#!/usr/bin/env bash
#
# Deployment: Repository aktualisieren, Image bauen, Dienste neu starten.
# Aufruf:  ./scripts/deploy.sh [branch]
#
set -euo pipefail

REPO="${HOME}/repo"
BRANCH="${1:-main}"
LOG="${HOME}/deploy.log"

log() { printf '%(%F %T)T  %s\n' -1 "$*" | tee -a "$LOG"; }

log "=== Deployment gestartet (Branch: ${BRANCH}) ==="

# --- 1. Stand sichern, um zurückrollen zu koennen ---
cd "$REPO"
ALT_COMMIT="$(git rev-parse --short HEAD)"
log "Aktueller Stand: ${ALT_COMMIT}"

# --- 2. Repository aktualisieren ---
git fetch --all --prune
git checkout "$BRANCH"
git pull --ff-only
NEU_COMMIT="$(git rev-parse --short HEAD)"

if [[ "$ALT_COMMIT" == "$NEU_COMMIT" ]]; then
    log "Keine Aenderungen. Deployment beendet."
    exit 0
fi
log "Neuer Stand: ${NEU_COMMIT}"

# --- 3. Quadlet-Verknuepfungen auffrischen ---
mkdir -p "${HOME}/.config/containers/systemd"
find "${HOME}/.config/containers/systemd" -type l -delete
for f in "${REPO}"/quadlet/*.{container,volume,network,pod}; do
    [[ -e "$f" ]] && ln -sf "$f" "${HOME}/.config/containers/systemd/"
done

# --- 4. Image bauen ---
log "Baue Image ${NEU_COMMIT} ..."
podman build --pull \
    -t "localhost/webapp:${NEU_COMMIT}" \
    "${REPO}/images/webapp"
podman tag "localhost/webapp:${NEU_COMMIT}" localhost/webapp:aktuell

# --- 5. Dienste neu starten ---
systemctl --user daemon-reload
systemctl --user restart webapp.service

# --- 6. Zustand pruefen ---
log "Warte auf Gesundheitsstatus ..."
for i in {1..30}; do
    if podman healthcheck run webapp &>/dev/null; then
        log "Deployment erfolgreich: ${ALT_COMMIT} -> ${NEU_COMMIT}"
        podman image prune -f &>/dev/null || true
        exit 0
    fi
    sleep 2
done

# --- 7. Automatischer Rollback ---
log "FEHLER: Gesundheitspruefung fehlgeschlagen. Rollback auf ${ALT_COMMIT}."
podman tag "localhost/webapp:${ALT_COMMIT}" localhost/webapp:aktuell
git checkout "$ALT_COMMIT"
systemctl --user daemon-reload
systemctl --user restart webapp.service
log "Rollback abgeschlossen."
exit 1