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const { query } = require('winnow')
const helpers = require('../helpers')
function filterAndTransform (json, requestParams) {
const { features, type, ...restJson } = json
const params = FilterAndTransformParams.create(requestParams)
.removeParamsAlreadyApplied(json.filtersApplied)
.addToEsri()
.addInputCrs(json)
.normalizeObjectIds()
const result = query(json, params)
const { objectIds, outStatistics } = params
if (outStatistics) {
return {
statistics: result,
...restJson
}
}
if (!objectIds) {
return result
}
return {
...result,
features: filterByObjectIds(result, objectIds)
}
}
class FilterAndTransformParams {
static create (requestParams) {
return new FilterAndTransformParams(requestParams)
}
constructor (requestParams) {
Object.assign(this, requestParams)
}
removeParamsAlreadyApplied (alreadyApplied) {
for (const key in alreadyApplied) {
if (key === 'projection') {
delete this.outSR
}
if (key === 'offset') {
delete this.resultOffset
}
if (key === 'limit') {
delete this.resultRecordCount
}
delete this[key]
}
return this
}
addToEsri () {
this.toEsri = this.f !== 'geojson' && !this.returnExtentOnly
return this
}
addInputCrs (data = {}) {
const { metadata = {} } = data
this.inputCrs = this.inputCrs || this.sourceSR || metadata.crs || helpers.getCollectionCrs(data) || 4326
delete this.sourceSR
return this
}
normalizeObjectIds () {
if (!this.objectIds) {
return this
}
let ids
if (Array.isArray(this.objectIds)) {
ids = this.objectIds
} else if (typeof this.objectIds === 'string') {
ids = this.objectIds.split(',')
} else Eif (typeof this.objectIds === 'number') {
ids = [this.objectIds]
} else {
const error = new Error('Invalid "objectIds" parameter.')
error.code = 400
throw error
}
this.objectIds = ids.map(i => {
if (isNaN(i)) {
return i
}
return parseInt(i)
})
return this
}
}
function filterByObjectIds (data, objectIds) {
const idField = _.get(data, 'metadata.idField') || 'OBJECTID'
return data.features.filter(({ attributes = {}, properties = {} }) => {
return objectIds.includes(attributes[idField]) || objectIds.includes(properties[idField])
})
}
module.exports = { filterAndTransform }
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