package email

import (
	"encoding/json"
	"errors"
	"fmt"
	"git.selly.red/Selly-Modules/natsio"
)

func getPrefixEmailService(subject string) string {
	return fmt.Sprintf("selly.email.%s", subject)
}

const (
	SubjectSendEmail = "send_email"
)

const (
	KeyCreateSupplierUser = "create_supplier_user"
)

var (
	c *Client
)

// GetEmail ...
func GetEmail() *Client {
	return c
}

// Client ...
type Client struct {
	Config        Config
	natsServer    natsio.Server
	natsJetStream natsio.JetStream
}

// NewClient ...
func NewClient(cfg Config) (*Client, error) {
	if cfg.Nats.URL == "" {
		return nil, errors.New("nats url is required")
	}
	if err := natsio.Connect(cfg.Nats); err != nil {
		return nil, fmt.Errorf("nats connect failed: %v", err)
	}

	c = &Client{
		Config:        cfg,
		natsServer:    natsio.GetServer(),
		natsJetStream: natsio.GetJetStream(),
	}

	return c, nil
}

func (c *Client) Send(payload SendPayload) (requestID string, err error) {
	msg, err := c.natsServer.Request(getPrefixEmailService(SubjectSendEmail), toBytes(payload))
	if err != nil {
		return "", err
	}
	var res struct {
		Data  Response `json:"data"`
		Error string   `json:"error"`
	}
	if err = json.Unmarshal(msg.Data, &res); err != nil {
		return "", err
	}
	if res.Error != "" {
		return "", errors.New(res.Error)
	}
	return res.Data.RequestID, nil
}

func toBytes(data interface{}) []byte {
	b, _ := json.Marshal(data)
	return b
}