package pt.ist.struts.dispatch.action;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.io.IOUtils;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;
import org.apache.struts.actions.DispatchAction;

import pt.ist.fenixframework.DomainObject;
import pt.ist.fenixframework.pstm.AbstractDomainObject;

public abstract class BennuDispatchAction extends DispatchAction {
    protected static <T> T getAttribute(final HttpServletRequest request, final String attributeName) {
	final T t = (T) request.getAttribute(attributeName);
	return t == null ? (T) request.getParameter(attributeName) : t;
    }

    /**
     * use directly
     */
    @Deprecated
    protected static <T extends DomainObject> T getDomainObject(final String value) {
	return (T) AbstractDomainObject.fromExternalId(value);
    }

    protected static <T extends DomainObject> T getDomainObject(final HttpServletRequest request, final String attributeName) {
	String oid = request.getParameter(attributeName);
	if (oid == null || oid.length() == 0) {
	    // This workaround must remain until there is at least one oid being
	    // passed as a long and not its external String format.
	    Object attribute = request.getAttribute(attributeName);
	    if (attribute instanceof Long) {
		oid = attribute.toString();
	    } else {
		oid = (String) attribute;
	    }
	}
	return (T) AbstractDomainObject.fromExternalId(oid);
    }

    // protected <T extends Object> T getRenderedObject() {
    // final IViewState viewState = RenderUtils.getViewState();
    // return (T) getRenderedObject(viewState);
    // }
    //
    // protected <T extends Object> T getRenderedObject(final String id) {
    // final IViewState viewState = RenderUtils.getViewState(id);
    // return (T) getRenderedObject(viewState);
    // }
    //
    // protected <T extends Object> T getRenderedObject(final IViewState
    // viewState) {
    // if (viewState != null) {
    // MetaObject metaObject = viewState.getMetaObject();
    // if (metaObject != null) {
    // return (T) metaObject.getObject();
    // }
    // }
    // return null;
    // }

    protected static ActionForward download(final HttpServletResponse response, final String filename, final byte[] bytes,
	    final String contentType) throws IOException {
	try (OutputStream outputStream = response.getOutputStream()) {
	    if (contentType != null) {
		response.setContentType(contentType);
	    }
	    if (filename != null) {
		response.addHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(filename, "UTF-8"));
	    }
	    response.setContentLength(bytes.length);
	    outputStream.write(bytes);
	    return null;
	}
    }

    protected static ActionForward download(final HttpServletResponse response, final String filename, InputStream stream,
	    final String contentType) throws IOException {
	try (OutputStream outputStream = response.getOutputStream()) {
	    if (contentType != null) {
		response.setContentType(contentType);
	    }
	    if (filename != null) {
		response.addHeader("Content-Disposition", "attachment; filename=" + URLEncoder.encode(filename, "UTF-8"));
	    }
	    int byteCount = IOUtils.copy(stream, outputStream);
	    response.setContentLength(byteCount);
	    return null;
	}
    }

    protected byte[] consumeInputStream(final InputStream inputStream) throws IOException {
	return IOUtils.toByteArray(inputStream);
    }

    protected void addLocalizedMessage(final HttpServletRequest request, final String localizedMessage) {
	final ActionMessages messages = getMessages(request);
	ActionMessage actionMessage = new ActionMessage(localizedMessage, false);
	messages.add("message", actionMessage);
	saveMessages(request, messages);
    }

    protected void addLocalizedSuccessMessage(final HttpServletRequest request, final String localizedMessage) {
	final ActionMessages messages = getMessages(request);
	ActionMessage actionMessage = new ActionMessage(localizedMessage, false);
	messages.add("messageSuccess", actionMessage);
	saveMessages(request, messages);
    }

    protected void addLocalizedWarningMessage(final HttpServletRequest request, final String localizedMessage) {
	final ActionMessages messages = getMessages(request);
	ActionMessage actionMessage = new ActionMessage(localizedMessage, false);
	messages.add("messageWarning", actionMessage);
	saveMessages(request, messages);
    }

    protected void addMessage(final HttpServletRequest request, final String key, final String... args) {
	addMessage(request, "message", key, args);
    }

    protected void addMessage(final HttpServletRequest request, final String property, final String key, final String... args) {
	final ActionMessages messages = getMessages(request);
	messages.add(property, new ActionMessage(key, args));
	saveMessages(request, messages);
    }

    // protected ActionForward forwardToMuneConfiguration(final
    // HttpServletRequest request, final VirtualHost virtualHost,
    // final Node node) {
    // request.setAttribute("virtualHostToManageId",
    // virtualHost.getExternalId());
    // if (node != null) {
    // request.setAttribute("parentOfNodesToManageId", node.getExternalId());
    // }
    // return new ActionForward("/configuration.do?method=manageMenus");
    // }
    //
    //
    // protected ActionForward redirect(final HttpServletRequest request, final
    // String url) {
    // final String digest =
    // GenericChecksumRewriter.calculateChecksum(request.getContextPath() +
    // url);
    // final char seperator = url.indexOf('?') >= 0 ? '&' : '?';
    // final String urlWithChecksum = url + seperator +
    // GenericChecksumRewriter.CHECKSUM_ATTRIBUTE_NAME + '=' + digest;
    // return new ActionForward(urlWithChecksum, true);
    // }
    //
    // protected void displayConsistencyException(ConsistencyException exc,
    // HttpServletRequest request) {
    // if (exc.getLocalizedMessage() != null) {
    // addLocalizedMessage(request, exc.getLocalizedMessage());
    // } else {
    // exc.printStackTrace();
    // addLocalizedMessage(request,
    // BundleUtil.getStringFromResourceBundle("resources/MyorgResources",
    // "error.ConsistencyException"));
    // }
    // }

}