import { AppCommand, CommandArgs, CommandResult, help, failure, ErrorCodes, success, required, position, name } from "../../../util/commandline";
import { out } from "../../../util/interaction";
import { inspect } from "util";
import { AppCenterClient, models, clientRequest } from "../../../util/apis";
import { formatDate } from "./lib/date-helper";
import { scriptName } from "../../../util/misc";
import * as chalk from "chalk";

const debug = require("debug")("appcenter-cli:commands:codepush:deployments:history");

@help("Display the release history for a CodePush deployment")
export default class CodePushDeploymentHistoryCommand extends AppCommand {

  @help("Specifies CodePush deployment name to view history")
  @required
  @name("deployment-name")
  @position(0)
  public deploymentName: string;

  constructor(args: CommandArgs) {
    super(args);
  }

  async run(client: AppCenterClient): Promise<CommandResult> {
    const app = this.app;
    let releases: models.CodePushRelease[];
    let metrics: models.CodePushReleaseMetric[];
    try {
      const releasesHttpRequest = await out.progress("Getting CodePush releases...", clientRequest<models.CodePushRelease[]>(
        (cb) => client.codePushDeploymentReleases.get(this.deploymentName, app.ownerName, app.appName, cb)));
      releases = releasesHttpRequest.result;

      const metricsHttpRequest = await out.progress("Getting CodePush releases metrics...", clientRequest<models.CodePushReleaseMetric[]>(
        (cb) => client.codePushDeploymentMetrics.get(this.deploymentName, app.ownerName, app.appName, cb)));
      metrics = metricsHttpRequest.result;

      const releasesTotalActive = metrics.reduce((sum, releaseMetrics) => sum += releaseMetrics.active, 0);

      let tableTitles: string[] = ["Label", "Release Time", "App Version", "Mandatory", "Description", "Install Metrics"];
      tableTitles = tableTitles.map((title) => chalk.cyan(title));

      out.table(
        out.getCommandOutputTableOptions(tableTitles),
        releases.map((release) => {
          let releaseRow: string[] = [
            release.label,
            formatDate(release.uploadTime) + this.generateReleaseAdditionalInfoString(release),
            release.targetBinaryRange,
            (release.isMandatory) ? "Yes" : "No",
            release.description,
            this.generateReleaseMetricsString(release, metrics, releasesTotalActive)
          ];

          if (release.isDisabled) {
            releaseRow = releaseRow.map((element) => this.applyDimChalkSkippingLineBreaks(element));
          }

          return releaseRow;
        })
      );
      return success();
    } catch (error) {
      debug(`Failed to get list of CodePush deployments - ${inspect(error)}`);
      if (error.statusCode === 404) {
        const appNotFoundErrorMsg = `The app ${this.identifier} does not exist. Please double check the name, and provide it in the form owner/appname. \nRun the command ${chalk.bold(`${scriptName} apps list`)} to see what apps you have access to.`;
        return failure(ErrorCodes.NotFound, appNotFoundErrorMsg);
      } else if (error.statusCode === 400) {
        const deploymentNotExistErrorMsg = `The deployment ${chalk.bold(this.deploymentName)} does not exist.`;
        return failure(ErrorCodes.Exception, deploymentNotExistErrorMsg);
      } else {
        return failure(ErrorCodes.Exception, error.response.body);
      }
    }
  }

  private generateReleaseAdditionalInfoString(release: models.CodePushRelease): string {
    let additionalInfo = "";
    if (release.releaseMethod === "Promote") {
      additionalInfo = `(Promoted ${release.originalLabel} from ${release.originalDeployment})`;
    } else if (release.releaseMethod === "Rollback") {
      const labelNumber = parseInt(release.label.substring(1), 10);
      const previousReleaseLabel = "v" + (labelNumber - 1);
      additionalInfo = `(Rolled back ${previousReleaseLabel} to ${release.originalLabel})`;
    }

    return (additionalInfo) ? "\n" + chalk.magenta(additionalInfo) : "";
  }

  private generateReleaseMetricsString(release: models.CodePushRelease, metrics: models.CodePushReleaseMetric[], releasesTotalActive: number): string {
    let metricsString = "";

    const releaseMetrics: models.CodePushReleaseMetric = metrics.find((metric) => metric.label === release.label);
    if (releaseMetrics) {

      const activePercent = (releasesTotalActive) ? releaseMetrics.active / releasesTotalActive * 100 : 0.0;
      let percentString: string;
      if (activePercent === 100.0) {
        percentString = "100%";
      } else if (activePercent === 0.0) {
        percentString = "0%";
      } else {
        percentString = activePercent.toPrecision(2) + "%";
      }

      metricsString += chalk.green("Active: ") + percentString + ` (${releaseMetrics.active} of ${releasesTotalActive})`;

      if (releaseMetrics.installed != null) {
        metricsString += "\n" + chalk.green("Installed: ") + releaseMetrics.installed;

        const pending = releaseMetrics.downloaded - releaseMetrics.installed - releaseMetrics.failed;
        if (pending > 0) {
          metricsString += ` (${pending} pending)`;
        }
      }

      if (releaseMetrics.failed > 0) {
        metricsString += "\n" + chalk.green("Rollbacks: ") + chalk.red(releaseMetrics.failed.toString());
      }

    } else {
      metricsString = chalk.magenta("No installs recorded");
    }

    if (release.rollout != null && release.rollout !== 100) {
      metricsString += "\n" + chalk.green("Rollout: ") + release.rollout + "%";
    }

    if (release.isDisabled) {
      metricsString += "\n" + chalk.green("Disabled: ") + "Yes";
    }

    return metricsString;
  }

  private applyDimChalkSkippingLineBreaks(applyString: string): string {
    // Used to prevent "chalk" from applying styles to linebreaks which
    // causes table border chars to have the style applied as well.
    let chalkedString = "";
    if (applyString) {
      chalkedString = applyString
        .split("\n")
        .map((line) => chalk.dim(line))
        .join("\n");
    }
    return chalkedString;
  }
}