/**
 * Lock Screen Controller
 *
 * Handles PIN-based lock screen functionality
 */

import { DrawerController } from './drawers';

export class LockScreenController {
  private static readonly CORRECT_PIN = '1234'; // Demo PIN

  private lockScreen: HTMLElement | null = null;
  private pinInput: HTMLElement | null = null;
  private pinKeypad: HTMLElement | null = null;
  private lockTimeEl: HTMLElement | null = null;
  private pinDigits: NodeListOf<HTMLElement> | null = null;
  private currentPin = '';
  private drawers: DrawerController | null = null;

  constructor(drawers?: DrawerController) {
    this.drawers = drawers ?? null;
    this.lockScreen = document.getElementById('lockScreen');
    this.pinInput = document.getElementById('pinInput');
    this.pinKeypad = document.getElementById('pinKeypad');
    this.lockTimeEl = document.getElementById('lockTime');
    this.pinDigits = this.pinInput?.querySelectorAll<HTMLElement>('swp-pin-digit') ?? null;

    this.setupListeners();
  }

  /**
   * Check if lock screen is active
   */
  get isActive(): boolean {
    return this.lockScreen?.classList.contains('active') ?? false;
  }

  /**
   * Show the lock screen
   */
  show(): void {
    this.drawers?.closeAll();

    if (this.lockScreen) {
      this.lockScreen.classList.add('active');
      document.body.style.overflow = 'hidden';
    }

    this.currentPin = '';
    this.updateDisplay();

    // Update lock time
    if (this.lockTimeEl) {
      this.lockTimeEl.textContent = `Låst kl. ${this.formatTime()}`;
    }
  }

  /**
   * Hide the lock screen
   */
  hide(): void {
    if (this.lockScreen) {
      this.lockScreen.classList.remove('active');
      document.body.style.overflow = '';
    }

    this.currentPin = '';
    this.updateDisplay();
  }

  private formatTime(): string {
    const now = new Date();
    const hours = now.getHours().toString().padStart(2, '0');
    const minutes = now.getMinutes().toString().padStart(2, '0');
    return `${hours}:${minutes}`;
  }

  private updateDisplay(): void {
    if (!this.pinDigits) return;

    this.pinDigits.forEach((digit, index) => {
      digit.classList.remove('filled', 'error');
      if (index < this.currentPin.length) {
        digit.textContent = '•';
        digit.classList.add('filled');
      } else {
        digit.textContent = '';
      }
    });
  }

  private showError(): void {
    if (!this.pinDigits) return;

    this.pinDigits.forEach(digit => digit.classList.add('error'));

    // Shake animation
    this.pinInput?.classList.add('shake');

    setTimeout(() => {
      this.currentPin = '';
      this.updateDisplay();
      this.pinInput?.classList.remove('shake');
    }, 500);
  }

  private verify(): void {
    if (this.currentPin === LockScreenController.CORRECT_PIN) {
      this.hide();
    } else {
      this.showError();
    }
  }

  private addDigit(digit: string): void {
    if (this.currentPin.length >= 4) return;

    this.currentPin += digit;
    this.updateDisplay();

    // Auto-verify when 4 digits entered
    if (this.currentPin.length === 4) {
      setTimeout(() => this.verify(), 200);
    }
  }

  private removeDigit(): void {
    if (this.currentPin.length === 0) return;
    this.currentPin = this.currentPin.slice(0, -1);
    this.updateDisplay();
  }

  private clearPin(): void {
    this.currentPin = '';
    this.updateDisplay();
  }

  private setupListeners(): void {
    // Keypad click handler
    this.pinKeypad?.addEventListener('click', (e) => this.handleKeypadClick(e));

    // Keyboard input
    document.addEventListener('keydown', (e) => this.handleKeyboard(e));

    // Lock button in sidebar
    document.querySelector<HTMLElement>('swp-side-menu-action.lock')
      ?.addEventListener('click', () => this.show());
  }

  private handleKeypadClick(e: Event): void {
    const target = e.target as HTMLElement;
    const key = target.closest<HTMLElement>('swp-pin-key');

    if (!key) return;

    const digit = key.dataset.digit;
    const action = key.dataset.action;

    if (digit) {
      this.addDigit(digit);
    } else if (action === 'backspace') {
      this.removeDigit();
    } else if (action === 'clear') {
      this.clearPin();
    }
  }

  private handleKeyboard(e: KeyboardEvent): void {
    if (!this.isActive) return;

    // Prevent default to avoid other interactions
    e.preventDefault();

    if (e.key >= '0' && e.key <= '9') {
      this.addDigit(e.key);
    } else if (e.key === 'Backspace') {
      this.removeDigit();
    } else if (e.key === 'Escape') {
      this.clearPin();
    }
  }
}