import { ChangeDetectionStrategy, ChangeDetectorRef, Component, OnInit } from '@angular/core';
import { CommonModule } from '@angular/common';
import { MatCardModule } from '@angular/material/card';
import { MatIconModule } from '@angular/material/icon';
import { MatButtonModule } from '@angular/material/button';
import { MatAutocompleteModule } from '@angular/material/autocomplete';
import { MatInputModule } from '@angular/material/input';
import { MatFormFieldModule } from '@angular/material/form-field';
import { FormControl, ReactiveFormsModule } from '@angular/forms';
import { PokemonService } from '../../../core/services/pokemon.service';
import { Pokemon } from '../../../core/models/pokemon.model';
import { PokemonCellComponent } from '../pokemon-cell/pokemon-cell.component';
import { PokemonDetailsComponent } from '../pokemon-details/pokemon-details.component';
import { map, startWith } from 'rxjs/operators';
import { Observable } from 'rxjs';

interface PokemonSearchResult {
  pokemon: Pokemon;
  boxNumber: number;
}

@Component({
  selector: 'app-pokemon-carousel',
  standalone: true,
  imports: [
    CommonModule,
    MatCardModule,
    MatIconModule,
    MatButtonModule,
    MatAutocompleteModule,
    MatInputModule,
    MatFormFieldModule,
    ReactiveFormsModule,
    PokemonCellComponent,
    PokemonDetailsComponent
  ],
  template: `
    <div class="search-container">
      <mat-form-field appearance="fill" class="search-field">
        <mat-label>Search Pokémon</mat-label>
        <input type="text"
               matInput
               [formControl]="searchControl"
               [matAutocomplete]="auto">
        <mat-autocomplete #auto="matAutocomplete" 
                         (optionSelected)="onSearchSelect($event)"
                         [displayWith]="displayFn">
          <mat-option *ngFor="let result of filteredOptions | async" [value]="result">
            {{ result.pokemon.Name }}
            <span *ngIf="result.pokemon.Form">
              ({{ result.pokemon.Form }})
            </span>
            <span *ngIf="result.boxNumber !== undefined">
              (Box {{ result.boxNumber + 1 }})
            </span>
          </mat-option>
        </mat-autocomplete>
      </mat-form-field>
    </div>

    <div class="carousel-container">
      <button mat-icon-button class="nav-button prev" 
              [disabled]="currentBoxIndex === 0"
              (click)="previousBox()">
        <mat-icon>chevron_left</mat-icon>
      </button>

      <div class="pokemon-box-container">
        <mat-card class="pokemon-box">
          <div class="box-title">Box {{ (currentBoxIndex + 1).toString().padStart(3, '0') }}</div>
          <div class="pokemon-grid">
            <app-pokemon-cell
              *ngFor="let pokemon of currentGroup"
              [pokemon]="pokemon"
              (caught)="onPokemonCaught($event)"
              (selected)="onPokemonSelected($event)"
            ></app-pokemon-cell>
          </div>
        </mat-card>
      </div>

      <button mat-icon-button class="nav-button next" 
              [disabled]="currentBoxIndex === pokemonGroups.length - 1"
              (click)="nextBox()">
        <mat-icon>chevron_right</mat-icon>
      </button>
    </div>

    <div class="box-navigation">
      <span>Box {{ currentBoxIndex + 1 }} of {{ pokemonGroups.length }}</span>
    </div>
    
    <app-pokemon-details
      *ngIf="selectedPokemon"
      [pokemon]="selectedPokemon"
      [isOpen]="!!selectedPokemon"
      (closed)="selectedPokemon = null"
    ></app-pokemon-details>
  `,
  styles: [`
    .search-container {
      display: flex;
      justify-content: center;
    }

    .search-field {
      width: 100%;
      max-width: 400px;
    }
    .carousel-container {
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
      //height: calc(100vh - 200px);
      padding-top: 2em;
      padding-bottom: 2em;
    }

