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

'use strict';

import * as fs from 'fs';
import * as path from 'path';
import * as component from '../../../../common/component';
import { FrameworkControllerConfig, FrameworkControllerTaskRoleConfig, toMegaBytes } from '../../../../common/experimentConfig';
import { ExperimentStartupInfo } from '../../../../common/experimentStartupInfo';
import { EnvironmentInformation } from '../../environment';
import { KubernetesEnvironmentService } from './kubernetesEnvironmentService';
import { FrameworkControllerClientFactory } from '../../../kubernetes/frameworkcontroller/frameworkcontrollerApiClient';
import { FrameworkControllerClusterConfigAzure, FrameworkControllerJobStatus, FrameworkControllerTrialConfigTemplate,
     FrameworkControllerJobCompleteStatus } from '../../../kubernetes/frameworkcontroller/frameworkcontrollerConfig';
import { KeyVaultConfig, AzureStorage } from '../../../kubernetes/kubernetesConfig';

@component.Singleton
export class FrameworkControllerEnvironmentService extends KubernetesEnvironmentService {

    private config: FrameworkControllerConfig;
    private createStoragePromise?: Promise<void>;
    private readonly fcContainerPortMap: Map<string, number> = new Map<string, number>(); // store frameworkcontroller container port
    

    constructor(config: FrameworkControllerConfig, info: ExperimentStartupInfo) {
        super(config, info);
        this.experimentId = info.experimentId;
        this.config = config;
        // Create kubernetesCRDClient
        this.kubernetesCRDClient = FrameworkControllerClientFactory.createClient(this.config.namespace);
        // Create storage
        if (this.config.storage.storageType === 'azureStorage') {
            if (this.config.storage.azureShare === undefined ||
                this.config.storage.azureAccount === undefined ||
                this.config.storage.keyVaultName === undefined ||
                this.config.storage.keyVaultKey === undefined) {
                throw new Error("Azure storage configuration error!");
            }
            this.azureStorageAccountName = this.config.storage.azureAccount;
            this.azureStorageShare = this.config.storage.azureShare;
            this.createStoragePromise = this.createAzureStorage(this.config.storage.keyVaultName, this.config.storage.keyVaultKey);
        } else if (this.config.storage.storageType === 'nfs') {
            if (this.config.storage.server === undefined ||
                this.config.storage.path === undefined) {
                    throw new Error("NFS storage configuration error!");
                }
            this.createStoragePromise = this.createNFSStorage(this.config.storage.server, this.config.storage.path);
        }
    }

    public get environmentMaintenceLoopInterval(): number {
        return 5000;
    }

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

    public get getName(): string {
        return 'frameworkcontroller';
    }

    public async startEnvironment(environment: EnvironmentInformation): Promise<void> {
        if (this.kubernetesCRDClient === undefined) {
            throw new Error("kubernetesCRDClient not initialized!");
        }
        if (this.createStoragePromise) {
            await this.createStoragePromise;
        }
        let configTaskRoles: any = undefined;
        configTaskRoles = this.config.taskRoles;
        //Generate the port used for taskRole
        this.generateContainerPort(configTaskRoles);

        const expFolder = `${this.CONTAINER_MOUNT_PATH}/nni/${this.experimentId}`;
        environment.command = `cd ${expFolder} && ${environment.command} \
1>${expFolder}/envs/${environment.id}/trialrunner_stdout 2>${expFolder}/envs/${environment.id}/trialrunner_stderr`;
        environment.maxTrialNumberPerGpu = this.config.maxTrialNumberPerGpu;

        const frameworkcontrollerJobName: string = `nniexp${this.experimentId}env${environment.id}`.toLowerCase();
        const command = this.generateCommandScript(this.config.taskRoles, environment.command);
        await fs.promises.writeFile(path.join(this.environmentLocalTempFolder, "run.sh"), command, { encoding: 'utf8' });

        //upload script files to sotrage
        const trialJobOutputUrl: string = await this.uploadFolder(this.environmentLocalTempFolder, `nni/${this.experimentId}`);
        environment.trackingUrl = trialJobOutputUrl;
        // Generate kubeflow job resource config object
        const frameworkcontrollerJobConfig: any = await this.prepareFrameworkControllerConfig(
            environment.id,
            this.environmentWorkingFolder,
            frameworkcontrollerJobName
        );
        // Create kubeflow job based on generated kubeflow job resource config
        await this.kubernetesCRDClient.createKubernetesJob(frameworkcontrollerJobConfig);
    }

