#!/bin/bash

set -xeuo pipefail

# -- DEFINE FUNCTIONS AND VARIABLES -- #

function steam() {
    # for systemd, so it can terminate the process (for other things sudo would have been enough)
    setpriv --reuid=steam --regid=steam --init-groups "$@" <&0
    export HOME=/opt/l4d2/steam
}

declare -A addons=(
    [Ions_Vocalizer]=698857882
    [EMS_Admin_System]=1376314661
)

function install_addon() {
    local overlay="$1"
    local addon_name="$2"
    local addon_id="${addons[${addon_name}]}"
    steam mkdir -p "/opt/l4d2/overlays/${overlay}/left4dead2/addons"
    test -f "/opt/l4d2/overlays/${overlay}/left4dead2/addons/${addon_id}.vpk" || \
        steam /opt/l4d2/steam-workshop-download "${addon_id}" --out "/opt/l4d2/overlays/${overlay}/left4dead2/addons"
}

function install_admin_system() {
    local overlay="$1"
    install_addon "${overlay}" EMS_Admin_System
    steam mkdir -p "/opt/l4d2/overlays/${overlay}/left4dead2/ems/admin system"
    steam echo "STEAM_1:0:12376499" > "/opt/l4d2/overlays/${overlay}/left4dead2/ems/admin system/admins.txt"
}

function install_tickrate_enabler() {
    local overlay="$1"
    steam mkdir -p "/opt/l4d2/overlays/${overlay}/left4dead2/addons"
    for file in tickrate_enabler.dll tickrate_enabler.so tickrate_enabler.vdf
    do
        curl -L "https://github.com/SirPlease/L4D2-Competitive-Rework/raw/refs/heads/master/addons/${file}" -o "/opt/l4d2/overlays/${overlay}/left4dead2/addons/${file}"
    done
}

# -- PREPARE SYSTEM -- #

getent passwd steam >/dev/null || useradd -M -d /opt/l4d2 -s /bin/bash steam
mkdir -p /opt/l4d2 /tmp/dumps
chown steam:steam /opt/l4d2 /tmp/dumps
dpkg --add-architecture i386
apt update
DEBIAN_FRONTEND=noninteractive apt install -y libc6:i386 lib32z1

# -- STEAM -- #

steam mkdir -p /opt/l4d2/steam
test -f /opt/l4d2/steam/steamcmd_linux.tar.gz || \
  steam wget http://media.steampowered.com/installer/steamcmd_linux.tar.gz -P /opt/l4d2/steam
test -f /opt/l4d2/steam/steamcmd.sh || \
  steam tar -xvzf /opt/l4d2/steam/steamcmd_linux.tar.gz -C /opt/l4d2/steam

# fix for: /opt/l4d2/.steam/sdk32/steamclient.so: cannot open shared object file: No such file or directory
steam mkdir -p /opt/l4d2/steam/.steam # needs to be in steam users home dir
readlink /opt/l4d2/steam/.steam/sdk32 | grep -q ^/opt/l4d2/steam/linux32$ || \
  steam ln -sf /opt/l4d2/steam/linux32 /opt/l4d2/steam/.steam/sdk32
readlink /opt/l4d2/steam/.steam/sdk64 | grep -q ^/opt/l4d2/steam/linux64$ || \
  steam ln -sf /opt/l4d2/steam/linux64 /opt/l4d2/steam/.steam/sdk64

# -- INSTALL -- #

# erst die windows deps zu installieren scheint ein workaround für x64 zu sein?
steam mkdir -p /opt/l4d2/installation
steam /opt/l4d2/steam/steamcmd.sh \
    +force_install_dir /opt/l4d2/installation \
    +login anonymous \
    +@sSteamCmdForcePlatformType windows \
    +app_update 222860 validate \
    +quit
steam /opt/l4d2/steam/steamcmd.sh \
    +force_install_dir /opt/l4d2/installation \
    +login anonymous \
    +@sSteamCmdForcePlatformType linux \
    +app_update 222860 validate \
    +quit

# -- OVERLAYS -- #

steam mkdir -p /opt/l4d2/overlays

# workshop downloader
test -f /opt/l4d2/steam-workshop-download || \
    steam wget -4 https://git.sublimity.de/cronekorkn/steam-workshop-downloader/raw/branch/master/steam-workshop-download -P /opt/l4d2
steam chmod +x /opt/l4d2/steam-workshop-download

# -- OVERLAY VANILLA -- #

steam mkdir -p /opt/l4d2/overlays/vanilla

# server config
steam mkdir -p /opt/l4d2/overlays/vanilla/left4dead2/cfg
steam cat <<'EOF' > /opt/l4d2/overlays/vanilla/left4dead2/cfg/server.cfg
motd_enabled 0

EOF

# admin system
install_addon vanilla Ions_Vocalizer
install_admin_system vanilla

# -- OVERLAY TICKRATE -- #

steam mkdir -p /opt/l4d2/overlays/tickrate

# server config
steam mkdir -p /opt/l4d2/overlays/tickrate/left4dead2/cfg
steam cat <<'EOF' > /opt/l4d2/overlays/tickrate/left4dead2/cfg/server.cfg
# https://github.com/SirPlease/L4D2-Competitive-Rework/blob/7ecc3a32a5e2180d6607a40119ff2f3c072502a9/cfg/server.cfg#L58-L69
sv_minrate 100000
sv_maxrate 100000
nb_update_frequency 0.014
net_splitpacket_maxrate 50000
net_maxcleartime 0.0001
fps_max 0
EOF

# admin system
install_tickrate_enabler tickrate

# -- OVERLAY COMPETITIVE REWORK WIP -- #

# https://github.com/SirPlease/L4D2-Competitive-Rework

steam mkdir -p /opt/l4d2/overlays/competitive_rework
steam mkdir -p /opt/l4d2/overlays/competitive_rework/left4dead2
test -d /opt/l4d2/overlays/competitive_rework/left4dead2/cfg/cfgogl || \
    curl -L https://github.com/SirPlease/L4D2-Competitive-Rework/archive/refs/heads/master.tar.gz | steam tar -xz --strip-components=1 -C /opt/l4d2/overlays/competitive_rework/left4dead2

# if ! test -f /opt/l4d2/overlays/competitive_rework/left4dead2/cfg/server_original.cfg
# then
#     steam mv /opt/l4d2/overlays/competitive_rework/left4dead2/cfg/server.cfg /opt/l4d2/overlays/competitive_rework/left4dead2/cfg/server_original.cfg
#     steam echo -e "exec server_original.cfg\nsm_forcematch zonemod" > /opt/l4d2/overlays/competitive_rework/left4dead2/cfg/server.cfg
# fi

# -- SERVERS -- #

#steam rm -rf /opt/l4d2/servers
steam mkdir -p /opt/l4d2/servers