# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Project Overview

NLP Master is a personal audio-to-text pipeline that downloads, transcribes, and summarizes Romanian NLP course lectures from cursuri.aresens.ro/curs/26. It processes ~35 MP3 files (~58 hours total) across 5 modules (6th pending).

## Architecture

Three-stage batch pipeline, all driven by a shared `manifest.json`:

1. **download.py** — Logs into the course site (credentials from `.env`), scrapes module/lecture structure, downloads MP3s to `audio/`. Updates manifest with download status. Resumable (skips existing files).

2. **transcribe.py** — Reads manifest, converts MP3→WAV (16kHz mono via ffmpeg), runs whisper.cpp (`whisper-cli.exe`) for Romanian speech-to-text. Outputs `.txt` and `.srt` to `transcripts/`. Has a quality gate after the first module. Resumable. Supports `--modules 1-3` filter.

3. **summarize.py** — Generates Claude-compatible prompts from transcripts (chunks long texts at sentence boundaries with overlap). `--compile` flag assembles all summaries into `SUPORT_CURS.md` master study guide. Summaries are in Romanian.

**setup_whisper.py** — Auto-downloads whisper.cpp (Vulkan build for AMD GPU), ffmpeg, and the Whisper model. Called by `run.bat`.

**run.bat** — Windows batch orchestrator: checks prerequisites, auto-installs missing components, creates venv, runs download→transcribe pipeline. Accepts optional module filter argument.

## Commands

```bash
# Full pipeline (Windows native)
run.bat              # download + transcribe all modules
run.bat 4-5          # transcribe only modules 4-5

# Individual steps (from venv)
python download.py                # download audio files
python transcribe.py              # transcribe all
python transcribe.py --modules 1  # transcribe module 1 only
python summarize.py               # print summary prompts to stdout
python summarize.py --compile     # compile SUPORT_CURS.md from existing summaries

# MD → PDF (from WSL2, uses .venv_pdf)
.venv_pdf/bin/python md_to_pdf.py                    # all MODUL*_*.md → summaries/pdf/
.venv_pdf/bin/python md_to_pdf.py --modules 1-3      # specific modules
.venv_pdf/bin/python md_to_pdf.py summaries/X.md     # specific file

# Setup components individually
python setup_whisper.py whisper   # download whisper.cpp binary
python setup_whisper.py model     # download Whisper model
python setup_whisper.py ffmpeg    # download ffmpeg
```

## Key Design Decisions

- **Platform split:** Scripts run on native Windows (whisper.cpp needs Vulkan GPU access). Claude Code runs from WSL2 for summaries.
- **Vulkan, not CUDA:** Hardware is AMD Radeon RX 6600M 8GB (RDNA2). whisper.cpp is built with Vulkan backend.
- **Model:** `ggml-medium-q5_0.bin` (quantized medium, fits in 8GB VRAM). Stored in `models/`.
- **manifest.json** is the shared state between all scripts — tracks download/transcribe status per lecture. Checkpointed after each file.
- **Resumability:** All scripts skip already-completed files. Safe to re-run after failures or when new modules appear.
- **Environment variables:** `COURSE_USERNAME` and `COURSE_PASSWORD` in `.env`. Optional: `WHISPER_BIN`, `WHISPER_MODEL` to override paths.

## Dependencies

Python packages (in requirements.txt): `requests`, `beautifulsoup4`, `python-dotenv`

External tools (auto-installed by run.bat/setup_whisper.py):
- whisper.cpp (whisper-cli.exe) with Vulkan support
- ffmpeg (for MP3→WAV conversion)