#!/usr/bin/env bash
# auto-update.sh — pull latest changes and restart affected services.
# Run by the hiy-update.timer systemd user unit every 5 minutes.
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"

log() { echo "[hiy-update] $(date '+%H:%M:%S') $*"; }

cd "$REPO_ROOT"

# Fetch without touching the working tree.
git fetch origin 2>&1 | sed 's/^/[git] /' || { log "git fetch failed — skipping"; exit 0; }

LOCAL=$(git rev-parse HEAD)
REMOTE=$(git rev-parse "@{u}" 2>/dev/null || echo "$LOCAL")

if [ "$LOCAL" = "$REMOTE" ]; then
    log "Already up to date ($LOCAL)."
    exit 0
fi

log "New commits detected — pulling ($LOCAL → $REMOTE)…"
git pull 2>&1 | sed 's/^/[git] /'

# Determine which services need restarting based on what changed.
CHANGED=$(git diff --name-only "$LOCAL" "$REMOTE")
log "Changed files: $(echo "$CHANGED" | tr '\n' ' ')"

# Always rebuild the server if any server-side code changed.
SERVER_CHANGED=$(echo "$CHANGED" | grep -E '^server/|^Cargo' || true)
COMPOSE_CHANGED=$(echo "$CHANGED" | grep '^infra/docker-compose' || true)
CADDY_CHANGED=$(echo "$CHANGED"  | grep '^proxy/Caddyfile' || true)

COMPOSE_CMD="podman compose --env-file $REPO_ROOT/.env -f $SCRIPT_DIR/docker-compose.yml"

if [ -n "$COMPOSE_CHANGED" ]; then
    log "docker-compose.yml changed — restarting full stack…"
    $COMPOSE_CMD up -d
elif [ -n "$SERVER_CHANGED" ]; then
    log "Server code changed — rebuilding server…"
    $COMPOSE_CMD up -d --build server
elif [ -n "$CADDY_CHANGED" ]; then
    log "Caddyfile changed — reloading Caddy…"
    $COMPOSE_CMD exec caddy caddy reload --config /etc/caddy/Caddyfile --adapter caddyfile
else
    log "No service restart needed for these changes."
fi

log "Done."