#!/bin/bash
basedir=".."
outputdir="output/dnsmasq"
path="${basedir}/cache_domains.json"

export IFS=' '

test=$(which jq);
if [ $? -gt 0 ] ; then
    echo "This script requires jq to be installed."
    echo "Your package manager should be able to find it"
    exit 1
fi

cachenamedefault="disabled"
combinedoutput=$(jq -r ".combined_output" config.json)

while read -r line; do
        ip=$(jq ".ips[\"${line}\"]" config.json)
        declare "cacheip${line}"="${ip}"
done <<< $(jq -r '.ips | to_entries[] | .key' config.json)

while read -r line; do
        name=$(jq -r ".cache_domains[\"${line}\"]" config.json)
        declare "cachename${line}"="${name}"
done <<< $(jq -r '.cache_domains | to_entries[] | .key' config.json)

rm -rf ${outputdir}
mkdir -p ${outputdir}
while read -r entry; do
    unset cacheip
    unset cachename
    key=$(jq -r ".cache_domains[${entry}].name" ${path})
    cachename="cachename${key}"
    if [ -z "${!cachename}" ]; then
        cachename="cachenamedefault"
    fi
    if [[ ${!cachename} == "disabled" ]]; then
        continue;
    fi
    cacheipname="cacheip${!cachename}"
    cacheip=$(jq -r 'if type == "array" then .[] else . end' <<< ${!cacheipname} | xargs)
    while read -r fileid; do
        while read -r filename; do
            destfilename=$(echo ${filename} | sed -e 's/txt/conf/')
            outputfile=${outputdir}/${destfilename}
            touch ${outputfile}
            while read -r fileentry; do
                # Ignore comments, newlines and wildcards
                if [[ ${fileentry} == \#* ]] || [[ -z ${fileentry} ]]; then
                        continue
                fi
                parsed=$(echo ${fileentry} | sed -e "s/^\*\.//")
                for i in ${cacheip}; do
                    if ! grep -qx "address=/${parsed}/${i}" "${outputfile}"; then
                        echo "address=/${parsed}/${i}" >> "${outputfile}"
                    fi
                    if ! grep -qx "local=/${parsed}/" "${outputfile}"; then
                        echo "local=/${parsed}/" >> "${outputfile}"
                    fi
                done
            done <<< $(cat ${basedir}/${filename} | sort);
        done <<< $(jq -r ".cache_domains[${entry}].domain_files[$fileid]" ${path})
    done <<< $(jq -r ".cache_domains[${entry}].domain_files | to_entries[] | .key" ${path})
done <<< $(jq -r '.cache_domains | to_entries[] | .key' ${path})

if [[ ${combinedoutput} == "true" ]]; then
    for file in ${outputdir}/*; do f=${file//${outputdir}\/} && f=${f//.conf} && echo "# ${f^}" >> ${outputdir}/lancache.conf && cat ${file} >> ${outputdir}/lancache.conf && rm ${file}; done
fi

cat << EOF
Configuration generation completed.

Please copy the following files:
- ./${outputdir}/*.conf to /etc/dnsmasq/dnsmasq.d/
EOF