using System.Globalization;
using System.Text;
using Gremlin_BlazorServer.Data.EntityClasses;
using Gremlin_BlazorServer.Pages.Quotes;
using NuGet.Packaging;

namespace Gremlin_BlazorServer.Services;

public class QuoteHandling {
    // private static readonly GenericController genericController = new();

    public static async Task<StringBuilder?> CreateTexAsync(Quote quote) {
        StringBuilder? texString = await TexService.CreateTex(quote);
        if (texString is null) return null;

        Console.WriteLine(texString.Length > 0 ? "Creating TexFile succesfully." : "Error during TexFile creation!");
        return texString;
    }

    //FromWindowsGremlin
    private static Quote ReadLineItems(Quote quote, Contact recipient, string clipboard) {
        try {
            quote = ResetTotals(quote);

            quote.LineItems = ReadLineItemsFromClipboard(quote, clipboard);

            quote.QuoteContains3Pp = DoesContains(quote, "3PP");
            quote.QuoteContainsRb = DoesContains(quote, "RB");

            quote.TotalListprice = GetTotal(quote, "TotalListprice");
            quote.TotalDiscount = GetTotal(quote, "AverageDiscount");
            quote.TotalNet = GetTotal(quote, "TotalNet");

            if (recipient.Account.AccountName is not null) quote.ValidFor = CheckForAcademic(recipient.Account);

            foreach (LineItem lineItem in quote.LineItems) {
                if (lineItem.OptionNumber is null or "") break;

                if (lineItem.OptionNumber.StartsWith("8D")) quote.Warranty = int.Parse(lineItem.OptionNumber.Last().ToString()) * 12;
                quote.Warranty = lineItem.OptionNumber switch {
                    "9EC" => 24,
                    "9CC" => 36,
                    _ => quote.Warranty
                };
            }

            quote = CalculateTotals(quote);
            return quote;
        }
        catch (Exception e) {
            Console.WriteLine(e);
            return new();
        }
    }

    private static List<LineItem> ReadLineItemsFromClipboard(Quote quote, string clipboard) {
        //Zeilen aufteilen
        IEnumerable<string> clipboardLines = clipboard.Split(Environment.NewLine.ToCharArray());
        List<string[]> clipboardList = (from clipboardLine in clipboardLines where clipboardLine != "" select clipboardLine.Split('\t')).ToList();
        List<LineItem> lineItems = ParseClipboardList(quote, clipboardList).Result;
        return lineItems;
    }

    private static Task<List<LineItem>> ParseClipboardList(Quote quote, List<string[]> lineItemStrings) {
        List<LineItem> lineItems = new();
        CultureInfo cultureInfoUs = new("en-US");

        foreach (string[] lineItemString in lineItemStrings)
            //Anzahl an Spalten entspricht Clipboard
            if (lineItemString.Length == 19) {
                //Header ignorieren
                if (lineItemString[0] == "#") continue;

                //Dateiinhalt in Klasse schreiben
                LineItem lineItem = new() {
                    Position = ushort.Parse(lineItemString[0]),
                    ProductNumber = lineItemString[1],
                    OptionNumber = lineItemString[2],
                    ProductLine = lineItemString[3],
                    SapShortDescription = lineItemString[4],
                    Amount = ushort.Parse(lineItemString[5]),
                    ListPrice = decimal.Parse(lineItemString[6], cultureInfoUs),
                    TotalDiscount = decimal.Parse(lineItemString[9], cultureInfoUs),
                    NetPrice = decimal.Parse(lineItemString[10], cultureInfoUs),
                    Total = decimal.Parse(lineItemString[11], cultureInfoUs),
                    SalesDiscount = decimal.Parse(lineItemString[12], cultureInfoUs),
                    ContractualDiscount = decimal.Parse(lineItemString[13], cultureInfoUs),
                    PromotionalDiscount = decimal.Parse(lineItemString[14], cultureInfoUs),
                    DemoDiscount = decimal.Parse(lineItemString[15], cultureInfoUs),
                    QuoteId = quote.QuoteId
                };

                lineItems.Add(lineItem);
            }
            else {
                Console.WriteLine("Angebot konnte nicht eingelesen werden!");
            }

        return Task.FromResult(lineItems);
    }

    private static byte CheckForAcademic(Account account) {
        return account.AccountType?.AccountTypeCode == null ? (byte)60 : (byte)(account.AccountType.AccountTypeCode.StartsWith("N") ? 90 : 60);
    }

    private static decimal GetFreight(decimal net, decimal freight) {
        decimal freightNet = net * freight / 100;
        return freightNet < 3000 ? freightNet : 3000;
    }

    private static Quote CalculateTotals(Quote quote) {
        quote.TotalFreightOnly = GetFreight(quote.TotalNet, quote.Freight);
        quote.TotalFreight = quote.TotalNet + quote.TotalFreightOnly;
        quote.TotalVat = quote.TotalFreight * Convert.ToDecimal(quote.Vat) / 100;
        quote.TotalGross = quote.TotalFreight * (100 + Convert.ToDecimal(quote.Vat)) / 100;
        return quote;
    }

