#!/bin/bash

filePath="/var/log/nginx/"
fileCountRetention=4
fileSizeLimit=5M

vFound=0
for fsName in $(find ${filePath} -type f -and -name "*.log" -and -size +${fileSizeLimit}); do
        vFound=1
        echo "[$(date +'%F %H:%M:%S')] - Found ${fsName} with size over ${fileSizeLimit}"
        echo "[$(date +'%F %H:%M:%S')] - Renaming ${fsName} to ${fsName}.1"
        mv ${fsName} ${fsName}.1
        for (( cur=${fileCountRetention}; cur>0; cur-- )); do
                if [[ ${cur} -gt 1 ]]; then
                        let prev=${cur}-1
                        prevExt=".${prev}.gz"
                        curExt=".${cur}.gz"

                        if [[ ${cur} -eq ${fileCountRetention} ]] && [[ -f "${fsName}${curExt}" ]]; then
                                echo "[$(date +'%F %H:%M:%S')] - Removing ${fsName}${curExt}"
                                rm -f "${fsName}${curExt}"
                                mv "${fsName}${prevExt}" "${fsName}${curExt}"
                        else
                                if [[ -f "${fsName}${prevExt}" ]]; then
                                        echo "[$(date +'%F %H:%M:%S')] - Renaming ${fsName}${prevExt} to ${fsName}${curExt}"
                                        mv "${fsName}${prevExt}" "${fsName}${curExt}"
                                else
                                        echo "[$(date +'%F %H:%M:%S')] - ${fsName}${prevExt} not found"
                                fi
                        fi
                fi
        done
done

if [[ ${vFound} -gt 0 ]]; then
        echo "[$(date +'%F %H:%M:%S')] - Reopening nginx log files"
        nginx -s reopen
fi

for fsName in $(find ${filePath} -type f -and -name "*.log.1"); do
        echo "[$(date +'%F %H:%M:%S')] - Compressing ${fsName}"
        gzip -9 ${fsName}
done