using Microsoft.AspNetCore.Mvc;
using LingAdmin.Shared.DTOs;

namespace LingAdmin.ApiGateway.Controllers;

/// <summary>
/// 健康检查控制器
/// </summary>
[ApiController]
[Route("api/[controller]")]
public class HealthController : ControllerBase
{
    private readonly IConfiguration _configuration;
    private readonly IHttpClientFactory _httpClientFactory;
    private readonly ILogger<HealthController> _logger;

    public HealthController(
        IConfiguration configuration,
        IHttpClientFactory httpClientFactory,
        ILogger<HealthController> logger)
    {
        _configuration = configuration;
        _httpClientFactory = httpClientFactory;
        _logger = logger;
    }

    /// <summary>
    /// 网关健康检查
    /// </summary>
    [HttpGet]
    public ActionResult<object> GetHealth()
    {
        return Ok(new
        {
            Status = "Healthy",
            Service = "API Gateway",
            Timestamp = DateTime.UtcNow,
            Version = "1.0.0"
        });
    }

    /// <summary>
    /// 获取所有服务的健康状态
    /// </summary>
    [HttpGet("services")]
    public async Task<ActionResult<object>> GetServicesHealth()
    {
        var services = new Dictionary<string, object>();

        // Check Identity Service
        services["identity-service"] = await CheckServiceHealthAsync(
            _configuration["Services:IdentityService:BaseUrl"] ?? "http://localhost:5001");

        // Check Authorization Service
        services["authorization-service"] = await CheckServiceHealthAsync(
            _configuration["Services:AuthorizationService:BaseUrl"] ?? "http://localhost:5002");

        var allHealthy = services.Values.All(s => ((dynamic)s).Status == "Healthy");

        return Ok(new
        {
            Status = allHealthy ? "Healthy" : "Degraded",
            Timestamp = DateTime.UtcNow,
            Services = services
        });
    }

    private async Task<object> CheckServiceHealthAsync(string baseUrl)
    {
        try
        {
            var client = _httpClientFactory.CreateClient();
            client.Timeout = TimeSpan.FromSeconds(5);
            
            var response = await client.GetAsync($"{baseUrl}/api/health");
            
            return new
            {
                Status = response.IsSuccessStatusCode ? "Healthy" : "Unhealthy",
                StatusCode = (int)response.StatusCode
            };
        }
        catch (Exception ex)
        {
            _logger.LogWarning(ex, "Health check failed for {BaseUrl}", baseUrl);
            return new
            {
                Status = "Unhealthy",
                Error = ex.Message
            };
        }
    }
}