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

'use strict';

import { Container, Scope } from 'typescript-ioc';

import * as fs from 'fs';
import * as component from './common/component';
import { Database, DataStore } from './common/datastore';
import { setExperimentStartupInfo } from './common/experimentStartupInfo';
import { getLogger, Logger, logLevelNameMap } from './common/log';
import { Manager, ExperimentStartUpMode } from './common/manager';
import { TrainingService } from './common/trainingService';
import { getLogDir, mkDirP, parseArg, uniqueString } from './common/utils';
import { NNIDataStore } from './core/nniDataStore';
import { NNIManager } from './core/nnimanager';
import { SqlDB } from './core/sqlDatabase';
import { NNIRestServer } from './rest_server/nniRestServer';
import { FrameworkControllerTrainingService } from './training_service/kubernetes/frameworkcontroller/frameworkcontrollerTrainingService';
import { KubeflowTrainingService } from './training_service/kubernetes/kubeflow/kubeflowTrainingService';
import { LocalTrainingService } from './training_service/local/localTrainingService';
import { PAITrainingService } from './training_service/pai/paiTrainingService';
import {
    RemoteMachineTrainingService
} from './training_service/remote_machine/remoteMachineTrainingService';

function initStartupInfo(
    startExpMode: string, resumeExperimentId: string, basePort: number,
    logDirectory: string, experimentLogLevel: string, readonly: boolean): void {
    const createNew: boolean = (startExpMode === ExperimentStartUpMode.NEW);
    const expId: string = createNew ? uniqueString(8) : resumeExperimentId;
    setExperimentStartupInfo(createNew, expId, basePort, logDirectory, experimentLogLevel, readonly);
}

async function initContainer(platformMode: string, logFileName?: string): Promise<void> {
    if (platformMode === 'local') {
        Container.bind(TrainingService)
            .to(LocalTrainingService)
            .scope(Scope.Singleton);
    } else if (platformMode === 'remote') {
        Container.bind(TrainingService)
            .to(RemoteMachineTrainingService)
            .scope(Scope.Singleton);
    } else if (platformMode === 'pai') {
        Container.bind(TrainingService)
            .to(PAITrainingService)
            .scope(Scope.Singleton);
    } else if (platformMode === 'kubeflow') {
        Container.bind(TrainingService)
            .to(KubeflowTrainingService)
            .scope(Scope.Singleton);
    } else if (platformMode === 'frameworkcontroller') {
        Container.bind(TrainingService)
            .to(FrameworkControllerTrainingService)
            .scope(Scope.Singleton);
    } else {
        throw new Error(`Error: unsupported mode: ${platformMode}`);
    }
    Container.bind(Manager)
        .to(NNIManager)
        .scope(Scope.Singleton);
    Container.bind(Database)
        .to(SqlDB)
        .scope(Scope.Singleton);
    Container.bind(DataStore)
        .to(NNIDataStore)
        .scope(Scope.Singleton);
    Container.bind(Logger).provider({
        get: (): Logger => new Logger(logFileName)
    });
    const ds: DataStore = component.get(DataStore);

    await ds.init();
}

function usage(): void {
    console.info('usage: node main.js --port <port> --mode \
    <local/remote/pai/kubeflow/frameworkcontroller> --start_mode <new/resume> --experiment_id <id>');
}

const strPort: string = parseArg(['--port', '-p']);
if (!strPort || strPort.length === 0) {
    usage();
    process.exit(1);
}

const port: number = parseInt(strPort, 10);

const mode: string = parseArg(['--mode', '-m']);
if (!['local', 'remote', 'pai', 'kubeflow', 'frameworkcontroller'].includes(mode)) {
    console.log(`FATAL: unknown mode: ${mode}`);
    usage();
    process.exit(1);
}

const startMode: string = parseArg(['--start_mode', '-s']);
if (![ExperimentStartUpMode.NEW, ExperimentStartUpMode.RESUME].includes(startMode)) {
    console.log(`FATAL: unknown start_mode: ${startMode}`);
    usage();
    process.exit(1);
}

const experimentId: string = parseArg(['--experiment_id', '-id']);
if ((startMode === ExperimentStartUpMode.RESUME) && experimentId.trim().length < 1) {
    console.log(`FATAL: cannot resume the experiment, invalid experiment_id: ${experimentId}`);
    usage();
    process.exit(1);
}

const logDir: string = parseArg(['--log_dir', '-ld']);
if (logDir.length > 0) {
    if (!fs.existsSync(logDir)) {
        console.log(`FATAL: log_dir ${logDir} does not exist`);
    }
}

const logLevel: string = parseArg(['--log_level', '-ll']);
if (logLevel.length > 0 && !logLevelNameMap.has(logLevel)) {
    console.log(`FATAL: invalid log_level: ${logLevel}`);
}

const readonlyArg: string = parseArg(['--readonly', '-r']);
if (!('true' || 'false').includes(readonlyArg.toLowerCase())) {
    console.log(`FATAL: readonly property should only be true or false`);
    usage();
    process.exit(1);
}
const readonly = readonlyArg.toLowerCase() == 'true' ? true : false;

initStartupInfo(startMode, experimentId, port, logDir, logLevel, readonly);

mkDirP(getLogDir())
    .then(async () => {
    try {
        await initContainer(mode);
        const restServer: NNIRestServer = component.get(NNIRestServer);
        await restServer.start();
        const log: Logger = getLogger();
        log.info(`Rest server listening on: ${restServer.endPoint}`);
    } catch (err) {
        const log: Logger = getLogger();
        log.error(`${err.stack}`);
        throw err;
    }
})
.catch((err: Error) => {
    console.error(`Failed to create log dir: ${err.stack}`);
});

function getStopSignal(): any {
    if (process.platform === "win32") {
        return 'SIGBREAK';
    }
    else{
        return 'SIGTERM';
    }
}

process.on(getStopSignal(), async () => {
    const log: Logger = getLogger();
    let hasError: boolean = false;
    try {
        const nniManager: Manager = component.get(Manager);
        await nniManager.stopExperiment();
        const ds: DataStore = component.get(DataStore);
        await ds.close();
        const restServer: NNIRestServer = component.get(NNIRestServer);
        await restServer.stop();
    } catch (err) {
        hasError = true;
        log.error(`${err.stack}`);
    } finally {
        await log.close();
        process.exit(hasError ? 1 : 0);
    }
});