feat: made two inputs work correctly

.gitignore

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+# See http://help.github.com/ignore-files/ for more about ignoring files.
+
+# Compiled output
+/dist
+/tmp
+/out-tsc
+/bazel-out
+
+# Node
+/node_modules
+npm-debug.log
+yarn-error.log
+
+# IDEs and editors
+.idea/
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# Visual Studio Code
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+.history/*
+
+# Miscellaneous
+/.angular/cache
+.sass-cache/
+/connect.lock
+/coverage
+/libpeerconnection.log
+testem.log
+/typings
+
+# System files
+.DS_Store
+Thumbs.db

TS/two-inputs/.editorconfig

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+# Editor configuration, see https://editorconfig.org
+root = true
+
+[*]
+charset = utf-8
+indent_style = space
+indent_size = 2
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.ts]
+quote_type = single
+
+[*.md]
+max_line_length = off
+trim_trailing_whitespace = false

TS/two-inputs/.gitignore

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+# See http://help.github.com/ignore-files/ for more about ignoring files.
+
+# Compiled output
+/dist
+/tmp
+/out-tsc
+/bazel-out
+
+# Node
+/node_modules
+npm-debug.log
+yarn-error.log
+
+# IDEs and editors
+.idea/
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# Visual Studio Code
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+.history/*
+
+# Miscellaneous
+/.angular/cache
+.sass-cache/
+/connect.lock
+/coverage
+/libpeerconnection.log
+testem.log
+/typings
+
+# System files
+.DS_Store
+Thumbs.db

TS/two-inputs/.vscode/extensions.json

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+{
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=827846
+  "recommendations": ["angular.ng-template"]
+}

TS/two-inputs/.vscode/launch.json

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+{
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "ng serve",
+      "type": "chrome",
+      "request": "launch",
+      "preLaunchTask": "npm: start",
+      "url": "http://localhost:4200/"
+    },
+    {
+      "name": "ng test",
+      "type": "chrome",
+      "request": "launch",
+      "preLaunchTask": "npm: test",
+      "url": "http://localhost:9876/debug.html"
+    }
+  ]
+}

TS/two-inputs/.vscode/tasks.json

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+{
+  // For more information, visit: https://go.microsoft.com/fwlink/?LinkId=733558
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "type": "npm",
+      "script": "start",
+      "isBackground": true,
+      "problemMatcher": {
+        "owner": "typescript",
+        "pattern": "$tsc",
+        "background": {
+          "activeOnStart": true,
+          "beginsPattern": {
+            "regexp": "(.*?)"
+          },
+          "endsPattern": {
+            "regexp": "bundle generation complete"
+          }
+        }
+      }
+    },
+    {
+      "type": "npm",
+      "script": "test",
+      "isBackground": true,
+      "problemMatcher": {
+        "owner": "typescript",
+        "pattern": "$tsc",
+        "background": {
+          "activeOnStart": true,
+          "beginsPattern": {
+            "regexp": "(.*?)"
+          },
+          "endsPattern": {
+            "regexp": "bundle generation complete"
+          }
+        }
+      }
+    }
+  ]
+}

TS/two-inputs/README.md

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+# TwoInputs
+
+This project was generated with [Angular CLI](https://github.com/angular/angular-cli) version 17.0.3.
+
+## Development server
+
+Run `ng serve` for a dev server. Navigate to `http://localhost:4200/`. The application will automatically reload if you change any of the source files.
+
+## Code scaffolding
+
+Run `ng generate component component-name` to generate a new component. You can also use `ng generate directive|pipe|service|class|guard|interface|enum|module`.
+
+## Build
+
+Run `ng build` to build the project. The build artifacts will be stored in the `dist/` directory.
+
+## Running unit tests
+
+Run `ng test` to execute the unit tests via [Karma](https://karma-runner.github.io).
+
+## Running end-to-end tests
+
+Run `ng e2e` to execute the end-to-end tests via a platform of your choice. To use this command, you need to first add a package that implements end-to-end testing capabilities.
+
+## Further help
+
+To get more help on the Angular CLI use `ng help` or go check out the [Angular CLI Overview and Command Reference](https://angular.io/cli) page.

