us-dop-bot/internal/application/message/message.go

package message

import (
	"fmt"
	"log/slog"
	"regexp"
	"strconv"
	"strings"
	"sync"

	tgbotapi "github.com/go-telegram-bot-api/telegram-bot-api/v5"
	"github.com/maximotejeda/us_dop_bot/internal/application/domain"
	"github.com/maximotejeda/us_dop_bot/internal/application/static"
	"github.com/maximotejeda/us_dop_bot/internal/ports"
)

var ChatPool *sync.Pool

type Message struct {
	bot    *tgbotapi.BotAPI
	update *tgbotapi.Update
	msg    *tgbotapi.MessageConfig
	log    *slog.Logger
	dolar  ports.DolarService
	user   ports.UserService
}

// NewMessage
// Factory for message handler
func NewMessage(bot *tgbotapi.BotAPI, update *tgbotapi.Update, dolar ports.DolarService, user ports.UserService) *Message {
	if ChatPool == nil {
		ChatPool = &sync.Pool{
			New: func() any { return &Message{} },
		}
		for i := 0; i < 20; i++ {
			ChatPool.Put(ChatPool.New())
		}
	}
	log := slog.Default()
	log = log.With("function", "message", "chat", update.Message.Chat.ID, "userid", update.Message.From.ID, "username", update.Message.From.UserName)
	message := ChatPool.Get().(*Message)
	message.update = update
	message.bot = bot
	message.log = log
	message.dolar = dolar
	message.user = user
	return message
}

// Empty
// Returns pointer to pool
func (m *Message) Empty() {
	m.update = nil
	m.msg = nil
	m.log = nil
	m.dolar = nil
	m.user = nil
	ChatPool.Put(m)
}

// Send
// Process message sending to bot
func (m *Message) Send() {
	defer m.Empty()
	m.bot.Send(m.msg)
}

// Handler
// Manage features for messages
func (m *Message) Handler() {
	msg := tgbotapi.NewMessage(m.update.Message.Chat.ID, "")
	m.msg = &msg
	msgtext := static.RemoveAccent(m.update.Message.Text)
	re := regexp.MustCompile(`(?P<operacion>([cC]omprar?\s?(me)?|[vV]en(de)?(r)?(ta)?\s?(me)?))\s(?P<cantidad>[0-9.]{1,8})\s(?P<moneda>(dolar(e)?(s)?|peso(s)?|dollars?))\s?(?P<institucion>(.*))?`)
	match := re.FindStringSubmatch(msgtext)
	if len(match) != 0 {
		operacion := match[1]
		operacion = strings.ToLower(operacion)
		cantidadStr := match[8]
		cantidad, err := strconv.ParseFloat(cantidadStr, 64)
		if err != nil {
			m.log.Error("converting to float cantidad", "error", err)
			m.msg.Text = "cantidad no reconocidad " + cantidadStr
			m.Send()
			return
		}
		moneda := match[9]
		moneda = strings.ToLower(moneda)
		institucion := match[14]
		institucion = strings.ToLower(institucion)
		switch {
		case strings.Contains(operacion, "compra"):
			txt := m.Compra(cantidad, moneda, institucion)
			m.msg.Text = txt
		case strings.Contains(operacion, "vend"):
			txt := m.Venta(cantidad, moneda, institucion)
			m.msg.Text = txt

		default:
			m.msg.Text = "operacion no reconocida"
		}

		m.Send()
	}
}

func (m *Message) Compra(cantidad float64, moneda, institucion string) string {
	txt := ""
	inst := static.NewInstList()
	list := []*domain.History{}
	if institucion == "" {
		brd, bp, bhd, bcd := m.getPrincipalBank()
		list = []*domain.History{brd, bp, bhd, bcd}
	} else {

		txtList := inst.GetName(institucion)
		if len(txtList) <= 0 {
			txt = "no institution with name " + institucion
			return txt
		} else {
			for _, v := range txtList {
				i, err := m.dolar.GetLatest(v.Name)
				if err != nil {
					m.log.Error("getting latest", "inst", v, "error", err)
					continue
				}
				list = append(list, i)
			}
		}
	}
	if strings.Contains(moneda, "peso") {
		txt = fmt.Sprintf("Comprando dolares \nRD.$ %.2f pesos:\n", cantidad)
		for _, it := range list {
			compra := cantidad / it.Venta
			txt = txt + fmt.Sprintf("        %s \t->\t     USD$. %.2f\n", inst.GetAbbrev(it.Institution.Name), compra)
		}
	} else if strings.Contains(moneda, "dol") {
		txt = fmt.Sprintf("Comprando %.2f dolares:\n", cantidad)
		for _, it := range list {
			compra := cantidad * it.Venta
			txt = txt + fmt.Sprintf("        %s \t->\t     RD$. %.2f\n", inst.GetAbbrev(it.Institution.Name), compra)
		}
	}

	return txt
}

func (m *Message) Venta(cantidad float64, moneda, institucion string) string {
	txt := ""
	list := []*domain.History{}

	inst := static.NewInstList()
	if institucion == "" {
		brd, bp, bhd, bcd := m.getPrincipalBank()
		list = []*domain.History{brd, bp, bhd, bcd}
	} else {
		txtList := inst.GetName(institucion)
		if len(txtList) <= 0 {
			txt = "no institution with name " + institucion
			return txt
		} else {
			for _, v := range txtList {
				i, err := m.dolar.GetLatest(v.Name)
				if err != nil {
					m.log.Error("getting latest", "inst", v, "error", err)
					continue
				}
				list = append(list, i)
			}
		}

	}
	if len(list) <= 0 {
		return "no institutions found with name " + institucion
	}
	if strings.Contains(moneda, "peso") {
		txt = fmt.Sprintf("Vendiendo equivalente a RD.$ %.2f pesos:\n", cantidad)
		for _, it := range list {
			venta := cantidad / it.Compra
			txt = txt + fmt.Sprintf("        %s \t->\t     USD$. %.2f\n", inst.GetAbbrev(it.Institution.Name), venta)
		}

	} else if strings.Contains(moneda, "dol") {
		txt = fmt.Sprintf("Vendiendo USD.$ %.2f dolares\n", cantidad)
		for _, it := range list {
			venta := cantidad * it.Compra
			txt = txt + fmt.Sprintf("        %s \t->\t     RD$. %.2f\n", inst.GetAbbrev(it.Institution.Name), venta)
		}

	}

	return txt
}

func (m *Message) getPrincipalBank() (brd, bp, bhd, bcd *domain.History) {
	// principales bancos
	// bhd reservas popular central
	brd, err := m.dolar.GetLatest("banreservas")
	if err != nil {
		m.log.Error("query latest for banreservas", "error", err)
	}
	bp, err = m.dolar.GetLatest("banco popular")
	if err != nil {
		m.log.Error("query latest for banco popular")
	}
	bhd, err = m.dolar.GetLatest("banco hipotecario dominicano")
	if err != nil {
		m.log.Error("query latest for banreservas")
	}
	bcd, err = m.dolar.GetLatest("banco central dominicano")
	if err != nil {
		m.log.Error("query latest for banreservas")
	}
	return brd, bp, bhd, bcd
}