// Copyright (c) Microsoft Corporation.
// Licensed under the MIT license.

// eslint-disable-next-line @typescript-eslint/camelcase
import {Client1_10, config} from 'kubernetes-client';
import {getLogger, Logger} from 'common/log';

/**
 * This function uses the environment variable
 * 'KUBERNETES_SERVICE_HOST' to determine whether
 * the code is running from within a kubernetes container.
 * If it is, it returns the in-cluster config
 * instead of the kubeconfig.
 */
function getKubernetesConfig(): any {
    if ('KUBERNETES_SERVICE_HOST' in process.env) {
        return config.getInCluster();
    } else {
        return config.fromKubeconfig();
    }
}

/**
 * Generic Kubernetes client, target version >= 1.9
 */
class GeneralK8sClient {
    protected readonly client: any;
    protected readonly log: Logger = getLogger('GeneralK8sClient');
    protected namespace: string = 'default';

    constructor() {
        this.client = new Client1_10({config: getKubernetesConfig(), version: '1.9'});
        this.client.loadSpec();
    }

    public set setNamespace(namespace: string) {
        this.namespace = namespace;
    }
    public get getNamespace(): string {
        return this.namespace;
    }

    private matchStorageClass(response: any): string {
        const adlSupportedProvisioners: RegExp[] = [
            new RegExp("microk8s.io/hostpath"),
            new RegExp(".*cephfs.csi.ceph.com"),
            new RegExp(".*azure.*"),
            new RegExp("\\b" + "efs" + "\\b")
        ]
        const templateLen = adlSupportedProvisioners.length,
            responseLen = response.items.length
        let i = 0,
            j = 0;
        for (; i < responseLen; i++) {
            const provisioner: string = response.items[i].provisioner
            for (; j < templateLen; j++) {
                if (provisioner.match(adlSupportedProvisioners[j])) {
                    return response.items[i].metadata.name;
                }
            }
        }
        return "Not Found!";
    }

    public async getStorageClass(): Promise<string> {
        let result: Promise<string>;
        const response: any = await this.client.apis["storage.k8s.io"].v1beta1.storageclasses.get()
        const storageClassType: string = this.matchStorageClass(response.body)
        if (response.statusCode && (response.statusCode >= 200 && response.statusCode <= 299)) {
            if (storageClassType != "Not Found!") {
                result = Promise.resolve(storageClassType);
            }
            else {
                result = Promise.reject("No StorageClasses are supported!")
            }
        } else {
            result = Promise.reject(`List storageclasses failed, statusCode is ${response.statusCode}`);
        }
        return result;
    }

    public async createDeployment(deploymentManifest: any): Promise<string> {
        let result: Promise<string>;
        const response: any = await this.client.apis.apps.v1.namespaces(this.namespace)
            .deployments.post({body: deploymentManifest})
        if (response.statusCode && (response.statusCode >= 200 && response.statusCode <= 299)) {
            result = Promise.resolve(response.body.metadata.uid);
        } else {
            result = Promise.reject(`Create deployment failed, statusCode is ${response.statusCode}`);
        }
        return result;
    }

    public async deleteDeployment(deploymentName: string): Promise<boolean> {
        let result: Promise<boolean>;
        // TODO: change this hard coded deployment name after demo
        const response: any = await this.client.apis.apps.v1.namespaces(this.namespace)
            .deployment(deploymentName).delete();
        if (response.statusCode && (response.statusCode >= 200 && response.statusCode <= 299)) {
            result = Promise.resolve(true);
        } else {
            result = Promise.reject(`Delete deployment failed, statusCode is ${response.statusCode}`);
        }
        return result;
    }

    public async createConfigMap(configMapManifest: any): Promise<boolean> {
        let result: Promise<boolean>;
        const response: any = await this.client.api.v1.namespaces(this.namespace)
            .configmaps.post({body: configMapManifest});
        if (response.statusCode && (response.statusCode >= 200 && response.statusCode <= 299)) {
            result = Promise.resolve(true);
        } else {
            result = Promise.reject(`Create configMap failed, statusCode is ${response.statusCode}`);
        }

