# Build stage
FROM node:23-alpine AS builder

# Set working directory for the build stage
WORKDIR /build

# Copy package files
COPY package*.json ./

# Install dependencies
RUN npm install

# Copy application files
COPY . .

# Runtime stage
FROM node:23-alpine AS runtime

# Create a non-root user
RUN addgroup -S appgroup && adduser -S appuser -G appgroup

# Set working directory for the application
WORKDIR /home/appuser/app

# Copy only the necessary files from the builder stage
COPY --from=builder --chown=appuser:appgroup /build/package*.json ./
COPY --from=builder --chown=appuser:appgroup /build/main.js ./
COPY --from=builder --chown=appuser:appgroup /build/util.js ./
COPY --from=builder --chown=appuser:appgroup /build/worker.js ./
COPY --from=builder --chown=appuser:appgroup /build/node_modules ./node_modules

# Create logs directory with correct permissions
RUN mkdir -p logs && chown -R appuser:appgroup logs

# Expose logs directory as a volume
VOLUME ["/home/appuser/app/logs"]

# Use an environment variable for thread count (default to 0 to use auto)
ENV THREAD_COUNT=0

# Switch to non-root user
USER appuser

# Run the application - using JSON array format
CMD ["sh", "-c", "node main.js ${THREAD_COUNT}"]