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from django.shortcuts import render
from django.http import HttpResponse

from collections import OrderedDict

# Include the `fusioncharts.py` file that contains functions to embed the charts.
from ..fusioncharts import FusionCharts

# Loading Data from a Ordered Dictionary
# Example to create a column 2D chart with the chart data passed as Dictionary format.
# The `chart` method is defined to load chart data from Dictionary.

def chart(request):

# Chart data is passed to the `dataSource` parameter, as dictionary in the form of key-value pairs.
    dataSource = OrderedDict()

# The `chartConfig` dict contains key-value pairs data for chart attribute
    chartConfig = OrderedDict()
    chartConfig["caption"] = "Countries With Most Oil Reserves [2017-18]"
    chartConfig["subCaption"] = "In MMbbl = One Million barrels"
    chartConfig["xAxisName"] = "Country"
    chartConfig["yAxisName"] = "Reserves (MMbbl)"
    chartConfig["numberSuffix"] = "K"
    chartConfig["theme"] = "fusion"

# The `chartData` dict contains key-value pairs data
    chartData = OrderedDict()
    chartData["Venezuela"] = 290
    chartData["Saudi"] = 260
    chartData["Canada"] = 180
    chartData["Iran"] = 140
    chartData["Russia"] = 115
    chartData["UAE"] = 100
    chartData["US"] = 30
    chartData["China"] = 30

dataSource["chart"] = chartConfig
    dataSource["data"] = []
    
    # Convert the data in the `chartData` array into a format that can be consumed by FusionCharts. 
    # The data for the chart should be in an array wherein each element of the array is a JSON object
    # having the `label` and `value` as keys.

# Iterate through the data in `chartData` and insert in to the `dataSource['data']` list.
    for key, value in chartData.items():
        data = {}
        data["label"] = key
        data["value"] = value
        dataSource["data"].append(data)

# Create an object for the column 2D chart using the FusionCharts class constructor
    # The chart data is passed to the `dataSource` parameter.
    column2D = FusionCharts("column2d", "ex1" , "600", "400", "chart-1", "json", dataSource)

return  render(request, 'index.html', {'output' : column2D.render(), 'chartTitle': 'Simple Chart Using Array'})