import * as plugins from './npmci.plugins'
import * as paths from './npmci.paths'
import * as NpmciEnv from './npmci.env'
import {bashBare} from './npmci.bash'

/**
 * builds a cwd of Dockerfiles by triggering a promisechain
 */
export let build = function(){
    let done = plugins.q.defer()
    readDockerfiles()
        .then(sortDockerfiles)
        .then(mapDockerfiles)
        .then(buildDockerfiles)
        .then(pushDockerfiles)
        .then(() => {
            done.resolve()
        })
    return done.promise
}

/**
 * creates instance of class Dockerfile for all Dockerfiles in cwd
 * @returns Promise<Dockerfile[]>
 */
export let readDockerfiles = function(): plugins.q.Promise<Dockerfile[]>{
    let done = plugins.q.defer<Dockerfile[]>()
    let readDockerfilesArray: Dockerfile[] = []
    plugins.gulp.src('./Dockerfile*')
        .pipe(plugins.through2.obj(function(file,enc,cb){
            let myDockerfile = new Dockerfile({
                filePath: file.path,
                read: true
            })
            readDockerfilesArray.push(myDockerfile)
            cb(null,file)
         },function(){
             done.resolve(readDockerfilesArray)
         }))
    return done.promise
}

/**
 * sorts Dockerfiles into a dependency chain
 * @param sortableArrayArg an array of instances of class Dockerfile
 * @returns Promise<Dockerfile[]>
 */
export let sortDockerfiles = function(sortableArrayArg: Dockerfile[]): plugins.q.Promise<Dockerfile[]>{
    let done = plugins.q.defer<Dockerfile[]>()
    let sortedArray: Dockerfile[] = []
    let cleanTagsOriginal = cleanTagsArrayFunction(sortableArrayArg,sortedArray)
    let sorterFunctionCounter: number = 0
    let sorterFunction = function(){
        sortableArrayArg.forEach((dockerfileArg) => {
            let cleanTags = cleanTagsArrayFunction(sortableArrayArg,sortedArray)
            if (cleanTags.indexOf(dockerfileArg.baseImage) === -1 && sortedArray.indexOf(dockerfileArg) === -1) {
                sortedArray.push(dockerfileArg)
            };
            if (cleanTagsOriginal.indexOf(dockerfileArg.baseImage) !== -1) {
                dockerfileArg.localBaseImageDependent = true
            };
        })
        if (sortableArrayArg.length === sortedArray.length) {
            done.resolve(sortedArray)
        } else if (sorterFunctionCounter < 10) {
            sorterFunctionCounter++
            sorterFunction()
        };
    }
    sorterFunction()
    return done.promise
}

/**
 * maps local Dockerfiles dependencies to the correspoding Dockerfile class instances
 */
export let mapDockerfiles = function(sortedArray: Dockerfile[]): plugins.q.Promise<Dockerfile[]>{
    let done = plugins.q.defer<Dockerfile[]>()
    sortedArray.forEach((dockerfileArg) => {
        if (dockerfileArg.localBaseImageDependent) {
            sortedArray.forEach((dockfile2: Dockerfile) => {
                if (dockfile2.cleanTag === dockerfileArg.baseImage) {
                    dockerfileArg.localBaseDockerfile = dockfile2
                }
            })
        };
    })
    done.resolve(sortedArray)
    return done.promise
}

/**
 * builds the correspoding real docker image for each Dockerfile class instance
 */
export let buildDockerfiles = (sortedArrayArg: Dockerfile[]) => {
    let done = plugins.q.defer()
    sortedArrayArg.forEach(function(dockerfileArg){
        dockerfileArg.build()
    })
    done.resolve(sortedArrayArg)
    return done.promise
}

/**
 * pushes the real Dockerfile images to a Docker registry
 */
export let pushDockerfiles = function(sortedArrayArg: Dockerfile[]){
    let done = plugins.q.defer()
    sortedArrayArg.forEach(function(dockerfileArg){
        dockerfileArg.push(NpmciEnv.buildStage)
    })
    done.resolve(sortedArrayArg)
    return done.promise
}

/**
 * pulls corresponding real Docker images for instances of Dockerfile from a registry.
 * This is needed if building, testing, and publishing of Docker images is carried out in seperate CI stages.
 */
export let pullDockerfileImages = (sortableArrayArg: Dockerfile[],registryArg = 'registry.gitlab.com') => {
    let done = plugins.q.defer()
    sortableArrayArg.forEach((dockerfileArg) => {
        dockerfileArg.pull(registryArg)
    })
    done.resolve(sortableArrayArg)
    return done.promise
}

/**
 * tests all Dockerfiles in by calling class Dockerfile.test();
 * @param sortedArrayArg Dockerfile[] that contains all Dockerfiles in cwd
 */
export let testDockerfiles = (sortedArrayArg: Dockerfile[]) => {
    let done = plugins.q.defer()
    sortedArrayArg.forEach(function(dockerfileArg){
        dockerfileArg.test()
    })
    done.resolve(sortedArrayArg)
    return done.promise
}

