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/*-
 * ========================LICENSE_START=================================
 * flyway-gcp-spanner
 * ========================================================================
 * Copyright (C) 2010 - 2024 Red Gate Software Ltd
 * ========================================================================
 * 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.
 * =========================LICENSE_END==================================
 */
package org.flywaydb.database.spanner;

import lombok.CustomLog;
import org.flywaydb.core.api.configuration.Configuration;
import org.flywaydb.core.internal.parser.Parser;
import org.flywaydb.core.internal.parser.ParserContext;
import org.flywaydb.core.internal.parser.ParsingContext;
import org.flywaydb.core.internal.parser.PeekingReader;
import org.flywaydb.core.internal.parser.Token;
import org.flywaydb.core.internal.parser.TokenType;

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

@CustomLog
public class SpannerParser extends Parser {

    private boolean previousStatementStartedBatch = false;

    public SpannerParser(Configuration configuration, ParsingContext parsingContext) {
        super(configuration, parsingContext, 3);
    }

    @Override
    protected char getIdentifierQuote() {
        return '`';
    }

    protected char getAlternativeIdentifierQuote() {
        return '\"';
    }

    @Override
    protected Boolean detectCanExecuteInTransaction(String simplifiedStatement, List keywords) {
        LOG.debug("checking if [" + simplifiedStatement + "] can run in transaction");
        // Flyway tries to do hold transaction in which migration will happen
        return false;
    }

    @Override
    protected boolean shouldAdjustBlockDepth(ParserContext context, List tokens, Token token) {
        return previousStatementStartedBatch || super.shouldAdjustBlockDepth(context, tokens, token) || token.getType() == TokenType.DELIMITER;
    }

    @Override
    protected void adjustBlockDepth(ParserContext context, List tokens, Token keyword, PeekingReader reader) throws IOException {
        String keywordText = keyword.getText();
        if (previousStatementStartedBatch) {
            context.increaseBlockDepth("");
            previousStatementStartedBatch = false;
        }
        if (tokens.stream().anyMatch(t -> "START".equals(t.getText())) && keyword.getType() == TokenType.DELIMITER) {
            previousStatementStartedBatch = true;
        }
        if ("RUN".equals(keywordText) && context.getBlockDepth() > 0) {
            context.decreaseBlockDepth();
        }
        super.adjustBlockDepth(context, tokens, keyword, reader);
    }
}