moving handlers into service. adding website

internal/service/currency.go

@@ -3,12 +3,51 @@ package service
 import (
 	"Portifolio/internal/model"
 	"database/sql"
+	"encoding/json"
+	"net/http"
 
 	_ "github.com/mattn/go-sqlite3"
 )
 
-func InsertCurrency(db *sql.DB, input model.CurrencyInput) (int, error) {
-	res, err := db.Exec(
+type Service struct {
+	db *sql.DB
+}
+
+func (s *Service) AddCurrencyHandler() http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		var input model.CurrencyInput
+		if err := json.NewDecoder(r.Body).Decode(&input); err != nil {
+			http.Error(w, "invalid json", http.StatusBadRequest)
+			return
+		}
+
+		id, err := s.InsertCurrency(input)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(http.StatusCreated)
+		json.NewEncoder(w).Encode(map[string]any{"status": "created", "id": id})
+	}
+}
+
+func (s *Service) GetCurrenciesHandler() http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		currencies, err := s.GetAllCurrencies()
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(currencies)
+	}
+}
+
+func (s *Service) InsertCurrency(input model.CurrencyInput) (int, error) {
+	res, err := s.db.Exec(
 		`INSERT INTO currencies (code, name) VALUES (?, ?)`,
 		input.Code, input.Name,
 	)
@@ -19,9 +58,9 @@ func InsertCurrency(db *sql.DB, input model.CurrencyInput) (int, error) {
 	return int(id), err
 }
 
-func GetCurrencyByCode(db *sql.DB, code string) (*model.Currency, error) {
+func (s *Service) GetCurrencyByCode(code string) (*model.Currency, error) {
 	c := &model.Currency{}
-	err := db.QueryRow(
+	err := s.db.QueryRow(
 		`SELECT id, code, name FROM currencies WHERE code = ?`, code,
 	).Scan(&c.ID, &c.Code, &c.Name)
 	if err == sql.ErrNoRows {
@@ -30,8 +69,8 @@ func GetCurrencyByCode(db *sql.DB, code string) (*model.Currency, error) {
 	return c, err
 }
 
-func GetAllCurrencies(db *sql.DB) ([]model.Currency, error) {
-	rows, err := db.Query(`SELECT id, code, name FROM currencies ORDER BY code`)
+func (s *Service) GetAllCurrencies() ([]model.Currency, error) {
+	rows, err := s.db.Query(`SELECT id, code, name FROM currencies ORDER BY code`)
 	if err != nil {
 		return nil, err
 	}