using Comal.Classes;
using CsvHelper.Configuration.Attributes;
using CsvHelper.Configuration;
using CsvHelper;
using InABox.Core.Postable;
using InABox.Core;
using InABox.Poster.Timberline;
using InABox.Scripting;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using Microsoft.Win32;
using CsvHelper.TypeConversion;
using NPOI.SS.Formula.Functions;
using Columns = InABox.Core.Columns;

namespace PRS.Shared;

public interface IStockMovementTimberlineLine
{
    DateTime TransactionDate { get; set; }

    DateTime AccountingDate { get; set; }

    string Description { get; set; }

    double Amount { get; set; }

    string DebitAccount { get; set; }

    string CreditAccount { get; set; }

    string Reference1 { get; set; }

    string Reference2 { get; set; }
}

public enum StockMovementTimberlineTransactionType
{
    APCost = 1,
    JCCost = 2,
    PRCost = 3,
    EQCost = 4,
    IVCost = 5
}

public class StockMovementTimberlineTransactionTypeConverter : DefaultTypeConverter
{
    public override object? ConvertFromString(string? text, IReaderRow row, MemberMapData memberMapData)
    {
        if (Enum.TryParse<StockMovementTimberlineTransactionType>(text, out var type))
        {
            return type;
        }
        return base.ConvertFromString(text, row, memberMapData);
    }

    public override string? ConvertToString(object? value, IWriterRow row, MemberMapData memberMapData)
    {
        if (value is StockMovementTimberlineTransactionType type)
        {
            return ((int)type).ToString();
        }
        return "";
    }
}

public class StockMovementTimberlineDirectCost : IStockMovementTimberlineLine
{
    [Ignore]
    public StockMovementBatchType BatchType { get; set; }

    [Index(0)]
    public string RecordID { get; set; } = "DC";

    [Index(1)]
    [TypeConverter(typeof(TimberlinePosterStringConverter), 10)]
    public string Job { get; set; }

    [Index(2)]
    [TypeConverter(typeof(TimberlinePosterStringConverter), 10)]
    public string Extra { get; set; }

    [Index(3)]
    [TypeConverter(typeof(TimberlinePosterStringConverter), 12)]
    public string CostCode { get; set; }

    [Index(4)]
    [TypeConverter(typeof(TimberlinePosterStringConverter), 3)]
    public string Category { get; set; }

    [Index(5)]
    [TypeConverter(typeof(StockMovementTimberlineTransactionTypeConverter))]
    public StockMovementTimberlineTransactionType TransactionType { get; set; }

    [Index(6)]
    [TypeConverter(typeof(TimberlinePosterDateConverter))]
    public DateTime TransactionDate { get; set; }

    [Index(7)]
    [TypeConverter(typeof(TimberlinePosterDateConverter))]
    public DateTime AccountingDate { get; set; }

    [Index(8)]
    [TypeConverter(typeof(TimberlinePosterStringConverter), 30)]
    public string Description { get; set; }

    [Index(9)]
    public double Units { get; set; }

    [Index(10)]
    public double UnitCost { get; set; }

    [Index(11)]
    public double Amount { get; set; }

    [Index(12)]
    [TypeConverter(typeof(TimberlinePosterStringConverter), 25)]
    public string DebitAccount { get; set; }

    [Index(13)]
    [TypeConverter(typeof(TimberlinePosterStringConverter), 25)]
    public string CreditAccount { get; set; }

    [Index(14)]
    [TypeConverter(typeof(TimberlinePosterStringConverter), 10)]
    public string Reference1 { get; set; }

    [Index(15)]
    [TypeConverter(typeof(TimberlinePosterStringConverter), 10)]
    public string Reference2 { get; set; }

    [Index(16)]
    [TypeConverter(typeof(TimberlinePosterStringConverter), 10)]
    public string StandardItem { get; set; }
}

public class StockMovementTimberlineGL : IStockMovementTimberlineLine
{
    [Ignore]
    public StockMovementBatchType BatchType { get; set; }

    [Index(0)]
    public string RecordID { get; set; } = "GL";

    [Index(1)]
    [TypeConverter(typeof(TimberlinePosterDateConverter))]
    public DateTime TransactionDate { get; set; }

    [Index(2)]
    [TypeConverter(typeof(TimberlinePosterDateConverter))]
    public DateTime AccountingDate { get; set; }

    [Index(3)]
    [TypeConverter(typeof(TimberlinePosterStringConverter), 30)]
    public string Description { get; set; }

    [Index(4)]
    public double Amount { get; set; }

    [Index(5)]
    [TypeConverter(typeof(TimberlinePosterStringConverter), 25)]
    public string DebitAccount { get; set; }

    [Index(6)]
    [TypeConverter(typeof(TimberlinePosterStringConverter), 25)]
    public string CreditAccount { get; set; }

