package org.simantics.document.server.request;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;

import org.simantics.db.layer0.exception.MissingVariableException;
import org.simantics.db.layer0.scl.SCLDatabaseException;
import org.simantics.document.server.DocumentException;
import org.simantics.scl.compiler.module.repository.ImportFailure;
import org.simantics.scl.compiler.module.repository.ImportFailureException;
import org.simantics.scl.compiler.top.NotFoundException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class NodeRequestUtils {
    private static final Logger LOGGER = LoggerFactory.getLogger(NodeRequestUtils.class);

	public static String formatErrorMessage(String name, Throwable t) {
		
		while(t.getCause() != null)
            t = t.getCause();
		
		if (t instanceof DocumentException) {
			return t.getMessage();
		} else if (t instanceof MissingVariableException) {
			return name + ":\n" +
					t.getMessage().replaceAll("(?m)^", "  ");
		} else if (t instanceof SCLDatabaseException) {
			StringBuilder sb = new StringBuilder();
			sb.append(name + ":\n");
			sb.append(t.getMessage().replaceAll("(?m)^", "  "));
			return sb.toString();
		} else if (t instanceof NotFoundException) {
			return t.getMessage();
		} else if (t instanceof ImportFailureException) {
			ImportFailureException e = (ImportFailureException)t;
			StringBuilder sb = new StringBuilder();
			sb.append("The following SCL modules failed to compile:\n");
			for(ImportFailure f : e.failures)
				sb.append(" " + f.moduleName + "\n");
			return sb.toString();
		} else {
		    LOGGER.error("Node request error:", t);
		    
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			PrintStream ps = new PrintStream(baos);
			t.printStackTrace(ps);
			try {
				return baos.toString("UTF-8");
			} catch (UnsupportedEncodingException e) {
				return baos.toString();
			}
			
		}
	}
	
}