#nullable enable
using System;
using System.Text;

namespace Terminal.Gui.Drivers;

/// <summary>
/// Fake console output for testing that captures what would be written to the console.
/// </summary>
public class FakeConsoleOutput : OutputBase, IConsoleOutput
{
    private readonly StringBuilder _output = new ();
    private int _cursorLeft;
    private int _cursorTop;
    private Size _windowSize = new (80, 25);

    /// <summary>
    /// Gets the captured output as a string.
    /// </summary>
    public string Output => _output.ToString ();

    /// <summary>
    /// Clears the captured output.
    /// </summary>
    public void ClearOutput () => _output.Clear ();

    /// <inheritdoc/>
    public void SetCursorPosition (int col, int row)
    {
        SetCursorPositionImpl (col, row);
    }

    /// <inheritdoc/>
    protected override bool SetCursorPositionImpl (int col, int row)
    {
        _cursorLeft = col;
        _cursorTop = row;
        return true;
    }

    /// <summary>
    /// Sets the fake window size.
    /// </summary>
    public void SetWindowSize (int width, int height)
    {
        _windowSize = new Size (width, height);
    }

    /// <summary>
    /// Gets the current cursor position.
    /// </summary>
    public (int left, int top) GetCursorPosition () => (_cursorLeft, _cursorTop);

    /// <inheritdoc/>
    public Size GetWindowSize () => _windowSize;

    /// <inheritdoc/>
    public void Write (ReadOnlySpan<char> text)
    {
        _output.Append (text);
    }

    /// <inheritdoc/>
    public override void SetCursorVisibility (CursorVisibility visibility)
    {
        // Capture but don't act on it in fake output
    }

    /// <inheritdoc/>
    public void Dispose ()
    {
        // Nothing to dispose
    }

    /// <inheritdoc/>
    protected override void AppendOrWriteAttribute (StringBuilder output, Attribute attr, TextStyle redrawTextStyle)
    {
        // For testing, we can skip the actual color/style output
        // or capture it if needed for verification
    }

    /// <inheritdoc/>
    protected override void Write (StringBuilder output)
    {
        _output.Append (output);
    }

}