import { ChangeDetectionStrategy, Component, inject } from '@angular/core';
import { RouterLink } from '@angular/router';
import { PageShellComponent } from '../../core/layout/page-shell.component';
import { SeoService } from '../../core/services/seo.service';
import { MAIN_NAVIGATION, PAGE_INDEX } from '../../shared/config/navigation.config';

type ProfileValue = string | number | readonly string[];
type TokenClass = 'k' | 's' | 'n' | 'p';
interface TerminalToken { readonly cls: TokenClass; readonly text: string; }
interface TerminalLine { readonly tokens: readonly TerminalToken[]; }

/** The `profile.json` shown in the hero. Order is render order. */
const PROFILE: readonly (readonly [string, ProfileValue])[] = [
  ['name', 'Amar Džanan'],
  ['role', 'Senior Full-Stack Engineer · Product Owner'],
  ['stack', ['.NET', 'Angular', 'Ionic', 'SQL Server']],
  ['focus', ['ERP & business systems', 'mobile', 'expert systems', 'safe AI integration']],
  ['since', 2018],
  ['location', 'Ljubljana · CET'],
  ['open_to', ['senior roles', 'consulting']]
];

function toTerminalLines(profile: readonly (readonly [string, ProfileValue])[]): TerminalLine[] {
  return profile.map(([key, value], index) => {
    const tokens: TerminalToken[] = [{ cls: 'k', text: `"${key}"` }, { cls: 'p', text: ': ' }];
    if (typeof value === 'number') {
      tokens.push({ cls: 'n', text: String(value) });
    } else if (typeof value === 'string') {
      tokens.push({ cls: 's', text: `"${value}"` });
    } else {
      tokens.push({ cls: 'p', text: '[' });
      value.forEach((item, itemIndex) => {
        if (itemIndex > 0) tokens.push({ cls: 'p', text: ', ' });
        tokens.push({ cls: 's', text: `"${item}"` });
      });
      tokens.push({ cls: 'p', text: ']' });
    }
    if (index < profile.length - 1) tokens.push({ cls: 'p', text: ',' });
    return { tokens };
  });
}

@Component({
  selector: 'app-landing-page',
  standalone: true,
  imports: [PageShellComponent, RouterLink],
  changeDetection: ChangeDetectionStrategy.OnPush,
  template: `
    <app-page-shell [sections]="sections">
      <section class="hero shell" aria-labelledby="hero-title">
        <div class="hero-copy">
          <p class="label">Senior full-stack engineer<span class="label-extra"> · product owner</span></p>
          <h1 id="hero-title">Complex systems, <span>understood before changed.</span></h1>
          <p class="hero-lead">I build and modernize full-stack business systems — ERP software, offline-first mobile apps for the field, rule-driven expert systems — and connect them to AI through narrow, validated, verified interfaces. The kind you can run in production and sleep at night.</p>
          <div class="hero-actions">
            <a class="btn btn-accent" href="mailto:amar@dzanan.net">amar&#64;dzanan.net</a>
            <a class="btn btn-line" routerLink="/cv">cv.pdf →</a>
          </div>
        </div>

        <div class="panel terminal" data-testid="profile-terminal" role="img" aria-label="Profile summary rendered as a JSON document">
          <div class="terminal-bar"><div class="terminal-dots" aria-hidden="true"><span></span><span></span><span></span></div><span class="terminal-title">profile.json</span><span class="terminal-spacer"></span></div>
          <div class="terminal-body">
            <div class="terminal-line"><span class="c">$ </span>whoami<span class="c"> --json</span></div>
            <div class="terminal-line">{{ '{' }}</div>
            @for (line of terminalLines; track $index) {
              <div class="terminal-line indent">@for (token of line.tokens; track $index) {<span [class]="token.cls">{{ token.text }}</span>}</div>
            }
            <div class="terminal-line">{{ '}' }}</div>
            <div class="terminal-line prompt"><span class="c">$ </span><span class="cursor" aria-hidden="true"></span></div>
          </div>
        </div>
      </section>

      <section class="section tight shell" aria-labelledby="index-title">
        <div class="section-head padded">
          <div><span class="label">// index</span><h2 id="index-title">ls ~/</h2></div>
          <span class="count">{{ pages.length }} entries</span>
        </div>
        <div class="panel index-list">
          @for (page of pages; track page.path) {
            <a data-testid="index-row" class="index-row" [routerLink]="page.path">
              <span class="name">{{ page.name }}</span>
              <p>{{ page.description }}</p>
              <span class="project-arrow" aria-hidden="true">→</span>
            </a>
          }
        </div>
      </section>
    </app-page-shell>
  `
})
export class LandingPageComponent {
  readonly sections = MAIN_NAVIGATION;
  readonly pages = PAGE_INDEX;
  readonly terminalLines = toTerminalLines(PROFILE);

  constructor() {
    inject(SeoService).update({
      title: 'Amar Džanan — Senior Software Engineer & AI Integration',
      description: 'Senior full-stack engineer building and modernizing ERP, mobile and expert systems — and connecting them safely to AI.',
      path: '/',
      structuredData: {
        '@context': 'https://schema.org',
        '@type': 'Person',
        name: 'Amar Džanan',
        url: 'https://dzanan.net/',
        email: 'mailto:amar@dzanan.net',
        jobTitle: 'Senior Software Engineer',
        sameAs: ['https://www.linkedin.com/in/amardzanan/'],
        address: { '@type': 'PostalAddress', addressLocality: 'Ljubljana', addressCountry: 'SI' },
        knowsAbout: ['.NET', 'Angular', 'TypeScript', 'Ionic', 'ERP software', 'Expert systems', 'Software architecture', 'Model Context Protocol', 'AI integration']
      }
    });
  }
}