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import { SortMeta } from 'primeng/api'
import { HttpParams } from '@angular/common/http'
import { Injectable } from '@angular/core'
import { ComponentPaginationLight } from './component-pagination.model'
import { RestPagination } from './rest-pagination'
interface QueryStringFilterPrefixes {
[key: string]: {
prefix: string
handler?: (v: string) => string | number
multiple?: boolean
}
}
type ParseQueryStringFilterResult = {
[key: string]: string | number | (string | number)[]
}
@Injectable()
export class RestService {
addRestGetParams (params: HttpParams, pagination?: RestPagination, sort?: SortMeta | string) {
let newParams = params
if (pagination !== undefined) {
newParams = newParams.set('start', pagination.start.toString())
.set('count', pagination.count.toString())
}
if (sort !== undefined) {
let sortString = ''
if (typeof sort === 'string') {
sortString = sort
} else {
const sortPrefix = sort.order === 1 ? '' : '-'
sortString = sortPrefix + sort.field
}
newParams = newParams.set('sort', sortString)
}
return newParams
}
addObjectParams (params: HttpParams, object: { [ name: string ]: any }) {
for (const name of Object.keys(object)) {
const value = object[name]
if (!value) continue
if (Array.isArray(value) && value.length !== 0) {
for (const v of value) params = params.append(name, v)
} else {
params = params.append(name, value)
}
}
return params
}
componentPaginationToRestPagination (componentPagination: ComponentPaginationLight): RestPagination {
const start: number = (componentPagination.currentPage - 1) * componentPagination.itemsPerPage
const count: number = componentPagination.itemsPerPage
return { start, count }
}
parseQueryStringFilter (q: string, prefixes: QueryStringFilterPrefixes): ParseQueryStringFilterResult {
if (!q) return {}
// Tokenize the strings using spaces
const tokens = q.split(' ').filter(token => !!token)
// Build prefix array
const prefixeStrings = Object.values(prefixes)
.map(p => p.prefix)
// Search is the querystring minus defined filters
const searchTokens = tokens.filter(t => {
return prefixeStrings.every(prefixString => t.startsWith(prefixString) === false)
})
const additionalFilters: ParseQueryStringFilterResult = {}
for (const prefixKey of Object.keys(prefixes)) {
const prefixObj = prefixes[prefixKey]
const prefix = prefixObj.prefix
const matchedTokens = tokens.filter(t => t.startsWith(prefix))
.map(t => t.slice(prefix.length)) // Keep the value filter
.map(t => {
if (prefixObj.handler) return prefixObj.handler(t)
return t
})
.filter(t => !!t)
if (matchedTokens.length === 0) continue
additionalFilters[prefixKey] = prefixObj.multiple === true
? matchedTokens
: matchedTokens[0]
}
return {
search: searchTokens.join(' '),
...additionalFilters
}
}
}
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