/**
 * Suppliers Controller
 *
 * Handles:
 * - Fuzzy search with Fuse.js
 * - Row click navigation
 */

import Fuse from 'fuse.js';

interface SupplierItem {
  name: string;
  contact: string;
  city: string;
  element: HTMLElement;
}

export class SuppliersController {
  private fuse: Fuse<SupplierItem> | null = null;
  private suppliers: SupplierItem[] = [];
  private searchInput: HTMLInputElement | null = null;
  private emptyState: HTMLElement | null = null;
  private dataTable: HTMLElement | null = null;

  constructor() {
    // Only initialize if we're on the suppliers page
    const suppliersTable = document.querySelector('swp-card.suppliers-list');
    if (!suppliersTable) return;

    this.init();
  }

  private init(): void {
    this.searchInput = document.getElementById('supplierSearchInput') as HTMLInputElement;
    this.emptyState = document.getElementById('supplierEmptyState');
    this.dataTable = document.querySelector('swp-card.suppliers-list swp-data-table');

    this.buildSupplierIndex();
    this.setupSearch();
    this.setupRowNavigation();
  }

  private buildSupplierIndex(): void {
    const supplierRows = document.querySelectorAll('swp-card.suppliers-list swp-data-table-row');

    supplierRows.forEach((row) => {
      const element = row as HTMLElement;

      const name = element.dataset.name || '';
      const contact = element.dataset.contact || '';
      const city = element.dataset.city || '';

      this.suppliers.push({
        name,
        contact,
        city,
        element
      });
    });
  }

  private setupSearch(): void {
    if (!this.searchInput) return;

    // Initialize Fuse.js with multiple search keys
    this.fuse = new Fuse(this.suppliers, {
      keys: ['name', 'contact', 'city'],
      threshold: 0.3,
      minMatchCharLength: 2
    });

    // Listen for input with debounce
    let debounceTimer: number;
    this.searchInput.addEventListener('input', (e) => {
      clearTimeout(debounceTimer);
      debounceTimer = window.setTimeout(() => {
        const query = (e.target as HTMLInputElement).value.trim();
        this.filterSuppliers(query);
      }, 150);
    });
  }

  private filterSuppliers(query: string): void {
    if (!query || query.length < 2) {
      this.showAll();
      return;
    }

    if (!this.fuse) return;

    // Get matching suppliers
    const results = this.fuse.search(query);
    const matchingSuppliers = new Set(results.map(r => r.item.element));

    let visibleCount = 0;

    // Show/hide suppliers
    this.suppliers.forEach(supplier => {
      if (matchingSuppliers.has(supplier.element)) {
        supplier.element.style.display = 'grid';
        visibleCount++;
      } else {
        supplier.element.style.display = 'none';
      }
    });

    // Show/hide empty state
    this.updateEmptyState(visibleCount);
  }

  private showAll(): void {
    this.suppliers.forEach(supplier => {
      supplier.element.style.display = 'grid';
    });
    this.updateEmptyState(this.suppliers.length);
  }

  private updateEmptyState(visibleCount: number): void {
    if (!this.emptyState || !this.dataTable) return;

    if (visibleCount === 0) {
      this.emptyState.style.display = 'flex';
      // Hide header when no results
      const header = this.dataTable.querySelector('swp-data-table-header') as HTMLElement;
      if (header) header.style.display = 'none';
    } else {
      this.emptyState.style.display = 'none';
      // Show header when results exist
      const header = this.dataTable.querySelector('swp-data-table-header') as HTMLElement;
      if (header) header.style.display = 'grid';
    }
  }

  private setupRowNavigation(): void {
    // Click on rows navigates to supplier detail page
    document.addEventListener('click', (e) => {
      const row = (e.target as HTMLElement).closest<HTMLElement>('swp-card.suppliers-list swp-data-table-row[data-href]');
      if (!row) return;

      const href = row.dataset.href;
      if (href) {
        window.location.href = href;
      }
    });
  }
}