#!/usr/bin/env bash
###
### arching-kaos-tools
### Tools to interact and build an Arching Kaos Infochain
### Copyright (C) 2021 - 2025  kaotisk
###
### This program is free software: you can redistribute it and/or modify
### it under the terms of the GNU General Public License as published by
### the Free Software Foundation, either version 3 of the License, or
### (at your option) any later version.
###
### This program is distributed in the hope that it will be useful,
### but WITHOUT ANY WARRANTY; without even the implied warranty of
### MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
### GNU General Public License for more details.
###
### You should have received a copy of the GNU General Public License
### along with this program.  If not, see <http://www.gnu.org/licenses/>.
###

source $AK_LIBDIR/_ak_log
source $AK_LIBDIR/_ak_network
rust_sh_install_url="https://sh.rustup.rs"
cjdns_src_git_repo_url="https://github.com/cjdelisle/cjdns"
cjdnstoolspath="$HOME/cjdns/tools"
cargo_env="$HOME/.cargo/env"

_ak_cjdns_check_availability(){
    declare -a cjdns_bins=("cjdroute" "makekeys" "mkpasswd" "privatetopublic" "publictoip6" "randombytes" "sybilsim")
    for cbin in "${cjdns_bins[@]}"
    do
        which $cbin > /dev/null 2>&1
        if [ $? -ne 0 ]
        then
            _ak_log_error "$cbin not found"
            exit 1
        else
            _ak_log_info "$cbin found"
        fi
    done
}

_ak_cargo_rust_check_install(){
    if [ ! -f $cargo_env ]
    then
        curl --proto '=https' --tlsv1.2 -sSf $rust_sh_install_url | sh
    fi
    source $cargo_env
}

_ak_cjdns_install(){
    _ak_cargo_rust_check_install
    git clone $cjdns_src_git_repo_url
    cd cjdns
    sh do
    if [ $? -ne 0 ]
    then
        _ak_log_error "Failed to compile cjdns"
        exit 1
    fi
    cd ..
    sudo cp cjdns/cjdroute /usr/bin/cjdroute
    sudo cp cjdns/target/release/makekeys /usr/bin/makekeys
    sudo cp cjdns/target/release/mkpasswd /usr/bin/mkpasswd
    sudo cp cjdns/target/release/privatetopublic /usr/bin/privatetopublic
    sudo cp cjdns/target/release/publictoip6 /usr/bin/publictoip6
    sudo cp cjdns/target/release/randombytes /usr/bin/randombytes
    sudo cp cjdns/target/release/sybilsim /usr/bin/sybilsim
    ln -s "$(realpath cjdns/tools/dumpLinks)" $HOME/.arching-kaos/bin/dumpLinks
    ln -s "$(realpath cjdns/tools/cexec)" $HOME/.arching-kaos/bin/cjdns-cexec
    ln -s "$(realpath cjdns/tools/peerStats)" $HOME/.arching-kaos/bin/peerStats
    which systemctl 2> /dev/null 1>&2
    if [ $? -ne 0 ]
    then
        _ak_log_error "Systemctl not found... TODO"
    else
        sudo cp "$(realpath cjdns/contrib/systemd/cjdns.service)" /etc/systemd/system/cjdns.service
        sudo cp "$(realpath cjdns/contrib/systemd/cjdns-resume.service)" /etc/systemd/system/cjdns-resume.service
        sudo systemctl enable --now cjdns.service
    fi
}

_ak_cjdns_read_peers_to_vars_with_jq(){
    totalpeers="$(jq '. | length' < $peersfile)"
    number="0"
    interface="0"

    while [ $number -lt $totalpeers ]
    do
        address="$(jq -r '.['$number'].address' < $peersfile)"
        login="$(jq -r '.['$number'].login' < $peersfile)"
        password="$(jq -r '.['$number'].password' < $peersfile)"
        publicKey="$(jq -r '.['$number'].publicKey' < $peersfile)"
        peerName="$(jq -r '.['$number'].peerName' < $peersfile)"
        if [ $(echo $address | grep '\[') ]
        then
            interface="1"
        else
            interface="0"
        fi
        $cjdnstoolspath/cexec 'UDPInterface_beginConnection("'$publicKey'", "'$address'", "'$peerName'", "'$password'", "'$login'", '$interface')'
        number="$(( $number + 1 ))"
    done
}

_ak_cjdns_read_peers_to_vars_natively(){
    number=-1
    cat $peersfile | tr -d $'\n' | sed -e 's/]$/\n/g' | tr -d ' ' | sed -e 's/"//g; s/,/,\n/g; s/}//g; s/,//g' | while read line
    do
        if [ $(echo "$line" | grep '{') ]
        then
            number=$(($number + 1))
            if [ $number -ne 0 ]
            then
                printf '\n' >> peerfile
            fi
        fi
        if [ $(echo "$line" | grep 'address') ]
        then
            printf '%s ' "$(echo -n $line | cut -d ':' -f 2-)" >> peerfile
        fi
        if [ $(echo "$line" | grep 'password') ]
        then
            printf '%s ' "$(echo -n $line | cut -d ':' -f 2-)" >> peerfile
        fi
        if [ $(echo "$line" | grep 'publicKey') ]
        then
            printf '%s ' "$(echo -n $line | cut -d ':' -f 2-)" >> peerfile
        fi
        if [ $(echo "$line" | grep 'login') ]
        then
            printf '%s ' "$(echo -n $line | cut -d ':' -f 2-)" >> peerfile
        fi
        if [ $(echo "$line" | grep 'peerName') ]
        then
            printf '%s ' "$(echo -n $line | cut -d ':' -f 2-)" >> peerfile
        fi
    done
    printf '\n' >> peerfile
    cat peerfile | while read address login password publicKey peerName
    do
        if [ $(echo $address | grep '\[') ]
        then
            interface="1"
        else
            interface="0"
        fi
        $cjdnstoolspath/cexec 'UDPInterface_beginConnection("'$publicKey'", "'$address'", "'$peerName'", "'$password'", "'$login'", '$interface')'
    done
    rm peerfile
}


_ak_cjdns_connect_peers(){
    _ak_network_cjdns_connect
    exit $?
    #
    # Peers file have to look like this:
    #
    # [
    #   {
    #     "address": "<IPv4|IPv6>:<port>",
    #     "login": "<login-name>",
    #     "password": "<password...>",
    #     "publicKey": "<publickey with .k suffix>",
    #     "peerName": "<peername>"
    #   },
    #   { ... } <- more peers
    # ]
    #
    # You can have both IPv4 and IPv6 peers on the same file
    #
    # Assumes there is ~/cjdns/tools/cexec in place, change it below
    #
    if [ ! -z $1 ] && [ -n "$1" ] && [ -f $1 ]
    then
        peersfile="$1"
    else
        echo "Usage: $(basename $0) <json-peer-list-file>"
        exit 1
    fi
    if command -v jq
    then
        _ak_cjdns_read_peers_to_vars_with_jq
    else
        _ak_cjdns_read_peers_to_vars_natively
    fi
}

_ak_cjdns_get_ip(){
    which ip > /dev/null 2>&1
    if [ $? -ne 0 ]
    then
        _ak_log_error "You need ip tool installed"
        exit 2
    fi
    ip a | \
        grep 'inet6 *fc' | \
        awk '{print $2}' | \
        cut -d'/' -f1
}