# Multi-stage Dockerfile for Rust backend
FROM rust:1.90-alpine as builder

# Install build dependencies
RUN apk add --no-cache \
    musl-dev \
    pkgconfig \
    openssl-dev \
    clang

# Set working directory
WORKDIR /app

# Copy Cargo files for dependency caching
COPY Cargo.toml Cargo.lock ./

# Create a dummy main.rs to build dependencies
RUN mkdir src && echo "fn main() {}" > src/main.rs

# Build dependencies (cached layer)
RUN cargo build --release && rm -rf src/

# Copy source code
COPY src/ src/
COPY migrations/ migrations/

# Build the application
RUN cargo build --release

# Runtime stage
FROM alpine:latest

# Install runtime dependencies
RUN apk add --no-cache ca-certificates curl

# Copy the binary from builder stage
COPY --from=builder /app/target/release/backend /usr/local/bin/app

# Expose port
EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
    CMD curl -f http://localhost:3000/health || exit 1

# Run the application
CMD ["app"]