import { Component, OnInit, OnDestroy } from '@angular/core';

import { ReactiveFormsModule, FormBuilder, FormGroup, Validators } from '@angular/forms';
import { ActivatedRoute, Router } from '@angular/router';
import { forkJoin, of } from 'rxjs';
import { switchMap } from 'rxjs/operators';
import { LucideAngularModule, Trash2, Sparkles } from 'lucide-angular';
import { CampaignService } from '../../../services/campaign.service';
import { CharacterService } from '../../../services/character.service';
import { NpcService } from '../../../services/npc.service';
import { RandomTableService } from '../../../services/random-table.service';
import { PageService } from '../../../services/page.service';
import { LayoutService } from '../../../services/layout.service';
import { PageTitleService } from '../../../services/page-title.service';
import { Scene, SceneBranch, Room } from '../../../services/campaign.model';
import { Page } from '../../../services/page.model';
import { loadCampaignTreeData, buildCampaignSidebarConfig } from '../../campaign-tree.helper';
import { ExpandableSectionComponent } from '../../../shared/expandable-section/expandable-section.component';
import { LoreLinkPickerComponent } from '../../../shared/lore-link-picker/lore-link-picker.component';
import { AiChatDrawerComponent } from '../../../shared/ai-chat-drawer/ai-chat-drawer.component';
import { ImageGalleryComponent } from '../../../shared/image-gallery/image-gallery.component';
import { IconPickerComponent } from '../../../shared/icon-picker/icon-picker.component';
import { RoomsEditorComponent } from '../../../shared/rooms-editor/rooms-editor.component';
import { CAMPAIGN_ICON_OPTIONS } from '../../campaign-icons';
import { ConfirmDialogService } from '../../../shared/confirm-dialog/confirm-dialog.service';

/**
 * Écran de détail/modification d'une Scène.
 * Route : /campaigns/:campaignId/arcs/:arcId/chapters/:chapterId/scenes/:sceneId
 */
@Component({
    selector: 'app-scene-edit',
    imports: [ReactiveFormsModule, LucideAngularModule, ExpandableSectionComponent, LoreLinkPickerComponent, AiChatDrawerComponent, ImageGalleryComponent, IconPickerComponent, RoomsEditorComponent],
    templateUrl: './scene-edit.component.html',
    styleUrls: ['./scene-edit.component.scss']
})
export class SceneEditComponent implements OnInit, OnDestroy {
  readonly Trash2 = Trash2;
  readonly Sparkles = Sparkles;
  readonly campaignIconOptions = CAMPAIGN_ICON_OPTIONS;
  selectedIcon: string | null = null;

  /** État drawer chat IA (b5.7 — intégration Campagne). */
  chatOpen = false;
  readonly chatQuickSuggestions = [
    'Propose une ambiance sensorielle immersive pour cette scène',
    'Suggère une narration d\'ouverture à lire aux joueurs',
    'Imagine 2 choix avec conséquences marquantes'
  ];

  toggleChat(): void { this.chatOpen = !this.chatOpen; }

  form: FormGroup;
  campaignId = '';
  arcId = '';
  chapterId = '';
  sceneId = '';
  scene: Scene | null = null;

  availablePages: Page[] = [];
  loreId: string | null = null;
  relatedPageIds: string[] = [];
  illustrationImageIds: string[] = [];
  mapImageIds: string[] = [];

  /** Scènes du chapitre courant (hors scène éditée) — alimente le dropdown des cibles. */
  siblingScenes: Scene[] = [];
  /** Branches narratives (état local mutable, persisté au submit). */
  branches: SceneBranch[] = [];

  /** Pièces du lieu explorable (état local, persisté au submit). */
  rooms: Room[] = [];

  onRoomsChange(next: Room[]): void { this.rooms = next; }

  constructor(
    private fb: FormBuilder,
    private route: ActivatedRoute,
    private router: Router,
    private campaignService: CampaignService,
    private characterService: CharacterService,
    private npcService: NpcService,
    private randomTableService: RandomTableService,
    private pageService: PageService,
    private layoutService: LayoutService,
    private pageTitleService: PageTitleService,
    private confirmDialog: ConfirmDialogService
  ) {
    this.form = this.fb.group({
      name:                 ['', Validators.required],
      description:          [''],
      // Contexte et ambiance
      location:             [''],
      timing:               [''],
      atmosphere:           [''],
      // Narration
      playerNarration:      [''],
      // Secrets MJ
      gmSecretNotes:        [''],
      // Choix
      choicesConsequences:  [''],
      // Combat
      combatDifficulty:     [''],
      enemies:              ['']
    });
  }

  ngOnInit(): void {
    // On s'abonne à paramMap plutôt que de lire snapshot une fois : Angular
    // réutilise le composant quand on navigue entre scènes frères via l'arbre
    // (même route pattern), et ngOnInit ne se relance pas.
    this.route.paramMap.subscribe(pm => {
      const newCampaignId = pm.get('campaignId')!;
      const newArcId = pm.get('arcId')!;
      const newChapterId = pm.get('chapterId')!;
      const newSceneId = pm.get('sceneId')!;
      if (newSceneId !== this.sceneId ||
          newChapterId !== this.chapterId ||
          newArcId !== this.arcId ||
          newCampaignId !== this.campaignId) {
        this.campaignId = newCampaignId;
        this.arcId = newArcId;
        this.chapterId = newChapterId;
        this.sceneId = newSceneId;
        this.loadAll();
      }
    });
  }

