package com.evseminar.exception;

import com.evseminar.dto.ApiResponse;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

import java.util.stream.Collectors;

@RestControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(BadRequestException.class)
    public ResponseEntity<ApiResponse> handleBadRequest(BadRequestException ex) {
        return ResponseEntity.badRequest().body(ApiResponse.error(ex.getMessage()));
    }

    @ExceptionHandler(ResourceNotFoundException.class)
    public ResponseEntity<ApiResponse> handleNotFound(ResourceNotFoundException ex) {
        return ResponseEntity.status(HttpStatus.NOT_FOUND).body(ApiResponse.error(ex.getMessage()));
    }

    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity<ApiResponse> handleValidation(MethodArgumentNotValidException ex) {
        String errors = ex.getBindingResult().getFieldErrors().stream()
                .map(FieldError::getDefaultMessage)
                .collect(Collectors.joining(", "));
        return ResponseEntity.badRequest().body(ApiResponse.error(errors));
    }

    @ExceptionHandler(Exception.class)
    public ResponseEntity<ApiResponse> handleGeneral(Exception ex) {
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
                .body(ApiResponse.error("Internal server error: " + ex.getMessage()));
    }
}