### SYSTEM GENERATED FILE, MAKE CHANGES AS NEEDED ###

# Use a specific version as the base image for the builder stage
FROM node:20-alpine AS builder

# Set /app as the working directory in the builder stage
WORKDIR /app

### UNCOMMENT AS NEEDED ###
# Copy package.json and package-lock.json into the builder stage
# This allows the dependencies to be installed before copying the rest of the application code
COPY package*.json ./

### DEFAULT BOOTSTRAP BUILD CODE, RUN LOCALLY TO GENERATE package.json ###
# If package.json exists and not empty, install the listed packages
# If it doesn't exist or is empty, print a message and skip the installation
RUN if [ -s package.json ]; then \
    npm ci --omit=dev \
    else \
        echo "No package.json found or file is empty, skipping installation"; \
    fi

# Copy the rest of the application code into the builder stage
COPY . /app

# Start a new stage with a distroless image for smaller image size and improved security
FROM gcr.io/distroless/nodejs18-debian11

# Copy the /app directory from the builder stage into the current stage
# This includes the application code and the installed packages
COPY --from=builder /app /app

# Set /app as the working directory in the current stage
WORKDIR /app

# Set the command to run when the container starts
# This will start the application by running index file
CMD [ "index.js" ]