package utils
import (
"encoding/json"
"fmt"
"io"
"math"
"os"
"slices"
"strconv"
)
func LoadItemsFromJson[T any](filePath *string) ([]T, *ServiceError) {
file, err := os.Open(*filePath)
if err != nil {
return nil, &ServiceError{HTTPStatus: 500, Message: err.Error()}
}
defer file.Close()
content, err := io.ReadAll(file)
if err != nil {
return nil, &ServiceError{HTTPStatus: 500, Message: err.Error()}
}
var items []T
json.Unmarshal(content, &items)
if items == nil {
return nil, &ServiceError{HTTPStatus: 500, Message: fmt.Sprintf("Fix the file %s to respect the expected schema", *filePath)}
}
return items, nil
}
func LoadItemfromJson[T any](filePath *string, predicate func(T) bool) (*T, *ServiceError) {
items, err := LoadItemsFromJson[T](filePath)
if err != nil {
return nil, err
}
// If this happens to be called lots of times and we know the file is not changed after starting the server,
// this can be optimized by creating a Map to search faster
idx := slices.IndexFunc(items, predicate)
if idx == -1 {
return nil, &ServiceError{HTTPStatus: 404, Message: Err404}
}
return &items[idx], nil
}
func ParseInt(raw *string) *int32 {
if raw == nil {
return nil
}
v, err := strconv.ParseInt(*raw, 0, 32)
if err != nil {
return nil
}
asInt32 := int32(v)
return &asInt32
}
func Ptr[T float64 | string](v T) *T {
return &v
}
func RoundToCloser(v float64) float64 {
return math.Round(v*100) / 100
}
