/*******************************************************************************
 * Copyright (c) 2013, 2018 Red Hat, Inc.
 *
 * This program and the accompanying materials are made
 * available under the terms of the Eclipse Public License 2.0
 * which is available at https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     Neil Guzman - ruby implementation (B#350066)
 *******************************************************************************/
package org.eclipse.linuxtools.internal.rpmstubby.model;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.linuxtools.internal.rpmstubby.StubbyLog;
import org.eclipse.linuxtools.internal.rpmstubby.parser.CommonMetaData;
import org.eclipse.linuxtools.internal.rpmstubby.parser.RubyGemParser;

/**
 * Gives easy access to data from the ruby gemspec file.
 *
 */
public class GemModel {

    private static final String FIX_ME = "#FIXME";

    private static final String SUMMARY = "summary";
    private static final String RUBYGEMS_VERSION = "rubygems_version";
    private static final String REQUIRE_PATHS = "require_paths";
    private static final String DEPENDENCY = "add_dependency";
    private static final String DEVELOPMENT_DEPENDENCY = "add_development_dependency";
    private static final String RUNTIME_DEPENDENCY = "add_runtime_dependency";
    private static final String HOMEPAGE = "homepage";

    /**
     * Options in the gemspec file that are supposed to only have 1 value
     *
     */
    private static final String[] SINGLE_VALUES = { CommonMetaData.DESCRIPTION,
            CommonMetaData.NAME, CommonMetaData.VERSION,
            CommonMetaData.LICENSE, SUMMARY, RUBYGEMS_VERSION, HOMEPAGE };

    private RubyGemParser rubyGemParser;

    /**
     * Ruby gemspec file
     *
     * @param file
     *            The Ruby gemspec file
     */
    public GemModel(IFile file) {
        try {
            rubyGemParser = new RubyGemParser(file);
        } catch (IOException | CoreException e) {
            StubbyLog.logError(e);
        }
    }

    /**
     * Get the value from one of the gemspec attributes. If the value is empty, it
     * will return #FIXME
     *
     * @param attr
     *            The gemspec attribute to get value of
     * @return The value of the option
     */
    private String getValue(String attr) {
        List<String> list = rubyGemParser.getValueList(attr);
        String rc = "";
        boolean single = false;

        for (String str : SINGLE_VALUES) {
            if (str.equals(attr)) {
                single = true;
                break;
            }
        }

        if (!list.isEmpty() && single) {
            rc = list.get(0);
        } else {
            rc = FIX_ME;
        }

        return rc;
    }

    /**
     * Get the install requires in the gemspec file
     *
     * @param key
     *            Either the dependencies or the development dependencies option
     * @return A list of the values taken from the gemspec
     */
    public List<String> getDependencies(String key) {
        List<String> rc = new ArrayList<>();
        List<String> temp = rubyGemParser.getValueList(key);

        if (!temp.isEmpty()) {
            for (String tmp : temp) {
                rc.add(tmp
                        .replaceFirst("(?:%q|%Q)(?:([\\W])([^\\W]+)[\\W])",
                                "$2").replaceAll("(\"|'|\\[|\\])", "")
                        .replace(",", ""));
            }
        }
        return rc;
    }

    /**
     * Get the values from the add_dependency option
     *
     * @return The values within add_dependency
     */
    public List<String> getInstallRequiresList() {
        List<String> rc = getDependencies(DEPENDENCY);
        rc.addAll(getDependencies(RUNTIME_DEPENDENCY));
        return getDependencies(DEPENDENCY);
    }

    /**
     * Get the values from the add_development_dependency option
     *
     * @return The values within add_development_dependency
     */
    public List<String> getBuildRequiresList() {
        return getDependencies(DEVELOPMENT_DEPENDENCY);
    }

    /**
     * Returns the package name.
     *
     * @return The package name.
     */
    public String getSimplePackageName() {
        return getValue(CommonMetaData.NAME);
    }

    /**
     * The simple package name with "rubygem-" prepended to make better RPM
     * package name.
     *
     * @return The package
     */
    public String getPackageName() {
        String simpleName = getSimplePackageName();
        if (simpleName.startsWith("rubygem-")) {
            return simpleName;
        }
        return "rubygem-"+simpleName;
    }

    /**
     * Returns the version
     *
     * @return The version
     */
    public String getVersion() {
        String version = getValue(CommonMetaData.VERSION);

        if (!hasDigits(version)) {
            version = "1 " + FIX_ME;
        }

        return version;
    }

    /**
     * Returns the RubyGems version
     *
     * @return The RubyGems version
     */
    public String getGemVersion() {
        String version = getValue(RUBYGEMS_VERSION);

        if (!hasDigits(version)) {
            version = FIX_ME;
        }

        return version;
    }

    /**
     * Utility method to try and see if a string contains digits within it
     *
     * @param str
     *            The string to check if it has digits
     * @return True if string contains digits
     */
    public boolean hasDigits(String str) {
        return str.matches(".*\\d.*");
    }

    /**
     * Returns the summary
     *
     * @return The package summary
     */
    public String getSummary() {
        return getValue(SUMMARY);
    }

    /**
     * Returns the license
     *
     * @return The license
     */
    public String getLicense() {
        String license = getValue("license");
        List<String> list = rubyGemParser.getValueList("licenses");

        if (license.equals(FIX_ME) && !list.isEmpty()) {
            license = "";
            for (String str : list) {
                license = license.concat(str + ", ");
                license = license.replaceAll("(\"|')", "");
            }
            license = license.substring(0, license.length() - 2);
        }

        return license;
    }

    /**
     * Returns the url
     *
     * @return The url
     */
    public String getURL() {
        return getValue(HOMEPAGE);
    }

    /**
     * Returns the description
     *
     * @return The description
     */
    public String getDescription() {
        return getValue(CommonMetaData.DESCRIPTION);
    }

    /**
     * Return the require paths
     *
     * @return The require paths
     */
    public List<String> getRequirePaths() {
        List<String> rc = new ArrayList<>();
        List<String> temp = rubyGemParser.getValueList(REQUIRE_PATHS);

        if (!temp.isEmpty()) {
            for (String tmp : temp) {
                rc.add(tmp
                        .replaceFirst("(?:%q|%Q)(?:([\\W])([^\\W]+)[\\W])",
                                "$2").replaceAll("(\"|'|\\[|\\])", "")
                        .replace(",", ""));
            }
        }

        return rc;
    }
}