/*
 * Copyright (c) 2014 David Sowerby
 *
 * Licensed 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 uk.q3c.krail.core.navigate;

import uk.q3c.krail.core.navigate.sitemap.PageRecord;

import java.util.HashSet;
import java.util.Set;

/**
 * Splits the supplied line (originally from sitemap.properties, [standardPageMapping] section). Checks syntax and
 * records errors as necessary
 *
 * @author David Sowerby
 */
public class StandardPageMappingReader {

    public static final String missingLabelKeyMsg = "Line must contain label key prefixed with '~'";
    public static final String missingViewMsg = "Line must contain view name prefixed with ':'";
    public static final String missingUriMsg = "Line must contain URI prefixed with '='";
    public static final String emptyViewMsg = "View class name cannot be empty";
    public static final String emptyLabelKeyMsg = "Label key cannot be empty";
    public static final String emptyStandardPageKey = "Standard page key name cannot be empty";
    private final Set<String> syntaxErrors = new HashSet<>();

    public PageRecord deconstruct(String line, int lineNumber) {
        if (!line.contains("~")) {
            syntaxErrors.add(missingLabelKeyMsg + " at line " + lineNumber);
            return null;
        }
        // if (!line.contains(":")) {
        // syntaxErrors.add(missingViewMsg + " at line " + lineNumber);
        // return null;
        // }
        if (!line.contains("=")) {
            syntaxErrors.add(missingUriMsg + " at line " + lineNumber);
            return null;
        }
        // Public_Home=public ~ Yes
        PageRecord pr = new PageRecord();
        String[] s = line.split("=");
        pr.setStandardPageKeyName(s[0].trim());
        String[] s1 = s[1].split("~");
        pr.setUri(s1[0].trim());
        pr.setSegment(segmentFromUri(s1[0]).trim());
        pr.setLabelKeyName(s1[1].trim());

        if (pr.getStandardPageKeyName()
              .isEmpty()) {
            syntaxErrors.add(emptyStandardPageKey + " at line " + lineNumber);
            return null;
        }
        if (pr.getLabelKeyName()
              .isEmpty()) {
            syntaxErrors.add(emptyLabelKeyMsg + " at line " + lineNumber);
            return null;
        }
        return pr;
    }

    private String segmentFromUri(String uri) {
        if (!(uri.contains("/"))) {
            return uri;
        }
        String[] segments = uri.split("/");
        return segments[segments.length - 1];
    }

    public Set<String> getSyntaxErrors() {
        return syntaxErrors;
    }
}