using Prism.Commands;
using Prism.Events;
using Prism.Mvvm;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using Txgy.EWS.Client.Common;
using Txgy.EWS.Client.Common.MessageEvents;
using Txgy.EWS.Client.Entity;

namespace Txgy.EWS.Client.SysModule.ViewModels
{
    public class SystemSettingsViewModel : BindableBase
    {
        private const string AdvancedSettingsTargetView = "SystemSettingsAdvanced";
        private static readonly string[] AdvancedSettingsFallbackTargetViews =
        {
            "MenuManagementView",
            "RoleManagementView",
            "UserManagementView"
        };

        private readonly IEventAggregator _eventAggregator;
        private string _statusMessage;
        private Brush _statusBrush = Brushes.Gray;

        public SystemSettingsViewModel(IEventAggregator eventAggregator)
        {
            _eventAggregator = eventAggregator;
            CanEditAdvancedSettings = HasAdvancedSettingsPermission();
            ReloadFromConfig();
        }

        public string ConfigPath => BusinessConfigManager.ConfigPath;

        public string StatusMessage
        {
            get => _statusMessage;
            set => SetProperty(ref _statusMessage, value);
        }

        public Brush StatusBrush
        {
            get => _statusBrush;
            set => SetProperty(ref _statusBrush, value);
        }

        public bool CanEditAdvancedSettings { get; }
        public Visibility AdvancedSettingsVisibility => CanEditAdvancedSettings ? Visibility.Visible : Visibility.Collapsed;

        public string ApiDomain { get; set; }
        public string AlarmSetting { get; set; }
        public string AlarmLevelConfig { get; set; }
        public string ReportEventLevelSetting { get; set; }
        public string WorkAreaFilePath { get; set; }
        public string StationsCsvFilePath { get; set; }
        public string CadDwgFilePath { get; set; }
        public string DwgJsonSetting { get; set; }
        public string WavesMseedFilePath { get; set; }
        public string WavesTxtFilePath { get; set; }
        public string LocalSqLiteDb { get; set; }
        public string DwgSettings { get; set; }
        public string CadSettingsFileName { get; set; }
        public bool IsDesign { get; set; }
        public bool IsRealtime { get; set; }
        public string RefreshInterval { get; set; }
        public string DataLookbackHours { get; set; }
        public string DataCacheTimeLenMins { get; set; }
        public string TencentMySql { get; set; }
        public string RealtimeResultTable { get; set; }
        public string RealtimeWaveDataTable { get; set; }
        public string RealtimeFocalmechanismTable { get; set; }
        public string PostResultTable { get; set; }
        public string PostWaveDataTable { get; set; }
        public string PostFocalmechanismTable { get; set; }
        public string CommpanyName { get; set; }
        public string SystemNameCn { get; set; }
        public string SystemNameEn { get; set; }
        public string WorkAreaName { get; set; }
        public string SystemShortName { get; set; }
        public string DailyReportStartTime { get; set; }
        public string DailyReportPlanOffsetX { get; set; }
        public string DailyReportPlanOffsetY { get; set; }
        public string BaseX { get; set; }
        public string BaseY { get; set; }
        public string BaseZ { get; set; }

        public ICommand ReloadCommand => new DelegateCommand(ReloadFromConfig);
        public ICommand ApplyCommand => new DelegateCommand(ApplyConfig);

        private void ReloadFromConfig()
        {
            try
            {
                Load(BusinessConfigManager.Read());
                SetStatus("已读取最新配置", Brushes.Gray);
            }
            catch (Exception ex)
            {
                SetStatus($"读取配置失败：{ex.Message}", Brushes.Red);
            }
        }

        private void ApplyConfig()
        {
            try
            {
                var previousConfig = BusinessConfigManager.Current;
                var config = BuildConfig(previousConfig);
                var savedConfig = BusinessConfigManager.Save(config);
                var shouldReloadWarningData = ShouldReloadWarningData(previousConfig, savedConfig);
                GlobalConfig.ApplyBusinessConfig(savedConfig);
                _eventAggregator.GetEvent<BusinessConfigChangedEvent>().Publish(savedConfig);
                if (shouldReloadWarningData)
                {
                    _eventAggregator.GetEvent<ReloadWarningDataEvent>().Publish();
                }
                Load(savedConfig);
                SetStatus($"配置已应用：{DateTime.Now:HH:mm:ss}", Brushes.Green);
            }
            catch (Exception ex)
            {
                SetStatus($"应用失败：{ex.Message}", Brushes.Red);
            }
        }

