import { serve } from "https://deno.land/std@0.168.0/http/server.ts";
import { externalRest } from "../../lib/externalSupabase.ts";
import { mydb } from "../../lib/mySupabase.ts";
import { corsHeaders, jsonResponse, errorResponse } from "../../lib/utils.ts";
import { validateAuth, hasPermission } from "../../lib/auth.ts";

/**
 * POST /appointments/reschedule
 * Reagendamento inteligente de consulta
 * 
 * Body:
 * {
 *   appointment_id: uuid,
 *   new_datetime?: string,
 *   reason: string,
 *   auto_suggest?: boolean
 * }
 * 
 * Returns:
 * {
 *   success: boolean,
 *   appointment_id: uuid,
 *   new_datetime: string,
 *   notification_sent: boolean
 * }
 */

serve(async (req) => {
  if (req.method === "OPTIONS") {
    return new Response("ok", { headers: corsHeaders() });
  }

  try {
    const auth = await validateAuth(req);
    if (!auth) {
      return errorResponse("Não autorizado", 401);
    }

    if (req.method !== "POST") {
      return errorResponse("Method not allowed", 405);
    }

    const body = await req.json();
    const { appointment_id, new_datetime, reason, auto_suggest } = body;

    // Buscar agendamento original
    const appRes = await externalRest(
      `/rest/v1/appointments?id=eq.${appointment_id}`,
      "GET"
    );

    if (appRes.status >= 400 || !appRes.data?.[0]) {
      return errorResponse("Agendamento não encontrado", 404);
    }

    const appointment = appRes.data[0];

    // Verificar permissão (paciente ou staff)
    if (appointment.patient_id !== auth.userId && !hasPermission(auth.role, ["admin", "secretary"])) {
      return errorResponse("Sem permissão", 403);
    }

    // Validar regras de reagendamento
    const rulesRes = await mydb
      .from("reschedule_rules")
      .select("*")
      .eq("doctor_id", appointment.doctor_id);

    const rules = rulesRes.data?.[0];
    if (rules) {
      const minAdvanceHours = rules.min_advance_hours || 24;
      const appointmentTime = new Date(appointment.date + "T" + appointment.time);
      const hoursUntilAppointment = (appointmentTime.getTime() - Date.now()) / (1000 * 60 * 60);

      if (hoursUntilAppointment < minAdvanceHours) {
        return errorResponse(`Reagendamento precisa ser feito com ${minAdvanceHours}h de antecedência`, 400);
      }
    }

    // Se novo horário não fornecido e auto_suggest=true, sugerir automaticamente
    let finalDateTime = new_datetime;
    if (!finalDateTime && auto_suggest) {
      const availRes = await externalRest(
        `/rest/v1/doctor_availability?doctor_id=eq.${appointment.doctor_id}&active=eq.true`,
        "GET"
      );

      if (availRes.status >= 400 || !availRes.data?.[0]) {
        return errorResponse("Nenhuma disponibilidade encontrada", 400);
      }

      const nextAvailable = availRes.data[0];
      finalDateTime = `${nextAvailable.date}T${nextAvailable.start_time}`;
    }

    if (!finalDateTime) {
      return errorResponse("Novo horário ou auto_suggest necessário", 400);
    }

    // Atualizar appointment no Supabase externo
    const updateRes = await externalRest(
      `/rest/v1/appointments?id=eq.${appointment_id}`,
      "PATCH",
      {
        date: finalDateTime.split("T")[0],
        time: finalDateTime.split("T")[1],
        status: "rescheduled",
      }
    );

    if (updateRes.status >= 400) {
      return errorResponse("Falha ao reagendar", 500);
    }

    // Registrar histórico de alteração
    await mydb.from("appointment_history").insert({
      appointment_id,
      field_changed: "datetime",
      old_value: `${appointment.date}T${appointment.time}`,
      new_value: finalDateTime,
      changed_by: auth.userId,
      change_reason: reason,
    });

    // Registrar smart cancel log se aplicável
    await mydb.from("smart_cancel_log").insert({
      appointment_id,
      rule_matched: "intelligent_reschedule",
      auto_rescheduled: true,
      new_appointment_id: appointment_id,
    });

    // Criar notificação
    await mydb.from("notifications_queue").insert({
      type: "email",
      recipient_id: appointment.patient_id,
      recipient_email: appointment.patient_email || null,
      payload: {
        subject: "Consulta Reagendada",
        body: `Sua consulta foi reagendada para ${finalDateTime}`,
        appointment_id,
      },
      status: "pending",
    });

    // Audit log
    await mydb.from("audit_log").insert({
      user_id: auth.userId,
      action: "reschedule_appointment",
      target_type: "appointment",
      target_id: appointment_id,
      payload: { old_datetime: `${appointment.date}T${appointment.time}`, new_datetime: finalDateTime, reason },
    });

    return jsonResponse({
      success: true,
      appointment_id,
      new_datetime: finalDateTime,
      notification_sent: true,
    });
  } catch (error: unknown) {
    console.error("[reschedule]", error);
    const err = error as Error;
    return errorResponse(err.message, 500);
  }
});