_sep.join((path, name))

            return path_sep.join(os.path.normpath(name).split(os.path.sep)).strip(path_sep)

        def _guess_content_type(file_path, original):
            if original.content_encoding or original.content_type:
                return original

            mimetypes.add_type('application/json', '.json')
            mimetypes.add_type('application/javascript', '.js')
            mimetypes.add_type('application/wasm', '.wasm')

            content_type, v = mimetypes.guess_type(file_path)
            return ContentSettings(content_type=content_type,
                                   content_disposition=original.content_disposition,
                                   content_language=original.content_language,
                                   content_md5=original.content_md5,
                                   cache_control=original.cache_control)

        if not os.path.exists(self.batch_upload_src):
            self.fail("batch upload source source directory {0} does not exist".format(self.batch_upload_src))

        if not os.path.isdir(self.batch_upload_src):
            self.fail("incorrect usage: {0} is not a directory".format(self.batch_upload_src))

        source_dir = os.path.realpath(self.batch_upload_src)
        source_files = list(_glob_files_locally(source_dir))

        content_settings = ContentSettings(content_type=self.content_type,
                                           content_encoding=self.content_encoding,
                                           content_language=self.content_language,
                                           content_disposition=self.content_disposition,
                                           cache_control=self.cache_control,
                                           content_md5=None)

        for src, blob_path in source_files:
            if self.batch_upload_dst:
                blob_path = _normalize_blob_file_path(self.batch_upload_dst, blob_path)
            if not self.check_mode:
                try:
                    client = self.blob_service_client.get_blob_client(container=self.container, blob=blob_path)
                    with open(src, "rb") as data:
                        client.upload_blob(data=data,
                                           blob_type=self.get_blob_type(self.blob_type),
                                           metadata=self.tags,
                                           content_settings=_guess_content_type(src, content_settings),
                                           overwrite=self.force)
                except Exception as exc:
                    self.fail("Error creating blob {0} - {1}".format(src, str(exc)))
            self.results['actions'].append('created blob from {0}'.format(src))

        self.results['changed'] = True
        self.results['container'] = self.container_obj

    def get_blob_type(self, blob_type):
        if blob_type == "block":
            return BlobType.BlockBlob
        elif blob_type == "page":
            return BlobType.PageBlob
        else:
            return BlobType.AppendBlob

    def get_container(self):
        result = {}
        container = None
        if self.container:
            try:
                container = self.blob_service_client.get_container_client(container=self.container).get_container_properties()
            except ResourceNotFoundError:
                pass
        if container:
            result = dict(
                name=container["name"],
                tags=container["metadata"],
                last_modified=container["last_modified"].strftime('%d-%b-%Y %H:%M:%S %z'),
            )
        return result

    def get_blob(self):
        result = dict()
        blob = None
        if self.blob:
            try:
                blob = self.blob_service_client.get_blob_client(container=self.container, blob=self.blob).get_blob_properties()
            except ResourceNotFoundError:
                pass
        if blob:
            result = dict(
                name=blob["name"],
                tags=blob["metadata"],
                last_modified=blob["last_modified"].strftime('%d-%b-%Y %H:%M:%S %z'),
                type=blob["blob_type"],
                content_length=blob["size"],
                content_settings=dict(
                    content_type=blob["content_settings"]["content_type"],
                    content_encoding=blob["content_settings"]["content_encoding"],
                    content_language=blob["content_settings"]["content_language"],
                    content_disposition=blob["content_settings"]["content_disposition"],
                    cache_control=blob["content_settings"]["cache_control"],
                    content_md5=blob["content_settings"]["content_md5"].hex() if blob["content_settings"]["content_md5"] else None,
                )
            )
        return result

    def create_container(self):
        self.log('Create container %s' % self.container)

        tags = None
        if not self.blob and self.tags:
            # when a blob is present, then tags are assigned at the blob level
            tags = self.tags

        if not self.check_mode:
            try:
                client = self.blob_service_client.get_container_client(container=self.container)
                client.create_container(metadata=tags, public_access=self.public_access)
            except Exception as exc:
                self.fail("Error creating container {0} - {1}".format(self.container, str(exc)))
        self.container_obj = self.get_container()
        self.results['changed'] = True
        self.results['actions'].append('created container {0}'.format(self.container))
        self.results['container'] = self.container_obj

    def upload_blob(self):
        content_settings = None
        if self.content_type or self.content_encoding or self.content_language or self.content_disposition or \
                self.cache_control or self.content_md5:
            content_settings = ContentSettings(
                content_type=self.content_type,
                content_encoding=self.content_encoding,
                content_language=self.content_language,
                content_disposition=self.content_disposition,
                cache_control=self.cache_control,
                content_md5=self.content_md5
            )
        if not self.check_mode:
            try:
                client = self.blob_service_client.get_blob_client(container=self.container, blob=self.blob)
                with open(self.src, "rb") as data:
                    client.upload_blob(data=data,
                                       blob_type=self.get_blob_type(self.blob_type),
                                       metadata=self.tags,
                                       content_settings=content_settings,
                                       overwrite=self.force)
            except Exception as exc:
                self.fail("Error creating blob {0} - {1}".format(self.blob, str(exc)))

        self.blob_obj = self.get_blob()
        self.results['changed'] = True
        self.results['actions'].append('created blob {0} from {1}'.format(self.blob, self.src))
        self.results['container'] = self.container_obj
        self.results['blob'] = self.blob_obj

