#!/usr/bin/env bash
# EMS single-server deploy: aktualizace git checkoutu, sync compose, docker compose build + up.
#
# Jednorázový bootstrap na serveru (po prvním merge tohoto skriptu do main):
#   sudo mkdir -p /opt/ems-deploy/app
#   sudo chown -R "$USER:$USER" /opt/ems-deploy
#   git clone ssh://git@git.vojacek.eu:2222/vojacekd/ems.git /opt/ems-deploy/app
#   cp /opt/ems-deploy/app/.env.example /opt/ems-deploy/.env
#   # upravit /opt/ems-deploy/.env (chmod 600)
#   install -m 755 /opt/ems-deploy/app/deploy/deploy.sh /opt/ems-deploy/deploy.sh
#   /opt/ems-deploy/deploy.sh

set -euo pipefail

ROOT="${EMS_DEPLOY_ROOT:-/opt/ems-deploy}"
APP="${ROOT}/app"
COMPOSE_SRC="${APP}/deploy/docker-compose.yml"
COMPOSE_DST="${ROOT}/docker-compose.yml"
ENV_FILE="${ROOT}/.env"
LOCK_FILE="${ROOT}/.deploy.lock"

log() {
  echo "[$(date -Iseconds)] $*"
}

if [[ ! -d "$APP/.git" ]]; then
  log "ERROR: missing git checkout at $APP (see bootstrap header in this script)."
  exit 1
fi

if [[ ! -f "$ENV_FILE" ]]; then
  log "ERROR: missing $ENV_FILE"
  exit 1
fi

if [[ ! -f "$COMPOSE_SRC" ]]; then
  log "ERROR: missing $COMPOSE_SRC (is deploy/docker-compose.yml in the repo?)"
  exit 1
fi

exec 9>"$LOCK_FILE"
flock 9
log "Starting deploy (ROOT=$ROOT)"

log "Git: fetch origin"
git -C "$APP" fetch origin

log "Git: checkout main && reset --hard origin/main"
git -C "$APP" checkout main
git -C "$APP" reset --hard "origin/main"

log "Sync compose -> $COMPOSE_DST"
install -m 0644 "$COMPOSE_SRC" "$COMPOSE_DST"

export COMPOSE_FILE="$COMPOSE_DST"

log "docker compose config (validate)"
docker compose -f "$COMPOSE_DST" --env-file "$ENV_FILE" config >/dev/null

log "docker compose build"
docker compose -f "$COMPOSE_DST" --env-file "$ENV_FILE" build

log "docker compose up -d"
docker compose -f "$COMPOSE_DST" --env-file "$ENV_FILE" up -d

log "docker image prune (dangling only)"
docker image prune -f

log "Deploy finished OK"