/**
 * Customers Controller
 *
 * Handles:
 * - Fuzzy search with Fuse.js
 * - Customer drawer population
 * - Customer detail economy chart
 */

import Fuse from 'fuse.js';
import { createChart } from '@sevenweirdpeople/swp-charting';

interface CustomerItem {
  name: string;
  phone: string;
  email: string;
  visits: string;
  created: string;
  tags: string;
  hairdresser: string;
  element: HTMLElement;
}

export class CustomersController {
  private fuse: Fuse<CustomerItem> | null = null;
  private customers: CustomerItem[] = [];
  private searchInput: HTMLInputElement | null = null;
  private emptyState: HTMLElement | null = null;
  private dataTable: HTMLElement | null = null;

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

    this.init();
  }

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

    this.buildCustomerIndex();
    this.setupSearch();
    this.setupDrawerPopulation();
  }

  private buildCustomerIndex(): void {
    const customerRows = document.querySelectorAll('swp-card.customers-list swp-data-table-row');

    customerRows.forEach((row) => {
      const element = row as HTMLElement;
      const cells = element.querySelectorAll('swp-data-table-cell');

      const name = element.dataset.name || '';
      const phone = cells[1]?.textContent?.trim() || '';
      const email = cells[2]?.textContent?.trim() || '';
      const visits = element.dataset.visits || '';
      const created = element.dataset.created || '';
      const tags = element.dataset.tags || '';
      const hairdresser = cells[5]?.textContent?.trim() || '';

      this.customers.push({
        name,
        phone,
        email,
        visits,
        created,
        tags,
        hairdresser,
        element
      });
    });
  }

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

    // Initialize Fuse.js with multiple search keys
    this.fuse = new Fuse(this.customers, {
      keys: ['name', 'phone', 'email'],
      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.filterCustomers(query);
      }, 150);
    });
  }

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

    if (!this.fuse) return;

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

    let visibleCount = 0;

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

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

  private showAll(): void {
    this.customers.forEach(customer => {
      customer.element.style.display = 'grid';
    });
    this.updateEmptyState(this.customers.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 setupDrawerPopulation(): void {
    // Listen for clicks on customer rows to populate drawer
    document.addEventListener('click', (e) => {
      const row = (e.target as HTMLElement).closest<HTMLElement>('swp-data-table-row[data-drawer-trigger="customer-drawer"]');
      if (!row) return;

      this.populateDrawer(row);
    });
  }

  private populateDrawer(row: HTMLElement): void {
    const cells = row.querySelectorAll('swp-data-table-cell');

    const name = row.dataset.name || '';
    const phone = cells[1]?.textContent?.trim() || '';
    const email = cells[2]?.textContent?.trim() || '';
    const visits = row.dataset.visits || '';
    const created = row.dataset.created || '';
    const tags = row.dataset.tags || '';
    const hairdresser = cells[5]?.textContent?.trim() || '';

    // Generate initials
    const initials = name.split(' ').map(n => n[0]).join('').toUpperCase();

    // Format "Kunde siden"
    const createdDate = created ? this.formatCreatedDate(created) : 'Ukendt';

    // Update drawer elements
    const drawerAvatar = document.getElementById('drawerAvatar');
    const drawerName = document.getElementById('drawerName');
    const drawerSince = document.getElementById('drawerSince');
    const drawerPhoneLink = document.getElementById('drawerPhoneLink') as HTMLAnchorElement;
    const drawerEmailLink = document.getElementById('drawerEmailLink') as HTMLAnchorElement;
    const drawerVisits = document.getElementById('drawerVisits');
    const drawerHairdresser = document.getElementById('drawerHairdresser');
    const drawerTags = document.getElementById('drawerTags');
    const editPhone = document.getElementById('editPhone') as HTMLInputElement;
    const editEmail = document.getElementById('editEmail') as HTMLInputElement;

