using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Cors;
using Microsoft.AspNetCore.Mvc;
using DotNext;

namespace server.Controllers;

/// <summary>
/// 实验控制器
/// </summary>
[ApiController]
[Route("api/[controller]")]
public class ExamController : ControllerBase
{
    private static NLog.Logger logger = NLog.LogManager.GetCurrentClassLogger();

    /// <summary>
    /// 实验信息类
    /// </summary>
    public class ExamInfo
    {
        /// <summary>
        /// 实验的唯一标识符
        /// </summary>
        public required string ID { get; set; }

        /// <summary>
        /// 实验名称
        /// </summary>
        public required string Name { get; set; }

        /// <summary>
        /// 实验描述
        /// </summary>
        public required string Description { get; set; }

        /// <summary>
        /// 实验创建时间
        /// </summary>
        public DateTime CreatedTime { get; set; }

        /// <summary>
        /// 实验最后更新时间
        /// </summary>
        public DateTime UpdatedTime { get; set; }

        /// <summary>
        /// 实验标签
        /// </summary>
        public string[] Tags { get; set; } = Array.Empty<string>();

        /// <summary>
        /// 实验难度（1-5）
        /// </summary>
        public int Difficulty { get; set; } = 1;

        /// <summary>
        /// 普通用户是否可见
        /// </summary>
        public bool IsVisibleToUsers { get; set; } = true;
    }

    /// <summary>
    /// 实验简要信息类（用于列表显示）
    /// </summary>
    public class ExamSummary
    {
        /// <summary>
        /// 实验的唯一标识符
        /// </summary>
        public required string ID { get; set; }

        /// <summary>
        /// 实验名称
        /// </summary>
        public required string Name { get; set; }

        /// <summary>
        /// 实验创建时间
        /// </summary>
        public DateTime CreatedTime { get; set; }

        /// <summary>
        /// 实验最后更新时间
        /// </summary>
        public DateTime UpdatedTime { get; set; }

        /// <summary>
        /// 实验标签
        /// </summary>
        public string[] Tags { get; set; } = Array.Empty<string>();

        /// <summary>
        /// 实验难度（1-5）
        /// </summary>
        public int Difficulty { get; set; } = 1;

        /// <summary>
        /// 普通用户是否可见
        /// </summary>
        public bool IsVisibleToUsers { get; set; } = true;
    }

    /// <summary>
    /// 创建实验请求类
    /// </summary>
    public class CreateExamRequest
    {
        /// <summary>
        /// 实验ID
        /// </summary>
        public required string ID { get; set; }

        /// <summary>
        /// 实验名称
        /// </summary>
        public required string Name { get; set; }

        /// <summary>
        /// 实验描述
        /// </summary>
        public required string Description { get; set; }

        /// <summary>
        /// 实验标签
        /// </summary>
        public string[] Tags { get; set; } = Array.Empty<string>();

        /// <summary>
        /// 实验难度（1-5）
        /// </summary>
        public int Difficulty { get; set; } = 1;

        /// <summary>
        /// 普通用户是否可见
        /// </summary>
        public bool IsVisibleToUsers { get; set; } = true;
    }

    /// <summary>
    /// 获取所有实验列表
    /// </summary>
    /// <returns>实验列表</returns>
    [Authorize]
    [HttpGet("list")]
    [EnableCors("Users")]
    [ProducesResponseType(typeof(ExamSummary[]), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
    public IActionResult GetExamList()
    {
        try
        {
            using var db = new Database.AppDataConnection();
            var exams = db.GetAllExams();

            var examSummaries = exams.Select(exam => new ExamSummary
            {
                ID = exam.ID,
                Name = exam.Name,
                CreatedTime = exam.CreatedTime,
                UpdatedTime = exam.UpdatedTime,
                Tags = exam.GetTagsList(),
                Difficulty = exam.Difficulty,
                IsVisibleToUsers = exam.IsVisibleToUsers
            }).ToArray();

            logger.Info($"成功获取实验列表，共 {examSummaries.Length} 个实验");
            return Ok(examSummaries);
        }
        catch (Exception ex)
        {
            logger.Error($"获取实验列表时出错: {ex.Message}");
            return StatusCode(StatusCodes.Status500InternalServerError, $"获取实验列表失败: {ex.Message}");
        }
    }

