using System.Numerics;
using AcDream.UI.Abstractions;

namespace AcDream.UI.ImGui;

/// <summary>
/// <see cref="IPanelRenderer"/> implemented as thin wrappers around
/// Hexa.NET.ImGui calls. This is the ONLY place where Hexa.NET.ImGui
/// types appear outside of bootstrap / input-bridge plumbing — panels
/// that need a feature must extend the abstraction here, not by importing
/// ImGui in panel files.
/// </summary>
public sealed class ImGuiPanelRenderer : IPanelRenderer
{
    /// <inheritdoc />
    public bool Begin(string title) => Hexa.NET.ImGui.ImGui.Begin(title);

    /// <inheritdoc />
    public void End() => Hexa.NET.ImGui.ImGui.End();

    /// <inheritdoc />
    public void Text(string text) => Hexa.NET.ImGui.ImGui.TextUnformatted(text);

    /// <inheritdoc />
    public void SameLine() => Hexa.NET.ImGui.ImGui.SameLine();

    /// <inheritdoc />
    public void Separator() => Hexa.NET.ImGui.ImGui.Separator();

    /// <inheritdoc />
    public void ProgressBar(float fraction, float width, string? overlay = null)
    {
        // Clamp defensively; ImGui clamps internally but the abstraction
        // contract promises to handle out-of-range values.
        if (fraction < 0f) fraction = 0f;
        else if (fraction > 1f) fraction = 1f;

        var size = new Vector2(width, 0f);   // height 0 → ImGui picks based on font
        Hexa.NET.ImGui.ImGui.ProgressBar(fraction, size, overlay ?? string.Empty);
    }
}