/**
 * Auto-Absent Timer Service
 * Vérifie toutes les 30 secondes les patients en statut "called" depuis plus de N minutes.
 * Si autoAbsentMinutes > 0 pour le cabinet, le patient est marqué absent et le suivant est appelé.
 */
import { getDb } from "../db.js";
import { clinics, queueEntries } from "../schema.js";
import { eq, and, inArray } from "drizzle-orm";
import { childLogger } from "../_core/logger.js";

const log = childLogger("auto-absent");
// Socket.io helpers (utilise le global injecté par le serveur principal)
function emitToClinic(clinicId: number, event: string, data: unknown) {
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  const io = (global as any).__socketIo;
  if (io) io.to(`clinic:${clinicId}`).emit(event, data);
}

function emitToPatient(patientToken: string, event: string, data: unknown) {
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  const io = (global as any).__socketIo;
  if (io) io.to(`patient:${patientToken}`).emit(event, data);
}

let intervalId: ReturnType<typeof setInterval> | null = null;

/** Démarre le job de vérification des absents automatiques */
export function startAutoAbsentJob(): void {
  if (intervalId) return; // already running
  intervalId = setInterval(checkAutoAbsent, 30_000);
  log.info("job started (interval 30s)");
}

/** Arrête le job */
export function stopAutoAbsentJob(): void {
  if (intervalId) {
    clearInterval(intervalId);
    intervalId = null;
    log.info("job stopped");
  }
}

async function checkAutoAbsent(): Promise<void> {
  const db = await getDb();
  if (!db) return;

  try {
    // Récupérer tous les cabinets avec autoAbsentMinutes > 0
    const activeClinics = await db
      .select({
        id: clinics.id,
        autoAbsentMinutes: clinics.autoAbsentMinutes,
        avgConsultationMinutes: clinics.avgConsultationMinutes,
        name: clinics.name,
      })
      .from(clinics)
      .where(and(
        eq(clinics.isActive, true),
        eq(clinics.isQueueOpen, true),
      ));

    const clinicsWithTimer = activeClinics.filter(
      (c) => (c.autoAbsentMinutes ?? 0) > 0
    );

    if (clinicsWithTimer.length === 0) return;

    const now = new Date();

    for (const clinic of clinicsWithTimer) {
      const thresholdMs = (clinic.autoAbsentMinutes ?? 3) * 60 * 1000;

      // Récupérer les patients en statut "called" pour ce cabinet
      const calledEntries = await db
        .select()
        .from(queueEntries)
        .where(and(
          eq(queueEntries.clinicId, clinic.id),
          eq(queueEntries.status, "called"),
        ));

      for (const entry of calledEntries) {
        if (!entry.calledAt) continue;
        const elapsed = now.getTime() - entry.calledAt.getTime();

        if (elapsed >= thresholdMs) {
          // Marquer absent
          await db
            .update(queueEntries)
            .set({ status: "absent" })
            .where(eq(queueEntries.id, entry.id));

          log.info(
            {
              clinicId: clinic.id,
              ticketNumber: entry.ticketNumber,
              elapsedMinutes: Math.round(elapsed / 60000),
            },
            "patient marked absent"
          );

          // Notifier le patient (s'il est encore connecté)
          if (entry.patientToken) {
            emitToPatient(entry.patientToken, "patient:auto_absent", {
              ticketNumber: entry.ticketNumber,
              message: `Votre ticket n°${entry.ticketNumber} a été annulé car vous n'étiez pas présent.`,
            });
          }

          // Reordonner la file et notifier le cabinet
          await reorderAndNotify(clinic.id, db);
        }
      }
    }
  } catch (err) {
    log.error({ err }, "check failed");
  }
}

async function reorderAndNotify(clinicId: number, db: Awaited<ReturnType<typeof getDb>>): Promise<void> {
  if (!db) return;

  // Récupérer les patients en attente pour ce cabinet
  const waitingEntries = await db
    .select()
    .from(queueEntries)
    .where(and(
      eq(queueEntries.clinicId, clinicId),
      eq(queueEntries.status, "waiting"),
    ));

  // Renuméroter
  let pos = 1;
  for (const e of waitingEntries.sort((a, b) => (a.position ?? 0) - (b.position ?? 0))) {
    await db
      .update(queueEntries)
      .set({ position: pos })
      .where(eq(queueEntries.id, e.id));
    pos++;
  }

  // Calculer l'état de la file pour la notification WebSocket
  const allActive = await db
    .select()
    .from(queueEntries)
    .where(and(
      eq(queueEntries.clinicId, clinicId),
      inArray(queueEntries.status, ["waiting", "called", "in_consultation"]),
    ));

  const state = {
    totalWaiting: allActive.filter((e) => e.status === "waiting").length,
    currentTicket: allActive.find((e) => e.status === "called")?.ticketNumber ?? null,
    clinicId,
  };

  emitToClinic(clinicId, "queue:update", state);
  emitToClinic(clinicId, "display:update", state);
}