import { Component, OnInit, OnDestroy, HostListener } from '@angular/core';
import { CommonModule } from '@angular/common';
import { Router, NavigationEnd, RouterModule, RouterOutlet } from '@angular/router';
import { IconsModule } from '@progress/kendo-angular-icons';
import {
  SVGIcon,
  homeIcon,
  calendarIcon,
  userIcon,
  groupIcon,
  usersOutlineIcon,
  bedOutlineIcon,
  pillsOutlineIcon,
  graphIcon,
  buildingsOutlineIcon,
  banknoteOutlineIcon,
  questionCircleIcon,
  dollarIcon,
  categorizeIcon,
  moneyExchangeIcon,
  fileReportIcon,
  walletOutlineIcon,
  handIcon,
} from '@progress/kendo-svg-icons';
import { AuthService, UserInfo } from '../../shared/services/auth.service';
import { Subject, takeUntil, filter } from 'rxjs';

interface NavItem {
  text: string;
  icon: SVGIcon;
  path: string;
  active?: boolean;
}

@Component({
  selector: 'app-user-portal',
  standalone: true,
  imports: [
    CommonModule,
    RouterModule,
    RouterOutlet,
    IconsModule,
  ],
  templateUrl: './user-portal.component.html',
  styleUrls: ['./user-portal.component.scss']
})
export class UserPortalComponent implements OnInit, OnDestroy {
  sidebarCollapsed = false;
  isMobile = false;
  currentUser: UserInfo | null = null;
  currentPageTitle = 'Dashboard';
  unreadMessages = 3;
  unreadNotifications = 2;

  public homeIcon: SVGIcon = homeIcon;
  public calendarIcon: SVGIcon = calendarIcon;
  public peopleIcon: SVGIcon = usersOutlineIcon;
  public bedIcon: SVGIcon = bedOutlineIcon;
  public userIcon: SVGIcon = userIcon;
  public pillIcon: SVGIcon = pillsOutlineIcon;
  public chartIcon: SVGIcon = graphIcon;
  public buildingIcon: SVGIcon = buildingsOutlineIcon;
  public creditCardIcon: SVGIcon = banknoteOutlineIcon;
  public supportIcon: SVGIcon = questionCircleIcon;

  public mainNavItems: NavItem[] = [
    { text: 'Dashboard', icon: this.homeIcon, path: '/user-portal/dashboard' },
    // { text: 'Schedule', icon: this.calendarIcon, path: '/user-portal/schedule' },
    // { text: 'Patients', icon: this.peopleIcon, path: '/user-portal/patients' },
  ];

  public managementNavItems: NavItem[] = [
    // { text: 'Staff', icon: this.userIcon, path: '/user-portal/staff' },
    // { text: 'Pharmacy', icon: this.pillIcon, path: '/user-portal/pharmacy' },
    // { text: 'Reports', icon: this.chartIcon, path: '/user-portal/reports' },1124
    // { text: 'Departments', icon: this.buildingIcon, path: '/user-portal/departments' },
    // { text: 'Payments', icon: this.creditCardIcon, path: '/user-portal/payments' },
  ];

  public supportNavItems: NavItem[] = [
    { text: 'Support', icon: this.supportIcon, path: '/user-portal/support' },
  ];

  public memberAdminNavItems: NavItem[] = [
    { text: 'Members', icon: groupIcon, path: '/user-portal/admin/members' },
  ];

  public userAdminNavItems: NavItem[] = [
    { text: 'User Management', icon: userIcon, path: '/user-portal/admin/users' },
  ];

  public financeNavItems: NavItem[] = [
    { text: 'Finance Dashboard',   icon: graphIcon,           path: '/user-portal/finance/dashboard' },
    { text: 'Offering Entry',      icon: handIcon,            path: '/user-portal/finance/offering-session' },
    { text: 'Givings',             icon: dollarIcon,          path: '/user-portal/finance/givings' },
    { text: 'Giving Types',        icon: categorizeIcon,      path: '/user-portal/finance/giving-categories' },
    { text: 'Expenses',            icon: moneyExchangeIcon,   path: '/user-portal/finance/expenses' },
    { text: 'Expense Categories',  icon: categorizeIcon,      path: '/user-portal/finance/expense-categories' },
    { text: 'Disbursements',       icon: banknoteOutlineIcon, path: '/user-portal/finance/disbursements' },
    { text: 'Check Register',      icon: walletOutlineIcon,   path: '/user-portal/finance/check-register' },
    { text: 'Monthly Statement',   icon: fileReportIcon,      path: '/user-portal/finance/monthly-statement' },
    { text: 'Church Profile',      icon: buildingsOutlineIcon, path: '/user-portal/finance/church-profile' },
  ];

  public personalNavItems: NavItem[] = [
    { text: 'My Reimbursements', icon: walletOutlineIcon, path: '/user-portal/reimbursements' },
  ];

  public showMemberAdminSection = false;
  public showUserAdminSection = false;
  public showFinanceSection = false;

  private destroy$ = new Subject<void>();

  constructor(
    private authService: AuthService,
    private router: Router
  ) { }

  ngOnInit(): void {
    this.checkScreenSize();
    this.setupUserSubscription();
    this.setupRouteSubscription();
  }

  ngOnDestroy(): void {
    this.destroy$.next();
    this.destroy$.complete();
  }

