#!/bin/bash

# Set up a Decred node.
#
# Debian or Ubuntu AMD64 (x86_64) server/VPS recommended.
#
# To use run:
# curl -L https://node.dcr.pw | bash
#
# Check it's running with:
# systemctl status dcrd
#
# Or run decred.sh to view the output of dcrd.log in real-time.

# Check permissions.
if [ "$(id -u)" != "0" ]; then
   echo "This script must be run as root."
   sudo bash "$0"
   exit
fi

# Function to log messages.
log_message() {
    echo "$(date '+%Y-%m-%d %H:%M:%S') - $1" | tee -a /var/log/decred_setup.log
}

log_message "Starting Decred node setup..."

# Set CPU architecture, Decred version, binaries archive name, and logo.
arch=$(uname -m)
case "$arch" in
    'x86_64') a='amd64';;
    'aarch64') a='arm64';;
    'armv7l') a='arm';;
    *) log_message "Unsupported architecture: $arch"; exit 1;;
esac

v='v2.0.5'
b="decred-linux-${a}-${v}.tar.gz"
l=$(base64 -d <<<"H4sIAAAAAAAAA52TP2/DIBDFd3+K2xiKL1WlLlBlSccOVdTN6lABSiKhUBmS+uM3/DPYjtqmbzIIfvf87mhgFGaNG7QIYab2D2oqOGfCi2cQ0bLIlP2gDp6V6JWEo5EKrPtwJzur/95Mlkgjn5HMFwU/DFIUfgdS9BLOD3iPj/Pfugr3uITPQWBYa5PwvMB/1QKOlLOIn8UQMhqGIdM72Dv3adlqJUM8aPrdj3AkLGuaThCL3v/p/NLRIE4pSarNY0weM7yF7ekIybfdgzNwPqiv0AvUZjeBI+eevpy6pNTb0XkLr72yFp42b9uXNdxdPta+ghoObuGcci96nYzcRHbJ/KZYIryOGVNr07D4aR9r3/iISIBPZ4Rqk+TRmtctimY4mQ6VSOc1xfpwgvtoqjvII18znD24cj7cyTWyH4GLN4RI6JUbyZAUpPkGLCU5/o4EAAA=" | gunzip)

# Show logo.
printf "%s\n\n" "$l"

# Download Decred binaries archive.
log_message "Downloading Decred binaries..."
curl -L -o "$b" "https://github.com/decred/decred-binaries/releases/download/${v}/${b}"
if [ $? -ne 0 ]; then
    log_message "Failed to download Decred binaries."
    exit 1
fi

# Extract Decred binaries.
log_message "Extracting Decred binaries..."
tar -xf "$b" --strip-components=1 -C /usr/local/bin/
if [ $? -ne 0 ]; then
    log_message "Failed to extract Decred binaries."
    exit 1
fi

# Stop existing dcrd instance if running.
if systemctl is-active --quiet dcrd.service; then
    log_message "Stopping existing dcrd service..."
    sudo systemctl stop dcrd.service
fi

# Create dcrd service.
log_message "Creating dcrd service..."
sudo bash -c 'cat > /etc/systemd/system/dcrd.service <<EOF
[Unit]
Description=dcrd

[Service]
Type=simple
ExecStart=/usr/local/bin/dcrd --appdata=/root/.dcrd
Restart=on-abnormal

[Install]
WantedBy=multi-user.target
EOF'

# Enable + (re)start service.
log_message "Enabling and starting dcrd service..."
sudo systemctl daemon-reload
sudo systemctl enable dcrd
sudo systemctl restart dcrd

# Create status script.
log_message "Creating decred.sh script..."
cat > /usr/local/bin/decred.sh <<'EOF'
#!/bin/bash
printf "%s\n\n" "$l"
sudo tail -f /root/.dcrd/logs/mainnet/dcrd.log
EOF

chmod +x /usr/local/bin/decred.sh

# Cleanup temporary files.
log_message "Cleaning up temporary files..."
rm -f "$b"

log_message "Installation complete."
printf "\n**********\nInstallation complete, enjoy your new Decred node! \nYou can monitor its status by using the decred.sh command.\n**********\n\n"