#!/usr/bin/env bash
# install-systemd.sh — Install claude-sessions systemd user service.
#
# Copies the service file from this repo into ~/.config/systemd/user/,
# reloads the daemon, and enables + starts the service.
#
# Safe to re-run (idempotent).

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_DIR="$(dirname "$SCRIPT_DIR")"
SRC="$REPO_DIR/config/systemd/user/claude-sessions-save.service"
DST_DIR="$HOME/.config/systemd/user"
DST="$DST_DIR/claude-sessions-save.service"

GREEN='\033[0;32m'; YELLOW='\033[1;33m'; NC='\033[0m'
ok()   { echo -e "${GREEN}OK${NC}    $*"; }
skip() { echo -e "${YELLOW}SKIP${NC}  $*"; }

[[ -f "$SRC" ]] || { echo "ERROR: source not found: $SRC" >&2; exit 1; }

mkdir -p "$DST_DIR"

if [[ -f "$DST" ]] && diff -q "$SRC" "$DST" &>/dev/null; then
    skip "service file already up to date"
else
    cp "$SRC" "$DST"
    ok "installed $DST"
fi

systemctl --user daemon-reload
ok "daemon reloaded"

if systemctl --user is-enabled --quiet claude-sessions-save.service 2>/dev/null; then
    skip "already enabled"
else
    systemctl --user enable claude-sessions-save.service
    ok "enabled claude-sessions-save.service"
fi

if systemctl --user is-active --quiet claude-sessions-save.service 2>/dev/null; then
    skip "already active"
else
    systemctl --user start claude-sessions-save.service
    ok "started claude-sessions-save.service"
fi

echo ""
echo "claude-sessions-save.service is enabled and active."
echo "It will gracefully exit Claude tmux sessions at shutdown."