"""EMRContainersBackend class with methods for supported APIs."""
import re
from datetime import datetime

from moto.core import BaseBackend, BaseModel
from moto.core.utils import iso_8601_datetime_without_milliseconds, BackendDict

from .utils import random_cluster_id, random_job_id, get_partition, paginated_list
from .exceptions import ResourceNotFoundException

from ..config.exceptions import ValidationException

VIRTUAL_CLUSTER_ARN_TEMPLATE = "arn:{partition}:emr-containers:{region}:{account_id}:/virtualclusters/{virtual_cluster_id}"

JOB_ARN_TEMPLATE = "arn:{partition}:emr-containers:{region}:{account_id}:/virtualclusters/{virtual_cluster_id}/jobruns/{job_id}"

# Defaults used for creating a Virtual cluster
VIRTUAL_CLUSTER_STATUS = "RUNNING"
JOB_STATUS = "RUNNING"


class FakeCluster(BaseModel):
    def __init__(
        self,
        name,
        container_provider,
        client_token,
        account_id,
        region_name,
        aws_partition,
        tags=None,
        virtual_cluster_id=None,
    ):
        self.id = virtual_cluster_id or random_cluster_id()

        self.name = name
        self.client_token = client_token
        self.arn = VIRTUAL_CLUSTER_ARN_TEMPLATE.format(
            partition=aws_partition,
            region=region_name,
            account_id=account_id,
            virtual_cluster_id=self.id,
        )
        self.state = VIRTUAL_CLUSTER_STATUS
        self.container_provider = container_provider
        self.container_provider_id = container_provider["id"]
        self.namespace = container_provider["info"]["eksInfo"]["namespace"]
        self.creation_date = iso_8601_datetime_without_milliseconds(
            datetime.today().replace(hour=0, minute=0, second=0, microsecond=0)
        )
        self.tags = tags

    def __iter__(self):
        yield "id", self.id
        yield "name", self.name
        yield "arn", self.arn
        yield "state", self.state
        yield "containerProvider", self.container_provider
        yield "createdAt", self.creation_date
        yield "tags", self.tags

    def to_dict(self):
        # Format for summary https://docs.aws.amazon.com/emr-on-eks/latest/APIReference/API_DescribeVirtualCluster.html
        # (response syntax section)
        return {
            "id": self.id,
            "name": self.name,
            "arn": self.arn,
            "state": self.state,
            "containerProvider": self.container_provider,
            "createdAt": self.creation_date,
            "tags": self.tags,
        }


class FakeJob(BaseModel):
    def __init__(
        self,
        name,
        virtual_cluster_id,
        client_token,
        execution_role_arn,
        release_label,
        job_driver,
        configuration_overrides,
        account_id,
        region_name,
        aws_partition,
        tags,
    ):
        self.id = random_job_id()
        self.name = name
        self.virtual_cluster_id = virtual_cluster_id
        self.arn = JOB_ARN_TEMPLATE.format(
            partition=aws_partition,
            region=region_name,
            account_id=account_id,
            virtual_cluster_id=self.virtual_cluster_id,
            job_id=self.id,
        )
        self.state = JOB_STATUS
        self.client_token = client_token
        self.execution_role_arn = execution_role_arn
        self.release_label = release_label
        self.job_driver = job_driver
        self.configuration_overrides = configuration_overrides
        self.created_at = iso_8601_datetime_without_milliseconds(
            datetime.today().replace(hour=0, minute=0, second=0, microsecond=0)
        )
        self.created_by = None
        self.finished_at = None
        self.state_details = None
        self.failure_reason = None
        self.tags = tags

    def __iter__(self):
        yield "id", self.id
        yield "name", self.name
        yield "virtualClusterId", self.virtual_cluster_id
        yield "arn", self.arn
        yield "state", self.state
        yield "clientToken", self.client_token
        yield "executionRoleArn", self.execution_role_arn
        yield "releaseLabel", self.release_label
        yield "configurationOverrides", self.release_label
        yield "jobDriver", self.job_driver
        yield "createdAt", self.created_at
        yield "createdBy", self.created_by
        yield "finishedAt", self.finished_at
        yield "stateDetails", self.state_details
        yield "failureReason", self.failure_reason
        yield "tags", self.tags

    def to_dict(self):
        # Format for summary https://docs.aws.amazon.com/emr-on-eks/latest/APIReference/API_DescribeJobRun.html
        # (response syntax section)
        return {
            "id": self.id,
            "name": self.name,
            "virtualClusterId": self.virtual_cluster_id,
            "arn": self.arn,
            "state": self.state,
            "clientToken": self.client_token,
            "executionRoleArn": self.execution_role_arn,
            "releaseLabel": self.release_label,
            "configurationOverrides": self.configuration_overrides,
            "jobDriver": self.job_driver,
            "createdAt": self.created_at,
            "createdBy": self.created_by,
            "finishedAt": self.finished_at,
            "stateDetails": self.state_details,
            "failureReason": self.failure_reason,
            "tags": self.tags,
        }


class EMRContainersBackend(BaseBackend):
    """Implementation of EMRContainers APIs."""

