#!/usr/bin/env bash
set -Eeuo pipefail

APP_NAME="corp-address-book"
CONTAINER_NAME="corporate-address-book"
INSTALL_DIR="/opt/corp-address-book"
IMAGE_NAME="corp-address-book:latest"
HOST_PORT="8180"
CONTAINER_PORT="3000"

log() {
  printf '\n[%s] %s\n' "$(date +'%H:%M:%S')" "$*"
}

die() {
  printf '\nERROR: %s\n' "$*" >&2
  exit 1
}

# 1. Require root
if [ "${EUID:-$(id -u)}" -ne 0 ]; then
  die "Run this update script as root, for example: curl -fsSL ... | sudo bash"
fi

# 2. Go to installation directory
log "Navigating to ${INSTALL_DIR}"
cd "$INSTALL_DIR" || die "Directory ${INSTALL_DIR} does not exist. Run install.sh first."

# 2.1. Backup existing database
if [ -f "${INSTALL_DIR}/data/database.db" ]; then
  log "Backing up existing database"
  cp "${INSTALL_DIR}/data/database.db" "${INSTALL_DIR}/data/database.db.bak"
  log "Database backup created at ${INSTALL_DIR}/data/database.db.bak"
fi

# 3. Configure git safe directory
log "Configuring git safe directory"
git config --global --add safe.directory "$INSTALL_DIR" || true

# 4. Configure git remote and pull latest changes
log "Configuring git remote to HTTPS"
git remote set-url origin https://git.h0melab.ru/fabritsky/corp-address-book.git

log "Pulling latest changes from Gitea via HTTPS"
git pull --ff-only origin main

# 5. Build Docker Image (Re-compile frontend and backend inside container)
log "Building updated Docker image ${IMAGE_NAME}"
docker build -t "$IMAGE_NAME" "$INSTALL_DIR"

# 6. Safely replace container
log "Replacing container ${CONTAINER_NAME}"
old_name=""
if docker container inspect "$CONTAINER_NAME" >/dev/null 2>&1; then
  old_name="${CONTAINER_NAME}-old-$(date +%Y%m%d-%H%M%S)"
  docker stop "$CONTAINER_NAME" >/dev/null
  docker rename "$CONTAINER_NAME" "$old_name"
  log "Previous container renamed to ${old_name}"
fi

log "Starting new container on port ${HOST_PORT}"
if ! docker run -d \
  --name "$CONTAINER_NAME" \
  --restart unless-stopped \
  --env-file "${INSTALL_DIR}/.env" \
  -p "${HOST_PORT}:${CONTAINER_PORT}" \
  -v "${INSTALL_DIR}/data:/app/data" \
  "$IMAGE_NAME" >/dev/null; then
  if [ -n "$old_name" ]; then
    log "New container failed to start; rolling back to ${old_name}"
    docker rename "$old_name" "$CONTAINER_NAME" || true
    docker start "$CONTAINER_NAME" || true
  fi
  die "Failed to start new container."
fi

# 7. Health Check / Status
log "Running health check..."
sleep 5
if curl -fsSI "http://127.0.0.1:${HOST_PORT}/" >/dev/null; then
  log "Update completed successfully!"
  log "Service HTTP Status: $(curl -o /dev/null -s -w "%{http_code}" http://127.0.0.1:${HOST_PORT}/)"
  log "Container Status:"
  docker ps --filter "name=${CONTAINER_NAME}"
  
  # Remove the backup old container since deployment succeeded
  if [ -n "$old_name" ]; then
    log "Cleaning up old backup container ${old_name}"
    docker rm "$old_name" >/dev/null || true
  fi
else
  docker logs --tail=80 "$CONTAINER_NAME" || true
  if [ -n "$old_name" ]; then
    log "Health check failed; rolling back to ${old_name}"
    docker stop "$CONTAINER_NAME" >/dev/null || true
    docker rm "$CONTAINER_NAME" || true
    docker rename "$old_name" "$CONTAINER_NAME" || true
    docker start "$CONTAINER_NAME" || true
  fi
  die "Health check failed. Rolled back to the previous container version."
fi