FROM golang:1.22-alpine AS builder

# gcc is required for go-sqlite3 (CGO)
RUN apk add --no-cache gcc musl-dev

WORKDIR /app
COPY go.mod go.sum ./
RUN go mod download

COPY . .
RUN CGO_ENABLED=1 GOOS=linux go build -o breadcrumb .

# ── Runtime image ─────────────────────────────────────────────────────────────
FROM alpine:3.19
RUN apk add --no-cache ca-certificates

WORKDIR /app
COPY --from=builder /app/breadcrumb .

# Data directory for the SQLite file (mount a volume here)
RUN mkdir -p /data

EXPOSE 8080

ENTRYPOINT ["./breadcrumb"]
CMD ["-port", "8080", "-db", "/data/locations.db"]