using Microsoft.AspNetCore.Mvc;
using MediatR;
using CellularManagement.Application.Features.Auth.Commands.AuthenticateUser;
using CellularManagement.Application.Features.Auth.Commands.RegisterUser;
using CellularManagement.Application.Features.Auth.Commands.RefreshToken;
using CellularManagement.Application.Common;
using Microsoft.Extensions.Logging;
using CellularManagement.Domain.Services;
using Microsoft.Extensions.Caching.Memory;
using CellularManagement.Infrastructure.Configurations;
using Microsoft.Extensions.Options;
using Microsoft.AspNetCore.Http;
using CellularManagement.Presentation.Abstractions;
using CellularManagement.Application.Features.Auth.Commands.Login;
using Swashbuckle.AspNetCore.Filters;
using CellularManagement.Domain.Common;

namespace CellularManagement.Presentation.Controllers;

/// <summary>
/// 认证控制器
/// 提供用户认证相关的 API 接口，包括登录和注册功能
/// </summary>
public class AuthController : ApiController
{
    private readonly ILogger<AuthController> _logger;
    private readonly ICacheService _cache;
    private readonly AuthConfiguration _authConfig;

    /// <summary>
    /// 初始化认证控制器
    /// </summary>
    /// <param name="mediator">MediatR 中介者，用于处理命令和查询</param>
    /// <param name="logger">日志记录器</param>
    /// <param name="cache">缓存服务</param>
    /// <param name="authConfig">认证配置</param>
    public AuthController(
        IMediator mediator,
        ILogger<AuthController> logger,
        ICacheService cache,
        IOptions<AuthConfiguration> authConfig) : base(mediator)
    {
        _logger = logger;
        _cache = cache;
        _authConfig = authConfig.Value;
    }

    /// <summary>
    /// 用户登录
    /// </summary>
    /// <remarks>
    /// 示例请求:
    ///
    ///     POST /api/auth/login
    ///     {
    ///        "userNameOrEmail": "用户名或邮箱",
    ///        "password": "密码"
    ///     }
    ///
    /// </remarks>
    /// <param name="command">登录命令，包含用户名/邮箱和密码</param>
    /// <returns>
    /// 登录结果，包含：
    /// - 成功：返回用户信息和访问令牌
    /// - 失败：返回错误信息
    /// </returns>
    /// <response code="200">登录成功，返回用户信息和令牌</response>
    /// <response code="400">登录失败，返回错误信息</response>
    /// <response code="429">登录尝试次数过多</response>
    [HttpPost()]
    [SwaggerRequestExample(typeof(LoginRequest), typeof(LoginRequestExample))]
    [ProducesResponseType(typeof(OperationResult<AuthenticateUserResponse>), StatusCodes.Status200OK)]
    [ProducesResponseType(typeof(OperationResult<AuthenticateUserResponse>), StatusCodes.Status400BadRequest)]
    [ProducesResponseType(typeof(OperationResult<AuthenticateUserResponse>), StatusCodes.Status429TooManyRequests)]
    public async Task<ActionResult<OperationResult<AuthenticateUserResponse>>> Login([FromBody] AuthenticateUserCommand command)
    {
        try
        {
            // 检查登录尝试次数
            var cacheKey = string.Format(_authConfig.LoginAttemptsCacheKeyFormat, command.UserName);
            var attempts = _cache.Get<int>(cacheKey);

            if (attempts >= _authConfig.MaxLoginAttempts)
            {
                _logger.LogWarning("用户 {UserName} 登录尝试次数过多", command.UserName);
                return StatusCode(StatusCodes.Status429TooManyRequests, 
                    OperationResult<AuthenticateUserResponse>.CreateFailure("登录尝试次数过多，请稍后再试"));
            }

            // 执行登录
            var result = await mediator.Send(command);

            if (!result.IsSuccess)
            {
                // 增加登录尝试次数
                var options = new MemoryCacheEntryOptions()
                    .SetAbsoluteExpiration(TimeSpan.FromMinutes(_authConfig.LoginAttemptsWindowMinutes));
                _cache.Set(cacheKey, attempts + 1, options);
                