TS/two-inputs/angular.json

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+{
+  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
+  "version": 1,
+  "newProjectRoot": "projects",
+  "projects": {
+    "two-inputs": {
+      "projectType": "application",
+      "schematics": {
+        "@schematics/angular:component": {
+          "style": "scss"
+        }
+      },
+      "root": "",
+      "sourceRoot": "src",
+      "prefix": "app",
+      "architect": {
+        "build": {
+          "builder": "@angular-devkit/build-angular:application",
+          "options": {
+            "outputPath": "dist/two-inputs",
+            "index": "src/index.html",
+            "browser": "src/main.ts",
+            "polyfills": [
+              "zone.js"
+            ],
+            "tsConfig": "tsconfig.app.json",
+            "inlineStyleLanguage": "scss",
+            "assets": [
+              "src/favicon.ico",
+              "src/assets"
+            ],
+            "styles": [
+              "@angular/material/prebuilt-themes/indigo-pink.css",
+              "src/styles.scss"
+            ],
+            "scripts": []
+          },
+          "configurations": {
+            "production": {
+              "budgets": [
+                {
+                  "type": "initial",
+                  "maximumWarning": "500kb",
+                  "maximumError": "1mb"
+                },
+                {
+                  "type": "anyComponentStyle",
+                  "maximumWarning": "2kb",
+                  "maximumError": "4kb"
+                }
+              ],
+              "outputHashing": "all"
+            },
+            "development": {
+              "optimization": false,
+              "extractLicenses": false,
+              "sourceMap": true
+            }
+          },
+          "defaultConfiguration": "production"
+        },
+        "serve": {
+          "builder": "@angular-devkit/build-angular:dev-server",
+          "configurations": {
+            "production": {
+              "buildTarget": "two-inputs:build:production"
+            },
+            "development": {
+              "buildTarget": "two-inputs:build:development"
+            }
+          },
+          "defaultConfiguration": "development"
+        },
+        "extract-i18n": {
+          "builder": "@angular-devkit/build-angular:extract-i18n",
+          "options": {
+            "buildTarget": "two-inputs:build"
+          }
+        },
+        "test": {
+          "builder": "@angular-devkit/build-angular:karma",
+          "options": {
+            "polyfills": [
+              "zone.js",
+              "zone.js/testing"
+            ],
+            "tsConfig": "tsconfig.spec.json",
+            "inlineStyleLanguage": "scss",
+            "assets": [
+              "src/favicon.ico",
+              "src/assets"
+            ],
+            "styles": [
+              "@angular/material/prebuilt-themes/indigo-pink.css",
+              "src/styles.scss"
+            ],
+            "scripts": []
+          }
+        }
+      }
+    }
+  }
+}

TS/two-inputs/package.json

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+{
+  "name": "two-inputs",
+  "version": "0.0.0",
+  "scripts": {
+    "ng": "ng",
+    "start": "ng serve",
+    "build": "ng build",
+    "watch": "ng build --watch --configuration development",
+    "test": "ng test"
+  },
+  "private": true,
+  "dependencies": {
+    "@angular/animations": "^17.0.0",
+    "@angular/cdk": "^17.3.5",
+    "@angular/common": "^17.0.0",
+    "@angular/compiler": "^17.0.0",
+    "@angular/core": "^17.0.0",
+    "@angular/forms": "^17.0.0",
+    "@angular/material": "^17.3.5",
+    "@angular/platform-browser": "^17.0.0",
+    "@angular/platform-browser-dynamic": "^17.0.0",
+    "@angular/router": "^17.0.0",
+    "rxjs": "~7.8.0",
+    "tslib": "^2.3.0",
+    "zone.js": "~0.14.2"
+  },
+  "devDependencies": {
+    "@angular-devkit/build-angular": "^17.0.3",
+    "@angular/cli": "^17.0.3",
+    "@angular/compiler-cli": "^17.0.0",
+    "@types/jasmine": "~5.1.0",
+    "jasmine-core": "~5.1.0",
+    "karma": "~6.4.0",
+    "karma-chrome-launcher": "~3.2.0",
+    "karma-coverage": "~2.2.0",
+    "karma-jasmine": "~5.1.0",
+    "karma-jasmine-html-reporter": "~2.1.0",
+    "typescript": "~5.2.2"
+  }
+}

