const _ = require('lodash')
const app = require('../app')

function trim (str) {
  return str.replace(/^\s+|\s+$/gm,'');
}

function rgbaToHex (rgba) {
  const parts = rgba.substring(rgba.indexOf("(")).split(","),
    r = parseInt(trim(parts[0].substring(1)), 10),
    g = parseInt(trim(parts[1]), 10),
    b = parseInt(trim(parts[2]), 10),
    a = parseFloat(trim(parts[3].substring(0, parts[3].length - 1))).toFixed(2)
    return ('#' + r.toString(16).padStart(2, 0) + g.toString(16).padStart(2, 0) + b.toString(16).padStart(2, 0))
}

app.service('statistics', function(api, $mdColors) {
  window.$mdColors = $mdColors
  const colors = [

    rgbaToHex($mdColors.getThemeColor('blue')),
    rgbaToHex($mdColors.getThemeColor('red')),
    rgbaToHex($mdColors.getThemeColor('amber')),
    rgbaToHex($mdColors.getThemeColor('teal')),
    rgbaToHex($mdColors.getThemeColor('deep-orange')),
    rgbaToHex($mdColors.getThemeColor('cyan')),
    rgbaToHex($mdColors.getThemeColor('purple')),
    rgbaToHex($mdColors.getThemeColor('lime')),
    rgbaToHex($mdColors.getThemeColor('indigo')),
    rgbaToHex($mdColors.getThemeColor('pink'))
  ]
  const chart = ({
    rows,
    seriesField,
    dataField,
    labelsField,
    format
  }) => {
    const labels = _.chain(rows).map(x => x[labelsField]).uniq().value()
    const series = _.chain(rows).map(x => x[seriesField]).uniq().value()
    const seriesData = _.chain(rows)
      .groupBy(x => x[seriesField])
      .toPairs()
      .map(([key, rows]) => [
        key,
        _.chain(rows)
          .map(row => [row[labelsField], row[dataField]])
          .fromPairs()
          .value()
      ])
      .fromPairs()
      .value()
    const data = series.map(s => {
      const sdata = seriesData[s]
      return labels.map(l => sdata[l])
    })

    return {
      labels,
      series,
      data,
      colors: colors.slice(0, series.length),
      options: {
        tooltips: {
          callbacks: {
            label: (tooltipItem, data) => {
              const label = data.datasets[tooltipItem.datasetIndex].label || ''
              const value = tooltipItem.yLabel
              return format ? format(label, value) : `${label}: ${value}`
            }
          }
        }
      }
    }
  }


  this.charts = (rows) => {
    return {
      delivery: chart({
        rows,
        seriesField: 'key',
        dataField: 'delivered',
        labelsField: 'date',
        format: (label, value) => `${label}: ${value.toLocaleString()} cartons`
      }),
      costPerCarton: chart({
        rows,
        seriesField: 'key',
        dataField: 'costPerCarton',
        labelsField: 'date',
        format: (label, value) => `${label}: $${value.toFixed(2)} per carton`
      }),
      laborCost: chart({
        rows,
        seriesField: 'key',
        dataField: 'laborCost',
        labelsField: 'date',
        format: (label, value) => `${label}: $${value.toFixed(2)} labor cost`
      })
    }
  }

  this.chart = chart
})