import {
  Component,
  inject,
  signal
} from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { Store } from '@ngrx/store';
import { NgIcon, provideIcons } from '@ng-icons/core';
import {
  lucideShield,
  lucideBan,
  lucideUserX,
  lucideSettings,
  lucideUsers,
  lucideTrash2,
  lucideCheck,
  lucideX,
  lucideLock,
  lucideUnlock
} from '@ng-icons/lucide';

import { UsersActions } from '../../../store/users/users.actions';
import { RoomsActions } from '../../../store/rooms/rooms.actions';
import { selectCurrentRoom } from '../../../store/rooms/rooms.selectors';
import {
  selectBannedUsers,
  selectIsCurrentUserAdmin,
  selectCurrentUser,
  selectOnlineUsers
} from '../../../store/users/users.selectors';
import { BanEntry, User } from '../../../core/models/index';
import { WebRTCService } from '../../../core/services/webrtc.service';
import { UserAvatarComponent, ConfirmDialogComponent } from '../../../shared';

type AdminTab = 'settings' | 'members' | 'bans' | 'permissions';

@Component({
  selector: 'app-admin-panel',
  standalone: true,
  imports: [
    CommonModule,
    FormsModule,
    NgIcon,
    UserAvatarComponent,
    ConfirmDialogComponent
  ],
  viewProviders: [
    provideIcons({
      lucideShield,
      lucideBan,
      lucideUserX,
      lucideSettings,
      lucideUsers,
      lucideTrash2,
      lucideCheck,
      lucideX,
      lucideLock,
      lucideUnlock
    })
  ],
  templateUrl: './admin-panel.component.html'
})
/**
 * Admin panel for managing room settings, members, bans, and permissions.
 * Only accessible to users with admin privileges.
 */
export class AdminPanelComponent {
  store = inject(Store);

  currentRoom = this.store.selectSignal(selectCurrentRoom);
  currentUser = this.store.selectSignal(selectCurrentUser);
  isAdmin = this.store.selectSignal(selectIsCurrentUserAdmin);
  bannedUsers = this.store.selectSignal(selectBannedUsers);
  onlineUsers = this.store.selectSignal(selectOnlineUsers);

  activeTab = signal<AdminTab>('settings');
  showDeleteConfirm = signal(false);

  // Settings
  roomName = '';
  roomDescription = '';
  isPrivate = signal(false);
  maxUsers = 0;

  // Permissions
  allowVoice = true;
  allowScreenShare = true;
  allowFileUploads = true;
  slowModeInterval = '0';
  adminsManageRooms = false;
  moderatorsManageRooms = false;
  adminsManageIcon = false;
  moderatorsManageIcon = false;

  private webrtc = inject(WebRTCService);

  constructor() {
    // Initialize from current room
    const room = this.currentRoom();

    if (room) {
      this.roomName = room.name;
      this.roomDescription = room.description || '';
      this.isPrivate.set(room.isPrivate);
      this.maxUsers = room.maxUsers || 0;
      const perms = room.permissions || {};

      this.allowVoice = perms.allowVoice !== false;
      this.allowScreenShare = perms.allowScreenShare !== false;
      this.allowFileUploads = perms.allowFileUploads !== false;
      this.slowModeInterval = String(perms.slowModeInterval ?? 0);
      this.adminsManageRooms = !!perms.adminsManageRooms;
      this.moderatorsManageRooms = !!perms.moderatorsManageRooms;
      this.adminsManageIcon = !!perms.adminsManageIcon;
      this.moderatorsManageIcon = !!perms.moderatorsManageIcon;
    }
  }

  /** Toggle the room's private visibility setting. */
  togglePrivate(): void {
    this.isPrivate.update((current) => !current);
  }

  /** Save the current room name, description, privacy, and max-user settings. */
  saveSettings(): void {
    const room = this.currentRoom();

    if (!room)
      return;

    this.store.dispatch(
      RoomsActions.updateRoomSettings({
        roomId: room.id,
        settings: {
          name: this.roomName,
          description: this.roomDescription,
          isPrivate: this.isPrivate(),
          maxUsers: this.maxUsers
        }
      })
    );
  }

  /** Persist updated room permissions (voice, screen-share, uploads, slow-mode, role grants). */
  savePermissions(): void {
    const room = this.currentRoom();

    if (!room)
      return;

    this.store.dispatch(
      RoomsActions.updateRoomPermissions({
        roomId: room.id,
        permissions: {
          allowVoice: this.allowVoice,
          allowScreenShare: this.allowScreenShare,
          allowFileUploads: this.allowFileUploads,
          slowModeInterval: parseInt(this.slowModeInterval, 10),
          adminsManageRooms: this.adminsManageRooms,
          moderatorsManageRooms: this.moderatorsManageRooms,
          adminsManageIcon: this.adminsManageIcon,
          moderatorsManageIcon: this.moderatorsManageIcon
        }
      })
    );
  }

  /** Remove a user's ban entry. */
  unbanUser(ban: BanEntry): void {
    this.store.dispatch(UsersActions.unbanUser({ roomId: ban.roomId,
      oderId: ban.oderId }));
  }

  /** Show the delete-room confirmation dialog. */
  confirmDeleteRoom(): void {
    this.showDeleteConfirm.set(true);
  }

  /** Delete the current room after confirmation. */
  deleteRoom(): void {
    const room = this.currentRoom();

    if (!room)
      return;

    this.store.dispatch(RoomsActions.deleteRoom({ roomId: room.id }));
    this.showDeleteConfirm.set(false);
  }

  /** Format a ban expiry timestamp into a human-readable date/time string. */
  formatExpiry(timestamp: number): string {
    const date = new Date(timestamp);

    return date.toLocaleDateString() + ' ' + date.toLocaleTimeString([], { hour: '2-digit',
      minute: '2-digit' });
  }

  // Members tab: get all users except self
  /** Return online users excluding the current user (for the members list). */
  membersFiltered(): User[] {
    const me = this.currentUser();

    return this.onlineUsers().filter(user => user.id !== me?.id && user.oderId !== me?.oderId);
  }

  /** Change a member's role and notify connected peers. */
  changeRole(user: User, role: 'admin' | 'moderator' | 'member'): void {
    const roomId = this.currentRoom()?.id;

    this.store.dispatch(UsersActions.updateUserRole({ userId: user.id,
      role }));

    this.webrtc.broadcastMessage({
      type: 'role-change',
      roomId,
      targetUserId: user.id,
      role
    });
  }

  /** Kick a member from the server. */
  kickMember(user: User): void {
    this.store.dispatch(UsersActions.kickUser({ userId: user.id }));
  }

  /** Ban a member from the server. */
  banMember(user: User): void {
    this.store.dispatch(UsersActions.banUser({ userId: user.id }));
  }
}