package se.bilhalsning.exception;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import se.bilhalsning.dto.ErrorResponse;

@RestControllerAdvice
public class GlobalExceptionHandler {

    private static final Logger log = LoggerFactory.getLogger(GlobalExceptionHandler.class);

    @ExceptionHandler(InvalidCredentialsException.class)
    public ResponseEntity<ErrorResponse> handleInvalidCredentials(InvalidCredentialsException ex) {
        return ResponseEntity
                .status(HttpStatus.UNAUTHORIZED)
                .body(new ErrorResponse(ex.getMessage()));
    }

    @ExceptionHandler(EmailAlreadyExistsException.class)
    public ResponseEntity<ErrorResponse> handleEmailAlreadyExists(EmailAlreadyExistsException ex) {
        return ResponseEntity
                .status(HttpStatus.CONFLICT)
                .body(new ErrorResponse("E-postadressen är redan registrerad"));
    }

    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity<ErrorResponse> handleValidation(MethodArgumentNotValidException ex) {
        String message = ex.getBindingResult().getFieldErrors().stream()
                .map(e -> e.getField() + ": " + e.getDefaultMessage())
                .reduce((a, b) -> a + ", " + b)
                .orElse("Ogiltig indata");
        return ResponseEntity
                .badRequest()
                .body(new ErrorResponse(message));
    }

    @ExceptionHandler(Exception.class)
    public ResponseEntity<ErrorResponse> handleGeneral(Exception ex) {
        log.error("Unhandled exception", ex);
        return ResponseEntity
                .status(HttpStatus.INTERNAL_SERVER_ERROR)
                .body(new ErrorResponse("Ett internt fel uppstod"));
    }
}