using Microsoft.AspNetCore.Mvc;
using Server.WatchBody.Web.Dto;
using Server.WatchBody.Web.Services;

namespace Server.WatchBody.Web.Controllers;

/// <summary>POST /api/v1/sync — приём пакета телефона (spec 03-sync-post).</summary>
public class SyncController : Controller
{
    private readonly SyncService _sync;

    public SyncController(SyncService sync) => _sync = sync;

    public ActionResult Sync()
    {
        int athleteId;
        try
        {
            athleteId = AthleteId();
        }
        catch (InvalidOperationException)
        {
            return Error(401, "unauthorized");
        }

        List<SyncItem> items;
        try
        {
            using var reader = new StreamReader(Request.Body);
            items = SyncItemParser.Parse(reader.ReadToEndAsync().Result);
        }
        catch (SyncException e)
        {
            return Error(e.StatusCode, e.Message);
        }

        try
        {
            var accepted = _sync.Process(athleteId, items);
            return new JsonResult(new SyncResponse { Accepted = accepted });
        }
        catch (SyncException e)
        {
            return Error(e.StatusCode, e.Code);
        }
        catch (Exception e)
        {
            // сбой БД внутри пакета: откат (TransactionScope) + 400, текст — в лог
            Console.Error.WriteLine($"sync error: {e}");
            return Error(400, "sync_failed: " + e.Message);
        }
    }

    private int AthleteId() => (int)HttpContext.Items[Middleware.ApiKeyMiddleware.AthleteIdItem]!;

    private ActionResult Error(int statusCode, string message)
    {
        Response.StatusCode = statusCode;
        return new JsonResult(new ErrorResponse { Error = message });
    }
}