/**
 * class Dockerfile represents a Dockerfile on disk in npmci
 */
export class Dockerfile {
    filePath: string
    repo: string
    version: string
    cleanTag: string
    buildTag: string
    testTag: string
    releaseTag: string
    containerName: string
    content: string
    baseImage: string
    localBaseImageDependent: boolean
    localBaseDockerfile: Dockerfile
    constructor(options: {filePath?: string,fileContents?: string|Buffer,read?: boolean}) {
        this.filePath = options.filePath
        this.repo = NpmciEnv.repo.user + '/' + NpmciEnv.repo.repo
        this.version = dockerFileVersion(plugins.path.parse(options.filePath).base)
        this.cleanTag = this.repo + ':' + this.version
        this.buildTag = this.cleanTag
        this.testTag = dockerTag('registry.gitlab.com',this.repo,this.version,'test')
        this.releaseTag = dockerTag(NpmciEnv.dockerRegistry,this.repo,this.version)
        this.containerName = 'dockerfile-' + this.version
        if (options.filePath && options.read) {
            this.content = plugins.smartfile.fs.toStringSync(plugins.path.resolve(options.filePath))
        };
        this.baseImage = dockerBaseImage(this.content)
        this.localBaseImageDependent = false
    };

    /**
     * builds the Dockerfile
     */
    build() {
        let done = plugins.q.defer()
        plugins.beautylog.info('now building Dockerfile for ' + this.cleanTag)
        bashBare('docker build -t ' + this.buildTag + ' -f ' + this.filePath + ' .')
        NpmciEnv.dockerFilesBuilt.push(this)
        done.resolve()
        return done.promise
    };

    /**
     * pushes the Dockerfile to a registry
     */
    push(stageArg) {
        let done = plugins.q.defer()
        let pushTag
        switch (stageArg) {
            case 'release':
                pushTag = this.releaseTag
                break
            case 'test':
            default:
                pushTag = this.testTag
                break
        }
        bashBare('docker tag ' + this.buildTag + ' ' + pushTag)
        bashBare('docker push ' + pushTag)
        done.resolve()
        return done.promise
    };

    /**
     * pulls the Dockerfile from a registry
     */
    pull(registryArg: string) {
        let pullTag = this.testTag
        bashBare('docker pull ' + pullTag)
        bashBare('docker tag ' + pullTag + ' ' + this.buildTag)
    };

    /**
     * tests the Dockerfile;
     */
    test() {
        let testFile: string = plugins.path.join(paths.NpmciTestDir,'test_' + this.version + '.sh')
        let testFileExists: boolean = plugins.smartfile.fs.fileExistsSync(testFile)
        if (testFileExists) {
            bashBare('docker run --name npmci_test_container ' + this.buildTag + ' mkdir /npmci_test')
            bashBare('docker cp ' + testFile + ' npmci_test_container:/npmci_test/test.sh')
            bashBare('docker commit npmci_test_container npmci_test_image')
            bashBare('docker run npmci_test_image sh /npmci_test/test.sh')
            bashBare('docker rm npmci_test_container')
            bashBare('docker rmi --force npmci_test_image')
        } else {
            plugins.beautylog.warn('skipping tests for ' + this.cleanTag + ' because no testfile was found!')
        }
    };

    /**
     * gets the id of a Dockerfile
     */
    getId() {
        let containerId = bashBare('docker inspect --type=image --format=\"{{.Id}}\" ' + this.buildTag)
        return containerId
    };
}

/**
 * 
 */
export let dockerFileVersion = function(dockerfileNameArg: string): string{
    let versionString: string
    let versionRegex = /Dockerfile_([a-zA-Z0-9\.]*)$/
    let regexResultArray = versionRegex.exec(dockerfileNameArg)
    if (regexResultArray && regexResultArray.length === 2) {
        versionString = regexResultArray[1]
    } else {
        versionString = 'latest'
    }
    return versionString
}

/**
 * 
 */
export let dockerBaseImage = function(dockerfileContentArg: string){
    let baseImageRegex = /FROM\s([a-zA-z0-9\/\-\:]*)\n?/
    let regexResultArray = baseImageRegex.exec(dockerfileContentArg)
    return regexResultArray[1]
}

/**
 * 
 */
export let dockerTag = function(registryArg: string,repoArg: string,versionArg: string,suffixArg?: string): string{
    let tagString: string
    let registry = registryArg
    let repo = repoArg
    let version = versionArg
    if (suffixArg) {
        version = versionArg + '_' + suffixArg
    };
    tagString = registry + '/' + repo + ':' + version
    return tagString
}

/**
 * 
 */
export let cleanTagsArrayFunction = function(dockerfileArrayArg: Dockerfile[],trackingArrayArg: Dockerfile[]): string[]{
    let cleanTagsArray: string[] = []
    dockerfileArrayArg.forEach(function(dockerfileArg){
        if (trackingArrayArg.indexOf(dockerfileArg) === -1) {
            cleanTagsArray.push(dockerfileArg.cleanTag)
        }
    })
    return cleanTagsArray
}