TS/two-inputs/src/app/app.component.html

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+<mat-form-field class="example-form-field">
+  <mat-label>min</mat-label>
+  <input matInput type="number" [(ngModel)]="min" (input)="updateInput()">
+</mat-form-field>
+<mat-form-field class="example-form-field">
+  <mat-label>max</mat-label>
+  <input matInput type="number" [(ngModel)]="max" (input)="updateInput()">
+</mat-form-field>
+<mat-form-field class="example-form-field">
+  <mat-label>step</mat-label>
+  <input matInput type="number" [(ngModel)]="step" (input)="updateInput()">
+</mat-form-field>
+<mat-form-field class="example-form-field">
+  <mat-label>targetValue</mat-label>
+  <input matInput type="number" [(ngModel)]="targetValue" (input)="updateInput()">
+</mat-form-field> <br>
+<mat-form-field class="example-form-field">
+  <mat-label>inputOne</mat-label>
+  <input disabled="true" matInput type="number" [min]="min" [step]="step" [max]="max" [(ngModel)]="inputOne">
+</mat-form-field> 
+<button mat-button (click)="upOne()"> UP </button> 
+<button mat-button (click)="downOne()"> DOWN </button> 
+<br>
+<mat-form-field class="example-form-field">
+  <mat-label>inputTwo</mat-label>
+  <input disabled="true" matInput type="number" [min]="min" [step]="step" [max]="max" [(ngModel)]="inputTwo">
+</mat-form-field>
+<button mat-button (click)="upTwo()"> UP </button> 
+<button mat-button (click)="downTwo()"> DOWN </button> 
+<br>

TS/two-inputs/src/app/app.component.spec.ts

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+import { TestBed } from '@angular/core/testing';
+import { AppComponent } from './app.component';
+
+describe('AppComponent', () => {
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      imports: [AppComponent],
+    }).compileComponents();
+  });
+
+  it('should create the app', () => {
+    const fixture = TestBed.createComponent(AppComponent);
+    const app = fixture.componentInstance;
+    expect(app).toBeTruthy();
+  });
+
+  it(`should have the 'two-inputs' title`, () => {
+    const fixture = TestBed.createComponent(AppComponent);
+    const app = fixture.componentInstance;
+    expect(app.title).toEqual('two-inputs');
+  });
+
+  it('should render title', () => {
+    const fixture = TestBed.createComponent(AppComponent);
+    fixture.detectChanges();
+    const compiled = fixture.nativeElement as HTMLElement;
+    expect(compiled.querySelector('h1')?.textContent).toContain('Hello, two-inputs');
+  });
+});

