FROM golang:1.20-alpine AS builder

WORKDIR /app

# Copy go module files first to leverage Docker cache
COPY go.mod go.sum ./
RUN go mod download

# Copy the source code
COPY . .

# Build the application
RUN CGO_ENABLED=0 GOOS=linux go build -o voxpop-backend .

# Create a minimal production image
FROM alpine:latest

WORKDIR /app

# Copy the binary from the builder stage
COPY --from=builder /app/voxpop-backend .

# Expose port 3000
EXPOSE 3000

# Set environment variables
ENV GIN_MODE=release

# Run the application
CMD ["./voxpop-backend"]