        private bool ShouldReloadWarningData(BusinessConfig previousConfig, BusinessConfig savedConfig)
        {
            if (previousConfig?.Runtime == null || savedConfig?.Runtime == null)
            {
                return false;
            }

            return previousConfig.Runtime.DataLookbackHours != savedConfig.Runtime.DataLookbackHours;
        }

        private void Load(BusinessConfig config)
        {
            ApiDomain = config.Endpoints.ApiDomain;
            AlarmSetting = config.Paths.AlarmSetting;
            AlarmLevelConfig = config.Paths.AlarmLevelConfig;
            ReportEventLevelSetting = config.Paths.ReportEventLevelSetting;
            WorkAreaFilePath = config.Paths.WorkAreaFilePath;
            StationsCsvFilePath = config.Paths.StationsCsvFilePath;
            CadDwgFilePath = config.Paths.CadDwgFilePath;
            DwgJsonSetting = config.Paths.DwgJsonSetting;
            WavesMseedFilePath = config.Paths.WavesMseedFilePath;
            WavesTxtFilePath = config.Paths.WavesTxtFilePath;
            LocalSqLiteDb = config.Paths.LocalSqLiteDb;
            DwgSettings = config.Paths.DwgSettings;
            CadSettingsFileName = config.Paths.CadSettingsFileName;
            IsDesign = config.Runtime.IsDesign;
            IsRealtime = config.Runtime.IsRealtime;
            RefreshInterval = config.Runtime.RefreshInterval.ToString(CultureInfo.InvariantCulture);
            DataLookbackHours = config.Runtime.DataLookbackHours.ToString("0.##", CultureInfo.InvariantCulture);
            DataCacheTimeLenMins = config.Runtime.DataCacheTimeLenMins.ToString(CultureInfo.InvariantCulture);
            TencentMySql = GetConnection(config, "TencetnMySQL");
            RealtimeResultTable = config.Database.Tables.RealtimeResultTable;
            RealtimeWaveDataTable = config.Database.Tables.RealtimeWaveDataTable;
            RealtimeFocalmechanismTable = config.Database.Tables.RealtimeFocalmechanismTable;
            PostResultTable = config.Database.Tables.PostResultTable;
            PostWaveDataTable = config.Database.Tables.PostWaveDataTable;
            PostFocalmechanismTable = config.Database.Tables.PostFocalmechanismTable;
            CommpanyName = config.Branding.CommpanyName;
            SystemNameCn = config.Branding.SystemNameCn;
            SystemNameEn = config.Branding.SystemNameEn;
            WorkAreaName = config.Branding.WorkAreaName;
            SystemShortName = config.Branding.SystemShortName;
            DailyReportStartTime = config.Report.DailyReportStartTime;
            DailyReportPlanOffsetX = config.Report.DailyReportPlanOffsetX.ToString(CultureInfo.InvariantCulture);
            DailyReportPlanOffsetY = config.Report.DailyReportPlanOffsetY.ToString(CultureInfo.InvariantCulture);
            BaseX = config.Coordinates.BaseX.ToString(CultureInfo.InvariantCulture);
            BaseY = config.Coordinates.BaseY.ToString(CultureInfo.InvariantCulture);
            BaseZ = config.Coordinates.BaseZ.ToString(CultureInfo.InvariantCulture);
            RaiseAllSettingPropertiesChanged();
        }

        private BusinessConfig BuildConfig(BusinessConfig currentConfig)
        {
            DateTime.Parse(Require(DailyReportStartTime, "日报起始时间"));

            var dataLookbackHours = ParseDouble(DataLookbackHours, "数据回看时长");
            DataCacheTimeLenMins = ((int)Math.Round(dataLookbackHours * 60.0)).ToString(CultureInfo.InvariantCulture);
            var endpointSettings = BuildEndpointSettings(currentConfig);
            var databaseSettings = BuildDatabaseSettings(currentConfig);

