Added ability to generate and copy identity card number.

src/app/app.module.ts

@@ -11,6 +11,7 @@ import { PeselComponent } from './components/pesel/pesel.component';
 import { NipComponent } from './components/nip/nip.component';
 import { RegonComponent } from './components/regon/regon.component';
 import { IbanComponent } from './components/iban/iban.component';
+import { IdentityCardComponent } from './components/identitycard/identitycard.component';
 import {NgOptimizedImage} from "@angular/common";
 
 @NgModule({
@@ -20,7 +21,8 @@ import {NgOptimizedImage} from "@angular/common";
     PeselComponent,
     NipComponent,
     RegonComponent,
-    IbanComponent
+    IbanComponent,
+    IdentityCardComponent
   ],
     imports: [
         BrowserModule,

src/app/components/app/app.component.html

@@ -3,5 +3,6 @@
     <app-regon></app-regon>
     <app-nip></app-nip>
     <app-pesel></app-pesel>
+    <app-identity-card></app-identity-card>
     <app-iban></app-iban>
-</div>
+</div>

src/app/components/identitycard/identitycard.component.html

@@ -0,0 +1,17 @@
+<div class="generator">
+    <div class="title">
+        <span>DOWÓD OSOBISTY</span>
+    </div>
+    <div class="container">
+        <input type="text" [formControl]="valueField" />
+
+        <div class="buttons">
+            <img id="identityCardGenerateButton" ngSrc="assets/autorenew_black_24dp.svg" title="Generuj numer dowodu" alt="Generuj numer dowodu" style="margin-left: 1em;" (click)="generate()"
+                 height="24" width="24"/>
+            <img id="identityCardCopyButton" ngSrc="assets/content_copy_black_24dp.svg" title="Skopiuj numer dowodu do schowka" alt="Skopiuj numer dowodu do schowka" style="margin: auto 1em;" (click)="copyToClipboard()"
+                 height="24" width="24"/>
+            <img id="identityCardHelpButton" ngSrc="assets/info_black_24dp.svg" title="Szczegóły dotyczące numeru dowodu" alt="Definicja numeru dowodu na Wikipedii" (click)="navigateToDocs()"
+                 height="24" width="24"/>
+        </div>
+    </div>
+</div>

src/app/components/identitycard/identitycard.component.ts

@@ -0,0 +1,35 @@
+import { Component, OnInit } from '@angular/core';
+import { AbstractControl, FormControl } from '@angular/forms';
+import { IdentityCardService } from 'src/app/service/identity-card.service';
+import { ClipboardService } from 'src/app/service/gui/clipboard.service';
+
+@Component({
+  selector: 'app-identity-card',
+  templateUrl: './identitycard.component.html',
+  styleUrls: ['./identitycard.component.scss'],
+  standalone: false
+})
+export class IdentityCardComponent implements OnInit {
+  public valueField: FormControl;
+
+  constructor(private identityCardService: IdentityCardService, private clipboardService: ClipboardService) {
+    this.valueField = new FormControl('');
+    this.valueField.setValidators([(control: AbstractControl) => this.identityCardService.validateIdentityCard(control.value)]);
+  }
+
+  ngOnInit(): void {
+    this.generate();
+  }
+
+  generate(): void {
+    this.valueField.setValue(this.identityCardService.generateIdentityCard());
+  }
+
+  copyToClipboard(): void {
+    this.clipboardService.copyToClipboard(this.valueField.value);
+  }
+
+  navigateToDocs(): void {
+    window.open('https://pl.wikipedia.org/wiki/Dow%C3%B3d_osobisty_w_Polsce#Numer_dowodu_osobistego', "_blank");
+  }
+}

src/app/service/identity-card.service.ts

@@ -0,0 +1,85 @@
+import { Injectable } from '@angular/core';
+import { ValidationErrors } from '@angular/forms';
+import { CommonService } from './common.service';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class IdentityCardService {
+  private static readonly weights: number[] = [7, 3, 1, 0, 7, 3, 1, 7, 3];
+  private static readonly letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
+
+  constructor(private common: CommonService) { }
+
+  public generateIdentityCard(): string {
+    let result = "";
+    // Generate 3 letters
+    for (let i = 0; i < 3; i++) {
+      result += IdentityCardService.letters.charAt(this.common.getRandomInt(0, 25));
+    }
+    // Generate 5 digits (for positions 4-8)
+    let digits = "";
+    for (let i = 0; i < 5; i++) {
+      digits += this.common.getRandomInt(0, 9).toString();
+    }
+
+    // Calculate sum
+    let sum = 0;
+    // Letters
+    for (let i = 0; i < 3; i++) {
+      sum += this.letterToValue(result.charAt(i)) * IdentityCardService.weights[i];
+    }
+    // Digits
+    for (let i = 0; i < 5; i++) {
+      sum += parseInt(digits.charAt(i), 10) * IdentityCardService.weights[i + 4];
+    }
+
+    const controlDigit = sum % 10;
+
+    return result + controlDigit + digits;
+  }
+
+  public validateIdentityCard(id: string): ValidationErrors | null {
+    const errors: ValidationErrors = {};
+    if (!id) {
+      errors.required = true;
+      return errors;
+    }
+
+    const upperId = id.toUpperCase();
+
+    if (upperId.length !== 9) {
+      if (upperId.length < 9) errors.tooShort = true;
+      else errors.tooLong = true;
+    }
+
+    const pattern = /^[A-Z]{3}[0-9]{6}$/;
+    if (!pattern.test(upperId)) {
+      errors.invalidPattern = true;
+    }
+
+    if (Object.keys(errors).length > 0) return errors;
+
+    // Control digit validation
+    let sum = 0;
+    for (let i = 0; i < 9; i++) {
+      if (i === 3) continue; // skip control digit
+      const char = upperId.charAt(i);
+      const val = i < 3 ? this.letterToValue(char) : parseInt(char, 10);
+      sum += val * IdentityCardService.weights[i];
+    }
+
+    const calculatedControl = sum % 10;
+    const actualControl = parseInt(upperId.charAt(3), 10);
+
+    if (calculatedControl !== actualControl) {
+      errors.invalidControlDigit = true;
+    }
+
+    return Object.keys(errors).length > 0 ? errors : null;
+  }
+
+  private letterToValue(letter: string): number {
+    return IdentityCardService.letters.indexOf(letter.toUpperCase()) + 10;
+  }
+}