package orm

import (
	"fmt"
	"net/http"
	"path"
	"reflect"
	"strings"

	"github.com/jinzhu/inflection"
)

var (
	getFns  map[string]func(args map[string]string) (interface{}, error)
	postFns map[string]func(args map[string]string, r *http.Request) (interface{}, error)
)

func init() {
	getFns = make(map[string]func(args map[string]string) (interface{}, error), 0)
}

func MapModels(models []interface{}, handlers map[string]string) {
	for _, model := range models {

		name := inflection.Plural(strings.ToLower(modelName(model)))

		for p, action := range map[string]string{
			"":            "GetAll",
			"create":      "Create",
			"{id}":        "Get",
			"{id}/udpate": "Update",
		} {
			getFns[path.Join("/", name, p)] = reflect.ValueOf(model).MethodByName(action).Interface().(func(map[string]string) (interface{}, error))
		}

		for p, action := range map[string]string{
			"{id}/udpate": "Update",
		} {
			getFns[path.Join("/", name, p)] = reflect.ValueOf(model).MethodByName(action).Interface().(func(map[string]string) (interface{}, error))
		}

	}
}

func GetFunc(path string) (GetFn, error) {
	fn, ok := getFns[path]
	if !ok {
		return nil, fmt.Errorf("Can't map path %s to any model methods.", path)
	}

	return fn, nil
}

// // func PostFunc(path string) (PostFn, error) {
// // 	fn, ok := Post[path]
// // 	if !ok {
// // 		return nil, fmt.Errorf("Can't map %s!", path)
// // 	}

// // 	return fn, nil
// // }

func GetNothing(args map[string]string) (interface{}, error) {
	return nil, nil
}

func PostNothing(args map[string]string, r *http.Request) (IDer, error) {
	return nil, nil
}

func modelName(s interface{}) string {
	if t := reflect.TypeOf(s); t.Kind() == reflect.Ptr {
		return t.Elem().Name()
	} else {
		return t.Name()
	}
}