package business

import (
	"context"

	"github.com/go-kratos/kratos/v3/errors"
	"kra/internal/biz/system"
)

var (
	ErrUnauthenticated    = errors.Unauthorized("SW_UNAUTHENTICATED", "请先登录")
	ErrPreferenceRequired = errors.BadRequest("SW_PREFERENCE_REQUIRED", "偏好参数不能为空")
	ErrStorage            = errors.InternalServer("SW_STORAGE_ERROR", "商务数据访问失败")
)

// UserPreference 使用新用户 ID，保留旧商务两个全局开关的含义。
type UserPreference struct {
	IncludeSubPromote bool
	IDCardDedup       bool
}

type UserPreferenceRepo interface {
	Find(context.Context, uint) (*UserPreference, error)
	Save(context.Context, uint, UserPreference) error
}

type UserPreferenceUsecase struct{ repo UserPreferenceRepo }

func NewUserPreferenceUsecase(repo UserPreferenceRepo) *UserPreferenceUsecase {
	return &UserPreferenceUsecase{repo: repo}
}

func (uc *UserPreferenceUsecase) Current(ctx context.Context) (*UserPreference, error) {
	actor, ok := system.ActorFromContext(ctx)
	if !ok || actor.UserID == 0 {
		return nil, ErrUnauthenticated
	}
	return uc.ForUser(ctx, actor.UserID)
}

func (uc *UserPreferenceUsecase) ForUser(ctx context.Context, id uint) (*UserPreference, error) {
	if id == 0 {
		return nil, ErrUnauthenticated
	}
	pref, err := uc.repo.Find(ctx, id)
	if err != nil {
		return nil, err
	}
	if pref == nil {
		return &UserPreference{IncludeSubPromote: true, IDCardDedup: true}, nil
	}
	return pref, nil
}

func (uc *UserPreferenceUsecase) UpdateCurrent(ctx context.Context, pref UserPreference) error {
	actor, ok := system.ActorFromContext(ctx)
	if !ok || actor.UserID == 0 {
		return ErrUnauthenticated
	}
	return uc.repo.Save(ctx, actor.UserID, pref)
}