package effects

import (
	"encoding/json"
	"errors"
	lucifer3 "git.aiterp.net/lucifer3/server"
)

type serializedEffect struct {
	Manual   *Manual   `json:"manual,omitempty"`
	Gradient *Gradient `json:"gradient,omitempty"`
	Pattern  *Pattern  `json:"pattern,omitempty"`
	Random   *Random   `json:"random,omitempty"`
}

type Serializable struct {
	Effect lucifer3.Effect
}

func (s *Serializable) UnmarshalJSON(raw []byte) error {
	value := serializedEffect{}
	err := json.Unmarshal(raw, &value)
	if err != nil {
		return err
	}

	switch {
	case value.Manual != nil:
		s.Effect = *value.Manual
	case value.Gradient != nil:
		s.Effect = *value.Gradient
	case value.Pattern != nil:
		s.Effect = *value.Pattern
	case value.Random != nil:
		s.Effect = *value.Random
	default:
		return errors.New("unsupported effect")
	}

	return nil
}

func (s *Serializable) MarshalJSON() ([]byte, error) {
	switch effect := s.Effect.(type) {
	case Manual:
		return json.Marshal(serializedEffect{Manual: &effect})
	case Gradient:
		return json.Marshal(serializedEffect{Gradient: &effect})
	case Pattern:
		return json.Marshal(serializedEffect{Pattern: &effect})
	case Random:
		return json.Marshal(serializedEffect{Random: &effect})
	default:
		panic(s.Effect.EffectDescription() + "is not understood by serializer")
	}
}