import {AfterContentInit, Component} from '@angular/core';
import {GamesService} from "../../services/games.service";
import {DetectedGameDto} from "../../models/dtos/DetectedGameDto";
import {GenreDto} from "../../models/dtos/GenreDto";
import {ThemeDto} from "../../models/dtos/ThemeDto";
import {firstValueFrom, forkJoin, Observable} from "rxjs";
import {SortDirection} from "@angular/material/sort";
import {PlayerPerspectiveDto} from "../../models/dtos/PlayerPerspectiveDto";
import {ActivatedRoute, ActivatedRouteSnapshot, Params, Router} from "@angular/router";
import {Location} from "@angular/common";

class SortOption {
  title: string;
  field: string;
  direction: SortDirection;

  constructor(title: string, field: string, direction: SortDirection) {
    this.title = title;
    this.field = field;
    this.direction = direction;
  }
}

@Component({
  selector: 'app-gameserver-list',
  templateUrl: './library-overview.component.html',
  styleUrls: ['./library-overview.component.scss']
})
export class LibraryOverviewComponent implements AfterContentInit {

  defaultSortOption: SortOption = new SortOption("Title (A-Z)", "title", "asc");

  sortOptions: SortOption[] = [
    this.defaultSortOption,
    new SortOption("Title (Z-A)", "title", "desc"),

    new SortOption("Release (newest first)", "releaseDate", "desc"),
    new SortOption("Release (oldest first)", "releaseDate", "asc"),

    new SortOption("Added to library (newest first)", "addedToLibrary", "desc"),
    new SortOption("Added to library (oldest first)", "addedToLibrary", "asc"),

    new SortOption("Rating (highest first)", "totalRating", "desc"),
    new SortOption("Rating (lowest first)", "totalRating", "asc")
  ];

  searchTerm: string = "";
  selectedSortOption: SortOption = this.defaultSortOption;
  offlineCoopFilterEnabled: boolean = false;
  onlineCoopFilterEnabled: boolean = false;
  lanSupportFilterEnabled: boolean = false;
  activeThemeFilters: string[] = [];
  activeGenreFilters: string[] = [];
  activePlayerPerspectiveFilters: string[] = [];

  games: DetectedGameDto[] = [];
  availableGenres: GenreDto[] = [];
  availableThemes: ThemeDto[] = [];
  availablePlayerPerspectives: PlayerPerspectiveDto[] = [];

  loading: boolean = true;
  gameLibraryIsEmpty: boolean = false;
  private previousStateParams: Params = {};

  constructor(private gameServerService: GamesService,
              private route: ActivatedRoute,
              private router: Router,
              private location: Location) {
  }

  ngAfterContentInit(): void {
    this.gameServerService.getAllGames().subscribe(
      detectedGames => {
        if (detectedGames.length === 0) {
          this.gameLibraryIsEmpty = true;
          this.loading = false;
          return;
        }

        this.games = detectedGames;

        let genreObservable: Observable<ThemeDto[]> = this.gameServerService.getAvailableGenres();
        let themeObservable: Observable<GenreDto[]> = this.gameServerService.getAvailableThemes();
        let playerPerspectiveObservable: Observable<PlayerPerspectiveDto[]> = this.gameServerService.getAvailablePlayerPerspectives();

        forkJoin([genreObservable, themeObservable, playerPerspectiveObservable]).subscribe(result => {
          this.availableGenres = result[0];
          this.availableThemes = result[1];
          this.availablePlayerPerspectives = result[2];

          this.previousStateParams = this.route.snapshot.queryParams;
          if (this.previousStateParams['search'] !== undefined) this.searchTerm = this.previousStateParams['search'];
          if (this.previousStateParams['sort'] !== undefined) this.selectedSortOption = this.matchSelectedSortOptionFromParam(this.previousStateParams['sort']);
          if (this.previousStateParams['gamemodes'] !== undefined) this.setSelectedGamemodesFromParam(this.previousStateParams['gamemodes']);
          if (this.previousStateParams['genres'] !== undefined) this.activeGenreFilters = this.matchSelectedFilters(this.availableGenres, this.previousStateParams['genres']);
          if (this.previousStateParams['themes'] !== undefined) this.activeThemeFilters = this.matchSelectedFilters(this.availableThemes, this.previousStateParams['themes']);
          if (this.previousStateParams['playerPerspectives'] !== undefined) this.activePlayerPerspectiveFilters = this.matchSelectedFilters(this.availablePlayerPerspectives, this.previousStateParams['playerPerspectives']);

          this.refreshLibraryView().then(() => this.loading = false);
        });
      }
    );
  }

  async refreshLibraryView(): Promise<void> {
    let games: DetectedGameDto[] = await firstValueFrom(this.gameServerService.getAllGames());
    this.games = this.sortGames(this.filterGames(games));
    this.saveStateToRoute();
  }

  clearSearchTerm(): void {
    this.searchTerm = "";
    this.refreshLibraryView();
  }

  filterGames(games: DetectedGameDto[]): DetectedGameDto[] {
    if (this.searchTerm.trim().toLowerCase().length > 0) {
      games = games.filter(game => game.title.trim().toLowerCase().includes(this.searchTerm.trim().toLowerCase()));
    }

