using Rhino.Geometry;

namespace RhMcp.Tools;

[McpServerToolType]
public static class SetCameraTool
{
    [McpServerTool("set_camera", "Set Camera", false, false)]
    [Description("Set the active viewport camera. Any subset of position, target, up vector, lens length, projection, or framing bounding-box may be supplied.")]
    public static string SetCamera(
        RhinoDoc doc,
        [Description("Camera position {x,y,z}")] Vector3d? location = null,
        [Description("Camera look-at point {x,y,z}")] Vector3d? target = null,
        [Description("Camera up vector {x,y,z}")] Vector3d? up = null,
        [Description("35mm-equivalent lens length (perspective only)")] double? lensLength = null,
        [Description("Projection: 'parallel' or 'perspective'")] string? projection = null,
        [Description("Frame this bounding box (min corner). Pair with boxMax. Applied last so it dominates location/target if both supplied.")] Vector3d? boxMin = null,
        [Description("Frame this bounding box (max corner). Pair with boxMin.")] Vector3d? boxMax = null)
    {
        var view = doc.Views.ActiveView
            ?? throw new InvalidOperationException("No active view.");

        var vp = view.ActiveViewport;

        if (!string.IsNullOrEmpty(projection))
        {
            if (projection.Equals("parallel", StringComparison.OrdinalIgnoreCase))
                vp.ChangeToParallelProjection(true);
            else if (projection.Equals("perspective", StringComparison.OrdinalIgnoreCase))
                vp.ChangeToPerspectiveProjection(true, vp.Camera35mmLensLength > 0 ? vp.Camera35mmLensLength : 50.0);
            else
                return $"Unknown projection: {projection}";
        }

        if (location is not null)
            vp.SetCameraLocation((Point3d)location, false);

        if (target is not null)
            vp.SetCameraTarget((Point3d)target, false);

        if (up is not null)
            vp.CameraUp = (Vector3d)up;

        if (lensLength.HasValue)
            vp.Camera35mmLensLength = lensLength.Value;

        if (boxMin is not null && boxMax is not null)
        {
            var bb = new BoundingBox((Point3d)boxMin, (Point3d)boxMax);
            if (bb.IsValid)
                vp.ZoomBoundingBox(bb);
            else
                return "boxMin/boxMax do not form a valid bounding box.";
        }

        view.Redraw();

        return "Camera updated.";
    }
}