                _logger.LogWarning("用户 {UserName} 登录失败: {Error}", 
                    command.UserName, 
                    result.ErrorMessages?.FirstOrDefault());
            }
            else
            {
                // 清除登录尝试次数
                _cache.Remove(cacheKey);
                _logger.LogInformation("用户 {UserName} 登录成功", command.UserName);
            }
            _logger.LogWarning($"Bearer {result.Data.AccessToken}");
            return Ok(result);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "用户 {UserName} 登录时发生异常", command.UserName);
            return StatusCode(StatusCodes.Status500InternalServerError,
                OperationResult<AuthenticateUserResponse>.CreateFailure("系统错误，请稍后重试"));
        }
    }

    /// <summary>
    /// 用户注册
    /// </summary>
    /// <remarks>
    /// 示例请求:
    ///
    ///     POST /api/auth/register
    ///     {
    ///        "userName": "用户名",
    ///        "email": "邮箱",
    ///        "password": "密码",
    ///        "confirmPassword": "确认密码",
    ///        "phoneNumber": "手机号"
    ///     }
    ///
    /// </remarks>
    /// <param name="command">注册命令，包含用户注册信息</param>
    /// <returns>
    /// 注册结果，包含：
    /// - 成功：返回用户ID
    /// - 失败：返回错误信息
    /// </returns>
    /// <response code="200">注册成功，返回用户ID</response>
    /// <response code="400">注册失败，返回错误信息</response>
    [HttpPost()]
    [ProducesResponseType(typeof(OperationResult<RegisterUserResponse>), StatusCodes.Status200OK)]
    [ProducesResponseType(typeof(OperationResult<RegisterUserResponse>), StatusCodes.Status400BadRequest)]
    public async Task<ActionResult<OperationResult<RegisterUserResponse>>> Register([FromBody] RegisterUserCommand command)
    {
        try
        {
            // 执行注册
            var result = await mediator.Send(command);

            if (result.IsSuccess)
            {
                _logger.LogInformation("用户 {UserName} 注册成功", command.UserName);
            }
            else
            {
                _logger.LogWarning("用户 {UserName} 注册失败: {Error}", 
                    command.UserName, 
                    result.ErrorMessages?.FirstOrDefault());
            }

            return Ok(result);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "用户 {UserName} 注册时发生异常", command.UserName);
            return StatusCode(StatusCodes.Status500InternalServerError,
                OperationResult<RegisterUserResponse>.CreateFailure("系统错误，请稍后重试"));
        }
    }

    /// <summary>
    /// 刷新令牌
    /// </summary>
    /// <remarks>
    /// 示例请求:
    ///
    ///     POST /api/auth/refresh-token
    ///     {
    ///        "refreshToken": "刷新令牌"
    ///     }
    ///
    /// </remarks>
    /// <param name="command">刷新令牌命令</param>
    /// <returns>
    /// 刷新结果，包含：
    /// - 成功：返回用户信息和新的访问令牌
    /// - 失败：返回错误信息
    /// </returns>
    /// <response code="200">刷新成功，返回用户信息和新的令牌</response>
    /// <response code="400">刷新失败，返回错误信息</response>
    [HttpPost()]
    [ProducesResponseType(typeof(OperationResult<AuthenticateUserResponse>), StatusCodes.Status200OK)]
    [ProducesResponseType(typeof(OperationResult<AuthenticateUserResponse>), StatusCodes.Status400BadRequest)]
    public async Task<ActionResult<OperationResult<AuthenticateUserResponse>>> RefreshToken([FromBody] RefreshTokenCommand command)
    {
        try
        {
            var result = await mediator.Send(command);

            if (result.IsSuccess)
            {
                _logger.LogInformation("令牌刷新成功");
            }
            else
            {
                _logger.LogWarning("令牌刷新失败: {Error}", 
                    result.ErrorMessages?.FirstOrDefault());
            }

            return Ok(result);
        }
        catch (Exception ex)
        {
            _logger.LogError(ex, "刷新令牌时发生异常");
            return StatusCode(StatusCodes.Status500InternalServerError,
                OperationResult<AuthenticateUserResponse>.CreateFailure("系统错误，请稍后重试"));
        }
    }
}