    /**
     * upload local folder to nfs or azureStroage
     */
    private async uploadFolder(srcDirectory: string, destDirectory: string): Promise<string> {
        if (this.config.storage.storageType === 'azureStorage') {
            if (this.azureStorageClient === undefined) {
                throw new Error('azureStorageClient is not initialized');
            }
            return await this.uploadFolderToAzureStorage(srcDirectory, destDirectory, 2);
        } else {
            // do not need to upload files to nfs server, temp folder already mounted to nfs
            return `nfs://${this.config.storage.server}:${destDirectory}`;
        }
    }

    /**
     * generate trial's command for frameworkcontroller
     * expose port and execute injector.sh before executing user's command
     * @param command
     */
    private generateCommandScript(taskRoles: FrameworkControllerTaskRoleConfig[], command: string): string {
        let portScript: string = '';
        for (const taskRole of taskRoles) {
            portScript += `FB_${taskRole.name.toUpperCase()}_PORT=${this.fcContainerPortMap.get(
                taskRole.name
            )} `;
        }
        return `${portScript} . /mnt/frameworkbarrier/injector.sh && ${command}`;
    }
    
    private async prepareFrameworkControllerConfig(envId: string, trialWorkingFolder: string, frameworkcontrollerJobName: string):
            Promise<any> {
        const podResources: any = [];
        for (const taskRole of this.config.taskRoles) {
            const resource: any = {};
            resource.requests = this.generatePodResource(toMegaBytes(taskRole.memorySize), taskRole.cpuNumber, taskRole.gpuNumber);
            resource.limits = {...resource.requests};
            podResources.push(resource);
        }
        // Generate frameworkcontroller job resource config object
        const frameworkcontrollerJobConfig: any =
            await this.generateFrameworkControllerJobConfig(envId, trialWorkingFolder, frameworkcontrollerJobName, podResources);

        return Promise.resolve(frameworkcontrollerJobConfig);
    }
    
    private generateContainerPort(taskRoles: FrameworkControllerTrialConfigTemplate[]): void {
        if (taskRoles === undefined) {
            throw new Error('frameworkcontroller trial config is not initialized');
        }

        let port: number = 4000; //The default port used in container
        for (const index of taskRoles.keys()) {
            this.fcContainerPortMap.set(taskRoles[index].name, port);
            port += 1;
        }
    }

    /**
     * Generate frameworkcontroller resource config file
     * @param trialJobId trial job id
     * @param trialWorkingFolder working folder
     * @param frameworkcontrollerJobName job name
     * @param podResources  pod template
     */
    private async generateFrameworkControllerJobConfig(envId: string, trialWorkingFolder: string,
        frameworkcontrollerJobName: string, podResources: any): Promise<any> {

        const taskRoles: any = [];
        for (const index of this.config.taskRoles.keys()) {
            const containerPort: number | undefined = this.fcContainerPortMap.get(this.config.taskRoles[index].name);
            if (containerPort === undefined) {
                throw new Error('Container port is not initialized');
            }

            const taskRole: any = this.generateTaskRoleConfig(
                trialWorkingFolder,
                this.config.taskRoles[index].dockerImage,
                `run.sh`,
                podResources[index],
                containerPort,
                await this.createRegistrySecret(this.config.taskRoles[index].privateRegistryAuthPath)
            );
            taskRoles.push({
                name: this.config.taskRoles[index].name,
                taskNumber: this.config.taskRoles[index].taskNumber,
                frameworkAttemptCompletionPolicy: {
                    minFailedTaskCount: this.config.taskRoles[index].frameworkAttemptCompletionPolicy.minFailedTaskCount,
                    minSucceededTaskCount: this.config.taskRoles[index].frameworkAttemptCompletionPolicy.minSucceedTaskCount
                },
                task: taskRole
            });
        }

