package at.gv.egiz.pdfas.lib.impl;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import at.gv.egiz.pdfas.common.exceptions.ErrorConstants;
import at.gv.egiz.pdfas.common.exceptions.PDFASError;
import at.gv.egiz.pdfas.common.exceptions.PdfAsMOAException;
import at.gv.egiz.pdfas.common.exceptions.SLPdfAsException;
import at.gv.egiz.pdfas.lib.impl.status.OperationStatus;

public class ErrorExtractor implements ErrorConstants {

	private static final Logger logger = LoggerFactory
			.getLogger(ErrorExtractor.class);
	
	private static final int MAX_CAUSE_DEPTH = 30;

	private static PDFASError convertPdfAsError(Throwable e) {
		if (e instanceof SLPdfAsException) {
			SLPdfAsException ex = (SLPdfAsException) e;
			if (ex.getInfo() != null) {
				return new PDFASError(ex.getCode(), ex.getInfo(), e);
			} else {
				return new PDFASError(ex.getCode(), e);
			}
		} else if(e instanceof PdfAsMOAException) {
			PdfAsMOAException ex = (PdfAsMOAException) e;
			int code = -1;
			String errorInfo = ex.getErrorResponse();
			
			if(ex.getErrorCode() != null && !ex.getErrorCode().isEmpty()) {
				try {
					code = Integer.parseInt(ex.getErrorCode());
				} catch(NumberFormatException numfo) {
					logger.warn("Failed to convert MOA ErrorCode: " + ex.getErrorCode(), e);
				}
			}
			
			if (errorInfo != null) {
				return new PDFASError(code, errorInfo, e);
			} else {
				return new PDFASError(code, e);
			}
		}
		
		// TODO: Handle more exceptions

		return null;
	}

	public static PDFASError searchPdfAsError(Throwable e, OperationStatus status) {
		Throwable cur = e;
		PDFASError err = null;

		// Search PDFASError
		for (int i = 0; i < MAX_CAUSE_DEPTH; i++) {
			if (cur instanceof PDFASError) {
				err = (PDFASError) cur;
			}
			if (err != null) {
				break;
			}

			cur = cur.getCause();
			if (cur == null) {
				break;
			}
		}
		
		if(err != null) {
			
			if(status != null) {
				err.getProcessInformations().putAll(status.getMetaInformations());
			}
			
			return err;
		}
		
		cur = e;
		// Search other reasons
		for (int i = 0; i < MAX_CAUSE_DEPTH; i++) {

			if (cur == null) {
				break;
			}

			err = convertPdfAsError(cur);

			if (err != null) {
				break;
			}

			cur = cur.getCause();
		}

		if (err != null) {
			
			if(status != null) {
				err.getProcessInformations().putAll(status.getMetaInformations());
			}
			
			return err;
		}

		logger.info("Cannot extract correct failure code from: ", e);
		
		err =  new PDFASError(ERROR_GENERIC, e);
		
		if(status != null) {
			err.getProcessInformations().putAll(status.getMetaInformations());
		}
		
		return err;
	}
}