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package org.netbeans.html.context.impl;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Comparator;

import java.util.List;

import net.java.html.BrwsrCtx;

import org.netbeans.html.context.spi.Contexts;

/** Implementation detail. Holds list of technologies for particular

 * {@link BrwsrCtx}.

 *

 * @author Jaroslav Tulach

 */

public final class CtxImpl {

    private final List<Bind<?>> techs;

    private final Object[] context;

    public CtxImpl(Object[] context) {

        this(context, new ArrayList<Bind<?>>());

    }

    private CtxImpl(Object[] context, List<Bind<?>> techs) {

        this.techs = techs;

        this.context = context;

    }

    public static <Tech> Tech find(BrwsrCtx context, Class<Tech> technology) {

        CtxImpl impl = CtxAccssr.getDefault().find(context);

        for (Bind<?> bind : impl.techs) {

            if (technology == bind.clazz) {

                return technology.cast(bind.impl);

            }

        }

        return null;

    }

    public BrwsrCtx build() {

        Collections.sort(techs, new BindCompare());

        final List<Bind<?>> arr = Collections.unmodifiableList(techs);

        CtxImpl impl = new CtxImpl(context, arr);

        BrwsrCtx ctx = CtxAccssr.getDefault().newContext(impl);

        return ctx;

    }

    public <Tech> void register(Class<Tech> type, Tech impl, int priority) {

        techs.add(new Bind<Tech>(type, impl, priority));

    }

    private static final class Bind<Tech> {

        private final Class<Tech> clazz;

        private final Tech impl;

        private final int priority;

        public Bind(Class<Tech> clazz, Tech impl, int priority) {

            this.clazz = clazz;

            this.impl = impl;

            this.priority = priority;

        }

        @Override

        public String toString() {

            return "Bind{" + "clazz=" + clazz + "@" + clazz.getClassLoader() + ", impl=" + impl + ", priority=" + priority + '}';

        }

    }

    private final class BindCompare implements Comparator<Bind<?>> {

        boolean isPrefered(Bind<?> b) {

            final Class<?> implClazz = b.impl.getClass();

            Contexts.Id id = implClazz.getAnnotation(Contexts.Id.class);

            if (id == null) {

                return false;

            }

            for (String v : id.value()) {

                for (Object c : context) {

                    if (v.equals(c)) {

                        return true;

                    }

                }

            }

            return false;

        }

        @Override

        public int compare(Bind<?> o1, Bind<?> o2) {

            boolean p1 = isPrefered(o1);

            boolean p2 = isPrefered(o2);

            if (p1 != p2) {

                return p1 ? -1 : 1;

            }

            if (o1.priority != o2.priority) {

                return o1.priority - o2.priority;

            }

            return o1.clazz.getName().compareTo(o2.clazz.getName());

        }

    } // end of BindCompare

}