# Use a lightweight, official Python 3.10 image as the base
FROM python:3.10-slim

# Set the working directory inside the container
WORKDIR /app

# Install critical system dependencies for audio processing
# - libsndfile1 is required by soundfile/librosa to read wav/mp3 files
# - ffmpeg is required by gTTS and Gradio for audio format conversion
# - build-essential is often needed to compile certain Python C-extensions
RUN apt-get update && apt-get install -y \
    libsndfile1 \
    ffmpeg \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# Copy the requirements file first to leverage Docker cache
COPY requirements.txt .

# Install the Python dependencies
RUN pip install --no-cache-dir -r requirements.txt

# Copy all the application files (main.py, backend.py, visualization.py) into the container
COPY . .

# Expose the port that Gradio uses by default
EXPOSE 7860

# Set environment variables for Gradio to run cleanly in Docker
# Setting SERVER_NAME to 0.0.0.0 allows external access to the container
ENV GRADIO_SERVER_NAME="0.0.0.0"
ENV GRADIO_SERVER_PORT=7860

# Command to run the application
CMD ["python", "main.py"]