using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using MediatR;
using Host.Models;
using Knot.Shared.Kernel;
using Knot.Modules.Chats.Application.TelegramImport;
using System.Threading;
using System.Threading.Tasks;

namespace Host.Controllers;

[Authorize]
[ApiController]
[Route("api/import/telegram")]
public sealed class TelegramImportController : ControllerBase
{
    private readonly ISender _sender;
    private readonly IUserContext _userContext;

    public TelegramImportController(ISender sender, IUserContext userContext)
    {
        _sender = sender;
        _userContext = userContext;
    }

    [HttpPost("analyze")]
    [DisableRequestSizeLimit]
    [RequestFormLimits(MultipartBodyLengthLimit = 10L * 1024 * 1024 * 1024)] // 10GB for big exports
    public async Task<IActionResult> Analyze(IFormFile file, CancellationToken ct)
    {
        if (file == null)
        {
            return BadRequest("No file uploaded.");
        }

        using var stream = file.OpenReadStream();
        var command = new AnalyzeImportCommand(stream, file.FileName);
        
        var result = await _sender.Send(command, ct);
        
        if (result.IsFailure)
        {
            return BadRequest(result.Error.Description ?? result.Error.Code);
        }

        return Ok(result.Value);
    }

    [HttpPost("execute")]
    public async Task<IActionResult> Execute([FromBody] ExecuteImportRequest req, CancellationToken ct)
    {
        var command = new ExecuteImportCommand(_userContext.UserId, req.Token, req.Mapping, req.GroupName);
        
        var result = await _sender.Send(command, ct);

        if (result.IsFailure)
        {
            return BadRequest(result.Error.Description ?? result.Error.Code);
        }

        return Ok(result.Value);
    }
}