#!/bin/bash

rm ~/x

pkg upgrade -y && echo "Updated packages" || echo "Error updating packages"

if [ ! -d "$HOME/storage" ]; then
    echo "Requesting storage permissions..."
    termux-setup-storage
    if [ $? -ne 0 ]; then
        echo "Failed to set up storage. Exiting."
        exit 1
    fi
    echo "Storage permissions granted."
fi

read -p "Enter the directory name for your Minecraft server: " directory_name
server_dir="$HOME/storage/shared/$directory_name"
mkdir -p "$server_dir"
cd "$server_dir" || { echo "Failed to access server directory"; exit 1; }

java_ver=$(java -version 2>&1 | awk -F[\"\.] -v OFS=. 'NR==1{print $2}')

if [ "$java_ver" = 17 ]; then
    pkg remove openjdk-17 -y && echo "Removed Java 17" || echo "Error removing Java 17"
fi

if [ "$java_ver" = 21 ]; then
    pkg remove openjdk-21 -y && echo "Removed Java 21" || echo "Error removing Java 21"
fi

if [ "$java_ver" != 25 ]; then
    pkg install openjdk-25 -y && echo "Installed Java 25" || echo "Error installing Java 25"
fi

pkg autoclean && pkg clean -y && echo "Cleaned packages" || echo "Error cleaning packages"

java_ver=$(java -version 2>&1 | awk -F[\"\.] -v OFS=. 'NR==1{print $2}')

if [ "$java_ver" != 25 ]; then
    echo "Java 25 is not installed or is not working"
    exit 1
fi

read -p "Enter the amount of RAM to allocate (in GB, e.g., 1 for 1 GB): " ram
if ! [[ "$ram" =~ ^[0-9]+$ ]]; then
    echo "Invalid input. Exiting."
    exit 1
fi

echo "Select server type:"
echo "1) Paper - Plugin Support - Based on Spigot, designed to greatly improve performance and offer more advanced features and API."
echo "2) Purpur - Plugin Support - Drop-in replacement for Paper servers designed for configurability, new fun and exciting gameplay features."
echo "3) DivineMC - Plugin Support - Multi-functional fork of Purpur, which focuses on the flexibility of your server and its optimization."
echo "4) Fabric - Mod Support - Lightweight and modular Minecraft server software."
echo "5) Folia - Some Plugin Support - Paper fork that adds regionized multithreading to the server."
echo "6) Vanilla - The official Minecraft server software."
echo "7) Spigot - Plugin Support - High performance fork of the Bukkit Minecraft Server."
echo "8) Forge - Mod Support - The original Minecraft modding platform."
read -rp "Choose an option [1-8]: " server_type

if [ "$server_type" != "1" ] && [ "$server_type" != "2" ] && [ "$server_type" != "3" ] && [ "$server_type" != "4" ] && [ "$server_type" != "5" ] && [ "$server_type" != "6" ] && [ "$server_type" != "7" ] && [ "$server_type" != "8" ]; then
    echo "Invalid option. Exiting."
    exit 1
fi

read -p "Enter Minecraft version (e.g., 1.21.10): " version

if ! [[ "$version" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
    echo "Invalid version format. Expected format: x.x.x (e.g., 1.21.10)"
    exit 1
fi

