/* eslint-disable @typescript-eslint/member-ordering */
import {
  Component,
  effect,
  inject,
  OnInit,
  signal
} from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';
import { Router } from '@angular/router';
import { Store } from '@ngrx/store';
import {
  debounceTime,
  distinctUntilChanged,
  firstValueFrom,
  Subject
} from 'rxjs';
import { NgIcon, provideIcons } from '@ng-icons/core';
import {
  lucideSearch,
  lucideUsers,
  lucideLock,
  lucideGlobe,
  lucidePlus,
  lucideSettings
} from '@ng-icons/lucide';

import { RoomsActions } from '../../store/rooms/rooms.actions';
import {
  selectSearchResults,
  selectIsSearching,
  selectRoomsError,
  selectSavedRooms
} from '../../store/rooms/rooms.selectors';
import {
  Room,
  ServerInfo,
  User
} from '../../core/models/index';
import { SettingsModalService } from '../../core/services/settings-modal.service';
import { DatabaseService } from '../../core/services/database.service';
import { ServerDirectoryService } from '../../core/services/server-directory.service';
import { selectCurrentUser } from '../../store/users/users.selectors';
import { ConfirmDialogComponent } from '../../shared';
import { hasRoomBanForUser } from '../../core/helpers/room-ban.helpers';

@Component({
  selector: 'app-server-search',
  standalone: true,
  imports: [
    CommonModule,
    FormsModule,
    NgIcon,
    ConfirmDialogComponent
  ],
  viewProviders: [
    provideIcons({
      lucideSearch,
      lucideUsers,
      lucideLock,
      lucideGlobe,
      lucidePlus,
      lucideSettings
    })
  ],
  templateUrl: './server-search.component.html'
})
/**
 * Server search and discovery view with server creation dialog.
 * Allows users to search for, join, and create new servers.
 */
export class ServerSearchComponent implements OnInit {
  private store = inject(Store);
  private router = inject(Router);
  private settingsModal = inject(SettingsModalService);
  private db = inject(DatabaseService);
  private serverDirectory = inject(ServerDirectoryService);
  private searchSubject = new Subject<string>();
  private banLookupRequestVersion = 0;

  searchQuery = '';
  searchResults = this.store.selectSignal(selectSearchResults);
  isSearching = this.store.selectSignal(selectIsSearching);
  error = this.store.selectSignal(selectRoomsError);
  savedRooms = this.store.selectSignal(selectSavedRooms);
  currentUser = this.store.selectSignal(selectCurrentUser);
  activeEndpoints = this.serverDirectory.activeServers;
  bannedServerLookup = signal<Record<string, boolean>>({});
  bannedServerName = signal('');
  showBannedDialog = signal(false);
  showPasswordDialog = signal(false);
  passwordPromptServer = signal<ServerInfo | null>(null);
  joinPassword = signal('');
  joinPasswordError = signal<string | null>(null);
  joinErrorMessage = signal<string | null>(null);

  // Create dialog state
  showCreateDialog = signal(false);
  newServerName = signal('');
  newServerDescription = signal('');
  newServerTopic = signal('');
  newServerPrivate = signal(false);
  newServerPassword = signal('');
  newServerSourceId = '';

  constructor() {
    effect(() => {
      const servers = this.searchResults();
      const currentUser = this.currentUser();

      void this.refreshBannedLookup(servers, currentUser ?? null);
    });
  }

  /** Initialize server search, load saved rooms, and set up debounced search. */
  ngOnInit(): void {
    // Initial load
    this.store.dispatch(RoomsActions.searchServers({ query: '' }));
    this.store.dispatch(RoomsActions.loadRooms());

    // Setup debounced search
    this.searchSubject.pipe(debounceTime(300), distinctUntilChanged()).subscribe((query) => {
      this.store.dispatch(RoomsActions.searchServers({ query }));
    });
  }

  /** Emit a search query to the debounced search subject. */
  onSearchChange(query: string): void {
    this.searchSubject.next(query);
  }

  /** Join a server from the search results. Redirects to login if unauthenticated. */
  async joinServer(server: ServerInfo): Promise<void> {
    const currentUserId = localStorage.getItem('metoyou_currentUserId');

    if (!currentUserId) {
      this.router.navigate(['/login']);
      return;
    }

    if (await this.isServerBanned(server)) {
      this.bannedServerName.set(server.name);
      this.showBannedDialog.set(true);
      return;
    }

    await this.attemptJoinServer(server);
  }

  /** Open the create-server dialog. */
  openCreateDialog(): void {
    this.newServerSourceId = this.activeEndpoints()[0]?.id ?? '';
    this.showCreateDialog.set(true);
  }

  /** Close the create-server dialog and reset the form. */
  closeCreateDialog(): void {
    this.showCreateDialog.set(false);
    this.resetCreateForm();
  }

  /** Submit the new server creation form and dispatch the create action. */
  createServer(): void {
    if (!this.newServerName())
      return;

    const currentUserId = localStorage.getItem('metoyou_currentUserId');

    if (!currentUserId) {
      this.router.navigate(['/login']);
      return;
    }

    this.store.dispatch(
      RoomsActions.createRoom({
        name: this.newServerName(),
        description: this.newServerDescription() || undefined,
        topic: this.newServerTopic() || undefined,
        isPrivate: this.newServerPrivate(),
        password: this.newServerPassword().trim() || undefined,
        sourceId: this.newServerSourceId || undefined
      })
    );

    this.closeCreateDialog();
  }

  /** Open the unified settings modal to the Network page. */
  openSettings(): void {
    this.settingsModal.open('network');
  }

