using System.Text;
using Microsoft.Xna.Framework;

namespace FarseerPhysics.SamplesFramework
{
    internal class SimpleDemo4 : PhysicsGameScreen, IDemoScreen
    {
        #region IDemoScreen Members

        public string GetTitle()
        {
            return "Stacked Objects";
        }

        public string GetDetails()
        {
            StringBuilder sb = new StringBuilder();
            sb.AppendLine("This demo shows the stacking stability of the engine.");
            sb.AppendLine("It shows a stack of rectangular bodies stacked in the shape of a pyramid.");
            sb.AppendLine(string.Empty);
            sb.AppendLine("GamePad:");
            sb.AppendLine("  - Rotate agent: left and right triggers");
            sb.AppendLine("  - Move agent: right thumbstick");
            sb.AppendLine("  - Move cursor: left thumbstick");
            sb.AppendLine("  - Grab object (beneath cursor): A button");
            sb.AppendLine("  - Drag grabbed object: left thumbstick");
            sb.AppendLine("  - Exit to menu: Back button");
            sb.AppendLine(string.Empty);
            sb.AppendLine("Keyboard:");
            sb.AppendLine("  - Rotate agent: left and right arrows");
            sb.AppendLine("  - Move agent: A,S,D,W");
            sb.AppendLine("  - Exit to menu: Escape");
            sb.AppendLine(string.Empty);
            sb.AppendLine("Mouse / Touchscreen");
            sb.AppendLine("  - Grab object (beneath cursor): Left click");
            sb.AppendLine("  - Drag grabbed object: move mouse / finger");
            return sb.ToString();
        }

        #endregion

#if XBOX || WINDOWS_PHONE
    //Xbox360 / WP7 can't handle as many geometries
        private const int PyramidBaseBodyCount = 10;
#else
        private const int PyramidBaseBodyCount = 14;
#endif

        private Agent _agent;
        private Pyramid _pyramid;
        private Border _border;

        public override void LoadContent()
        {
            base.LoadContent();

            World.Gravity = new Vector2(0f, 20f);

            _border = new Border(World, this, ScreenManager.GraphicsDevice.Viewport);

            _agent = new Agent(World, this, new Vector2(5f, -10f));

            _pyramid = new Pyramid(World, this, new Vector2(0f, 15f), PyramidBaseBodyCount, 1f);

            SetUserAgent(_agent.Body, 1000f, 400f);
        }

        public override void Draw(GameTime gameTime)
        {
            ScreenManager.SpriteBatch.Begin(0, null, null, null, null, null, Camera.View);
            _agent.Draw();
            _pyramid.Draw();
            ScreenManager.SpriteBatch.End();
            _border.Draw();
            base.Draw(gameTime);
        }
    }
}