        return Promise.resolve({
            apiVersion: `frameworkcontroller.microsoft.com/v1`,
            kind: 'Framework',
            metadata: {
                name: frameworkcontrollerJobName,
                namespace: this.config.namespace ? this.config.namespace : "default",
                labels: {
                    app: this.NNI_KUBERNETES_TRIAL_LABEL,
                    expId: this.experimentId,
                    envId: envId
                }
            },
            spec: {
                executionType: 'Start',
                taskRoles: taskRoles
            }
        });
    }

    private generateTaskRoleConfig(trialWorkingFolder: string, replicaImage: string, runScriptFile: string,
        podResources: any, containerPort: number, privateRegistrySecretName: string | undefined): any {

        const volumeSpecMap: Map<string, object> = new Map<string, object>();
        if (this.config.storage.storageType === 'azureStorage') {
            volumeSpecMap.set('nniVolumes', [
                {
                    name: 'nni-vol',
                    azureFile: {
                        secretName: `${this.azureStorageSecretName}`,
                        shareName: `${this.azureStorageShare}`,
                        readonly: false
                    }
                }, {
                    name: 'frameworkbarrier-volume',
                    emptyDir: {}
                }]);
        } else {
            volumeSpecMap.set('nniVolumes', [
                {
                    name: 'nni-vol',
                    nfs: {
                        server: `${this.config.storage.server}`,
                        path: `${this.config.storage.path}`
                    }
                }, {
                    name: 'frameworkbarrier-volume',
                    emptyDir: {}
                }]);
        }

        const containers: any = [
            {
                name: 'framework',
                image: replicaImage,
                command: ['sh', `${path.join(trialWorkingFolder, runScriptFile)}`],
                volumeMounts: [
                    {
                        name: 'nni-vol',
                        mountPath: this.CONTAINER_MOUNT_PATH
                    }, {
                        name: 'frameworkbarrier-volume',
                        mountPath: '/mnt/frameworkbarrier'
                    }],
                resources: podResources,
                ports: [{
                    containerPort: containerPort
                }]
            }];

        const initContainers: any = [
            {
                name: 'frameworkbarrier',
                image: 'frameworkcontroller/frameworkbarrier',
                volumeMounts: [
                    {
                        name: 'frameworkbarrier-volume',
                        mountPath: '/mnt/frameworkbarrier'
                    }]
            }];

        const spec: any = {
            containers: containers,
            initContainers: initContainers,
            restartPolicy: 'OnFailure',
            volumes: volumeSpecMap.get('nniVolumes'),
            hostNetwork: false
        };
        if (privateRegistrySecretName) {
            spec.imagePullSecrets = [
                {
                    name: privateRegistrySecretName
                }
            ]
        }

        if (this.config.serviceAccountName !== undefined) {
            spec.serviceAccountName = this.config.serviceAccountName;
        }

        return {
            pod: {
                spec: spec
            }
        };
    }

    public async refreshEnvironmentsStatus(environments: EnvironmentInformation[]): Promise<void> {
        environments.forEach(async (environment) => {
            if (this.kubernetesCRDClient === undefined) {
                throw new Error("kubernetesCRDClient undefined")
            }
            const kubeflowJobName: string = `nniexp${this.experimentId}env${environment.id}`.toLowerCase();
            const kubernetesJobInfo = await this.kubernetesCRDClient.getKubernetesJob(kubeflowJobName);

            if (kubernetesJobInfo.status && kubernetesJobInfo.status.state) {
                const frameworkJobType: FrameworkControllerJobStatus = <FrameworkControllerJobStatus>kubernetesJobInfo.status.state;
                /* eslint-disable require-atomic-updates */
                switch (frameworkJobType) {
                    case 'AttemptCreationPending':
                    case 'AttemptCreationRequested':
                    case 'AttemptPreparing':
                        environment.setStatus('WAITING');
                        break;
                    case 'AttemptRunning':
                        environment.setStatus('RUNNING');
                        break;
                    case  'Completed': {
                        const completedJobType: FrameworkControllerJobCompleteStatus =
                          <FrameworkControllerJobCompleteStatus>kubernetesJobInfo.status.attemptStatus.completionStatus.type.name;
                        switch (completedJobType) {
                            case 'Succeeded':
                                environment.setStatus('SUCCEEDED');
                                break;
                            case 'Failed':
                                environment.setStatus('FAILED');
                                break;
                            default:
                        }
                        break;
                    }
                    default:
                }
                /* eslint-enable require-atomic-updates */
            }
        });
    }
}
