import * as tempy from "tempy";
import * as fs from "fs";
import * as yaml from "js-yaml";
import * as camelcaseKeys from "camelcase-keys";
import { promiseExec} from "./promise-exec"
import { helmCli } from "./helm-cli";
import { Cluster } from "./cluster";

export class HelmReleaseManager {

  public async listReleases(pathToKubeconfig: string, namespace?: string) {
    const helm = await helmCli.binaryPath()
    const namespaceFlag = namespace ? `-n ${namespace}` : "--all-namespaces"
    const { stdout, stderr } = await promiseExec(`"${helm}" ls --output json ${namespaceFlag} --kubeconfig ${pathToKubeconfig}`).catch((error) => { throw(error.stderr)})

    const output = JSON.parse(stdout)
    if (output.length == 0) {
      return output
    }
    const result: any = []
    output.forEach((release: any, index: number) => {
      output[index] = camelcaseKeys(release)
    });
    return output
  }


  public async installChart(chart: string, values: any, name: string, namespace: string, version: string, pathToKubeconfig: string){
    const helm = await helmCli.binaryPath()
    const fileName = tempy.file({name: "values.yaml"})
    await fs.promises.writeFile(fileName, yaml.safeDump(values))
    try {
      let generateName = ""
      if (!name) {
        generateName = "--generate-name"
        name = ""
      }
      const { stdout, stderr } = await promiseExec(`"${helm}" install ${name} ${chart} --version ${version} -f ${fileName} --namespace ${namespace} --kubeconfig ${pathToKubeconfig} ${generateName}`).catch((error) => { throw(error.stderr)})
      const releaseName = stdout.split("\n")[0].split(' ')[1].trim()
      return {
        log: stdout,
        release: {
          name: releaseName,
          namespace: namespace
        }
      }
    } finally {
      await fs.promises.unlink(fileName)
    }
  }

  public async upgradeRelease(name: string, chart: string, values: any, namespace: string, version: string, cluster: Cluster){
    const helm = await helmCli.binaryPath()
    const fileName = tempy.file({name: "values.yaml"})
    await fs.promises.writeFile(fileName, yaml.safeDump(values))

    try {
      const { stdout, stderr } = await promiseExec(`"${helm}" upgrade ${name} ${chart} --version ${version} -f ${fileName} --namespace ${namespace} --kubeconfig ${cluster.kubeconfigPath()}`).catch((error) => { throw(error.stderr)})
      return {
        log: stdout,
        release: this.getRelease(name, namespace, cluster)
      }
    } finally {
      await fs.promises.unlink(fileName)
    }
  }

  public async getRelease(name: string, namespace: string, cluster: Cluster) {
    const helm = await helmCli.binaryPath()
    const {stdout, stderr} = await promiseExec(`"${helm}" status ${name} --output json --namespace ${namespace} --kubeconfig ${cluster.kubeconfigPath()}`).catch((error) => { throw(error.stderr)})
    const release = JSON.parse(stdout)
    release.resources = await this.getResources(name, namespace, cluster)
    return release
  }

  public async deleteRelease(name: string, namespace: string, pathToKubeconfig: string) {
    const helm = await helmCli.binaryPath()
    const { stdout, stderr } = await promiseExec(`"${helm}" delete ${name} --namespace ${namespace} --kubeconfig ${pathToKubeconfig}`).catch((error) => { throw(error.stderr)})

    return stdout
  }

  public async getValues(name: string, namespace: string, pathToKubeconfig: string) {
    const helm = await helmCli.binaryPath()
    const { stdout, stderr } = await promiseExec(`"${helm}" get values ${name} --all --output yaml --namespace ${namespace} --kubeconfig ${pathToKubeconfig}`).catch((error) => { throw(error.stderr)})
    return stdout
  }

  public async getHistory(name: string, namespace: string, pathToKubeconfig: string) {
    const helm = await helmCli.binaryPath()
    const {stdout, stderr} = await promiseExec(`"${helm}" history ${name} --output json --namespace ${namespace} --kubeconfig ${pathToKubeconfig}`).catch((error) => { throw(error.stderr)})
    return JSON.parse(stdout)
  }

  public async rollback(name: string, namespace: string, revision: number, pathToKubeconfig: string) {
    const helm = await helmCli.binaryPath()
    const {stdout, stderr} = await promiseExec(`"${helm}" rollback ${name} ${revision} --namespace ${namespace} --kubeconfig ${pathToKubeconfig}`).catch((error) => { throw(error.stderr)})
    return stdout
  }

  protected async getResources(name: string, namespace: string, cluster: Cluster) {
    const helm = await helmCli.binaryPath()
    const kubectl = await cluster.kubeCtl.kubectlPath()
    const pathToKubeconfig = cluster.kubeconfigPath()
    const { stdout } = await promiseExec(`"${helm}" get manifest ${name} --namespace ${namespace} --kubeconfig ${pathToKubeconfig} | "${kubectl}" get -n ${namespace} --kubeconfig ${pathToKubeconfig} -f - -o=json`).catch((error) => {
      return { stdout: JSON.stringify({items: []})}
    })
    return stdout
  }
}

export const releaseManager = new HelmReleaseManager()