package systemconfig

import (
	"encoding/json"
	"errors"
)

var (
	ErrDependencyUnavailable = errors.New("dependency unavailable")
	ErrInvalidConfig         = errors.New("invalid config")
)

type Service struct {
	repo *Repository
}

func NewService(repo *Repository) *Service {
	return &Service{repo: repo}
}

func (s *Service) List() ([]ConfigDTO, error) {
	if s.repo == nil {
		return nil, ErrDependencyUnavailable
	}
	return s.repo.List()
}

func (s *Service) PublishOptions() (*PublishOptionsDTO, error) {
	if s.repo == nil {
		return nil, ErrDependencyUnavailable
	}
	value, err := s.repo.FindValue(publishOptionsConfigKey)
	if err != nil {
		return nil, err
	}
	options := DefaultPublishOptions()
	if err := json.Unmarshal([]byte(value), &options); err != nil {
		options = DefaultPublishOptions()
	}
	normalizePublishOptions(&options)
	return &options, nil
}

func (s *Service) Update(actorID uint64, key string, req UpdateRequest, meta AuditMeta) (*ConfigDTO, error) {
	if s.repo == nil {
		return nil, ErrDependencyUnavailable
	}
	if key == "" || req.Value == "" {
		return nil, ErrInvalidConfig
	}
	return s.repo.Update(actorID, key, req, meta)
}

func normalizePublishOptions(options *PublishOptionsDTO) {
	defaults := DefaultPublishOptions()
	if len(options.ServerOptions) == 0 {
		options.ServerOptions = defaults.ServerOptions
	}
	if len(options.FaceOptions) == 0 {
		options.FaceOptions = defaults.FaceOptions
	}
	if len(options.RankOptions) == 0 {
		options.RankOptions = defaults.RankOptions
	}
	if len(options.InsuranceOptions) == 0 {
		options.InsuranceOptions = defaults.InsuranceOptions
	}
	if len(options.LevelOptions) == 0 {
		options.LevelOptions = defaults.LevelOptions
	}
	if len(options.LoginMethodOptions) == 0 {
		options.LoginMethodOptions = defaults.LoginMethodOptions
	}
	if len(options.RegionOptions) == 0 {
		options.RegionOptions = defaults.RegionOptions
	}
	if len(options.SkinGroups) == 0 {
		options.SkinGroups = defaults.SkinGroups
	}
	if len(options.QuantityItems) == 0 {
		options.QuantityItems = defaults.QuantityItems
	}
	if len(options.ScreenshotSlots) == 0 {
		options.ScreenshotSlots = defaults.ScreenshotSlots
	}
}