            return new BusinessConfig
            {
                Endpoints = endpointSettings,
                Paths = new PathSettings
                {
                    AlarmSetting = Require(AlarmSetting, "报警配置"),
                    AlarmLevelConfig = Require(AlarmLevelConfig, "报警等级配置"),
                    ReportEventLevelSetting = Require(ReportEventLevelSetting, "报表事件分级"),
                    WorkAreaFilePath = Require(WorkAreaFilePath, "工区配置"),
                    StationsCsvFilePath = Require(StationsCsvFilePath, "台站 CSV"),
                    CadDwgFilePath = Require(CadDwgFilePath, "CAD DWG"),
                    DwgJsonSetting = Require(DwgJsonSetting, "DWG 图层配置"),
                    WavesMseedFilePath = Require(WavesMseedFilePath, "Mseed 缓存目录"),
                    WavesTxtFilePath = Require(WavesTxtFilePath, "Txt 缓存目录"),
                    LocalSqLiteDb = CanEditAdvancedSettings ? Require(LocalSqLiteDb, "本地 SQLite") : currentConfig.Paths.LocalSqLiteDb,
                    DwgSettings = EmptyToNull(DwgSettings),
                    CadSettingsFileName = EmptyToNull(CadSettingsFileName)
                },
                Runtime = new RuntimeSettings
                {
                    IsDesign = CanEditAdvancedSettings ? IsDesign : currentConfig.Runtime.IsDesign,
                    IsRealtime = CanEditAdvancedSettings ? IsRealtime : currentConfig.Runtime.IsRealtime,
                    RefreshInterval = ParseInt(RefreshInterval, "刷新间隔"),
                    DataLookbackHours = dataLookbackHours,
                    DataCacheTimeLenMins = ParseInt(DataCacheTimeLenMins, "数据缓存时长")
                },
                Database = databaseSettings,
                Branding = new BrandingSettings
                {
                    CommpanyName = Require(CommpanyName, "公司名称"),
                    SystemNameCn = Require(SystemNameCn, "系统中文名"),
                    SystemNameEn = Require(SystemNameEn, "系统英文名"),
                    WorkAreaName = Require(WorkAreaName, "工区名称"),
                    SystemShortName = Require(SystemShortName, "系统简称")
                },
                Report = new ReportSettings
                {
                    DailyReportStartTime = DailyReportStartTime.Trim(),
                    DailyReportPlanOffsetX = ParseDouble(DailyReportPlanOffsetX, "平面图横向偏移"),
                    DailyReportPlanOffsetY = ParseDouble(DailyReportPlanOffsetY, "平面图纵向偏移")
                },
                Coordinates = new CoordinateSettings
                {
                    BaseX = ParseDouble(BaseX, "BaseX"),
                    BaseY = ParseDouble(BaseY, "BaseY"),
                    BaseZ = ParseDouble(BaseZ, "BaseZ")
                }
            };
        }

        private EndpointSettings BuildEndpointSettings(BusinessConfig currentConfig)
        {
            return new EndpointSettings
            {
                ApiDomain = CanEditAdvancedSettings ? Require(ApiDomain, "API 域名") : currentConfig.Endpoints.ApiDomain
            };
        }

        private DatabaseSettings BuildDatabaseSettings(BusinessConfig currentConfig)
        {
            if (!CanEditAdvancedSettings)
            {
                return new DatabaseSettings
                {
                    Connections = new Dictionary<string, string>
                    {
                        { "TencetnMySQL", GetConnection(currentConfig, "TencetnMySQL") }
                    },
                    Tables = CopyTableSettings(currentConfig.Database.Tables)
                };
            }

            return new DatabaseSettings
            {
                Connections = new Dictionary<string, string>
                {
                    { "TencetnMySQL", Require(TencentMySql, "腾讯 MySQL") }
                },
                Tables = new TableSettings
                {
                    RealtimeResultTable = Require(RealtimeResultTable, "实时结果表"),
                    RealtimeWaveDataTable = Require(RealtimeWaveDataTable, "实时波形表"),
                    RealtimeFocalmechanismTable = Require(RealtimeFocalmechanismTable, "实时震源机制表"),
                    PostResultTable = Require(PostResultTable, "后处理结果表"),
                    PostWaveDataTable = Require(PostWaveDataTable, "后处理波形表"),
                    PostFocalmechanismTable = Require(PostFocalmechanismTable, "后处理震源机制表")
                }
            };
        }

        private TableSettings CopyTableSettings(TableSettings source)
        {
            return new TableSettings
            {
                RealtimeResultTable = source.RealtimeResultTable,
                RealtimeWaveDataTable = source.RealtimeWaveDataTable,
                RealtimeFocalmechanismTable = source.RealtimeFocalmechanismTable,
                PostResultTable = source.PostResultTable,
                PostWaveDataTable = source.PostWaveDataTable,
                PostFocalmechanismTable = source.PostFocalmechanismTable
            };
        }

