Inboxintel/src/InboxIntel.Api/Controllers/ExportController.cs

using InboxIntel.Application.Abstractions;
using Microsoft.AspNetCore.Mvc;

namespace InboxIntel.Api.Controllers;

[Microsoft.AspNetCore.RateLimiting.EnableRateLimiting("expensive")]  // AUDIT H-2: PDF/CSV generation is costly
public class ExportController : ApiControllerBase
{
    private readonly IExportService _export;
    public ExportController(IExportService export) => _export = export;

    /// <summary>Export an inbox report. format = pdf | csv | json.</summary>
    [HttpGet("report")]
    public async Task<IActionResult> Report([FromQuery] string format = "pdf", CancellationToken ct = default)
    {
        var fmt = format.ToLowerInvariant() switch
        {
            "csv" => ExportFormat.Csv,
            "json" => ExportFormat.Json,
            _ => ExportFormat.Pdf
        };
        var (content, contentType, fileName) = await _export.ExportReportAsync(UserId, fmt, ct);
        return File(content, contentType, fileName);
    }
}