using System.Text;

namespace OECS.PlayTest;

/// <summary>
/// Builds a sectioned play log with header, sections, and final snapshot,
/// then saves it to a .playlog file.
/// </summary>
public class PlayLog
{
    public string Header { get; set; } = "";
    public string FinalSnapshot { get; set; } = "";

    private readonly List<(string Title, List<string> Lines)> _sections = new();

    /// <summary>
    /// Adds a section with the given title and lines.
    /// </summary>
    public void AddSection(string title, IEnumerable<string> lines)
    {
        _sections.Add((title, lines.ToList()));
    }

    /// <summary>
    /// Builds the complete play log text.
    /// </summary>
    public string Build()
    {
        var sb = new StringBuilder();
        sb.AppendLine(Header);
        sb.AppendLine(new string('=', Header.Length));
        sb.AppendLine();
        foreach (var (title, lines) in _sections)
        {
            sb.AppendLine($"--- {title} ---");
            foreach (var line in lines)
                sb.AppendLine($"  {line}");
            sb.AppendLine();
        }
        sb.AppendLine("--- Final State ---");
        sb.AppendLine(FinalSnapshot);
        return sb.ToString();
    }

    /// <summary>
    /// Saves the play log to AppContext.BaseDirectory/playlogs/<paramref name="filename"/>
    /// and returns the full path.
    /// </summary>
    public string SaveTo(string filename)
    {
        var dir = Path.Combine(AppContext.BaseDirectory, "playlogs");
        Directory.CreateDirectory(dir);
        var path = Path.Combine(dir, filename);
        File.WriteAllText(path, Build());
        return path;
    }
}