#!/bin/bash

set -euo pipefail

# Build the Sphinx HTML documentation.
#
# Usage: make_doc.sh [output_dir]
#   output_dir   where the rendered HTML is written (default: ./public).
#                Relative paths are resolved against the caller's working
#                directory, so the frontend build can point this at frontend/dist/docs.
#
# The Python interpreter can be overridden with $PYTHON. Otherwise the newest
# available python3.x is used (the bare "python3" is often too old).

OUT="${1:-public}"

if [ -z "${PYTHON:-}" ]; then
    for candidate in python3.13 python3.12 python3.11 python3; do
        if command -v "$candidate" >/dev/null 2>&1; then
            PYTHON="$candidate"
            break
        fi
    done
fi
if [ -z "${PYTHON:-}" ]; then
    echo "No python3 interpreter found" >&2
    exit 1
fi
echo "Using $PYTHON ($("$PYTHON" --version 2>&1))"

# Resolve the output directory to an absolute path before we change directories.
mkdir -p "$OUT"
OUT="$(cd "$OUT" && pwd)"

# Run from the repository root regardless of where the script was invoked from.
cd "$(dirname "$0")"

"$PYTHON" -m venv tmp_venv/
source tmp_venv/bin/activate

pip install -r docs/requirements.txt

sphinx-build -b html docs "$OUT"

rm -rf tmp_venv/