package refactoring.struts;

import java.util.StringTokenizer;

import refactoring.struts.beans.SyntheticDispatchAction;

public class DispatchActionCreator {

    public static SyntheticDispatchAction createDispatchAction(String moduleName, String dispatchActionQualifiedName) {
	StringBuilder sourceCodeDA = new StringBuilder();

	sourceCodeDA.append(dispatchActionPackage(getModuleNameForQualifiedClassName(moduleName), dispatchActionQualifiedName));
	sourceCodeDA.append("\n");
	sourceCodeDA.append(classSignature(moduleName, dispatchActionQualifiedName));

	return new SyntheticDispatchAction(sourceCodeDA.toString(), qualifiedClassName(moduleName, dispatchActionQualifiedName));
    }

    private static String dispatchActionPackage(String moduleAdapted, String dispatchActionQualifiedName) {
	StringBuilder packageName = new StringBuilder();
	String packageWithoutClass = dispatchActionQualifiedName.substring(0, dispatchActionQualifiedName.lastIndexOf('.'));
	packageName.append("package " + packageWithoutClass + "." + moduleAdapted + ";" + "\n");

	return packageName.toString();
    }

    private static String classSignature(String moduleName, String dispatchActionQualifiedName) {
	StringBuilder classSignature = new StringBuilder();
	String classNameToExtend = dispatchActionQualifiedName.substring(dispatchActionQualifiedName.lastIndexOf('.') + 1);
	classSignature.append("public class " + classNameToExtend + "For" + getModuleNameForClassName(moduleName) + " extends "
		+ dispatchActionQualifiedName
		+ " {");
	classSignature.append("\n");
	classSignature.append("}");

	return classSignature.toString();
    }

    private static String qualifiedClassName(String moduleName, String dispatchActionQualifiedName) {
	StringBuilder qualifiedName = new StringBuilder();
	String classNameToExtend = dispatchActionQualifiedName.substring(dispatchActionQualifiedName.lastIndexOf('.') + 1);
	String packageWithoutClass = dispatchActionQualifiedName.substring(0, dispatchActionQualifiedName.lastIndexOf('.'));
	qualifiedName.append(packageWithoutClass + "." + getModuleNameForQualifiedClassName(moduleName) + "." + classNameToExtend
		+ "For" + getModuleNameForClassName(moduleName));

	return qualifiedName.toString();
    }

    private static String getModuleNameForClassName(String moduleName) {
	StringTokenizer tokenizer = new StringTokenizer(moduleName, "/");
	StringBuilder result = new StringBuilder();
	while (tokenizer.hasMoreTokens()) {
	    String token = tokenizer.nextToken();
	    token = ("" + token.charAt(0)).toUpperCase() + token.substring(1);
	    result.append(token);
	}

	return result.toString();
    }

    private static String getModuleNameForQualifiedClassName(String moduleName) {
	String name = moduleName;
	if (moduleName.startsWith("/")) {
	    name = name.substring(1);
	}
	return name.replace('/', '.');
    }

}