TS/two-inputs/src/app/app.component.ts

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+import { Component } from '@angular/core';
+import { CommonModule } from '@angular/common';
+import { RouterOutlet } from '@angular/router';
+import { MatInputModule } from '@angular/material/input';
+import {MatButtonModule} from '@angular/material/button';
+import { FormsModule } from '@angular/forms';
+
+@Component({
+  selector: 'app-root',
+  standalone: true,
+  imports: [CommonModule, RouterOutlet, MatInputModule, FormsModule, MatButtonModule],
+  templateUrl: './app.component.html',
+  styleUrls: ['./app.component.scss']
+})
+export class AppComponent {
+  inputOne: number | null = null;  // Default initialization to 50
+  inputTwo: number | null = null;  // Default initialization to 50
+  min: number | null = 100;
+  max: number | null = 250;
+  step: number | null = 25;
+  targetValue: number | null = 325;
+  indexOne: number = 0;
+  indexTwo: number = 0;
+  possibleValues: Array<[number, number]> | null = [];
+
+  constructor() {
+    this.possibleValues = AppComponent.findValidPairs(this.step, this.min, this.max, this.targetValue);
+  }
+
+  ngOnInit() {
+    this.possibleValues = AppComponent.findValidPairs(this.step, this.min, this.max, this.targetValue);
+  }
+
+  public updateInput() {
+    this.possibleValues = AppComponent.findValidPairs(this.step, this.min, this.max, this.targetValue);
+  }
+
+  private changeIndex(currentValue: number, direction: boolean) {
+    this.possibleValues = AppComponent.findValidPairs(this.step, this.min, this.max, this.targetValue);
+    const length = this.possibleValues?.length;
+    if(typeof length !== "undefined") {
+    if(direction) {
+      if(currentValue + 1 > length - 1) {
+        return 0;
+      }
+      return currentValue + 1;
+    } else {
+      if(currentValue - 1 < 0) {
+        return length - 1;
+      }
+      return currentValue - 1;
+    }
+    } else {
+      console.error(`appComponent, changeIndex, length is undefined!`, length);
+    }
+    return currentValue;
+  }
+
+  updateTwoValue() {
+    if(this.possibleValues !== null) {
+      this.inputOne = this.possibleValues[this.indexOne][0];
+      if(typeof this.inputOne !== "undefined" && this.inputOne !== null) {
+      const result = AppComponent.findCorrespondingValue(this.possibleValues, this.inputOne);
+      if(result !== null) {
+        [this.inputTwo, this.indexTwo] = result;
+        return; 
+      }
+      console.error(`result is null!`);
+    } 
+      console.error(`this.inputOne is null or undefined!: `, this.inputOne, this.possibleValues, this.indexOne);
+    }
+  }
+
+  upOne() {
+    this.indexOne = this.changeIndex(this.indexOne, true);
+    this.updateTwoValue();
+  }
+
+  downOne() {
+    this.indexOne = this.changeIndex(this.indexOne, false);
+    this.updateTwoValue();
+  }
+
+  upTwo() {
+    this.indexTwo = this.changeIndex(this.indexTwo, true);
+    if(this.possibleValues !== null) {
+      this.inputTwo = this.possibleValues[this.indexTwo][1];
+      const result = AppComponent.findCorrespondingValue(this.possibleValues, this.inputTwo);
+      if(result !== null) {
+        [this.inputOne, this.indexOne] = result;
+      }
+    }
+  }
+
+  downTwo() {
+    this.indexTwo = this.changeIndex(this.indexTwo, false);
+    if(this.possibleValues !== null) {
+      this.inputTwo = this.possibleValues[this.indexTwo][1];
+      const result = AppComponent.findCorrespondingValue(this.possibleValues, this.inputTwo);
+      if(result !== null) {
+        [this.inputOne, this.indexOne] = result;
+      }
+    }
+  }
+
+  private static findCorrespondingValue(pairs: Array<[number, number]>, number: number): [number, number] | null {
+    for (let index = 0; index < pairs.length; index += 1) {
+        if (pairs[index][0] === number) {
+            return [pairs[index][1], index]; // Return n2 if the given number matches n1
+        } else if (pairs[index][1] === number) {
+            return [pairs[index][0], index]; // Return n1 if the given number matches n2
+        }
+    }
+    console.error("No corresponding value found for the provided number in the pairs.", pairs, number);
+    return null; // Return null if no matching number is found
+}
+
+  private static findValidPairs(x: number | null, y: number | null, z: number | null, ml: number | null): Array<[number, number]> | null {
+    if (x === null || y === null || z === null || ml === null) {
+        console.error("findValidPairs, some value is null");
+        return null;
+    }
+
+    const results: Array<[number, number]> = [];
+
+    // Iterate through possible values of n1, which must be multiples of x, at least y, and not more than z
+    for (let n1 = y; n1 <= ml - y && n1 <= z; n1 += x) {
+        let n2 = ml - n1;
+        // Ensure n2 is also a multiple of x, n2 >= y, and n2 <= z
+        if (n2 % x === 0 && n2 >= y && n2 <= z) {
+            results.push([n1, n2]);
+        }
+    }
+
+    return results;
+}
+
+}

