import angular from 'angular';
import moment from 'moment';
import filesizeParser from 'filesize-parser';
import KubernetesResourceReservationHelper from 'Kubernetes/helpers/resourceReservationHelper';
import { PORTAINER_FADEOUT } from '@/constants';
import { getMetricsForNode } from '@/react/kubernetes/services/service.ts';

class KubernetesNodeStatsController {
  /* @ngInject */
  constructor($async, $state, $interval, $document, Notifications, KubernetesNodeService, ChartService) {
    this.$async = $async;
    this.$state = $state;
    this.$interval = $interval;
    this.$document = $document;
    this.Notifications = Notifications;
    this.KubernetesNodeService = KubernetesNodeService;
    this.ChartService = ChartService;

    this.onInit = this.onInit.bind(this);
    this.initCharts = this.initCharts.bind(this);
  }

  changeUpdateRepeater() {
    var cpuChart = this.cpuChart;
    var memoryChart = this.memoryChart;

    this.stopRepeater();
    this.setUpdateRepeater(cpuChart, memoryChart);
    $('#refreshRateChange').show();
    $('#refreshRateChange').fadeOut(PORTAINER_FADEOUT);
  }

  updateCPUChart() {
    const label = moment(this.stats.read).format('HH:mm:ss');
    this.ChartService.UpdateCPUChart(label, this.stats.CPUUsage, this.cpuChart);
  }

  updateMemoryChart() {
    const label = moment(this.stats.read).format('HH:mm:ss');
    this.ChartService.UpdateMemoryChart(label, this.stats.MemoryUsage, 0, this.memoryChart);
  }

  stopRepeater() {
    var repeater = this.repeater;
    if (angular.isDefined(repeater)) {
      this.$interval.cancel(repeater);
      this.repeater = undefined;
    }
  }

  setUpdateRepeater() {
    const refreshRate = this.state.refreshRate;

    this.repeater = this.$interval(async () => {
      try {
        await this.getStats();
        this.updateCPUChart();
        this.updateMemoryChart();
      } catch (error) {
        this.stopRepeater();
        this.Notifications.error('Failure', error);
      }
    }, refreshRate * 1000);
  }

  initCharts() {
    const findCharts = setInterval(() => {
      let cpuChartCtx = $('#cpuChart');
      let memoryChartCtx = $('#memoryChart');
      if (cpuChartCtx.length !== 0 && memoryChartCtx.length !== 0) {
        const cpuChart = this.ChartService.CreateCPUChart(cpuChartCtx);
        this.cpuChart = cpuChart;
        const memoryChart = this.ChartService.CreateMemoryChart(memoryChartCtx);
        this.memoryChart = memoryChart;
        this.updateCPUChart();
        this.updateMemoryChart();
        this.setUpdateRepeater();
        clearInterval(findCharts);
      }
    }, 200);
  }

  getStats() {
    return this.$async(async () => {
      try {
        const stats = await getMetricsForNode(this.$state.params.endpointId, this.state.transition.nodeName);
        if (stats) {
          const memory = filesizeParser(stats.usage.memory);
          const cpu = KubernetesResourceReservationHelper.parseCPU(stats.usage.cpu);
          this.stats = {
            read: stats.metadata.creationTimestamp,
            MemoryUsage: memory,
            CPUUsage: (cpu / this.nodeCPU) * 100,
          };
        }
      } catch (err) {
        this.Notifications.error('Failure', err, 'Unable to retrieve node stats');
      }
    });
  }

  $onDestroy() {
    this.stopRepeater();
  }

  async onInit() {
    this.state = {
      autoRefresh: false,
      refreshRate: '30',
      viewReady: false,
      transition: {
        nodeName: this.$transition$.params().name,
      },
      getMetrics: true,
    };

    try {
      const nodeMetrics = await getMetricsForNode(this.$state.params.endpointId, this.state.transition.nodeName);

      if (nodeMetrics) {
        const node = await this.KubernetesNodeService.get(this.state.transition.nodeName);
        this.nodeCPU = node.CPU || 1;

        await this.getStats();
      } else {
        this.state.getMetrics = false;
      }
    } catch (err) {
      this.state.getMetrics = false;
      this.Notifications.error('Failure', err, 'Unable to retrieve node stats');
    } finally {
      this.state.viewReady = true;
      if (this.state.getMetrics) {
        this.$document.ready(() => {
          this.initCharts();
        });
      }
    }
  }

  $onInit() {
    return this.$async(this.onInit);
  }
}

export default KubernetesNodeStatsController;
angular.module('portainer.kubernetes').controller('KubernetesNodeStatsController', KubernetesNodeStatsController);