#!/bin/bash
#
# Minecraft Server Health Check Script
# Deployed by Ansible - managed file
#
# Checks that the Minecraft server is running and responding.
#

set -euo pipefail

SERVER_NAME="{{ minecraft.server_name }}"
PORT="{{ minecraft.port }}"
CONTAINER_NAME="{{ podman_container_name }}"

# Colors
GREEN='\033[0;32m'
RED='\033[0;31m'
YELLOW='\033[1;33m'
NC='\033[0m'

log() {
    echo -e "$(date '+%Y-%m-%d %H:%M:%S') $*"
}

# Check 1: Is the systemd service active?
SERVICE_STATUS=$(systemctl is-active "${SERVER_NAME}" 2>/dev/null || echo "inactive")
if [ "$SERVICE_STATUS" != "active" ]; then
    log "${RED}[FAIL]${NC} Systemd service ${SERVER_NAME} is not active (status: ${SERVICE_STATUS})"
    exit 1
fi
log "${GREEN}[OK]${NC} Systemd service ${SERVER_NAME} is active"

# Check 2: Is the container running?
if ! podman ps --format '{% raw %}{{.Names}} {{.Status}}{% endraw %}' | grep -q "${CONTAINER_NAME}"; then
    log "${RED}[FAIL]${NC} Container ${CONTAINER_NAME} is not running"
    exit 1
fi
log "${GREEN}[OK]${NC} Container ${CONTAINER_NAME} is running"

# Check 3: Is the Minecraft port responding?
# Minecraft responds to HTTP with 401 "It's a teapot" or similar
if curl -s -o /dev/null -m 5 http://localhost:${PORT} 2>/dev/null; then
    log "${GREEN}[OK]${NC} Port ${PORT} is responding"
elif curl -s -o /dev/null -m 5 -w "%{http_code}" http://localhost:${PORT} 2>/dev/null | grep -q "401"; then
    log "${GREEN}[OK]${NC} Port ${PORT} is responding (401 is expected for Minecraft)"
else
    # Check if port is at least listening
    if ss -tln | grep -q ":${PORT}"; then
        log "${YELLOW}[WARN]${NC} Port ${PORT} is listening but not responding to HTTP (may be normal)"
    else
        log "${RED}[FAIL]${NC} Port ${PORT} is not listening"
        exit 1
    fi
fi

# Check 4: Check recent logs for errors
LOG_TAIL=$(journalctl -u "${SERVER_NAME}" --no-pager -n 50 2>/dev/null | grep -i "error\|fatal\|crash" | tail -n 5)
if [ -n "$LOG_TAIL" ]; then
    log "${YELLOW}[WARN]${NC} Recent errors found in logs:"
    echo "$LOG_TAIL"
else
    log "${GREEN}[OK]${NC} No recent errors in logs"
fi

log "${GREEN}Health check completed successfully${NC}"
exit 0