using System;
using System.IO;
using System.Reactive.Linq;
using System.Text.RegularExpressions;
using ReactiveUI;
using Splat;
using StarsAssistant.Helpers;

namespace StarsAssistant.Services;


public partial class CSVDataLoader : IEnableLogger
{
    /// <summary>
    /// Reference to the game metadata, retrieved by DI
    /// </summary>
    protected Services.Game Game = Locator.Current.GetService<Services.Game>()!;

    [GeneratedRegex(@".*\.(?<type>[pf])(?<player>\d)+$")]
    private static partial Regex MyRegex();

    protected Regex FileTypeRegEx = MyRegex();

    public CSVDataLoader() 
    {
        
    }

    public void StartPlanetCSVWatcher() 
    {
        // string[] filters = { "*.p*", "*.f*", "*.map" };

        var watcher = FsWatcher
            .ObserveFileSystem(Game.GamePath, [ Game.PlanetFileSearchPattern ])
            .ThrottleAndDistinct(2, RxApp.TaskpoolScheduler)
            .Log(this, $"{DateTime.Now.ToLongTimeString()} FsEvent", fsEvent => $"{fsEvent.FullPath} {fsEvent.ChangeType}")
            .ObserveOn(RxApp.TaskpoolScheduler);
        
        watcher.Subscribe(fsEvent => this.LoadPlanetFile(fsEvent.FullPath));
    }

    protected void LoadPlanetFile(string fileName)
    {
        Match m = FileTypeRegEx.Match(fileName);
        if (! m.Success)
        {
            this.Log().Error($"Failed to parse {fileName} to identify what we are looking at. Ignoring file.");
            return;
        }

        string type = m.Groups["type"].Value;
        string player = m.Groups["player"].Value;

        this.Log().Debug($"Got file type {type} for player {player}");
        var loader = new CSV.PlanetLoader();
        loader.ImportForRace(Services.Game.Player);
    }
}