  @HostListener('window:resize', ['$event'])
  onResize(event: any): void {
    this.checkScreenSize();
  }

  private checkScreenSize(): void {
    this.isMobile = window.innerWidth <= 768;
    if (this.isMobile) {
      this.sidebarCollapsed = true;
    } else {
      // On desktop, start with sidebar expanded
      this.sidebarCollapsed = false;
    }
  }

  private setupUserSubscription(): void {
    this.authService.currentUser$
      .pipe(takeUntil(this.destroy$))
      .subscribe(user => {
        this.currentUser = user;
        const roles = user?.roles ?? [];
        this.showMemberAdminSection = roles.some(r => r === 'super_admin' || r === 'secretary');
        this.showUserAdminSection = roles.includes('super_admin');
        this.showFinanceSection = roles.some(r => r === 'finance' || r === 'super_admin');
      });
  }

  private setupRouteSubscription(): void {
    this.router.events
      .pipe(
        filter(event => event instanceof NavigationEnd),
        takeUntil(this.destroy$)
      )
      .subscribe((event: NavigationEnd) => {
        this.updateActiveStates(event.url);
        this.updatePageTitle();
      });

    this.updateActiveStates(this.router.url);
    this.updatePageTitle();
  }

  public navigateTo(path: string): void {
    this.router.navigate([path]);
    this.onNavigationClick();
  }

  private updateActiveStates(currentUrl: string): void {
    const allItems = [
      ...this.mainNavItems,
      ...this.managementNavItems,
      ...this.supportNavItems,
      ...this.memberAdminNavItems,
      ...this.userAdminNavItems,
      ...this.financeNavItems,
      ...this.personalNavItems,
    ];
    allItems.forEach(item => (item.active = false));

    const activeItem = allItems.find(item => currentUrl.startsWith(item.path));
    if (activeItem) {
      activeItem.active = true;
    }
  }

  private updatePageTitle(): void {
    const url = this.router.url;
    const segments = url.split('/').filter(s => s);
    const key = segments.length >= 3
      ? `${segments[1]}/${segments[2]}`   // e.g. 'admin/members'
      : segments[1] ?? '';
    this.currentPageTitle = this.getPageTitle(key);
  }

  private getPageTitle(page: string): string {
    const titles: { [key: string]: string } = {
      'dashboard': 'Dashboard',
      'schedule': 'Schedule',
      'patients': 'Patients',
      'bed-management': 'Bed Management',
      'staff': 'Staff',
      'pharmacy': 'Pharmacy',
      'reports': 'Reports',
      'departments': 'Departments',
      'payments': 'Payments',
      'support': 'Support',
      'transactions': 'Escrow Transactions',
      'tasks': 'Tasks & Todos',
      'contacts': 'Contacts',
      'documents': 'Documents',
      'messages': 'Messages',
      'settings': 'Settings',
      'admin/members': 'Member Management',
      'admin/users': 'User Management',
      'finance/dashboard': 'Finance Dashboard',
      'finance/offering-session': 'Sunday Offering Entry',
      'finance/givings': 'Givings',
      'finance/giving-categories': 'Giving Types',
      'reimbursements': 'My Reimbursements',
      'finance/expenses': 'Expenses',
      'finance/expense-categories': 'Expense Categories',
      'finance/disbursements': 'Disbursement Management',
      'finance/check-register': 'Check Register',
      'finance/monthly-statement': 'Monthly Statement',
      'finance/church-profile': 'Church Profile',
    };
    return titles[page] ?? 'Dashboard';
  }

  toggleSidebar(): void {
    this.sidebarCollapsed = !this.sidebarCollapsed;
  }

  get mainContentClass(): string {
    return this.sidebarCollapsed ? 'main-content sidebar-collapsed' : 'main-content';
  }

  onSidebarOverlayClick(): void {
    if (this.isMobile && !this.sidebarCollapsed) {
      this.sidebarCollapsed = true;
    }
  }

  onNavigationClick(): void {
    if (this.isMobile) {
      this.sidebarCollapsed = true;
    }
  }

  logout(): void {
    this.authService.logout();
    this.router.navigate(['/login']);
  }

  getDisplayName(): string {
    return this.currentUser?.email || '';
  }
}