From e8ddafa388b75c742e6df55f34d796cefbf531ab Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pierre-=C3=89tienne=20Lord?=
 <7397743+pelord@users.noreply.github.com>
Date: Wed, 24 Apr 2019 12:23:41 -0400
Subject: [PATCH] feat(wms): Provide title to grouped layers (comma)

* feat(wms) Provide title to grouped layers (comma)

* refactor(layer-legend) based on reviews

* refactor(layer-legend) based on reviews

* refactor(layer-legend) code cleanup

* refactor(layer-legend) based on reviews

* refactor(layer-legend) based on reviews
---
 .../datasources/wms-datasource.interface.ts   |  9 ++++++++
 .../layer-legend/layer-legend.component.html  |  2 +-
 .../layer-legend/layer-legend.component.ts    | 21 ++++++++++++++++---
 3 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/packages/geo/src/lib/datasource/shared/datasources/wms-datasource.interface.ts b/packages/geo/src/lib/datasource/shared/datasources/wms-datasource.interface.ts
index 7f6678045d..0cbd6dd7d9 100644
--- a/packages/geo/src/lib/datasource/shared/datasources/wms-datasource.interface.ts
+++ b/packages/geo/src/lib/datasource/shared/datasources/wms-datasource.interface.ts
@@ -2,6 +2,7 @@ import olSourceImageWMS from 'ol/source/ImageWMS';
 
 import { DataSourceOptions } from './datasource.interface';
 import { WFSDataSourceOptionsParams } from './wfs-datasource.interface';
+import { MetadataOptions } from '../../../metadata/shared/metadata.interface';
 
 export interface WMSDataSourceOptions extends DataSourceOptions {
   // type?: 'wms';
@@ -16,6 +17,7 @@ export interface WMSDataSourceOptions extends DataSourceOptions {
   ratio?: number;
   ol?: olSourceImageWMS;
   refreshIntervalSec?: number;
+  _layerOptionsFromCapabilities?: WMSLayerOptionsFromCapabilities;
 }
 
 export interface WMSDataSourceOptionsParams {
@@ -23,3 +25,10 @@ export interface WMSDataSourceOptionsParams {
   version?: string;
   time?: string;
 }
+
+export interface WMSLayerOptionsFromCapabilities {
+  title?: string;
+  minResolution?: number;
+  maxResolution?: string;
+  metadata?: MetadataOptions;
+}
diff --git a/packages/geo/src/lib/layer/layer-legend/layer-legend.component.html b/packages/geo/src/lib/layer/layer-legend/layer-legend.component.html
index 6469098d6e..c609b54854 100644
--- a/packages/geo/src/lib/layer/layer-legend/layer-legend.component.html
+++ b/packages/geo/src/lib/layer/layer-legend/layer-legend.component.html
@@ -10,7 +10,7 @@
           [target]="legend"
           [collapsed]="false">
         </mat-icon>
-        <h4 matLine>{{item.title}}</h4>
+        <h4 matLine>{{computeItemTitle(item) | async}}</h4>
       </mat-list-item>
     
       <div #legend class="igo-layer-legend" [ngClass]="{'with-title': item.title}">
diff --git a/packages/geo/src/lib/layer/layer-legend/layer-legend.component.ts b/packages/geo/src/lib/layer/layer-legend/layer-legend.component.ts
index eb2c77f61b..9f925ff0e9 100644
--- a/packages/geo/src/lib/layer/layer-legend/layer-legend.component.ts
+++ b/packages/geo/src/lib/layer/layer-legend/layer-legend.component.ts
@@ -1,9 +1,11 @@
 import { Component, Input, OnInit, OnDestroy, ChangeDetectionStrategy } from '@angular/core';
 
-import { Subscription, BehaviorSubject } from 'rxjs';
+import { Subscription, BehaviorSubject, of, Observable } from 'rxjs';
 
 import { DataSourceLegendOptions } from '../../datasource/shared/datasources/datasource.interface';
 import { Layer } from '../shared/layers';
+import { CapabilitiesService } from '../../datasource/shared/capabilities.service';
+import { map } from 'rxjs/operators';
 
 @Component({
   selector: 'igo-layer-legend',
@@ -22,13 +24,12 @@ export class LayerLegendComponent implements OnInit, OnDestroy {
    * Subscription to the map's resolution
    */
   private resolution$$: Subscription;
-
   /**
    * Layer
    */
   @Input() layer: Layer;
 
-  constructor() {}
+  constructor(private capabilitiesService: CapabilitiesService) {}
 
   /**
    * On init, subscribe to the map's resolution and update the legend accordingly
@@ -60,4 +61,18 @@ export class LayerLegendComponent implements OnInit, OnDestroy {
     this.legendItems$.next(legendItems);
   }
 
+  computeItemTitle(layerLegend): Observable<string> {
+    const layerOptions = this.layer.dataSource.options as any;
+    if (layerOptions.type !== 'wms') {
+      return of(layerLegend.title);
+    }
+    const layers = layerOptions.params.layers.split(',');
+    const localLayerOptions = JSON.parse(JSON.stringify(layerOptions)); // to avoid to alter the original options.
+    localLayerOptions.params.layers = layers.find(layer => layer === layerLegend.title);
+    return this.capabilitiesService
+      .getWMSOptions(localLayerOptions)
+      .pipe(map(wmsDataSourceOptions => {
+        return wmsDataSourceOptions._layerOptionsFromCapabilities.title;
+      }));
+  }
 }