using System.IO.Compression;
using System.Text;
using FluentAssertions;
using foodmarket.Api.Infrastructure.Invoices;
using Xunit;

namespace foodmarket.UnitTests;

/// <summary>Табличная читалка (xlsx + csv) + <see cref="TableInvoiceParser"/>:
/// порт шаблона накладной из sklad (handoff §7). Генерим xlsx руками (zip + XML),
/// как и в <c>scripts/make_supplier_template.py</c> — так тестируется и наша
/// собственная читалка, и формат, который сдаём поставщикам.</summary>
public class TableReaderTests
{
    private const string M = "http://schemas.openxmlformats.org/spreadsheetml/2006/main";

    private static string WriteXlsx(IEnumerable<IEnumerable<object?>> rows)
    {
        var tmp = Path.Combine(Path.GetTempPath(), $"fm-tr-{Guid.NewGuid():N}.xlsx");
        using var z = new ZipArchive(File.Create(tmp), ZipArchiveMode.Create);

        void Put(string name, string content)
        {
            var e = z.CreateEntry(name);
            using var w = new StreamWriter(e.Open(), new UTF8Encoding(false));
            w.Write(content);
        }

        Put("[Content_Types].xml", $@"<?xml version=""1.0""?>
<Types xmlns=""http://schemas.openxmlformats.org/package/2006/content-types"">
  <Default Extension=""rels"" ContentType=""application/vnd.openxmlformats-package.relationships+xml""/>
  <Default Extension=""xml"" ContentType=""application/xml""/>
  <Override PartName=""/xl/workbook.xml"" ContentType=""application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml""/>
  <Override PartName=""/xl/worksheets/sheet1.xml"" ContentType=""application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml""/>
</Types>");

        Put("_rels/.rels", $@"<?xml version=""1.0""?>
<Relationships xmlns=""http://schemas.openxmlformats.org/package/2006/relationships"">
  <Relationship Id=""rId1"" Type=""http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument"" Target=""xl/workbook.xml""/>
</Relationships>");

        Put("xl/_rels/workbook.xml.rels", $@"<?xml version=""1.0""?>
<Relationships xmlns=""http://schemas.openxmlformats.org/package/2006/relationships"">
  <Relationship Id=""rId1"" Type=""http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet"" Target=""worksheets/sheet1.xml""/>
</Relationships>");

        Put("xl/workbook.xml", $@"<?xml version=""1.0""?>
<workbook xmlns=""{M}"" xmlns:r=""http://schemas.openxmlformats.org/officeDocument/2006/relationships"">
  <sheets><sheet name=""Sheet1"" sheetId=""1"" r:id=""rId1""/></sheets>
</workbook>");

        var sb = new StringBuilder();
        sb.Append($@"<?xml version=""1.0""?><worksheet xmlns=""{M}""><sheetData>");
        int r = 1;
        foreach (var row in rows)
        {
            sb.Append($"<row r=\"{r}\">");
            int c = 0;
            foreach (var v in row)
            {
                var ref1 = $"{(char)('A' + c)}{r}";
                if (v is null) { c++; continue; }
                if (v is string s)
                    sb.Append($"<c r=\"{ref1}\" t=\"inlineStr\"><is><t>{System.Security.SecurityElement.Escape(s)}</t></is></c>");
                else
                    sb.Append($"<c r=\"{ref1}\"><v>{v}</v></c>");
                c++;
            }
            sb.Append("</row>");
            r++;
        }
        sb.Append("</sheetData></worksheet>");
        Put("xl/worksheets/sheet1.xml", sb.ToString());
        return tmp;
    }

    [Fact]
    public void Reads_xlsx_cells()
    {
        var tmp = WriteXlsx(new object?[][]
        {
            new object?[] { "Штрихкод", "Наименование товара", "Количество", "Цена за единицу" },
            new object?[] { "4870001234560", "Молоко 3.2%", 10, 450 },
        });
        try
        {
            var rows = TableReader.Read(tmp);
            rows[0][0].Should().Be("Штрихкод");
            rows[1][2].Should().Be("10");
        }
        finally { File.Delete(tmp); }
    }

    [Fact]
    public void Parses_table_invoice_with_header_rows()
    {
        var tmp = WriteXlsx(new object?[][]
        {
            new object?[] { "Поставщик", "ТОО Пример" },
            new object?[] { "Номер накладной", "7777" },
            new object?[] { "Дата", "2026-10-05" },
            new object?[] { },
            new object?[] { "Штрихкод", "Наименование товара", "Количество", "Ед. изм.", "Цена за единицу", "Сумма" },
            new object?[] { "4870001234560", "Молоко 3.2%", 10, "шт", 450, 4500 },
            new object?[] { "4607031440148", "Хлеб серый", 20, "шт", 180, 3600 },
        });
        try
        {
            var inv = TableInvoiceParser.Parse(tmp, "накладная.xlsx");
            inv.SupplierName.Should().Be("ТОО Пример");
            inv.InvoiceNumber.Should().Be("7777");
            inv.InvoiceDate!.Value.Date.Should().Be(new DateTime(2026, 10, 5));
            inv.Lines.Should().HaveCount(2);
            inv.Lines[0].Barcode.Should().Be("4870001234560");
            inv.Lines[0].Quantity.Should().Be(10);
            inv.Lines[0].Price.Should().Be(450);
            inv.Lines[0].Sum.Should().Be(4500);
            inv.Source.Should().Be("excel");
        }
        finally { File.Delete(tmp); }
    }

    [Fact]
    public void Parses_csv_utf8_with_semicolons()
    {
        var tmp = Path.Combine(Path.GetTempPath(), $"fm-{Guid.NewGuid():N}.csv");
        File.WriteAllText(tmp,
            "Штрихкод;Наименование;Количество;Цена\n" +
            "4870001234560;Молоко 3.2%;10;450\n", new UTF8Encoding(true));   // BOM
        try
        {
            var inv = TableInvoiceParser.Parse(tmp, "накладная.csv");
            inv.Lines.Should().HaveCount(1);
            inv.Lines[0].Barcode.Should().Be("4870001234560");
            inv.Lines[0].Name.Should().Be("Молоко 3.2%");
        }
        finally { File.Delete(tmp); }
    }

    [Fact]
    public void Parses_csv_windows1251()
    {
        // Excel в русской локали сохраняет CSV в 1251 без BOM — читалка должна
        // определить и переключиться на 1251.
        Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
        var enc = Encoding.GetEncoding(1251);
        var tmp = Path.Combine(Path.GetTempPath(), $"fm-{Guid.NewGuid():N}.csv");
        File.WriteAllBytes(tmp, enc.GetBytes(
            "Штрихкод;Наименование;Количество;Цена\n" +
            "4870001234560;Молоко 3.2%;10;450\n"));
        try
        {
            var inv = TableInvoiceParser.Parse(tmp, "накладная.csv");
            inv.Lines.Should().HaveCount(1);
            inv.Lines[0].Name.Should().Be("Молоко 3.2%");
        }
        finally { File.Delete(tmp); }
    }

    [Fact]
    public void Xls_old_format_throws_friendly()
    {
        var tmp = Path.Combine(Path.GetTempPath(), $"fm-{Guid.NewGuid():N}.xls");
        File.WriteAllText(tmp, "stub");
        try
        {
            FluentActions.Invoking(() => TableReader.Read(tmp, "накладная.xls"))
                .Should().Throw<InvoiceExtractionException>()
                .WithMessage("*сохраните файл как .xlsx*");
        }
        finally { File.Delete(tmp); }
    }
}