import { Injectable } from "@nestjs/common";
import { PrismaService } from "../prisma/prisma.service.js";

// K-2/K-4 角色間關係：同作品角色互損、拆台、護短、吃醋等化學反應的資料來源。
// 有向邊：characterId 對 otherCharacterId 的觀感，兩邊可以各自設定、不必對稱。
@Injectable()
export class CharacterRelationshipService {
  constructor(private readonly prisma: PrismaService) {}

  async set(characterId: string, otherCharacterId: string, affinity: number, dynamic?: string) {
    return this.prisma.client.characterRelationship.upsert({
      where: { characterId_otherCharacterId: { characterId, otherCharacterId } },
      update: { affinity, dynamic },
      create: { characterId, otherCharacterId, affinity, dynamic },
    });
  }

  // 未設定關係時，回傳中性值（50）——同作品角色預設不特別親近也不特別有心結。
  async getAffinity(characterId: string, otherCharacterId: string): Promise<number> {
    const row = await this.prisma.client.characterRelationship.findUnique({
      where: { characterId_otherCharacterId: { characterId, otherCharacterId } },
    });
    return row?.affinity ?? 50;
  }
}