  /** Join a previously saved room by converting it to a ServerInfo payload. */
  joinSavedRoom(room: Room): void {
    void this.joinServer(this.toServerInfo(room));
  }

  closeBannedDialog(): void {
    this.showBannedDialog.set(false);
    this.bannedServerName.set('');
  }

  closePasswordDialog(): void {
    this.showPasswordDialog.set(false);
    this.passwordPromptServer.set(null);
    this.joinPassword.set('');
    this.joinPasswordError.set(null);
  }

  async confirmPasswordJoin(): Promise<void> {
    const server = this.passwordPromptServer();

    if (!server)
      return;

    await this.attemptJoinServer(server, this.joinPassword());
  }

  isServerMarkedBanned(server: ServerInfo): boolean {
    return !!this.bannedServerLookup()[server.id];
  }

  getServerUserCount(server: ServerInfo): number {
    const candidate = server as ServerInfo & { currentUsers?: number };

    if (typeof server.userCount === 'number')
      return server.userCount;

    return typeof candidate.currentUsers === 'number' ? candidate.currentUsers : 0;
  }

  getServerCapacityLabel(server: ServerInfo): string {
    return server.maxUsers > 0 ? String(server.maxUsers) : '∞';
  }

  private toServerInfo(room: Room): ServerInfo {
    return {
      id: room.id,
      name: room.name,
      description: room.description,
      hostName: room.hostId || 'Unknown',
      userCount: room.userCount ?? 0,
      maxUsers: room.maxUsers ?? 50,
      hasPassword: typeof room.hasPassword === 'boolean' ? room.hasPassword : !!room.password,
      isPrivate: room.isPrivate,
      createdAt: room.createdAt,
      ownerId: room.hostId,
      sourceId: room.sourceId,
      sourceName: room.sourceName,
      sourceUrl: room.sourceUrl
    };
  }

  private async attemptJoinServer(server: ServerInfo, password?: string): Promise<void> {
    const currentUserId = localStorage.getItem('metoyou_currentUserId');
    const currentUser = this.currentUser();

    if (!currentUserId) {
      this.router.navigate(['/login']);
      return;
    }

    this.joinErrorMessage.set(null);
    this.joinPasswordError.set(null);

    try {
      const response = await firstValueFrom(this.serverDirectory.requestJoin({
        roomId: server.id,
        userId: currentUserId,
        userPublicKey: currentUser?.oderId || currentUserId,
        displayName: currentUser?.displayName || 'Anonymous',
        password: password?.trim() || undefined
      }, {
        sourceId: server.sourceId,
        sourceUrl: server.sourceUrl
      }));
      const resolvedServer = response.server ?? server;

      this.closePasswordDialog();
      this.store.dispatch(
        RoomsActions.joinRoom({
          roomId: resolvedServer.id,
          serverInfo: resolvedServer
        })
      );
    } catch (error: unknown) {
      const serverError = error as {
        error?: { error?: string; errorCode?: string };
      };
      const errorCode = serverError?.error?.errorCode;
      const message = serverError?.error?.error || 'Failed to join server';

      if (errorCode === 'PASSWORD_REQUIRED') {
        this.passwordPromptServer.set(server);
        this.showPasswordDialog.set(true);
        this.joinPasswordError.set(message);
        return;
      }

      if (errorCode === 'BANNED') {
        this.bannedServerName.set(server.name);
        this.showBannedDialog.set(true);
        return;
      }

      this.joinErrorMessage.set(message);
    }
  }

  private async refreshBannedLookup(servers: ServerInfo[], currentUser: User | null): Promise<void> {
    const requestVersion = ++this.banLookupRequestVersion;

    if (!currentUser || servers.length === 0) {
      this.bannedServerLookup.set({});
      return;
    }

    const currentUserId = localStorage.getItem('metoyou_currentUserId');
    const entries = await Promise.all(
      servers.map(async (server) => {
        const bans = await this.db.getBansForRoom(server.id);
        const isBanned = hasRoomBanForUser(bans, currentUser, currentUserId);

        return [server.id, isBanned] as const;
      })
    );

    if (requestVersion !== this.banLookupRequestVersion)
      return;

    this.bannedServerLookup.set(Object.fromEntries(entries));
  }

  private async isServerBanned(server: ServerInfo): Promise<boolean> {
    const currentUser = this.currentUser();
    const currentUserId = localStorage.getItem('metoyou_currentUserId');

    if (!currentUser && !currentUserId)
      return false;

    const bans = await this.db.getBansForRoom(server.id);

    return hasRoomBanForUser(bans, currentUser, currentUserId);
  }

  private resetCreateForm(): void {
    this.newServerName.set('');
    this.newServerDescription.set('');
    this.newServerTopic.set('');
    this.newServerPrivate.set(false);
    this.newServerPassword.set('');
    this.newServerSourceId = this.activeEndpoints()[0]?.id ?? '';
  }
}