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

# Gitea / Git deployment runner script for Proxmox LXC container with Docker.
#
# Usage:
#   ./gitea-deploy.sh
#
# Optional environment variables:
#   REPO_DIR         Path to the repository root (default: script directory)
#   DEPLOY_BRANCH    Git branch to deploy (default: main)
#   COMPOSE_FILE     Docker Compose file path (default: docker-compose.yml)
#   DOCKER_CMD       Docker command to use (auto-detected)
#   GIT_CLEAN        If set to 1, clean untracked files before deploy

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_DIR="${REPO_DIR:-$SCRIPT_DIR}"
DEPLOY_BRANCH="${DEPLOY_BRANCH:-main}"
COMPOSE_FILE="${COMPOSE_FILE:-docker-compose.yml}"
GIT_CLEAN="${GIT_CLEAN:-0}"

if command -v docker >/dev/null 2>&1 && docker compose version >/dev/null 2>&1; then
  DOCKER_COMPOSE_CMD="docker compose"
elif command -v docker-compose >/dev/null 2>&1; then
  DOCKER_COMPOSE_CMD="docker-compose"
else
  echo "ERROR: docker compose command not found. Install Docker Compose or use Docker v20+ with built-in compose."
  exit 1
fi

cd "$REPO_DIR"

echo "Deploying $REPO_DIR"
echo "Branch: $DEPLOY_BRANCH"
echo "Compose file: $COMPOSE_FILE"

if ! command -v git >/dev/null 2>&1; then
  echo "ERROR: git is not installed."
  exit 1
fi

if [ ! -f "$COMPOSE_FILE" ]; then
  echo "ERROR: Compose file '$COMPOSE_FILE' not found in $REPO_DIR."
  exit 1
fi

# Ensure repository is on the correct branch and in sync with remote.

git fetch --all --prune

git checkout "$DEPLOY_BRANCH"
git reset --hard "origin/$DEPLOY_BRANCH"

if [ "$GIT_CLEAN" = "1" ]; then
  echo "Cleaning untracked files..."
  git clean -fdx
fi

# Build and deploy with Docker Compose.

echo "Stopping existing containers and removing orphans..."
$DOCKER_COMPOSE_CMD -f "$COMPOSE_FILE" down --remove-orphans

echo "Building image..."
$DOCKER_COMPOSE_CMD -f "$COMPOSE_FILE" build --no-cache

echo "Starting containers..."
$DOCKER_COMPOSE_CMD -f "$COMPOSE_FILE" up -d

echo "Deployment finished. Current service status:"
$DOCKER_COMPOSE_CMD -f "$COMPOSE_FILE" ps

exit 0