using DigitalData.TaskFlow.Application.Features.Documents.Queries.GetDocument;
using DigitalData.TaskFlow.API.Contracts.Common;
using DigitalData.TaskFlow.Domain.Common;
using DigitalData.TaskFlow.Domain.Documents;
using MediatR;
using Microsoft.AspNetCore.Mvc;

namespace DigitalData.TaskFlow.API.Controllers;

/// <summary>
/// Provides document binary download endpoints.
/// </summary>
[ApiController]
[Route("api/documents")]
public sealed class DocumentsController(ISender sender) : ControllerBase
{
    /// <summary>
    /// Returns binary document content by document identifier.
    /// </summary>
    /// <param name="id">Document identifier.</param>
    /// <param name="cancellationToken">Cancellation token.</param>
    /// <returns>Binary stream when available.</returns>
    [HttpGet("{id}")]
    [ProducesResponseType(typeof(FileContentResult), StatusCodes.Status200OK)]
    [ProducesResponseType(typeof(MetaOnlyResponse), StatusCodes.Status400BadRequest)]
    [ProducesResponseType(typeof(MetaOnlyResponse), StatusCodes.Status401Unauthorized)]
    [ProducesResponseType(typeof(MetaOnlyResponse), StatusCodes.Status403Forbidden)]
    [ProducesResponseType(typeof(MetaOnlyResponse), StatusCodes.Status404NotFound)]
    [ProducesResponseType(typeof(MetaOnlyResponse), StatusCodes.Status500InternalServerError)]
    public async Task<IActionResult> GetAsync([FromRoute] string id, CancellationToken cancellationToken)
    {
        var response = await sender.Send(new GetDocumentQuery(id), cancellationToken);
        var data = response.Data ?? throw new InvalidOperationException("Document payload is unexpectedly null.");
        return File(data.Content, data.ContentType, data.FileName);
    }
}