# Build Stage
FROM docker.io/library/golang:1.25-alpine AS builder

WORKDIR /app

# Copy Go module files
COPY go.mod go.sum ./

# Download Go modules
RUN go mod download

# Copy the rest of the application code
COPY . .

# Build the Go application
RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o /app/main .

# Production Stage
FROM docker.io/library/alpine:latest AS production

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

# Create non-root user
RUN addgroup -g 1000 appuser && \
    adduser -D -u 1000 -G appuser appuser

# Copy only the compiled binary from the builder stage
COPY --from=builder --chown=appuser:appuser /app/main /app/main

# Switch to non-root user
USER appuser

# Expose the port the Go application listens on
EXPOSE 8080

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
    CMD wget --no-verbose --tries=1 --spider http://localhost:8080/healthz || exit 1

# Run the Go application
CMD ["/app/main"]