using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Controls;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using CommunityToolkit.Mvvm.Messaging;
using ExcelHelper.Message;
using ExcelHelper.Model;
using ExcelHelper.Utils;
using MiniExcelLibs;
using MiniExcelLibs.OpenXml;
using SqlSugar;

namespace ExcelHelper.Views.ViewModels;


public partial class ImportViewModel : ObservableRecipient, IViewModel
{

    public Task FileDrop(string[] files)
    {
        IsLoading = true;
        ExcelFiles.Clear();
        SelectedSheetName = null;
        Sheets.Clear();
        MaxRow = 0;
        foreach (var item in files)
        {
            if(!item.EndsWith(".xlsx") && !item.EndsWith(".xls"))
            {
                WeakReferenceMessenger.Default.Send(new ErrorDialogMessage("请拖入Excel文件!"));
                IsLoading = false;
                return Task.CompletedTask;
            }
            ExcelFiles.Add(item);
        }
        //ReadForExcel(ExcelFiles.First());
        CurrentFilePath = ExcelFiles.FirstOrDefault();
        IsLoading = false;
        return Task.CompletedTask;
    }

    public async void ReadForExcel(string path, bool isReload = false)
    {
        IsLoading = true;
        //await Task.Factory.StartNew(async () =>
        //{
        try
        {
            var config = new OpenXmlConfiguration()
            {
                FillMergedCells = FillMergedCells
            };
            if (string.IsNullOrEmpty(path))
            {
                IsLoading = false;
                return;
            }
            var excelData = await GetExcelData(path, config);
            if (MaxRow != 0)
            {
                ExcelData = excelData.Take(Math.Min(MaxRow, 300));
            }
            else
            {
                ExcelData = excelData.Take(300);
            }
            var currentSheetName = SelectedSheetName;
            var columns = MiniExcel.GetColumns(path, useHeaderRow: UseHeaderRow, startCell: StartCell, sheetName: currentSheetName, configuration: config);

            GenColumns(columns);

            GetSheets(path);
            if (string.IsNullOrEmpty(currentSheetName))
            {
                SelectedSheetName = Sheets.FirstOrDefault();
            }
            else
            {
                SelectedSheetName = Sheets.FirstOrDefault(it => it.Equals(currentSheetName));
            }
            MaxRow = ExcelData.Count();

            PromptString = Excel2Prompt.ConverterToPrompt(ExcelData, columns);
        }
        catch (Exception ex)
        {
            WeakReferenceMessenger.Default.Send(new ErrorDialogMessage($"出现了异常!{ex}"));
        }
        IsLoading = false;
    }
    public async Task<IEnumerable<dynamic>> GetExcelData(string path, Configuration config)
    {

        return string.IsNullOrEmpty(EndCell)
            ? await MiniExcel.QueryAsync(path, sheetName: SelectedSheetName, useHeaderRow: UseHeaderRow, startCell: StartCell, configuration: config)
            : MiniExcel.QueryRange(path, sheetName: SelectedSheetName, useHeaderRow: UseHeaderRow, startCell: StartCell, endCell: EndCell, configuration: config);
    }


    private void GenColumns(IEnumerable<string> columns)
    {
        ExcelColumns.Clear();
        TableColumns.Clear();
        if (UseHeaderRow)
        {
            foreach (var columnName in columns)
            {
                var column = new DataGridTextColumn
                {
                    Header = columnName,
                    Binding = new System.Windows.Data.Binding($"{columnName}"),
                    Width = DataGridLength.Auto
                };
                ExcelColumns.Add(column);
            }
        }
        else
        {
            for (var i = 'A'; i < 'Z'; i++)
            {
                var column = new DataGridTextColumn
                {
                    Header = $"{i}",
                    Binding = new System.Windows.Data.Binding($"{i}"),
                    Width = DataGridLength.Auto
                };
                ExcelColumns.Add(column);
            }
        }
        int columnsSeq = 0;
        foreach (var item in ExcelColumns)
        {
            TableColumns.Add(new TableColumnModel
            {
                ExcelColumnName = item.Header.ToString(),
                TableColumnName = $"Column{columnsSeq}",
            });
            columnsSeq++;
        }
        if (ExcelColumns.Count > 0)
        {
            WeakReferenceMessenger.Default.Send(new UpdateDataGridColumnsMessage([.. ExcelColumns]));
        }
        else
        {
            WeakReferenceMessenger.Default.Send(new ErrorDialogMessage("未读取到列信息!"));
        }
    }

    [RelayCommand]
    private void OnReLoadExcel()
    {
        ReadForExcel(CurrentFilePath, isReload: true);
    }
    [RelayCommand]
    private void OnReadSheets()
    {
        if (!string.IsNullOrWhiteSpace(CurrentFilePath))
        {
            GetSheets(CurrentFilePath);
            SelectedSheetName = Sheets.FirstOrDefault();

