angular.module('stats', [])
.controller('StatsController', ['Pagination', '$scope', 'Messages', '$timeout', 'Container', 'ContainerTop', '$stateParams', 'humansizeFilter', '$sce', '$document',
function (Pagination, $scope, Messages, $timeout, Container, ContainerTop, $stateParams, humansizeFilter, $sce, $document) {
  // TODO: Force scale to 0-100 for cpu, fix charts on dashboard,
  // TODO: Force memory scale to 0 - max memory
  $scope.ps_args = '';
  $scope.state = {};
  $scope.state.pagination_count = Pagination.getPaginationCount('stats_processes');
  $scope.sortType = 'CMD';
  $scope.sortReverse = false;
  $scope.order = function (sortType) {
    $scope.sortReverse = ($scope.sortType === sortType) ? !$scope.sortReverse : false;
    $scope.sortType = sortType;
  };
  $scope.changePaginationCount = function() {
    Pagination.setPaginationCount('stats_processes', $scope.state.pagination_count);
  };
  $scope.getTop = function () {
      ContainerTop.get($stateParams.id, {
          ps_args: $scope.ps_args
      }, function (data) {
          $scope.containerTop = data;
      });
  };
  var destroyed = false;
  var timeout;
  $document.ready(function(){
    var cpuLabels = [];
    var cpuData = [];
    var memoryLabels = [];
    var memoryData = [];
    var networkLabels = [];
    var networkTxData = [];
    var networkRxData = [];
    for (var i = 0; i < 20; i++) {
      cpuLabels.push('');
      cpuData.push(0);
      memoryLabels.push('');
      memoryData.push(0);
      networkLabels.push('');
      networkTxData.push(0);
      networkRxData.push(0);
    }
    var cpuDataset = { // CPU Usage
      fillColor: "rgba(151,187,205,0.5)",
      strokeColor: "rgba(151,187,205,1)",
      pointColor: "rgba(151,187,205,1)",
      pointStrokeColor: "#fff",
      data: cpuData
    };
    var memoryDataset = {
      fillColor: "rgba(151,187,205,0.5)",
      strokeColor: "rgba(151,187,205,1)",
      pointColor: "rgba(151,187,205,1)",
      pointStrokeColor: "#fff",
      data: memoryData
    };
    var networkRxDataset = {
      label: "Rx Bytes",
      fillColor: "rgba(151,187,205,0.5)",
      strokeColor: "rgba(151,187,205,1)",
      pointColor: "rgba(151,187,205,1)",
      pointStrokeColor: "#fff",
      data: networkRxData
    };
    var networkTxDataset = {
      label: "Tx Bytes",
      fillColor: "rgba(255,180,174,0.5)",
      strokeColor: "rgba(255,180,174,1)",
      pointColor: "rgba(255,180,174,1)",
      pointStrokeColor: "#fff",
      data: networkTxData
    };
    var networkLegendData = [
      {
        //value: '',
        color: 'rgba(151,187,205,0.5)',
        title: 'Rx Data'
      },
      {
        //value: '',
        color: 'rgba(255,180,174,0.5)',
        title: 'Tx Data'
      }
    ];

    legend($('#network-legend').get(0), networkLegendData);

    Chart.defaults.global.animationSteps = 30; // Lower from 60 to ease CPU load.
    var cpuChart = new Chart($('#cpu-stats-chart').get(0).getContext("2d")).Line({
      labels: cpuLabels,
      datasets: [cpuDataset]
    }, {
      responsive: true
    });

    var memoryChart = new Chart($('#memory-stats-chart').get(0).getContext('2d')).Line({
      labels: memoryLabels,
      datasets: [memoryDataset]
    },
    {
      scaleLabel: function (valueObj) {
        return humansizeFilter(parseInt(valueObj.value, 10), 2);
      },
      responsive: true
      //scaleOverride: true,
      //scaleSteps: 10,
      //scaleStepWidth: Math.ceil(initialStats.memory_stats.limit / 10),
      //scaleStartValue: 0
    });
    var networkChart = new Chart($('#network-stats-chart').get(0).getContext("2d")).Line({
      labels: networkLabels,
      datasets: [networkRxDataset, networkTxDataset]
    }, {
      scaleLabel: function (valueObj) {
        return humansizeFilter(parseInt(valueObj.value, 10), 2);
      },
      responsive: true
    });
    $scope.networkLegend = $sce.trustAsHtml(networkChart.generateLegend());


    function updateStats() {
      Container.stats({id: $stateParams.id}, function (d) {
        var arr = Object.keys(d).map(function (key) {
          return d[key];
        });
        if (arr.join('').indexOf('no such id') !== -1) {
          Messages.error('Unable to retrieve stats', {}, 'Is this container running?');
          return;
        }

        // Update graph with latest data
        $scope.data = d;
        updateCpuChart(d);
        updateMemoryChart(d);
        updateNetworkChart(d);
        setUpdateStatsTimeout();
      }, function () {
        Messages.error('Unable to retrieve stats', {}, 'Is this container running?');
        setUpdateStatsTimeout();
      });
    }


    $scope.$on('$destroy', function () {
      destroyed = true;
      $timeout.cancel(timeout);
    });

    updateStats();

    function updateCpuChart(data) {
      cpuChart.addData([calculateCPUPercent(data)], new Date(data.read).toLocaleTimeString());
      cpuChart.removeData();
    }

    function updateMemoryChart(data) {
      memoryChart.addData([data.memory_stats.usage], new Date(data.read).toLocaleTimeString());
      memoryChart.removeData();
    }

    var lastRxBytes = 0, lastTxBytes = 0;

    function updateNetworkChart(data) {
      // 1.9+ contains an object of networks, for now we'll just show stats for the first network
      // TODO: Show graphs for all networks
      if (data.networks) {
        $scope.networkName = Object.keys(data.networks)[0];
        data.network = data.networks[$scope.networkName];
      }
      if(data.network) {
        var rxBytes = 0, txBytes = 0;
        if (lastRxBytes !== 0 || lastTxBytes !== 0) {
          // These will be zero on first call, ignore to prevent large graph spike
          rxBytes = data.network.rx_bytes - lastRxBytes;
          txBytes = data.network.tx_bytes - lastTxBytes;
        }
        lastRxBytes = data.network.rx_bytes;
        lastTxBytes = data.network.tx_bytes;
        networkChart.addData([rxBytes, txBytes], new Date(data.read).toLocaleTimeString());
        networkChart.removeData();
      }
    }

    function calculateCPUPercent(stats) {
      // Same algorithm the official client uses: https://github.com/docker/docker/blob/master/api/client/stats.go#L195-L208
      var prevCpu = stats.precpu_stats;
      var curCpu = stats.cpu_stats;

      var cpuPercent = 0.0;

      // calculate the change for the cpu usage of the container in between readings
      var cpuDelta = curCpu.cpu_usage.total_usage - prevCpu.cpu_usage.total_usage;
      // calculate the change for the entire system between readings
      var systemDelta = curCpu.system_cpu_usage - prevCpu.system_cpu_usage;

      if (systemDelta > 0.0 && cpuDelta > 0.0) {
        cpuPercent = (cpuDelta / systemDelta) * curCpu.cpu_usage.percpu_usage.length * 100.0;
      }
      return cpuPercent;
    }

    function setUpdateStatsTimeout() {
      if(!destroyed) {
        timeout = $timeout(updateStats, 5000);
      }
    }
  });

  Container.get({id: $stateParams.id}, function (d) {
    $scope.container = d;
  }, function (e) {
    Messages.error("Failure", e, "Unable to retrieve container info");
  });
  $scope.getTop();
}]);