    private static Quote ResetTotals(Quote quote) {
        quote.TotalListprice = 0;
        quote.TotalNet = 0;
        quote.TotalFreightOnly = 0;
        quote.TotalFreight = 0;
        quote.TotalVat = 0;
        quote.TotalGross = 0;

        return quote;
    }

    private static decimal GetTotal(Quote quote, string type) {
        decimal total = 0;
        if (quote.LineItems.Count == 0) return total;

        foreach (LineItem lineItem in quote.LineItems)
            switch (type) {
                case "TotalListprice":
                    total += lineItem.ListPrice;
                    break;
                case "TotalNet":
                    total += lineItem.Total;
                    break;
                case "AverageDiscount":
                    total += lineItem.TotalDiscount;
                    break;
            }

        if ((type == "AverageDiscount") & (quote.LineItems.Count != 0)) total /= quote.LineItems.Count;

        return total;
    }

    private static bool DoesContains(Quote quote, string type) {
        if (quote.LineItems is null) return false;

        foreach (LineItem lineItem in quote.LineItems)
            switch (type) {
                case "3PP":
                    if (lineItem.ProductLine == "3PP") {
                        Console.WriteLine($"Quote contains 3PP with ProductNumber {lineItem.ProductNumber}");
                        return true;
                    }

                    break;
                case "RB":
                    if ((lineItem.ProductLine == "RB") & (lineItem.ProductNumber != "R2005A")) {
                        Console.WriteLine($"Quote contains RB with ProductNumber {lineItem.ProductNumber}");
                        return true;
                    }

                    break;
            }

        return false;
    }

    public static async Task<Quote> GenerateQuoteFromString(Quote quote, Contact recipient, string fileContent) {
        quote = ReadLineItems(quote, recipient, fileContent);
        if (recipient.Account.AccountName is not null) quote.Path = HostingService.GetPath(quote, recipient) ?? "Path not found!";
        if (quote.LineItems is null || quote.LineItems.Count == 0) return quote;

        FileService.WriteQuoteToTsv(fileContent, quote);

        //TODO Load all relevant CustomDescriptions upfront
        foreach (LineItem lineItem in quote.LineItems) {
            CustomDescription? newCustomDescription = GenericController.Get<CustomDescription>(newCustomDescription => newCustomDescription.ProductNumber.Equals(lineItem.ProductNumber, StringComparison.Ordinal) && newCustomDescription.OptionNumber!.Equals(lineItem.OptionNumber, StringComparison.Ordinal));
            if (newCustomDescription is null) continue;
            if (lineItem.ProductNumber is null) continue;
            if (newCustomDescription.DescriptionText is null) {
                Console.WriteLine($"Keine CustomDescription für {lineItem.ProductNumber}#{lineItem.OptionNumber} verfügbar!");
                List<CustomDescription> suggestedCustomDescriptions = await SuggestCustomDescriptions(lineItem);
                newCustomDescription = new() { ProductNumber = lineItem.ProductNumber, OptionNumber = lineItem.OptionNumber, Heading = lineItem.SapShortDescription, DescriptionText = lineItem.SapLongDescription };

                //Show windows to edit new cD
                await QuoteAdd.ShowCustomDescriptionModal(suggestedCustomDescriptions);
                //TODO need to wait for modal!

                //Insert new CustomDescription to db
                newCustomDescription.AccountId = 1;
                _ = await GenericController.InsertAsync(newCustomDescription);
            }

            // Product product = await GenericController.GetAsync<Product>(p => p.ProductNumber.Equals(lineItem.ProductNumber) && p.OptionNumber.Equals(lineItem.OptionNumber));
            // lineItem.ProductId = product.ProductId;
            CustomDescription? customDescription = GenericController.Get<CustomDescription>(cD => cD.ProductNumber.Equals(lineItem.ProductNumber) && cD.OptionNumber.Equals(lineItem.OptionNumber));
            if (customDescription is not null) lineItem.CustomDescriptionId = customDescription.CustomDescriptionId;
            // lineItem.QuoteId = quote.QuoteId;
        }

        return quote;
    }

    private static async Task<List<CustomDescription>> SuggestCustomDescriptions(LineItem lineItem) {
        IList<CustomDescription> suggestions = new List<CustomDescription>();
        if (lineItem.ProductNumber is not null)
            suggestions.AddRange(await GenericController.GetAllAsync<CustomDescription>(cD => cD.ProductNumber!.Equals(lineItem.ProductNumber, StringComparison.Ordinal)));
        if (lineItem.OptionNumber is not null)
            suggestions.AddRange(await GenericController.GetAllAsync<CustomDescription>(cD => cD.OptionNumber!.Equals(lineItem.OptionNumber, StringComparison.Ordinal)));
        return suggestions.ToList();
    }
}