Value.NONE not nullable + offset change

src/main/angular/public/favicon.svg

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="iso-8859-1"?>
+<!--suppress HtmlDeprecatedAttribute -->
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512">
+  <circle fill="#4a97b8" cx="256" cy="256" r="256"/>
+  <path fill="#57b153" d="M412,280l-60-64l-60,127.252L172,280L52,400v10.62C98.752,472.204,172.72,512,256,512c141.384,0,256-114.616,256-256c0-44.752-11.512-86.8-31.696-123.404L412,280z"/>
+  <g stroke="black" stroke-width="10px">
+    <path d="M52,408c-2.048,0-4.092-0.78-5.656-2.344c-3.124-3.124-3.124-8.188,0-11.312l120-120c2.48-2.48,6.28-3.064,9.388-1.42l112.6,59.36l56.432-119.688c1.124-2.4,3.368-4.08,5.984-4.492c2.624-0.424,5.268,0.496,7.084,2.428l51.892,55.356L480.74,112.64c1.86-4.012,6.612-5.748,10.62-3.896c4.008,1.856,5.752,6.612,3.896,10.62l-76,164c-1.116,2.416-3.36,4.112-5.984,4.54c-2.616,0.408-5.288-0.492-7.104-2.424l-51.948-55.424L299.24,346.66c-0.924,1.976-2.628,3.484-4.7,4.176c-2.064,0.696-4.332,0.508-6.264-0.508l-114.78-60.504L57.664,405.652C56.096,407.22,54.048,408,52,408z"/>
+  </g>
+  <g fill="#F5F5F5">
+    <path d="M172,264c8.84,0,16,7.16,16,16s-7.16,16-16,16s-16-7.16-16-16S163.16,264,172,264 M172,256c-13.236,0-24,10.764-24,24s10.764,24,24,24s24-10.764,24-24S185.236,256,172,256L172,256z"/>
+    <path d="M46.964,388c8.84,0,16,7.16,16,16s-7.16,16-16,16s-16-7.16-16-16S38.124,388,46.964,388 M46.964,380c-13.236,0-24,10.764-24,24s10.764,24,24,24s24-10.764,24-24S60.2,380,46.964,380L46.964,380z"/>
+    <path d="M486.96,100c8.844,0,16,7.16,16,16s-7.156,16-16,16c-8.836,0-16-7.16-16-16S478.124,100,486.96,100M486.96,92c-13.236,0-24,10.764-24,24s10.764,24,24,24c13.24,0,24-10.764,24-24S500.2,92,486.96,92L486.96,92z"/>
+    <path d="M352,200c8.84,0,16,7.16,16,16s-7.16,16-16,16s-16-7.16-16-16S343.16,200,352,200 M352,192c-13.236,0-24,10.764-24,24s10.764,24,24,24s24-10.764,24-24S365.236,192,352,192L352,192z"/>
+  </g>
+  <g fill="black">
+    <circle cx="172" cy="280" r="16"/>
+    <circle cx="46.964" cy="404" r="16"/>
+    <circle cx="486.96" cy="116" r="16"/>
+    <circle cx="352" cy="216" r="16"/>
+  </g>
+</svg>

src/main/angular/src/app/location/detail/history/series-history.html

@@ -2,6 +2,7 @@
   <div class="SectionHeading">
     <div class="SectionHeadingText">
       {{ heading }}
+      <ng-content #SeriesHistoryHeading></ng-content>
     </div>
   </div>
   <div class="SectionBody">
@@ -11,7 +12,7 @@
         Bezug
       </div>
       <div class="SectionBody purchase">
-        {{ purchase?.toValueString(true, interval ? null : now) }}
+        {{ purchase.toValueString(true, interval ? null : now) }}
       </div>
     </div>
 
@@ -20,7 +21,7 @@
         Solar
       </div>
       <div class="SectionBody produce">
-        {{ produce?.toValueString(true, interval ? null : now) }}
+        {{ produce.toValueString(true, interval ? null : now) }}
       </div>
     </div>
 
@@ -29,7 +30,7 @@
         Verbrauch
       </div>
       <div class="SectionBody consume">
-        {{ consume?.toValueString(true, interval ? null : now) }}
+        {{ consume.toValueString(true, interval ? null : now) }}
       </div>
     </div>
 
@@ -38,7 +39,7 @@
         Einspeisung
       </div>
       <div class="SectionBody deliver">
-        {{ deliver?.toValueString(true, interval ? null : now) }}
+        {{ deliver.toValueString(true, interval ? null : now) }}
       </div>
     </div>
 

src/main/angular/src/app/location/detail/history/series-history.ts

@@ -20,19 +20,28 @@ export class SeriesHistory implements OnInit, AfterViewInit, OnDestroy {
 
   private readonly subs: Subscription[] = [];
 
-  protected purchase: Value | null = null;
+  protected purchase: Value = Value.NONE;
 
-  protected deliver: Value | null = null;
+  protected deliver: Value = Value.NONE;
 
-  protected produce: Value | null = null;
+  protected produce: Value = Value.NONE;
 