    if (drawerAvatar) drawerAvatar.textContent = initials;
    if (drawerName) drawerName.textContent = name;
    if (drawerSince) drawerSince.textContent = `Kunde siden ${createdDate}`;

    if (drawerPhoneLink) {
      drawerPhoneLink.textContent = phone;
      drawerPhoneLink.href = `tel:${phone.replace(/\s/g, '')}`;
    }

    if (drawerEmailLink) {
      drawerEmailLink.textContent = email;
      drawerEmailLink.href = `mailto:${email}`;
    }

    if (drawerVisits) drawerVisits.textContent = visits;
    if (drawerHairdresser) drawerHairdresser.textContent = hairdresser;

    // Update editable fields
    if (editPhone) editPhone.value = phone;
    if (editEmail) editEmail.value = email;

    // Update tags
    if (drawerTags) {
      drawerTags.innerHTML = '';
      if (tags) {
        tags.split(',').forEach(tag => {
          const tagEl = document.createElement('swp-tag');
          tagEl.className = tag.trim();
          tagEl.textContent = this.formatTagLabel(tag.trim());
          drawerTags.appendChild(tagEl);
        });
      }
    }
  }

  private formatCreatedDate(dateStr: string): string {
    const months = [
      'januar', 'februar', 'marts', 'april', 'maj', 'juni',
      'juli', 'august', 'september', 'oktober', 'november', 'december'
    ];
    const [year, month] = dateStr.split('-');
    const monthIndex = parseInt(month, 10) - 1;
    return `${months[monthIndex]} ${year}`;
  }

  private formatTagLabel(tag: string): string {
    // Capitalize first letter
    return tag.charAt(0).toUpperCase() + tag.slice(1);
  }
}

/**
 * Customer Economy Controller
 *
 * Handles the economy chart on customer detail page.
 * Initializes chart lazily when economy tab is shown.
 */
interface ChartDataPoint {
  x: string;
  y: number;
}

interface ChartSeries {
  name: string;
  color: string;
  data: ChartDataPoint[];
}

interface CustomerChartData {
  categories: string[];
  series: ChartSeries[];
}

class CustomerEconomyController {
  private chartInitialized = false;
  private chart: ReturnType<typeof createChart> | null = null;

  constructor() {
    this.setupTabListener();
    // Check if economy tab is already active on page load
    this.checkInitialTab();
  }

  private setupTabListener(): void {
    document.addEventListener('click', (e: Event) => {
      const target = e.target as HTMLElement;
      const tab = target.closest<HTMLElement>('swp-tab[data-tab="economy"]');

      if (tab) {
        // Small delay to let tab content become visible
        setTimeout(() => this.initializeChart(), 50);
      }
    });
  }

  private checkInitialTab(): void {
    const activeTab = document.querySelector('swp-tab[data-tab="economy"].active');
    if (activeTab) {
      this.initializeChart();
    }
  }

  private initializeChart(): void {
    if (this.chartInitialized) return;

    const container = document.getElementById('customerRevenueChart');
    if (!container) return;

    const dataScript = document.getElementById('customerRevenueChartData');
    if (!dataScript) return;

    try {
      const data = JSON.parse(dataScript.textContent || '') as CustomerChartData;
      this.createRevenueChart(container, data);
      this.chartInitialized = true;
    } catch (err) {
      console.error('Failed to parse chart data:', err);
    }
  }

  private createRevenueChart(container: HTMLElement, data: CustomerChartData): void {
    this.chart = createChart(container, {
      deferRender: true,
      height: 200,
      xAxis: {
        categories: data.categories
      },
      series: data.series.map(s => ({
        name: s.name,
        color: s.color,
        data: s.data
      })),
      legend: false
    });
  }
}

// Initialize economy controller if on customer detail page
if (document.getElementById('customerRevenueChart') || document.querySelector('swp-tab[data-tab="economy"]')) {
  new CustomerEconomyController();
}