using System.Text.Json;

namespace LehrerApp.Core.Services;

/// <summary>Gewichte für ClassTeacherRosterRow.PatternScore (Klassenlehrer-Bereich, "Gesamtbild")
/// — Default-Werte entsprechen den ursprünglich fest verdrahteten Konstanten.</summary>
public sealed class PatternScoreWeights
{
    public double UnexcusedDayWeight { get; set; } = 3.0;
    public double ExcusedDayWeight { get; set; } = 1.0;
    public double LateDayWeight { get; set; } = 0.5;
    public double NegativeClassRegisterEntryWeight { get; set; } = 1.0;
    public double ConcerningKeywordBonus { get; set; } = 1.5;
    public double SuspensionKeywordWeight { get; set; } = 15.0;
}

/// <summary>Speichert die Gewichte lokal, gleiches Muster wie WorkloadSettingsService/
/// DashboardSettingsService.</summary>
public sealed class PatternScoreSettingsService
{
    private readonly string _configPath;

    public PatternScoreSettingsService(string appDataPath) =>
        _configPath = Path.Combine(appDataPath, "patternscoreweights.json");

    public PatternScoreWeights Load()
    {
        try
        {
            if (File.Exists(_configPath))
                return JsonSerializer.Deserialize<PatternScoreWeights>(File.ReadAllText(_configPath))
                       ?? new PatternScoreWeights();
        }
        catch { /* beschädigte Konfiguration -> Standardgewichte */ }
        return new PatternScoreWeights();
    }

    public void Save(PatternScoreWeights weights) =>
        File.WriteAllText(_configPath, JsonSerializer.Serialize(weights));
}