#!/usr/bin/env bash
# Voice-Agent Mac-Worker — vollständiger Installer.
#
# Macht alles, was nötig ist, damit der Worker dauerhaft läuft:
#   - Python-venv anlegen + Dependencies installieren (idempotent)
#   - .env aus Vorlage anlegen (falls fehlt)
#   - LaunchAgent registrieren / aktualisieren / starten
#   - Health-Check
#
# Kann beliebig oft erneut laufen (z. B. nach git pull).
#
# Befehle:
#   ./install-launchagent.sh            # installieren / aktualisieren
#   ./install-launchagent.sh uninstall  # entfernen
#   ./install-launchagent.sh status     # Status + letzte Logs
#   ./install-launchagent.sh restart    # Worker neu starten (kein Reinstall)
set -euo pipefail

LABEL="com.voiceagent.worker"
PLIST_DST="$HOME/Library/LaunchAgents/${LABEL}.plist"
LOG_DIR="$HOME/Library/Logs"
DOMAIN="gui/$(id -u)"
SERVICE_TARGET="${DOMAIN}/${LABEL}"

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
WORKDIR="$(cd "$SCRIPT_DIR/.." && pwd)"
TEMPLATE="$SCRIPT_DIR/com.voiceagent.worker.plist.template"

cmd="${1:-install}"

# Bevorzugter Python-Interpreter (venv-Anlage). Reihenfolge: 3.11, 3.12, 3
pick_python() {
    for p in python3.11 python3.12 python3; do
        if command -v "$p" >/dev/null 2>&1; then
            echo "$p"
            return 0
        fi
    done
    echo ""; return 1
}

ensure_venv() {
    local py
    py="$(pick_python)"
    if [ -z "$py" ]; then
        echo "FEHLER: kein python3 gefunden. Bitte 'brew install python@3.11' ausführen." >&2
        exit 1
    fi
    if [ ! -x "$WORKDIR/.venv/bin/python" ]; then
        echo "[venv] Erzeuge $WORKDIR/.venv mit $py"
        "$py" -m venv "$WORKDIR/.venv"
    fi
    echo "[venv] Pip aktualisieren + Dependencies installieren"
    "$WORKDIR/.venv/bin/pip" install --upgrade pip >/dev/null
    "$WORKDIR/.venv/bin/pip" install -r "$WORKDIR/requirements.txt"
}

ensure_env() {
    if [ ! -f "$WORKDIR/.env" ]; then
        echo "[env] Lege $WORKDIR/.env aus .env.example an (bitte ggf. anpassen)."
        cp "$WORKDIR/.env.example" "$WORKDIR/.env"
    fi
}

write_plist() {
    mkdir -p "$LOG_DIR" "$HOME/Library/LaunchAgents"
    sed \
        -e "s|__WORKDIR__|$WORKDIR|g" \
        -e "s|__HOME__|$HOME|g" \
        "$TEMPLATE" > "$PLIST_DST"
}

# Modernes launchctl: bootout/bootstrap statt unload/load
# (auf neueren macOS-Versionen wirft "launchctl unload -w" Input/output error 5).
service_unload() {
    launchctl bootout "$SERVICE_TARGET" 2>/dev/null || true
}

service_load() {
    launchctl bootstrap "$DOMAIN" "$PLIST_DST"
}

service_kickstart() {
    # -k = Prozess hart killen + neu starten (greift auch wenn schon läuft).
    launchctl kickstart -k "$SERVICE_TARGET"
}

uninstall() {
    if [ -f "$PLIST_DST" ]; then
        echo "[*] Stoppe und entlade LaunchAgent…"
        service_unload
        rm -f "$PLIST_DST"
        echo "[OK] $PLIST_DST entfernt."
    else
        echo "[i] Kein LaunchAgent installiert ($PLIST_DST nicht vorhanden)."
    fi
}

show_status() {
    echo "── launchctl print $SERVICE_TARGET ─────────────────────"
    launchctl print "$SERVICE_TARGET" 2>/dev/null | head -20 || echo "(nicht geladen)"
    echo
    echo "── Health-Check ─────────────────────────────────────────"
    if curl -fsS http://127.0.0.1:8080/health 2>/dev/null; then
        echo
    else
        echo "(nicht erreichbar)"
    fi
    echo
    echo "── stderr.log (letzte 30 Zeilen) ────────────────────────"
    tail -n 30 "$LOG_DIR/voice-agent-worker.err.log" 2>/dev/null || echo "(keine Logs)"
}

restart_only() {
    if [ ! -f "$PLIST_DST" ]; then
        echo "[!] Kein LaunchAgent installiert — bitte zuerst './install-launchagent.sh' ausführen." >&2
        exit 1
    fi
    echo "[*] kickstart -k $SERVICE_TARGET"
    service_kickstart
    sleep 2
    if curl -fsS http://127.0.0.1:8080/health >/dev/null 2>&1; then
        echo "[OK] Worker läuft wieder."
    else
        echo "[!] Health-Check schlägt nach Restart fehl — siehe $LOG_DIR/voice-agent-worker.err.log" >&2
        tail -n 20 "$LOG_DIR/voice-agent-worker.err.log" 2>/dev/null || true
        exit 1
    fi
}

install_agent() {
    echo "[1/6] venv + Dependencies"
    ensure_venv

    echo "[2/6] .env"
    ensure_env

    echo "[3/6] plist generieren ($PLIST_DST)"
    write_plist

    echo "[4/6] LaunchAgent (bootout falls vorhanden, dann bootstrap)"
    service_unload
    service_load

    echo "[5/6] Health-Check (max. 8 s warten)"
    local ok=0
    for _ in 1 2 3 4 5 6 7 8; do
        sleep 1
        if curl -fsS http://127.0.0.1:8080/health >/dev/null 2>&1; then
            ok=1
            break
        fi
    done
    if [ "$ok" -ne 1 ]; then
        echo
        echo "[!] Health-Check fehlgeschlagen. Letzte Log-Zeilen:" >&2
        tail -n 30 "$LOG_DIR/voice-agent-worker.err.log" 2>/dev/null || true
        echo
        echo "    Plist: $PLIST_DST"
        echo "    Logs:  $LOG_DIR/voice-agent-worker.{out,err}.log"
        exit 1
    fi

    echo "[6/6] Health-Antwort:"
    curl -s http://127.0.0.1:8080/health | python3 -m json.tool 2>/dev/null || true

    cat <<EOF

[OK] Voice-Agent Mac-Worker läuft.

── Verwaltung ────────────────────────────────────────────────────
  Status + Logs:   $0 status
  Restart:         $0 restart           # nur Prozess neu starten
  Update:          $WORKDIR/deploy/update.sh   # git pull + restart
  Entfernen:       $0 uninstall
  Live-Logs:       tail -f $LOG_DIR/voice-agent-worker.{out,err}.log
EOF
}

case "$cmd" in
    install)   install_agent ;;
    uninstall) uninstall ;;
    status)    show_status ;;
    restart)   restart_only ;;
    *)
        echo "Nutzung: $0 [install|uninstall|status|restart]" >&2
        exit 1
        ;;
esac