package bind

import (
	"net/http"
)

const defaultMemory = 32 << 20

type (
	formBinding          struct{}
	formPostBinding      struct{}
	formMultipartBinding struct{}
)

func (formBinding) Name() string {
	return "form"
}

func (formBinding) Bind(req *http.Request, obj interface{}) error {
	if err := req.ParseForm(); err != nil {
		return err
	}
	if err := req.ParseMultipartForm(defaultMemory); err != nil {
		if err != http.ErrNotMultipart {
			return err
		}
	}
	return mapForm(obj, req.Form)
}

func (formPostBinding) Name() string {
	return "form-urlencoded"
}

func (formPostBinding) Bind(req *http.Request, obj interface{}) error {
	if err := req.ParseForm(); err != nil {
		return err
	}
	return mapForm(obj, req.PostForm)
}

func (formMultipartBinding) Name() string {
	return "multipart/form-data"
}

func (formMultipartBinding) Bind(req *http.Request, obj interface{}) error {
	if err := req.ParseMultipartForm(defaultMemory); err != nil {
		return err
	}
	return mappingByPtr(obj, (*multipartRequest)(req), "form")
}