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const Winnow = require('winnow');
const { getGeometryTypeFromGeojson } = require('../helpers');
const validateClassificationDefinition = require('./validate-classification-definition');
const { createColorRamp } = require('./color-ramp');
const { createSymbol } = require('./create-symbol');
module.exports = generateRenderer;
function generateRenderer(data = {}, options = {}) {
const { statistics = {}, features } = data;
const geometryType = getGeometryTypeFromGeojson(data);
const { classificationDef = {} } = options;
if (statistics.classBreaks) {
return generateRendererFromPrecalculatedStatistics(statistics, { classificationDef, geometryType })
}
if (features) {
return generateRendererFromFeatures(data, { ...options, geometryType });
}
return {};
}
function generateRendererFromPrecalculatedStatistics(statistics, options) {
const { classificationDef, geometryType = 'esriGeometryPoint' } = options
const { colorRamp: colorRampConfig = {}, baseSymbol } = classificationDef;
const breaks = statistics.classBreaks.sort((a, b) => a[0] - b[0]);
validateClassificationDefinition(classificationDef, geometryType, breaks);
const colorRamp = createColorRamp({ breaks, ...colorRampConfig });
const symbolCollection = colorRamp.map((color) => {
return createSymbol(baseSymbol, color, geometryType);
});
return renderClassBreaks(breaks, classificationDef, symbolCollection);
}
function generateRendererFromFeatures(data, params) {
const { classificationDef = {}, geometryType } = params;
// TODO: this seems weird; the winnow method is "query" but it's really a very specialized transform (aggregation)
// consider changes to winnow - this should maybe be a different method
const breaks = Winnow.query(data, params);
validateClassificationDefinition(classificationDef, geometryType, breaks);
const { colorRamp: colorRampConfig = {}, baseSymbol } = classificationDef;
const colorRamp = createColorRamp({ breaks, ...colorRampConfig });
const symbolCollection = colorRamp.map((color) => {
return createSymbol(baseSymbol, color, geometryType);
});
if (classificationDef.type === 'classBreaksDef') {
return renderClassBreaks(breaks, classificationDef, symbolCollection);
}
if (classificationDef.type === 'uniqueValueDef') {
return renderUniqueValue(breaks, classificationDef, symbolCollection);
}
throw new Error('invalid classification type: ', classificationDef.type);
}
function renderClassBreaks(breaks, classificationDef = {}, symbolCollection) {
return {
type: 'classBreaks',
field: classificationDef.classificationField || '',
classificationMethod: classificationDef.classificationMethod || '',
minValue: breaks[0][0],
classBreakInfos: createClassBreakInfos(breaks, symbolCollection),
};
}
function createClassBreakInfos(breaks, symbolCollection) {
return breaks.map((classBreak, index) => {
return {
classMinValue: classBreak[0],
classMaxValue: classBreak[1],
label: `${classBreak[0]}-${classBreak[1]}`,
description: '',
symbol: symbolCollection[index],
};
});
}
function renderUniqueValue(breaks, classificationDef, symbolCollection) {
const { uniqueValueFields, fieldDelimiter } = classificationDef;
return {
type: 'uniqueValue',
field1: uniqueValueFields[0],
field2: '',
field3: '',
fieldDelimiter,
defaultSymbol: {},
defaultLabel: '',
uniqueValueInfos: createUniqueValueInfos(
breaks,
fieldDelimiter,
symbolCollection
),
};
}
function createUniqueValueInfos(
uniqueValueEntries,
fieldDelimiter,
symbolCollection
) {
return uniqueValueEntries.map((uniqueValue, index) => {
const value = serializeUniqueValues(uniqueValue, fieldDelimiter);
return {
value,
count: uniqueValue.count,
label: value,
description: '',
symbol: symbolCollection[index],
};
});
}
function serializeUniqueValues(uniqueValue, delimiter) {
const thisBreak = _.cloneDeep(uniqueValue);
delete thisBreak.count;
const { count, ...rest } = uniqueValue;
return Object.values(rest).join(delimiter);
}
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