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feat(services): add PickedItemService
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| import {Location} from '@angular/common'; | ||
| import {Injectable} from '@angular/core'; | ||
| import {DefaultUrlSerializer, UrlTree} from '@angular/router'; | ||
| import {Subject} from 'rxjs'; | ||
|
|
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| import {Item} from '../build/item'; | ||
|
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| import {LolApiService} from './lolapi.service'; | ||
|
|
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| const availableChars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-'; | ||
|
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| @Injectable() | ||
| export class PickedItemsService { | ||
| items = new Subject<Array<Item>>(); | ||
| private originalItems = new Array<Item>(); | ||
| private itemIds = new Array<Item>(); | ||
| private serializer = new DefaultUrlSerializer(); | ||
|
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| constructor(lolapi: LolApiService, private location: Location) { | ||
| lolapi.getItems().subscribe((items) => { | ||
| this.originalItems = items.data; | ||
| let urlTree = this.getUrlTree(); | ||
| this.itemIds = this.decodeItems(urlTree.queryParams['q']); | ||
| this.update(); | ||
| }); | ||
| } | ||
|
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| add(item: Item) { | ||
| this.itemIds.push(item); | ||
| this.update(); | ||
| } | ||
|
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| remove(item: Item) { | ||
| let index = this.getItemIndex(item.id, item.time); | ||
| if (index !== undefined) { | ||
| this.itemIds.splice(index, 1); | ||
| this.update(); | ||
| } | ||
| } | ||
|
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||
| move(source: Item, target: Item) { | ||
| let indexSource = this.getItemIndex(source.id, source.time); | ||
| let indexTarget = this.getItemIndex(target.id, target.time); | ||
| if (indexSource && indexSource !== indexTarget) { | ||
| this.itemIds.splice(indexSource, 1); | ||
| this.itemIds.splice(indexSource < indexTarget ? indexTarget - 1 : indexTarget, 0, source); | ||
| } | ||
| } | ||
|
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||
| contains(container: Item, item: Item): boolean { | ||
| return container.contains.find((containedItem: Item) => { | ||
| return this.getItemIndex(containedItem.id, containedItem.time) === | ||
| this.getItemIndex(item.id, item.time); | ||
| }) !== undefined; | ||
| } | ||
|
|
||
| private update() { | ||
| this.updateQuery(this.itemIds); | ||
| this.items.next(this.itemIds); | ||
| } | ||
|
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| private updateQuery(items: Array<Item>) { | ||
| let urlTree = this.getUrlTree(); | ||
| urlTree.queryParams['q'] = this.encodeItems(items); | ||
| let url = this.serializer.serialize(urlTree); | ||
| this.location.replaceState(url); | ||
| } | ||
|
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| private getUrlTree(): UrlTree { | ||
| return this.serializer.parse(this.location.path(false)); | ||
| } | ||
|
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||
| private encodeItems(items: Array<Item>): string { | ||
| return this.encodeItemIds(this.itemsToIds(items)); | ||
| } | ||
|
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| private encodeItemIds(itemIds: Array<number>): string { | ||
| let encode = ''; | ||
| for (let id of itemIds) { | ||
| encode += this.encodeItem(id); | ||
| } | ||
| return encode; | ||
| } | ||
|
|
||
| private encodeItem(id: number): string { | ||
| let msbLocation = Math.floor(id / 64); | ||
| let msb = availableChars.at(msbLocation); | ||
| let lsbLocation = id - (msbLocation * 64); | ||
| let lsb = availableChars.at(lsbLocation); | ||
| return msb + lsb; | ||
| } | ||
|
|
||
| private decodeItems(query: string): Array<Item> { | ||
| return this.idsToItems(this.decodeItemIds(query)); | ||
| } | ||
|
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| private decodeItemIds(query: string): Array<number> { | ||
| let result = new Array<number>(); | ||
| if (!query) { | ||
| return result; | ||
| } | ||
| for (let i = 0; i < query.length / 2; i++) { | ||
| result.push(this.decodeItem(query.substr(i * 2, 2))); | ||
| } | ||
| return result; | ||
| } | ||
|
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||
| private decodeItem(query: string): number { | ||
| let msb = availableChars.indexOf(query.at(0)); | ||
| let lsb = availableChars.indexOf(query.at(1)); | ||
| return (msb * 64) + lsb; | ||
| } | ||
|
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| private itemsToIds(items: Array<Item>): Array<number> { | ||
| return items.map((item) => { | ||
| return parseInt(item.id, 10); | ||
| }); | ||
| } | ||
|
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| private idsToItems(itemIds: Array<number>): Array<Item> { | ||
| let result = new Array<Item>(); | ||
| for (let id of itemIds) { | ||
| let resultItem = this.originalItems[id]; | ||
| if (resultItem) { | ||
| result.push(resultItem); | ||
| } | ||
| } | ||
| return result; | ||
| } | ||
|
|
||
| private getItemIndex(id: string, time: number): number|undefined { | ||
| for (let index in this.itemIds) { | ||
| let item = this.itemIds[index]; | ||
| if (id === item.id && (time === item.time || time === -1)) { | ||
| return parseInt(index, 10); | ||
| } | ||
| } | ||
| } | ||
| } |