    [Index(7)]
    [TypeConverter(typeof(TimberlinePosterStringConverter), 10)]
    public string Reference1 { get; set; }

    [Index(8)]
    [TypeConverter(typeof(TimberlinePosterStringConverter), 10)]
    public string Reference2 { get; set; }
}

public class StockMovementTimberlineSettings : TimberlinePosterSettings<StockMovement>
{
    [TextBoxEditor]
    public string StockTakeGL { get; set; }

    protected override string DefaultScript()
    {
        return @"
using PRS.Shared;
using InABox.Core;
using System.Collections.Generic;

public class Module
{
    public void BeforePost(IDataModel<StockMovement> model)
    {
        // Perform pre-processing
    }

    public bool ProcessDirectCostLine(IDataModel<StockMovement> model, StockMovement stockMovement, StockMovementTimberlineDirectCost line)
    {
        // Do extra processing for a direct cost line; return false to fail this movement
        return true;
    }

    public bool ProcessGLLine(IDataModel<StockMovement> model, StockMovement stockMovement, StockMovementTimberlineGL line)
    {
        // Do extra processing for a GL line; return false to fail this movement
        return true;
    }

    public void AfterPost(IDataModel<StockMovement> model)
    {
        // Perform post-processing
    }
}";
    }
}

public class StockMovementTimberlineResult : TimberlinePostResult<IStockMovementTimberlineLine, StockMovement>
{
}

public class StockMovementTimberlinePoster : ITimberlinePoster<StockMovement, StockMovementTimberlineSettings>
{
    public ScriptDocument? Script { get; set; }
    public StockMovementTimberlineSettings Settings { get; set; }

    public bool BeforePost(IDataModel<StockMovement> model)
    {
        model.SetIsDefault<Document>(false, alias: "CompanyLogo");
        model.SetIsDefault<CoreTable>(false, alias: "CompanyInformation");
        model.SetIsDefault<Employee>(false);

        model.SetColumns(Columns.None<StockMovement>().Add(x => x.ID).Add(x => x.Transaction));

        model.AddChildTable<StockMovement, StockMovement>(x => x.Transaction, x => x.Transaction,
            parentalias: "StockMovement", childalias: "FullTransactions",
            isdefault: true,
            columns: Columns.None<StockMovement>().Add(x => x.ID)
                .Add(x => x.Transaction)
                .Add(x => x.Job.ID)
                .Add(x => x.Product.ID)
                .Add(x => x.Type)
                .Add(x => x.Units)
                .Add(x => x.Cost)
                .Add(x => x.Value)
                .Add(x => x.Date)
                .Add(x => x.Batch.ID)
                );

        model.AddLookupTable<StockMovement, Product>(x => x.Product.ID, x => x.ID, sourcealias: "FullTransactions",
            isdefault: true,
            columns: Columns.None<Product>().Add(x => x.ID)
                .Add(x => x.Name)
                .Add(x => x.CostCentre.Code)
                .Add(x => x.PurchaseGL.Code));

        model.AddLookupTable<StockMovement, Job>(x => x.Job.ID, x => x.ID, sourcealias: "FullTransactions",
            isdefault: true,
            columns: Columns.None<Job>().Add(x => x.ID)
                .Add(x => x.JobNumber));

        Script?.Execute(methodname: "BeforePost", parameters: new object[] { model });
        return true;
    }

    private bool ProcessDirectCostLine(IDataModel<StockMovement> model, StockMovement stockMovement, StockMovementTimberlineDirectCost line)
    {
        return Script?.Execute(methodname: "ProcessDirectCostLine", parameters: new object[] { model, stockMovement, line }) != false;
    }
    private bool ProcessGLLine(IDataModel<StockMovement> model, StockMovement stockMovement, StockMovementTimberlineGL line)
    {
        return Script?.Execute(methodname: "ProcessGLLine", parameters: new object[] { model, stockMovement, line }) != false;
    }

    private StockMovementTimberlineResult DoProcess(IDataModel<StockMovement> model)
    {
        var result = new StockMovementTimberlineResult();

        var firstMovements = model.GetTable<StockMovement>();
        var full = model.GetTable<StockMovement>("FullTransactions")
            .ToObjects<StockMovement>().GroupBy(x => x.Transaction);
        var products = model.GetTable<Product>().ToObjects<Product>()
            .ToDictionary(x => x.ID, x => x);
        var jobs = model.GetTable<Job>().ToObjects<Job>()
            .ToDictionary(x => x.ID, x => x);

