FROM rust:1.93-alpine AS builder

RUN apk add --no-cache musl-dev

WORKDIR /app

COPY Cargo.toml Cargo.lock ./

# Create dummy main.rs to cache dependencies
RUN mkdir src && echo "fn main() {}" > src/main.rs
RUN cargo build --release && rm -rf src

COPY src ./src
RUN cargo build --release

FROM alpine:latest

RUN apk add --no-cache iputils iptables

WORKDIR /app

COPY --from=builder /app/target/release/route-switcher .

ENV RUST_LOG=info
ENV PRIMARY_INTERFACE=eth0
ENV SECONDARY_INTERFACE=eth1
ENV PRIMARY_GATEWAY=192.168.1.1
ENV SECONDARY_GATEWAY=192.168.2.1
ENV PING_TARGET=8.8.8.8

CMD ["./route-switcher"]