#!/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
execPath=""

if [ -z "$7" ]; then
  # 如果参数不存在，则使用默认值
  execPath="docker exec maria /usr/bin/mysqlbinlog"
else
  # 如果参数存在，则使用命令行参数的值
  execPath="$7"
fi


# 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"
    $execPath -u${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
    ossutil cp ${dbName}-incremental-${LAST_POSITION}-${CURRENT_POSITION}-${currentTime}.sql.zip  oss://$ossPath/$file
#fi
# 更新上次备份的binlog文件名和位置
echo "$CURRENT_BINLOG $CURRENT_POSITION" > "last_backup.txt"

calculate_hour_diff() {
    # 传入两个时间字符串作为参数
    local time1=$1
    local time2=$2

    # 截取时间字符串中的年、月、日和小时部分
    local year1=${time1:0:4}
    local month1=${time1:4:2}
    local day1=${time1:6:2}
    local hour1=${time1:8:2}

    local year2=${time2:0:4}
    local month2=${time2:4:2}
    local day2=${time2:6:2}
    local hour2=${time2:8:2}

    # 将时间字符串转换为时间戳
    local timestamp1=$(date -d "$year1-$month1-$day1 $hour1:00:00" +%s)
    local timestamp2=$(date -d "$year2-$month2-$day2 $hour2:00:00" +%s)

    # 计算两个时间戳的差值，单位为小时
    local diff_hours=$(( ($timestamp2 - $timestamp1) / 3600 ))

    # 返回计算结果
    echo $diff_hours
}


CURRENT_DATE=$(date +%Y%m%d%H)
OLD_BACKUPS=()
for file in ${dbName}-incremental-*.sql.zip; do
    file_date=$(echo "$file" | grep -oP "\d{10}(?=.sql.zip)")
    if [ ${#file_date} -le 1 ]; then
      continue
    fi
    echo $file_date
    difft=$(calculate_hour_diff $file_date $CURRENT_DATE )
    echo difft $difft
    if [[ difft -gt 24 ]]; then
    	echo $file  $CURRENT_DATE $file_date $((CURRENT_DATE - file_date))
        OLD_BACKUPS+=("$file")
    fi
done


# 遍历数组，打印每个文件名, 超过24小时的增量备份文件要删除
for file in "${OLD_BACKUPS[@]}"; do
    echo "$file"
    rm $file
    ossutil rm oss://$ossPath/$file
done