using System;
using System.Collections.Generic;
using UnityEngine;
using System.IO;
using System.Text;

/// <summary>
/// 患者会话服务
/// 管理从登录管理员账号 -> 输入患者信息 -> 启动测量 -> 显示患者数据的完整流程
/// </summary>
public class PatientSessionService : IService
{
    public event Action<PatientSession> OnSessionStarted;
    public event Action<PatientSession> OnSessionEnded;
    public event Action<PatientMeasurementData> OnMeasurementAdded;
    public event Action<PatientSession> OnSessionDataUpdated;
    
    private PatientSession _currentSession;
    private List<PatientMeasurementData> _sessionMeasurements = new List<PatientMeasurementData>();
    // private IDataService _dataService;
    private IPatientInfoService _patientInfoService;
    
    // 测量数据收集
    private bool _isRecording = false;
    
    public PatientSession CurrentSession => _currentSession;
    public bool IsSessionActive => _currentSession != null;
    public bool IsRecording => _isRecording;
    public IReadOnlyList<PatientMeasurementData> SessionMeasurements => _sessionMeasurements.AsReadOnly();
    
    public PatientSessionService()
    {
        // _dataService = ServiceLocator.Get<IDataService>();
        _patientInfoService = ServiceLocator.Get<IPatientInfoService>();
        
        // 监听数据服务的实时数据更新
        // if (_dataService != null)
        // {
            // _dataService.OnBFIValueUpdated += OnBFIUpdated;
            // _dataService.OnBloodFlowValueUpdated += OnBloodFlowUpdated;
            // _dataService.OnBatteryLevelUpdated += OnBatteryUpdated;
        // }
    }
    
    /// <summary>
    /// 启动患者会话
    /// </summary>
    public bool StartSession(PatientInfo patient, string adminUserId)
    {
        if (_currentSession != null)
        {
            Debug.LogWarning("已有活动会话，请先结束当前会话");
            return false;
        }
        
        _currentSession = new PatientSession
        {
            SessionId = System.Guid.NewGuid().ToString(),
            PatientInfo = patient,
            AdminUserId = adminUserId,
            StartTime = DateTime.Now,
            Status = SessionStatus.Started
        };
        
        // 清空之前的测量数据
        _sessionMeasurements.Clear();
        
        // 保存患者信息到服务
        if (_patientInfoService != null)
        {
            _patientInfoService.SetCurrentPatient(patient);
        }
        
        Debug.Log($"患者会话已启动: {patient.Name} (会话ID: {_currentSession.SessionId})");
        OnSessionStarted?.Invoke(_currentSession);
        
        return true;
    }
    
    /// <summary>
    /// 开始测量数据记录
    /// </summary>
    public bool StartMeasurement()
    {
        if (_currentSession == null)
        {
            Debug.LogError("无活动会话，无法开始测量");
            return false;
        }
        
        if (_isRecording)
        {
            Debug.LogWarning("测量已在进行中");
            return false;
        }
        
        _isRecording = true;
        _currentSession.MeasurementStartTime = DateTime.Now;
        _currentSession.Status = SessionStatus.Measuring;
        
        // 启动数据采集
        // if (_dataService != null)
        // {
        //     _dataService.StartDataCollection();
        // }
        
        Debug.Log("开始测量数据记录");
        OnSessionDataUpdated?.Invoke(_currentSession);
        
        return true;
    }
    
    /// <summary>
    /// 停止测量数据记录
    /// </summary>
    public bool StopMeasurement()
    {
        if (!_isRecording)
        {
            Debug.LogWarning("当前没有进行测量");
            return false;
        }
        
        _isRecording = false;
        
        if (_currentSession != null)
        {
            _currentSession.MeasurementEndTime = DateTime.Now;
            _currentSession.Status = SessionStatus.MeasurementComplete;
        }
        
        Debug.Log("测量数据记录已停止");
        OnSessionDataUpdated?.Invoke(_currentSession);
        
        return true;
    }
    
    /// <summary>
    /// 结束患者会话
    /// </summary>
    public bool EndSession()
    {
        if (_currentSession == null)
        {
            Debug.LogWarning("没有活动会话可结束");
            return false;
        }
        
        // 停止测量（如果正在进行）
        if (_isRecording)
        {
            StopMeasurement();
        }
        
        _currentSession.EndTime = DateTime.Now;
        _currentSession.Status = SessionStatus.Completed;
        _currentSession.TotalMeasurements = _sessionMeasurements.Count;
        
        Debug.Log($"患者会话已结束: {_currentSession.PatientInfo.Name}");
        OnSessionEnded?.Invoke(_currentSession);
        
        _currentSession = null;
        
        return true;
    }
    
    /// <summary>
    /// 导出会话数据（包含患者信息和所有测量数据）
    /// </summary>
    public bool ExportSessionData(string filePath)
    {
        if (_currentSession == null)
        {
            Debug.LogError("没有会话数据可导出");
            return false;
        }
        
        try
        {
            var exportData = new PatientSessionExportData
            {
                Session = _currentSession,
                Measurements = _sessionMeasurements.ToArray(),
                ExportTime = DateTime.Now
            };
            
            string extension = Path.GetExtension(filePath).ToLower();
            
            switch (extension)
            {
                case ".json":
                    return ExportToJSON(exportData, filePath);
                case ".csv":
                    return ExportToCSV(exportData, filePath);
                default:
                    Debug.LogError($"不支持的导出格式: {extension}");
                    return false;
            }
        }
        catch (Exception ex)
        {
            Debug.LogError($"导出会话数据失败: {ex.Message}");
            return false;
        }
    }
    
    private bool ExportToJSON(PatientSessionExportData data, string filePath)
    {
        string json = JsonUtility.ToJson(data, true);
        File.WriteAllText(filePath, json, Encoding.UTF8);
        Debug.Log($"会话数据已导出到: {filePath}");
        return true;
    }
    
    private bool ExportToCSV(PatientSessionExportData data, string filePath)
    {
        var csv = new StringBuilder();
        
