using System.Text.Json;
using MarketAlly.GitCommitEditor.Models;

namespace MarketAlly.GitCommitEditor.Services;

public sealed class FileStateRepository : IStateRepository
{
    private readonly string _filePath;
    private static readonly JsonSerializerOptions JsonOptions = new() { WriteIndented = true };

    public FileStateRepository(string filePath)
    {
        _filePath = filePath ?? throw new ArgumentNullException(nameof(filePath));
    }

    public async Task<ImproverState> LoadAsync(CancellationToken ct = default)
    {
        if (!File.Exists(_filePath))
            return new ImproverState();

        try
        {
            var json = await File.ReadAllTextAsync(_filePath, ct);
            return JsonSerializer.Deserialize<ImproverState>(json) ?? new ImproverState();
        }
        catch (JsonException)
        {
            return new ImproverState();
        }
        catch (IOException)
        {
            return new ImproverState();
        }
    }

    public async Task SaveAsync(ImproverState state, CancellationToken ct = default)
    {
        // Ensure directory exists
        var directory = Path.GetDirectoryName(_filePath);
        if (!string.IsNullOrEmpty(directory) && !Directory.Exists(directory))
        {
            Directory.CreateDirectory(directory);
        }

        state.LastUpdated = DateTimeOffset.UtcNow;
        var json = JsonSerializer.Serialize(state, JsonOptions);
        await File.WriteAllTextAsync(_filePath, json, ct);
    }
}