# ───── Stage 1: Build the adapter binary ─────
FROM golang:1.22-alpine AS builder

RUN apk add --no-cache git make gcc musl-dev

WORKDIR /src
COPY . .

RUN go mod tidy
RUN make

# Verify binary
RUN ls -la postgresql-prometheus-adapter && \
    ./postgresql-prometheus-adapter --help > /dev/null


# ───── Stage 2: Runtime (Alpine for glibc/loader) ─────
FROM alpine:3.20

RUN apk add --no-cache libc6-compat bash  # bash for start.sh, libc for binary

# Copy binary
COPY --from=builder /src/postgresql-prometheus-adapter /usr/local/bin/postgresql-prometheus-adapter
RUN chmod +x /usr/local/bin/postgresql-prometheus-adapter

# Copy and make start.sh executable
COPY start.sh /usr/local/bin/start.sh
RUN chmod +x /usr/local/bin/start.sh

# Non-root user
RUN addgroup -g 1001 -S appgroup && \
    adduser -S -D -H -u 1001 -h /home/app -s /bin/bash -G appgroup -g appuser appuser
USER appuser

WORKDIR /home/app

EXPOSE 9201

HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD wget --no-verbose --tries=1 --spider http://localhost:9201/health || exit 1

ENTRYPOINT ["/usr/local/bin/start.sh"]