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using NetTopologySuite.Features;
using NetTopologySuite.IO.VectorTiles;
using NetTopologySuite.IO.VectorTiles.Mapbox;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Caching.Memory;
using System.Text.Json;
using Costasdev.Busurbano.Backend.Helpers;
using Costasdev.Busurbano.Backend.Services;
using Costasdev.Busurbano.Backend.Configuration;
using Costasdev.Busurbano.Sources.OpenTripPlannerGql;
using Costasdev.Busurbano.Sources.OpenTripPlannerGql.Queries;
using Microsoft.Extensions.Options;
namespace Costasdev.Busurbano.Backend.Controllers;
[ApiController]
[Route("api/tiles")]
public class TileController : ControllerBase
{
private readonly ILogger<TileController> _logger;
private readonly IMemoryCache _cache;
private readonly HttpClient _httpClient;
private readonly FeedService _feedService;
private readonly AppConfiguration _config;
public TileController(
ILogger<TileController> logger,
IMemoryCache cache,
HttpClient httpClient,
FeedService feedService,
IOptions<AppConfiguration> configOptions
)
{
_logger = logger;
_cache = cache;
_httpClient = httpClient;
_feedService = feedService;
_config = configOptions.Value;
}
[HttpGet("stops/{z:int}/{x:int}/{y:int}")]
public async Task<IActionResult> Stops(int z, int x, int y)
{
if (z is < 9 or > 20)
{
return BadRequest("Zoom level out of range (9-20)");
}
var cacheHit = _cache.TryGetValue($"stops-tile-{z}-{x}-{y}", out byte[]? cachedTile);
if (cacheHit && cachedTile != null)
{
Response.Headers.Append("X-Cache-Hit", "true");
return File(cachedTile, "application/x-protobuf");
}
// Calculate bounding box in EPSG:4326
var n = Math.Pow(2, z);
var lonMin = x / n * 360.0 - 180.0;
var lonMax = (x + 1) / n * 360.0 - 180.0;
var latMaxRad = Math.Atan(Math.Sinh(Math.PI * (1 - 2 * y / n)));
var latMax = latMaxRad * 180.0 / Math.PI;
var latMinRad = Math.Atan(Math.Sinh(Math.PI * (1 - 2 * (y + 1) / n)));
var latMin = latMinRad * 180.0 / Math.PI;
var requestContent = StopTileRequestContent.Query(new StopTileRequestContent.Bbox(lonMin, latMin, lonMax, latMax));
var request = new HttpRequestMessage(HttpMethod.Post, $"{_config.OpenTripPlannerBaseUrl}/gtfs/v1");
request.Content = JsonContent.Create(new GraphClientRequest
{
Query = requestContent
});
var response = await _httpClient.SendAsync(request);
var responseBody = await response.Content.ReadFromJsonAsync<GraphClientResponse<StopTileResponse>>();
if (responseBody is not { IsSuccess: true })
{
_logger.LogError(
"Error fetching stop data, received {StatusCode} {ResponseBody}",
response.StatusCode,
await response.Content.ReadAsStringAsync()
);
return StatusCode(500, "Error fetching stop data");
}
var tileDef = new NetTopologySuite.IO.VectorTiles.Tiles.Tile(x, y, z);
VectorTile vt = new() { TileId = tileDef.Id };
var stopsLayer = new Layer { Name = "stops" };
responseBody.Data?.StopsByBbox?.ForEach(stop =>
{
var idParts = stop.GtfsId.Split(':', 2);
string feedId = idParts[0];
string codeWithinFeed = _feedService.NormalizeStopCode(feedId, stop.Code ?? string.Empty);
if (_feedService.IsStopHidden($"{feedId}:{codeWithinFeed}"))
{
return;
}
// TODO: Duplicate from ArrivalsController
var (Color, TextColor) = _feedService.GetFallbackColourForFeed(idParts[0]);
var distinctRoutes = GetDistinctRoutes(feedId, stop.Routes ?? []);
Feature feature = new()
{
Geometry = new NetTopologySuite.Geometries.Point(stop.Lon, stop.Lat),
Attributes = new AttributesTable
{
// The ID will be used to request the arrivals
{ "id", stop.GtfsId },
// The feed is the first part of the GTFS ID
{ "feed", idParts[0] },
// The public identifier, usually feed:code or feed:id, recognisable by users and in other systems
{ "code", $"{idParts[0]}:{codeWithinFeed}" },
{ "name", _feedService.NormalizeStopName(feedId, stop.Name) },
{ "icon", GetIconNameForFeed(feedId) },
{ "transitKind", GetTransitKind(feedId) },
// Routes
{ "routes", JsonSerializer
.Serialize(
distinctRoutes.Select(r => {
var colour = r.Color ?? Color;
string textColour;
if (r.Color is null) // None is present, use fallback
{
textColour = TextColor;
}
else if (r.TextColor is null || r.TextColor.EndsWith("000000"))
{
// Text colour not provided, or default-black; check the better contrasting
textColour = ContrastHelper.GetBestTextColour(colour);
}
else
{
// Use provided text colour
textColour = r.TextColor;
}
return new {
shortName = r.ShortName,
colour,
textColour
};
}))
}
}
};
stopsLayer.Features.Add(feature);
});
vt.Layers.Add(stopsLayer);
using var ms = new MemoryStream();
vt.Write(ms, minLinealExtent: 1, minPolygonalExtent: 2);
_cache.Set($"stops-tile-{z}-{x}-{y}", ms.ToArray(), TimeSpan.FromMinutes(15));
Response.Headers.Append("X-Cache-Hit", "false");
return File(ms.ToArray(), "application/x-protobuf");
}
private string GetIconNameForFeed(string feedId)
{
return feedId switch
{
"vitrasa" => "stop-vitrasa",
"santiago" => "stop-santiago",
"coruna" => "stop-coruna",
"xunta" => "stop-xunta",
"renfe" => "stop-renfe",
"feve" => "stop-feve",
_ => "stop-generic",
};
}
private string GetTransitKind(string feedId)
{
return feedId switch
{
"vitrasa" or "santiago" or "coruna" => "bus",
"xunta" => "coach",
"renfe" or "feve" => "train",
_ => "unknown",
};
}
private List<StopTileResponse.Route> GetDistinctRoutes(string feedId, List<StopTileResponse.Route> routes)
{
List<StopTileResponse.Route> distinctRoutes = [];
HashSet<string> seen = new();
foreach (var route in routes)
{
var seenId = _feedService.GetUniqueRouteShortName(feedId, route.ShortName ?? string.Empty);
route.ShortName = seenId;
if (seen.Contains(seenId))
{
continue;
}
seen.Add(seenId);
distinctRoutes.Add(route);
}
return [.. distinctRoutes.OrderBy(
r => r.ShortName,
Comparer<string?>.Create(SortingHelper.SortRouteShortNames)
)];
}
}
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