using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text.RegularExpressions;
using Assets.PixelHeroes.Scripts.CharacterScripts;
using Assets.PixelHeroes.Scripts.CollectionScripts;
using UnityEngine;
using UnityEngine.UI;

#if UNITY_EDITOR

using UnityEditor;

#endif

namespace Assets.PixelHeroes.Scripts.EditorScripts
{
    public class CharacterEditor : MonoBehaviour
    {
        public SpriteCollection SpriteCollection;
        public List<LayerEditor> Layers;
        public CharacterBuilder CharacterBuilder;
        public Sprite EmptyIcon;

        public static event Action<string> SliceTextureRequest = path => {};
        public static event Action<string> CreateSpriteLibraryRequest = path => { };

        public void Start()
        {
            foreach (var layer in Layers)
            {
                if (layer.Controls)
                {
                    if (layer.Default != "")
                    {
                        layer.Index = SpriteCollection.Layers.Single(i => i.Name == layer.Name).Textures.FindIndex(i => i.name == layer.Default);
                    }

                    layer.Content = SpriteCollection.Layers.Single(i => i.Name == layer.Name);
                    layer.Controls.Dropdown.options = new List<Dropdown.OptionData>();

                    if (layer.CanBeEmpty) layer.Controls.Dropdown.options.Add(new Dropdown.OptionData("Empty", EmptyIcon));

                    layer.Controls.Dropdown.options.AddRange(layer.Content.Textures.Select(i => new Dropdown.OptionData(GetDisplayName(i.name), Sprite.Create(layer.Content.GetIcon(i), new Rect(0, 0, 16, 16), Vector2.one / 2, 100))));
                    layer.Controls.Dropdown.value = -1;
                    layer.Controls.Dropdown.value = layer.Index + (layer.CanBeEmpty ? 1 : 0);
                    layer.Controls.Dropdown.onValueChanged.AddListener(value => SetIndex(layer, value));
                    layer.Controls.Prev.onClick.AddListener(() => Switch(layer, -1));
                    layer.Controls.Next.onClick.AddListener(() => Switch(layer, +1));
                    layer.Controls.Hide.onClick.AddListener(() => Hide(layer));
                    layer.Controls.Paint.onClick.AddListener(() => Paint(layer));
                    layer.Controls.Hue.onValueChanged.AddListener(value => Rebuild(layer));
                    layer.Controls.Saturation.onValueChanged.AddListener(value => Rebuild(layer));
                    layer.Controls.Brightness.onValueChanged.AddListener(value => Rebuild(layer));
                    layer.Controls.OnSelectFixedColor = color => { layer.Color = color; Rebuild(layer); };
                }
            }

            Rebuild(null);
        }

        public void Rebuild()
        {
            Rebuild(null);
        }

        public void Hide(LayerEditor layer)
        {
            layer.Hidden = !layer.Hidden;
            Rebuild(layer);
        }

        public void Paint(LayerEditor layer)
        {
            #if UNITY_EDITOR

            ColorPicker.Open(layer.Color);
            ColorPicker.OnColorPicked = color =>
            {
                layer.Color = color;
                Rebuild(layer);
            };

            #endif
        }

        public void Preset(string preset)
        {
            foreach (var layerName in new[] { "Head", "Ears", "Eyes", "Body", "Horns" })
            {
                var layer = Layers.Single(i => i.Name == layerName);
                var dropdown = layer.Controls.Dropdown;

                layer.Color = Color.white;
                dropdown.value = dropdown.options.FindIndex(i => i.text == GetDisplayName(preset));
            }

            Layers.Single(i => i.Name == "Hair").Controls.Dropdown.value = 0;
        }

        private void Switch(LayerEditor layer, int direction)
        {
            layer.Switch(direction);
            Rebuild(layer);
        }

        private void SetIndex(LayerEditor layer, int index)
        {
            if (layer.CanBeEmpty) index--;

            layer.SetIndex(index);

            if (layer.Name == "Body")
            {
                Layers.Single(i => i.Name == "Head").SetIndex(index);
                Layers.Single(i => i.Name == "Ears").SetIndex(index);
            }

            Rebuild(layer);
        }

        private void Rebuild(LayerEditor layer)
        {
            var layers = Layers.ToDictionary(i => i.Name, i => i.SpriteData);

            CharacterBuilder.Head = layers["Head"];
            CharacterBuilder.Ears = layers["Ears"];
            CharacterBuilder.Eyes = layers["Eyes"];
            CharacterBuilder.Body = layers["Body"];
            CharacterBuilder.Hair = layers["Hair"];
            CharacterBuilder.Armor = layers["Armor"];
            CharacterBuilder.Helmet = layers["Helmet"];
            CharacterBuilder.Weapon = layers["Weapon"];
            CharacterBuilder.Shield = layers["Shield"];
            CharacterBuilder.Cape = layers["Cape"];
            CharacterBuilder.Back = layers["Back"];
            CharacterBuilder.Mask = layers["Mask"];
            CharacterBuilder.Horns = layers["Horns"];
            CharacterBuilder.Rebuild(layer?.Name);
        }

        private static string GetDisplayName(string fileName)
        {
            var displayName = Regex.Replace(fileName, @"\[\w+\]", "");

            displayName = Regex.Replace(displayName, "([a-z])([A-Z])", "$1 $2");

            return displayName.Trim();
        }

        public void Save()
        {
            string path = null;

            #if UNITY_EDITOR

            path = EditorUtility.SaveFilePanel("Save as PNG", Application.dataPath, "SpriteSheet.png", "png");

            #elif UNITY_WEBGL

            UI.Popup.Instance.Show("This feature is unavailable in the demo version. Please purchase the full app.");

            #endif

            if (string.IsNullOrEmpty(path)) return;

            File.WriteAllBytes(path, CharacterBuilder.Texture.EncodeToPNG());

            #if UNITY_EDITOR
            
            if (path.StartsWith(Application.dataPath))
            {
                path = "Assets" + path.Substring(Application.dataPath.Length);
                AssetDatabase.Refresh();
                SliceTextureRequest(path);

                if (EditorUtility.DisplayDialog("Success", $"Texture saved and sliced:\n{path}\n\nDo you want to create Sprite Library Asset for it?", "Yes", "No"))
                {
                    CreateSpriteLibraryRequest(path);
                }
            }
            else
            {
                EditorUtility.DisplayDialog("Success", $"Texture saved:\n{path}\n\nTip: textures are automatically sliced when saving to Assets.", "OK");
            }

            #endif
        }
    }
}