using System.Text.Json;
using Duempelkas.App.Services;

namespace Duempelkas.Infrastructure.Services;

public class SettingsService : ISettingsService
{
    private readonly string SettingsPath;

    public SettingsService(string? directory = null) => SettingsPath = Path.Combine(directory ?? Path.Combine(
        Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "Duempelkas"), "settings.json");

    private static readonly JsonSerializerOptions JsonOptions = new() { WriteIndented = true };

    public async Task<bool> GetShowDeletedEntriesAsync() => (await LoadAsync()).ShowDeletedEntries;

    public async Task SetShowDeletedEntriesAsync(bool show)
    {
        var settings = await LoadAsync();
        settings.ShowDeletedEntries = show;
        await SaveAsync(settings);
    }

    public async Task<string?> GetClubNameAsync()
    {
        var settings = await LoadAsync();
        return settings.ClubName;
    }

    public async Task SetClubNameAsync(string? clubName)
    {
        var settings = await LoadAsync();
        settings.ClubName = string.IsNullOrWhiteSpace(clubName) ? null : clubName.Trim();
        await SaveAsync(settings);
    }

    public async Task<int> GetSetupStepAsync() => (await LoadAsync()).SetupStep;
    public async Task SetSetupStepAsync(int step)
    {
        var settings = await LoadAsync();
        settings.SetupStep = Math.Clamp(step, 0, 4);
        await SaveAsync(settings);
    }

    private async Task<AppSettings> LoadAsync()
    {
        if (!File.Exists(SettingsPath))
            return new AppSettings();

        try
        {
            var json = await File.ReadAllTextAsync(SettingsPath);
            return JsonSerializer.Deserialize<AppSettings>(json) ?? new AppSettings();
        }
        catch
        {
            return new AppSettings();
        }
    }

    private async Task SaveAsync(AppSettings settings)
    {
        var dir = Path.GetDirectoryName(SettingsPath)!;
        Directory.CreateDirectory(dir);
        var json = JsonSerializer.Serialize(settings, JsonOptions);
        await File.WriteAllTextAsync(SettingsPath, json);
    }

    private class AppSettings
    {
        public bool ShowDeletedEntries { get; set; }
        public string? ClubName { get; set; }
        public int SetupStep { get; set; }
    }
}