package at.eisibaer.jbear2.service

import at.eisibaer.jbear2.dto.board.BoardDto
import at.eisibaer.jbear2.model.Board
import at.eisibaer.jbear2.model.User
import at.eisibaer.jbear2.repository.BoardRepository
import at.eisibaer.jbear2.repository.FileRepository
import at.eisibaer.jbear2.repository.UserRepository
import at.eisibaer.jbear2.service.mapper.BoardMapper
import org.slf4j.Logger
import org.slf4j.LoggerFactory
import org.springframework.http.HttpStatus
import org.springframework.http.ResponseEntity
import org.springframework.stereotype.Service
import org.springframework.transaction.annotation.Transactional
import org.springframework.web.multipart.MultipartFile

@Service
class BoardServiceImpl (
    private val fileService: FileService,
    private val boardRepository: BoardRepository,
    private val userRepository: UserRepository,
    private val fileRepository: FileRepository,
    private val boardMapper: BoardMapper,
) : BoardService {

    val log: Logger = LoggerFactory.getLogger(BoardServiceImpl::class.java)

    @Transactional
    override fun getBoardsByUser(user: User): ResponseEntity<List<BoardDto>?> {
        val boards =  boardRepository.findAllByOwner(user)
        return ResponseEntity.ok(boardMapper.toDto(boards))

    }

    @Transactional
    override fun getBoardByUserAndId(user: User, boardId: Long): ResponseEntity<BoardDto?> {
        val board = boardRepository.findByIdAndOwner(boardId, user) ?: return ResponseEntity.status(404).build()

        return ResponseEntity.ok(boardMapper.toDto(board))
    }

    @Transactional
    override fun saveBoardToUser( user: User, boardDto: BoardDto, files: List<MultipartFile>): ResponseEntity<BoardDto> {
        val board = if( boardDto.id == null ){
            Board(owner = user)
        } else {
            boardRepository.findByIdAndOwner(boardDto.id, user) ?: throw NoSuchElementException("Board not found for user " + user.username)
        }
        boardMapper.mapToEntity(board, boardDto, user, userRepository, fileRepository)

        val savedBoard: Board
        try {
            savedBoard = boardRepository.save(board)
        } catch (ex: Exception) {
            log.error(ex.message, ex)
            return ResponseEntity.badRequest().build()
        }

        try{
            fileService.saveFiles(files, user, savedBoard)
        } catch (ex: Exception) {
            log.error(ex.message, ex)
            return ResponseEntity.badRequest().build()
        }

        return ResponseEntity.ok(boardMapper.toDto(savedBoard))
    }

    override fun deleteBoardOfUser(user: User, boardId: Long): ResponseEntity<Unit> {
        val board = boardRepository.findByIdAndOwner(boardId, user) ?: return ResponseEntity.status(HttpStatus.NOT_FOUND).build()


        boardRepository.deleteById( boardId )


        //TODO Delete Images

        return ResponseEntity.ok().build()
    }

    private fun deleteFilesOfBoard(board: Board) {
        try {
            for (category in board.categories) {
                for (boardEntry in category.boardEntries) {
                    if (boardEntry.answer != null && boardEntry.answer!!.image != null) {
                        fileService.deleteFile(boardEntry.answer!!.image!!)
                    }
                    for (question in boardEntry.questions) {
                        if (question.image != null) {
                            fileService.deleteFile(question.image!!)
                        }
                    }
                }
            }
        } catch (exception: Exception) {
            log.error("Error occured",exception) //TODO
        }
    }
}