using System;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using MLEM.Animations;
using MLEM.Extended.Extensions;
using MLEM.Extensions;
using MLEM.Input;
using MLEM.Startup;
using MLEM.Textures;
using MonoGame.Extended;
using RectangleF = MLEM.Misc.RectangleF;

namespace GreatSpringGameJam {
    public class Player : Entity {

        private static readonly UniformTextureAtlas PlayerTexture = new(MlemGame.LoadContent<Texture2D>("Textures/Player"), 4, 1);

        public RectangleF Bounds => new(this.Position + new Vector2(4 / 16F, 0), new Vector2(9 / 16F, 1));

        private readonly SpriteAnimationGroup animations;
        private bool walking;
        private bool onGround;
        private Vector2 velocity;
        private TimeSpan jumpTime;
        private bool facingRight;
        private HeldItem heldItem;

        public Player(Map map, Vector2 position) : base(map, position) {
            this.animations = new SpriteAnimationGroup();
            this.animations.Add(new SpriteAnimation(0.15F, PlayerTexture[1], PlayerTexture[2], PlayerTexture[3], PlayerTexture[0]), () => this.walking);
            this.animations.Add(new SpriteAnimation(1, PlayerTexture[0]), () => !this.walking);
        }

        public override void Update(GameTime time) {
            base.Update(time);

            // input
            var move = 0F;
            if (MlemGame.Input.IsAnyDown(Keys.A, Keys.Left)) {
                move -= 0.04F;
                this.facingRight = false;
            }
            if (MlemGame.Input.IsAnyDown(Keys.D, Keys.Right)) {
                move += 0.04F;
                this.facingRight = true;
            }
            this.walking = move != 0;
            this.velocity.X += move;

            if (MlemGame.Input.IsAnyDown(Keys.Up, Keys.Space)) {
                // only start jumping if we just started pressing the buttons
                if (this.onGround && MlemGame.Input.IsAnyPressed(Keys.Up, Keys.Space))
                    this.jumpTime = TimeSpan.FromSeconds(0.3F);
                this.jumpTime -= time.ElapsedGameTime;
                if (this.jumpTime > TimeSpan.Zero)
                    this.velocity.Y = -0.15F;
            } else {
                this.jumpTime = TimeSpan.Zero;
            }

            // movement and collisions
            this.Position += this.velocity;
            this.Collide(() => this.Bounds.ToExtended(), ref this.velocity, out this.onGround);
            this.velocity *= new Vector2(this.onGround ? 0.5F : 0.6F, 0.9F);
            this.velocity.Y += 0.02F;

            // item usage
            var rot = this.GetHeldRotation();
            var rotVec = new Vector2(MathF.Cos(rot), MathF.Sin(rot));
            if (MlemGame.Input.IsDown(MouseButton.Left)) {
                this.heldItem = HeldItem.SnowBlower;
                Random.NextUnitVector(out var vel);
                vel = vel * 0.03F + rotVec * 0.13F;
                this.Map.AddEntity(new SnowBlowerWind(this.Map, this.Position + Vector2.One / 2 + rotVec * 0.75F, vel));
            } else if (MlemGame.Input.IsDown(MouseButton.Right)) {
                this.heldItem = HeldItem.WateringCan;
                if (Random.NextSingle() <= 0.45F) {
                    Random.NextUnitVector(out var vel);
                    vel = vel * 0.015F + rotVec * 0.03F;
                    this.Map.AddEntity(new WaterDrop(this.Map, this.Position + Vector2.One / 2 + rotVec * 0.65F, vel));
                }
            }

            this.animations.Update(time);
        }

        public override void Draw(GameTime time, SpriteBatch batch) {
            base.Draw(time, batch);

            // draw self
            var pos = this.Position * this.Map.TileSize;
            var effects = this.facingRight ? SpriteEffects.FlipHorizontally : SpriteEffects.None;
            batch.Draw(this.animations.CurrentRegion, pos, Color.White, 0, Vector2.Zero, 1, effects, 0);

            // draw held item
            var tex = this.heldItem switch {
                HeldItem.SnowBlower => StuffTexture[0, 0],
                HeldItem.WateringCan => StuffTexture[2, 0],
                _ => null
            };
            var origin = new Vector2(tex.Width * 0.25F, tex.Height / 2);
            var rot = this.GetHeldRotation();
            var flip = rot >= MathHelper.PiOver2 && rot <= MathHelper.Pi * 1.5F ? SpriteEffects.FlipVertically : SpriteEffects.None;
            batch.Draw(tex, pos + this.Map.TileSize / 2, Color.White, rot, origin, 1, flip, 0);
        }

        private float GetHeldRotation() {
            var myPos = GameImpl.Instance.Camera.ToCameraPos((this.Position + Vector2.One / 2) * this.Map.TileSize);
            var mousePos = MlemGame.Input.MousePosition.ToVector2();
            var (x, y) = myPos - mousePos;
            return MathF.Atan2(y, x) + MathHelper.Pi;
        }

        private enum HeldItem {

            SnowBlower,
            WateringCan

        }

    }
}