{
  "$schema": "https://vega.github.io/schema/vega/v5.json",
  "background": "white",
  "padding": 5,
  "height": 200,
  "style": "cell",
  "data": [
    {
      "name": "source_0",
      "url": "data/seattle-weather.csv",
      "format": {"type": "csv", "parse": {"date": "date"}},
      "transform": [
        {
          "field": "date",
          "type": "timeunit",
          "units": ["month"],
          "as": ["month_date", "month_date_end"]
        },
        {
          "type": "aggregate",
          "groupby": ["month_date", "weather"],
          "ops": ["count"],
          "fields": [null],
          "as": ["__count"]
        },
        {
          "type": "stack",
          "groupby": ["month_date"],
          "field": "__count",
          "sort": {"field": ["weather"], "order": ["descending"]},
          "as": ["__count_start", "__count_end"],
          "offset": "zero"
        }
      ]
    }
  ],
  "signals": [
    {"name": "x_step", "value": 20},
    {
      "name": "width",
      "update": "bandspace(domain('x').length, 0.1, 0.05) * x_step"
    }
  ],
  "marks": [
    {
      "type": "group",
      "from": {
        "facet": {
          "data": "source_0",
          "name": "stack_group_main",
          "groupby": ["month_date", "month_date_end"],
          "aggregate": {
            "fields": [
              "__count_start",
              "__count_start",
              "__count_end",
              "__count_end"
            ],
            "ops": ["min", "max", "min", "max"]
          }
        }
      },
      "encode": {
        "update": {
          "x": {"scale": "x", "field": "month_date"},
          "width": {"scale": "x", "band": 1},
          "y": {
            "signal": "min(scale('y',datum[\"min___count_start\"]),scale('y',datum[\"max___count_start\"]),scale('y',datum[\"min___count_end\"]),scale('y',datum[\"max___count_end\"]))"
          },
          "y2": {
            "signal": "max(scale('y',datum[\"min___count_start\"]),scale('y',datum[\"max___count_start\"]),scale('y',datum[\"min___count_end\"]),scale('y',datum[\"max___count_end\"]))"
          },
          "clip": {"value": true},
          "cornerRadiusTopLeft": {"value": 3},
          "cornerRadiusTopRight": {"value": 3}
        }
      },
      "marks": [
        {
          "type": "group",
          "encode": {
            "update": {
              "y": {"field": {"group": "y"}, "mult": -1},
              "width": {"field": {"group": "width"}}
            }
          },
          "marks": [
            {
              "name": "marks",
              "type": "rect",
              "style": ["bar"],
              "from": {"data": "stack_group_main"},
              "encode": {
                "update": {
                  "fill": {"scale": "color", "field": "weather"},
                  "ariaRoleDescription": {"value": "bar"},
                  "description": {
                    "signal": "\"date (month): \" + (timeFormat(datum[\"month_date\"], timeUnitSpecifier([\"month\"], {\"year-month\":\"%b %Y \",\"year-month-date\":\"%b %d, %Y \"}))) + \"; Count of Records: \" + (format(datum[\"__count\"], \"\")) + \"; weather: \" + (isValid(datum[\"weather\"]) ? datum[\"weather\"] : \"\"+datum[\"weather\"])"
                  },
                  "width": {"field": {"group": "width"}},
                  "y": {"scale": "y", "field": "__count_end"},
                  "y2": {"scale": "y", "field": "__count_start"}
                }
              }
            }
          ]
        }
      ]
    }
  ],
  "scales": [
    {
      "name": "x",
      "type": "band",
      "domain": {"data": "source_0", "field": "month_date", "sort": true},
      "range": {"step": {"signal": "x_step"}},
      "paddingInner": 0.1,
      "paddingOuter": 0.05
    },
    {
      "name": "y",
      "type": "linear",
      "domain": {
        "data": "source_0",
        "fields": ["__count_start", "__count_end"]
      },
      "range": [{"signal": "height"}, 0],
      "nice": true,
      "zero": true
    },
    {
      "name": "color",
      "type": "ordinal",
      "domain": {"data": "source_0", "field": "weather", "sort": true},
      "range": "category"
    }
  ],
  "axes": [
    {
      "scale": "y",
      "orient": "left",
      "gridScale": "x",
      "grid": true,
      "tickCount": {"signal": "ceil(height/40)"},
      "domain": false,
      "labels": false,
      "aria": false,
      "maxExtent": 0,
      "minExtent": 0,
      "ticks": false,
      "zindex": 0
    },
    {
      "scale": "x",
      "orient": "bottom",
      "grid": false,
      "title": "date (month)",
      "format": {
        "signal": "timeUnitSpecifier([\"month\"], {\"year-month\":\"%b %Y \",\"year-month-date\":\"%b %d, %Y \"})"
      },
      "formatType": "time",
      "labelOverlap": true,
      "zindex": 0
    },
    {
      "scale": "y",
      "orient": "left",
      "grid": false,
      "title": "Count of Records",
      "labelOverlap": true,
      "tickCount": {"signal": "ceil(height/40)"},
      "zindex": 0
    }
  ],
  "legends": [{"fill": "color", "symbolType": "square", "title": "weather"}]
}