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/*

 * This file is available under and governed by the GNU General Public

 * License version 2 only, as published by the Free Software Foundation.

 * However, the following notice accompanied the original version of this

 * file:

 *

 * Copyright (c) 2008-2012, Stephen Colebourne & Michael Nascimento Santos

 *

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 *  * Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 *

 *  * Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 *

 *  * Neither the name of JSR-310 nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

package java.time.format;

import java.time.temporal.TemporalField;

import java.util.ArrayList;

import java.util.Locale;

import java.util.Objects;

/**

 * Context object used during date and time parsing.

 * <p>

 * This class represents the current state of the parse.

 * It has the ability to store and retrieve the parsed values and manage optional segments.

 * It also provides key information to the parsing methods.

 * <p>

 * Once parsing is complete, the {@link #toBuilder()} is typically used

 * to obtain a builder that can combine the separate parsed fields into meaningful values.

 *

 * <h3>Specification for implementors</h3>

 * This class is a mutable context intended for use from a single thread.

 * Usage of the class is thread-safe within standard parsing as a new instance of this class

 * is automatically created for each parse and parsing is single-threaded

 *

 * @since 1.8

 */

    /**

     * The formatter, not null.

     */

    private DateTimeFormatter formatter;

    /**

     * Whether to parse using case sensitively.

     */

    private boolean caseSensitive = true;

    /**

     * Whether to parse using strict rules.

     */

    private boolean strict = true;

    /**

     * The list of parsed data.

     */

    private final ArrayList<Parsed> parsed = new ArrayList<>();

    /**

     * Creates a new instance of the context.

     *

     * @param formatter  the formatter controlling the parse, not null

     */

    DateTimeParseContext(DateTimeFormatter formatter) {

        super();

        this.formatter = formatter;

        parsed.add(new Parsed());

    }

    /**

     * Creates a copy of this context.

     */

    DateTimeParseContext copy() {

        return new DateTimeParseContext(formatter);

    }

    //-----------------------------------------------------------------------

    /**

     * Gets the locale.

     * <p>

     * This locale is used to control localization in the parse except

     * where localization is controlled by the symbols.

     *

     * @return the locale, not null

     */

        return formatter.getLocale();

    }

    /**

     * Gets the formatting symbols.

     * <p>

     * The symbols control the localization of numeric parsing.

     *

     * @return the formatting symbols, not null

     */

        return formatter.getSymbols();

    }

    //-----------------------------------------------------------------------

    /**

     * Checks if parsing is case sensitive.

     *

     * @return true if parsing is case sensitive, false if case insensitive

     */

        return caseSensitive;

    }

    /**

     * Sets whether the parsing is case sensitive or not.

     *

     * @param caseSensitive  changes the parsing to be case sensitive or not from now on

     */

        this.caseSensitive = caseSensitive;

    }

    /**

     * Helper to compare two {@code CharSequence} instances.

     * This uses {@link #isCaseSensitive()}.

     *

     * @param cs1  the first character sequence, not null

     * @param offset1  the offset into the first sequence, valid

     * @param cs2  the second character sequence, not null

     * @param offset2  the offset into the second sequence, valid

     * @param length  the length to check, valid

     * @return true if equal

     */

        if (offset1 + length > cs1.length() || offset2 + length > cs2.length()) {

            return false;

        }

        if (isCaseSensitive()) {

            for (int i = 0; i < length; i++) {

                char ch1 = cs1.charAt(offset1 + i);

                char ch2 = cs2.charAt(offset2 + i);

                if (ch1 != ch2) {

                    return false;

                }

            }

        } else {

            for (int i = 0; i < length; i++) {

                char ch1 = cs1.charAt(offset1 + i);

                char ch2 = cs2.charAt(offset2 + i);

                if (ch1 != ch2 && Character.toUpperCase(ch1) != Character.toUpperCase(ch2) &&

                        Character.toLowerCase(ch1) != Character.toLowerCase(ch2)) {

                    return false;

                }

            }

        }

        return true;

    }

    //-----------------------------------------------------------------------

    /**

     * Checks if parsing is strict.

     * <p>

     * Strict parsing requires exact matching of the text and sign styles.

     *

     * @return true if parsing is strict, false if lenient

     */

        return strict;

    }

    /**

     * Sets whether parsing is strict or lenient.

     *

     * @param strict  changes the parsing to be strict or lenient from now on

     */

        this.strict = strict;

    }

    //-----------------------------------------------------------------------

    /**

     * Starts the parsing of an optional segment of the input.

     */

    void startOptional() {

        parsed.add(currentParsed().copy());

    }

    /**

     * Ends the parsing of an optional segment of the input.

     *

     * @param successful  whether the optional segment was successfully parsed

     */

    void endOptional(boolean successful) {

        if (successful) {

            parsed.remove(parsed.size() - 2);

        } else {

            parsed.remove(parsed.size() - 1);

        }

    }

    //-----------------------------------------------------------------------

    /**

     * Gets the currently active temporal objects.

     *

     * @return the current temporal objects, not null

     */

    private Parsed currentParsed() {

        return parsed.get(parsed.size() - 1);

    }

    //-----------------------------------------------------------------------

    /**

     * Gets the first value that was parsed for the specified field.

     * <p>

     * This searches the results of the parse, returning the first value found

     * for the specified field. No attempt is made to derive a value.

     * The field may have an out of range value.

     * For example, the day-of-month might be set to 50, or the hour to 1000.

     *

     * @param field  the field to query from the map, null returns null

     * @return the value mapped to the specified field, null if field was not parsed

     */

    }

    /**

     * Stores the parsed field.

     * <p>

     * This stores a field-value pair that has been parsed.

     * The value stored may be out of range for the field - no checks are performed.

     *

     * @param field  the field to set in the field-value map, not null

     * @param value  the value to set in the field-value map

     */

        Objects.requireNonNull(field, "field");

    }

    /**

     * <p>

     *

     */

    }

    //-----------------------------------------------------------------------

    /**

     * Returns a {@code DateTimeBuilder} that can be used to interpret

     * the results of the parse.

     * <p>

     * This method is typically used once parsing is complete to obtain the parsed data.

     * Parsing will typically result in separate fields, such as year, month and day.

     * The returned builder can be used to combine the parsed data into meaningful

     * objects such as {@code LocalDate}, potentially applying complex processing

     * to handle invalid parsed data.

     *

     * @return a new builder with the results of the parse, not null

     */

        DateTimeBuilder builder = new DateTimeBuilder();

            } else {

            }

        }

    }

    //-----------------------------------------------------------------------

    /**

     * Returns a string version of the context for debugging.

     *

     * @return a string representation of the context data, not null

     */

    @Override

    public String toString() {

        return currentParsed().toString();

    }

    //-----------------------------------------------------------------------

    /**

     * Temporary store of parsed data.

     */

    private static final class Parsed {

        private Parsed() {

        }

        protected Parsed copy() {

            Parsed cloned = new Parsed();

            return cloned;

        }

        @Override

        public String toString() {

        }

    }

}