import { Prisma } from '../../generated/prisma';

/** What of an error may go into the log. */
export interface LoggableError {
  message: string;
  stack: string | undefined;
}

const PRISMA_ERRORS = [
  Prisma.PrismaClientKnownRequestError,
  Prisma.PrismaClientUnknownRequestError,
  Prisma.PrismaClientRustPanicError,
  Prisma.PrismaClientInitializationError,
  Prisma.PrismaClientValidationError,
];

function isPrismaError(error: unknown): error is Error {
  return PRISMA_ERRORS.some((type) => error instanceof type);
}

function modelName(meta: Record<string, unknown> | undefined): string | null {
  return typeof meta?.modelName === 'string' ? meta.modelName : null;
}

/**
 * Prisma error messages quote the failing query - titles, descriptions,
 * names, i.e. personal data - and so does the stack, whose first line is
 * the message. A Prisma error is therefore logged by name, error code and
 * model only. Any other error keeps message and stack for diagnosis.
 */
export function loggableError(error: unknown): LoggableError {
  if (error instanceof Prisma.PrismaClientKnownRequestError) {
    const model = modelName(error.meta);
    return {
      message: `${error.name} ${error.code}${model ? ` (${model})` : ''}`,
      stack: undefined,
    };
  }
  if (isPrismaError(error)) {
    return { message: error.name, stack: undefined };
  }
  if (error instanceof Error) {
    return { message: error.message, stack: error.stack };
  }
  return { message: String(error), stack: undefined };
}