using System;
using System.Diagnostics.CodeAnalysis;
using CsvHelper.Configuration;
using CsvHelper;
using System.Globalization;
using Splat;
using StarsAssistant.Services;
using Avalonia.Animation;

namespace StarsAssistant.CSV;

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

    /// <summary>
    /// CSV Configuration to use for importing Planet files.
    /// </summary>
    protected CsvConfiguration CsvConfig;

    /// <summary>
    /// Construction
    /// </summary>
    public FleetLoader()
    {
        CreateConfig();
    }

    /// <summary>
    /// Creates the CSV configuration for planets.
    /// </summary>
    [MemberNotNull(nameof(CsvConfig))]
    protected void CreateConfig() 
    {
        CsvConfig = CsvConfiguration.FromAttributes<Fleet>(CultureInfo.InvariantCulture);
        CsvConfig.Delimiter = "\t";
        CsvConfig.Escape = '\0';
        CsvConfig.MissingFieldFound = null;
    }

    /// <summary>
    /// Import the fleet file for the given Race, all other records will be ignored.
    /// Since we can't update existing records, we will delete all applicable ones
    /// before inserting new Fleets.
    /// </summary>
    /// <param name="race">Import File</param>
    public void ImportForRace(Model.Race race)
    {
        using var db = Locator.Current.GetService<Model.StarsDatabase>()!;
        using var reader = new StreamReader(Game.FleetFileForRace(race), System.Text.Encoding.Latin1);
        using var csv = new CsvReader(reader, CsvConfig);

        var oldFleetsToDelete = from flt in db.Fleet
            where flt.OwnerFileId == race.PlayerFileId
            select flt;
        db.RemoveRange(oldFleetsToDelete);

        List<CSV.Fleet> records = csv.GetRecords<Fleet>().ToList();
        var fleetsForPlayer = from flt in records
            where flt.OwnerFileId == race.PlayerFileId
            select flt;

        foreach (var csvFleet in fleetsForPlayer)
        {
            Model.Fleet dbFleet = new();
            csvFleet.UpdateDbFleet(dbFleet);
            dbFleet.OwnerId = race.Name;
            db.Add(dbFleet);
        }

        db.SaveChanges();
    }

}