using Microsoft.AspNetCore.Mvc;
using System.Text.Json;

namespace HardwarePerformanceAPI.Controllers
{
    [ApiController]
    [Route("api/monitor")]
    public class MonitorController : ControllerBase
    {
        private readonly ILogger<MonitorController> _logger;
        private readonly string _logDirectory;

        public MonitorController(ILogger<MonitorController> logger)
        {
            _logger = logger;
            // 设置日志存储目录
            _logDirectory = Path.Combine(Directory.GetCurrentDirectory(), "logs", "monitor");
            
            // 确保目录存在
            if (!Directory.Exists(_logDirectory))
            {
                Directory.CreateDirectory(_logDirectory);
            }
        }

        [HttpPost("report")]
        public async Task<IActionResult> ReportData([FromBody] JsonElement data)
        {
            try
            {
                // 获取客户端IP
                var clientIp = HttpContext.Connection.RemoteIpAddress?.ToString() ?? "unknown";
                
                // 获取用户代理
                var userAgent = Request.Headers["User-Agent"].ToString() ?? "unknown";
                
                // 添加元数据
                var reportData = new
                {
                    Timestamp = DateTime.UtcNow,
                    ClientIp = clientIp,
                    UserAgent = userAgent,
                    Data = data
                };

                // 生成文件名（按日期分类）
                var fileName = $"monitor_{DateTime.UtcNow:yyyyMMdd}.json";
                var filePath = Path.Combine(_logDirectory, fileName);

                // 将数据写入文件
                var json = JsonSerializer.Serialize(reportData, new JsonSerializerOptions 
                { 
                    WriteIndented = true 
                });
                
                await System.IO.File.AppendAllTextAsync(filePath, json + Environment.NewLine + Environment.NewLine);

                _logger.LogInformation("Monitor data received from {ClientIp}", clientIp);
                
                return Ok(new { success = true, message = "Data reported successfully" });
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Error processing monitor data");
                return StatusCode(500, new { success = false, message = "Internal server error" });
            }
        }

        [HttpGet("stats")]
        public IActionResult GetStats()
        {
            try
            {
                var stats = new
                {
                    ReportsCount = CountReports(),
                    LastReportTime = GetLastReportTime(),
                    ErrorCount = CountReportsByType("error"),
                    PerformanceCount = CountReportsByType("performance")
                };

                return Ok(stats);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "Error getting monitor stats");
                return StatusCode(500, new { success = false, message = "Internal server error" });
            }
        }

        private int CountReports()
        {
            var today = DateTime.UtcNow.ToString("yyyyMMdd");
            var filePath = Path.Combine(_logDirectory, $"monitor_{today}.json");
            
            if (!System.IO.File.Exists(filePath))
                return 0;

            var content = System.IO.File.ReadAllText(filePath);
            var lines = content.Split(new[] { Environment.NewLine + Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
            return lines.Length;
        }

        private DateTime? GetLastReportTime()
        {
            var today = DateTime.UtcNow.ToString("yyyyMMdd");
            var filePath = Path.Combine(_logDirectory, $"monitor_{today}.json");
            
            if (!System.IO.File.Exists(filePath))
                return null;

            var fileInfo = new FileInfo(filePath);
            return fileInfo.LastWriteTimeUtc;
        }

        private int CountReportsByType(string type)
        {
            var today = DateTime.UtcNow.ToString("yyyyMMdd");
            var filePath = Path.Combine(_logDirectory, $"monitor_{today}.json");
            
            if (!System.IO.File.Exists(filePath))
                return 0;

            var content = System.IO.File.ReadAllText(filePath);
            var lines = content.Split(new[] { Environment.NewLine + Environment.NewLine }, StringSplitOptions.RemoveEmptyEntries);
            
            int count = 0;
            foreach (var line in lines)
            {
                try
                {
                    using var document = JsonDocument.Parse(line);
                    if (document.RootElement.TryGetProperty("Data", out var dataElement))
                    {
                        if (dataElement.TryGetProperty("type", out var typeElement) && 
                            typeElement.GetString()?.Contains(type) == true)
                        {
                            count++;
                        }
                    }
                }
                catch
                {
                    // 忽略解析错误
                }
            }
            
            return count;
        }
    }
}