# Use an official Golang image as a builder
FROM golang:1.20 as builder

# Set environment variables
ENV GO111MODULE=on \
    CGO_ENABLED=0 \
    GOOS=linux \
    GOARCH=amd64

# Set the working directory inside the container
WORKDIR /app

# Copy go.mod and go.sum first to leverage Docker cache
COPY go.mod ./

# Download dependencies
RUN go mod download

# Copy the rest of the application code
COPY . .

# Build the Go application
RUN go build -o whois-daemon main.go

# Use a minimal base image to run the application
FROM alpine:3.18

# Install CA certificates for HTTPS
RUN apk add --no-cache ca-certificates

# Create a non-root user to run the app
RUN addgroup -S appgroup && adduser -S appuser -G appgroup

# Set the working directory for the runtime container
WORKDIR /app

# Copy the built application from the builder stage
COPY --from=builder /app/whois-daemon /app/

# Copy the data directory
COPY data /app/data

# Set appropriate permissions for the app directory
RUN chown -R appuser:appgroup /app

# Switch to the non-root user
USER appuser

# Expose the port the daemon runs on, replace <port> with the actual port number
EXPOSE 43

# Define the entrypoint
ENTRYPOINT ["/app/whois-daemon"]

# Optional: Define the command
CMD ["--help"]