        private string GetConnection(BusinessConfig config, string name)
        {
            if (config.Database.Connections != null && config.Database.Connections.TryGetValue(name, out var value))
            {
                return value;
            }

            return string.Empty;
        }

        private bool HasAdvancedSettingsPermission()
        {
            var menus = GlobalData.CurrentUserInfo?.Menus;
            if (menus == null)
            {
                return false;
            }

            return ContainsTargetView(menus, AdvancedSettingsTargetView) ||
                   AdvancedSettingsFallbackTargetViews.Any(targetView => ContainsTargetView(menus, targetView));
        }

        private bool ContainsTargetView(IEnumerable<MenuEntity> menus, string targetView)
        {
            return menus.Any(menu => string.Equals(menu.TargetView, targetView, StringComparison.OrdinalIgnoreCase));
        }

        private string Require(string value, string name)
        {
            if (string.IsNullOrWhiteSpace(value))
            {
                throw new InvalidOperationException($"{name}不能为空");
            }

            return value.Trim();
        }

        private string EmptyToNull(string value)
        {
            return string.IsNullOrWhiteSpace(value) ? null : value.Trim();
        }

        private int ParseInt(string value, string name)
        {
            if (!int.TryParse(Require(value, name), NumberStyles.Integer, CultureInfo.InvariantCulture, out var result))
            {
                throw new InvalidOperationException($"{name}必须是整数");
            }

            return result;
        }

        private double ParseDouble(string value, string name)
        {
            if (!double.TryParse(Require(value, name), NumberStyles.Float, CultureInfo.InvariantCulture, out var result))
            {
                throw new InvalidOperationException($"{name}必须是数字");
            }

            return result;
        }

        private void SetStatus(string message, Brush brush)
        {
            StatusMessage = message;
            StatusBrush = brush;
        }

        private void RaiseAllSettingPropertiesChanged()
        {
            RaisePropertyChanged(nameof(ApiDomain));
            RaisePropertyChanged(nameof(AlarmSetting));
            RaisePropertyChanged(nameof(AlarmLevelConfig));
            RaisePropertyChanged(nameof(ReportEventLevelSetting));
            RaisePropertyChanged(nameof(WorkAreaFilePath));
            RaisePropertyChanged(nameof(StationsCsvFilePath));
            RaisePropertyChanged(nameof(CadDwgFilePath));
            RaisePropertyChanged(nameof(DwgJsonSetting));
            RaisePropertyChanged(nameof(WavesMseedFilePath));
            RaisePropertyChanged(nameof(WavesTxtFilePath));
            RaisePropertyChanged(nameof(LocalSqLiteDb));
            RaisePropertyChanged(nameof(DwgSettings));
            RaisePropertyChanged(nameof(CadSettingsFileName));
            RaisePropertyChanged(nameof(IsDesign));
            RaisePropertyChanged(nameof(IsRealtime));
            RaisePropertyChanged(nameof(RefreshInterval));
            RaisePropertyChanged(nameof(DataLookbackHours));
            RaisePropertyChanged(nameof(DataCacheTimeLenMins));
            RaisePropertyChanged(nameof(TencentMySql));
            RaisePropertyChanged(nameof(RealtimeResultTable));
            RaisePropertyChanged(nameof(RealtimeWaveDataTable));
            RaisePropertyChanged(nameof(RealtimeFocalmechanismTable));
            RaisePropertyChanged(nameof(PostResultTable));
            RaisePropertyChanged(nameof(PostWaveDataTable));
            RaisePropertyChanged(nameof(PostFocalmechanismTable));
            RaisePropertyChanged(nameof(CommpanyName));
            RaisePropertyChanged(nameof(SystemNameCn));
            RaisePropertyChanged(nameof(SystemNameEn));
            RaisePropertyChanged(nameof(WorkAreaName));
            RaisePropertyChanged(nameof(SystemShortName));
            RaisePropertyChanged(nameof(DailyReportStartTime));
            RaisePropertyChanged(nameof(DailyReportPlanOffsetX));
            RaisePropertyChanged(nameof(DailyReportPlanOffsetY));
            RaisePropertyChanged(nameof(BaseX));
            RaisePropertyChanged(nameof(BaseY));
            RaisePropertyChanged(nameof(BaseZ));
        }
    }
}