using Microsoft.Xna.Framework;
using MLEM.Extensions;
using MLEM.Ui;
using MLEM.Ui.Elements;
using TouchyTickets.Attractions;

namespace TouchyTickets {
    public class Tutorial {

        private static readonly Step[] Steps = {
            new Step(g => true, "Tutorial1"),
            new Step(g => g.Tickets >= AttractionType.Carousel.InitialPrice, "Tutorial2"),
            new Step(g => g.DrawMap && g.Map.PlacingAttraction?.Type == AttractionType.Carousel, "Tutorial3"),
            new Step(g => g.Map.GetAttractionAmount(AttractionType.Carousel) > 0, "Tutorial4", "Tutorial5", "Tutorial6"),
            new Step(g => g.Tickets >= g.GetStarPrice(), "Tutorial7"),
            new Step(g => g.Stars > 0, "Tutorial8", "Tutorial9")
        };
        public int CurrentStep;
        private int currentStepMessage;

        public void Update(GameImpl game) {
            // stop if the tutorial is finished
            if (this.CurrentStep >= Steps.Length)
                return;
            // don't do anything while a tutorial box is already displaying
            if (game.UiSystem.Get("TutorialBox") != null)
                return;

            var step = Steps[this.CurrentStep];
            if (step.ShouldContinue(game)) {
                var infoBox = new Group(Anchor.TopLeft, Vector2.One, false) {
                    OnDrawn = (e2, time, batch, alpha) => batch.Draw(batch.GetBlankTexture(), e2.DisplayArea, Color.Black * 0.35F)
                };
                var panel = infoBox.AddChild(new Panel(Anchor.Center, new Vector2(0.8F), Vector2.Zero, true));
                panel.AddChild(new Paragraph(Anchor.AutoLeft, 1, Localization.Get(step.Content[this.currentStepMessage])));
                panel.AddChild(new Button(Anchor.AutoLeft, new Vector2(1, 30), Localization.Get("Okay")) {
                    OnPressed = e2 => {
                        game.UiSystem.Remove(e2.Root.Name);
                        this.currentStepMessage++;
                        if (this.currentStepMessage >= step.Content.Length) {
                            this.currentStepMessage = 0;
                            this.CurrentStep++;
                        }
                    }
                });
                game.UiSystem.Add("TutorialBox", infoBox);
            }
        }

        private class Step {

            public readonly ContinueDelegate ShouldContinue;
            public readonly string[] Content;

            public Step(ContinueDelegate shouldContinue, params string[] content) {
                this.ShouldContinue = shouldContinue;
                this.Content = content;
            }

            public delegate bool ContinueDelegate(GameImpl game);

        }

    }
}