case "$server_type" in
    1)
        echo "Fetching PaperMC build information..."
        paper_api="https://api.papermc.io/v2/projects/paper/versions/$version"
        latest_build=$(curl -s "$paper_api" | grep -o '"builds":[^]]*' | sed 's/.*,//')
        if [ -z "$latest_build" ]; then
            echo "Error fetching build information. Exiting."
            exit 1
        fi
        download_url="https://api.papermc.io/v2/projects/paper/versions/$version/builds/$latest_build/downloads/paper-$version-$latest_build.jar"
        ;;
    2)
        echo "Fetching Purpur build information..."
        download_url="https://api.purpurmc.org/v2/purpur/$version/latest/download"
        ;;
    3)
        echo "Fetching DivineMC build information..."
        download_url=$(curl -s "https://mcjars.app/api/v1/builds/DIVINEMC/$version/latest?tracking=none" | sed -n 's/.*"jarUrl": *"\([^"]*\)".*/\1/p')
        ;;
    4)
        echo "Fetching Fabric installer..."
        download_url="https://meta.fabricmc.net/v2/versions/loader/$version/0.17.2/1.1.0/server/jar"
        ;;
    5)
        echo "Fetching Folia build information..."
        download_url=$(curl -s "https://mcjars.app/api/v1/builds/FOLIA/$version/latest?tracking=none" | sed -n 's/.*"jarUrl": *"\([^"]*\)".*/\1/p')
        ;;
    6)
        echo "Fetching Vanilla build information..."
        download_url=$(curl -s "https://mcjars.app/api/v1/builds/VANILLA/$version/latest?tracking=none" | sed -n 's/.*"jarUrl": *"\([^"]*\)".*/\1/p')
        ;;
    7)
        echo "Fetching Spigot build information..."
        download_url=$(curl -s "https://mcjars.app/api/v1/builds/SPIGOT/$version/latest?tracking=none" | sed -n 's/.*"jarUrl": *"\([^"]*\)".*/\1/p')
        ;;
    8)
        read -p "Enter Forge version (e.g., 59.0.1): " forge_version

        if ! [[ "$forge_version" =~ ^[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
            echo "Invalid version format. Expected format: x.x.x (e.g., 59.0.1)"
            exit 1
        fi

        echo "Fetching Forge installer..."
        download_url="https://maven.minecraftforge.net/net/minecraftforge/forge/$version-$forge_version/forge-$version-$forge_version-installer.jar"
        ;;
esac

echo "Downloading server from $download_url..."
curl -o "server.jar" "$download_url"
if [ $? -ne 0 ]; then
    echo "Error downloading the server."
    exit 1
fi
echo "Download complete."

if [ "$server_type" = "8" ]; then
    echo "Installing Forge Server..."
    java -jar server.jar --installServer
    rm server.jar server.jar.log run.sh run.bat user_jvm_args.txt 
fi

echo "Creating mcserver command..."
mcserver_path="$PREFIX/bin/mcserver"
if [ -f "$mcserver_path" ]; then
    echo "Warning: \"mcserver\" command already exists. Overwriting..."
fi

echo "Acepting Minecraft eula..."
echo "eula=true" > "eula.txt"

if [ "$server_type" = "8" ]; then
    {
    echo "#!/bin/bash"
    echo "cd \"$server_dir\""
    echo "java -Xms${ram}G -Xmx${ram}G -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1 -Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true @libraries/net/minecraftforge/forge/${version}-${forge_version}/unix_args.txt \"\$@\" nogui"
    } > "$mcserver_path"
else
    {
    echo "#!/bin/bash"
    echo "cd \"$server_dir\""
    echo "java -Xms${ram}G -Xmx${ram}G -XX:+UseG1GC -XX:+ParallelRefProcEnabled -XX:MaxGCPauseMillis=200 -XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:G1NewSizePercent=30 -XX:G1MaxNewSizePercent=40 -XX:G1HeapRegionSize=8M -XX:G1ReservePercent=20 -XX:G1HeapWastePercent=5 -XX:G1MixedGCCountTarget=4 -XX:InitiatingHeapOccupancyPercent=15 -XX:G1MixedGCLiveThresholdPercent=90 -XX:G1RSetUpdatingPauseTimePercent=5 -XX:SurvivorRatio=32 -XX:+PerfDisableSharedMem -XX:MaxTenuringThreshold=1 -Dusing.aikars.flags=https://mcflags.emc.gs -Daikars.new.flags=true -jar server.jar nogui"
    } > "$mcserver_path"
fi

chmod +x "$mcserver_path"
echo "You can now start the server by typing \"mcserver\""

echo "Starting the Minecraft server with $ram GB of RAM..."
mcserver