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package com.sun.tools.xjc.reader.xmlschema;

import java.util.Collection;

import com.sun.tools.xjc.model.CPropertyInfo;
import com.sun.tools.xjc.model.Multiplicity;
import com.sun.tools.xjc.reader.RawTypeSet;
import com.sun.tools.xjc.reader.gbind.ConnectedComponent;
import com.sun.tools.xjc.reader.gbind.Element;
import com.sun.tools.xjc.reader.gbind.Expression;
import com.sun.tools.xjc.reader.gbind.Graph;
import com.sun.tools.xjc.reader.xmlschema.bindinfo.BIProperty;
import com.sun.xml.bind.v2.model.core.WildcardMode;
import com.sun.xml.xsom.XSParticle;

/**
 * {@link ParticleBinder} that uses {@link ExpressionBuilder} et al
 * for better, more intuitive (but non spec-conforming) binding.
 *
 * @author Kohsuke Kawaguchi
 */
final class ExpressionParticleBinder extends ParticleBinder {
    public void build(XSParticle p, Collection forcedProps) {
        // this class isn't about spec conformance, but
        // for the ease of use.
        // so we don't give a damn about 'forcedProps'.
        // although, for a future note, it's conceivable to expand
        // the binding algorithm to cover this notion.

        Expression tree = ExpressionBuilder.createTree(p);
        Graph g = new Graph(tree);
        for (ConnectedComponent cc : g) {
            buildProperty(cc);
        }
    }

    /**
     * Builds a property ouf ot a connected component.
     */
    private void buildProperty(ConnectedComponent cc) {
        StringBuilder propName = new StringBuilder(); // property name
        int nameTokenCount = 0; // combine only up to 3

        RawTypeSetBuilder rtsb = new RawTypeSetBuilder();
        for (Element e : cc) {
            GElement ge = (GElement)e;

            if(nameTokenCount<3) {
                if(nameTokenCount!=0)
                    propName.append("And");
                propName.append(makeJavaName(cc.isCollection(),ge.getPropertyNameSeed()));
                nameTokenCount++;
            }

            if(e instanceof GElementImpl) {
                GElementImpl ei = (GElementImpl) e;
                rtsb.elementDecl(ei.decl);
                continue;
            }
            if(e instanceof GWildcardElement) {
                rtsb.getRefs().add(new RawTypeSetBuilder.WildcardRef(WildcardMode.SKIP));
                continue;
            }
            assert false : e;   // no other kind should be here
        }

        Multiplicity m = Multiplicity.ONE;
        if(cc.isCollection())
            m = m.makeRepeated();
        if(!cc.isRequired())
            m = m.makeOptional();

        RawTypeSet rts = new RawTypeSet(rtsb.getRefs(),m);

        XSParticle p = findSourceParticle(cc);

        BIProperty cust = BIProperty.getCustomization(p);
        CPropertyInfo prop = cust.createElementOrReferenceProperty(
            propName.toString(), false, p, rts );
        getCurrentBean().addProperty(prop);
    }

    /**
     * Finds a {@link XSParticle} that can serve as the representative property of
     * the given {@link ConnectedComponent}.
     *
     * The representative property is used for reporting an error location and
     * taking {@link BIProperty} customization. Right now, the algorithm is just pick
     * the first one with {@link BIProperty}, but one can think of a better algorithm,
     * such as taking a choice of (A|B) if CC={A,B}.
     */
    private XSParticle findSourceParticle(ConnectedComponent cc) {
        XSParticle first = null;

        for (Element e : cc) {
            GElement ge = (GElement)e;
            for (XSParticle p : ge.particles) {
                if(first==null)
                    first = p;
                if(getLocalPropCustomization(p)!=null)
                    return p;
            }
            // if there are multiple property customizations,
            // all but one will be left unused, which will be detected as an error
            // later, so no need to check that now.
        }

        // if no customization was found, just use the first one.
        return first;
    }

    public boolean checkFallback(XSParticle p) {
        // this algorithm never falls back to 'getContent'.
        return false;
    }
}