#!/bin/bash
source "${AGENT_PATH}/common.sh"
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

# Check required environment variables
_check_required_env_vars "CONTAINER_NAME" "ES_VERSION" "LS_VERSION" "KIBANA_VERSION"

# Check Docker and Docker Compose are available
_check_docker_installed || _die "Docker test failed"
docker compose version >/dev/null 2>&1 || _die "Docker Compose is not installed (requires Docker Compose V2)"

# Check vm.max_map_count for Elasticsearch
current_max_map_count=$(sysctl -n vm.max_map_count 2>/dev/null || echo 0)
if [ "$current_max_map_count" -lt 262144 ]; then
    echo "WARNING: vm.max_map_count is too low ($current_max_map_count)"
    echo "Elasticsearch requires at least 262144"
    echo "Please run: sudo sysctl -w vm.max_map_count=262144"
    echo "And add to /etc/sysctl.conf to persist"
    _die "System configuration needs adjustment"
fi

# Stop any existing containers
bash ./stop.sh || true

# Remove old containers
docker compose down --remove-orphans 2>/dev/null || true

# Pull the Docker images
echo "Pulling ELK stack images..."
docker pull docker.elastic.co/elasticsearch/elasticsearch:${ES_VERSION} || _die "Failed to pull Elasticsearch"
docker pull docker.elastic.co/logstash/logstash:${LS_VERSION} || _die "Failed to pull Logstash"
docker pull docker.elastic.co/kibana/kibana:${KIBANA_VERSION} || _die "Failed to pull Kibana"

# Ensure config directory exists
mkdir -p "${CONFIG_PATH}"

# Initialize API keys file if it doesn't exist
if [ ! -f "${CONFIG_PATH}/api-keys.yml" ]; then
    echo "No API keys configured yet."
    echo "Run ./generate-api-key.sh to add client keys"
    echo "api_keys:" > "${CONFIG_PATH}/api-keys.yml"
fi

# Copy Logstash configuration if it doesn't exist
if [ ! -f "${CONFIG_PATH}/logstash.conf" ]; then
    SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
    if [ -f "$SCRIPT_DIR/config/logstash.conf" ]; then
        cp "$SCRIPT_DIR/config/logstash.conf" "${CONFIG_PATH}/logstash.conf"
        echo "Copied Logstash configuration to ${CONFIG_PATH}"
    else
        echo "WARNING: logstash.conf not found in template"
    fi
fi

# Start the ELK stack
echo "Starting ELK stack..."
docker compose up -d --build || _die "Failed to start ELK stack"

# Wait for services to be ready
echo "Waiting for services to start..."
sleep 10

# Check status
bash ./status.sh || _die "Services failed to start properly"

echo "Installation of ${CONTAINER_NAME} complete"
echo ""
echo "========================================="
echo "Kibana UI: ${SERVER_PUBLICBASEURL:-http://$(hostname -I | awk '{print $1}'):${KIBANA_PORT}}"
echo "Username: elastic"
echo "Password: ${ELASTIC_PASSWORD:-changeme}"
echo "========================================="
echo ""
echo "IMPORTANT: Update service.env with:"
echo "  - Your actual server IP/domain in SERVER_PUBLICBASEURL"
echo "  - A secure password in ELASTIC_PASSWORD"
echo ""
echo "Logstash listening on port ${LOGSTASH_BEATS_PORT} for Filebeat clients"
echo ""
echo "To add client authentication:"
echo "  ./generate-api-key.sh"