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/*
 * Copyright (c) 2020-2030, Shuigedeng ([email protected] & https://blog.taotaocloud.top/).
 *
 * 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
 *
 *      https://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.taotao.boot.data.p6spy.logger;

import com.p6spy.engine.logging.Category;
import com.p6spy.engine.spy.P6SpyOptions;
import com.taotao.boot.common.utils.context.ContextUtils;
import org.springframework.context.ConfigurableApplicationContext;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;

/**
 * FileLogger
 *
 * @author shuigedeng
 * @version 2022.03
 * @since 2021/10/28 09:33
 */
public class FileLogger extends com.p6spy.engine.spy.appender.BatchFileLogger {

    private String fileName = null;
    private volatile PrintStream printStream = null;

    private void init() {
        if (fileName == null) {
            throw new IllegalStateException("setLogfile() must be called before init()");
        }

        ConfigurableApplicationContext applicationContext = ContextUtils.getApplicationContext();
        String realFileName = applicationContext.getEnvironment().resolvePlaceholders(fileName);

        try {
            File file = new File(realFileName);
            if (!file.getParentFile().exists()) {
                file.getParentFile().mkdirs();
            }

            if (!file.exists()) {
                file.createNewFile();
            }

            printStream = new PrintStream(
                    new FileOutputStream(file, P6SpyOptions.getActiveInstance().getAppend()));
        } catch (IOException e) {
            throw new IllegalStateException("couldn't create PrintStream for " + fileName, e);
        }
    }

    @Override
    protected PrintStream getStream() {
        // Lazy init to allow for the appender to be changed at Runtime without creating an empty
        // log file (assuming
        // that no log message has been written yet)
        if (printStream == null) {
            synchronized (this) {
                if (printStream == null) {
                    init();
                }
            }
        }
        return printStream;
    }

    public void setLogfile(String fileName) {
        this.fileName = fileName;
    }

    @Override
    public void logSQL(
            int connectionId, String now, long elapsed, Category category, String prepared, String sql, String url) {
        super.logSQL(connectionId, now, elapsed, category, prepared, sql, url);
    }
}