        return result;
    }

    public async createPersistentVolumeClaim(pvcManifest: any): Promise<boolean> {
        let result: Promise<boolean>;
        const response: any = await this.client.api.v1.namespaces(this.namespace)
            .persistentvolumeclaims.post({body: pvcManifest});
        if (response.statusCode && (response.statusCode >= 200 && response.statusCode <= 299)) {
            result = Promise.resolve(true);
        } else {
            result = Promise.reject(`Create pvc failed, statusCode is ${response.statusCode}`);
        }
        return result;
    }

    public async createSecret(secretManifest: any): Promise<boolean> {
        let result: Promise<boolean>;
        const response: any = await this.client.api.v1.namespaces(this.namespace)
            .secrets.post({body: secretManifest});
        if (response.statusCode && (response.statusCode >= 200 && response.statusCode <= 299)) {
            result = Promise.resolve(true);
        } else {
            result = Promise.reject(`Create secrets failed, statusCode is ${response.statusCode}`);
        }

        return result;
    }
}

/**
 * Kubernetes CRD client
 */
abstract class KubernetesCRDClient {
    protected readonly client: any;
    protected readonly log: Logger = getLogger('KubernetesCRDClient');
    protected crdSchema: any;
    public namespace: string = 'default';

    constructor() {
        this.client = new Client1_10({config: getKubernetesConfig()});
        this.client.loadSpec();
    }

    protected abstract get operator(): any;

    public abstract get containerName(): string;

    public get jobKind(): string {
        if (this.crdSchema
            && this.crdSchema.spec
            && this.crdSchema.spec.names
            && this.crdSchema.spec.names.kind) {
            return this.crdSchema.spec.names.kind;
        } else {
            throw new Error('KubeflowOperatorClient: getJobKind failed, kind is undefined in crd schema!');
        }
    }

    public get apiVersion(): string {
        if (this.crdSchema
            && this.crdSchema.spec
            && this.crdSchema.spec.version) {
            return this.crdSchema.spec.version;
        } else {
            throw new Error('KubeflowOperatorClient: get apiVersion failed, version is undefined in crd schema!');
        }
    }

    public async createKubernetesJob(jobManifest: any): Promise<boolean> {
        let result: Promise<boolean>;
        const response: any = await this.operator.post({body: jobManifest});
        if (response.statusCode && (response.statusCode >= 200 && response.statusCode <= 299)) {
            result = Promise.resolve(true);
        } else {
            result = Promise.reject(`KubernetesApiClient createKubernetesJob failed, statusCode is ${response.statusCode}`);
        }

        return result;
    }

    //TODO : replace any
    public async getKubernetesJob(kubeflowJobName: string): Promise<any> {
        let result: Promise<any>;
        const response: any = await this.operator(kubeflowJobName)
            .get();
        if (response.statusCode && (response.statusCode >= 200 && response.statusCode <= 299)) {
            result = Promise.resolve(response.body);
        } else {
            result = Promise.reject(`KubernetesApiClient getKubernetesJob failed, statusCode is ${response.statusCode}`);
        }

        return result;
    }

    public async deleteKubernetesJob(labels: Map<string, string>): Promise<boolean> {
        let result: Promise<boolean>;
        // construct match query from labels for deleting tfjob
        const matchQuery: string = Array.from(labels.keys())
            .map((labelKey: string) => `${labelKey}=${labels.get(labelKey)}`)
            .join(',');
        try {
            const deleteResult: any = await this.operator()
                .delete({
                    qs: {
                        labelSelector: matchQuery,
                        propagationPolicy: 'Background'
                    }
                });
            if (deleteResult.statusCode && deleteResult.statusCode >= 200 && deleteResult.statusCode <= 299) {
                result = Promise.resolve(true);
            } else {
                result = Promise.reject(
                    `KubernetesApiClient, delete labels ${matchQuery} get wrong statusCode ${deleteResult.statusCode}`);
            }
        } catch (err) {
            result = Promise.reject(err);
        }

        return result;
    }
}

export {KubernetesCRDClient, GeneralK8sClient};