    if (this.offlineCoopFilterEnabled || this.onlineCoopFilterEnabled || this.lanSupportFilterEnabled) {
      games = games.filter(game => (game.offlineCoop === this.offlineCoopFilterEnabled || game.onlineCoop === this.onlineCoopFilterEnabled || game.lanSupport === this.lanSupportFilterEnabled));
    }

    if (this.activeGenreFilters.length > 0) {
      games = games.filter(game => this.activeGenreFilters.every(activeGenreFilter => game.genres?.map(g => g.slug).includes(activeGenreFilter)));
    }

    if (this.activeThemeFilters.length > 0) {
      games = games.filter(game => this.activeThemeFilters.every(activeThemeFilter => game.themes?.map(g => g.slug).includes(activeThemeFilter)));
    }

    if (this.activePlayerPerspectiveFilters.length > 0) {
      games = games.filter(game => this.activePlayerPerspectiveFilters.every(activePlayerPerspectiveFilter => game.playerPerspectives?.map(g => g.slug).includes(activePlayerPerspectiveFilter)));
    }

    return games;
  }

  sortGames(games: DetectedGameDto[]): DetectedGameDto[] {
    games = games.sort((g1, g2) => {
      // @ts-ignore
      let f1 = g1[this.selectedSortOption.field];
      // @ts-ignore
      let f2 = g2[this.selectedSortOption.field];

      if (f1 > f2) return 1;
      if (f1 < f2) return -1;
      return 0;
    });
    if (this.selectedSortOption.direction === "desc") games = games.reverse();
    return games;
  }

  toggleGenreFilter(slug: string): void {
    if (this.activeGenreFilters.includes(slug)) {

      const index = this.activeGenreFilters.indexOf(slug, 0);
      if (index > -1) {
        this.activeGenreFilters.splice(index, 1);
      }

    } else {
      this.activeGenreFilters.push(slug);
    }

    this.refreshLibraryView();
  }

  toggleThemeFilter(slug: string) {
    if (this.activeThemeFilters.includes(slug)) {

      const index = this.activeThemeFilters.indexOf(slug, 0);
      if (index > -1) {
        this.activeThemeFilters.splice(index, 1);
      }

    } else {
      this.activeThemeFilters.push(slug);
    }

    this.refreshLibraryView();
  }

  togglePlayerPerspectiveFilter(slug: string) {
    if (this.activePlayerPerspectiveFilters.includes(slug)) {

      const index = this.activePlayerPerspectiveFilters.indexOf(slug, 0);
      if (index > -1) {
        this.activePlayerPerspectiveFilters.splice(index, 1);
      }

    } else {
      this.activePlayerPerspectiveFilters.push(slug);
    }

    this.refreshLibraryView();
  }

  private saveStateToRoute(): void {
    let newStateParams: Params = {};

    if (this.searchTerm.trim().length > 0) newStateParams['search'] = this.searchTerm;
    if (this.selectedSortOption !== this.defaultSortOption) newStateParams['sort'] = LibraryOverviewComponent.toParam(this.selectedSortOption);
    if (this.getActiveGameModesFilters().length > 0) newStateParams['gamemodes'] = this.getActiveGameModesFilters().join(',');
    if (this.activeGenreFilters.length > 0) newStateParams['genres'] = this.activeGenreFilters.join(',');
    if (this.activeThemeFilters.length > 0) newStateParams['themes'] = this.activeThemeFilters.join(',');
    if (this.activePlayerPerspectiveFilters.length > 0) newStateParams['playerPerspectives'] = this.activePlayerPerspectiveFilters.join(',');

    // only update the route if it changed
    if (JSON.stringify(this.previousStateParams) !== JSON.stringify(newStateParams)) {
      const url = this.router.createUrlTree([], {relativeTo: this.route, queryParams: newStateParams}).toString();
      this.previousStateParams = newStateParams;
      this.location.go(url);
    }
  }

  private static toParam(sortOption: SortOption): string {
    return `${sortOption.field}_${sortOption.direction}`;
  }

  private matchSelectedSortOptionFromParam(sortParam: string): SortOption {
    return this.sortOptions.find(s => sortParam === LibraryOverviewComponent.toParam(s)) ?? this.defaultSortOption;
  }

  private matchSelectedFilters(options: any[], paramString: string): string[] {
    let params: string[] = paramString.split(",");
    return options.filter(o => params.includes(o.slug)).map(o => o.slug);
  }

  private getActiveGameModesFilters(): string[] {
    let activeFilters: string[] = [];

    if (this.offlineCoopFilterEnabled) activeFilters.push('offlineCoop');
    if (this.onlineCoopFilterEnabled) activeFilters.push('onlineCoop');
    if (this.lanSupportFilterEnabled) activeFilters.push('lanSupport');

    return activeFilters;
  }

  private setSelectedGamemodesFromParam(paramString: string): void {
    let params: string[] = paramString.split(",");

    if (params.includes('offlineCoop')) this.offlineCoopFilterEnabled = true;
    if (params.includes('onlineCoop')) this.onlineCoopFilterEnabled = true;
    if (params.includes('lanSupport')) this.lanSupportFilterEnabled = true;
  }

}