package logic

import (
	"context"

	"spark-server/internal/module/upload/entity"
	"spark-server/internal/pkg/errs"
	"spark-server/internal/pkg/reqctx"
	"spark-server/internal/pkg/validate"
)

const maxCredentialBatch = 3

// BatchCreateInput issues up to three Presigned PUTs in one call (thumb / preview / orig).
type BatchCreateInput struct {
	Items []CreateInput `json:"items" validate:"required,min=1,max=3,dive" label:"field.upload_items" errmsg:"required:validate.upload.items_required;min:validate.upload.items_required;max:validate.upload.items_invalid"`
}

func (s *Service) CreateCredentials(ctx context.Context, userID int64, in *BatchCreateInput) (*entity.CredentialSet, error) {
	if !s.ready() {
		return nil, errs.ErrAvailable
	}
	if userID <= 0 {
		return nil, errs.ErrUnauthorized
	}
	if in == nil {
		return nil, errs.ErrInvalidArgument
	}
	if err := validate.StructLang(reqctx.Lang(ctx), in); err != nil {
		return nil, err
	}
	if n := len(in.Items); n < 1 || n > maxCredentialBatch {
		return nil, errs.ErrInvalidArgument
	}
	for range in.Items {
		if !s.allow(userID) {
			return nil, errs.ErrRateLimited
		}
	}
	items := make([]entity.Credential, 0, len(in.Items))
	for i := range in.Items {
		cred, err := s.issuePut(ctx, userID, &in.Items[i])
		if err != nil {
			return nil, err
		}
		items = append(items, *cred)
	}
	return &entity.CredentialSet{Items: items}, nil
}