package smpp

import (
	"log"
	"smpp-otp/internal/config"

	"github.com/fiorix/go-smpp/smpp"
	"github.com/fiorix/go-smpp/smpp/pdu"
	"github.com/fiorix/go-smpp/smpp/pdu/pdutext"
)

type SMPPClient struct {
	Transceiver *smpp.Transceiver
}

func NewSMPPClient(cfg *config.Config) (*SMPPClient, error) {
	smppCfg := cfg.SMPP
	tx := &smpp.Transceiver{
		Addr:    smppCfg.Addr,
		User:    smppCfg.User,
		Passwd:  smppCfg.Pass,
		Handler: func(p pdu.Body) {},
	}

	connStatus := tx.Bind()
	status := <-connStatus
	if status.Status() != smpp.Connected {
		log.Println("Failed to connect:", status.Error())
		return nil, status.Error()
	}

	return &SMPPClient{Transceiver: tx}, nil
}

func (c *SMPPClient) SendSMS(cfg *config.Config, dest, text string) error {
	src := cfg.SMPP.Src_Phone_Number
	params := &smpp.ShortMessage{
		Src:      src,
		Dst:      dest,
		Text:     pdutext.Raw(text),
		Register: 0, // No delivery receipt
	}
	resp, err := c.Transceiver.Submit(params)
	if err != nil {
		log.Println("Failed to send SMS:", err)
		return err
	}

	log.Println("SMS sent successfully, response:", resp)
	return nil
}