wanijo2/src/main/kotlin/wanijo/wanijo2/domain/handler/NewDocumentCommandHandler.kt

package wanijo.wanijo2.domain.handler

import org.springframework.stereotype.Service
import wanijo.wanijo2.domain.Document
import wanijo.wanijo2.domain.DocumentDao
import wanijo.wanijo2.domain.DocumentTagging
import wanijo.wanijo2.domain.DocumentTaggingDao
import wanijo.wanijo2.domain.Tag
import wanijo.wanijo2.domain.TagDao
import wanijo.wanijo2.domain.event.NewDocumentCommand

@Service
class NewDocumentCommandHandler(
    val tagDao: TagDao,
    val documentDao: DocumentDao,
    val documentTaggingDao: DocumentTaggingDao
) {

    fun exec(event: NewDocumentCommand): Document {
        val document = documentDao.save(
            Document(
                name = event.name,
                description = event.description
            )
        )

        val tags = event.newTags
            .split(",")
            .map { it.trim() }
            .map { it to tagDao.findByName(it) }
            .map { (name, tag) ->
                if (tag == null) {
                    tagDao.save(Tag(name = name))
                } else {
                    tag
                }
            }

        val tagIdsToAttach = tags.map { it.id } + event.tagIds
        tagIdsToAttach.forEach {
            documentTaggingDao.save(
                DocumentTagging.between(document, it)
            )
        }

        return document
    }

}