  private loadAll(): void {
    forkJoin({
      campaign: this.campaignService.getCampaignById(this.campaignId),
      allCampaigns: this.campaignService.getAllCampaigns(),
      scene: this.campaignService.getSceneById(this.sceneId),
      chapterScenes: this.campaignService.getScenes(this.chapterId),
      treeData: loadCampaignTreeData(this.campaignService, this.campaignId, this.characterService, this.npcService, this.randomTableService)
    }).pipe(
      switchMap(data => {
        const lid = data.campaign.loreId ?? null;
        const pages$ = lid ? this.pageService.getByLoreId(lid) : of([] as Page[]);
        return pages$.pipe(switchMap(pages => of({ ...data, pages, loreId: lid })));
      })
    ).subscribe(({ campaign, allCampaigns, scene, chapterScenes, treeData, pages, loreId }) => {
      this.scene = scene;
      this.pageTitleService.set(scene.name);
      this.loreId = loreId;
      this.availablePages = pages;
      this.relatedPageIds = [...(scene.relatedPageIds ?? [])];
      this.selectedIcon = scene.icon ?? null;
      this.illustrationImageIds = [...(scene.illustrationImageIds ?? [])];
      this.mapImageIds = [...(scene.mapImageIds ?? [])];
      this.siblingScenes = chapterScenes.filter(s => s.id !== this.sceneId);
      this.branches = (scene.branches ?? []).map(b => ({ ...b }));
      this.rooms = (scene.rooms ?? []).map(r => ({ ...r, branches: [...(r.branches ?? [])] }));
      this.form.patchValue({
        name:                 scene.name,
        description:          scene.description ?? '',
        location:             scene.location ?? '',
        timing:               scene.timing ?? '',
        atmosphere:           scene.atmosphere ?? '',
        playerNarration:      scene.playerNarration ?? '',
        gmSecretNotes:        scene.gmSecretNotes ?? '',
        choicesConsequences:  scene.choicesConsequences ?? '',
        combatDifficulty:     scene.combatDifficulty ?? '',
        enemies:              scene.enemies ?? ''
      });

      this.layoutService.show(buildCampaignSidebarConfig(campaign, allCampaigns, treeData, this.campaignId));
    });
  }

  submit(): void {
    if (this.form.invalid || !this.scene) return;
    this.campaignService.updateScene(this.sceneId, {
      name:                 this.form.value.name,
      description:          this.form.value.description,
      chapterId:            this.chapterId,
      order:                this.scene.order ?? 1,
      location:             this.form.value.location,
      timing:               this.form.value.timing,
      atmosphere:           this.form.value.atmosphere,
      playerNarration:      this.form.value.playerNarration,
      gmSecretNotes:        this.form.value.gmSecretNotes,
      choicesConsequences:  this.form.value.choicesConsequences,
      combatDifficulty:     this.form.value.combatDifficulty,
      enemies:              this.form.value.enemies,
      relatedPageIds:       this.relatedPageIds,
      illustrationImageIds: this.illustrationImageIds,
      mapImageIds:          this.mapImageIds,
      branches:             this.branches,
      rooms:                this.rooms,
      icon:                 this.selectedIcon
    }).subscribe({
      next: () => this.router.navigate(['/campaigns', this.campaignId, 'arcs', this.arcId, 'chapters', this.chapterId, 'scenes', this.sceneId]),
      error: () => console.error('Erreur lors de la sauvegarde')
    });
  }

  delete(): void {
    this.confirmDialog.confirm({
      title: 'Supprimer la scène',
      message: `Supprimer la scène "${this.scene?.name}" ?`,
      details: ['Cette action est irréversible.'],
      confirmLabel: 'Supprimer',
      variant: 'danger'
    }).then(ok => {
      if (!ok) return;
      this.campaignService.deleteScene(this.sceneId).subscribe({
        next: () => this.router.navigate(['/campaigns', this.campaignId]),
        error: () => console.error('Erreur lors de la suppression')
      });
    });
  }

  cancel(): void {
    this.router.navigate(['/campaigns', this.campaignId, 'arcs', this.arcId, 'chapters', this.chapterId, 'scenes', this.sceneId]);
  }

  // ─────────────── Gestion des branches narratives ───────────────


  addBranch(): void {
    this.branches.push({ label: '', targetSceneId: '', condition: '' });
  }

  removeBranch(index: number): void {
    this.branches.splice(index, 1);
  }

  updateBranchLabel(index: number, value: string): void {
    this.branches[index].label = value;
  }

  updateBranchTarget(index: number, value: string): void {
    this.branches[index].targetSceneId = value;
  }

  updateBranchCondition(index: number, value: string): void {
    this.branches[index].condition = value;
  }

  ngOnDestroy(): void {
    // Volontairement vide : la sidebar reste prise en charge par le composant
    // suivant (autre sous-route ou le composant detail parent) qui appellera
    // show(). Eviter d'appeler hide() ici previent le clignotement / la
    // disparition de la sidebar lors des navigations internes a la section.
  }
}
