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/*
 * Copyright (c) 2013, Francis Galiegue 
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Lesser GNU General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * Lesser GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */

package com.github.fge.jsonschema.crude;

import com.fasterxml.jackson.databind.JsonNode;
import com.github.fge.jsonschema.library.DraftV3Library;
import com.github.fge.jsonschema.library.DraftV4Library;
import com.github.fge.jsonschema.library.SchemaVersion;
import com.github.fge.jsonschema.processing.ProcessingException;
import com.github.fge.jsonschema.processing.Processor;
import com.github.fge.jsonschema.processing.ProcessorChain;
import com.github.fge.jsonschema.processing.ValidationData;
import com.github.fge.jsonschema.processing.build.FullValidationContext;
import com.github.fge.jsonschema.processing.ref.Dereferencing;
import com.github.fge.jsonschema.processing.ref.RefResolverProcessor;
import com.github.fge.jsonschema.processing.ref.SchemaLoader;
import com.github.fge.jsonschema.processing.ref.URIManager;
import com.github.fge.jsonschema.processing.selector.ProcessorSelector;
import com.github.fge.jsonschema.processing.validation.ValidationChain;
import com.github.fge.jsonschema.processing.validation.ValidationProcessor;
import com.github.fge.jsonschema.report.ListProcessingReport;
import com.github.fge.jsonschema.report.ProcessingReport;
import com.github.fge.jsonschema.processing.ref.SchemaBundle;
import com.github.fge.jsonschema.tree.JsonTree2;
import com.github.fge.jsonschema.tree.SchemaTree;
import com.github.fge.jsonschema.tree.SimpleJsonTree2;
import com.github.fge.jsonschema.uri.DefaultURIDownloader;
import com.github.fge.jsonschema.util.JsonLoader;

import java.io.IOException;
import java.net.URI;

import static com.github.fge.jsonschema.library.SchemaVersion.*;

public final class CrudeValidator
{
    private final SchemaLoader loader;
    private final Processor validator;

    public CrudeValidator(final SchemaVersion version,
        final Dereferencing dereferencing)
        throws IOException
    {
        final URIManager manager = new URIManager();
        manager.unregisterScheme("file");
        manager.unregisterScheme("resource");
        manager.unregisterScheme("jar");
        manager.registerScheme("https", DefaultURIDownloader.getInstance());

        loader = new SchemaLoader(manager, URI.create("#"), dereferencing);

        final SchemaBundle bundle = new SchemaBundle();
        bundle.addSchema(DRAFTV4.getLocation().toURI(),
            JsonLoader.fromResource("/draftv4/schema"));
        bundle.addSchema(DRAFTV3.getLocation().toURI(),
            JsonLoader.fromResource("/draftv3/schema"));

        loader.addBundle(bundle);

        final RefResolverProcessor refResolver = new RefResolverProcessor(loader);

        final Processor draftv4
            = new ValidationChain(DraftV4Library.get());
        final Processor draftv3
            = new ValidationChain(DraftV3Library.get());

        final Processor byDefault
            = version == DRAFTV4 ? draftv4 : draftv3;

        final Processor processor
            = new ProcessorSelector()
                .when(DRAFTV4.versionTest()).then(draftv4)
                .when(DRAFTV3.versionTest()).then(draftv3)
                .otherwise(byDefault).getProcessor();

        final Processor fullChain
            = ProcessorChain.startWith(refResolver).chainWith(processor)
            .end();
        validator = new ValidationProcessor(fullChain);
    }

    public ProcessingReport validate(final JsonNode schema,
        final JsonNode instance)
        throws ProcessingException
    {
        final ValidationData data = buildData(schema, instance);
        final ListProcessingReport report = new ListProcessingReport();
        return validator.process(report, data);
    }

    public ProcessingReport validateUnchecked(final JsonNode schema,
        final JsonNode instance)
    {
        final ValidationData data = buildData(schema, instance);
        final ListProcessingReport report = new ListProcessingReport();
        try {
            return validator.process(report, data);
        } catch (ProcessingException e) {
            return new UncheckedReport(e, report);
        }
    }

    private ValidationData buildData(final JsonNode schema,
        final JsonNode node)
    {
        final SchemaTree tree = loader.load(schema);
        final JsonTree2 instance = new SimpleJsonTree2(node);
        return new ValidationData(tree, instance);
    }
}