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Server Implementation of the Language Server Protocol for Apache Camel
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/**
 * 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
 *
 *      https://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 com.github.cameltooling.lsp.internal.modelinemodel;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CompletableFuture;

import org.apache.camel.catalog.CamelCatalog;
import org.eclipse.lsp4j.CompletionItem;
import org.eclipse.lsp4j.Hover;
import org.eclipse.lsp4j.Position;
import org.eclipse.lsp4j.TextDocumentItem;

import com.github.cameltooling.lsp.internal.completion.modeline.CamelKModelineOptionNames;
import com.github.cameltooling.lsp.internal.instancemodel.ILineRangeDefineable;
import com.github.cameltooling.lsp.internal.parser.CamelKModelineParser;

public class CamelKModeline implements ILineRangeDefineable {
	
	private String fullModeline;
	private List options = new ArrayList<>();
	private int endOfPrefixPositionInline;
	private int line;

	public CamelKModeline(String fullModeline, TextDocumentItem documentItem, int line) {
		this.fullModeline = fullModeline;
		this.line = line;
		String modelineCamelkStart = new CamelKModelineParser().retrieveModelineCamelKStart(fullModeline);
		if(modelineCamelkStart != null) {
			endOfPrefixPositionInline = modelineCamelkStart.length();
			parseOptions(fullModeline, modelineCamelkStart, documentItem);
		} else {
			endOfPrefixPositionInline = -1;
		}
	}

	private void parseOptions(String fullModeline, String modelineCamelkStart, TextDocumentItem documentItem) {
		int currentPosition = modelineCamelkStart.length();
		String remainingModeline = fullModeline.substring(currentPosition);
		while(!remainingModeline.isEmpty()) {
			int nextSpaceLikeCharacter = getNextSpaceLikeCharacter(remainingModeline);
			if(nextSpaceLikeCharacter != -1) {
				options.add(new CamelKModelineOption(remainingModeline.substring(1, nextSpaceLikeCharacter), currentPosition + 1, documentItem, line));
				remainingModeline = remainingModeline.substring(nextSpaceLikeCharacter);
				currentPosition += nextSpaceLikeCharacter; 
			} else {
				if(!remainingModeline.trim().isEmpty() && !isEnfOfXmlModeline(remainingModeline.trim())) {
					options.add(new CamelKModelineOption(remainingModeline.substring(1), currentPosition + 1, documentItem, line));
				}
				remainingModeline = "";
			}
		}
	}

	private boolean isEnfOfXmlModeline(String remainingModeline) {
		return "-->".equals(remainingModeline);
	}

	private int getNextSpaceLikeCharacter(String remainingModeline) {
		int nextSpace = remainingModeline.indexOf(' ', 1);
		int nextTab = remainingModeline.indexOf('\t', 1);
		if(nextSpace == -1) {
			return nextTab;
		} else if(nextTab == -1){
			return nextSpace;
		} else {
			return Math.min(nextSpace, nextTab);
		}
	}

	@Override
	public int getLine() {
		return line;
	}

	@Override
	public int getStartPositionInLine() {
		return 0;
	}

	@Override
	public int getEndPositionInLine() {
		return fullModeline.length();
	}

	public List getOptions() {
		return options;
	}

	public CompletableFuture> getCompletions(int character, CompletableFuture camelCatalog) {
		if(endOfPrefixPositionInline != -1 && character >= endOfPrefixPositionInline) {
			for (CamelKModelineOption camelKModelineOption : options) {
				if(camelKModelineOption.isInRange(character)) {
					return camelKModelineOption.getCompletions(character, camelCatalog);
				}
			}
			return CompletableFuture.completedFuture(CamelKModelineOptionNames.getCompletionItems());
		}
		return CompletableFuture.completedFuture(Collections.emptyList());
	}
	
	public CompletableFuture getHover(Position position, CompletableFuture camelCatalog) {
		for (CamelKModelineOption camelKModelineOption : options) {
			if(camelKModelineOption.isInRange(position.getCharacter())) {
				return camelKModelineOption.getHover(position, camelCatalog);
			}
		}
		return CompletableFuture.completedFuture(null);
	}
	
}