# Secure Production Dockerfile with proper SSH setup
FROM golang:1.25-alpine AS builder

# Install dependencies
RUN apk add --no-cache git make gcc musl-dev

# Set working directory
WORKDIR /app

# Copy go mod files
COPY go.mod go.sum ./

# Download dependencies
RUN go mod download

# Copy source code
COPY . .

# Build Go binaries (native libs not used in Docker since NVML unavailable in Alpine)
RUN CGO_ENABLED=1 go build -o bin/api-server ./cmd/api-server/main.go && \
    CGO_ENABLED=1 go build -o bin/worker ./cmd/worker

# Final stage with Podman and secure SSH
FROM alpine:3.19

# Install runtime dependencies including Podman and SSH
RUN apk add --no-cache ca-certificates redis openssl curl podman openssh sudo gcc musl-dev

# Create app user and worker user
RUN addgroup -g 1001 -S appgroup && \
    adduser -u 1001 -S appuser -G appgroup && \
    addgroup -g 1002 -S workergroup && \
    adduser -u 1002 -S worker -G workergroup -s /bin/sh && \
    echo "worker:SecureWorkerPass2024!" | chpasswd && \
    mkdir -p /home/worker/.ssh && \
    chown -R worker:workergroup /home/worker

# Set working directory
WORKDIR /app

# Copy binaries from builder
COPY --from=builder /app/bin/ /usr/local/bin/

# Copy configs
COPY --from=builder /app/configs/ /app/configs/

# Create necessary directories
RUN mkdir -p /app/data/experiments /app/data/datasets /app/data/snapshots /app/logs /app/ssl /tmp/fetchml-jobs && \
    mkdir -p /data/active/datasets /data/active/snapshots && \
    mkdir -p /logs && \
    chown -R appuser:appgroup /app /data /logs

# Generate SSL certificates
RUN openssl req -x509 -newkey rsa:2048 -keyout /app/ssl/key.pem -out /app/ssl/cert.pem -days 365 -nodes \
    -subj "/C=US/ST=Homelab/L=Local/O=ML/OU=Experiments/CN=localhost" && \
    chmod 644 /app/ssl/cert.pem && chmod 600 /app/ssl/key.pem && \
    chown -R appuser:appgroup /app/ssl

# Generate SSH keys for worker user
RUN ssh-keygen -t rsa -b 4096 -f /home/worker/.ssh/id_rsa -N "" && \
    cp /home/worker/.ssh/id_rsa.pub /home/worker/.ssh/authorized_keys && \
    chmod 700 /home/worker/.ssh && \
    chmod 600 /home/worker/.ssh/id_rsa && \
    chmod 644 /home/worker/.ssh/id_rsa.pub /home/worker/.ssh/authorized_keys && \
    chown -R worker:workergroup /home/worker/.ssh

# Configure SSH daemon securely
RUN echo "Port 2222" >> /etc/ssh/sshd_config && \
    echo "PermitRootLogin no" >> /etc/ssh/sshd_config && \
    echo "PasswordAuthentication yes" >> /etc/ssh/sshd_config && \
    echo "PubkeyAuthentication yes" >> /etc/ssh/sshd_config && \
    echo "AuthorizedKeysFile %h/.ssh/authorized_keys" >> /etc/ssh/sshd_config && \
    echo "AllowUsers worker" >> /etc/ssh/sshd_config && \
    echo "MaxAuthTries 3" >> /etc/ssh/sshd_config && \
    echo "ClientAliveInterval 300" >> /etc/ssh/sshd_config && \
    echo "ClientAliveCountMax 2" >> /etc/ssh/sshd_config && \
    echo "X11Forwarding no" >> /etc/ssh/sshd_config && \
    echo "AllowTcpForwarding no" >> /etc/ssh/sshd_config && \
    echo "Banner /etc/ssh/banner" >> /etc/ssh/sshd_config

# Create SSH banner
RUN echo "=================================================" > /etc/ssh/banner && \
    echo "  ML Experiments Production Server" >> /etc/ssh/banner && \
    echo "  Unauthorized access is prohibited" >> /etc/ssh/banner && \
    echo "=================================================" >> /etc/ssh/banner

# Generate SSH host keys
RUN ssh-keygen -A

# Give appuser sudo permissions for SSH and worker user for Podman
RUN echo "appuser ALL=(ALL) NOPASSWD: /usr/sbin/sshd" >> /etc/sudoers && \
    echo "worker ALL=(ALL) NOPASSWD: /usr/bin/podman" >> /etc/sudoers

# Switch to app user for application
USER appuser

# Expose ports
EXPOSE 9101 2222

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
  CMD curl -k -f https://localhost:9101/health || exit 1

# Default command for API server
CMD ["/usr/local/bin/api-server", "-config", "/app/configs/api/prod.yaml"]