-  protected consume: Value | null = null;
+  protected consume: Value = Value.NONE;
 
   @Input()
-  heading!: string;
+  heading: string = "";
+
+  private _o_: number = 0;
 
   @Input()
-  offset: number = 0;
+  set offset(value: number) {
+    this._o_ = value;
+    this.ngAfterViewInit();
+  }
+
+  get offset(): number {
+    return this._o_;
+  }
 
   @Input()
   interval: Interval | null = null;
@@ -85,11 +94,11 @@ export class SeriesHistory implements OnInit, AfterViewInit, OnDestroy {
     }
   };
 
-  private history(fresh: Series | null | undefined, series: Series | null | undefined, next: Next<Value | null>) {
-    const n = (value: Value | null) => {
+  private history(fresh: Series | null | undefined, series: Series | null | undefined, next: Next<Value>): void {
+    const callNextAndUpdateConsume = (value: Value) => {
       next(value);
-      this.consume = this.purchase?.plus(this.produce)?.minus(this.deliver) || null;
-    }
+      this.consume = this.purchase.plus(this.produce).minus(this.deliver);
+    };
     if (fresh !== null && fresh !== undefined) {
       if (fresh.id !== series?.id) {
         return;
@@ -97,18 +106,14 @@ export class SeriesHistory implements OnInit, AfterViewInit, OnDestroy {
       series = fresh;
     }
     if (!series) {
-      n(null);
+      callNextAndUpdateConsume(Value.NONE);
       return
     }
     if (this.interval) {
-      this.pointService.relative([series], this.interval, this.offset, 1, response => n(Value.ofPoint(response, 0, 0, 1)));
+      this.pointService.relative([series], this.interval, this.offset, 1, response => callNextAndUpdateConsume(Value.ofPoint(response, 0, 0, 1)));
     } else {
-      n(series.value);
+      callNextAndUpdateConsume(series.value);
     }
   }
 
-  protected nullOrZero(value: Value | null | undefined): boolean {
-    return value === null || value === undefined || value.value === 0;
-  }
-
 }

src/main/angular/src/app/location/detail/location-detail.html

@@ -4,7 +4,18 @@
 
   <app-series-history [now]="now" [location]="location" [interval]="Interval.DAY" heading="Heute"></app-series-history>
 
-  <app-series-history [now]="now" [location]="location" [interval]="Interval.DAY" [offset]="1" heading="Gestern"></app-series-history>
+  <app-series-history [now]="now" [location]="location" [interval]="Interval.DAY" [offset]="offset">
+    <ng-content #SeriesHistoryHeading>
+      <div style="display: flex; width: 100%">
+        &nbsp;
+        <div (click)="offset += 1">&larr;</div>
+        &nbsp;
+        <div (click)="offset = Math.max(1, offset -1)">&rarr;</div>
+        &nbsp;
+        <div style="flex: 1">{{ offsetDayTitle() }}</div>
+      </div>
+    </ng-content>
+  </app-series-history>
 
   <div class="Section">
     <div class="SectionHeading">

src/main/angular/src/app/location/detail/location-detail.ts

@@ -1,4 +1,4 @@
-import {Component, OnDestroy, OnInit} from '@angular/core';
+import {Component, Inject, LOCALE_ID, OnDestroy, OnInit} from '@angular/core';
 import {LocationService} from '../location-service';
 import {ActivatedRoute} from '@angular/router';
 import {Location} from '../Location';
@@ -12,6 +12,7 @@ import {Subscription, timer} from 'rxjs';
 import {SeriesHistory} from './history/series-history';
 import {Interval} from '../../series/Interval';
 import {MenuService} from '../../menu-service';
+import {DatePipe} from '@angular/common';
 
 function yesterday(now: any) {
   const yesterday = new Date(now.getTime());
@@ -34,6 +35,8 @@ export class LocationDetail implements OnInit, OnDestroy {
 
   protected readonly Interval = Interval;
 
+  protected readonly Math = Math;
+
   protected location: Location | null = null;
 
   private readonly subs: Subscription [] = [];
@@ -44,13 +47,18 @@ export class LocationDetail implements OnInit, OnDestroy {
 
   protected yesterday: Date = yesterday(this.now);
 
+  protected offset: number = 1;
+
+  private readonly datePipe: DatePipe;
+
   constructor(
     readonly locationService: LocationService,
     readonly seriesService: SeriesService,
     readonly activatedRoute: ActivatedRoute,
     readonly menuService: MenuService,
+    @Inject(LOCALE_ID) readonly locale: string,
   ) {
-    //
+    this.datePipe = new DatePipe(locale);
   }
 
   ngOnInit(): void {
@@ -96,4 +104,19 @@ export class LocationDetail implements OnInit, OnDestroy {
     return this.series.filter(series => series.type === SeriesType.VARYING && series.unit === 'W');
   };
 