    def download_blob(self):
        if not self.check_mode:
            try:
                client = self.blob_service_client.get_blob_client(container=self.container, blob=self.blob)
                with open(self.dest, "wb") as blob_stream:
                    blob_data = client.download_blob()
                    blob_data.readinto(blob_stream)
            except Exception as exc:
                self.fail("Failed to download blob {0}:{1} to {2} - {3}".format(self.container,
                                                                                self.blob,
                                                                                self.dest,
                                                                                exc))
        self.results['changed'] = True
        self.results['actions'].append('downloaded blob {0}:{1} to {2}'.format(self.container,
                                                                               self.blob,
                                                                               self.dest))

        self.results['container'] = self.container_obj
        self.results['blob'] = self.blob_obj

    def src_is_valid(self):
        if not os.path.isfile(self.src):
            self.fail("The source path must be a file.")
        if os.access(self.src, os.R_OK):
            return True
        self.fail("Failed to access {0}. Make sure the file exists and that you have "
                  "read access.".format(self.src))

    def dest_is_valid(self):
        if not self.check_mode:
            if not os.path.basename(self.dest):
                # dest is a directory
                if os.path.isdir(self.dest):
                    self.log("Path is dir. Appending blob name.")
                    self.dest += self.blob
                else:
                    try:
                        self.log('Attempting to makedirs {0}'.format(self.dest))
                        os.makedirs(self.dest)
                    except IOError as exc:
                        self.fail("Failed to create directory {0} - {1}".format(self.dest, str(exc)))
                    self.dest += self.blob
            else:
                # does path exist without basename
                file_name = os.path.basename(self.dest)
                path = self.dest.replace(file_name, '')
                self.log('Checking path {0}'.format(path))
                if not os.path.isdir(path):
                    try:
                        self.log('Attempting to makedirs {0}'.format(path))
                        os.makedirs(path)
                    except IOError as exc:
                        self.fail("Failed to create directory {0} - {1}".format(path, str(exc)))
            self.log('Checking final path {0}'.format(self.dest))
            if os.path.isfile(self.dest) and not self.force:
                # dest already exists and we're not forcing
                self.log("Dest {0} already exists. Cannot download. Use the force option.".format(self.dest))
                return False
        return True

    def delete_container(self):
        if not self.check_mode:
            try:
                self.blob_service_client.get_container_client(container=self.container).delete_container()
            except Exception as exc:
                self.fail("Error deleting container {0} - {1}".format(self.container, str(exc)))

        self.results['changed'] = True
        self.results['actions'].append('deleted container {0}'.format(self.container))

    def container_has_blobs(self):
        try:
            blobs = self.blob_service_client.get_container_client(container=self.container).list_blobs()
        except Exception as exc:
            self.fail("Error list blobs in {0} - {1}".format(self.container, str(exc)))
        if len(list(blobs)) > 0:
            return True
        return False

    def delete_blob(self):
        if not self.check_mode:
            try:
                self.blob_service_client.get_container_client(container=self.container).delete_blob(blob=self.blob)
            except Exception as exc:
                self.fail("Error deleting blob {0}:{1} - {2}".format(self.container, self.blob, str(exc)))

        self.results['changed'] = True
        self.results['actions'].append('deleted blob {0}:{1}'.format(self.container, self.blob))
        self.results['container'] = self.container_obj

    def update_container_tags(self, tags):
        if not self.check_mode:
            try:
                self.blob_service_client.get_container_client(container=self.container).set_container_metadata(metadata=tags)
            except Exception as exc:
                self.fail("Error updating container tags {0} - {1}".format(self.container, str(exc)))
        self.container_obj = self.get_container()
        self.results['changed'] = True
        self.results['actions'].append("updated container {0} tags.".format(self.container))
        self.results['container'] = self.container_obj

    def update_blob_tags(self, tags):
        if not self.check_mode:
            try:
                self.blob_service_client.get_blob_client(container=self.container, blob=self.blob).set_blob_metadata(metadata=tags)
            except Exception as exc:
                self.fail("Update blob tags {0}:{1} - {2}".format(self.container, self.blob, str(exc)))
        self.blob_obj = self.get_blob()
        self.results['changed'] = True
        self.results['actions'].append("updated blob {0}:{1} tags.".format(self.container, self.blob))
        self.results['container'] = self.container_obj
        self.results['blob'] = self.blob_obj

    def blob_content_settings_differ(self):
        if self.content_type or self.content_encoding or self.content_language or self.content_disposition or \
                self.cache_control or self.content_md5:
            settings = dict(
                content_type=self.content_type,
                content_encoding=self.content_encoding,
                content_language=self.content_language,
                content_disposition=self.content_disposition,
                cache_control=self.cache_control,
                content_md5=self.content_md5
            )
            if self.blob_obj['content_settings'] != settings:
                return True

        return False

    def update_blob_content_settings(self):
        content_settings = ContentSettings(
            content_type=self.content_type,
            content_encoding=self.content_encoding,
            content_language=self.content_language,
            content_disposition=self.content_disposition,
            cache_control=self.cache_control,
            content_md5=self.content_md5
        )
        if not self.check_mode:
            try:
                self.blob_service_client.get_blob_client(container=self.container, blob=self.blob).set_http_headers(content_settings=content_settings)
            except Exception as exc:
                self.fail("Update blob content settings {0}:{1} - {2}".format(self.container, self.blob, str(exc)))

        self.blob_obj = self.get_blob()
        self.results['changed'] = True
        self.results['actions'].append("updated blob {0}:{1} content settings.".format(self.container, self.blob))
        self.results['container'] = self.container_obj
        self.results['blob'] = self.blob_obj


def main():
    AzureRMStorageBlob()


if __name__ == '__main__':
    main()
