#!/bin/bash
currentTime=$(date +"%Y-%m-%d-%H")
userName=$1
password=$2
dbName=$3
host=$4
# 定义备份文件存放目录
backUpPath=$5
ossPath=$6


# 获取上次备份的binlog文件名和位置
LAST_BACKUP=$(cat "$backUpPath/last_backup.txt")
LAST_BINLOG=$(echo "$LAST_BACKUP" | awk '{print $1}')
LAST_POSITION=$(echo "$LAST_BACKUP" | awk '{print $2}')

# 如果是第一次运行，设置初始值


# 获取当前binlog文件名和位置
CURRENT_BINLOG=$(mysql -u$userName -p$password -h$host -N -e "SHOW MASTER STATUS"   | awk '{print $1}')
CURRENT_POSITION=$(mysql -u$userName -p$password -h$host -N -e "SHOW MASTER STATUS" | awk '{print $2}')

if [[ -z "$LAST_BACKUP" ]]; then
    LAST_BINLOG="ON.000001"
    LAST_POSITION="0"
fi
echo ""

echo current_binlog $CURRENT_BINLOG
echo current_binPostition $CURRENT_POSITION
# 备份增量变更到文件
# 如果上次备份的binlog文件名和位置为空，则进行全量备份
cd $backUpPath
#if [ -z "$LAST_BINLOG" ]; then
#    mysqldump -u $MYSQL_USER -p$MYSQL_PASSWORD -h $MYSQL_HOST $MYSQL_DATABASE > "$BACKUP_DIR/full_backup.sql"
#else
    echo "docker exec maria /usr/bin/mysqlbinlog -u"${userName}" -p"${password}" -h"${host}" --start-position="${LAST_POSITION}" --stop-position="${CURRENT_POSITION}" "$LAST_BINLOG" > "${backUpPath}"/"${dbName}"-"${currentTime}".sql"
    docker exec maria /usr/bin/mysqlbinlog -u${userName} -p${password} -h${host} --start-position=${LAST_POSITION} --stop-position=${CURRENT_POSITION} /var/lib/mysql/$LAST_BINLOG > ${backUpPath}/${dbName}-incremental-${LAST_POSITION}-${CURRENT_POSITION}-${currentTime}.sql
    zip ${backUpPath}/${dbName}-incremental-${LAST_POSITION}-${CURRENT_POSITION}-${currentTime}.sql.zip ${backUpPath}/${dbName}-incremental-${LAST_POSITION}-${CURRENT_POSITION}-${currentTime}.sql
    rm ${backUpPath}/${dbName}-incremental-${LAST_POSITION}-${CURRENT_POSITION}-${currentTime}.sql
#fi
# 更新上次备份的binlog文件名和位置
echo "$CURRENT_BINLOG $CURRENT_POSITION" > "last_backup.txt"

OLD_BACKUPS=()
for file in ${dbName}-incremental-*.sql.zip; do
    file_date=$(echo "$file" | grep -oP "(?<=-$dbName-)\d{10}(?=.sql.zip)")
    if [[ $((CURRENT_DATE - file_date)) -gt 600 ]]; then
        OLD_BACKUPS+=("$file")
    fi
done

# 遍历数组，打印每个文件名
for file in "${backup_files[@]}"; do
    echo "$file"
done