/**
 * Copyright (c) Microsoft Corporation
 * All rights reserved.
 *
 * MIT License
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and
 * to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED *AS IS*, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

'use strict';

import * as cpp from 'child-process-promise';
import * as path from 'path';

import * as azureStorage from 'azure-storage';
import { EventEmitter } from 'events';
import { Base64 } from 'js-base64';
import { String } from 'typescript-string-operations';
import { getExperimentId, getInitTrialSequenceId } from '../../common/experimentStartupInfo';
import { getLogger, Logger } from '../../common/log';
import {
    NNIManagerIpConfig, TrialJobDetail, TrialJobMetric
} from '../../common/trainingService';
import { getExperimentRootDir, getIPV4Address, getJobCancelStatus, getVersion, uniqueString } from '../../common/utils';
import { AzureStorageClientUtility } from './azureStorageClientUtils';
import { GeneralK8sClient, KubernetesCRDClient } from './kubernetesApiClient';
import { KubernetesClusterConfig } from './kubernetesConfig';
import { kubernetesScriptFormat, KubernetesTrialJobDetail } from './kubernetesData';
import { KubernetesJobRestServer } from './kubernetesJobRestServer';

/**
 * Training Service implementation for Kubernetes
 */
abstract class KubernetesTrainingService {
    protected readonly NNI_KUBERNETES_TRIAL_LABEL: string = 'nni-kubernetes-trial';
    protected readonly log!: Logger;
    protected readonly metricsEmitter: EventEmitter;
    protected readonly trialJobsMap: Map<string, KubernetesTrialJobDetail>;
    //  experiment root dir in NFS
    protected readonly trialLocalNFSTempFolder: string;
    protected stopping: boolean = false;
    protected experimentId! : string;
    protected nextTrialSequenceId: number;
    protected kubernetesRestServerPort?: number;
    protected readonly CONTAINER_MOUNT_PATH: string;
    protected azureStorageClient?: azureStorage.FileService;
    protected azureStorageShare?: string;
    protected azureStorageSecretName?: string;
    protected azureStorageAccountName?: string;
    protected nniManagerIpConfig?: NNIManagerIpConfig;
    protected readonly genericK8sClient: GeneralK8sClient;
    protected kubernetesCRDClient?: KubernetesCRDClient;
    protected kubernetesJobRestServer?: KubernetesJobRestServer;
    protected kubernetesClusterConfig?: KubernetesClusterConfig;
    protected versionCheck: boolean = true;
    protected logCollection: string;

    constructor() {
        this.log = getLogger();
        this.metricsEmitter = new EventEmitter();
        this.trialJobsMap = new Map<string, KubernetesTrialJobDetail>();
        this.trialLocalNFSTempFolder = path.join(getExperimentRootDir(), 'trials-nfs-tmp');
        this.experimentId = getExperimentId();
        this.nextTrialSequenceId = -1;
        this.CONTAINER_MOUNT_PATH = '/tmp/mount';
        this.genericK8sClient = new GeneralK8sClient();
        this.logCollection = 'none';
    }

    // tslint:disable:no-any
    public generatePodResource(memory: number, cpuNum: number, gpuNum: number): any {
        return {
            memory: `${memory}Mi`,
            cpu: `${cpuNum}`,
            'nvidia.com/gpu': `${gpuNum}`
        };
    } // tslint:enable:no-any

    public async listTrialJobs(): Promise<TrialJobDetail[]> {
        const jobs: TrialJobDetail[] = [];

        for (const [key, value] of this.trialJobsMap) {
            if (value.form.jobType === 'TRIAL') {
                jobs.push(await this.getTrialJob(key));
            }
        }

        return Promise.resolve(jobs);
    }

    public async getTrialJob(trialJobId: string): Promise<TrialJobDetail> {

        const kubernetesTrialJob: TrialJobDetail | undefined = this.trialJobsMap.get(trialJobId);

        if (kubernetesTrialJob === undefined) {
            return Promise.reject(`trial job ${trialJobId} not found`);
        }