        StockMovementTimberlineDirectCost CreateDirectCost(StockMovement movement)
        {
            var job = jobs[movement.Job.ID];
            var product = products[movement.Product.ID];

            var directCost = new StockMovementTimberlineDirectCost
            {
                Job = job.JobNumber,
                Extra = "",
                CostCode = product.CostCentre.Code,
                Category = "",
                Units = Math.Round(movement.Units, 4),
                UnitCost = Math.Round(movement.Cost, 4),
                TransactionType = StockMovementTimberlineTransactionType.IVCost
            };
            return ModifyLine(directCost, movement);
        }
        T ModifyLine<T>(T line, StockMovement movement)
            where T : IStockMovementTimberlineLine
        {
            var product = products[movement.Product.ID];

            line.TransactionDate = movement.Date;
            line.AccountingDate = movement.Date;
            line.Description = product.Name;
            line.Amount = Math.Round(movement.Value, 4);
            line.CreditAccount = product.PurchaseGL.Code;
            line.DebitAccount = product.SellGL.Code;
            return line;
        }

        foreach (var transaction in full)
        {
            var mvts = transaction.ToArray();

            // I think we will fail all the movements if any one movement in the transaction failed. All the successful ones,
            // rather than saving them with AddSuccess immediately, we will put here first, and only succeed them if every movement succeeded.
            var successful = new List<(StockMovement mvt, IStockMovementTimberlineLine? line)>();
            foreach(var mvt in mvts)
            {
                switch (mvt.Type)
                {
                    case StockMovementType.Issue:
                        if(mvt.Job.ID == Guid.Empty)
                        {
                            // Issue to General Stock
                            var gl = new StockMovementTimberlineGL { };
                            gl = ModifyLine(gl, mvt);
                            gl.DebitAccount = Settings.StockTakeGL;
                            if (ProcessGLLine(model, mvt, gl))
                            {
                                successful.Add((mvt, gl));
                            }
                            else
                            {
                                result.AddFailed(mvt, "Failed by script.");
                            }
                        }
                        else
                        {
                            // Ignore issues to a job.
                            successful.Add((mvt, null));
                        }
                        break;
                    case StockMovementType.Receive:
                        successful.Add((mvt, null));
                        break;
                    case StockMovementType.StockTake:
                        if(mvt.Job.ID == Guid.Empty)
                        {
                            // StockTake in General Stock
                            var gl = new StockMovementTimberlineGL { };
                            gl = ModifyLine(gl, mvt);
                            gl.DebitAccount = Settings.StockTakeGL;
                            if (ProcessGLLine(model, mvt, gl))
                            {
                                successful.Add((mvt, gl));
                            }
                            else
                            {
                                result.AddFailed(mvt, "Failed by script.");
                            }
                        }
                        else
                        {
                            // StockTake in Job Holding
                            var dc = CreateDirectCost(mvt);
                            if (ProcessDirectCostLine(model, mvt, dc))
                            {
                                successful.Add((mvt, dc));
                            }
                            else
                            {
                                result.AddFailed(mvt, "Failed by script.");
                            }
                        }
                        break;
                    case StockMovementType.TransferOut:
                    case StockMovementType.TransferIn:
                        if(mvt.Job.ID != Guid.Empty)
                        {
                            var directCost = CreateDirectCost(mvt);
                            if(ProcessDirectCostLine(model, mvt, directCost))
                            {
                                successful.Add((mvt, directCost));
                            }
                            else
                            {
                                result.AddFailed(mvt, "Failed by script.");
                            }
                        }
                        break;
                }
            }

            if(successful.Count < mvts.Length)
            {
                foreach(var (mvt, _) in successful)
                {
                    result.AddFailed(mvt, "Transaction was unsuccessful.");
                }
            }
            else
            {
                foreach(var (mvt, item) in successful)
                {
                    result.AddSuccess(mvt, item);
                }
            }
        }

        return result;
    }

    public IPostResult<StockMovement> Process(IDataModel<StockMovement> model)
    {
        var result = DoProcess(model);

        var dlg = new SaveFileDialog()
        {
            Title = "Select Output File",
            Filter = "CSV Files (*.csv)|*.csv"
        };

        if (dlg.ShowDialog() == true)
        {
            using (var writer = new StreamWriter(dlg.FileName))
            {
                using var csv = new CsvWriter(writer, CultureInfo.InvariantCulture);
                foreach (var line in result.Exports.Distinct())
                {
                    // Write the record.
                    if(line is StockMovementTimberlineDirectCost dc)
                    {
                        csv.WriteRecord(dc);
                    }
                    else if(line is StockMovementTimberlineGL gl)
                    {
                        csv.WriteRecord(gl);
                    }
                    csv.NextRecord();
                }
            }
        }
        else
        {
            throw new PostCancelledException();
        }

        return result;
    }
    public void AfterPost(IDataModel<StockMovement> model, IPostResult<StockMovement> result)
    {
        Script?.Execute(methodname: "AfterPost", parameters: new object[] { model });
    }
}

public class StockMovementTimberlinePosterEngine<T> : TimberlinePosterEngine<StockMovement, StockMovementTimberlineSettings>
{
}