# Use the official Rust image as a base
FROM rust:bookworm as builder

# Set the working directory
WORKDIR /app

# Install system dependencies
RUN apt-get update && apt-get install -y \
    pkg-config \
    libssl-dev \
    # Add any other dependencies required by your project
    # For example, if you use postgres/mysql/sqlite, you might need libpq-dev, libmysqlclient-dev, libsqlite3-dev
    && rm -rf /var/lib/apt/lists/*

# Copy the Cargo.toml and Cargo.lock first to leverage Docker cache
# This layer only rebuilds if dependencies change
COPY Cargo.toml Cargo.lock ./

# Create a dummy src directory and main.rs to build dependencies
# This caches the dependency build
RUN mkdir -p src && echo "fn main() {println!(\"hello world\");}" > src/main.rs
# Build dependencies
RUN cargo build --release && rm -rf src

# Copy the actual source code
COPY . .

# Build the release binary
RUN cargo build --release

# --- Start a new stage for a smaller final image ---
FROM debian:bookworm-slim

# Set the working directory
WORKDIR /app

# Install runtime dependencies if any
# For example, if your Rust application dynamically links to OpenSSL, you might need libssl3
RUN apt-get update && apt-get install -y \
    libssl3 \
    # Add any other runtime dependencies here
    && rm -rf /var/lib/apt/lists/*

# Copy the built binary from the builder stage
COPY --from=builder /app/target/release/employee-tracking-backend .

# Expose the port your application listens on
EXPOSE 3000

# Set the entrypoint command to run your application
CMD ["./employee-tracking-backend"]