package com.lincfusion.udyamlinc.common;

import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.security.authentication.BadCredentialsException;
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;

/** Every failure leaves the service in the same envelope the UI already parses. */
@RestControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(ResourceNotFoundException.class)
    public ResponseEntity<ApiResponse<Void>> notFound(ResourceNotFoundException e) {
        return ResponseEntity.status(HttpStatus.NOT_FOUND).body(ApiResponse.fail(e.getMessage()));
    }

    @ExceptionHandler(BadCredentialsException.class)
    public ResponseEntity<ApiResponse<Void>> badCredentials(BadCredentialsException e) {
        return ResponseEntity.status(HttpStatus.UNAUTHORIZED).body(ApiResponse.fail(e.getMessage()));
    }

    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseEntity<ApiResponse<Void>> invalid(MethodArgumentNotValidException e) {
        String detail = e.getBindingResult().getFieldErrors().stream()
                .map(f -> f.getField() + " " + f.getDefaultMessage())
                .collect(Collectors.joining("; "));
        return ResponseEntity.badRequest().body(ApiResponse.fail(detail));
    }

    @ExceptionHandler(IllegalArgumentException.class)
    public ResponseEntity<ApiResponse<Void>> illegal(IllegalArgumentException e) {
        return ResponseEntity.badRequest().body(ApiResponse.fail(e.getMessage()));
    }

    @ExceptionHandler(Exception.class)
    public ResponseEntity<ApiResponse<Void>> unexpected(Exception e) {
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
                .body(ApiResponse.fail("Unexpected error: " + e.getMessage()));
    }
}