using ClosedXML.Excel;
using JdeScoping.ExcelIO.Templates;
using Shouldly;
using Xunit;

namespace JdeScoping.ExcelIO.Tests.Templates;

public class ExcelTemplateServiceTests
{
    private readonly ExcelTemplateService _service = new();

    [Fact]
    public void GenerateSingleColumn_CreatesValidExcel()
    {
        // Arrange
        var data = new[] { 12345L, 67890L };

        // Act
        var result = _service.GenerateSingleColumn(data, "Work Order Number");

        // Assert
        result.ShouldNotBeNull();
        result.Length.ShouldBeGreaterThan(0);

        // Verify content
        using var stream = new MemoryStream(result);
        using var workbook = new XLWorkbook(stream);
        var worksheet = workbook.Worksheet(1);

        worksheet.Cell(1, 1).GetString().ShouldBe("Work Order Number");
        worksheet.Cell(2, 1).GetString().ShouldBe("12345");
        worksheet.Cell(3, 1).GetString().ShouldBe("67890");
    }

    [Fact]
    public void GenerateMultiColumn_CreatesValidExcel()
    {
        // Arrange
        var data = new[]
        {
            new object?[] { "ITEM-001", "Description 1" },
            new object?[] { "ITEM-002", "Description 2" }
        };
        var headers = new[] { "Item Number", "Description" };

        // Act
        var result = _service.GenerateMultiColumn(data, headers);

        // Assert
        result.ShouldNotBeNull();
        result.Length.ShouldBeGreaterThan(0);

        // Verify content
        using var stream = new MemoryStream(result);
        using var workbook = new XLWorkbook(stream);
        var worksheet = workbook.Worksheet(1);

        worksheet.Cell(1, 1).GetString().ShouldBe("Item Number");
        worksheet.Cell(1, 2).GetString().ShouldBe("Description");
        worksheet.Cell(2, 1).GetString().ShouldBe("ITEM-001");
        worksheet.Cell(2, 2).GetString().ShouldBe("Description 1");
    }

    [Fact]
    public void GenerateSingleColumn_HandlesEmptyData()
    {
        // Act
        var result = _service.GenerateSingleColumn(Array.Empty<string>(), "Header");

        // Assert
        result.ShouldNotBeNull();
        result.Length.ShouldBeGreaterThan(0);
    }

    [Fact]
    public void GenerateMultiColumn_HandlesNullValues()
    {
        // Arrange
        var data = new[]
        {
            new object?[] { "ITEM-001", null }
        };
        var headers = new[] { "Item", "Value" };

        // Act
        var result = _service.GenerateMultiColumn(data, headers);

        // Assert
        result.ShouldNotBeNull();
        using var stream = new MemoryStream(result);
        using var workbook = new XLWorkbook(stream);
        var worksheet = workbook.Worksheet(1);

        worksheet.Cell(2, 2).GetString().ShouldBe(string.Empty);
    }
}