# Start with a Go base image
FROM golang:1.21-bullseye as builder

# Install dependencies for cross-compilation
RUN apt-get update && apt-get install -y \
    gcc-aarch64-linux-gnu \
    libc6-dev-arm64-cross \
    && rm -rf /var/lib/apt/lists/*

# Set up working directory
WORKDIR /app

# Copy go.mod and go.sum files first for better caching
COPY go.mod ./
# COPY go.sum ./ # Uncomment if you have a go.sum file

# Download dependencies
RUN go mod download

# Copy the source code
COPY . .

# Set environment variables for cross-compilation to ARM64 (Raspberry Pi 4)
ENV GOOS=linux
ENV GOARCH=arm64
ENV CC=aarch64-linux-gnu-gcc
ENV CGO_ENABLED=1

# Build the application
RUN go build -o track-gopher-arm64 ./examples/main.go

# Create a minimal runtime image
FROM arm64v8/debian:bullseye-slim

# Install required runtime dependencies
RUN apt-get update && apt-get install -y \
    ca-certificates \
    && rm -rf /var/lib/apt/lists/*

# Set up working directory
WORKDIR /app

# Copy the binary from the builder stage
COPY --from=builder /app/track-gopher-arm64 .

# Make the binary executable
RUN chmod +x ./track-gopher-arm64

# Command to run when the container starts
ENTRYPOINT ["./track-gopher-arm64"]