        // 患者信息
        csv.AppendLine("=== 患者信息 ===");
        csv.AppendLine($"姓名,{data.Session.PatientInfo.Name}");
        csv.AppendLine($"住院号,{data.Session.PatientInfo.HospitalId}");
        csv.AppendLine($"性别,{data.Session.PatientInfo.Gender}");
        csv.AppendLine($"年龄,{data.Session.PatientInfo.Age}");
        csv.AppendLine($"身高,{data.Session.PatientInfo.Height}");
        csv.AppendLine($"体重,{data.Session.PatientInfo.Weight}");
        // csv.AppendLine($"身份证号,{data.Session.PatientInfo.IdNumber}");
        csv.AppendLine();
        
        // 会话信息
        csv.AppendLine("=== 会话信息 ===");
        csv.AppendLine($"会话ID,{data.Session.SessionId}");
        csv.AppendLine($"管理员,{data.Session.AdminUserId}");
        csv.AppendLine($"开始时间,{data.Session.StartTime}");
        csv.AppendLine($"结束时间,{data.Session.EndTime}");
        csv.AppendLine($"测量开始,{data.Session.MeasurementStartTime}");
        csv.AppendLine($"测量结束,{data.Session.MeasurementEndTime}");
        csv.AppendLine($"总测量数,{data.Session.TotalMeasurements}");
        csv.AppendLine();
        
        // 测量数据
        csv.AppendLine("=== 测量数据 ===");
        csv.AppendLine("时间,BFI值,血流指数,电池电量,状态");
        
        foreach (var measurement in data.Measurements)
        {
            csv.AppendLine($"{measurement.Timestamp},{measurement.BFIValue:F2},{measurement.BloodFlowValue:F2},{measurement.BatteryLevel:F1},{measurement.Status}");
        }
        
        File.WriteAllText(filePath, csv.ToString(), Encoding.UTF8);
        Debug.Log($"会话数据已导出到: {filePath}");
        return true;
    }
    
    /// <summary>
    /// 加载会话数据
    /// </summary>
    public PatientSessionExportData LoadSessionData(string filePath)
    {
        try
        {
            if (!File.Exists(filePath))
            {
                Debug.LogError($"文件不存在: {filePath}");
                return null;
            }
            
            string extension = Path.GetExtension(filePath).ToLower();
            
            if (extension == ".json")
            {
                string json = File.ReadAllText(filePath, Encoding.UTF8);
                return JsonUtility.FromJson<PatientSessionExportData>(json);
            }
            else
            {
                Debug.LogError($"暂不支持加载 {extension} 格式的会话数据");
                return null;
            }
        }
        catch (Exception ex)
        {
            Debug.LogError($"加载会话数据失败: {ex.Message}");
            return null;
        }
    }
    
    #region 数据服务事件处理
    
    private void OnBFIUpdated(float value)
    {
        // if (_isRecording && _currentSession != null)
        // {
        //     RecordMeasurement(value, _dataService.CurrentBloodFlow, _dataService.CurrentBatteryLevel);
        // }
    }
    
    private void RecordMeasurement(float bfi, float bloodFlow, float battery)
    {
        var measurement = new PatientMeasurementData
        {
            Timestamp = DateTime.Now,
            BFIValue = bfi,
            BloodFlowValue = bloodFlow,
            BatteryLevel = battery,
            Status = GetMeasurementStatus(bfi, bloodFlow)
        };
        
        _sessionMeasurements.Add(measurement);
        OnMeasurementAdded?.Invoke(measurement);
        
        // 限制内存中的测量数据数量（保留最近1000条）
        if (_sessionMeasurements.Count > 1000)
        {
            _sessionMeasurements.RemoveAt(0);
        }
    }
    
    private string GetMeasurementStatus(float bfi, float bloodFlow)
    {
        // if (bfi < 30f || bfi > 70f)
        //     return "BFI异常";
        // if (bloodFlow < 80f || bloodFlow > 120f)
        //     return "血流异常";
        return "正常";
    }
    

    #endregion
}

/// <summary>
/// 患者会话数据
/// </summary>
[System.Serializable]
public class PatientSession
{
    public string SessionId;
    public PatientInfo PatientInfo;
    public string AdminUserId;
    public DateTime StartTime;
    public DateTime EndTime;
    public DateTime? MeasurementStartTime;
    public DateTime? MeasurementEndTime;
    public SessionStatus Status;
    public int TotalMeasurements;
}

/// <summary>
/// 会话状态
/// </summary>
public enum SessionStatus
{
    Started,        // 已开始
    Measuring,      // 测量中
    MeasurementComplete, // 测量完成
    Completed       // 会话完成
}

/// <summary>
/// 患者测量数据
/// </summary>
[System.Serializable]
public class PatientMeasurementData
{
    public DateTime Timestamp;
    public float BFIValue;
    public float BloodFlowValue;
    public float BatteryLevel;
    public string Status; // 正常、异常等状态
}

/// <summary>
/// 患者会话导出数据
/// </summary>
[System.Serializable]
public class PatientSessionExportData
{
    public PatientSession Session;
    public PatientMeasurementData[] Measurements;
    public DateTime ExportTime;
}