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/*
 * Copyright (c) 2014, Francis Galiegue ([email protected])
 *
 * This software is dual-licensed under:
 *
 * - the Lesser General Public License (LGPL) version 3.0 or, at your option, any
 *   later version;
 * - the Apache Software License (ASL) version 2.0.
 *
 * The text of this file and of both licenses is available at the root of this
 * project or, if you have the jar distribution, in directory META-INF/, under
 * the names LGPL-3.0.txt and ASL-2.0.txt respectively.
 *
 * Direct link to the sources:
 *
 * - LGPL 3.0: https://www.gnu.org/licenses/lgpl-3.0.txt
 * - ASL 2.0: http://www.apache.org/licenses/LICENSE-2.0.txt
 */

package com.github.fge.jsonschema.library;

import com.fasterxml.jackson.databind.JsonNode;
import com.github.fge.Thawed;
import com.github.fge.jackson.NodeType;
import com.github.fge.jsonschema.core.keyword.syntax.checkers.SyntaxChecker;
import com.github.fge.jsonschema.keyword.digest.Digester;
import com.github.fge.jsonschema.keyword.digest.helpers.IdentityDigester;
import com.github.fge.jsonschema.keyword.digest.helpers.SimpleDigester;
import com.github.fge.jsonschema.keyword.validator.KeywordValidator;
import com.github.fge.jsonschema.messages.JsonSchemaConfigurationBundle;
import com.github.fge.msgsimple.bundle.MessageBundle;
import com.github.fge.msgsimple.load.MessageBundles;

import java.lang.reflect.Constructor;

/**
 * A keyword builder -- the thawed version of a {@link Keyword}
 *
 * Note that you may only supply a {@link SyntaxChecker} for a keyword, but
 * if you supply a validator class, the digester must also be present.
 * 
 */
public final class KeywordBuilder
    implements Thawed
{
    private static final MessageBundle BUNDLE
        = MessageBundles.getBundle(JsonSchemaConfigurationBundle.class);
    final String name;
    SyntaxChecker syntaxChecker;
    Digester digester;
    Constructor constructor;

    /**
     * Create a new, empty keyword builder
     *
     * @param name the name of this keyword
     * @throws NullPointerException name is null
     * @see Keyword#newBuilder(String)
     */
    KeywordBuilder(final String name)
    {
        BUNDLE.checkNotNull(name, "nullName");
        this.name = name;
    }

    /**
     * Create a thawed version of a frozen keyword
     *
     * @param keyword the keyword
     * @see Keyword#thaw()
     */
    KeywordBuilder(final Keyword keyword)
    {
        name = keyword.name;
        syntaxChecker = keyword.syntaxChecker;
        digester = keyword.digester;
        constructor = keyword.constructor;
    }

    /**
     * Add a syntax checker to this builder
     *
     * @param syntaxChecker the syntax checker
     * @return this
     * @throws NullPointerException syntax checker is null
     */
    public KeywordBuilder withSyntaxChecker(final SyntaxChecker syntaxChecker)
    {
        BUNDLE.checkNotNullPrintf(syntaxChecker, "nullSyntaxChecker", name);
        this.syntaxChecker = syntaxChecker;
        return this;
    }

    /**
     * Add a digester to this builder
     *
     * @param digester the digester
     * @return this
     * @throws NullPointerException digester is null
     */
    public KeywordBuilder withDigester(final Digester digester)
    {
        BUNDLE.checkNotNullPrintf(digester, "nullDigester", name);
        this.digester = digester;
        return this;
    }

    /**
     * Set this keyword's digester to be an {@link IdentityDigester}
     *
     * @param first the first instance type supported by this keyword
     * @param other other instance types supported by this keyword
     * @return this
     * @throws NullPointerException one or more type(s) are null
     */
    public KeywordBuilder withIdentityDigester(final NodeType first,
        final NodeType... other)
    {
        digester = new IdentityDigester(name, checkType(first),
            checkTypes(other));
        return this;
    }

    /**
     * Set this keyword's digester to be a {@link SimpleDigester}
     *
     * @param first the first instance type supported by this keyword
     * @param other other instance types supported by this keyword
     * @return this
     * @throws NullPointerException one or more type(s) are null
     */
    public KeywordBuilder withSimpleDigester(final NodeType first,
        final NodeType... other)
    {
        digester = new SimpleDigester(name, checkType(first),
            checkTypes(other));
        return this;
    }

    /**
     * Set the validator class for this keyword
     *
     * @param c the class
     * @return this
     * @throws NullPointerException class is null
     * @throws IllegalArgumentException failed to find an appropriate
     * constructor
     */
    public KeywordBuilder withValidatorClass(
        final Class c)
    {
        constructor = getConstructor(name, c);
        return this;
    }

    /**
     * Build a frozen version of this builder
     *
     * @return a {@link Keyword}
     * @throws IllegalArgumentException no syntax checker; or a constructor has
     * been supplied without a digester
     * @see Keyword#Keyword(KeywordBuilder)
     */
    @Override
    public Keyword freeze()
    {
        BUNDLE.checkArgumentPrintf(syntaxChecker != null, "noChecker", name);
        /*
         * We can have a keyword without a validator; however, if there is one,
         * there must be a digester.
         */
        BUNDLE.checkArgumentPrintf(constructor == null || digester != null,
            "malformedKeyword", name);
        return new Keyword(this);
    }


    private static Constructor getConstructor(
        final String name, final Class c)
    {
        try {
            return c.getConstructor(JsonNode.class);
        } catch (NoSuchMethodException ignored) {
            throw new IllegalArgumentException(BUNDLE.printf(
                "noAppropriateConstructor", name, c.getCanonicalName()
            ));
        }
    }

    private static NodeType checkType(final NodeType type)
    {
        return BUNDLE.checkNotNull(type, "nullType");
    }

    private static NodeType[] checkTypes(final NodeType... types)
    {
        for (final NodeType type: types)
            BUNDLE.checkNotNull(type, "nullType");
        return types;
    }
}