#!/bin/bash
set -e

# Function to extract domain from Git SSH URL
extract_domain() {
    local url=$1

    # Handle different SSH URL formats
    if [[ $url == ssh://* ]]; then
        # For URLs starting with ssh://, extract the domain
        echo "$url" | sed -E 's|ssh://[^@]+@([^:/]+).*|\1|'
    else
        # For URLs without ssh://, extract the domain after '@' and before ':'
        echo "$url" | sed -E 's|[^@]+@([^:/]+).*|\1|'
    fi
}

# Check if the required environment variables are set
if [ -z "$REPO_URL" ]; then
    echo "Error: REPO_URL environment variable must be set."
    exit 1
fi

if [ ! -f /root/.ssh/id_rsa ]; then
    echo "Error: SSH private key not found at /root/.ssh/id_rsa"
    exit 1
fi

if [ -z "$GIT_USER" ]; then
    echo "Error: GIT_USER environment variable must be set."
    exit 1
fi

if [ -z "$GIT_EMAIL" ]; then
    echo "Error: GIT_EMAIL environment variable must be set."
    exit 1
fi

# Set default package manager if not provided
PACKAGE_MANAGER=${PACKAGE_MANAGER:-npm}

# Optional Teleport setup
if [ -n "$TELEPORT_VERSION" ] && [ -n "$TELEPORT_URL" ] && [ -n "$TELEPORT_TOKEN" ]; then
    echo "Teleport configuration detected. Setting up Teleport..."

    # Set default edition if not provided
    TELEPORT_EDITION=${TELEPORT_EDITION:-oss}

    # Only install Teleport if it's not already installed
    if ! command -v teleport &> /dev/null; then
        echo "Installing Teleport version $TELEPORT_VERSION, edition $TELEPORT_EDITION..."
        curl https://goteleport.com/static/install.sh | bash -s "${TELEPORT_VERSION}" "${TELEPORT_EDITION}"
    fi

    # Create teleport configuration
    if [ ! -f /etc/teleport.yaml ]; then
        teleport configure --roles=node --token="$TELEPORT_TOKEN" --proxy="$TELEPORT_URL" --no-acme -o file
        echo "Created teleport configuration file"
    else
        echo "Teleport configuration file already exists, skipping configuration creation"
    fi

    # Get the hostname of the machine
    HOSTNAME=$(hostname)

    # Update nodename in teleport config
    sed -i "s/^  nodename:.*/  nodename: $HOSTNAME/" /etc/teleport.yaml

    # Start Teleport in the background
    echo "Starting Teleport service..."
    nohup teleport start &
else
    echo "Skipping Teleport setup - credentials not provided"
fi

# Ensure the SSH key has the correct permissions
chmod 600 /root/.ssh/id_rsa

# Extract the domain from the REPO_URL
DOMAIN=$(extract_domain "$REPO_URL")

# Add the SSH configuration for the domain
echo "Host $DOMAIN
  HostName $DOMAIN
  IdentityFile /root/.ssh/id_rsa
  StrictHostKeyChecking no
" >> /root/.ssh/config

# Clone the repository if it doesn't exist
if [ ! -d "/workspace/.git" ]; then
    git clone "$REPO_URL" /workspace
fi

# Add the public SSH key to authorized_keys
if [ -f /root/.ssh/hostkey.pub ]; then
    cat /root/.ssh/hostkey.pub >> /root/.ssh/authorized_keys
fi

# Change to the repository directory
cd /workspace

# Install dependencies using the specified package manager
case $PACKAGE_MANAGER in
    npm)
        npm install
        ;;
    yarn)
        yarn install
        ;;
    pnpm)
        pnpm install
        ;;
    bun)
        bun install
        ;;
    *)
        echo "Error: Unsupported package manager: $PACKAGE_MANAGER"
        exit 1
        ;;
esac

# Copy the environment file to the repository's environments directory
if [ -f /environment/.env ]; then
    mkdir -p /workspace/environments
    cp /environment/.env /workspace/.env
else
    echo "Warning: Environment file not found at /environment/.env"
fi

# Set the git user and email
git config --global user.name "$GIT_USER"
git config --global user.email "$GIT_EMAIL"

# Start SSH server
service ssh start

# Determine the run command
if [ -z "$RUN_COMMAND" ]; then
    # If RUN_COMMAND is not set, try to find a suitable command from package.json
    if [ -f "package.json" ]; then
        if grep -q '"dev"' package.json; then
            RUN_COMMAND="dev"
        elif grep -q '"start"' package.json; then
            RUN_COMMAND="start"
        else
            echo "Error: Could not determine a suitable run command from package.json"
            exit 1
        fi
    else
        echo "Error: package.json not found and RUN_COMMAND not set"
        exit 1
    fi
fi

# Start the application with pm2 using the specified package manager and run command
exec pm2-runtime "$PACKAGE_MANAGER run $RUN_COMMAND"