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/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.core.subst;

import ch.qos.logback.core.CoreConstants;
import ch.qos.logback.core.spi.ScanException;
import java.util.ArrayList;
import java.util.List;

// @deprecated This internal logback API is not supported by AEM as a Cloud Service.
@Deprecated(since = "2022-01-27")
public class Tokenizer {

    enum TokenizerState {

        LITERAL_STATE, START_STATE, DEFAULT_VAL_STATE
    }

    final String pattern;

    final int patternLength;

    public Tokenizer(String pattern) {
        this.pattern = pattern;
        patternLength = pattern.length();
    }

    TokenizerState state = TokenizerState.LITERAL_STATE;

    int pointer = 0;

    List tokenize() throws ScanException {
        List tokenList = new ArrayList();
        StringBuilder buf = new StringBuilder();
        while (pointer < patternLength) {
            char c = pattern.charAt(pointer);
            pointer++;
            switch(state) {
                case LITERAL_STATE:
                    handleLiteralState(c, tokenList, buf);
                    break;
                case START_STATE:
                    handleStartState(c, tokenList, buf);
                    break;
                case DEFAULT_VAL_STATE:
                    handleDefaultValueState(c, tokenList, buf);
                default:
            }
        }
        // EOS
        switch(state) {
            case LITERAL_STATE:
                addLiteralToken(tokenList, buf);
                break;
            case DEFAULT_VAL_STATE:
                // trailing colon. see also LOGBACK-1140
                buf.append(CoreConstants.COLON_CHAR);
                addLiteralToken(tokenList, buf);
                break;
            case START_STATE:
                // trailing $. see also LOGBACK-1149
                buf.append(CoreConstants.DOLLAR);
                addLiteralToken(tokenList, buf);
                break;
        }
        return tokenList;
    }

    private void handleDefaultValueState(char c, List tokenList, StringBuilder stringBuilder) {
        switch(c) {
            case CoreConstants.DASH_CHAR:
                tokenList.add(Token.DEFAULT_SEP_TOKEN);
                state = TokenizerState.LITERAL_STATE;
                break;
            case CoreConstants.DOLLAR:
                stringBuilder.append(CoreConstants.COLON_CHAR);
                addLiteralToken(tokenList, stringBuilder);
                stringBuilder.setLength(0);
                state = TokenizerState.START_STATE;
                break;
            default:
                stringBuilder.append(CoreConstants.COLON_CHAR).append(c);
                state = TokenizerState.LITERAL_STATE;
                break;
        }
    }

    private void handleStartState(char c, List tokenList, StringBuilder stringBuilder) {
        if (c == CoreConstants.CURLY_LEFT) {
            tokenList.add(Token.START_TOKEN);
        } else {
            stringBuilder.append(CoreConstants.DOLLAR).append(c);
        }
        state = TokenizerState.LITERAL_STATE;
    }

    private void handleLiteralState(char c, List tokenList, StringBuilder stringBuilder) {
        if (c == CoreConstants.DOLLAR) {
            addLiteralToken(tokenList, stringBuilder);
            stringBuilder.setLength(0);
            state = TokenizerState.START_STATE;
        } else if (c == CoreConstants.COLON_CHAR) {
            addLiteralToken(tokenList, stringBuilder);
            stringBuilder.setLength(0);
            state = TokenizerState.DEFAULT_VAL_STATE;
        } else if (c == CoreConstants.CURLY_LEFT) {
            addLiteralToken(tokenList, stringBuilder);
            tokenList.add(Token.CURLY_LEFT_TOKEN);
            stringBuilder.setLength(0);
        } else if (c == CoreConstants.CURLY_RIGHT) {
            addLiteralToken(tokenList, stringBuilder);
            tokenList.add(Token.CURLY_RIGHT_TOKEN);
            stringBuilder.setLength(0);
        } else {
            stringBuilder.append(c);
        }
    }

    private void addLiteralToken(List tokenList, StringBuilder stringBuilder) {
        if (stringBuilder.length() == 0)
            return;
        tokenList.add(new Token(Token.Type.LITERAL, stringBuilder.toString()));
    }
}