+  protected offsetDayTitle(): string {
+    if (this.offset === 1) {
+      return 'Gestern';
+    } else if (this.offset === 2) {
+      return 'Vorgestern';
+    } else {
+      if (this.offset < 7) {
+        const d = new Date(this.now);
+        d.setDate(d.getDate() - this.offset);
+        return this.datePipe.transform(d, 'EEEE') || '';
+      }
+      return `Vor ${this.offset} Tagen`;
+    }
+  }
+
 }

src/main/angular/src/app/series/Series.ts

@@ -5,7 +5,7 @@ import {Value} from './Value';
 
 export class Series {
 
-  readonly value: Value | null = null;
+  readonly value: Value;
 
   constructor(
     readonly id: number,

src/main/angular/src/app/series/Value.ts

@@ -4,8 +4,10 @@ import {Series} from './Series';
 
 export class Value {
 
-  constructor(
-    readonly value: number,
+  static readonly NONE: Value = new Value(null, 0, 0, "", new Date());
+
+  private constructor(
+    readonly value: number | null,
     readonly precision: number,
     readonly seconds: number,
     readonly unit: string,
@@ -15,8 +17,8 @@ export class Value {
   }
 
   toValueString(zeroToDash: boolean, now_ageCheckToDash: Date | null): string {
-    if (this.value === null || this.value === undefined) {
-      return "[???]";
+    if (this.value === null) {
+      return "-";
     }
     if (this.value === 0) {
       return zeroToDash ? "-" : `0 ${this.unit}`;
@@ -39,20 +41,20 @@ export class Value {
     return formatNumber(this.value, "de-DE", `0.${-rest}-${-rest}`) + ' ' + this.unit;
   }
 
-  plus(other: Value | null | undefined): Value | null {
+  plus(other: Value): Value {
     return this.operateSameUnit("plus", other, (a, b) => a + b);
   }
 
-  minus(other: Value | null | undefined): Value | null {
+  minus(other: Value): Value {
     return this.operateSameUnit("minus", other, (a, b) => a - b);
   }
 
-  operateSameUnit(operationName: string, other: Value | null | undefined, operation: (a: number, b: number) => number): Value | null {
-    if (!other) {
-      return null;
+  operateSameUnit(name: string, other: Value, operation: (a: number, b: number) => number): Value {
+    if (this.value === null || other.value === null) {
+      return Value.NONE;
     }
     if (this.unit !== other.unit) {
-      throw new Error(`Operation '${operationName} needs units to be the same: this=${this}, other=${other}`);
+      throw new Error(`Operation '${name} needs units to be the same: this=${this}, other=${other}`);
     }
     const decimals = Math.max(this.precision, other.precision);
     const seconds = Math.max(this.seconds, other.seconds);
@@ -60,25 +62,27 @@ export class Value {
     return new Value(operation(this.value, other.value), decimals, seconds, this.unit, date);
   }
 
-  static of(series: Series, value: number | null | undefined, date: Date | null | undefined): Value | null {
-    if (value === null || value === undefined) {
-      return null;
+  static of(series: Series, value: number | null | undefined, date: Date | null | undefined): Value {
+    value = value === undefined ? null : value;
+    date = date === undefined ? null : date;
+    if (value === null) {
+      return this.NONE;
     }
-    if (date === null || date === undefined) {
+    if (date === null) {
       throw new Error("When 'value' is set, 'last' must be set too, but isn't!")
     }
     return new Value(value, series.precision, series.seconds, series.unit, date);
   }
 
-  static ofPoint(response: PointResponse, seriesIndex: number, pointIndex: number, valueIndex: number): Value | null {
+  static ofPoint(response: PointResponse, seriesIndex: number, pointIndex: number, valueIndex: number): Value {
     const series = response.series[seriesIndex];
     if (!series) {
-      return null;
+      return this.NONE;
     }
 
     const point = series.points[pointIndex];
     if (!point) {
-      return null;
+      return this.NONE;
     }
 
     const date = new Date(point[0] * 1000);

src/main/angular/src/app/series/select/series-select.html

@@ -8,7 +8,7 @@
     <option [ngValue]="null">-</option>
     @for (series of series; track series.id) {
       <option [ngValue]="series.id">
-        {{ series.name }}: {{ series.value?.toValueString(false, now) }}
+        {{ series.name }}: {{ series.value.toValueString(false, now) }}
       </option>
     }
   </select>

src/main/angular/src/index.html

@@ -2,11 +2,11 @@
 <html lang="de">
 <head>
   <meta charset="utf-8">
-  <title>Angular</title>
+  <title>Data2025</title>
   <base href="/">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <!--suppress HtmlUnknownTarget -->
-  <link rel="icon" type="image/x-icon" href="favicon.ico">
+  <link rel="icon" type="image/svg" href="favicon.svg">
 </head>
 <body>
 <app-root></app-root>

src/main/angular/src/styles.less

@@ -4,6 +4,7 @@ body {
   margin: 0;
   font-family: sans-serif;
   font-size: 4vw;
+  user-select: none;
 }
 
 div {
@@ -46,6 +47,7 @@ div {
 
   > .SectionHeading {
     color: dimgray;
+
     > .SectionHeadingText {
       font-size: 70%;
       font-style: italic;