package util

import (
	"github.com/labstack/echo/v4"
	"sorbet/pkg/rsp"
)

// RequestGuarder 参数守卫函数签名
type RequestGuarder[T any] func(c echo.Context, req *T) error

// Bind 将提交的参数绑定到泛型 T 的实例上
func Bind[T any](c echo.Context, guards ...RequestGuarder[T]) (*T, error) {
	var req T
	if err := c.Bind(&req); err != nil {
		return nil, err
	}
	if err := c.Validate(&req); err != nil {
		return nil, err
	}
	for _, guard := range guards {
		if err := guard(c, &req); err != nil {
			return nil, err
		}
	}
	return &req, nil
}

func BindId(c echo.Context, must bool) (uint, error) {
	request, err := Bind[struct {
		ID uint `json:"id" xml:"id" path:"id"`
	}](c)
	if err != nil {
		return 0, err
	}
	if must {
		if request.ID <= 0 {
			return 0, rsp.ErrBadParams
		}
	} else if request.ID < 0 {
		return 0, rsp.ErrBadParams
	}
	return request.ID, err
}