using System.Diagnostics;
using System.IO;
using Azaion.Common.DTO;
using Azaion.Common.DTO.Config;
using Azaion.CommonSecurity;
using Azaion.CommonSecurity.DTO;
using Microsoft.Extensions.Options;

namespace Azaion.Common.Services;

public interface IGpsMatcherService
{
    Task RunGpsMatching(string userRouteDir, double initialLatitude, double initialLongitude, Func<GpsMatchResult, Task> processResult, CancellationToken detectToken = default);
    void StopGpsMatching();
}

public class GpsMatcherService(IGpsMatcherClient gpsMatcherClient, ISatelliteDownloader satelliteTileDownloader, IOptions<DirectoriesConfig> dirConfig) : IGpsMatcherService
{
    private const int ZOOM_LEVEL = 18;
    private const int POINTS_COUNT = 10;
    private const int DISTANCE_BETWEEN_POINTS_M = 100;
    private const double SATELLITE_RADIUS_M = DISTANCE_BETWEEN_POINTS_M * (POINTS_COUNT + 1);

    public async Task RunGpsMatching(string userRouteDir, double initialLatitude, double initialLongitude, Func<GpsMatchResult, Task> processResult, CancellationToken detectToken = default)
    {
        var currentLat = initialLatitude;
        var currentLon = initialLongitude;

        var routeDir = Path.Combine(SecurityConstants.EXTERNAL_GPS_DENIED_FOLDER, dirConfig.Value.GpsRouteDirectory);
        if (Directory.Exists(routeDir))
             Directory.Delete(routeDir, true);
        Directory.CreateDirectory(routeDir);

        var routeFiles = new List<string>();
        foreach (var file in Directory.GetFiles(userRouteDir))
        {
            routeFiles.Add(file);
            File.Copy(file, Path.Combine(routeDir, Path.GetFileName(file)));
        }

        var indexOffset = 0;
        while (routeFiles.Any())
        {
            await satelliteTileDownloader.GetTiles(currentLat, currentLon, SATELLITE_RADIUS_M, ZOOM_LEVEL, detectToken);
            gpsMatcherClient.StartMatching(new StartMatchingEvent
            {
                ImagesCount = POINTS_COUNT,
                Latitude = initialLatitude,
                Longitude = initialLongitude,
                SatelliteImagesDir = dirConfig.Value.GpsSatDirectory,
                RouteDir = dirConfig.Value.GpsRouteDirectory
            });

            while (true)
            {
                var result = gpsMatcherClient.GetResult();
                if (result == null)
                    break;
                result.Index += indexOffset;
                await processResult(result);
                currentLat = result.Latitude;
                currentLon = result.Longitude;
                routeFiles.RemoveAt(0);
            }
            indexOffset += POINTS_COUNT;
        }
    }

    public void StopGpsMatching()
    {
        gpsMatcherClient.Stop();
    }
}