/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jena.sparql.sse.builders;

import org.apache.jena.sparql.sse.Item;
import org.apache.jena.sparql.sse.ItemList;
import org.apache.jena.sparql.sse.ItemLocation;

public class BuilderLib {

    public static void checkNode(Item item) {
        if ( item.isNode() )
            return;
        broken(item, "Not a node: " + item.shortString());
    }

    public static void checkSymbol(Item item) {
        if ( item.isSymbol() )
            return;
        broken(item, "Not a symbol: " + item.shortString());
    }

    public static void checkTagged(Item item, String tag, String msg) {
        if ( item.isTagged(tag) )
            return;
        broken(item, msg, item);
    }

    public static void checkTagged(Item item, int len, String tag, String msg) {
        if ( item.isTagged(tag) && item.getList().size() == len )
            return;
        broken(item, msg, item);
    }

    public static void checkTag(ItemList list, String tag) {
        if ( list.size() == 0 )
            broken(list, "Empty list");
        if ( !list.get(0).isSymbolIgnoreCase(tag) )
            broken(list, "List does not start (" + tag + "...) : " + list.shortString());
    }

    public static void checkList(Item item) {
        if ( item.isList() )
            return;
        broken(item, "Not a list: " + item.shortString());
    }

    public static void checkList(Item item, String msg) {
        if ( item.isList() )
            return;
        if ( msg == null && item.isSymbol() )
            msg = "Attempt to use a symbol where list expected: " + item.shortString();
        if ( msg == null && item.isNode() )
            msg = "Attempt to use a node where list expected: " + item.shortString();
        if ( msg == null )
            msg = "Not a list";
        broken(item, msg);
    }

    public static void checkLength(int len1, int len2, ItemList list, String msg) {
        if ( list.size() >= len1 && list.size() <= len2 )
            return;
        if ( msg == null )
            msg = "Wrong number of arguments: (" + len1 + "-" + len2 + ")/" + list.size() + " : " + list.shortString();
        else
            msg = msg + " : " + list.shortString();
        broken(list, msg);
    }

    public static void checkLength(int len, ItemList list, String msg) {
        if ( list.size() == len )
            return;

        if ( msg == null )
            msg = "Wrong number of arguments: " + len + "/" + list.size() + " : " + list.shortString();
        else
            msg = msg + " : " + list.shortString();
        broken(list, msg);
    }

    public static void checkLengthAtLeast(int len, ItemList list, String msg) {
        if ( list.size() >= len )
            return;

        if ( msg == null )
            msg = "Too few arguments: want > " + len + " :got : " + list.size() + " : " + list.shortString();
        else
            msg = msg + " : " + list.shortString();
        broken(list, msg);
    }

    public static void broken(Item item, String msg) {
        broken(item, msg, item);
    }

    public static void broken(String msg) {
        exception(msg);
    }

    public static void exception(String msg) {
        throw new ExprBuildException(msg);
    }

    public static void broken(ItemLocation location, String msg, Item item) {
        msg = msg(location, msg);
        exception(msg);
    }

    public static void broken(ItemList list, String msg) {
        broken(list, msg, list);
    }

    public static void broken(ItemLocation location, String msg, ItemList list) {
        msg = msg(location, msg);
        exception(msg);
    }

    public static void broken(ItemLocation location, String msg) {
        msg = msg(location, msg);
        exception(msg);
    }

    public static String msg(ItemLocation location, String msg) {
        if ( location != null )
            msg = location.location() + ": " + msg;
        return msg;
    }

    public static ItemList skipTag(ItemList list, String tag) {
        if ( list.size() > 0 ) {
            if ( list.get(0).isSymbol(tag) )
                list = list.cdr();
        }
        return list;
    }
}
