#!/bin/bash

# ============================================================================
# Make sure .venv exists and has this project installed in it.
#
# run.sh used to answer a missing venv with a message telling you to type
# "uv venv .venv && uv pip install -e '.[dev]'" yourself, and tool/tagger.py
# did not even do that -- it failed with ModuleNotFoundError: fastapi. Both
# are the same rule broken: a script owns its dependencies.
#
# Sourced or executed. Idempotent: the common case is two file tests and no
# subprocess at all, so entry points can call it unconditionally.
# ============================================================================

set -euo pipefail

ensure_venv() {
	local repo_root="$1"
	local venv="${repo_root}/.venv"
	local python="${venv}/bin/python"

	# Already good: the interpreter exists and the project imports from it.
	if [[ -x "$python" ]] && "$python" -c 'import fastapi, signal_bot' 2>/dev/null; then
		return 0
	fi

	echo "== setting up ${venv} (one-off)" >&2
	if [[ ! -x "$python" ]]; then
		if command -v uv >/dev/null; then
			uv venv "$venv"
		elif ! python3 -m venv "$venv"; then
			echo "Error: could not create a virtualenv at ${venv}" >&2
			echo "       python3 -m venv failed; on Arch: sudo pacman -S python" >&2
			return 1
		fi
	fi

	# Editable, so a later git pull updates what the tagger actually runs.
	if command -v uv >/dev/null; then
		VIRTUAL_ENV="$venv" uv pip install -e "${repo_root}[dev]"
	else
		"$python" -m pip install -e "${repo_root}[dev]"
	fi
}

# Executed rather than sourced: do the thing, for callers that are not bash.
if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
	ensure_venv "$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
fi