using Laservall.Solidworks.Extension;
using Laservall.Solidworks.Model;
using Laservall.Solidworks.Windows;
using SolidWorks.Interop.sldworks;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;

namespace Laservall.Solidworks.Server
{
    internal sealed class SolidWorksBomDataProvider : IBomDataProvider
    {
        private readonly StaThreadMarshaller _marshaller;

        private static readonly HashSet<string> StaticColumnProps = new HashSet<string>
        {
            "零件名称", "材质", "属性", "材料"
        };

        public SolidWorksBomDataProvider(StaThreadMarshaller marshaller)
        {
            _marshaller = marshaller ?? throw new ArgumentNullException(nameof(marshaller));
        }

        public async Task<BomLoadResult> LoadBomAsync(IProgress<BomLoadProgress> progress, CancellationToken ct)
        {
            return await _marshaller.InvokeAsync(async () =>
            {
                ModelDoc2 model = SWUtils.SwApp.ActiveDoc as ModelDoc2;
                if (model == null)
                {
                    return new BomLoadResult
                    {
                        Items = new List<BomItemModel>(),
                        DynamicKeys = new List<string>(),
                        Settings = BomSettings.Load()
                    };
                }

                Configuration config = model.ConfigurationManager.ActiveConfiguration;

                var rootTree = new SwAssDocTreeModel
                {
                    drawingNo = Path.GetFileNameWithoutExtension(model.GetPathName()),
                    docPath = model.GetPathName(),
                    configName = config?.Name ?? "",
                    children = new List<SwAssDocTreeModel>(),
                    isAss = true,
                    quantity = 1,
                    props = SWUtils.GetConfig3(model.GetPathName())
                };

                Component2 rootComponent = config?.GetRootComponent3(true) as Component2;
                int totalCount = GetTotalComponentCount(model);

                if (HasLightweightComponents(model))
                {
                    ResolvingProgressWindow.RunWithProgress(() =>
                    {
                        SWUtils.SetAllPartResolved(model.GetPathName());
                    });
                }

                if (rootComponent != null)
                {
                    IProgress<SwTreeLoadProgress> swProgress = null;
                    if (progress != null)
                    {
                        swProgress = new Progress<SwTreeLoadProgress>(p =>
                        {
                            progress.Report(new BomLoadProgress
                            {
                                Processed = p.Processed,
                                Total = p.Total,
                                CurrentName = p.CurrentName
                            });
                        });
                    }

                    var parts = await SWUtils.GetSwAssDocTreeChildrenAsync(
                        rootComponent, true, true, totalCount, swProgress);
                    rootTree.children.AddRange(parts);
                }

                var allItems = SWUtils.FlattenBomTree(rootTree);
                var propKeys = SWUtils.CollectAllPropertyKeys(allItems);

                var dynamicKeys = propKeys
                    .Where(k => !StaticColumnProps.Contains(k))
                    .OrderBy(k => k)
                    .ToList();

                var settings = BomSettings.Load();
                settings.MergeDynamicKeys(dynamicKeys);

                var userAddedKeys = settings.Columns
                    .Where(c => c.IsUserAdded && !dynamicKeys.Contains(c.Name))
                    .Select(c => c.Name)
                    .ToList();
                dynamicKeys.AddRange(userAddedKeys);

                EnsurePropsKeys(allItems, dynamicKeys);

                return new BomLoadResult
                {
                    Items = allItems,
                    DynamicKeys = dynamicKeys,
                    Settings = settings
                };
            });
        }

        public SaveResult SaveChanges(List<ChangeItem> changes)
        {
            if (changes == null || changes.Count == 0)
            {
                return new SaveResult { Success = true, SavedCount = 0 };
            }

            return _marshaller.Invoke(() =>
            {
                try
                {
                    var grouped = changes
                        .Where(c => !string.IsNullOrEmpty(c.DocPath) && !string.IsNullOrEmpty(c.Key))
                        .GroupBy(c => c.DocPath);

                    int savedCount = 0;
                    foreach (var group in grouped)
                    {
                        ModelDoc2 doc = SWUtils.OpenDocSilently(group.Key);
                        if (doc == null) continue;

