// 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 RepeatingTC extends AbstractTC implements TCsub {
    private String mReplacementKey;
    private Object[] mSubstituteFroms;
    private Reader mTemplate;

    public RepeatingTC( String pReplacementKey, Object[] pSubstituteFroms, Reader pTemplate, Collection<TCsub> pSubstitutions ) {
        super( pSubstitutions );
        mReplacementKey = Confirm.significant( "ReplacementKey", pReplacementKey );
        mSubstituteFroms = pSubstituteFroms;
        Confirm.isNotNull( "Template", mTemplate = pTemplate );
    }

    public RepeatingTC( String pReplacementKey, Object[] pSubstituteFroms, Reader pTemplate, TCsub... pSubstitutions ) {
        this( pReplacementKey, pSubstituteFroms, pTemplate, makeSet( pSubstitutions ) );
    }

    public RepeatingTC( String pReplacementKey, Object[] pSubstituteFroms, String pTemplate, Collection<TCsub> pSubstitutions ) {
        this( pReplacementKey, pSubstituteFroms, new StringReader( pTemplate ), pSubstitutions );
    }

    public RepeatingTC( String pReplacementKey, Object[] pSubstituteFroms, String pTemplate, TCsub... pSubstitutions ) {
        this( pReplacementKey, pSubstituteFroms, pTemplate, makeSet( pSubstitutions ) );
    }

    @Override
    public String getReplacementKey() {
        return mReplacementKey;
    }

    @Override
    public void replace( Writer pWriter, String pReplaceNotFoundsWith, Object pReplaceFrom )
            throws IOException {
        String zText = loadText();

        for ( Object zSubstituteFrom : mSubstituteFroms ) {
            pWriter.write( processSubstitutionsFrom( zText, pWriter, pReplaceNotFoundsWith, zSubstituteFrom ) );
        }
    }

    private String loadText()
            throws IOException {
        char[] zChars = new char[4096];
        int zCntRead = mTemplate.read( zChars );
        if ( zCntRead < 4096 ) {
            return (zCntRead <= 0) ? "" : new String( zChars, 0, zCntRead );
        }
        StringBuilder zSB = new StringBuilder( 9999 );
        do {
            zSB.append( zChars, 0, zCntRead );
        }
        while ( 4096 == (zCntRead = mTemplate.read( zChars )) );
        if ( zCntRead > 0 ) {
            zSB.append( zChars, 0, zCntRead );
        }
        return zSB.toString();
    }
}