# Use an official Python runtime as a parent image
# Using a specific version like 3.10 or 3.11 is recommended over 'latest'
FROM python:3.10-slim

# Set the working directory in the container
WORKDIR /app

# Install system dependencies if needed (e.g., build tools) - add if required later
# RUN apt-get update && apt-get install -y --no-install-recommends some-package && rm -rf /var/lib/apt/lists/*

# Copy the requirements file into the container
COPY requirements.txt .

# Install Python dependencies
# --no-cache-dir reduces image size
RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt

# Copy the rest of the application code into the container
COPY . .

# Expose the port the app runs on
# This informs Docker that the container listens on this port
EXPOSE 7860

# Define the command to run the application
# Use 0.0.0.0 to listen on all network interfaces inside the container
# Uvicorn will listen on the port defined by the $PORT env var (7860)
CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "7860"]