        return Promise.resolve(kubernetesTrialJob);
    }

    public addTrialJobMetricListener(listener: (metric: TrialJobMetric) => void): void {
        this.metricsEmitter.on('metric', listener);
    }

    public removeTrialJobMetricListener(listener: (metric: TrialJobMetric) => void): void {
        this.metricsEmitter.off('metric', listener);
    }

    public get isMultiPhaseJobSupported(): boolean {
        return false;
    }

    public getClusterMetadata(key: string): Promise<string> {
        return Promise.resolve('');
    }

    public get MetricsEmitter() : EventEmitter {
        return this.metricsEmitter;
    }

    public async cancelTrialJob(trialJobId: string, isEarlyStopped: boolean = false): Promise<void> {
        const trialJobDetail : KubernetesTrialJobDetail | undefined =  this.trialJobsMap.get(trialJobId);
        if (trialJobDetail === undefined) {
            const errorMessage: string = `CancelTrialJob: trial job id ${trialJobId} not found`;
            this.log.error(errorMessage);

            return Promise.reject(errorMessage);
        }
        if (this.kubernetesCRDClient === undefined) {
            const errorMessage: string = `CancelTrialJob: trial job id ${trialJobId} failed because operatorClient is undefined`;
            this.log.error(errorMessage);

            return Promise.reject(errorMessage);
        }

        try {
            await this.kubernetesCRDClient.deleteKubernetesJob(new Map(
                [
                    ['app', this.NNI_KUBERNETES_TRIAL_LABEL],
                    ['expId', getExperimentId()],
                    ['trialId', trialJobId]
                ]
            ));
        } catch (err) {
            const errorMessage: string = `Delete trial ${trialJobId} failed: ${err}`;
            this.log.error(errorMessage);

            return Promise.reject(errorMessage);
        }

        trialJobDetail.endTime = Date.now();
        trialJobDetail.status = getJobCancelStatus(isEarlyStopped);

        return Promise.resolve();
    }

    public async cleanUp(): Promise<void> {
        this.stopping = true;

        // First, cancel all running kubernetes jobs
        for (const [trialJobId, kubernetesTrialJob] of this.trialJobsMap) {
            if (['RUNNING', 'WAITING', 'UNKNOWN'].includes(kubernetesTrialJob.status)) {
                try {
                    await this.cancelTrialJob(trialJobId);
                } catch (error) {
                  // DONT throw error during cleanup
                }
                kubernetesTrialJob.status = 'SYS_CANCELED';
            }
        }

        // Delete all kubernetes jobs whose expId label is current experiment id
        try {
            if (this.kubernetesCRDClient !== undefined) {
                await this.kubernetesCRDClient.deleteKubernetesJob(new Map(
                    [
                        ['app', this.NNI_KUBERNETES_TRIAL_LABEL],
                        ['expId', getExperimentId()]
                    ]
                ));
            }
        } catch (error) {
            this.log.error(`Delete kubernetes job with label: app=${this.NNI_KUBERNETES_TRIAL_LABEL},\
            expId=${getExperimentId()} failed, error is ${error}`);
        }

        // Unmount NFS
        try {
            await cpp.exec(`sudo umount ${this.trialLocalNFSTempFolder}`);
        } catch (error) {
            this.log.error(`Unmount ${this.trialLocalNFSTempFolder} failed, error is ${error}`);
        }

        // Stop kubernetes rest server
        if (this.kubernetesJobRestServer === undefined) {
            throw new Error('kubernetesJobRestServer not initialized!');
        }
        try {
            await this.kubernetesJobRestServer.stop();
            this.log.info('Kubernetes Training service rest server stopped successfully.');
        } catch (error) {
            // tslint:disable-next-line: no-unsafe-any
            this.log.error(`Kubernetes Training service rest server stopped failed, error: ${error.message}`);

            return Promise.reject(error);
        }

        return Promise.resolve();
    }

    protected generateSequenceId(): number {
        if (this.nextTrialSequenceId === -1) {
            this.nextTrialSequenceId = getInitTrialSequenceId();
        }

