// This Source Code is in the Public Domain per: http://unlicense.org
package org.litesoft.util.template;

import org.litesoft.commonfoundation.base.*;

import java.io.*;
import java.util.*;

public class TemplateControl extends AbstractReaderTC {
    private String mForwardTo;

    private TemplateControl( String pForwardTo, Reader pTemplate, Collection<TCsub> pSubstitutions ) {
        super( pTemplate, pSubstitutions );
        mForwardTo = pForwardTo;
    }

    public TemplateControl( String pForwardTo ) {
        this( Confirm.significant( "ForwardTo", pForwardTo ), null, null );
    }

    public TemplateControl( Reader pTemplate, Collection<TCsub> pSubstitutions ) {
        this( null, pTemplate, pSubstitutions );
        Confirm.isNotNull( "Template", mTemplate = pTemplate );
    }

    public TemplateControl( Reader pTemplate, TCsub... pSubstitutions ) {
        this( pTemplate, makeSet( pSubstitutions ) );
    }

    public TemplateControl( Reader pTemplate, String... pSubstitutions ) {
        this( pTemplate, makeSet( pSubstitutions ) );
    }

    public TemplateControl( String pTemplate, String... pSubstitutions ) {
        this( new StringReader( pTemplate ), pSubstitutions );
    }

    public boolean isForwardTo() {
        return (mForwardTo != null);
    }

    public String getForwardTo() {
        return mForwardTo;
    }

    /**
     * Transfers the text from mTemplate to the pWriter applying the mSubstitutions.
     *
     * @param pWriter - !null
     */
    public final void applyTo( Writer pWriter, String pReplaceNotFoundsWith )
            throws IOException {
        Confirm.isNotNull( "Writer", pWriter );
        pReplaceNotFoundsWith = ConstrainTo.notNull( pReplaceNotFoundsWith );
        pWriter.write( blocksFromReaderReplace( pWriter, pReplaceNotFoundsWith ) );
        pWriter.flush();
    }
}