feat(#168): API couples de garde parent (liste + couple courant).

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/routes/parents/parents.service.ts

@@ -5,7 +5,7 @@ import {
   NotFoundException,
 } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
-import { In, Repository } from 'typeorm';
+import { In, IsNull, Repository } from 'typeorm';
 import { Parents } from 'src/entities/parents.entity';
 import { DossierFamille } from 'src/entities/dossier_famille.entity';
 import { RoleType, Users } from 'src/entities/users.entity';
@@ -20,6 +20,8 @@ import {
 import { ParentsChildren } from 'src/entities/parents_children.entity';
 import { Children } from 'src/entities/children.entity';
 import { UpdateParentFicheAdminDto } from './dto/update-parent-fiche-admin.dto';
+import { AmChildren } from 'src/entities/am_children.entity';
+import { CouplesGardeResponseDto } from './dto/couples-garde.dto';
 
 @Injectable()
 export class ParentsService {
@@ -32,6 +34,8 @@ export class ParentsService {
     private readonly dossierFamilleRepository: Repository<DossierFamille>,
     @InjectRepository(ParentsChildren)
     private readonly parentsChildrenRepository: Repository<ParentsChildren>,
+    @InjectRepository(AmChildren)
+    private readonly amChildrenRepository: Repository<AmChildren>,
   ) {}
 
   // Création d’un parent
@@ -505,4 +509,108 @@ export class ParentsService {
     }
     return raw.map((r: { id: string }) => r.id);
   }
+
+  /**
+   * Liste les couples de garde (enfant ↔ AM) du parent connecté — ticket #168.
+   * Un couple = un placement actif dans enfants_assistantes_maternelles pour un enfant du parent.
+   */
+  async listerCouplesGarde(parentUserId: string): Promise<CouplesGardeResponseDto> {
+    const parent = await this.parentsRepository.findOne({
+      where: { user_id: parentUserId },
+    });
+    if (!parent) {
+      throw new NotFoundException('Parent introuvable');
+    }
+
+    const liensEnfants = await this.parentsChildrenRepository.find({
+      where: { parentId: parentUserId },
+      select: ['enfantId'],
+    });
+    const enfantIds = liensEnfants.map((l) => l.enfantId);
+    if (enfantIds.length === 0) {
+      return { couples: [], couple_courant_id: null };
+    }
+
+    const placements = await this.amChildrenRepository.find({
+      where: { enfantId: In(enfantIds), date_fin: IsNull() },
+      relations: ['child', 'am', 'am.user'],
+      order: { date_debut: 'ASC' },
+    });
+
+    let idCourant = parent.id_placement_garde_courant ?? null;
+    const idsValides = new Set(placements.map((p) => p.id));
+    if (idCourant && !idsValides.has(idCourant)) {
+      idCourant = null;
+      await this.parentsRepository.update(
+        { user_id: parentUserId },
+        { id_placement_garde_courant: null },
+      );
+    }
+    if (!idCourant && placements.length === 1) {
+      idCourant = placements[0].id;
+    }
+
+    const couples = placements.map((p) => {
+      const amUser = p.am?.user;
+      return {
+        id: p.id,
+        enfant: {
+          id: p.child.id,
+          prenom: p.child.first_name ?? null,
+          nom: p.child.last_name ?? null,
+          photo_url: p.child.photo_url ?? null,
+        },
+        am: {
+          id: p.amId,
+          prenom: amUser?.prenom ?? null,
+          nom: amUser?.nom ?? null,
+          photo_url: amUser?.photo_url ?? null,
+        },
+        courant: idCourant != null && p.id === idCourant,
+      };
+    });
+
+    return {
+      couples,
+      couple_courant_id: idCourant,
+    };
+  }
+
+  /**
+   * Persiste le couple de garde actif pour le parent — ticket #168.
+   */
+  async definirCoupleGardeCourant(
+    parentUserId: string,
+    coupleId: string,
+  ): Promise<CouplesGardeResponseDto> {
+    const parent = await this.parentsRepository.findOne({
+      where: { user_id: parentUserId },
+    });
+    if (!parent) {
+      throw new NotFoundException('Parent introuvable');
+    }
+
+    const placement = await this.amChildrenRepository.findOne({
+      where: { id: coupleId, date_fin: IsNull() },
+    });
+    if (!placement) {
+      throw new NotFoundException('Couple de garde introuvable ou inactif');
+    }
+
+    const lien = await this.parentsChildrenRepository.findOne({
+      where: { parentId: parentUserId, enfantId: placement.enfantId },
+    });
+    if (!lien) {
+      throw new BadRequestException(
+        'Ce couple ne concerne pas un enfant rattaché à ce parent',
+      );
+    }
+
+    await this.parentsRepository.update(
+      { user_id: parentUserId },
+      { id_placement_garde_courant: coupleId },
+    );
+
+    return this.listerCouplesGarde(parentUserId);
+  }
 }