feat(app): update nginx image source

src/app/haxe/ru/m/puzzlez/source/NginxImageSource.hx

@@ -25,6 +25,7 @@ class NginxImageSource implements ImageSource {
   public var id(default, never):String = "nginx";
 
   private var baseUrl:String;
+  private var cache:Map<String, Promise<NginxResponse>> = new Map();
 
   public function new(baseUrl:String) {
     this.baseUrl = baseUrl;
@@ -36,8 +37,11 @@ class NginxImageSource implements ImageSource {
 
   public function getPage(page:Page):Promise<DataPage<ImageId>> {
     var category = page.filter.get("category");
-    return new JsonLoader<NginxResponse>().GET(category != null ? this.baseUrl + category + "/" : this.baseUrl)
+    var url = category != null ? this.baseUrl + category + "/" : this.baseUrl;
-      .then((response:NginxResponse) -> {
+    if (!this.cache.exists(url)) {
+      this.cache.set(url, new JsonLoader<NginxResponse>().GET(url));
+    }
+    return this.cache.get(url).then((response:NginxResponse) -> {
       var data:Array<ImageId> = [];
       for (item in response) {
         if (item.type == NginxResponseItemType.FILE) {
@@ -45,6 +49,7 @@ class NginxImageSource implements ImageSource {
           data.push(new ImageId().setSource(id).setId(itemId));
         }
       }
+      data = data.slice(page.index * page.count, (page.index + 1) * page.count);
       return {
         page: page,
         data: data,
@@ -55,12 +60,12 @@ class NginxImageSource implements ImageSource {
 
   public function load(id:String, thumb:Bool = false):Promise<ImageValue> {
     var url = this.baseUrl + StringTools.replace(id, "@", "/");
-    if (thumb) {
+    // TODO: default size by screen width?
+    var width = thumb ? 360 : 1920;
     var parts = url.split(".");
     var index = parts.length - 2;
-      parts[index] = parts[index] + "-thumbnail";
+    parts[index] = parts[index] + '-w${width}';
     url = parts.join(".");
-    }
     return Promise.promise(ImageValue.URL(url));
   }