        return this.nextTrialSequenceId++;
    }

    // tslint:disable: no-unsafe-any no-any
    protected async createAzureStorage(vaultName: string, valutKeyName: string, accountName: string, azureShare: string): Promise<void> {
        try {
            const result: any = await cpp.exec(`az keyvault secret show --name ${valutKeyName} --vault-name ${vaultName}`);
            if (result.stderr) {
                const errorMessage: string = result.stderr;
                this.log.error(errorMessage);

                return Promise.reject(errorMessage);
            }
            const storageAccountKey: any = JSON.parse(result.stdout).value;
            if (this.azureStorageAccountName === undefined) {
                throw new Error('azureStorageAccountName not initialized!');
            }
            //create storage client
            this.azureStorageClient = azureStorage.createFileService(this.azureStorageAccountName, storageAccountKey);
            await AzureStorageClientUtility.createShare(this.azureStorageClient, this.azureStorageShare);
            //create sotrage secret
            this.azureStorageSecretName = String.Format('nni-secret-{0}', uniqueString(8)
                                                                            .toLowerCase());
            await this.genericK8sClient.createSecret(
                {
                    apiVersion: 'v1',
                    kind: 'Secret',
                    metadata: {
                        name: this.azureStorageSecretName,
                        namespace: 'default',
                        labels: {
                            app: this.NNI_KUBERNETES_TRIAL_LABEL,
                            expId: getExperimentId()
                        }
                    },
                    type: 'Opaque',
                    data: {
                        azurestorageaccountname: Base64.encode(this.azureStorageAccountName),
                        azurestorageaccountkey: Base64.encode(storageAccountKey)
                    }
                }
            );
        } catch (error) {
            this.log.error(error);

            return Promise.reject(error);
        }

        return Promise.resolve();
    }
    // tslint:enable: no-unsafe-any no-any

    /**
     * Genereate run script for different roles(like worker or ps)
     * @param trialJobId trial job id
     * @param trialWorkingFolder working folder
     * @param command command
     * @param trialSequenceId sequence id
     */
    protected async generateRunScript(platform: string, trialJobId: string, trialWorkingFolder: string,
                                      command: string, trialSequenceId: string, roleName: string, gpuNum: number): Promise<string> {
        let nvidiaScript: string = '';
        // Nvidia devcie plugin for K8S has a known issue that requesting zero GPUs allocates all GPUs
        // Refer https://github.com/NVIDIA/k8s-device-plugin/issues/61
        // So we have to explicitly set CUDA_VISIBLE_DEVICES to empty if user sets gpuNum to 0 in NNI config file
        if (gpuNum === 0) {
            nvidiaScript = `export CUDA_VISIBLE_DEVICES='0'`;
        }
        // tslint:disable-next-line: strict-boolean-expressions
        const nniManagerIp: string = this.nniManagerIpConfig ? this.nniManagerIpConfig.nniManagerIp : getIPV4Address();
        const version: string = this.versionCheck ? await getVersion() : '';
        const runScript: string = String.Format(
            kubernetesScriptFormat,
            platform,
            trialJobId,
            path.join(trialWorkingFolder, 'output', `${roleName}_output`),
            trialJobId,
            getExperimentId(),
            trialWorkingFolder,
            trialSequenceId,
            nvidiaScript,
            command,
            nniManagerIp,
            this.kubernetesRestServerPort,
            version,
            this.logCollection
        );

        return Promise.resolve(runScript);
    }
    protected async createNFSStorage(nfsServer: string, nfsPath: string): Promise<void> {
        await cpp.exec(`mkdir -p ${this.trialLocalNFSTempFolder}`);
        try {
            await cpp.exec(`sudo mount ${nfsServer}:${nfsPath} ${this.trialLocalNFSTempFolder}`);
        } catch (error) {
            const mountError: string = `Mount NFS ${nfsServer}:${nfsPath} to ${this.trialLocalNFSTempFolder} failed, error is ${error}`;
            this.log.error(mountError);

            return Promise.reject(mountError);
        }

        return Promise.resolve();
    }
}
export { KubernetesTrainingService };