# =============================================================================
# Multi-stage Dockerfile for Embase Conference Abstract Packaging Scheduler
# Targets: .NET 8 Worker Service running on Linux
# Optimized for: Small image size, security, and production deployment
# =============================================================================

# =============================================================================
# Stage 1: Build
# Uses the full SDK image to restore packages and build the application
# =============================================================================
FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
WORKDIR /src

# Copy project files for dependency restoration
COPY ["src/EmbaseConferenceScheduler.Worker/EmbaseConferenceScheduler.Worker.csproj", "src/EmbaseConferenceScheduler.Worker/"]
COPY ["src/EmbaseConferenceScheduler.Application/EmbaseConferenceScheduler.Application.csproj", "src/EmbaseConferenceScheduler.Application/"]
COPY ["src/EmbaseConferenceScheduler.Domain/EmbaseConferenceScheduler.Domain.csproj", "src/EmbaseConferenceScheduler.Domain/"]
COPY ["src/EmbaseConferenceScheduler.Infrastructure/EmbaseConferenceScheduler.Infrastructure.csproj", "src/EmbaseConferenceScheduler.Infrastructure/"]

# Restore dependencies
# This layer is cached unless project files change - improves build performance
RUN dotnet restore "src/EmbaseConferenceScheduler.Worker/EmbaseConferenceScheduler.Worker.csproj"

# Copy all source code
COPY . .

# Build the application
WORKDIR "/src/src/EmbaseConferenceScheduler.Worker"
RUN dotnet build "EmbaseConferenceScheduler.Worker.csproj" -c Release -o /app/build

# =============================================================================
# Stage 2: Publish
# Creates a production-ready published output with optimizations
# =============================================================================
FROM build AS publish
RUN dotnet publish "EmbaseConferenceScheduler.Worker.csproj" -c Release -o /app/publish /p:UseAppHost=false

# =============================================================================
# Stage 3: Runtime
# Uses the minimal runtime image - significantly smaller than SDK
# Only contains what's needed to run the application
# =============================================================================
FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS final

# Set working directory
WORKDIR /app

# Create non-root user for security
# Running as non-root is a security best practice
RUN groupadd -r appuser && useradd -r -g appuser appuser

# Copy published application from publish stage
COPY --from=publish /app/publish .

# Create directories for runtime operations (with proper permissions)
RUN mkdir -p /app/temp /logs && chown -R appuser:appuser /app/temp /logs

# Set ownership to non-root user
RUN chown -R appuser:appuser /app

# Switch to non-root user
USER appuser

# Set environment variables
# These can be overridden at runtime via docker run -e or docker-compose
ENV DOTNET_ENVIRONMENT=Production
ENV TZ="Asia/Kolkata"

# Entry point - starts the worker service
ENTRYPOINT ["dotnet", "EmbaseConferenceScheduler.Worker.dll"]