from __future__ import unicode_literals

import datetime
from boto3 import Session

from moto.compat import OrderedDict
from moto.core import BaseBackend, BaseModel, CloudFormationModel
from .utils import get_random_pipeline_id, remove_capitalization_of_dict_keys


class PipelineObject(BaseModel):
    def __init__(self, object_id, name, fields):
        self.object_id = object_id
        self.name = name
        self.fields = fields

    def to_json(self):
        return {"fields": self.fields, "id": self.object_id, "name": self.name}


class Pipeline(CloudFormationModel):
    def __init__(self, name, unique_id, **kwargs):
        self.name = name
        self.unique_id = unique_id
        self.description = kwargs.get("description", "")
        self.pipeline_id = get_random_pipeline_id()
        self.creation_time = datetime.datetime.utcnow()
        self.objects = []
        self.status = "PENDING"
        self.tags = kwargs.get("tags", [])

    @property
    def physical_resource_id(self):
        return self.pipeline_id

    def to_meta_json(self):
        return {"id": self.pipeline_id, "name": self.name}

    def to_json(self):
        return {
            "description": self.description,
            "fields": [
                {"key": "@pipelineState", "stringValue": self.status},
                {"key": "description", "stringValue": self.description},
                {"key": "name", "stringValue": self.name},
                {
                    "key": "@creationTime",
                    "stringValue": datetime.datetime.strftime(
                        self.creation_time, "%Y-%m-%dT%H-%M-%S"
                    ),
                },
                {"key": "@id", "stringValue": self.pipeline_id},
                {"key": "@sphere", "stringValue": "PIPELINE"},
                {"key": "@version", "stringValue": "1"},
                {"key": "@userId", "stringValue": "924374875933"},
                {"key": "@accountId", "stringValue": "924374875933"},
                {"key": "uniqueId", "stringValue": self.unique_id},
            ],
            "name": self.name,
            "pipelineId": self.pipeline_id,
            "tags": self.tags,
        }

    def set_pipeline_objects(self, pipeline_objects):
        self.objects = [
            PipelineObject(
                pipeline_object["id"],
                pipeline_object["name"],
                pipeline_object["fields"],
            )
            for pipeline_object in remove_capitalization_of_dict_keys(pipeline_objects)
        ]

    def activate(self):
        self.status = "SCHEDULED"

    @staticmethod
    def cloudformation_name_type():
        return "Name"

    @staticmethod
    def cloudformation_type():
        # https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-datapipeline-pipeline.html
        return "AWS::DataPipeline::Pipeline"

    @classmethod
    def create_from_cloudformation_json(
        cls, resource_name, cloudformation_json, region_name
    ):
        datapipeline_backend = datapipeline_backends[region_name]
        properties = cloudformation_json["Properties"]

        cloudformation_unique_id = "cf-" + resource_name
        pipeline = datapipeline_backend.create_pipeline(
            resource_name, cloudformation_unique_id
        )
        datapipeline_backend.put_pipeline_definition(
            pipeline.pipeline_id, properties["PipelineObjects"]
        )

        if properties["Activate"]:
            pipeline.activate()
        return pipeline


class DataPipelineBackend(BaseBackend):
    def __init__(self):
        self.pipelines = OrderedDict()

    def create_pipeline(self, name, unique_id, **kwargs):
        pipeline = Pipeline(name, unique_id, **kwargs)
        self.pipelines[pipeline.pipeline_id] = pipeline
        return pipeline

    def list_pipelines(self):
        return self.pipelines.values()

    def describe_pipelines(self, pipeline_ids):
        pipelines = [
            pipeline
            for pipeline in self.pipelines.values()
            if pipeline.pipeline_id in pipeline_ids
        ]
        return pipelines

    def get_pipeline(self, pipeline_id):
        return self.pipelines[pipeline_id]

    def delete_pipeline(self, pipeline_id):
        self.pipelines.pop(pipeline_id, None)

    def put_pipeline_definition(self, pipeline_id, pipeline_objects):
        pipeline = self.get_pipeline(pipeline_id)
        pipeline.set_pipeline_objects(pipeline_objects)

    def get_pipeline_definition(self, pipeline_id):
        pipeline = self.get_pipeline(pipeline_id)
        return pipeline.objects

    def describe_objects(self, object_ids, pipeline_id):
        pipeline = self.get_pipeline(pipeline_id)
        pipeline_objects = [
            pipeline_object
            for pipeline_object in pipeline.objects
            if pipeline_object.object_id in object_ids
        ]
        return pipeline_objects

    def activate_pipeline(self, pipeline_id):
        pipeline = self.get_pipeline(pipeline_id)
        pipeline.activate()


datapipeline_backends = {}
for region in Session().get_available_regions("datapipeline"):
    datapipeline_backends[region] = DataPipelineBackend()
for region in Session().get_available_regions(
    "datapipeline", partition_name="aws-us-gov"
):
    datapipeline_backends[region] = DataPipelineBackend()
for region in Session().get_available_regions("datapipeline", partition_name="aws-cn"):
    datapipeline_backends[region] = DataPipelineBackend(region)