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/*
 * Copyright (c) 2002-2012 Alibaba Group Holding Limited.
 * All rights reserved.
 *
 * 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 com.alibaba.antx.util.cli;

public class PatternOptionBuilder {
    /// TODO: These need to break out to OptionType and also to be pluggable.

    /** String class */
    public static final Class STRING_VALUE = java.lang.String.class;

    /** Object class */
    public static final Class OBJECT_VALUE = java.lang.Object.class;

    /** Number class */
    public static final Class NUMBER_VALUE = java.lang.Number.class;

    /** Date class */
    public static final Class DATE_VALUE = java.util.Date.class;

    /** Class class */
    public static final Class CLASS_VALUE = java.lang.Class.class;

    /// can we do this one?? 
    // is meant to check that the file exists, else it errors.
    // ie) it's for reading not writing.

    /** FileInputStream class */
    public static final Class EXISTING_FILE_VALUE = java.io.FileInputStream.class;

    /** File class */
    public static final Class FILE_VALUE = java.io.File.class;

    /** File array class */
    public static final Class FILES_VALUE = java.io.File[].class;

    /** URL class */
    public static final Class URL_VALUE = java.net.URL.class;

    /**
     * 
     * Retrieve the class that ch represents.
     * 
     *
     * @param ch the specified character
     * @return The class that ch represents
     */
    public static Object getValueClass(char ch) {
        if (ch == '@') {
            return PatternOptionBuilder.OBJECT_VALUE;
        } else if (ch == ':') {
            return PatternOptionBuilder.STRING_VALUE;
        } else if (ch == '%') {
            return PatternOptionBuilder.NUMBER_VALUE;
        } else if (ch == '+') {
            return PatternOptionBuilder.CLASS_VALUE;
        } else if (ch == '#') {
            return PatternOptionBuilder.DATE_VALUE;
        } else if (ch == '<') {
            return PatternOptionBuilder.EXISTING_FILE_VALUE;
        } else if (ch == '>') {
            return PatternOptionBuilder.FILE_VALUE;
        } else if (ch == '*') {
            return PatternOptionBuilder.FILES_VALUE;
        } else if (ch == '/') {
            return PatternOptionBuilder.URL_VALUE;
        }

        return null;
    }

    /**
     * 
     * Returns whether ch is a value code, i.e. whether it
     * represents a class in a pattern.
     * 
     *
     * @param ch the specified character
     * @return true if ch is a value code, otherwise false.
     */
    public static boolean isValueCode(char ch) {
        if (ch != '@' && ch != ':' && ch != '%' && ch != '+' && ch != '#' && ch != '<' && ch != '>' && ch != '*'
            && ch != '/') {
            return false;
        }

        return true;
    }

    /**
     * 
     * Returns the {@link Options} instance represented by pattern.
     * 
     *
     * @param pattern the pattern string
     * @return The {@link Options} instance
     */
    public static Options parsePattern(String pattern) {
        int sz = pattern.length();

        char opt = ' ';
        char ch = ' ';
        boolean required = false;
        Object type = null;

        Options options = new Options();

        for (int i = 0; i < sz; i++) {
            ch = pattern.charAt(i);

            // a value code comes after an option and specifies 
            // details about it
            if (!isValueCode(ch)) {
                if (opt != ' ') {
                    // we have a previous one to deal with
                    options.addOption(new OptionBuilder().hasArg(type != null).isRequired(required).withType(type)
                                                         .create(opt));
                    required = false;
                    type = null;
                    opt = ' ';
                }

                opt = ch;
            } else if (ch == '!') {
                required = true;
            } else {
                type = getValueClass(ch);
            }
        }

        if (opt != ' ') {
            // we have a final one to deal with
            options.addOption(new OptionBuilder().hasArg(type != null).isRequired(required).withType(type).create(opt));
        }

        return options;
    }
}