import _ from "lodash";
import TimeSeries from "app/core/time_series2";
import colors from "app/core/utils/colors";

export class DataProcessor {
  constructor(private panel) {}

  getSeriesList(options) {
    if (!options.dataList || options.dataList.length === 0) {
      return [];
    }

    // auto detect xaxis mode
    var firstItem;
    if (options.dataList && options.dataList.length > 0) {
      firstItem = options.dataList[0];
      let autoDetectMode = this.getAutoDetectXAxisMode(firstItem);
      if (this.panel.xaxis.mode !== autoDetectMode) {
        this.panel.xaxis.mode = autoDetectMode;
        this.setPanelDefaultsForNewXAxisMode();
      }
    }

    switch (this.panel.xaxis.mode) {
      case "series":
      case "time": {
        return options.dataList.map((item, index) => {
          return this.timeSeriesHandler(item, index, options);
        });
      }
      case "histogram": {
        let histogramDataList = [
          {
            target: "count",
            datapoints: _.concat(
              [],
              _.flatten(_.map(options.dataList, "datapoints"))
            )
          }
        ];
        return histogramDataList.map((item, index) => {
          return this.timeSeriesHandler(item, index, options);
        });
      }
      case "field": {
        return this.customHandler(firstItem);
      }
    }
  }

  getAutoDetectXAxisMode(firstItem) {
    switch (firstItem.type) {
      case "docs":
        return "field";
      case "table":
        return "field";
      default: {
        if (this.panel.xaxis.mode === "series") {
          return "series";
        }
        if (this.panel.xaxis.mode === "histogram") {
          return "histogram";
        }
        return "time";
      }
    }
  }

  setPanelDefaultsForNewXAxisMode() {
    switch (this.panel.xaxis.mode) {
      case "time": {
        this.panel.bars = false;
        this.panel.lines = true;
        this.panel.points = false;
        this.panel.legend.show = true;
        this.panel.tooltip.shared = true;
        this.panel.xaxis.values = [];
        break;
      }
      case "series": {
        this.panel.bars = true;
        this.panel.lines = false;
        this.panel.points = false;
        this.panel.stack = false;
        this.panel.legend.show = false;
        this.panel.tooltip.shared = false;
        this.panel.xaxis.values = ["total"];
        break;
      }
      case "histogram": {
        this.panel.bars = true;
        this.panel.lines = false;
        this.panel.points = false;
        this.panel.stack = false;
        this.panel.legend.show = false;
        this.panel.tooltip.shared = false;
        break;
      }
    }
  }

  timeSeriesHandler(seriesData, index, options) {
    var datapoints = seriesData.datapoints || [];
    var alias = seriesData.target;

    var colorIndex = index % colors.length;
    var color = this.panel.aliasColors[alias] || colors[colorIndex];

    var series = new TimeSeries({
      datapoints: datapoints,
      alias: alias,
      color: color,
      unit: seriesData.unit
    });

    if (datapoints && datapoints.length > 0) {
      var last = datapoints[datapoints.length - 1][1];
      var from = options.range.from;
      if (last - from < -10000) {
        series.isOutsideRange = true;
      }
    }

    return series;
  }

  customHandler(dataItem) {
    let nameField = this.panel.xaxis.name;
    if (!nameField) {
      throw {
        message:
          "No field name specified to use for x-axis, check your axes settings"
      };
    }
    return [];
  }

  validateXAxisSeriesValue() {
    switch (this.panel.xaxis.mode) {
      case "series": {
        if (this.panel.xaxis.values.length === 0) {
          this.panel.xaxis.values = ["total"];
          return;
        }

        var validOptions = this.getXAxisValueOptions({});
        var found = _.find(validOptions, { value: this.panel.xaxis.values[0] });
        if (!found) {
          this.panel.xaxis.values = ["total"];
        }
        return;
      }
    }
  }

  getDataFieldNames(dataList, onlyNumbers) {
    if (dataList.length === 0) {
      return [];
    }

    let fields = [];
    var firstItem = dataList[0];
    let fieldParts = [];

    function getPropertiesRecursive(obj) {
      _.forEach(obj, (value, key) => {
        if (_.isObject(value)) {
          fieldParts.push(key);
          getPropertiesRecursive(value);
        } else {
          if (!onlyNumbers || _.isNumber(value)) {
            let field = fieldParts.concat(key).join(".");
            fields.push(field);
          }
        }
      });
      fieldParts.pop();
    }

    if (firstItem.type === "docs") {
      if (firstItem.datapoints.length === 0) {
        return [];
      }
      getPropertiesRecursive(firstItem.datapoints[0]);
    }

    return fields;
  }

  getXAxisValueOptions(options) {
    switch (this.panel.xaxis.mode) {
      case "series": {
        return [
          { text: "Avg", value: "avg" },
          { text: "Min", value: "min" },
          { text: "Max", value: "max" },
          { text: "Total", value: "total" },
          { text: "Count", value: "count" }
        ];
      }
    }

    return [];
  }

  pluckDeep(obj: any, property: string) {
    let propertyParts = property.split(".");
    let value = obj;
    for (let i = 0; i < propertyParts.length; ++i) {
      if (value[propertyParts[i]]) {
        value = value[propertyParts[i]];
      } else {
        return undefined;
      }
    }
    return value;
  }
}