#!/usr/bin/env bash

trap 'exit 130' INT

# Function to check if required domains are accessible
check_domains() {
    echo "Checking necessary domains..."
    for domain in "github.com" "api.github.com" "dl.gitea.io" "raw.githubusercontent.com"; do
        if ! ping -c1 "$domain" &>"/dev/null"; then
            echo "Unable to access $domain. Installation cannot proceed."
            exit 1
        fi
    done
}

# Function to install Gitea
install_gitea() {
    echo "Installing Gitea..."

    # Check if curl is installed
    if ! command -v curl &>/dev/null; then
        echo "Installing curl..."
        sudo apt install -y curl || { echo "Failed to install curl. Exiting."; exit 1; }
    fi

    # Get latest Gitea version
    VER=$(curl --silent "https://api.github.com/repos/go-gitea/gitea/releases/latest" | grep '"tag_name":' | sed -E 's/.*"([^"]+)".*/\1/' | sed 's|[v,]||g')

    # Install git
    echo "Installing git..."
    sudo apt-get install git -y || { echo "Failed to install git. Exiting."; exit 1; }

    # Create git user
    echo "Creating git user..."
    sudo adduser --system --shell /bin/bash --gecos 'Git Version Control' --group --disabled-password --home /home/git git

    # Download and install Gitea binary
    echo "Downloading Gitea binary..."
    case "$(uname -m)" in
        i386)
            arch="386"
            ;;
        x86_64)
            arch="amd64"
            ;;
        armv6l)
            arch="arm-6"
            ;;
        armv7l)
            arch="arm-7"
            ;;
        *)
            echo "Unsupported architecture"
            exit 1
            ;;
    esac

    gitea_url="https://dl.gitea.io/gitea/$VER/gitea-$VER-linux-$arch"
    echo "Downloading Gitea from: $gitea_url"
    sudo curl -fsSL -o "/tmp/gitea" "$gitea_url"
    sudo mv /tmp/gitea /usr/local/bin
    sudo chmod +x /usr/local/bin/gitea

    # Create necessary directories and files
    echo "Setting up directories and files..."
    sudo mkdir -p /var/lib/gitea/{custom,data,log}
    sudo chown -R git:git /var/lib/gitea
    sudo chmod -R 750 /var/lib/gitea
    sudo mkdir -p /etc/gitea
    sudo chown root:git /etc/gitea
    sudo chmod 770 /etc/gitea

    # Configure systemd service
    echo "Configuring systemd service..."
    sudo curl -fsSL -o /etc/systemd/system/gitea.service https://raw.githubusercontent.com/go-gitea/gitea/master/contrib/systemd/gitea.service
    sudo systemctl daemon-reload
    sudo systemctl enable --now gitea

    # Allow port through firewall
    echo "Allowing port 3000 through firewall..."
    sudo ufw allow 3000

    # Get public and internal IP addresses
    public_ip=$(curl -sS --connect-timeout 10 -m 60 https://ipv4.icanhazip.com/ || curl -sS --connect-timeout 10 -m 60 https://api.ipify.org )
    internal_ip=$(ip addr | grep -E -o '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | grep -E -v "^127\.|^255\.|^0\." | head -n 1)

    # Output installation information
    echo -e "=================================================================="
    echo "Gitea has been installed successfully!"
    echo "The Gitea web interface should be available at:"
    echo "http://$internal_ip:3000"
    echo "Or, if you are using a VPS, at:"
    echo "http://$public_ip:3000"
    echo "=================================================================="
}

# Main script
# Automate installation by assuming yes to the prompt
check_domains
install_gitea

exit 0