import { Injectable } from "@nestjs/common";
import type { EmotionTag } from "@kokorone/shared";
import { ScheduleService } from "./schedule.service.js";

export interface BaselineSignal {
  tag: EmotionTag;
  intensity: number;
}

const CLUB_TIRED_WINDOW_MINUTES = 30;

// I-5 作息驅動情緒基線：社團剛結束的疲憊、假日心情基線偏高等日內波動。
// 只在本輪對話「沒有明確情緒訊號」時介入，不覆蓋使用者輸入本身觸發的情緒。
@Injectable()
export class ScheduleEmotionBaselineService {
  constructor(private readonly schedule: ScheduleService) {}

  async computeBaseline(characterId: string, now: Date = new Date()): Promise<BaselineSignal | null> {
    const justEnded = await this.schedule.slotJustEnded(characterId, now, CLUB_TIRED_WINDOW_MINUTES);
    if (justEnded?.label?.includes("社團")) {
      return { tag: "SAD", intensity: 0.3 }; // 累
    }

    const dayType = await this.schedule.getDayType(characterId, now);
    if (dayType === "HOLIDAY" || dayType === "WEEKEND") {
      return { tag: "JOY", intensity: 0.3 }; // 放假日心情基線偏高
    }

    return null;
  }
}