using System;
using System.Collections.Generic;
using System.Numerics;
using Coroutine;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using MLEM.Font;
using MLEM.Startup;
using MLEM.Textures;
using MLEM.Ui;
using MLEM.Ui.Elements;

namespace ThemeParkClicker {
    public class Ui {

        public static readonly UniformTextureAtlas Texture = new UniformTextureAtlas(MlemGame.LoadContent<Texture2D>("Textures/Ui"), 16, 16);

        public Ui(UiSystem uiSystem) {
            uiSystem.GlobalScale = 4;
            uiSystem.AutoScaleWithScreen = true;
            uiSystem.AutoScaleReferenceSize = new Point(720, 1280);
            uiSystem.Style.Font = new GenericSpriteFont(MlemGame.LoadContent<SpriteFont>("Fonts/Regular"));
            uiSystem.Style.TextScale = 0.1F;

            // ticket store ui
            var rainingTickets = new List<RainingTicket>();
            Group ticketStoreUi = new Group(Anchor.TopLeft, Vector2.One, false) {
                OnUpdated = (e, time) => {
                    for (var i = rainingTickets.Count - 1; i >= 0; i--) {
                        if (rainingTickets[i].Update())
                            rainingTickets.RemoveAt(i);
                    }
                    while (rainingTickets.Count < BigInteger.Min(GameImpl.Instance.Tickets / 100, 500))
                        rainingTickets.Add(new RainingTicket());
                },
                OnDrawn = (e, time, batch, alpha) => {
                    foreach (var ticket in rainingTickets)
                        ticket.Draw(batch, e.DisplayArea.Size, e.Scale);
                }
            };
            ticketStoreUi.AddChild(new Paragraph(Anchor.AutoCenter, 1, p => GameImpl.Instance.DisplayTicketCount(), true) {
                TextScale = 0.3F
            });
            var storeGroup = ticketStoreUi.AddChild(new CustomDrawGroup(Anchor.AutoLeft, Vector2.One));
            storeGroup.AddChild(new Image(Anchor.TopLeft, Vector2.One, Texture[0, 0, 2, 3]) {
                OnPressed = e => {
                    GameImpl.Instance.Tickets++;
                    CoroutineHandler.Start(WobbleElement(storeGroup));
                },
                CanBeSelected = true,
                CanBeMoused = true
            });
            ticketStoreUi.OnAreaUpdated += e => storeGroup.Size = new Vector2(e.DisplayArea.Width / e.Scale);
            uiSystem.Add("TicketStore", ticketStoreUi);
        }

        private static IEnumerator<IWait> WobbleElement(CustomDrawGroup element, float intensity = 0.01F) {
            var sin = 0F;
            while (sin < MathHelper.Pi) {
                element.ScaleOrigin(1 + (float) Math.Sin(sin) * intensity * element.Scale);
                sin += 0.2F;
                yield return new WaitEvent(CoroutineEvents.Update);
            }
            element.Transform = Matrix.Identity;
        }

    }
}