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package {{apiPackage}}

import org.springframework.context.annotation.Configuration
import org.springframework.http.HttpStatus
import org.springframework.web.bind.annotation.ControllerAdvice
import org.springframework.web.bind.annotation.ExceptionHandler
import {{javaxPackage}}.servlet.http.HttpServletResponse
import {{javaxPackage}}.validation.ConstraintViolationException

// TODO Extend ApiException for custom exception handling, e.g. the below NotFound exception
sealed class ApiException(msg: String, val code: Int) : Exception(msg)

class NotFoundException(msg: String, code: Int = HttpStatus.NOT_FOUND.value()) : ApiException(msg, code)

@Configuration("{{apiPackage}}.DefaultExceptionHandler")
@ControllerAdvice
class DefaultExceptionHandler {

    @ExceptionHandler(value = [ApiException::class])
    fun onApiException(ex: ApiException, response: HttpServletResponse): Unit =
        response.sendError(ex.code, ex.message)

    @ExceptionHandler(value = [NotImplementedError::class])
    fun onNotImplemented(ex: NotImplementedError, response: HttpServletResponse): Unit =
        response.sendError(HttpStatus.NOT_IMPLEMENTED.value())

    @ExceptionHandler(value = [ConstraintViolationException::class])
    fun onConstraintViolation(ex: ConstraintViolationException, response: HttpServletResponse): Unit =
        response.sendError(HttpStatus.BAD_REQUEST.value(), ex.constraintViolations.joinToString(", ") { it.message })
}