package httputil

import (
	"net/http"
	"reflect"

	"github.com/gin-gonic/gin"
)

// nilToEmpty converts nil slices to empty slices so JSON serializes as [] not null
func nilToEmpty(data interface{}) interface{} {
	if data == nil {
		return data
	}
	v := reflect.ValueOf(data)
	if v.Kind() == reflect.Slice && v.IsNil() {
		return reflect.MakeSlice(v.Type(), 0, 0).Interface()
	}
	return data
}

func OK(c *gin.Context, data interface{}) {
	c.JSON(http.StatusOK, gin.H{"data": nilToEmpty(data)})
}

func Created(c *gin.Context, data interface{}) {
	c.JSON(http.StatusCreated, gin.H{"data": nilToEmpty(data)})
}

func NoContent(c *gin.Context) {
	c.Status(http.StatusNoContent)
}

func BadRequest(c *gin.Context, err error) {
	c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
}

func Unauthorized(c *gin.Context) {
	c.JSON(http.StatusUnauthorized, gin.H{"error": "unauthorized"})
}

func NotFound(c *gin.Context) {
	c.JSON(http.StatusNotFound, gin.H{"error": "not found"})
}

func InternalError(c *gin.Context, err error) {
	c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
}