                        Configuration activeConfig = doc.ConfigurationManager?.ActiveConfiguration;
                        CustomPropertyManager configPropMgr = activeConfig?.CustomPropertyManager;

                        CustomPropertyManager filePropMgr = null;
                        try
                        {
                            filePropMgr = doc.Extension?.get_CustomPropertyManager("");
                        }
                        catch { }

                        foreach (var change in group)
                        {
                            bool writtenToConfig = false;
                            if (configPropMgr != null)
                            {
                                var configNames = configPropMgr.GetNames() as string[];
                                if (configNames != null && configNames.Contains(change.Key))
                                {
                                    configPropMgr.Set2(change.Key, change.Value ?? "");
                                    writtenToConfig = true;
                                }
                            }

                            if (!writtenToConfig && filePropMgr != null)
                            {
                                filePropMgr.Set2(change.Key, change.Value ?? "");
                            }
                            else if (!writtenToConfig && configPropMgr != null)
                            {
                                configPropMgr.Set2(change.Key, change.Value ?? "");
                            }
                        }

                        doc.Save3(0, 0, 0);
                        savedCount++;
                    }

                    return new SaveResult { Success = true, SavedCount = savedCount };
                }
                catch (Exception ex)
                {
                    return new SaveResult { Success = false, Error = ex.Message };
                }
            });
        }

        public BomSettings GetSettings()
        {
            return BomSettings.Load();
        }

        public void SaveSettings(BomSettings settings)
        {
            settings?.Save();
        }

        public List<BomItemModel> GetFlatBomItems(List<BomItemModel> allItems)
        {
            return allItems
                .Where(i => !i.IsAssembly)
                .GroupBy(i => i.DrawingNo ?? "")
                .Select(g =>
                {
                    var first = g.First();
                    return new BomItemModel
                    {
                        Level = 0,
                        LevelDisplay = "",
                        DrawingNo = first.DrawingNo,
                        ConfigName = first.ConfigName,
                        PartName = first.PartName,
                        MaterialProp = first.MaterialProp,
                        Material = first.Material,
                        Classification = first.Classification,
                        Quantity = g.Sum(x => x.Quantity),
                        IsAssembly = false,
                        IsOutSourcing = first.IsOutSourcing,
                        DocPath = first.DocPath,
                        Props = first.Props,
                        HasChildren = false,
                        IsExpanded = false,
                        IsVisible = true
                    };
                })
                .ToList();
        }

        private static void EnsurePropsKeys(List<BomItemModel> items, List<string> keys)
        {
            foreach (var item in items)
            {
                if (item.Props == null)
                {
                    item.Props = new Dictionary<string, string>();
                }
                foreach (var key in keys)
                {
                    if (!item.Props.ContainsKey(key))
                    {
                        item.Props[key] = "";
                    }
                }
            }
        }

        private static int GetTotalComponentCount(ModelDoc2 model)
        {
            AssemblyDoc assembly = model as AssemblyDoc;
            if (assembly == null)
            {
                return 1;
            }

            object[] components = assembly.GetComponents(false) as object[];
            return Math.Max((components?.Length ?? 0) + 1, 1);
        }

        private static bool HasLightweightComponents(ModelDoc2 model)
        {
            AssemblyDoc assembly = model as AssemblyDoc;
            if (assembly == null) return false;

            object[] components = assembly.GetComponents(false) as object[];
            if (components == null) return false;

            foreach (object obj in components)
            {
                Component2 comp = obj as Component2;
                if (comp == null) continue;
                int state = comp.GetSuppression();
                // swComponentLightweight = 4, swComponentFullyLightweight = 8
                if (state == 4 || state == 8) return true;
            }
            return false;
        }
    }
}