package changekeys

import (
	"reflect"

	"git.aiterp.net/rpdata/api/models"
)

// One makes a ChangeKey for a model, or panics if it's not supported.
func One(object interface{}) models.ChangeKey {
	switch v := object.(type) {
	case models.Post:
		return models.ChangeKey{Model: "Post", ID: v.ID}
	case models.Character:
		return models.ChangeKey{Model: "Character", ID: v.ID}
	case models.Channel:
		return models.ChangeKey{Model: "Channel", ID: v.Name}
	}

	model := ""
	if t := reflect.TypeOf(object); t.Kind() == reflect.Ptr {
		model = t.Elem().Name()
	} else {
		model = t.Name()
	}

	id := ""
	v := reflect.ValueOf(object)
	for v.Kind() == reflect.Ptr {
		v = v.Elem()
	}

	if f := v.FieldByName("ID"); f.Kind() == reflect.String {
		id = f.String()
	} else if f = v.FieldByName("Name"); f.Kind() == reflect.String {
		id = f.String()
	} else {
		panic("Unsupported model")
	}

	return models.ChangeKey{Model: models.ChangeModel(model), ID: id}
}