        }
    }
    private void GetSheets(string excelPath)
    {
        var sheets = MiniExcel.GetSheetNames(excelPath);
        if (Sheets == null)
        {
            Sheets = [];
        }
        else
        {
            Sheets.Clear();
        }

        sheets.ForEach(sheetName =>
        {
            Sheets.Add(sheetName);
        });
    }

    [RelayCommand]
    private void OnTestDbConn()
    {
        try
        {
            var client = GetClient();
            var tables = client.Ado.ExecuteCommand("select 1");
            WeakReferenceMessenger.Default.Send(new ErrorDialogMessage("连接成功!"));
        }
        catch (Exception ex)
        {
            WeakReferenceMessenger.Default.Send(new ErrorDialogMessage($"连接失败!{ex}"));
        }
    }

    private SqlSugarClient GetClient()
    {
        var connStr = GetConnStr(DbType);
        if (string.IsNullOrEmpty(connStr))
        {
            WeakReferenceMessenger.Default.Send(new ErrorDialogMessage("未知的数据库类型!"));
            return null;
        }
        try
        {
            var client = new SqlSugarClient(new ConnectionConfig
            {
                ConnectionString = connStr,
                DbType = DbType switch
                {
                    //"MySql" => SqlSugar.DbType.MySql,
                    "Sqlite" => SqlSugar.DbType.Sqlite,
                    "SqlServer" => SqlSugar.DbType.SqlServer,
                    _ => throw new Exception("未知的数据库类型")
                },
                IsAutoCloseConnection = true
            });
            return client;
            //WeakReferenceMessenger.Default.Send(new ErrorDialogMessage("连接成功!"));
        }
        catch (Exception ex)
        {
            WeakReferenceMessenger.Default.Send(new ErrorDialogMessage($"连接失败!{ex}"));
            return null;
        }
    }


    private string GetConnStr(string dbType)
    {
        var encryptStr = "";
        if (IsEncrypt)
        {
            encryptStr = "Encrypt=True;TrustServerCertificate=True;";
        }

        return dbType switch
        {
            //"MySql" => $"Server={DbServer};Port={DbPort};Database={DbName};User Id={DbUser};Password={DbPassword};{encryptStr}",
            "SqlServer" => $"Server={DbServer},{DbPort};Database={DbName};User Id={DbUser};Password={DbPassword};{encryptStr}",
            //"PostgreSql" => $"Server={DbServer};Port={DbPort};Database={DbName};User Id={DbUser};Password={DbPassword};{encryptStr}",
            "Sqlite" => $"DataSource={DbServer};",
            _ => ""
        };
    }

    #region Props
    [ObservableProperty]
    private IEnumerable<dynamic> _excelData;

    [ObservableProperty]
    private ObservableCollection<string> _excelFiles = [];

    [ObservableProperty]
    private ObservableCollection<DataGridColumn> _excelColumns = [];

    [ObservableProperty]
    private ObservableCollection<TableColumnModel> _tableColumns = [];

    /// <summary>
    /// 是否正在加载
    /// </summary>
    [ObservableProperty]
    private bool _isLoading = false;

    /// <summary>
    /// 使用首行作为表头
    /// </summary>
    [ObservableProperty]
    private bool _useHeaderRow = false;

    /// <summary>
    /// 选中的Sheet
    /// </summary>
    [ObservableProperty]
    private string _selectedSheetName;

    /// <summary>
    /// Sheets列表
    /// </summary>
    [ObservableProperty]
    private ObservableCollection<string> _sheets = [];
    /// <summary>
    /// 起始位置
    /// </summary>
    [ObservableProperty]
    private string _startCell = "A1";
    /// <summary>
    /// 结束位置
    /// </summary>
    [ObservableProperty]
    private string _endCell;

    /// <summary>
    /// 使用首行作为表头
    /// </summary>
    [ObservableProperty]
    private bool _fillMergedCells = false;

    /// <summary>
    /// 最大行数
    /// </summary>
    [ObservableProperty]
    private int _maxRow = 0;

    /// <summary>
    /// 当前文件路径
    /// </summary> 
    private string _currentFilePath;
    public string CurrentFilePath
    {
        get => _currentFilePath;
        set
        {
            SetProperty(ref _currentFilePath, value);
            ReadForExcel(value);
        }
    }

    /// <summary>
    /// Excel文件密码
    /// </summary>
    [ObservableProperty]
    private string _excelPassword;


    [ObservableProperty]
    private string _dbType;

    /// <summary>
    /// 加密连接
    /// </summary>
    [ObservableProperty]
    private bool _isEncrypt;

    [ObservableProperty]
    private string _dbUser;
    [ObservableProperty]
    private string _dbPassword;

    [ObservableProperty]
    private string _dbServer;

    [ObservableProperty]
    private string _dbPort;

    [ObservableProperty]
    private string _dbName;

    [ObservableProperty]
    private string _promptString;
    #endregion
}