using System;
using System.Collections.Generic;
using TellmePdmsPluging.Models;
using Aveva.ApplicationFramework;
using Aveva.Pdms.Database;

namespace TellmePdmsPluging.Core
{
    public class PdmsManager
    {
        private static PdmsManager _instance;
        private static readonly object _lock = new object();

        public static PdmsManager Instance
        {
            get
            {
                if (_instance == null)
                {
                    lock (_lock)
                    {
                        if (_instance == null)
                            _instance = new PdmsManager();
                    }
                }
                return _instance;
            }
        }

        private PdmsManager()
        {
        }

        public ModelStatusResponse GetModelStatus()
        {
            try
            {
                // 检查PDMS是否连接
                if (!IsPdmsConnected())
                {
                    return new ModelStatusResponse
                    {
                        ModelLoaded = false
                    };
                }

                return new ModelStatusResponse
                {
                    ModelLoaded = true,
                    ProjectInfo = GetProjectInfo(),
                    ModelStatistics = GetModelStatistics(),
                    SessionInfo = GetSessionInfo()
                };
            }
            catch (Exception ex)
            {
                // 记录错误日志
                System.Diagnostics.Debug.WriteLine($"获取PDMS模型状态失败: {ex.Message}");
                return new ModelStatusResponse
                {
                    ModelLoaded = false
                };
            }
        }

        private bool IsPdmsConnected()
        {
            try
            {
                // 使用MDB.CurrentMDB检查PDMS连接状态
                var currentMdb = MDB.CurrentMDB;
                return currentMdb != null;
            }
            catch
            {
                return false;
            }
        }

        private ProjectInfo GetProjectInfo()
        {
            try
            {
                // 使用MDB.CurrentMDB和Project.CurrentProject获取真实项目信息
                var currentMdb = MDB.CurrentMDB;
                var currentProject = Project.CurrentProject;
                
                if (currentMdb != null)
                {
                    var designDb = currentMdb.GetFirstDB(DbType.Design);
                    if (designDb != null)
                    {
                        return new ProjectInfo
                        {
                            ProjectName = designDb.Name ?? "Unknown",
                            MdsName = currentMdb.Name ?? "Unknown", 
                            PdmsVersion = "12.1.SP4"
                        };
                    }
                }
                
                return new ProjectInfo
                {
                    ProjectName = "Unknown",
                    MdsName = "Unknown", 
                    PdmsVersion = "12.1.SP4"
                };
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"获取项目信息失败: {ex.Message}");
                return new ProjectInfo
                {
                    ProjectName = "Unknown",
                    MdsName = "Unknown",
                    PdmsVersion = "12.1.SP4"
                };
            }
        }



        private ModelStatistics GetModelStatistics()
        {
            try
            {
                // 使用MDB.CurrentMDB获取真实模型统计信息
                var currentMdb = MDB.CurrentMDB;
                if (currentMdb != null)
                {
                    var designDb = currentMdb.GetFirstDB(DbType.Design);
                    if (designDb?.World != null)
                    {
                        // 获取真实的元素统计信息
                        var worldMembers = designDb.WorldMembers();
                        var elementCounts = new Dictionary<string, int>
                        {
                            {"PIPE", 0}, {"EQUI", 0}, {"STRU", 0}, 
                            {"VALVE", 0}, {"FITT", 0}, {"NOZZ", 0}
                        };
                        
                        int totalElements = 0;
                        var activeZones = new List<string>();
                        
                        // 遍历World的直接子元素进行统计
                        if (worldMembers != null)
                        {
                            foreach (var element in worldMembers)
                            {
                                if (element != null && !element.IsNull && element.IsValid)
                                {
                                    totalElements++;
                                    // 这里需要获取元素类型，可能需要进一步的API调用来判断具体类型
                                    // 暂时先统计总数
                                }
                            }
                        }
                        
                        return new ModelStatistics
                        {
                            TotalElements = totalElements,
                            ElementCounts = elementCounts,
                            ZoneCount = 0,      // Zone统计需要额外的API
                            ActiveZones = activeZones
                        };
                    }
                }
                
                return new ModelStatistics
                {
                    TotalElements = 0,
                    ElementCounts = new Dictionary<string, int>(),
                    ZoneCount = 0,
                    ActiveZones = new List<string>()
                };
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"获取模型统计信息失败: {ex.Message}");
                return new ModelStatistics
                {
                    TotalElements = 0,
                    ElementCounts = new Dictionary<string, int>(),
                    ZoneCount = 0,
                    ActiveZones = new List<string>()
                };
            }
        }

        private SessionInfo GetSessionInfo()
        {
            try
            {
                // 使用MDB.CurrentMDB获取真实会话信息
                var currentMdb = MDB.CurrentMDB;
                if (currentMdb != null)
                {
                    var designDb = currentMdb.GetFirstDB(DbType.Design);
                    if (designDb?.CurrentSession != null)
                    {
                        // 从真实的数据库会话获取信息
                        var session = designDb.CurrentSession;
                        return new SessionInfo
                        {
                            UserName = session.User ?? Environment.UserName, // 从DbSession获取用户名
                            StartTime = session.Date, // 从DbSession获取会话创建时间
                            DurationMinutes = (int)(DateTime.Now - session.Date).TotalMinutes // 计算会话持续时间
                        };
                    }
                }
                
                return new SessionInfo
                {
                    UserName = Environment.UserName,
                    StartTime = DateTime.Now,
                    DurationMinutes = 0
                };
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"获取会话信息失败: {ex.Message}");
                return new SessionInfo
                {
                    UserName = Environment.UserName,
                    StartTime = DateTime.Now,
                    DurationMinutes = 0
                };
            }
        }



    }
}