    def __init__(self, region_name, account_id):
        super().__init__(region_name, account_id)
        self.virtual_clusters = dict()
        self.virtual_cluster_count = 0
        self.jobs = dict()
        self.job_count = 0
        self.partition = get_partition(region_name)

    def create_virtual_cluster(self, name, container_provider, client_token, tags=None):
        occupied_namespaces = [
            virtual_cluster.namespace
            for virtual_cluster in self.virtual_clusters.values()
        ]

        if container_provider["info"]["eksInfo"]["namespace"] in occupied_namespaces:
            raise ValidationException(
                "A virtual cluster already exists in the given namespace"
            )

        virtual_cluster = FakeCluster(
            name=name,
            container_provider=container_provider,
            client_token=client_token,
            tags=tags,
            account_id=self.account_id,
            region_name=self.region_name,
            aws_partition=self.partition,
        )

        self.virtual_clusters[virtual_cluster.id] = virtual_cluster
        self.virtual_cluster_count += 1
        return virtual_cluster

    def delete_virtual_cluster(self, cluster_id):
        if cluster_id not in self.virtual_clusters:
            raise ValidationException("VirtualCluster does not exist")

        self.virtual_clusters[cluster_id].state = "TERMINATED"
        return self.virtual_clusters[cluster_id]

    def describe_virtual_cluster(self, cluster_id):
        if cluster_id not in self.virtual_clusters:
            raise ValidationException(f"Virtual cluster {cluster_id} doesn't exist.")

        return self.virtual_clusters[cluster_id].to_dict()

    def list_virtual_clusters(
        self,
        container_provider_id,
        container_provider_type,
        created_after,
        created_before,
        states,
        max_results,
        next_token,
    ):
        virtual_clusters = [
            virtual_cluster.to_dict()
            for virtual_cluster in self.virtual_clusters.values()
        ]

        if container_provider_id:
            virtual_clusters = [
                virtual_cluster
                for virtual_cluster in virtual_clusters
                if virtual_cluster["containerProvider"]["id"] == container_provider_id
            ]

        if container_provider_type:
            virtual_clusters = [
                virtual_cluster
                for virtual_cluster in virtual_clusters
                if virtual_cluster["containerProvider"]["type"]
                == container_provider_type
            ]

        if created_after:
            virtual_clusters = [
                virtual_cluster
                for virtual_cluster in virtual_clusters
                if virtual_cluster["createdAt"] >= created_after
            ]

        if created_before:
            virtual_clusters = [
                virtual_cluster
                for virtual_cluster in virtual_clusters
                if virtual_cluster["createdAt"] <= created_before
            ]

        if states:
            virtual_clusters = [
                virtual_cluster
                for virtual_cluster in virtual_clusters
                if virtual_cluster["state"] in states
            ]
        sort_key = "name"
        return paginated_list(virtual_clusters, sort_key, max_results, next_token)

    def start_job_run(
        self,
        name,
        virtual_cluster_id,
        client_token,
        execution_role_arn,
        release_label,
        job_driver,
        configuration_overrides,
        tags,
    ):

        if virtual_cluster_id not in self.virtual_clusters.keys():
            raise ResourceNotFoundException(
                f"Virtual cluster {virtual_cluster_id} doesn't exist."
            )

        if not re.match(
            r"emr-[0-9]{1}\.[0-9]{1,2}\.0-(latest|[0-9]{8})", release_label
        ):
            raise ResourceNotFoundException(f"Release {release_label} doesn't exist.")

        job = FakeJob(
            name=name,
            virtual_cluster_id=virtual_cluster_id,
            client_token=client_token,
            execution_role_arn=execution_role_arn,
            release_label=release_label,
            job_driver=job_driver,
            configuration_overrides=configuration_overrides,
            tags=tags,
            account_id=self.account_id,
            region_name=self.region_name,
            aws_partition=self.partition,
        )

        self.jobs[job.id] = job
        self.job_count += 1
        return job

    def cancel_job_run(self, job_id, virtual_cluster_id):

        if not re.match(r"[a-z,A-Z,0-9]{19}", job_id):
            raise ValidationException("Invalid job run short id")

        if job_id not in self.jobs.keys():
            raise ResourceNotFoundException(f"Job run {job_id} doesn't exist.")

        if virtual_cluster_id != self.jobs[job_id].virtual_cluster_id:
            raise ResourceNotFoundException(f"Job run {job_id} doesn't exist.")

        if self.jobs[job_id].state in [
            "FAILED",
            "CANCELLED",
            "CANCEL_PENDING",
            "COMPLETED",
        ]:
            raise ValidationException(f"Job run {job_id} is not in a cancellable state")

        job = self.jobs[job_id]
        job.state = "CANCELLED"
        job.finished_at = iso_8601_datetime_without_milliseconds(
            datetime.today().replace(hour=0, minute=1, second=0, microsecond=0)
        )
        job.state_details = "JobRun CANCELLED successfully."

        return job

    def list_job_runs(
        self,
        virtual_cluster_id,
        created_before,
        created_after,
        name,
        states,
        max_results,
        next_token,
    ):
        jobs = [job.to_dict() for job in self.jobs.values()]

        jobs = [job for job in jobs if job["virtualClusterId"] == virtual_cluster_id]

        if created_after:
            jobs = [job for job in jobs if job["createdAt"] >= created_after]

        if created_before:
            jobs = [job for job in jobs if job["createdAt"] <= created_before]

        if states:
            jobs = [job for job in jobs if job["state"] in states]

        if name:
            jobs = [job for job in jobs if job["name"] in name]

        sort_key = "id"
        return paginated_list(jobs, sort_key, max_results, next_token)

    def describe_job_run(self, job_id, virtual_cluster_id):
        if not re.match(r"[a-z,A-Z,0-9]{19}", job_id):
            raise ValidationException("Invalid job run short id")

        if job_id not in self.jobs.keys():
            raise ResourceNotFoundException(f"Job run {job_id} doesn't exist.")

        if virtual_cluster_id != self.jobs[job_id].virtual_cluster_id:
            raise ResourceNotFoundException(f"Job run {job_id} doesn't exist.")

        return self.jobs[job_id].to_dict()


emrcontainers_backends = BackendDict(EMRContainersBackend, "emr-containers")