TS/two-inputs/src/app/app.config.ts

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+import { ApplicationConfig } from '@angular/core';
+import { provideRouter } from '@angular/router';
+
+import { routes } from './app.routes';
+import { provideAnimationsAsync } from '@angular/platform-browser/animations/async';
+
+export const appConfig: ApplicationConfig = {
+  providers: [provideRouter(routes), provideAnimationsAsync(), provideAnimationsAsync()]
+};

TS/two-inputs/src/app/app.routes.ts

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+import { Routes } from '@angular/router';
+
+export const routes: Routes = [];

TS/two-inputs/src/index.html

@@ -0,0 +1,15 @@
+<!doctype html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <title>TwoInputs</title>
+  <base href="/">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <link rel="icon" type="image/x-icon" href="favicon.ico">
+  <link href="https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500&display=swap" rel="stylesheet">
+  <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
+</head>
+<body class="mat-typography">
+  <app-root></app-root>
+</body>
+</html>

TS/two-inputs/src/main.ts

@@ -0,0 +1,6 @@
+import { bootstrapApplication } from '@angular/platform-browser';
+import { appConfig } from './app/app.config';
+import { AppComponent } from './app/app.component';
+
+bootstrapApplication(AppComponent, appConfig)
+  .catch((err) => console.error(err));

TS/two-inputs/src/styles.scss

@@ -0,0 +1,6 @@
+/* You can add global styles to this file, and also import other style files */
+@use '@angular/material' as mat;
+
+@include mat.core();
+html, body { height: 100%; }
+body { margin: 0; font-family: Roboto, "Helvetica Neue", sans-serif; }

TS/two-inputs/tsconfig.app.json

@@ -0,0 +1,14 @@
+/* To learn more about this file see: https://angular.io/config/tsconfig. */
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./out-tsc/app",
+    "types": []
+  },
+  "files": [
+    "src/main.ts"
+  ],
+  "include": [
+    "src/**/*.d.ts"
+  ]
+}

TS/two-inputs/tsconfig.json

@@ -0,0 +1,32 @@
+/* To learn more about this file see: https://angular.io/config/tsconfig. */
+{
+  "compileOnSave": false,
+  "compilerOptions": {
+    "outDir": "./dist/out-tsc",
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "noImplicitOverride": true,
+    "noPropertyAccessFromIndexSignature": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "esModuleInterop": true,
+    "sourceMap": true,
+    "declaration": false,
+    "experimentalDecorators": true,
+    "moduleResolution": "node",
+    "importHelpers": true,
+    "target": "ES2022",
+    "module": "ES2022",
+    "useDefineForClassFields": false,
+    "lib": [
+      "ES2022",
+      "dom"
+    ]
+  },
+  "angularCompilerOptions": {
+    "enableI18nLegacyMessageIdFormat": false,
+    "strictInjectionParameters": true,
+    "strictInputAccessModifiers": true,
+    "strictTemplates": true
+  }
+}

TS/two-inputs/tsconfig.spec.json

@@ -0,0 +1,14 @@
+/* To learn more about this file see: https://angular.io/config/tsconfig. */
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./out-tsc/spec",
+    "types": [
+      "jasmine"
+    ]
+  },
+  "include": [
+    "src/**/*.spec.ts",
+    "src/**/*.d.ts"
+  ]
+}