#!/bin/bash


#### version接口
# {
#  	"version": "1.2.3",
#  	"path": "http://192.168.200.128:5212/versionFile?filename=app1.2.3",
#  	"sign": "2d28d9af69d48c964abafaff97f6e9958ecf40a9ca6d62a7ae69e00b279c22f2"
# }

mkdir -p "/data"

logFile="/data/lsyudpate.log"
maxLogSize=$((1024*1024*3))
url="http://192.168.200.128:5212/version"
versionLocal="1.0.1"

pkgUrl=""
pkgVersion=""
pkgSign=""
outPath="out.deb"


function initLog() {
	[ ! -e "$logFile" ] && return
	local size=`ls -al "$logFile" |awk '{print $5}'`
    echo $size
	[ $size -gt $maxLogSize ] && rm -rf "$logFile"
}

function freshNow() {
    nowtime=`date +"%Y-%m-%d %H:%M:%S"`
}

function get_json_value() {
    awk -v json="$1" -v key="$2" -v defaultValue="$3" 'BEGIN{
        foundKeyCount = 0
        while (length(json) > 0) {
            # pos = index(json, "\""key"\""); ## 这行更快一些，但是如果有value是字符串，且刚好与要查找的key相同，会被误认为是key而导致值获取错误
            pos = match(json, "\""key"\"[ \\t]*?:[ \\t]*");
            if (pos == 0) {if (foundKeyCount == 0) {print defaultValue;} exit 0;}
 
            ++foundKeyCount;
            start = 0; stop = 0; layer = 0;
            for (i = pos + length(key) + 1; i <= length(json); ++i) {
                lastChar = substr(json, i - 1, 1)
                currChar = substr(json, i, 1)
 
                if (start <= 0) {
                    if (lastChar == ":") {
                        start = currChar == " " ? i + 1: i;
                        if (currChar == "{" || currChar == "[") {
                            layer = 1;
                        }
                    }
                } else {
                    if (currChar == "{" || currChar == "[") {
                        ++layer;
                    }
                    if (currChar == "}" || currChar == "]") {
                        --layer;
                    }
                    if ((currChar == "," || currChar == "}" || currChar == "]") && layer <= 0) {
                        stop = currChar == "," ? i : i + 1 + layer;
                        break;
                    }
                }
            }
 
            if (start <= 0 || stop <= 0 || start > length(json) || stop > length(json) || start >= stop) {
                if (foundKeyCount == 0) {print defaultValue;} exit 0;
            } else {
                print substr(json, start, stop - start);
            }
 
            json = substr(json, stop + 1, length(json) - stop)
        }
    }'
}

# split_str "${tmp_data}" "|"
split_str_return_list=()
function split_str() {
	local str_data=$1
	local str_pattern=$2
	
	str=$str_data
	delimiter=$str_pattern
	
	array=()
	while [ "$str" ]; do
		substring="${str%%"$delimiter"*}" 
		[ -z "$substring" ] && str="${str#"$delimiter"}" && continue
		array+=( "$substring" )
		str="${str:${#substring}}"
		[ "$str" == "$delimiter" ] && break
	done
	#declare -p array
	
	split_str_return_list=()
	for var in "${array[@]}"; do
		#echo "[v]=${var}"
		split_str_return_list+=( "${var}" )
	done
}

function trimL() {
    local str=$1
    local toTrim=$2
    local dst=${str#$toTrim}
    echo $dst
}
function trimR() {
    local str=$1
    local toTrim=$2
    local dst=${str%$toTrim} 
    echo $dst
}
function trim() {
    local str=$1
    local toTrim=$2
    str=${str#$toTrim}
    local dst=${str%$toTrim} 
    echo $dst
}


function hasVersion() {
    nowtime=`date +"%Y-%m-%d %H:%M:%S"`
    echo "[$nowtime] hasVersion start" >> $logFile

    local str_ack=$(
	curl --request GET \
	  --url "$url" \
	  --header 'content-type: application/json' \
	  --data ""
	)

    nowtime=`date +"%Y-%m-%d %H:%M:%S"`
    echo "[$nowtime] hasVersion done,$str_ack" >> $logFile

    local version=$(get_json_value "$str_ack" "version" "-1")
    version=$(trim "$version" "\"")
    split_str "${version}" "."
    len=${#split_str_return_list[@]}
    if [ ! $len -eq 3 ];then
        return 0
    fi
    local v1=${split_str_return_list[0]}
    local v2=${split_str_return_list[1]}
    local v3=${split_str_return_list[2]}

    split_str "${versionLocal}" "."
    local lv1=${split_str_return_list[0]}
    local lv2=${split_str_return_list[1]}
    local lv3=${split_str_return_list[2]}

    pkgUrl=$(get_json_value "$str_ack" "path" "")
    pkgVersion=$version
    pkgSign=$(get_json_value "$str_ack" "sign" "")

    pkgUrl=$(trim "$pkgUrl" "\"")
    pkgSign=$(trim "$pkgSign" "\"")

    echo "[$nowtime] pkgVersion=$pkgVersion" >> $logFile
    echo "[$nowtime] pkgUrl=$pkgUrl" >> $logFile
    echo "[$nowtime] pkgSign=$pkgSign" >> $logFile

    [ -z "$pkgUrl" ] && echo "[$nowtime] pkgurl empty skip" >> $logFile && return 0
    [ -z "$pkgSign" ] && echo "[$nowtime] pkgSign empty skip" >> $logFile && return 0

    echo "[$nowtime] v=$v1.$v2.$v3" >> $logFile
    echo "[$nowtime] lv=$lv1.$lv2.$lv3" >> $logFile

    [ $v1 -gt $lv1 ] && return 1
    [ $v2 -gt $lv2 ] && return 1
    [ $v3 -gt $lv3 ] && return 1

	return 0
}

function main() {
	initLog

    nowtime=`date +"%Y-%m-%d %H:%M:%S"`
    echo "[$nowtime] start..." >> $logFile
	
	hasVersion
	local bUpdate=$?
	if [ $bUpdate -eq 0 ]; then 
		nowtime=`date +"%Y-%m-%d %H:%M:%S"`
        echo "[$nowtime] no need to update" >> $logFile
	   return
	fi 
    echo "[$nowtime] need update" >> $logFile

    freshNow
    rm -rf "$outPath"
    str_ack=`wget -O "$outPath" $pkgUrl`
    [ ! -e "$outPath" ] && echo "[$nowtime] $outPath not exist" >> $logFile && return

    freshNow
    local fileSign=`sha256sum "$outPath"|awk '{print $1}'`
    echo "[$nowtime] get sign,fileSign=$fileSign,$outPath" >> $logFile
    
    [ "$fileSign" != "$pkgSign" ] && echo "[$nowtime] $fileSign!=$pkgSign,$outPath skip" >> $logFile && return

    chmod +x "$outPath"
     echo "[$nowtime] start run $outPath" >> $logFile
    bash -c "./$outPath" >> $logFile
    rm -rf "$outPath"

    freshNow
    echo "[$nowtime] finish" >> $logFile
}

main