#!/usr/bin/env bash
set -euo pipefail

# install.sh -- install Claude Code for this user.
# Installs or updates the Claude Code binary, then writes the systemd user
# drop-in $XDG_CONFIG_HOME/environment.d/50-claude.conf, which points
# CLAUDE_CONFIG_DIR at this repo and disables Claude Code auto-memory.
# Idempotent; the drop-in takes effect on next login. Run standalone or via
# `dotfiles sync`.

# Install or update the Claude Code binary.
if command -v claude >/dev/null; then
	claude update
else
	curl -fsSL https://claude.ai/install.sh | bash
fi

# The drop-in location depends on XDG_CONFIG_HOME. When it is unset, fall back
# to ~/.config, but warn first and, when interactive, pause so the user can set
# it and re-run rather than silently landing on the default.
config_home=${XDG_CONFIG_HOME:-$HOME/.config}
if [[ -z ${XDG_CONFIG_HOME:-} ]]; then
	echo "Warning: XDG_CONFIG_HOME is unset; defaulting to $config_home." >&2
	if [[ -t 0 ]]; then
		read -rp "Set it and re-run, or Enter to use the default… "
	fi
fi

dst="$config_home/environment.d/50-claude.conf"

# Literal $HOME so systemd environment.d expands it at login.
content='CLAUDE_CONFIG_DIR=$HOME/.config/claude
CLAUDE_CODE_DISABLE_AUTO_MEMORY=1'

mkdir --parents "${dst%/*}"
if [[ -f $dst ]] && [[ $(cat "$dst") == "$content" ]]; then
	echo "$dst already up to date"
else
	printf '%s\n' "$content" >"$dst"
	echo "Installed $dst"
fi

# environment.d is read only at login: warn if the drop-in's vars are not yet
# active in this session, so the user knows to log back in.
for var in CLAUDE_CONFIG_DIR CLAUDE_CODE_DISABLE_AUTO_MEMORY; do
	if [[ -z ${!var:-} ]]; then
		echo "Log back in to load $dst into this session."
		break
	fi
done