    .pokemon-box-container {
      flex: 1;
      max-width: 800px;
      position: relative;
    }

    .pokemon-box {
      background-color: white;
      border: 2px solid #ccc;
      border-radius: 10px;
      padding: 20px;
      position: relative;
      width: 100%;
      box-sizing: border-box;
    }

    .box-title {
      background-color: #4CAF50;
      color: white;
      padding: 5px 15px;
      border-radius: 15px 15px 0 0;
      position: absolute;
      top: -30px;
      left: 20px;
      font-weight: bold;
    }

    .pokemon-grid {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 10px;
    }

    .nav-button {
      margin: 0 20px;
      &.prev { left: 0; }
      &.next { right: 0; }
      &:disabled {
        opacity: 0.5;
      }
    }

    .box-navigation {
      text-align: center;
      padding: 10px;
      font-size: 1.1em;
      color: #666;
    }
  `],
  changeDetection: ChangeDetectionStrategy.OnPush
})
export class PokemonCarouselComponent implements OnInit {
  pokemonGroups: (Pokemon | null)[][] = [];
  currentBoxIndex = 0;
  selectedPokemon: Pokemon | null = null;
  caughtPokemon = new Set<string>();
  searchControl = new FormControl('');
  filteredOptions: Observable<PokemonSearchResult[]>;

  get currentGroup(): (Pokemon | null)[] {
    return this.pokemonGroups[this.currentBoxIndex] || [];
  }

  constructor(
    private pokemonService: PokemonService,
    private cdr: ChangeDetectorRef
  ) {
    this.filteredOptions = this.searchControl.valueChanges.pipe(
      startWith(''),
      map(value => this.filterPokemon(value))
    );
  }

  ngOnInit() {
    this.loadPokemon();
  }

  private loadPokemon() {
    this.pokemonService.getPokemonList().subscribe({
      next: (groups) => {
        this.pokemonGroups = groups;
        this.cdr.markForCheck();
      },
      error: (error) => {
        console.error('Error loading Pokemon:', error);
        this.cdr.markForCheck();
      }
    });
  }

  nextBox() {
    if (this.currentBoxIndex < this.pokemonGroups.length - 1) {
      this.currentBoxIndex++;
      this.cdr.markForCheck();
    }
  }

  previousBox() {
    if (this.currentBoxIndex > 0) {
      this.currentBoxIndex--;
      this.cdr.markForCheck();
    }
  }

  onPokemonCaught(pfic: string) {
    this.pokemonService.toggleCatch(pfic).subscribe(
      response => {
        if (response.status === 'caught') {
          this.caughtPokemon.add(pfic);
        } else {
          this.caughtPokemon.delete(pfic);
        }
        this.cdr.markForCheck();
      }
    );
  }

  onPokemonSelected(pokemon: Pokemon) {
    this.selectedPokemon = pokemon;
    this.cdr.markForCheck();
  }

  private filterPokemon(value: string | PokemonSearchResult | null): PokemonSearchResult[] {
    if (!value) return [];
    
    const searchTerm = typeof value === 'string' ? value.toLowerCase() : '';
    if (searchTerm.length < 2) return []; // Only search with 2 or more characters
    
    const results: PokemonSearchResult[] = [];
    
    this.pokemonGroups.forEach((group, boxIndex) => {
      group.forEach(pokemon => {
        if (pokemon && pokemon.Name.toLowerCase().includes(searchTerm)) {
          results.push({
            pokemon,
            boxNumber: boxIndex
          });
        }
      });
    });
    
    return results.slice(0, 10); // Limit to 10 results
  }

  displayFn(result: PokemonSearchResult): string {
    return result?.pokemon?.Name || '';
  }

  onSearchSelect(event: any) {
    const result: PokemonSearchResult = event.option.value;
    this.currentBoxIndex = result.boxNumber;
    this.searchControl.setValue('');
    this.cdr.markForCheck();
  }
}