import { Injectable } from "@nestjs/common";
import { PrismaService } from "../prisma/prisma.service.js";
import { ScheduleService } from "../schedule/schedule.service.js";
import { proactiveCareLine, bedtimeCareLine } from "./task-performance.js";
import { PROACTIVE_CARE_COOLDOWN_HOURS, TODO_SIGNAL_KEYWORDS, LATE_NIGHT_PATTERN_KEYWORDS } from "./constants.js";

const HOUR_MS = 60 * 60 * 1000;

// J-6 主動關照：從記憶偵測使用者提過的待辦、交叉比對作息型態，主動關心——但必須稀有且不重複台詞。
@Injectable()
export class ProactiveCareService {
  constructor(
    private readonly prisma: PrismaService,
    private readonly schedule: ScheduleService,
  ) {}

  async maybeGenerate(characterId: string, userId: string, now: Date = new Date()): Promise<string | null> {
    const lastLog = await this.prisma.client.proactiveCareLog.findFirst({
      where: { characterId, userId },
      orderBy: { triggeredAt: "desc" },
    });
    if (lastLog && now.getTime() - lastLog.triggeredAt.getTime() < PROACTIVE_CARE_COOLDOWN_HOURS * HOUR_MS) {
      return null;
    }

    const character = await this.prisma.client.character.findUniqueOrThrow({ where: { id: characterId } });
    const priorLogs = await this.prisma.client.proactiveCareLog.findMany({ where: { characterId, userId } });
    const usedMessages = new Set(priorLogs.map((log) => log.message));

    const todoMemories = await this.prisma.client.episodicMemory.findMany({
      where: {
        characterId,
        relatedUserId: userId,
        OR: TODO_SIGNAL_KEYWORDS.map((keyword) => ({ content: { contains: keyword } })),
      },
      orderBy: { occurredAt: "desc" },
    });
    for (const memory of todoMemories) {
      const line = proactiveCareLine(character.personalityArchetype, memory.content);
      if (!usedMessages.has(line)) {
        await this.log(characterId, userId, line, now);
        return line;
      }
    }

    // 交叉比對作息型態：使用者常提到熬夜，且目前正值睡前時段 → 主動叮嚀早點休息。
    const info = await this.schedule.getInfo(characterId, now);
    if (info.isPreSleep) {
      const lateNightMemory = await this.prisma.client.episodicMemory.findFirst({
        where: {
          characterId,
          relatedUserId: userId,
          OR: LATE_NIGHT_PATTERN_KEYWORDS.map((keyword) => ({ content: { contains: keyword } })),
        },
      });
      if (lateNightMemory) {
        const line = bedtimeCareLine(character.personalityArchetype);
        if (!usedMessages.has(line)) {
          await this.log(characterId, userId, line, now);
          return line;
        }
      }
    }

    return null;
  }

  private async log(characterId: string, userId: string, message: string, now: Date): Promise<void> {
    await this.prisma.client.proactiveCareLog.create({ data: { characterId, userId, message, triggeredAt: now } });
  }
}