using System.Text.Json;
using ClosedXML.Excel;

namespace Kbx.Tests.Scenarios;

/// <summary>Builds an XLSX from the checked-in synthetic JSON fixture. No production spreadsheet is stored in source control.</summary>
public static class KbxSyntheticImportWorkbook
{
    private sealed record Fixture(string Sheet, string[] Columns, JsonElement[][] Rows);

    public static void Build(string jsonPath, string xlsxPath)
    {
        var fixture = JsonSerializer.Deserialize<Fixture>(File.ReadAllText(jsonPath),
            new JsonSerializerOptions { PropertyNameCaseInsensitive = true })
            ?? throw new InvalidOperationException("Invalid synthetic import fixture.");

        using var workbook = new XLWorkbook();
        var sheet = workbook.Worksheets.Add(fixture.Sheet);
        for (var c = 0; c < fixture.Columns.Length; c++)
            sheet.Cell(1, c + 1).Value = fixture.Columns[c];

        for (var r = 0; r < fixture.Rows.Length; r++)
        for (var c = 0; c < fixture.Rows[r].Length; c++)
        {
            var cell = sheet.Cell(r + 2, c + 1);
            var value = fixture.Rows[r][c];
            cell.Value = value.ValueKind switch
            {
                JsonValueKind.Number when value.TryGetDecimal(out var number) => number,
                JsonValueKind.String => value.GetString() ?? string.Empty,
                JsonValueKind.True => true,
                JsonValueKind.False => false,
                _ => value.ToString()
            };
        }
        workbook.SaveAs(xlsxPath);
    }
}
