FROM golang:1.23-alpine AS builder

WORKDIR /app

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

# Copy the rest of the code
COPY . .

# Build the application
RUN go build -o app ./cmd/main.go

# Use a minimal alpine image for the final container
FROM alpine:latest

# Install necessary packages
RUN apk --no-cache add ca-certificates netcat-openbsd

WORKDIR /app

# Copy the pre-built binary from the builder stage
COPY --from=builder /app/app .

# Copy source code and tests for testing
COPY --from=builder /app/pkg ./pkg
COPY --from=builder /app/api ./api
COPY --from=builder /app/tests ./tests
COPY --from=builder /app/scripts ./scripts
COPY --from=builder /app/go.mod ./go.mod
COPY --from=builder /app/go.sum ./go.sum

# Copy the Go binary and environment for tests
COPY --from=builder /usr/local/go /usr/local/go
ENV PATH="/usr/local/go/bin:${PATH}"
ENV GOPATH="/go"

# Set environment variables
ENV GO_ENV=production

# Expose the application port
EXPOSE 8080

# Command to run the application
CMD ["./app"]