    /// <summary>
    /// 根据实验ID获取实验详细信息
    /// </summary>
    /// <param name="examId">实验ID</param>
    /// <returns>实验详细信息</returns>
    [Authorize]
    [HttpGet("{examId}")]
    [EnableCors("Users")]
    [ProducesResponseType(typeof(ExamInfo), StatusCodes.Status200OK)]
    [ProducesResponseType(StatusCodes.Status400BadRequest)]
    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
    [ProducesResponseType(StatusCodes.Status404NotFound)]
    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
    public IActionResult GetExam(string examId)
    {
        if (string.IsNullOrWhiteSpace(examId))
            return BadRequest("实验ID不能为空");

        try
        {
            using var db = new Database.AppDataConnection();
            var result = db.GetExamByID(examId);

            if (!result.IsSuccessful)
            {
                logger.Error($"获取实验时出错: {result.Error.Message}");
                return StatusCode(StatusCodes.Status500InternalServerError, $"获取实验失败: {result.Error.Message}");
            }

            if (!result.Value.HasValue)
            {
                logger.Warn($"实验不存在: {examId}");
                return NotFound($"实验 {examId} 不存在");
            }

            var exam = result.Value.Value;
            var examInfo = new ExamInfo
            {
                ID = exam.ID,
                Name = exam.Name,
                Description = exam.Description,
                CreatedTime = exam.CreatedTime,
                UpdatedTime = exam.UpdatedTime,
                Tags = exam.GetTagsList(),
                Difficulty = exam.Difficulty,
                IsVisibleToUsers = exam.IsVisibleToUsers
            };

            logger.Info($"成功获取实验信息: {examId}");
            return Ok(examInfo);
        }
        catch (Exception ex)
        {
            logger.Error($"获取实验 {examId} 时出错: {ex.Message}");
            return StatusCode(StatusCodes.Status500InternalServerError, $"获取实验失败: {ex.Message}");
        }
    }

    /// <summary>
    /// 创建新实验
    /// </summary>
    /// <param name="request">创建实验请求</param>
    /// <returns>创建结果</returns>
    [Authorize("Admin")]
    [HttpPost]
    [EnableCors("Users")]
    [ProducesResponseType(typeof(ExamInfo), StatusCodes.Status201Created)]
    [ProducesResponseType(StatusCodes.Status400BadRequest)]
    [ProducesResponseType(StatusCodes.Status401Unauthorized)]
    [ProducesResponseType(StatusCodes.Status403Forbidden)]
    [ProducesResponseType(StatusCodes.Status409Conflict)]
    [ProducesResponseType(StatusCodes.Status500InternalServerError)]
    public IActionResult CreateExam([FromBody] CreateExamRequest request)
    {
        if (string.IsNullOrWhiteSpace(request.ID) || string.IsNullOrWhiteSpace(request.Name) || string.IsNullOrWhiteSpace(request.Description))
            return BadRequest("实验ID、名称和描述不能为空");

        try
        {
            using var db = new Database.AppDataConnection();
            var result = db.CreateExam(request.ID, request.Name, request.Description, request.Tags, request.Difficulty, request.IsVisibleToUsers);

            if (!result.IsSuccessful)
            {
                if (result.Error.Message.Contains("已存在"))
                    return Conflict(result.Error.Message);
                
                logger.Error($"创建实验时出错: {result.Error.Message}");
                return StatusCode(StatusCodes.Status500InternalServerError, $"创建实验失败: {result.Error.Message}");
            }

            var exam = result.Value;
            var examInfo = new ExamInfo
            {
                ID = exam.ID,
                Name = exam.Name,
                Description = exam.Description,
                CreatedTime = exam.CreatedTime,
                UpdatedTime = exam.UpdatedTime,
                Tags = exam.GetTagsList(),
                Difficulty = exam.Difficulty,
                IsVisibleToUsers = exam.IsVisibleToUsers
            };

            logger.Info($"成功创建实验: {request.ID}");
            return CreatedAtAction(nameof(GetExam), new { examId = request.ID }, examInfo);
        }
        catch (Exception ex)
        {
            logger.Error($"创建实验 {request.ID} 时出错: {ex.Message}");
            return StatusCode(StatusCodes.Status500InternalServerError, $"创建实验失败: {ex.Message}");
        }
    }
}