import { Component, OnInit, OnDestroy } from '@angular/core';
import { CommonModule } from '@angular/common';
import { ActivatedRoute } from '@angular/router';
import { FormsModule } from '@angular/forms';
import { LucideAngularModule, Swords, Plus, Globe, Pencil, Trash2 } from 'lucide-angular';
import { Router, RouterLink } from '@angular/router';
import { forkJoin, of } from 'rxjs';
import { catchError, switchMap, filter, map } from 'rxjs/operators';
import { CampaignService } from '../../services/campaign.service';
import { LoreService } from '../../services/lore.service';
import { LayoutService, GlobalItem } from '../../services/layout.service';
import { PageTitleService } from '../../services/page-title.service';
import { Campaign, Arc } from '../../services/campaign.model';
import { Lore } from '../../services/lore.model';
import { loadCampaignTreeData, buildCampaignTree, CampaignTreeData } from '../campaign-tree.helper';

@Component({
  selector: 'app-campaign-detail',
  standalone: true,
  imports: [CommonModule, FormsModule, LucideAngularModule, RouterLink],
  templateUrl: './campaign-detail.component.html',
  styleUrls: ['./campaign-detail.component.scss']
})
export class CampaignDetailComponent implements OnInit, OnDestroy {
  readonly Swords = Swords;
  readonly Plus = Plus;
  readonly Globe = Globe;
  readonly Pencil = Pencil;
  readonly Trash2 = Trash2;

  campaign: Campaign | null = null;
  arcs: Arc[] = [];
  /** Lore associé si `campaign.loreId` est renseigné ; sinon null. */
  linkedLore: Lore | null = null;
  /** Lores disponibles pour changer l'association en mode édition. */
  availableLores: Lore[] = [];

  /** Mode édition inline. */
  editing = false;
  editName = '';
  editDescription = '';
  editLoreId = '';

  constructor(
    private route: ActivatedRoute,
    private router: Router,
    private campaignService: CampaignService,
    private loreService: LoreService,
    private layoutService: LayoutService,
    private pageTitleService: PageTitleService
  ) {}

  ngOnInit(): void {
    // switchMap annule automatiquement le load précédent si l'utilisateur
    // change de campagne avant que le forkJoin ne réponde — évite qu'une
    // réponse en retard écrase des données plus récentes (race condition).
    this.route.paramMap.pipe(
      map(pm => pm.get('id')),
      filter((id): id is string => !!id && id !== this.campaign?.id),
      switchMap(id => forkJoin({
        campaign: this.campaignService.getCampaignById(id),
        allCampaigns: this.campaignService.getAllCampaigns(),
        treeData: loadCampaignTreeData(this.campaignService, id).pipe(
          catchError(() => of({ arcs: [], chaptersByArc: {}, scenesByChapter: {} } as CampaignTreeData))
        )
      }))
    ).subscribe(({ campaign, allCampaigns, treeData }) => {
      this.campaign = campaign;
      this.editing = false;
      this.loadLinkedLore(campaign);
      this.arcs = treeData.arcs;
      this.showLayout(allCampaigns, treeData);
      this.pageTitleService.set(campaign.name);
    });
  }

  /**
   * Recharge explicitement après une mise à jour locale (ex: saveEdit).
   * Contrairement au flux ngOnInit, on bypass le filter sur l'ID puisqu'on
   * veut rafraîchir même si l'ID n'a pas changé.
   */
  private reload(id: string): void {
    forkJoin({
      campaign: this.campaignService.getCampaignById(id),
      allCampaigns: this.campaignService.getAllCampaigns(),
      treeData: loadCampaignTreeData(this.campaignService, id).pipe(
        catchError(() => of({ arcs: [], chaptersByArc: {}, scenesByChapter: {} } as CampaignTreeData))
      )
    }).subscribe(({ campaign, allCampaigns, treeData }) => {
      this.campaign = campaign;
      this.editing = false;
      this.loadLinkedLore(campaign);
      this.arcs = treeData.arcs;
      this.showLayout(allCampaigns, treeData);
      this.pageTitleService.set(campaign.name);
    });
  }

  /**
   * Charge le Lore associé (si loreId présent). On swallow l'erreur :
   * si le Lore a été supprimé entre-temps, on affiche simplement "Univers introuvable".
   */
  private loadLinkedLore(campaign: Campaign): void {
    if (!campaign.loreId) {
      this.linkedLore = null;
      return;
    }
    this.loreService.getLoreById(campaign.loreId).pipe(
      catchError(() => of(null))
    ).subscribe(lore => this.linkedLore = lore);
  }

  private showLayout(allCampaigns: Campaign[], data: CampaignTreeData): void {
    const campaignId = this.campaign!.id!;
    const globalItems: GlobalItem[] = allCampaigns.map(c => ({
      id: c.id!,
      name: c.name,
      route: `/campaigns/${c.id}`
    }));

    this.layoutService.show({
      title: this.campaign!.name,
      items: buildCampaignTree(campaignId, data),
      footerLabel: 'Toutes les campagnes',
      createActions: [
        { id: 'create-arc', label: '+ Nouvel arc', variant: 'primary', route: `/campaigns/${campaignId}/arcs/create` }
      ],
      globalItems,
      globalBackLabel: 'Toutes les campagnes',
      globalBackRoute: '/campaigns'
    });
  }

  // ─────────────── Édition / suppression de la Campagne ───────────────

  startEdit(): void {
    if (!this.campaign) return;
    this.editName = this.campaign.name;
    this.editDescription = this.campaign.description ?? '';
    this.editLoreId = this.campaign.loreId ?? '';
    // On charge les Lores disponibles pour le select uniquement à l'entrée en mode édition.
    this.loreService.getAllLores().subscribe({
      next: (lores) => this.availableLores = lores,
      error: () => this.availableLores = []
    });
    this.editing = true;
  }

  cancelEdit(): void {
    this.editing = false;
  }

  saveEdit(): void {
    if (!this.campaign || !this.editName.trim()) return;
    this.campaignService.updateCampaign(this.campaign.id!, {
      name: this.editName.trim(),
      description: this.editDescription,
      playerCount: this.campaign.playerCount ?? 0,
      loreId: this.editLoreId ? this.editLoreId : null
    }).subscribe({
      next: (updated) => {
        this.campaign = updated;
        this.editing = false;
        // Recharge pour actualiser le badge "Univers" et le titre sidebar.
        this.reload(updated.id!);
      },
      error: () => console.error('Erreur lors de la mise à jour de la campagne')
    });
  }

  /**
   * Suppression protégée : refus si la campagne contient des arcs.
   * Les arcs contiennent potentiellement des chapitres/scènes construits longuement.
   */
  deleteCampaign(): void {
    if (!this.campaign) return;
    if (this.arcs.length > 0) {
      alert(
        `Impossible de supprimer "${this.campaign.name}" : elle contient encore ${this.arcs.length} arc(s).\n` +
        `Videz la campagne (arcs et chapitres) avant de la supprimer.`
      );
      return;
    }
    if (!confirm(`Supprimer définitivement la campagne "${this.campaign.name}" ?`)) return;
    this.campaignService.deleteCampaign(this.campaign.id!).subscribe({
      next: () => this.router.navigate(['/campaigns']),
      error: () => console.error('Erreur lors de la suppression de la campagne')
    });
  }

  ngOnDestroy(): void {
    this.layoutService.hide();
  }
}