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package org.apache.cayenne.template;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.apache.cayenne.template.directive.Bind;
import org.apache.cayenne.template.directive.BindEqual;
import org.apache.cayenne.template.directive.BindNotEqual;
import org.apache.cayenne.template.directive.BindObjectEqual;
import org.apache.cayenne.template.directive.BindObjectNotEqual;
import org.apache.cayenne.template.directive.Directive;
import org.apache.cayenne.template.directive.Result;

/**
 * @since 4.1
 */
public class DefaultTemplateContextFactory implements TemplateContextFactory {

    private final SQLTemplateRenderingUtils helper;

    // directive map is static for now, can be easily injected
    private final Map directives;

    public DefaultTemplateContextFactory() {
        Map directiveHashMap = new HashMap<>();
        directiveHashMap.put("bind", Bind.INSTANCE);
        directiveHashMap.put("bindEqual", BindEqual.INSTANCE);
        directiveHashMap.put("bindNotEqual", BindNotEqual.INSTANCE);
        directiveHashMap.put("bindObjectEqual", BindObjectEqual.INSTANCE);
        directiveHashMap.put("bindObjectNotEqual", BindObjectNotEqual.INSTANCE);
        directiveHashMap.put("result", Result.INSTANCE);

        directives = Collections.unmodifiableMap(directiveHashMap);
        helper = new SQLTemplateRenderingUtils();
    }

    @Override
    public Context createContext(Map parameters, boolean positionalMode) {
        Map realParameters = new HashMap<>(parameters.size() + 1);
        realParameters.putAll(parameters);
        realParameters.put("helper", helper);
        return new Context(directives, realParameters, positionalMode);
    }
}